5370 results about "Brushless motors" patented technology

A permanent magnet DC brushless motor control assembly permits a user to select the permanent magnet DC brushless motor operating characteristics by selecting appropriate control circuits to interface with the motor. The assembly includes a permanent magnet DC brushless motor, a commutator electrically coupled to the motor, and at least one control module electrically coupled to the commutator, to control operating characteristics of the permanent magnet DC brushless motor.

For the present invention, under various running speeds statuses, the voltage supplied to the DC brushless motor is relatively increased or decreased on the basis of the internal setting of the motor drive control device according to the increased or decreased rotational output speed, so as to prevent the shortcoming of too much variation of the input impedance caused by the inductive reactance of the winding accordingly changed when the speed of the DC brushless motor is changed, specifically, to prevent the shortcoming of unable producing required torque resulting from the increased inductive reactance caused by increasing the rotational speed which makes the current value become too low when input by the original working voltage.

A robotic device has a base and at least one finger having at least two links that are connected in series on rotary joints with at least two degrees of freedom. A brushless motor and an associated controller are located at each joint to produce a rotational movement of a link. Wires for electrical power and communication serially connect the controllers in a distributed control network. A network operating controller coordinates the operation of the network, including power distribution. At least one, but more typically two to five, wires interconnect all the controllers through one or more joints. Motor sensors and external world sensors monitor operating parameters of the robotic hand. The electrical signal output of the sensors can be input anywhere on the distributed control network. V-grooves on the robotic hand locate objects precisely and assist in gripping. The hand is sealed, immersible and has electrical connections through the rotary joints for anodizing in a single dunk without masking. In various forms, this intelligent, self-contained, dexterous hand, or combinations of such hands, can perform a wide variety of object gripping and manipulating tasks, as well as locomotion and combinations of locomotion and gripping.

A submergible pumping unit for raising viscous fluids from a well is driven by an electronic drive and control system, a first portion of which is located above the well, and a second portion of which is coupled to the submergible pumping unit. The drive and control system includes a power supply circuit located above the well for converting AC power from a source to DC power having current and voltage levels. The DC power is transmitted to the pumping unit via a two-conductor DC bus cable. The pumping unit includes a switching circuit which receives the DC power for driving a submergible motor, such as a permanent magnet brushless motor. The speed of the motor, and of a pump coupled thereto, is proportional to the voltage of the DC power applied to the pumping unit. The pump is preferably a progressive cavity pump, and the drive and control circuitry provides sufficient torque to start the pump from a static condition. A control circuit is provided for transmitting configuration and desired flow rate and speed data to the power supply.

A change-over device of pull cord control and wireless remote control for a DC brushless-motor ceiling fan is to have a driver installed in a ceiling fan basic body, and the driver has a detecting unit for detecting whether or not a connector positioned in a hanging bell is connected with a wireless control switch unit so as to control the blades of the DC brushless-motor ceiling fan to rotate by pull cord control or by wireless remote control. Further, the connector is installed inside the hanging bell; therefore, when the DC brushless-motor ceiling fan is to be additionally provided with a wireless control switch unit, it is convenient and safe in installation.

A driving apparatus for a DC brushless motor of a ceiling fan is provided. By setting at least one coder and one sensor outside the DC brushless motor, the driving apparatus can sense the position of magnetic poles of the motor for driving the motor. Meanwhile, a controller set with the motor stores the rotation speed of the motor before being turned off by detecting the turn-off time of a turn-on / off signal.

A motor, fan and cyclonic separation apparatus arrangement for a vacuum cleaner comprising: a motor coupled to a fan for generating air flow; and a cyclonic separation apparatus located in a path of the air flow generated by the fan. The cyclonic separation apparatus comprises: a plurality of cyclones each with an air inlet port and an air outlet port; and a cooling air flow path. The motor comprises a permanent magnet brushless motor, a switched reluctance motor or a flux switching motor. The fan has an outer diameter the same or less than the diameter of the motor. The plurality of cyclones, the motor and the fan are arranged in a circular array about a central axis of the cyclonic separation apparatus. The arrangement comprises a baffle for directing air flow from the fan out of the circular array. The motor is located in the cooling air flow path.

A plurality of coils wound around a stator magnetic-pole core are connected together and connected to output wires by use of a bus bar. The bus bar having a generally cylindrical body portion is disposed at one axial end of the stator magnetic-pole core, around which the coils are wound such that clearances are formed within magnetic-pole core slots, with an axial clearance formed between the bus bar and the coils. The body portion has such a radial dimension that at least a portion of the clearances within the magnetic-pole core slots is left uncovered. Air holes are formed in the motor housing on opposite sides of the stator magnetic-pole core to thereby form cooling air passages extending through the magnetic-pole core slots.

The invention discloses a robot which comprises a robot body and a remote interactive platform. The remote interactive platform is communicated with the robot body through a wireless communication network platform, the robot body comprises a moving device and a function module which is arranged above the moving device, the moving device comprises mechanical legs, a base plate, direct current brushless motors, direct current brushless motor drivers, driving wheels and universal wheels, the base plate is arranged at lower ends of the mechanical legs, the direct current brushless motors are arranged in the base plate, the driving wheels are connected with the direct current brushless motors, and the function module comprises a multiple-degree-of-freedom mechanical waist, a mechanical neck, a mechanical head, mechanical arms and mechanical hands. The robot is exquisite in structure, flexible in movement and high in simulation degree, portions of the robot can perform multiple-degree-of-degree movement, and the robot supports wireless remote control and information transmission and is capable of well achieving various functions of route planning, autonomous navigation, face recognition, man-machine conversation, guests receiving and the like.

In an electric motor, such as a DC brushless motor or the like, having a permanent magnet in a rotor, each magnetic pole is formed of three permanent magnets, and the permanent magnets are made of at least two kinds of magnetic materials represented by ferrite magnet and rare-earth magnet. Thus, in a permanent magnet rotor type electric motor, a reluctance torque and a magnetic flux density can be selectively established, and cost is reasonable, corresponding to the quality.

An electric power tool includes a housing, a brushless motor, an output shaft, and a motor driver circuit. The housing defines an axial direction. The brushless motor is accommodated in the housing and having a drive shaft. The output shaft extends in a direction generally perpendicular to the drive shaft. The motor driver circuit is accommodated in the housing for driving the brushless motor. The housing has a cylindrical shape and has a part functioning as a grip portion.

A powered strength trainer includes: a motor of a load element being a DC or brushless motor; a controller, provided for users to adjust current and signal of the motor through a microcomputer control panel, and control the torque, vibration frequency and amplitude of the motor, such that the motor can produce a pulling force, a resistance and a vibration force at the same time, and a vibration waveform can be selected as needed, and a movement path sensor is provided for feeding back a position and determining a positive and negative rotation, and a curved load control is used for compensating a load current appropriately, and allowing users to obtain a smooth and real-world setting. A planar spiral spring drives a winch to rewind the steel wire to prevent the steel wire from falling out during a power disconnection or a power failure.

The invention relates to the technical field of four-rotor aircrafts, in particular to a small four-rotor aircraft control system and method based on an airborne sensor. The small four-rotor aircraft control system based on the airborne sensor comprises an inertia measurement unit module, a microprocessor, an electronic speed controller, an ultrasonic sensor, an optical flow sensor, a camera, a wireless module and a DC brushless motor. By merging the information of a light and low-cost airborne sensor system, the six-DOF flight attitude of the aircraft is estimated in real time, and a closed-loop control strategy comprising inner-loop attitude control and outer-ring position control is designed. Under the environment without a GPS or an indoor positioning system, flight path control and aircraft formation control based on the leader followed strategy over the rotorcraft are achieved through the airborne sensor system and the microprocessor, wherein the flight path control comprises autonomous vertical take-off and landing, indoor accurate positioning, autonomous hovering and autonomous flight path point tracking. According to the small four-rotor aircraft control system and method, a reliable, accurate and low-cost control strategy is provided for achieving autonomous flight of the rotorcraft.

The invention relates to a three-layer airborne flight control device for a micro four-rotor aerial vehicle, and belongs to the technical field of micro aerial vehicles. A navigation control layer consists of a navigation controller, an inertial measurement unit, a micro laser distance measuring sensor, a micro vision sensor and a wireless fidelity (WiFi) wireless network; an attitude control layer consists of an attitude controller, a gyroscope, an accelerometer, a magnetometer, a pressure sensor, an ultrasonic sensor, a remote controller and receiver unit and a ZigBee wireless communication unit; and a motor speed regulation control layer consists of four brushless motor speed regulators and four actuator units. The attitude controller is added, so that the whole flight device becomes intelligent, can perform autonomous navigation positioning, can avoid obstacles, is independent of manual operation of a remote controller, and becomes an intelligent robot in the real sense.

A power tool includes a housing, a brushless motor, and a cover member. The housing has an air intake hole and an air exhaust hole formed therein, the housing having an inner surface. The brushless motor has an outer surface disposed in the housing, a first endface near the air intake hole, and a second endface near the air exhaust hole. The cover member covers at least one of the first endface and the second endface for preventing dust from entering the brushless motor. The inner surface of the housing and outer surface of the brushless motor define a circulation path providing communication between the air intake hole and the air exhaust hole.

A position sensor-free double closed-loop speed regulation control method for a brushless DC motor comprises the following steps: (1) initializing functional modules and peripherals; (2) opening AD (Analog-Digital) interruption and protection interruption; (3) detecting the start key of the motor, judging whether to start the motor, if yes, executing the next step, and if not, continuing to execute the step; (4) starting voltage detection, judging whether the voltage of a main circuit is larger than starting voltage, if yes, executing the next step, and if not, returning to the step (3); (5) entering a motor starting subprogram and beginning operating the motor; (6) entering a double closed-loop speed regulation subprogram, and regulating the rotational speed and the current of the motor according to voltage value; and (7) detecting a motor brake key, judging whether to press the key, if yes, entering a motor brake subprogram, and if not, returning to the step (3). The method provided by the invention overcomes the defects of larger size, low rotational speed accuracy and the like of the conventional motor controller, can accurately control different rotational speeds of the motor, and can simultaneously realize counter electromotive force zero-cross comparison position sensor-free reversing and Hall position signal reversing.

A low inductance electrical machine which may be used as an alternator or motor with low armature inductance is disclosed. Arrangements of complementary armature windings are presented in which the fluxes induced by currents in the armature windings effectively cancel leading to low magnetic energy storage within the machine. This leads to low net flux levels, low core losses, low inductance and reduced tendency toward magnetic saturation. Separately excited field arrangements are disclosed that allow rotor motion to effect brushless alternator or brushless motor operation. An exemplary geometry includes a stator including two toroidal rings and a concentric field coil together with a rotor structure separated from the stator by four air gaps. An alternate embodiment allows for counter-rotation of two rotor elements for use as a flywheel energy storage system in which the external gyroscopic effects cancel.

The invention provides a technique of facilitating a coil winding work by continuously winding coils in the same direction, in a stator in which a plurality of coils constituting a coil group of the same phase are respectively arranged so as to include positions at which phases of induction voltage are different, whereby coil groups of three phases are disposed in a ring shape. A stator (102) of the invention has a structure in that a pair of coils (21U1, 21U4) and coils (21U2, 21U3) in which phases of induction voltage are identical in a plurality of coils (21U1 to 21U4) constituting a U-phase coil group (21U) are set as different divided groups, the respective coils (21U1, 21U4) and coils (21U2, 21U3) in the divided group are continuously wound in the same winding direction while arranging crossovers (26U1, 26U3) respectively between the coils (21U1, 21U4) and between the coils (21U2, 21U3), the divided groups are connected in parallel, and a V phase and a W phase are executed in the same manner, whereby lead wires of three-phase coil groups (21U, 21V, 21W) are star connected.

A motor driving apparatus includes an inverter circuit for converting an output voltage of a power supply into a three-phase AC and outputting the same to the brushless motor, a rotor position estimation unit for estimating a rotor position of the brushless motor, and an inverter control unit for controlling the inverter circuit so that the brushless motor is driven by a current based on the estimated rotor position. The inverter control unit determines an advance angle of the current supplied to the brushless motor with respect to the estimated rotor position so as to minimize a deviation between a command rpm and an actual rpm. Therefore, it is possible to perform stable weak field control for the brushless motor, independently from the input voltage of the inverter circuit, without using predetermined control variables such as table values.

It is an object of the present invention to provide a technique to increase efficiency of the output torque of the blushless motor to drive a power tool. A representative power tool may comprise a tool bit, a brushless motor to drive the tool bit, a battery to operate the brushless motor and a control device. The control device may operate the brushless motor by means of the battery. The control device may include an advance angle controlling section to control an advance angle of the brushless motor. According to the present teachings, the advance angle of the brushless motor may be determined based upon indexes that reflect working condition of the tool bit when the brushless motor is under the operation. By reflecting the working condition of the tool bit to the determination of the advance angle of the brushless motor, the brushless motor can be operated with higher efficiency under the various working condition such as a hard joint operation and a soft joint operation.

A brushless motor for a vehicle air conditioner has a motor holder having an accommodation portion, a stator having a center piece fastened to a bottom of the accommodation portion and a core on which a winding is wound, and an exciting circuit disposed below the bottom to supply an exciting current to the winding. A terminal of the exciting circuit is upwardly extended to an upper side of the core through a through hole formed in the bottom and a terminal accommodation hole formed in the center piece to be connected to the winding. Liquid having entered the accommodation portion is restricted from falling through the through hole of the bottom by an O-ring disposed to surround the through hole and is drained through a drain opening formed in the bottom. As a result, a connection portion between the terminal and the winding and the exciting circuit are restricted from making contact with liquid.

The stator core of a motor comprises an annular back core, and a plurality of tees created separately from the back core and secured onto the inner periphery of the back core. A stator coil is wound on each of the tees by a distributed or concentrated winding method. The stator core and stator coil are formed by molding.

The invention discloses a flying robot used for detecting transmission line insulator in the field of aircraft control and image transmission technique. The technical proposal is that the flying robot used for detecting the transmission line insulator consists of a three-axis aircraft or four-axis aircraft, a flying control system and an objective recognition system; the power part of the three-axis aircraft consists of three pairs of airscrews, three coaxial motors and three supporting arms; the power part of the four-axis aircraft consists of 4 direct-drive brushless motors and four airscrews; the flying control system consists of an on-board self-control system and a ground station control system; the objective recognition system consists of on-board mission load and a ground image processing system. By installing a precise navigation system on the flying robot, the flying robot exactly flies in the space above the insulator to be detected; by adopting the image gaining and transmission system, the zero-value insulator is exactly detected, the labor intensity is lightened, and the safety of the detection personnel is improved during the detection process.

A second bracket part for holding a resolver stator of a resolver as position detecting means is inserted in an opening hole in a first bracket part. An expanded part formed in the second bracket part and the opening hole in the first bracket hole are connected to each other with a fixing member. A through hole in which the fixing member for the expanded part is inserted has a circular arc shape. By reducing the fixing strength of the fixing member, the second bracket part can be made movable in the circumferential direction.

According to an aspect of the present invention, there is provided a power tool including: a brushless motor; switching elements that drive the brushless motor; a circuit board on which the switching elements are mounted; a transmission portion that transmits a driving force of the brushless motor; and a housing that houses the brushless motor, the switching elements, the circuit board and the transmission portion therein, wherein the switching elements include semiconductor elements each having terminals on a bottom surface thereof, and wherein the switching elements are surface mounted on the circuit board.

It is an object of the present invention to provide a technique to increase efficiency of the output torque of the blushless motor to drive a power tool. A representative power tool may comprise a tool bit, a brushless motor to drive the tool bit, a battery to operate the brushless motor and a control device. The control device may operate the brushless motor by means of the battery. The control device may include an advance angle controlling section to control an advance angle of the brushless motor. According to the present teachings, the advance angle of the brushless motor may be determined based upon indexes that reflect working condition of the tool bit when the brushless motor is under the operation. By reflecting the working condition of the tool bit to the determination of the advance angle of the brushless motor, the brushless motor can be operated with higher efficiency under the various working condition such as a hard joint operation and a soft joint operation.

A control apparatus for an electrical power steering apparatus whereby a high output, small motor can be achieved, variation in the relative magnetization and coil positions and position detection precision requirements can be alleviated, steering feeling is improved, and apparatus cost is reduced. In a control apparatus for an electrical power steering apparatus for controlling a motor applying steering assistance force to a steering mechanism based on a current control value calculated from the current of a dc motor or brushless motor and a steering assistance control value calculated based on steering torque occurring at the steering shaft, torque ripple of the motor is suppressed to 10% or less.

A brushless motor comprising a housing; a drive shaft rotatably held by the housing; a stator disposed on said housing and having a plurality of coils which are arranged to surround the drive shaft; a yoke secured to the drive shaft to rotate therewith; a plurality of magnets that are held by the yoke in a manner to surround the stator keeping a given space therebetween; an electric parts protecting case on which the housing is mounted; a drive circuit installed in the case for energizing the coils of the stator, the drive circuit including a plurality of switching elements each changing the direction of electric current flowing in the corresponding coil of the stator; a control circuit installed in the case for controlling operation of the switching elements to adjust a rotation speed of the drive shaft; electric connectors for connecting the drive and control circuits; and a heat sink held by the case, the heat sink including a hidden portion exposed to an interior of the case and a plurality of heat radiation fins exposed to the outside of the case, the hidden portion having the switching elements attached thereto. The drive circuit and control circuit are arranged on respective substitutes which are arranged at different positions in the electric parts protecting case. The drive and control circuits are connected through electric connectors.