JP2009268269A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller of a motor which relatively rotates first and second rotors magnetized to each other to change a phase expressing a relative rotation angle between both rotors, and allows the phase to be fixable at a predetermined position. <P>SOLUTION: The motor 10 includes: first and second operating chambers 54d, 54e which are demarcated by six partition walls 54a fixed to one of the first and second rotors 42a, 42b and protruded in the radial direction, and vanes 52a fixed to the other of the rotors and protruded in the radial direction, and are sealed by abutting sealing members 54c mounted on the tips of the partition walls 54a on the opposing circumferential surface 52c; and a phase change mechanism which supplies and discharges the actuating fluid (working oil) to and from the operating chambers 54d, 54e, and relatively rotates the first and second rotors to change the phase expressing the relative rotation angle between both rotors. In this motor, springs 54f for energizing the sealing members 54c toward the circumferential surface, and recesses 52d opened to the circumferential surface are provided, and the sealing members 54c are engaged with the recesses 52d and made fixable at the positions thereof. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric motor. More specifically, the first and second magnetized rotors are rotated relative to each other to change the phase indicating the relative rotation angle between the two, and the phase can be fixed at a predetermined position. The present invention relates to a motor control device.

As an example of an electric motor in which the magnetized first and second rotors are relatively rotated to change the phase indicating the relative rotation angle between them, the technique described in Patent Document 1 below can be cited. . In the technique described in Patent Document 1, a plurality of partition walls that are fixed to one of the first and second rotors and extend in the radial direction, and two adjacent ones that are fixed to the other while being fixed to the other. The first and second operations are defined by a vane extending in the radial direction between the partition walls and sealed by bringing a seal member attached to the tip of the vane into contact with the opposing circumferential surface The working fluid is supplied to and discharged from the chamber, and the first and second rotors are rotated relative to each other, thereby changing the phase indicating the relative rotation angle between them.
JP 2007-244040 A

  By the way, in this type of electric motor, the stable phase position may change depending on the magnetization state of the first and second rotors, and the characteristic may be stable at the position where the surface magnetic flux is the smallest. In such an electric motor, when a large load is applied at the time of starting, etc., it is necessary to move (rotate) to a phase position where it can be output because necessary torque cannot be output at a stable point, but depending on the temperature condition of the working fluid It may take time to move and the required torque cannot be output quickly.

  Further, even when a characteristic that stabilizes at the position where the surface magnetic flux is the largest is provided, it may be necessary to move from a stable point to an intermediate position or a weaker phase side when a large torque is not required at the time of starting.

  Accordingly, an object of the present invention is to eliminate the above-mentioned problems, and the first and second magnetized rotors are rotated relative to each other to change the phase indicating the relative rotation angle between them, and the phase is set to a predetermined value. It is to provide an electric motor that can be fixed at a position.

  In order to achieve the above object, according to claim 1, the first and second rotors which are respectively magnetized and rotate about the same axis, and the first and second rotations. Between a plurality of partition walls fixed to one of the cores and projecting in the radial direction, and two adjacent partition walls among the plurality of partition walls fixed to the other of the first and second rotors The first and second seals are defined by the radially projecting vanes and sealed against a circumferential surface facing a sealing member attached to at least one of the partition walls and the vanes. The working fluid is supplied and discharged from a fluid source via a second working chamber and first and second fluid paths communicating with the first and second working chambers, and the first and second rotors. And a phase change mechanism that changes the phase indicating the relative rotation angle of the two by rotating relative to each other about the axis. And a biasing means for biasing the seal member toward the circumferential surface, and a recess opened in the circumferential surface, so that the seal member is engaged with the recess and the phase is adjusted. It was configured to be fixed at that position.

  In the electric motor according to claim 2, the operation is performed via the recessed fluid path that communicates the bottom of the recessed portion and the fluid source, and the recessed fluid path and the first and second fluid paths. Working fluid supply / discharge means for supplying and discharging fluid, and thus supplying the working fluid from the recessed fluid path to press the seal member from the bottom side, and to the first and second working chambers, The working fluid is supplied and discharged so that the seal member can be freely detached from the recess.

  In the electric motor according to claim 3, the working fluid supply / discharge means supplies and discharges the working fluid to and from the first and second working chambers when the electric motor is stopped. It was comprised so that it might engage with a recessed part.

  According to the first aspect of the present invention, the partition wall is fixed to one of the first and second rotors that are magnetized and rotated about the same axis, and the vane is fixed to the other. And a first working chamber and a second working chamber which are sealed by bringing a sealing member attached to at least one of the partition wall and the vane into contact with the opposing circumferential surfaces, and communicated with them. Phase change for changing the phase indicating the relative rotation angle by supplying and discharging the working fluid from the fluid source via the first and second fluid paths and rotating the first and second rotors relative to each other about the axis. An electric motor including a mechanism, and an urging means for urging the seal member toward the circumferential surface, and a concave portion opened in the circumferential surface. Since it is configured so that it can be fixed at a position, a recess is formed at a desired position. The first, second rotor, such as during start-up it is possible to fix its position, thus it is possible to output a torque required quickly, such as during start-up with the.

  In other words, when the electric motor has the characteristic that the surface magnetic flux is stabilized at the phase position where the surface magnetic flux is the smallest, and when it is mounted on a hybrid vehicle or the like, when a large load is applied at the start such as when starting the vehicle, the necessary torque is obtained at the stable point. Since it cannot be output, it is necessary to move to a phase position where output is possible. Also, depending on the temperature conditions of the hydraulic oil, it may take time to move and the required torque cannot be output quickly. However, by configuring as described above, it is possible to quickly output a torque necessary at the time of starting. Also, the structure is simple.

  In addition, some motors have the characteristic of being stable at the position where the surface magnetic flux is the largest, and if not so much torque is required at the time of starting, it may be necessary to move from the stable point to the intermediate position or weaker phase side. However, the same effect can be obtained in such a case.

  In the electric motor according to claim 2, the working fluid is supplied and discharged through the concave fluid path that communicates the bottom of the concave part and the fluid source, and the concave fluid path and the first and second fluid paths. Working fluid supply / discharge means, and thus, supply the working fluid from the recessed fluid path to press the seal member from the bottom side, and supply and discharge the working fluid to the first and second working chambers to recess the seal member. In addition to the above-described effects, the first and second rotors can be quickly rotated relative to each other by removing the seal member from the recess when the fixing becomes unnecessary.

  In the electric motor according to claim 3, when the electric motor is stopped, the working fluid supply / discharge means supplies and discharges the working fluid to and from the first and second working chambers and engages the seal member with the recess. Since it comprised, in addition to the above-mentioned effect, the torque required at the time of starting can be output reliably.

  The best mode for carrying out the electric motor according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing an overall configuration when an electric motor according to an embodiment of the present invention is incorporated in a hybrid vehicle, and FIG. 2 is a schematic diagram showing a control device for the electric motor shown in FIG.

  In FIG. 1, reference numeral 1 denotes a hybrid vehicle (hereinafter referred to as “vehicle”), and an electric motor (motor) 10 and an internal combustion engine (hereinafter referred to as “engine”) 12 are mounted on the vehicle 1. The electric motor 10 is specifically a brushless or AC synchronous motor. The engine 12 is a gasoline injection spark ignition type, has four cylinders, and is connected to the electric motor 10 by a drive shaft 14 (shown in FIG. 2). Outputs of the electric motor 10 and the engine 12 are input to the transmission 16. The transmission 16 shifts the output of the engine 12 and the like, and transmits it to the wheels (drive wheels) 20 to drive the vehicle 1.

  The electric motor 10 always rotates when the engine 12 rotates, and is energized at the time of starting to crank and start the engine 12, and is also energized at the time of acceleration or the like to assist the rotation of the engine 12 (acceleration). When the electric motor 10 is not energized, the motor 10 idles as the engine 12 rotates, and converts the kinetic energy generated by the rotation of the drive shaft 14 into electric energy and outputs it during deceleration when the fuel supply to the engine 12 is stopped. It functions as a generator with a regenerative function.

  As shown in FIG. 2, the electric motor 10 is connected to a battery 24 via a power drive unit (referred to as “PDU”) 22. The PDU 22 includes an inverter, converts the DC power supplied from the battery 24 into AC power and supplies it to the motor 10, and converts AC power generated by the regenerative operation of the motor 10 into DC power and supplies it to the battery 24. To do.

  Further, an engine control unit (ENGECU) 26 that controls the operation of the engine 12, a motor control unit (MOTECU) 30 that controls the operation of the electric motor 10, and a state of charge (SOC) of the battery 24 are calculated and charged / discharged. A battery control unit (BATECU) 32 that manages the above and a transmission control unit (T / MECU) 34 that controls the operation of the transmission 16 are provided. All the ECUs (electronic control units) such as the above-described ENGECU 26 are composed of a microcomputer, and are connected to each other via a communication bus 36 so as to be able to communicate with each other.

  Here, the electric motor 10 will be described in detail.

  3 is a cross-sectional view of the main part of the electric motor 10 shown in FIG. 1 and the like, FIG. 4 is an exploded perspective view showing the phase changing mechanism of the electric motor shown in FIG. 2 and the like, and FIG. FIG. 6 is a side view of the rotor of the electric motor 10 shown in FIG. 3, and FIG. 7 is a side view of the rotor similar to FIG.

  As shown in the figure, the electric motor 10 includes an annular stator (stator) 40, a similarly annular rotor (rotor) 42 accommodated inside, and a rotating shaft (rotating axis) 44. The stator 40 is formed by laminating thin plates manufactured from iron-based materials (or casting iron-based materials), and is arranged with three-phase (U, V, W-phase) stator windings 40a.

  The rotor 42 includes an outer peripheral side (first) rotor 42 a and an inner peripheral side (second) rotor 42 b that is relatively rotatable about the rotation shaft 44. The rotors 42a and 42b are made of, for example, an iron core made of sintered metal, and a plurality of, more specifically 16 sets of elongated magnet pieces (permanent magnets) 46a and 46b are slightly connected to each other on the circumferential side. Are arranged at a certain interval.

  More specifically, as shown in FIG. 6 or FIG. 7, 16 magnet pieces 46a are arranged on the outer rotor 42a so that the longitudinal direction of the magnet pieces 46a faces the radial direction of the rotor 42a. On the other hand, 16 sets of magnet pieces 46b are arranged on the rotor 42b on the inner circumferential side, and the longitudinal direction of the magnet pieces 46b faces the circumferential direction of the rotor 42a. It arrange | positions so that it may exhibit.

  The 16 magnet pieces 46b on the outer peripheral side are each composed of magnet pieces magnetized in the circumferential (circumferential) direction, and are arranged so that the magnetization directions are different between adjacent pairs. That is, the magnet piece 46a magnetized with the S pole and the N pole is arranged next to the magnet piece 46a magnetized with the N pole and the S pole in the circumferential direction, and so on.

  The 16 sets of magnet pieces 46b on the inner peripheral side are each composed of two magnet pieces that are similarly magnetized in the thickness (radius) direction, and are arranged so that the magnetization directions differ between adjacent sets. That is, a set of two magnet pieces 46b whose outer peripheral side is an S pole are arranged next to each other in the circumferential direction of a pair of magnet pieces 46b whose outer peripheral side is an N pole, and so on. .

  As shown in FIG. 4, the rotor 42 is provided with a phase changing mechanism 50. The phase changing mechanism 50 includes a vane rotor 52 that is fixed to the rotating shaft 44 via a spline (not shown), an annular housing 54 that is fitted and fixed to the inner peripheral surface of the rotor 42b on the inner peripheral side, A pair of drive plates 56 that fix the vane rotor 52 to the rotor 42a on the outer peripheral side with pins 56a, and a hydraulic mechanism (working fluid supply / discharge mechanism that supplies working oil (working fluid, more specifically, hydraulic pressure) to them. 60 which will be described later.

  The vane rotor 52 is formed with a plurality of (six) vanes 52a protruding from the central boss portion at equal intervals in the radial direction, and the annular housing 54 has the same intervals at the center side. A plurality of (six) partition walls 54a projecting in the radial direction are formed.

  A seal member 52b is attached to the tip of the vane 52a. When facing the vane 52a, the seal member 52b comes into contact with the inner wall surface (circumferential surface) 54b of the annular housing 54 and seals liquid-tightly, and also seals the tip of the partition wall 54a. The member 54c is attached, and comes into contact with the outer peripheral surface (circumferential surface) 52c of the boss portion of the vane rotor 52 facing the partition wall 54a to seal the fluid tightly. As shown in FIG. 4, the seal members 52 b and 54 c have an axial length similar to that of the vane 52 a or the partition wall 54 a.

  As shown in FIG. 3, the annular housing 54 has an axial length (width) that is larger than that of the rotor 42b on the inner peripheral side, and an annular groove 56b (FIG. 4) formed in the two drive plates 56. The annular housing 54 (partition wall 54a) and the inner peripheral rotor 42b are rotatably supported by the rotating shaft 44.

  The two drive plates 56 are slidably brought into close contact with both side surfaces of the annular housing 54, and six sealed spaces are formed between the partition wall 54 a of the annular housing 54 and the outer peripheral surface of the boss portion of the vane rotor 52. This sealed space is divided into two by a partition wall 54a of the annular housing 54, and forms an advance side working chamber (first working chamber) 54d and a retard side working chamber (second working chamber) 54e. Here, the “advance angle” (ADV) means that the rotor 42b on the inner circumference side is in the same direction as the rotation direction of the electric motor 10 indicated by the arrow ADV (FIG. 6 or FIG. 7) with respect to the rotor 42a on the outer circumference side. The “retard angle” (RTD) means rotating in the opposite direction.

  In the advance side working chamber 54d and the retard side working chamber 54e, working fluid, specifically incompressible fluid, more specifically ATF (Automatic Transmission Fluid) of the transmission 16 or lubricating oil of the engine 12 or the like. Hydraulic oil (oil) is supplied. The hydraulic oil is supplied from the rotating shaft 44 to the advance side working chamber 54d and the retard side working chamber 54e through two oil passages 62 and 64 formed in the vane rotor 52.

  The oil passages 62 and 64 are substantially parallel to each other, and as shown in FIGS. 3 and 6, the oil passages 62 a and 64 a drilled in the axial direction of the rotating shaft 44 and the outer peripheral surface of the rotating shaft 44 continuously therewith. The oil passages 62b and 64b are formed, and 62c and 64c are formed radially in the boss portion of the vane rotor 52 continuously. The oil passage 62 is connected to the advance side working chamber 54d, and the oil passage 64 is connected to the retard side working chamber 54e, and hydraulic oil is supplied to and discharged from a reservoir (fluid source) described later.

  The advance-side working chamber 54d and the retard-side working chamber 54e expand and contract as hydraulic oil is supplied and discharged, so that the inner periphery integrated with the partition wall 54a with respect to the vane 52a fixed to the outer rotor 42a. The phase of the relative rotation angle between the outer peripheral rotor 42a and the inner peripheral rotor 42b is reduced from 0 degrees by the relative rotation of the side rotor 42b about the rotation axis (rotation axis) 44. It is changed between 180 degrees, and the induced voltage of the electric motor 10 is changed accordingly.

  FIG. 6 shows the advance side working chamber 54d and the retard side working chamber 54e when in the most retarded position, and FIG. 7 shows the advance side working chamber 54e. When in the retard position, the retard side working chamber 54e is supplied with hydraulic fluid, while the hydraulic fluid is discharged from the advance side working chamber 54d, and as shown in FIG. The working chamber 54e expands to the maximum limit, while the advance side working chamber 54d contracts to the maximum limit. In the advanced position, the hydraulic fluid is supplied to the advanced working chamber 54d, while the hydraulic fluid is discharged from the retarded working chamber 54e. As shown in FIG. The angle-side working chamber 54d expands to the maximum limit, while the retard-side working chamber 54e contracts to the maximum limit.

  In the electric motor 10 according to this embodiment, as shown in FIG. 5A, the magnet pieces 46a of the outer rotor 42a and the magnet pieces 46b of the inner rotor 42b have the same polarity. When the phase is in the same polarity arrangement, the combined magnetic flux of both is strengthened field (field increases) (in other words, in the strengthened phase position). On the other hand, as shown in FIG. 5 (b), when the magnet piece 46a of the rotor 42a on the outer peripheral side and the magnet piece 46b of the rotor 42b on the inner peripheral side are in a phase where the different poles are opposed to each other, The resulting magnetic field is weakened (the field is reduced) (in other words, at the weakening phase position).

  The phase of the outer rotor 42a and the inner rotor 42b can be changed between 0 degrees and 180 degrees in electrical angle so that a desired combined magnetic flux can be obtained. The 180 degree side is the advance side. FIG. 5A shows the same-pole arrangement of the magnet pieces 46a and 46b at 0 degree (most retarded angle position), and at this time, the field is strengthened most. FIG. 5B shows a counter electrode arrangement of the magnet pieces 46a and 46b at 180 degrees (most advanced angle position), and at this time, the field is weakened most.

  Thereby, the induced voltage constant Ke of the electric motor 10 is changed, and the characteristics of the electric motor 10 are changed. That is, when the induced voltage constant Ke increases due to the strong field, the allowable rotational speed at which the motor 10 can operate decreases, but the maximum torque that can be output increases, and conversely, when the induced voltage constant Ke decreases due to the weak field. The maximum torque that can be output decreases, and the allowable rotational speed increases.

  In the electric motor 10 according to this embodiment, when the inner circumferential side rotor 42b is at the most advanced angle position (phase 180 degrees) with respect to the outer circumferential side rotor 42a, in other words, when it is in a weaker phase. Has stable characteristics. That is, when no hydraulic pressure is supplied, the rotor 42 rotates relative to the most advanced position and stops at that position.

  FIG. 8 is a hydraulic circuit diagram of the hydraulic mechanism 60 described above that supplies hydraulic oil to the advance side working chamber 54d and the retard side working chamber 54e via the oil passages 62 and 64.

  As shown in the figure, the hydraulic mechanism 60 includes a hydraulic pump 60d that pumps hydraulic oil from a reservoir (tank, fluid source) 60a through a filter 60b, increases the pressure thereof, and outputs the hydraulic pressure to the oil path 60c. A switching valve 60e that is switchably connected to either the advance side working chamber 54d or the retard side working chamber 54e through 62, 64, and an oil passage 60c, and is advanced through the switching valve 60e. A flow rate adjusting valve 60f that adjusts the flow rate of the working oil supplied to the working chamber 54d and the retard side working chamber 54e is provided. These operations are controlled by the MOTECU (motor control unit) 30 described above.

  The switching valve 60e is a 4-port valve (direction switching valve). A linear solenoid valve 60g for switching the port is connected to the switching valve 60e. The linear solenoid valve 60g is interposed between the hydraulic pump 60d and the switching valve 60e in the oil passage 60c, and includes an electromagnetic solenoid 60g1, and the spool (valve) is operated by exciting and demagnetizing the electromagnetic solenoid 60g1. It is possible to switch between a first position where oil, more specifically oil pressure, acts on the spool (not shown) of the switching valve 60e and a second position where the hydraulic oil is drained. A broken line indicates a relief valve system.

  In the switching valve 60e, the spool (valve element) connects the oil passage 60c to the advance side working chamber 54d via the oil passage 62 to supply hydraulic oil, while the retard side working chamber 54e is set to the drain side. The first position where the hydraulic oil is connected and discharged, and the oil passage 60c is connected to the retarded-side working chamber 54e via the oil passage 64 to supply the working oil, while the advanced-side working chamber 54d is set to the drain side. It is configured to be switchable between a second position for connecting and draining (draining) hydraulic oil and an intermediate (neutral) position for closing the four ports and holding the hydraulic oil between them. . The spool is biased to the second position by the spring 60e1.

  Specifically, the second position is selected when the hydraulic pressure is not applied from the linear solenoid valve 60g, and the intermediate position is selected when a relatively small hydraulic pressure is applied from the linear solenoid valve 60g. When the large hydraulic pressure is applied from the linear solenoid valve 60g, the first position is selected.

  The flow rate adjusting valve 60f is also a linear solenoid valve, and includes an electromagnetic solenoid 60f1 and PWM control of the electromagnetic solenoid 60f1, so that the hydraulic oil is supplied to the advance side working chamber 54d and the like via the switching valve 60e. Between the first position where the hydraulic oil is drained and the second position where the hydraulic oil is drained is configured to be switchable, and the hydraulic oil having a flow rate corresponding to the switched position is output to the oil passage 60c. Adjust the flow rate of hydraulic oil. A broken line shows a relief valve system.

  The hydraulic fluid in the oil passage 60c whose flow rate is adjusted by the flow rate adjusting valve 60f is supplied to the advance side working chamber 54d or the retard side working chamber 54e via the switching valve 60e. As described above, when the hydraulic fluid is supplied, the advance side working chamber 54d expands according to the flow rate thereof, and the phase is set to an arbitrary position between the most advanced position (180 degrees) and the intermediate position (90 degrees). When the hydraulic oil is supplied, the retard side working chamber 54e also expands according to the flow rate, and the phase is between the intermediate position (90 degrees) and the most retarded position (0 degrees). Change to any position.

  As shown at the end of FIG. 8, the hydraulic pump 60d is connected to the second electric motor 60j and is configured as an EOP (Electric Oil Pump) driven by the second electric motor 60j. The second electric motor 60j is connected to an inverter circuit (INV) 60k.

  Returning to the description of FIG. 1, a wheel speed sensor 70 is disposed in the vicinity of each wheel 20 in the vehicle 1, and a pulse signal indicating the vehicle speed is output at every predetermined rotation of the wheel 20. An AP opening sensor 72 is disposed near the accelerator pedal on the floor of the driver's seat (not shown), and generates an output corresponding to the accelerator pedal opening by the driver. A phase sensor 74 is arranged to generate an output corresponding to the actual phase value θ. The outputs of these sensors are also sent to the MOTECU 30.

  The MOTECU 30 controls the operation of the electric motor 10, and excites and demagnetizes the linear solenoid 60g and the electromagnetic solenoids 60g1 and 60f1 of the flow rate adjusting valve 60f in accordance with the operating state such as the rotational speed of the electric motor 10, the battery voltage, and the current command value. To change (control) the phase.

  Here, the characteristics of the electric motor 10 according to this embodiment will be described with reference to FIGS. 9 and 10. The electric motor 10 uses the seal member 54 c attached to the tip of the partition wall 54 a as the outer periphery of the boss portion of the vane rotor 52. A spring (biasing means) 54f for biasing toward the surface 52c and a recess 52d opened in the outer peripheral surface 52c are provided. 9 is a partially enlarged view of FIG. 6 and FIG. 10 is a partial enlarged view of FIG.

  The electric motor 10 according to this embodiment has a characteristic in which the field is strengthened most when it is at the most retarded position (phase 0 degree) and is stable when it is at the most advanced position (phase 180 degrees) on the weakest phase side. Therefore, the recess 52d is formed in the outer peripheral surface 52c at a position where the rotor 42b is at the most retarded angle position (phase 0 degree) with respect to the rotor 42a (illustration of the recess 52d is omitted in FIG. 4). .

  The MOTECU 30 supplies and discharges hydraulic oil so that the retard-side working chamber 54e expands to the maximum extent while the advance-side working chamber 54d contracts to the maximum extent, so that the seal member 54c is positioned on the recess 52d. Thus, the operation of the hydraulic mechanism 60 is controlled. Since the seal member 54c is biased toward the outer peripheral surface 52c by the spring 54f, the seal member 54c is engaged (fitted) with the recess 52d.

  Since the recess 52d has the same axial length as the seal member 54c, the seal member 54c is firmly engaged with the recess 52d, and the phase of the electric motor 10 is securely fixed at that position. Further, as shown in the figure, all the recesses 52d are formed in the outer peripheral surface 52c of the six advance side working chambers 54d, and all the seal members 54c of the six partition walls 54a are attached to the outer peripheral surface 52c by the spring 54f. As a result, the phase of the electric motor 10 is more reliably fixed at that position. The spring 54f is a coil spring, but may be a leaf spring.

  Further, a concave fluid path 80 is provided that communicates the bottom 52d1 of the concave 52d and the reservoir 60a. The recessed fluid passage 80 is formed by branching the oil passage 62c. The MOTECU 30 engages the seal member 54c with the recess 52d, then supplies hydraulic oil from the recess fluid path 80 to press the seal member 54c from the bottom 52d1 side, and supplies the hydraulic oil to the advance side working chamber 54d. On the other hand, the hydraulic oil is discharged from the retard side working chamber 54e, so that the partition wall 54a and the seal member 54c are rotated (moved) clockwise in FIG. 6 and the like, and the seal member 54c is detached from the recess 52d. The operation of the hydraulic mechanism 60 is controlled.

  Next, the operation of the above-described MOTECU 30 will be described with reference to FIGS. FIG. 11 is a flowchart showing the control executed when the engine 12 is stopped and FIG. 12 is executed when the engine 12 is started.

  Referring first to FIG. 11, in S10, communication with the engine control unit 26 is performed to determine whether the ignition switch of the engine 12 is turned off, that is, whether the engine 12 has been stopped. To skip.

  On the other hand, when the result in S10 is affirmative, the program proceeds to S12, in which an EOP (electric hydraulic pump) 60d is driven to engage the seal member 54c with the recess 52d. That is, while the retard side working chamber 54e is expanded to the maximum extent, the advance side working chamber 54d is contracted to the maximum extent and the seal member 54c is engaged with the recess 52d. Next, in S14, the EOP 60d is stopped.

  Next, with reference to FIG. 12, similarly in S100, it communicates with the engine control unit 26 to determine whether the ignition switch of the engine 12 is turned on, that is, whether the engine 12 has been started. Skip the process.

  On the other hand, when the result in S100 is affirmative, the process proceeds to S102, in which it is determined whether or not the vehicle speed V of the vehicle 1 exceeds a predetermined vehicle speed Vref (for example, 80 km / h), and when the result is negative, the subsequent processing is skipped.

  On the other hand, when the result in S102 is affirmative, the program proceeds to S104, and when the seal member 54c is still engaged with the recess 52d, the EOP 60d is driven to release the engagement. That is, while supplying hydraulic oil from the concave fluid passage 80 and supplying hydraulic oil to the advance side working chamber 54d, the hydraulic oil is discharged from the retard side working chamber 54e and the seal member 54c is released from the concave portion 52d ( Leave). Next, in S106, the EOP 60d is stopped and normal phase control is executed, that is, the phase of the electric motor 10 is controlled based on the operating state such as the rotational speed of the electric motor 10 and the battery voltage.

  In S102, the determination may be made by using the motor torque, the field weakening current command value, the difference between the power supply voltage and the motor generated voltage, or the like instead of the vehicle speed.

  As described above, in this embodiment, the first and second rotors (the outer peripheral side rotor 42a, the inner peripheral side, which are magnetized and rotate about the same axis (rotation axis) 44, respectively. Side rotor 42b), a plurality of (six) partition walls 54a fixed to one of the first and second rotors and projecting in the radial direction, and the first and second rotors A vane 52a protruding in the radial direction between two adjacent partition walls among the plurality of adjacent partition walls while being fixed to the other, and at least one of the partition wall 54a and the vane 52a; Specifically, first and second working chambers (advanced-side working chambers) sealed by contacting a circumferential surface (outer circumferential surface) 52c facing the sealing member 54c attached to the tip of the partition wall 54a. 54d, the retarded-side working chamber 54e) and the first and second working chambers communicated with each other. The working fluid (hydraulic fluid) is supplied and discharged from the fluid source (reservoir 60a) via the second fluid passage (oil passages 62 and 64), and the first and second rotors are centered on the axis 44. In the electric motor 10 including the phase changing mechanism 50 that changes the phase indicating the relative rotation angle by rotating the both relative to each other, an urging means (spring) 54f that urges the seal member 54c toward the circumferential surface; And the recess 52d opened in the circumferential surface, and thus the seal member 54c is engaged with the recess 52d so that the phase can be fixed at that position. By forming them, the outer and inner rotors 42a and 42b can be fixed at the positions at the time of start-up, so that the necessary torque can be output quickly at the time of start-up. .

  That is, since the electric motor 10 has the characteristic that the surface magnetic flux is stable at the most advanced angle position, when the electric motor 10 is mounted on the hybrid vehicle 1, when a large load is applied at the time of starting such as the start of the vehicle 1, Since the necessary torque cannot be output, it is necessary to move to a retarding position where output is possible. Also, depending on the temperature conditions of the hydraulic oil, it may take time to move and the required torque cannot be output quickly. However, in this embodiment, by configuring as described above, the electric motor 10 can quickly output a torque necessary for starting. Also, the structure is simple.

  In addition, the electric motor 10 according to the present embodiment is not so, but depending on the electric motor, the electric motor 10 has a characteristic that the surface magnetic flux is stable at the position where the surface magnetic flux is the largest. Alternatively, it may be necessary to move to the weak phase side, but the same effect can be obtained in such a case.

  Further, the recess fluid path 80 that communicates the bottom 52d1 of the recess 52d and the fluid source, or the recess fluid path 80 and any of the first and second fluid paths (oil paths 62 and 64), more specifically. Specifically, it is provided with a working fluid supply / discharge means (hydraulic mechanism 60, motor ECU (MOT ECU) 30) for supplying and discharging the working fluid (working oil) through the oil passage 62, and thus the operation from the recessed fluid passage 80. The fluid is supplied to press the seal member 54c from the bottom 52d1 side, and the working fluid is supplied to and discharged from the first and second working chambers (advanced side working chamber 54d and retarded side working chamber 54e). Since the seal member 54c is configured to be detachable from the recess 52d, in addition to the above-described effects, when the fixing is unnecessary, the seal member 54c is detached from the recess 52d and the first and second Rotor (outside Side of the rotor 42a, the inner circumferential side of the rotor 42b) can be rapidly relative rotation. Further, since the recessed fluid path 80 is formed by branching from one of the first and second fluid paths (oil paths 62 and 64), more specifically, from the oil path 62, the structure is further simplified.

  Further, the working fluid supply / discharge means is configured so that when the electric motor 10, more specifically, the engine 12, is stopped, the first and second working chambers (the advance side working chamber 54d and the retard side working chamber 54e). ), The working fluid is supplied and discharged and the seal member 54c is engaged with the recess 52d. In addition to the above-described effects, it is possible to reliably output the torque required at the time of starting.

  In the above description, the recesses 52d are formed in all of the six advance side working chambers 54d. Further, the seal member 54c of the partition wall 54a is engaged, but a recess may be formed on the inner wall surface 54b of the annular housing 54 and the seal member 52b of the vane 52a may be engaged therewith.

  Further, the electric motor according to the present invention has been described by taking the electric motor mounted on the parallel hybrid vehicle as an example. However, the present invention is applied to the electric motor mounted on the series hybrid vehicle, and further to the electric motor mounted on the electric vehicle not equipped with the engine. Is also valid.

  In addition, at least one of the first and second rotors, more specifically, the second rotor 42b is relatively rotated by the rotation shaft 44, and the phase θ indicating the relative rotation angle of both is changed. However, the phase may be changed by relatively rotating both the first and second rotors.

  Furthermore, although the working oil has been exemplified as the working fluid, other fluids may be used.

It is the schematic which shows the whole structure when the electric motor which concerns on the Example of this invention is integrated in a hybrid vehicle. It is the schematic which shows the control apparatus of the electric motor shown in FIG. It is principal part sectional drawing of the electric motor shown in FIG. It is a disassembled perspective view which shows the phase change mechanism of the electric motor shown in FIG. It is a schematic diagram which shows the direction of the magnetic pole of the magnet of the rotor shown in FIG. It is a side view of the rotor of the electric motor shown in FIG. 3 is a side view of the rotor of the electric motor shown in FIG. FIG. 7 is a hydraulic circuit diagram of a hydraulic mechanism that supplies hydraulic pressure to the working chamber of the phase change mechanism shown in FIG. 6. It is the elements on larger scale of FIG. It is the elements on larger scale of FIG. 3 is a flowchart showing the operation of the motor control unit shown in FIG. 3 is a flowchart showing similarly the operation of the motor control unit shown in FIG. 2.

Explanation of symbols

  10 motor, 12 engine (internal combustion engine), 16 transmission, 22 PDU (power drive unit), 30 motor control unit, 40 stator, 42 rotor, 42a outer peripheral side (first) rotor, 42b inner peripheral side ( 2nd rotor, 44 rotating shaft (rotating axis), 46a, 46b magnet piece, 50 phase change mechanism, 52 vane rotor, 52a vane, 52c outer peripheral surface (circumferential surface), 52d recess, 54 annular housing, 54a partition Wall, 54c sealing member, 54d advance side working chamber (second working chamber), 54e retard side working chamber (first working chamber), 54f spring (biasing means), 56 drive plate, 62, 64 oil Path (first and second fluid paths), 60 hydraulic mechanism, 60a reservoir (fluid source), 60d hydraulic pump, 80 recessed fluid path

Claims (3)

  First and second rotors that are respectively magnetized and rotate about the same axis, and a plurality of partition walls that are fixed to one of the first and second rotors and project radially And a vane protruding in the radial direction between two adjacent partition walls of the plurality while being fixed to the other of the first and second rotors, and the partition The first and second working chambers are sealed by bringing a seal member attached to at least one end of the wall and the vane into contact with the opposing circumferential surfaces, and the first and second working chambers. The working fluid is supplied / discharged from the fluid source via the first and second fluid passages communicated with each other, and the first and second rotors are rotated relative to each other about the axis to show the relative rotation angle between them. An electric motor having a phase change mechanism for changing a phase, and biasing the seal member toward the circumferential surface And biasing means that, provided with an opening by recesses on the circumferential surface, thus the motor, characterized in that said sealing member is engaged with the recess and fixable to the phase at that position.   A recessed fluid path that communicates the bottom of the recessed part with the fluid source; and a working fluid supply / discharge means that supplies and discharges the working fluid via the recessed fluid path and the first and second fluid paths. Therefore, the working fluid is supplied from the recessed fluid path to press the seal member from the bottom side, and the working fluid is supplied to and discharged from the first and second working chambers to remove the seal member. The electric motor according to claim 1, wherein the electric motor is detachable from the recess.   The working fluid supply / discharge means supplies and discharges the working fluid to and from the first and second working chambers and engages the seal member with the recess when the electric motor is stopped. Item 3. The electric motor according to Item 2.

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