Abstract: Embodiments of a bidirectional low voltage power supply (LVPS) with a single pulse width modulator and method are generally described herein. In some embodiments, the bidirectional LVPS may include a first converter arranged to provide power from an input power source to a load and a second converter arranged to selectively recycle power from the load at an output of the first converter back to the input power source. Control circuitry may include switching circuitry that may be configured to select either the first power converter or the second power converter for reception of an output of a single PWM.

Abstract: An object is to provide a permanent magnet motor controller capable of suppressing the rotary bending vibration that occurs in the permanent magnet motor effectively with simple configuration. A permanent magnet motor controller uses the dq coordinate conversion. A dq target current setting part adds the current component (i*da) that cancels the magnetic attractive force acting in the radial direction of the rotational shaft of the rotor of the permanent magnet motor to the d-axis target current value, whereby the eccentricity of the rotational shaft of the rotor is reduced.

Abstract: A system and method controls a rotor angular speed of an induction motor by first sensing an operation condition of the induction motor to produce measured signals, which are transformed by applying a state transformation to an induction motor model to produce a transformed induction motor model. Transformed state estimates of the transformed induction motor model are produced based on the measured signals. An inverse of the state transformation is applied to the transformed state estimates to produce state estimates of the induction motor model, which are then used to determine control input voltages for the induction motor, based on the state estimates, to control the rotor angular speed of the induction motor.

Abstract: An automatic equalization method and apparatus for bus bar voltages of a Power Factor Correction (PFC) circuit. The method includes calculating a difference in voltages of a positive bus bar and a negative bus bar, and increasing the rotation speed of a fan in the PFC circuit according to the difference in voltages of the positive bus bar and the negative bus bar until the voltages of the positive and negative bus bars are equalized. The apparatus includes a voltage difference module configured to calculate a difference in voltages of a positive bus bar and a negative bus bar, and a rotation speed control module configured to increase a rotation speed of a fan in the PFC circuit according to the difference in voltages of the positive bus bar and the negative bus bar, until the voltages of the positive and negative bus bars are equalized.

Abstract: A motor incorporating a power converter that includes a printed board on which an inverter IC, which converts a voltage of an external power supply into a high-frequency voltage and supplies the high-frequency voltage to a stator, is mounted, wherein on a surface of the printed board opposed to the stator, a high-voltage direct-current input wire, which is a copper foil provided on a surface on a stator side, is disposed. One end of the high-voltage direct-current input wire is electrically connected to a high-voltage input line of the external power supply and the other end of the high-voltage direct-current input wire is electrically connected to a high-voltage electrode of the inverter IC.

Abstract: A control system for controlling power supply of an electric machine of an automobile and which contributes to movement thereof, wherein the control system is connected, at an input thereof, to a mechanism estimating a temperature of a rotor of the electric machine and to a temperature sensor measuring a temperature of a stator of the electric machine. The control system includes mappings of a set of values for allocating supply currents of the electric machine on the basis of torque and rotational speed request values received at the input of the control system, and includes a switching mechanism for selecting the mapping, the supply current signals of which are transmitted to the electric machine, on the basis of the signals from the mechanism estimating the temperature of the rotor and from the stator-temperature sensor.

Abstract: A controller that performs pulse width modulation control of a three-phase inverter circuit includes a three-phase modulation voltage command value generation unit, a two-phase modulation voltage command value generation unit, a voltage command switching unit, and a PWM signal output unit. The voltage command switching unit switches a voltage command value to a two-phase modulation voltage command value when a determination value becomes larger than or equal to a first threshold value, and switches the voltage command value to a three-phase modulation voltage command value when the determination value becomes smaller than a second threshold value, which is smaller than the first threshold value.

Abstract: A method for the activation of a windscreen wiper motor is disclosed, in which the motor is connected to a wiper blade by a drive shaft, which moves the wiper blade between two reversal points of a wiping field in differing movement direction, where the rotation speed and direction of the motor, or the speed of the wiper blade, is detected by a sensor device and is supplied to a control device as an input value. The motor, before reaching the respective reversal point, is switched off, whereupon the drive shaft continues to rotate further by a castor angle up to a standstill, and the wiper blade moves further by a trailing distance. The actual speed of the wiper blade is compared at the switch-off time with a nominal speed, and the motor is operated further for a period of time when the comparison results in a difference in values.

Abstract: An apparatus for determining start of electric machine is disclosed wherein a frequency of a 3-phase current inputted from a motor is estimated to determine whether the motor has started using a difference between the estimated frequency and a frequency of output voltage of inverter configured to drive the motor.

Abstract: A circuit is provided for detecting peaks of a sinusoidal input signal includes circuitry for generating first and second sinusoidal output signals that are out of phase with one another and with the sinusoidal input signal. A comparator block compares the sinusoidal output signals to determine instances where the amplitudes of the first and second sinusoidal output signals cross over each other. The sinusoidal output signals may lead the sinusoidal input signal somewhat so that, after taking into account processing delay, the indicated crossover instances substantially coincide with peaks in the sinusoidal input signal such that a trigger signal generated by the circuit accurately indicates the timing of the peaks.

Abstract: There is provided a power conversion device including a plurality of Direct Current (DC) power sources (VB) that converts an output voltage of each of the DC power sources into an Alternating Current (AC) voltage, and outputs the converted AC voltage in series connection, and the device includes: a DC/DC converter (21) connected to each of the DC power sources (VB) to convert the output voltage of the DC power sources; a control device (31) that controls an output voltage of the each DC/DC converter (21); and an H-bridge circuit (22) provided on the output side of the DC/DC converter (21) to convert the voltage output from the DC/DC converter (21) into an AC voltage.

Abstract: Systems and methods provide actuator control. Actuator control is provided via charge control as opposed to voltage control. A driver for driving an actuator can include a charge pump for injecting charge into one or more capacitive elements of the actuator. The driver can further include a capacitance detection aspect for detecting the capacitance of the capacitive elements of the actuator to determine positioning of the actuator.

Abstract: A controller of a motor controller operates to perform a process including: controlling the H bridge circuit to switch to the charge mode; controlling the H bridge circuit to switch to the high-dissipation mode when the zero-cross detector detects that the back electromotive force voltage of the motor coil connected to a phase of the H bridge circuit shortly before the H bridge circuit is zero-crossed; controlling the H bridge circuit to switch to the low-dissipation mode after a predetermined time has elapsed; and controlling the H bridge circuit to switch to the free mode when the voltage detector detects that the differential voltage between the motor coils connected to the H bridge circuit is lower than a predetermined voltage.

Abstract: An estimating section detects a signal including counter electromotive voltage information of the motor, and estimating a magnetic pole electric angle and a rotational speed of the motor. A driving current controller repeats generation and cut-off of the driving current supplied from a power supply to the motor via the inverter circuit or regenerated from the motor to the power supply in a low-speed period between a stopped state and a predetermined rotational speed in an accelerating operation at a motor starting time or a decelerating operation at a motor stopping time. The estimating section detects the signal at the cut-off time so as to estimate the magnetic pole electric angle and the rotational speed in the low-speed period.

Abstract: An apparatus for modifying voltage command for detecting output current in inverter is disclosed to modify a PWM voltage command by determining a sector in a voltage hexagon, the sector having a PWM voltage command therein, by comparing the PWM voltage command, determining an area, the area having the PWM voltage command, within a current detection disabled area by converting a minimum sampling time to a minimum sampling PWM and using the converted minimum sampling PWM, and determining an adjusting voltage and a restoring voltage using a minimum injection voltage based on the determined area.

Abstract: A command procedure for an active magnetic bearing, the magnetic bearing comprising a series of electromagnetic actuators forming a stator, each actuator being suitable for exerting radial force on the rotor, a ferromagnetic body forming a rotor, kept free of contact between the electromagnetic actuators and suitable for being set in rotation around an axis of rotation, the rotor being suitable to undergo precession movements in particular. Sensors suitable for detecting radial displacements of the rotor and issuing position signals representative of the radial position of the rotor in relation to the actuators. Calculation of at least one actuator command signal the calculation of the command signal consisting of the application of at least one transfer function to the position signals, the transfer function containing a number of correction coefficients.

Abstract: A control device for AC rotary machine includes a current vector detection section (3), a magnetic flux vector detection section (9), an adaptive observation section (8), a control section (4), a voltage application section (5), a deviation vector calculation section (6) for outputting a current deviation vector and a magnetic flux deviation vector, and a deviation amplification section (7). The adaptive observation section (8) calculates an estimated current vector, an estimated magnetic flux vector, and an estimated position, based on a voltage instruction vector and an amplified deviation vector. Further, the control section (4) superimposes a high-frequency voltage vector, and the magnetic flux vector detection section (9) calculates a detected magnetic flux vector, based on a magnitude of a high-frequency current vector having the same frequency component as the high-frequency voltage vector, included in a detected current vector, and on a magnitude of a rotor magnetic flux.

Abstract: The present invention relates to a power-off brake circuit for a DC fan, which comprises a control unit, a motor driver unit, a switch unit, a power-off protection unit, and a brake unit and a brake unit. The control unit is coupled to the motor driver unit, the switch unit, the power-off protection unit. The brake unit is coupled to the motor driver unit and the power-off protection unit. By means of the circuit design of the present invention, the independent brake loop is used to achieve the effects of power-off brake and of the accurate control of rotating speed is improved.

Abstract: Electric circuit for estimating the angular position of a rotor of an electric motor, including: a sensing module configured to receive at least one electric signal representative of a drive current of the electric motor and to generate a measurement signal indicative of a switching of the at least one electric signal and a switching index indicative of the type of switching, rising or falling, of the at least one electric signal; and a computing module configured to supply, from the measurement signal and switching index a position signal representative of an angular position of the electric motor rotor.

Abstract: An actuator control apparatus includes an analog-digital conversion circuit, a servo circuit, a sampling circuit, and a driving circuit. The analog-digital conversion circuit is configured to sample a position detection signal with a first sampling period, convert the sampled signal into a digital signal, and output the digital signal, the position detection signal outputted from a position sensor corresponding to a position of a control target. The servo circuit is configured to calculate a displacement amount, by which the control target is to be displaced by an actuator, and output first servo control data corresponding to the calculated displacement amount, based on the position detection signal converted into the digital signal. The sampling circuit is configured to linearly interpolate the first servo control data, and output second servo control data sampled with a second sampling period shorter than the first sampling period.