Abstract: A power tool includes a functional element, a motor, a power supply module, a driver circuit, and a control module. The control module is electrically connected to the driver circuit and configured to output a control signal to the driver circuit to control the driver circuit. The control module is configured to: in the case where the power tool is in a first operation stage, control the driver circuit in a first control mode so that a voltage of the motor varies with a rotor position of the motor in a square wave; and in the case where the power tool is in a second operation stage, control the driver circuit in a second control mode so that the voltage of the motor varies with the rotor position of the motor in a sine wave or a saddle wave.

Abstract: A brushless DC motor control system for a ceiling fan is electrically connected to a brushless DC motor, and includes a first switch, a detection module, a timer, a processing module, and a driving module. The first switch sends a first switch signal to the detection module for detection. The detection module outputs an operating electric potential detection signal to the timer. The timer outputs an operating electric potential timing signal to the processing module, so that the processing module outputs a first control signal and a second control signal to the driving module for controlling the brushless DC motor to change the rotational speed and the rotational direction respectively, increasing the convenience of use.

Abstract: A motor control system includes a direct current (DC) motor and a ripple count circuit. The DC motor includes a rotor induced to rotate in response to a drive current generated by a supply voltage. The rotation of the rotor generates a mechanical force that drives a component. The ripple count circuit includes an active filter circuit and a parasitic pulse cancellation circuit. The active filter circuit is configured to filter the drive current and to generate a pulsed signal containing at least one parasitic pulse. The parasitic pulse cancelation circuit is in signal communication with the ripple count circuit to receive the pulsed signal and to output a ripple count signal based on the pulsed signal. The ripple count signal excludes the at least one parasitic pulse.

Abstract: A motor control device capable of improving damping effects of a motor. In a motor control device, a control switching determination unit determines whether or not a control region of a motor is in a voltage saturation region. A voltage command value generator generates a voltage command value of the motor based on a velocity command value and a velocity of the motor. When the control switching determination unit determines that the control region of the motor is in the voltage saturation region, the voltage command value generator determines a voltage vector angle of an output voltage applied to the motor from a total torque command value and a limit value of the maximum voltage capable of being output to the motor, and generates a voltage command value based on the voltage vector angle.

Abstract: A propulsion system is described that includes an electrical bus, a generator configured to provide electrical power to the electrical bus, a plurality of propulsors configured to provide thrust by simultaneously being driven by the electrical power at the electrical bus, and a controller. The controller is configured to synchronize a rotational speed of an individual propulsor from the plurality of propulsors with a rotational speed of the generator after the individual propulsor has become unsynchronized with the rotational speed of the generator by controlling at least one of the rotational speed of the generator, nozzle area of the individual propulsor, or a pitch angle of the individual propulsor.

Abstract: A motor driver for driving a single coil motor, the motor driver includes: a bridge driver configured for applying a driving signal to the single coil by commuting a motor voltage (Vmot) or a motor current (Imot), supplied to the bridge driver, between terminals (OUT1, OUT2) of the single coil; a controller configured for controlling the commuting of the bridge driver and for setting a preferred value of the motor voltage in function of a preferred operating point; a first voltage regulator configured for regulating the motor voltage or the motor current to the preferred value.

Abstract: The technologies described and recited herein pertain to a permanent magnet motor having multiple voltage taps so that the motor may run in multiple configurations, e.g., a low-range and a high-range, and have multiple optimal operating points.

Abstract: A mobility assistance device and a driving method thereof are provided. The mobility assistance device includes at least one bracket and a driving device which drives the at least one bracket. The driving device includes a brushless direct current (DC) motor, a rotor angle sensor, and a sensing driver. The rotor angle sensor senses the angle of the brushless DC motor. The sensing driver uses a corresponding algorithm to estimate a corresponding angle corresponding to an angle velocity switching of the brushless DC motor. The corresponding angle is used as an angle of the brushless DC motor. The sensing driver drives the brushless DC motor according to the corresponding angle, so that the brushless DC motor provides supporting force to the at least one bracket.

Abstract: An air conditioning apparatus includes an indoor unit and an outdoor unit. The outdoor unit includes a compressor that compresses a refrigerant and a motor drive apparatus that drives the compressor. The motor drive apparatus includes an inverter that converts a direct-current voltage into an alternating-current voltage and a motor that operates on the alternating-current voltage from the inverter. The motor includes six stator windings that are each openable at both ends. The motor drive apparatus further includes a connection state switching unit that includes a function of switching a connection state of the six stator windings of the motor among at least four types of connection states.

Abstract: A motor control apparatus includes: an excitation unit configured to excite a plurality of excitation phases of each of a plurality of motors that include first to Nth motors and a control unit configured to control the excitation unit so as to perform detection excitation processing for sequentially exciting the plurality of excitation phases for each excitation cycle during each excitation period, regarding each of the first to Nth motors, and thereby detect rotor positions of the respective first to Nth motors. When detecting rotor positions of the respective first to Nth motors, the control unit delays a start timing of the detection excitation processing of at least one motor out of the first to Nth motors relative to a start timing of the detection excitation processing of another motor by a period shorter than the excitation period.

Abstract: A motor control apparatus configured to convert an input power supplied from a power supply to an output alternating-current power having a predetermined voltage and a predetermined frequency is provided. The motor control apparatus includes an inverter circuit configured to supply the output alternating-current power to a motor, and is configured to perform a control to suppress an amplitude of a first harmonic component that occurs synchronously with a rotation rate of the motor in a power input into the motor to be lower than or equal to a predetermined value and to suppress an amplitude of a second harmonic component that occurs in an electromagnetic exciting force of the motor at a same frequency as the first harmonic component to be lower than the amplitude of the second harmonic component in a case of the amplitude of the first harmonic component being suppressed to a minimum.

Abstract: An apparatus for starting operation of a motor of an implantable blood pump including a memory storing one or more default parameters for at least one of controlling and monitoring the startup operation. A processor operatively coupled to the motor is included, the processor is configured to: commence the startup operation based on the one or more default parameters; detect an error during the startup operation; adjust at least one of the one or more default parameters in response to the detected error; store the at least one adjusted parameter in the memory; and commence subsequent startup operations based at least in part on the at least one adjusted parameter.

Abstract: A fan motor stopping apparatus includes a conversion circuit that converts alternating-current voltage supplied from an alternating-current power supply into direct-current voltage, a smoothing capacitor that is connected to a fan motor included in an air conditioner and smooths the direct-current voltage from the conversion circuit, a voltage detection circuit that detects a voltage across the smoothing capacitor, and a fan motor shutdown circuit that suspends the fan motor in operation when the voltage detection circuit detects a voltage less than or equal to a threshold that is preset for suspending the operation of the fan motor.

Abstract: An electric propulsion system for a vertical take-off and landing (VTOL) aircraft, the electric propulsion system including an electrical motor having a stator and a rotor. The electric propulsion system may include a main shaft possessing at least one shoulder on an outer surface of the main shaft. The electric propulsion system may include a gearbox assembly comprising a sun gear that is concentrically aligned with the main shaft at least one planetary gear that interfaces with the sun gear. The electric propulsion system may include a planetary carrier, wherein a center of the planetary carrier is concentrically aligned with the main shaft. The electric propulsion system may include a propeller flange assembly that travels through the rotor, and an axial buttress positioned in the at least one shoulder located on the main shaft.

Abstract: In one aspect, a movable barrier operator system is provided that includes a motor configured to be coupled to a movable barrier. The motor has a power rating indicative of a minimum power to be supplied to the motor in order for the motor to move the movable barrier. The system further includes an external power supply configured to connect to an electrical outlet. The external power supply has a plurality of outputs each having a power rating indicative of a maximum power the output supplies, the output power rating being less than the motor power rating. The movable barrier operator system includes combiner circuitry configured to combine power from the outputs of the external power supply and provide the combined power to the motor. The system further includes a monitoring circuit configured to detect a fault condition of any of the outputs of the external power supply.

Abstract: An electric motor system includes a battery, an inverter, an electric motor, a zero-phase switching arm and a control unit. The inverter converts DC power output from the battery into three-phase AC power and outputs the three-phase AC power to the electric motor. A rotor of the electric motor rotates by the three-phase AC power output from the inverter. A neural point of the electric motor is connected to the zero-phase switching arm. A zero-phase current flowing through respective windings of the electric motor is adjusted by switching of the zero-phase switching arm. By this means, in the electric motor system, torque is generated at the rotor also using the zero-phase current as well as a three-phase AC current flowing through the respective windings.

Abstract: A three-phase/two-phase conversion unit 43 generates a composite vector i?? of three-phase AC currents based on AC currents iu, iv, and iw. An electrical angle calculation unit 44 outputs the electrical angle of the composite vector i?? with reference to the U-phase AC current iu. A quadrant calculation unit 45 obtains which quadrant of the first to sixth quadrants partitioned in advance the acquired electrical angle corresponds to, confirms whether the composite vector i?? passes through the set quadrant, and outputs quadrant information thereof. A failure detection unit 47 determines whether the composite vector i?? has rotated from the first quadrant to the sixth quadrant, and when there is a quadrant that has not been passed, considers that it is a failure state, specifies a failure part of the switching element from the relationship between the electrical angle and the failure part, and outputs failure information to a PWM signal generation unit 42.

Abstract: Disclosed embodiments include a system and method of acquiring operating parameter data of a motor system that includes an electric motor. The motor system may be provided as a component of a fan. An embodiment includes recording states of operating parameters during operation of the motor system, wherein the operating parameters include a basic parameter and at least one additional parameter; determining a state-change event of the basic parameter based on a recorded state of the basic parameter; recording a state of the additional parameter upon detection of the state-change event of the basic parameter; linking the recorded state of the additional parameter to the detected state-change event; and storing the recorded state of the additional parameter linked to the detected state-change event.

Abstract: A power tool may include an end effector configured to enable a fastener to be applied by the power tool via a fastening cycle, a power unit, a drive assembly configured to apply drive power to the end effector responsive to application of input power thereto, and a motor configured to supply the input power to the drive assembly selectively based on operation of a power control assembly that controls coupling of the motor to the power unit. The drive assembly includes a clutch configured to interrupt application of the drive power at a target torque. The power control assembly may be configured to adaptively change speed of the motor in response to the power tool reaching a predefined torque value that is less than the target torque during the fastening cycle.

Abstract: The present disclosure discloses a servo motor and an encoder calibration method. The encoder calibration method includes: calculating a gain error, an offset error and a phase error, by an error calculation block, according to a first signal and a second signal output by an encoder; calculating at least one gain calibration parameter, at least one offset calibration parameter and at least one phase calibration parameter, by the error calibration block, according to the gain error, the offset error and the phase error; and calibrating sequentially, by the encoder, the gain, the offset and the phase of the first signal and the second signal according to the at least one gain calibration parameter, the at least one offset calibration parameter and the at least one phase calibration parameter, wherein performing at least one gain calibration and offset calibration after the phase calibration is completed.