Abstract: An inverter-converter system includes a DC source, a DC to DC boost converter, a DC link capacitor, an inverter circuit, a variable speed electric machine, and a controller. The DC to DC boost converter receives an input DC voltage from the DC source. The inverter circuit converts the variable boosted voltage to an AC voltage to drive the variable speed electric machine. The controller senses a plurality of parameters from the variable speed electric machine, and controls the DC to DC boost converter to boost up the input DC voltage to a variable output voltage based on the plurality of parameters and/or the voltage (or load) needed by the variable speed electric machine. The design of the inverter-converter system can achieve an electrical efficiency and cost savings for the overall system.

Abstract: According to one embodiment, a semiconductor device includes external terminals supplied with the pair of voltage signals based on a detection result of a resolver through first and second input resistances, respectively, an operation amplifier configured to amplify a potential difference between the pair of the voltage signals supplied to the external terminals, a feedback resistance disposed between an output terminal of the operation amplifier and one of two input terminals thereof, switches disposed between the two input terminals of the operation amplifier and the external terminals, respectively, and a short-circuit failure detection circuit configured to detect whether or not a short-circuit failure has occurred in the resolver based on a voltage level of each of the external terminals in a state where the switches are in an off-state.

Abstract: An adapter for a power tool including a housing, a tool-side connector, and a battery-side connector in electrical communication with each other. The tool-side connector is configured to couple to a power tool, and the battery-side connector is configured to couple to a battery pack. The adapter also includes a communication interface configured to couple with an external device, and a controller. The controller is configured to determine a state of the power tool, operate in a data transmission mode when the power tool is in the idle state, operate in a pass-through mode when the power tool is in the active state, and switch between the data transmission mode and the pass-through mode based on the state of the power tool.

Abstract: A door opening/closing device includes: a motor; and a control unit that is configured to control a rotation rate of the motor by pulse-width modulation (PWM) control. The door opening/closing device opens and closes a door of a vehicle with power of the motor. The control unit is configured to perform the PWM control on the motor at a PWM frequency set so as to deviate from a resonance point of an installation body on which the motor is installed.

Abstract: A method of and a system for controlling the regenerative braking of a vehicle includes initiating a regenerative braking mode in response to an initiating control input to an accelerator of the vehicle, the initiating control input comprising a reduction in the degree of actuation of the accelerator of the vehicle, modifying a level of regenerative braking in the regenerative braking mode in response to at least one of a further reduction in the degree of actuation of the accelerator, application of a brake of the vehicle, application of a clutch of the vehicle, and a change of gear of the vehicle, and maintaining a modified level of regenerative braking after the additional control input has been terminated.

Abstract: A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j - F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ?0 is a predetermined angular frequency and j is the imaginary unit.

Abstract: A controller for controlling a multiphase brushless direct current (BLDC) motor is described. The controller may be configured to determine that the multiphase BLDC motor is operating in a phase delay state in response to determining that an indication of a shunt current for the multiphase BLDC motor satisfies a shunt current threshold and determine that the multiphase BLDC motor is operating in a phase advance state in response to determining that a set of phase-to-ground voltages for the multiphase BLDC motor does not indicate a zero-crossing point. The controller may further be configured to selectively energize each phase of the multiphase BLDC motor based on whether the multiphase BLDC motor is operating in the phase delay state or phase advance state.

Abstract: A vibration conformance compensation device includes a linear motor including a vibrator and a coil, a signal generator connecting with the linear motor electrically and outputting a drive signal for driving the linear motor to vibrate, a working parameter feedback module, a processing module connecting having a target vibration state value which is set in the linear motor in advance for comparing the real-time vibration state parameters of the linear motor with the target vibration state value to obtain the comparison result, and a signal conditioning module connecting with the processing module and the signal generator electrically and adjusting the drive signal in accordance with the comparison result to make the vibration state of the linear motor consistent with the target vibration state.

Abstract: A multi-pulse transformer with multiple taps provides a constant magnitude voltage output to a variable speed chiller's compressor motor over a range of input voltages. The 3-phase transformer includes primary windings and a plurality of secondary windings. The secondary windings are electromagnetically coupled with the associated primary winding. The primary windings include taps for receiving multiple input AC voltages and the secondary windings have a single output terminal for supplying a predetermined output voltage which, after rectification produces a DC multi-pulse waveform for powering a DC link of a variable speed drive. Alternatively the 3-phase transformer includes multiple taps on the secondary windings. Each of the primary windings has a terminal for receiving an input AC voltage. The taps of the secondary windings provide an output voltage that is converted to a multi-pulse waveform for powering a DC link of a variable speed drive.

Abstract: Controllers for controlling hybrid motor drive circuits configured to drive a motor are provided herein. A controller is configured to drive the motor using an inverter when a motor commanded frequency is not within a predetermined range of line input power frequencies, and couple line input power to an output of the inverter using a first switch device when the motor commanded frequency is within the predetermined range of line input power frequencies.

Abstract: A method for synchronizing an MDPS motor and a motor position sensor may include: sequentially aligning, by a controller, a rotor of the MDPS motor by sequentially applying preset three-phase current pulses to the MDPS motor, the three-phase current pulses corresponding to one electrical-angle cycle of the rotor of the MDPS motor, and detecting an actual rotational position of the aligned rotor through the motor position sensor; determining a zero point rotational position of the rotor based on the actual rotational position; determining a reference rotational position of the rotor based on the actual rotational position and the number of pole pairs in the MDPS motor, and determining an offset rotational position of the rotor based on the actual rotational position and the reference rotational position; and correcting the zero point rotational position by adding the offset rotational position to the zero point rotational position.

Abstract: A method and apparatus for controlling regeneration for a motor. An instantaneous voltage provided by a power supply to the motor is identified using a voltage signal received from a voltage sensor. A new average voltage is computed for the motor using the instantaneous voltage, a previously computed average voltage, and a weight factor for the instantaneous voltage. A difference between the new average voltage and the instantaneous voltage is compared to a selected threshold to determine whether a regeneration condition exists. Operation of the motor is controlled such that a duty cycle of the motor does not decrease in response to a determination that the regeneration condition exists.

Abstract: A power control system for a hybrid vehicle is provided. The system includes a rechargeable battery, a first motor that is connected to a driving wheel of the vehicle, and a second motor that is connected to the driving wheel of the vehicle. A first inverter is connected to the first motor and a second inverter is connected to the second motor. A converter has a first side connected to the battery and a second side connected to the first inverter. A neutral switch is connected between the first side of the converter and a neutral point of the first motor. A controller executes an on/off of the switch based on whether the first motor is operated and required power of the vehicle.

Abstract: The invention relates to an arrangement for the damped bearing of a rotor shaft (1) of an electric machine. The invention also relates to an electric machine comprising a rotor shaft (1) and at least one such arrangement. The invention further relates to a method for the damped bearing of a rotor shaft (1) of such an electric machine. In order to provide an alternative for the damped bearing of a rotor shaft (1), it is proposed that the arrangement has a bearing unit (2), which can be arranged between the rotor shaft (1) and a housing (3) of the electric machine, and a damping element (4), which can be arranged between the bearing unit (2) and the rotor shaft (1) or between the bearing unit (2) and the housing (3), wherein the damping element (4) comprises a mesh of metal wire (5).

Abstract: A system in which the operation of an electric motor is controlled by electronically controlled switches. The system includes the motor having a run winding and a start winding, a heating component, and a motor control subsystem. A control unit closes a first switch to energize the run winding, closes a second switch to energize the start winding, determines based on an amplitude and a lag time of a current flowing through the motor whether the motor has started and is running normally, and if so, opens the second switch to de-energize the start winding and closes a third switch to activate the heating component. The control unit determines whether the motor has started and is running normally by comparing the real time amplitude and lag time of the current to a plurality of stored amplitudes and lag times associated with different operating conditions.

Abstract: A system includes a variable-speed drive configured to drive a motor, wherein the variable-speed drive is communicatively coupled to first and second resonant controllers. The system also includes a first transformer coupled to the variable-speed drive and an umbilical cable, wherein the first transformer increases a first voltage output by the variable-speed drive. The system further includes a second transformer coupled to the umbilical cable and the motor, wherein the second transformer decreases a second voltage output by the first transformer. The first resonant controller compensates for a harmonic order of the system by adjusting a magnetizing current used to control an operation of the variable-speed drive based on a modeled resonance frequency of the system. The second resonant controller compensates for the harmonic order of the system by adjusting a torque current used to control the operation of the variable-speed drive based on the modeled resonance frequency.

Abstract: A braking apparatus according to one embodiment of the present invention is a braking apparatus for use in an electrical motor, and comprises a braking unit which locks the electrical motor in position, a voltage detection unit which detects a voltage applied to the braking unit, and an observing unit which recognizes a voltage variation pattern and, based on the voltage variation pattern, observes the released and actuated states of the braking unit.

Abstract: The invention relates to a method for generating control signals for managing the operation of a synchronous motor with one or more permanent magnets (1) comprising a stator (2), the stator comprising a number P of phases (3, 4, 5), a rotor, the rotor comprising said permanent magnet or magnets, a switching module (6) provided with a plurality of switches (K1-K6), a number N of Hall-effect sensors sensitive to a rotating electromagnetic field induced by said permanent magnet or magnets, N being no lower than 2 and strictly lower than P, the method comprising a step of acquiring status information transmitted by the sensors (9, 10) and a step of estimating at least one piece of complementary information on the basis of status information transmitted by the sensors (9, 10), the complementary information characterizing the status variation of at least one virtual sensor.

Abstract: To provide a motor control device capable of properly compensating the fluctuation in inverter output voltage during a dead time. The motor control device is for an inverter including switching elements composing upper and lower arms to convert a direct-current voltage to an alternating-current voltage and apply the alternating-current voltage to a motor thereby controlling a current of the motor to be a current target value, the motor control device including a dead time compensation unit that compensates fluctuation in inverter output voltage during a dead time with each switching between the upper and lower arms by a dead time compensation voltage, wherein the dead time compensation unit acquires an input parameter that determines a polarity of motor current during the dead time in a half-cycle of a fundamental wave of the motor current, and varies the dead time compensation voltage according to magnitude of the input parameter.

Abstract: A method for detecting a fault in an electrical machine, e.g., a synchronous motor, a motor control unit for controlling an electrical machine, and a motor arrangement having such a motor control unit are disclosed. According to the method, rotation angle data are determined, which data are dependent on a rotation angle of a rotor of the electrical machine in the absence of the fault. In addition, additional data are determined and allow conclusions to be drawn on the fault. A fault is detected if the rotation angle data satisfy a first criterion and the additional data satisfy a second criterion.