JP3958477B2 - Brushless motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brushless motor.
[0002]
[Prior art]
FIG. 10 is a cross-sectional view showing an example of a conventional product. As shown in FIG. 10, the brushless motor A includes a switching element C that switches a current path of a driving current that flows through the coil B <b> 1 of the stator B, and a driving circuit D through which the driving current flows, and a current path switching timing of the switching element C. And a control circuit F for controlling the rotation of the motor shaft E is formed on the same electric circuit board G and accommodated in the circuit protection case H.
[0003]
This brushless motor A has the following problems. That is, it is necessary to support the heat sink J with the switching element C mounted on the electric circuit board G until the heat sink J to which the switching element C is attached is assembled to the circuit protection case H. Therefore, a forming process for bending the connection terminal C1 of the switching element C in advance to increase the bending resistance of the connection terminal C1 is necessary for the connection terminal C1 of the switching element C, which is disadvantageous in terms of cost.
[0004]
Further, the connecting terminals of large electrical components such as the electrolytic capacitor K used in the driving circuit D also require a forming process in which the connecting terminals are bent in advance in order to fix the connecting terminals to the wiring pattern of the electric circuit board G. This is also disadvantageous in terms of cost.
[0005]
Further, since the driving circuit D and the control circuit F are formed on the same electric circuit board G, the thickness of the copper foil of the electric circuit board G must be designed in accordance with the driving current flowing through the driving circuit D. The wiring pattern for the control circuit F in which a control current smaller than the drive current flows becomes thicker than necessary, which is disadvantageous in terms of cost.
[0006]
In addition, since the wiring pattern for the control circuit F becomes thicker than necessary, the wiring pattern for the control circuit F is wide in consideration of under-etching when the wiring pattern of the electric circuit board G is formed by etching. In other words, the control circuit F is downsized. In addition, since the drive circuit D and the control circuit F are formed on the same electric circuit board G, the wiring pattern for the control circuit F must be formed by bypassing large electric components such as the electrolytic capacitor K of the drive circuit D. In this respect, the control circuit F is downsized.
[0007]
In order to solve these problems, the present inventors have proposed the following invention in the specification and drawings attached to 1998 Patent Application No. 167466. In the present invention, the drive circuit and the control circuit are formed separately. Further, the drive circuit is divided into a first drive circuit having a switching element and a second drive circuit having an electric circuit component for the drive circuit excluding the switching element.
[0008]
That is, the control circuit is formed on the control circuit board. The first drive circuit is formed on the drive circuit board. The second drive circuit is formed in an inner case in which an electric circuit component such as an electrolytic capacitor can be assembled. The first drive circuit and the second drive circuit are electrically connected by a drive terminal mounted in advance on the drive circuit board of the first drive circuit. The first drive circuit and the control circuit are electrically connected by a control terminal mounted in advance on the drive circuit board of the first drive circuit.
[0009]
The drive terminal and the control terminal are assembled to the terminal case, and the terminal case and the drive circuit board are assembled together in advance. The terminal case integrated with the drive circuit board in advance is disposed between the heat sink and the inner case, and is fixed to the circuit protection case together with the inner case. By this fixing, the heat sink is assembled to the circuit protection case, and the drive circuit board is brought into contact with the heat sink.
[0010]
[Problems to be solved by the invention]
By the way, in the invention proposed by the present inventors, it is necessary to electrically connect a control terminal assembled in the terminal case and pre-mounted on the drive circuit board of the first drive circuit to a predetermined position of the wiring pattern of the control circuit board. There is. However, because the terminal case fixing position changes due to rattling when the terminal case is fixed together with the inner case to the circuit protection case, the position of the control terminal assembled in the terminal case within the circuit protection case Will also change.
[0011]
Therefore, if the control terminal is electrically connected to a predetermined position of the control circuit board, the control circuit board may not be fixed to the predetermined position of the circuit protection case. In this case, it is necessary to re-fix the terminal case and the inner case to the circuit protection case, and the manufacturing efficiency is deteriorated.
[0012]
Therefore, in the present invention, the positional displacement of the control terminal mounted in the terminal case and mounted in advance in the drive circuit board in the circuit protective case is controlled so that the control terminal is electrically connected to a predetermined position. The circuit board can be kept within a range that can be fixed at a predetermined position of the circuit protection case, and therefore, the trouble of re-fixing the terminal case and the inner case to the circuit protection case can be saved, thereby improving the manufacturing efficiency. It is an object to provide a brushless motor that can be used.
[0013]
[Means for Solving the Problems]
The invention according to claim 1 is a first drive circuit formed on the drive circuit board, a second drive circuit formed on the inner case and electrically connected to the first drive circuit, and a control formed on the control circuit board. A circuit protection case containing a circuit, a control terminal mounted in advance on the drive circuit board and electrically connected to a predetermined position of the control circuit board, and both the first and second drive circuits and the control circuit; A heat sink that is assembled to the circuit protection case and dissipates the heat in the circuit protection case to the outside of the circuit protection case, and the control terminal is assembled and integrated with the drive circuit board in advance and disposed between the heat sink and the inner case. A brushless motor comprising a terminal case fixed to a circuit protection case together with a case and having a drive circuit board in contact with a heat sink. An engaging portion is provided on each of the minor cases, and the inner case is engaged with both engaging portions, and the inner case and the terminal case are positioned based on the engagement with the engaging portion of the circuit protection case. An engaged portion is provided.
[0014]
The invention of claim 2 is the brushless motor according to claim 1, wherein the engaging portion of the circuit protection case and the engaging portion of the terminal case are tapered ridges or narrowly engaged with the ridges. Any one of the engagement grooves, and the engaged portion is the other.
[0015]
The invention according to claim 3 is the brushless motor according to claim 2, wherein the inner case has a control circuit chamber in which a control circuit is accommodated, a first drive circuit, a second drive circuit, and a drive in which a heat sink is accommodated. A partition wall that divides the inside of the circuit protection case is provided in the circuit chamber, and the engaged portion is provided over the entire length of the partition wall at the tip of the partition wall on the heat sink side.
[0016]
【The invention's effect】
According to the first aspect of the present invention, the inner case is positioned by the engagement between the engaging portion provided in the circuit protection case and the engaged portion provided in the inner case. At this time, the terminal case is positioned by engagement between the engaged portion of the inner case to be positioned and the engaging portion provided in the terminal case. For this reason, the control circuit board in which the control terminal is electrically connected to a predetermined position is shifted from the positional deviation of the position of the control terminal assembled in the terminal case and pre-mounted on the drive circuit board in the circuit protection case. It can be suppressed within a range that can be fixed at a predetermined position of the circuit protection case. Therefore, the trouble of re-fixing the terminal case and the inner case to the circuit protection case can be saved, and the manufacturing efficiency can be improved.
[0017]
In the invention of claim 2, in addition to the effect of the invention of claim 1, the engaging portion of the circuit protection case and the engaging portion of the terminal case are tapered ridges or narrowly engaged with the ridges. Since the engaged portion is the other, the terminal case can be positioned at the foremost position of the protrusion, and therefore the positioning can be performed with high accuracy. . Therefore, the positional shift of the arrangement position of the control terminal assembled in the terminal case and mounted on the drive circuit board in advance in the circuit protection case is a circuit of the control circuit board in which the control terminal is electrically connected to the predetermined position. It can be reliably suppressed within a range that can be fixed at a predetermined position of the protective case.
[0018]
In the invention of claim 3, in addition to the effect of the invention of claim 2, in the inner case, the control circuit chamber in which the control circuit is accommodated, the first drive circuit, the second drive circuit, and the drive circuit in which the heat sink is accommodated Since the partition wall that divides the inside of the circuit protection case is provided in the chamber, heat generation from both the first and second drive circuits is promoted from the drive circuit chamber to the outside of the circuit protection case via the heat sink. The movement from the drive circuit chamber to the control circuit chamber is suppressed.
[0019]
In addition, since the engaged portion of the inner case is provided over the entire length of the partition wall at the tip of the partition wall on the heat sink side, the engagement portion provided in the circuit protection case and the terminal case, By engaging with the joint portion, it is also possible to suppress the movement of relatively high-temperature heat drifting around the heat sink of the drive circuit chamber from the drive circuit chamber to the control circuit chamber. Therefore, the temperature rise of the control circuit chamber can be suppressed, and as a result, the manufacturing cost can be reduced by replacing the electronic components of the control circuit accommodated in the control circuit chamber with those having a low specification temperature and low cost. .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a sectional view showing an example of an embodiment in which the inventions according to claims 1 to 3 are implemented together. The brushless motor 1 shown in this figure is used as a blower fan motor in an automotive air conditioner, and a sirocco fan 3 for blowing air is attached to the tip of a motor shaft 2.
[0021]
A stator 6 is disposed in a housing 5 that rotatably supports the motor shaft 2 via a bearing portion 4. A rotor 7 is disposed on the motor shaft 2. The stator 6 includes a core 6a in which thin metal plates are laminated, and a coil 6b wound around the core 6a. The rotor 7 includes a plurality of permanent magnets 7 a arranged close to the outside of the stator 6, and a yoke 7 b that holds the permanent magnets 7 a and covers the stator 6 and is fixed to the front end side of the motor shaft 2. Yes.
[0022]
A circuit protective case 10 made of synthetic resin is screwed and fixed to a flange portion 5a provided at the lower end portion of the housing 5 with an anti-vibration rubber 8 interposed therebetween. The circuit protection case 10 includes an upper case 11 positioned on the front end side of the motor shaft 2 and a lower case 12 positioned on the rear end side of the motor shaft 2. In the circuit protection case 10, a sensor magnet 13 fixed to the rear end portion of the motor shaft 2 is accommodated. The sensor magnet 13 detects the rotational position of the permanent magnet 7a in cooperation with a Hall element (not shown) mounted on the control circuit board 41.
[0023]
In the circuit protection case 10, a first drive circuit 20 including a switching element 21 that switches a flow path of a drive current flowing through the coil 6 b of the stator 6, and a second drive that supplies the drive current to the switching element 21. A circuit 30 and a control circuit 40 for controlling the rotation of the motor shaft 2 by controlling the current path switching timing of the switching element 21 are also housed.
[0024]
The first drive circuit 20 is formed by mounting a switching element 21 on an aluminum substrate 22 employed as a drive circuit substrate. As the switching element 21, a MOS field effect transistor is employed. The aluminum substrate 22 is assembled integrally with a terminal case 50 made of synthetic resin in advance.
[0025]
The second drive circuit 30 is formed by assembling an electric circuit component such as an electrolytic capacitor 31 to an inner case 32 made of synthetic resin, and is disposed below the heat sink 14 made of aluminum and the first drive circuit 20. Yes. The terminal case 50 is disposed between the heat sink 14 and the inner case 32, and is fixed to the upper case 11 with screws with the inner case 32.
[0026]
The heat sink 14 has heat radiation fins 14a that radiate heat generated from both the first and second drive circuits 20 and 30, particularly heat generated by the switching element 21 of the first drive circuit 20, to the outside of the circuit protection case 10. And is assembled to the upper case 11. The control circuit 40 is formed by mounting electrical circuit components such as a hall element (not shown) and a microcomputer 42 on a control circuit board 41. The control circuit board 41 is disposed below the sensor magnet 13 and fixed to a predetermined position of the upper case 11 with screws.
[0027]
FIG. 2 is a plan view showing the first drive circuit and the terminal case. FIG. 3 is a bottom view showing the state shown in FIG. 2 arranged in the upper case. As shown in FIGS. 2 and 3, six switching elements 21 are surface-mounted on the aluminum substrate 22 of the first drive circuit 20.
[0028]
The terminal case 50 includes a frame-shaped case body 51 that surrounds the peripheral edge of the aluminum substrate 22. Attachment portions 52 for fixing the terminal case 50 to the upper case 11 are provided on the left and right sides of the case main body 51 so as to protrude outward. Each mounting portion 52 is provided with a mounting hole 53 through which a mounting boss portion 11 a protruding from the inner wall surface of the upper case 11 is inserted.
[0029]
The case body 51 of the terminal case 50 is electrically connected to the two drive terminals 61 that electrically connect the first drive circuit 20 and the second drive circuit 30, and the first drive circuit 20 and the control circuit 30. Eight control terminals 62 to be connected, and three connection terminals 63 for electrically connecting the first drive circuit 20 and the terminal pin 15 via the connection bus bar 16 are assembled. The tip of the terminal pin 15 is electrically connected to the coil 6 b of the stator 6. The connecting bus bar 16 includes a U-shaped vibration isolating structure that prevents vibration of the motor shaft 2 from being transmitted to the wiring terminal 63 via the housing 5, the stator 6, and the terminal pin 15.
[0030]
The drive terminal 61, the control terminal 62, and the connection terminal 63 are mounted at predetermined positions on the wiring pattern of the aluminum substrate 22, and the aluminum substrate 22 and the terminal case 50 are assembled together in advance. On the surface of the assembly member 51a of the case main body 51 in which the drive terminal 61, the control terminal 62, and the connection terminal 63 are assembled, an engagement portion 54 that is a narrow engagement groove with a U-shaped cross section is formed on the surface. It is formed along the longitudinal direction of the assembly member 51a.
[0031]
On the inner wall surface of the upper case 11, when the terminal case 50 is disposed at a predetermined position of the upper case 11, the surface of the assembly member 51 a is located at a position located on both sides in the longitudinal direction of the assembly member 51 a of the terminal case 50. Step portions 11b that are substantially flush with each other are provided in a protruding manner. On the surface of both stepped portions 11b, an engaging portion 11c having the same shape as the engaging portion 54 of the terminal case 50 is provided. When the terminal case 50 is disposed at a predetermined position of the upper case 11, the engaging portion 54 of the terminal case 50 is provided. And so as to be substantially in a straight line.
[0032]
FIG. 4 is a plan view showing the second drive circuit. FIG. 5 is a right side view of the device shown in FIG. As shown in FIGS. 4 and 5, two large and small electrolytic capacitors 31, 33, a common mode choke coil 34, and a varistor 35 are assembled in the inner case 32 of the second drive circuit 30.
[0033]
Further, an anode terminal 64 and a ground terminal 65 for receiving power from the on-vehicle power source, and a signal terminal 66 for receiving an external control signal are also assembled. Further, a wiring bus bar 36 for electrically connecting the electrolytic capacitors 31 and 33, the common mode choke coil 34, the varistor 35, the anode terminal 64, and the ground terminal 65 is also assembled. The wiring bus bar 36 is provided with two joint portions 36 a that are joined to the drive terminals 61 assembled to the terminal case 50. The wiring bus bar 36 and the anode terminal 64 are connected via a spring fuse 37.
[0034]
The inner case 32 is configured such that when both electrolytic capacitors 31 and 33 and the common mode choke coil 34 are assembled, these connection terminals come into contact with the wiring bus bar 36. Therefore, a forming process for bending these connection terminals in advance is unnecessary. On the back surface of the inner case 32, cylindrical portions 32b into which the mounting boss portions 11a of the upper case 11 are inserted when the inner case 32 is fixed to the upper case 11 are erected on the left and right sides of the inner case 32, respectively. .
[0035]
The inside of each cylindrical portion 32 a communicates with a screw hole 32 b provided in the inner case 32. On the surface of the inner case 32, screw mounting seats 32c are provided so as to surround the screw holes 32b. In the central portion of the inner case 32, a control circuit chamber 10a (see FIG. 1) in which the control circuit 40 is accommodated, and a drive circuit chamber 10b (in which the first drive circuit 20, the second drive circuit 30, and the heat sink 14 are accommodated). A partition wall 32d that divides the inside of the circuit protection case 10 is erected along the left-right direction of the inner case 32 (see FIG. 1).
[0036]
The partition wall 32d is engaged with the engaging portion 11c of the upper case 11 and the engaging portion 54 of the terminal case 50 at the tip located on the heat sink 14 side with the inner case 32 fixed to the upper case 11. An engaged portion 32e is formed. The engaged portion 32e is a tapered protrusion with a U-shaped cross section, and is formed over the entire length of the partition wall 32d.
[0037]
FIG. 6 is a plan view showing a control circuit board of the control circuit. As shown in FIG. 6, the control circuit board 41 of the control circuit 40 has the same number of through holes 43 through which the eight control terminals 62 assembled in the terminal case 50 are inserted at predetermined positions of the wiring pattern. A through hole 44 through which the signal terminal 44 assembled in the inner case 32 is inserted is provided.
[0038]
FIG. 7 is an explanatory view showing the assembly of the terminal case and the inner case to the upper case. FIG. 8 is a cross-sectional view for explaining the positioning of the inner case, and FIG. 9 is a cross-sectional view for explaining the positioning of the terminal case. As shown in FIG. 7, when the terminal case 50 integrated with the aluminum substrate 22 and the inner case 32 formed with the second drive circuit 30 are assembled to the upper case 11, first, the upper case 11. The heat sink 14 is attached to the mounting hole 11d.
[0039]
Thereafter, the mounting boss 11 a of the upper case 11 is inserted into the mounting hole 53 of the terminal case 50, and the back surface of the aluminum substrate 22 is brought into contact with the lower surface of the heat sink 14. Subsequently, the mounting boss portion 11a of the upper case 11 is inserted into a cylindrical portion 32a erected on the back surface of the inner case 32, and the inner case 32 is inserted into the mounting boss portion 11a from the mounting seat 32c side of the inner case 32. Secure with.
[0040]
By this fixing, the heat sink 14 is pressed against the upper case 11, the aluminum substrate 22 is pressed against the heat sink 14, and the terminal case 50 is fixed to the upper case 11 via the aluminum substrate 22 and the heat sink 14. The heat sink 14 is fixed to the upper case 11 with an adhesive having good thermal conductivity, and the aluminum substrate 22 is fixed to the heat sink 14 with an adhesive having good thermal conductivity.
[0041]
By the way, when the inner case 32 and the terminal case 50 are fixed to the upper case 11, as shown in FIG. 8, the inner case 32 and the engaged portion 32e provided at the tip of the partition wall 32d and the upper The case 11 is positioned by engagement with the engaging portion 11c. At this time, the terminal case 50 is positioned by the engagement of the engaged portion 32e of the inner case 32 to be positioned and the engaging portion 54 of the terminal case 50, as shown in FIG.
[0042]
For this reason, the position shift of the control terminal 62 assembled in the terminal case 50 and pre-mounted on the aluminum substrate 22 in the circuit protection case 10 is shifted, and the tip of the control terminal 62 is passed through the control circuit board 41. Even if the control circuit board 41 is inserted into the hole 43, the control circuit board 41 can be kept within a predetermined range in which the control circuit board 41 can be fixed at a predetermined position of the upper case 11. In addition, even if the position of the signal terminal 66 assembled in the inner case 32 is displaced in the circuit protection case 10, the tip of the signal terminal 66 is inserted into the through hole 44 of the control circuit board 41. It is also possible to keep the control circuit board 41 within a predetermined range in which the control circuit board 41 can be fixed at a predetermined position of the upper case 11.
[0043]
Therefore, the control circuit board 41 can be fixed to a predetermined position of the upper case 11 by fixing the inner case 32 and the terminal case 50 to the upper case 11 once. Therefore, the trouble of re-fixing the inner case 32 and the terminal case 50 to the upper case 11 can be saved, and the manufacturing efficiency can be improved.
[0044]
Further, since the inner case 32 and the terminal case 50 are positioned with reference to the engagement between the engaging portion 11c of the upper case 11 and the engaged portion 32e of the inner case 32, the aluminum case is assembled to the terminal case 50. Displacement position of the drive terminal 61 mounted on the substrate 22 in the circuit protection case 10 and position of the joint portion 36a in the circuit protection case 10 of the wiring bus bar 36 assembled to the inner case 32 Can be suppressed within a predetermined range in which the tip of the drive terminal 61 can be joined to the joint 36a. Therefore, also in this respect, the trouble of re-fixing the inner case 32 and the terminal case 50 to the upper case 11 can be saved, and the manufacturing efficiency can be improved.
[0045]
In addition, the engaging portion 11c of the upper case 11 and the engaging portion 54 of the terminal case 50 are U-shaped and deep engaging grooves, and the engaged portion 32e of the inner case 32 has a U-shaped cross section. The shape is a tapered ridge. For this reason, the inner case 32 and the terminal case 50 can be positioned at the most advanced position of the protrusion, and this positioning can be performed with high accuracy.
[0046]
For this reason, the displacement of the position of the control terminal 62 assembled in the terminal case 50 within the circuit protection case 10 and the position of the signal terminal 66 assembled in the inner case 32 within the circuit protection case 10 are disposed. This positional deviation can also be reliably suppressed within a predetermined range in which the control circuit board 41 can be fixed at a predetermined position of the upper case 11.
[0047]
Similarly, the displacement of the position of the drive terminal 61 assembled in the terminal case 50 in the circuit protection case 10 and the joint of the wiring bus bar 36 assembled in the inner case 32 in the circuit protection case 10. It is also possible to reliably suppress the displacement of the position where the 36a is disposed within a predetermined range in which the tip of the drive terminal 61 can be joined to the joint 36a.
[0048]
In the brushless motor 1, as shown in FIG. 1, the inner case 32 accommodates the control circuit chamber 10 a in which the control circuit 40 is accommodated, the first drive circuit 20, the second drive circuit 30, and the heat sink 14. Since the partition wall 32d for partitioning the inside of the circuit protection case 10 is provided in the drive circuit chamber 10b, heat generated from both the first and second drive circuits 20 and 30 is transmitted from the drive circuit chamber 10b through the heat sink 14. Heat dissipation to the outside of the circuit protection case 10 is promoted, and movement from the drive circuit chamber 10b to the control circuit chamber 10a is suppressed.
[0049]
Moreover, since the engaged portion 32e of the inner case 32 is provided over the entire length of the partition wall 32d at the tip of the partition wall 32d on the heat sink 14 side, the engagement portion 11c of the upper case 11 and the engagement portion of the terminal case 50 are provided. 54 and the engagement of the engaged portion 32e of the inner case 32 can also suppress the movement of relatively high-temperature heat drifting around the heat sink 14 of the drive circuit chamber 10b from the drive circuit chamber 10b to the control circuit chamber 10a. it can.
[0050]
Therefore, the temperature rise of the control circuit chamber 10a can be suppressed, and as a result, the electronic components of the control circuit 40 accommodated in the control circuit chamber 10a are replaced with ones having a low specification temperature and low cost, thereby reducing the manufacturing cost. You can also
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an embodiment of the present invention.
FIG. 2 is a plan view showing a first drive circuit and a terminal case shown in FIG. 1;
FIG. 3 is a bottom view showing the state shown in FIG. 2 in the upper case.
4 is a plan view showing a second drive circuit shown in FIG. 1; FIG.
FIG. 5 is a right side view showing the part shown in FIG.
6 is a plan view showing a control circuit board of the control circuit shown in FIG. 1; FIG.
FIG. 7 is an explanatory view showing the assembly of the terminal case and the inner case to the upper case of what is shown in FIG.
FIG. 8 is a cross-sectional view for explaining positioning of the inner case shown in FIG. 1;
FIG. 9 is a cross-sectional view for explaining the positioning of the terminal case shown in FIG. 1;
FIG. 10 is a cross-sectional view showing an example of a conventional product.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Brushless motor 10 Circuit protection case 10a Control circuit room 10b Drive circuit room 11c Engagement part 14 of upper case (circuit protection case) Heat sink 20 First drive circuit 22 Aluminum board (drive circuit board)
30 Second drive circuit 32 Inner case 32d Bulkhead 32e Engaged part 40 Control circuit 41 Control circuit board 50 Terminal case 54 Engagement part 62 of terminal case Control terminal

Claims (3)

A first drive circuit (20) formed on the drive circuit board (22); a second drive circuit (30) formed on the inner case (32) and electrically connected to the first drive circuit (20); A control circuit (40) formed on the control circuit board (41), a control terminal (62) mounted in advance on the drive circuit board (22) and electrically connected to a predetermined position of the control circuit board (41); A circuit protection case (10) accommodating both the first and second drive circuits (20, 30) and the control circuit (40), and a circuit protection case (10) assembled to the circuit protection case (10) The heat sink (14) for radiating the heat inside the circuit protection case (10) and the control terminal (62) are assembled and integrated with the drive circuit board (22) in advance so as to be integrated with the heat sink (14) and the inner case (32). ) Is placed between A brushless motor comprising a terminal case the drive circuit board is fixed to the circuit protective case (10) (22) which is brought into contact with the heat sink (14) (50) with Nakesu (32),
The circuit protection case (10) and the terminal case (50) are provided with engaging portions (11c, 54), respectively, and the inner case (32) is engaged with both engaging portions (11c, 54), An engaged portion (32e) for positioning the inner case (32) and the terminal case (50) based on the engagement of the circuit protection case (10) with the engaging portion (11c) is provided. Brushless motor. The brushless motor according to claim 1,
The engagement portion (11c) of the circuit protection case (10) and the engagement portion (54) of the terminal case (50) are either a tapered protrusion or a deep engagement groove engaging with the protrusion. One of the brushless motors, wherein the engaged portion (32e) is the other. The brushless motor according to claim 2,
The inner case (32) includes a control circuit chamber (10a) in which the control circuit (40) is accommodated, and a drive in which the first drive circuit (20), the second drive circuit (30), and the heat sink (14) are accommodated. A partition wall (32d) for partitioning the inside of the circuit protection case (10) is provided in the circuit chamber (10b), and the engaged portion (32e) is formed at the tip of the partition wall (32d) on the heat sink (14) side at the partition wall (32d). 32d) A brushless motor provided over the entire length.

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