Abstract: A method is for a circuit for a motor comprising first and second phase windings. The method comprises receiving alternating current (AC) power from the first and second phase windings at a direct current (DC) power supply and converting the AC power to DC power and receiving AC power from the first and second phase windings by at least one power switch between the first and second phase windings and switching the AC power by the at least one power switch. The method includes preventing the DC power supply from collapsing, by a first component connected to the DC power supply, when the at least one power switch is on during a first portion of an AC cycle and preventing the DC power supply from collapsing, by a second component connected to the DC power supply, when the at least one power switch is on during a second portion of the AC cycle.

Abstract: The present invention reduces electric power consumption of a network inverter. The inverter (1a, 1b, 1c) includes: an MPU (20a, 20b, 20c); and a power supply (10) configured to carry out electric power delivery to the MPU (20a, 20b, 20c) and to a power source circuit (40). In a case where the inverter (1a, 1b, 1c) is to enter a standby state, an electric power delivery control circuit (22) of the MPU (20a, 20b, 20c) blocks electric power delivery to the power source circuit (40).

Abstract: A stepping motor control device is configured to drive a stepping motor by applying a normal drive pulse or a fixed pulse having an energy larger than that of the normal drive pulse. The stepping motor control device includes a determination unit configured to, based on whether or not a pulse applied to the stepping motor before the normal drive pulse is the fixed pulse, determine whether or not to add a degaussing pulse is applied to the normal drive pulse, the degaussing pulse being a pulse for canceling a residual magnetic flux generated in a stator of the stepping motor when the fixed pulse; and a drive control unit configured to, based on a determination result of the determination unit, drive the stepping motor with the normal drive pulse to which the degaussing pulse is added.

Abstract: Provided is a control system and method for a power-driven nail gun, which includes a battery, a motor, a flywheel rotating along with the motor, an impacting member receiving kinetic energy of the flywheel and a nail channel providing a channel for a nail to move along therewith when hit by the impacting member. The method includes utilizing a microcontroller to provide a pulse width modulation (PWM) signal for a driving circuit to drive the motor based on the PWM signal; and in response to reaching a target rotation speed by the motor, utilizing the microcontroller to output a corresponding PWM duty to the driving circuit based on the voltage of the battery, to make the motor maintain at the target rotation speed. The nails obtain stable and consistent kinetic energy and stability of nail firing is effectively improved.

Abstract: A motor drive device includes a single-phase inverter that converts a direct-current voltage output from a power supply which is a battery, into an alternating-current voltage. The inverter outputs the alternating-current voltage as an applied voltage to be applied to a motor. The applied voltage is lower when the direct-current voltage is a second voltage lower than a first voltage than when the direct-current voltage is the first voltage. Consequently, a discharge current of the battery is reduced, and the motor drive device capable of reducing an increase in battery temperature can be obtained.

Abstract: To provide a controller for rotary electric machine apparatus which can calculate the voltage command value of the converter which reduces power loss with good accuracy, in the case where the normal modulation control and the overmodulation control are switched and performed. A controller for rotary electric machine apparatus sets a system voltage that power loss becomes the minimum as the converter voltage command value, based on a power loss characteristics of the normal modulation control which is a power loss characteristics of at least the inverter with respect to the system voltage in performing the normal modulation control, and a power loss characteristics of the overmodulation control which is a power loss characteristics of at least the inverter with respect to the system voltage in performing the overmodulation control.

Abstract: There are provided at least two disconnection contactors each of which switches between connection and disconnection of each of at least two of three second power lines for supplying a three-phase alternating-current voltage generated by an inverter to a second PM motor, at least two short-circuit contactors each of which switches between connection and disconnection between the two second power lines of each of at least two of the pairs of the three second power lines, and a calculator to control the disconnection contactors and short-circuit contactors.

Abstract: At least one embodiment is directed to a system including a motor, a battery that provides power to the motor, and control circuitry that provides one or more first current pulses to the motor using power from the battery to cause one or more second current pulses in the battery that heat the battery to a desired temperature while maintaining zero torque in the motor.

Abstract: A motor controller executing a current regulator and a modulation routine in separate update intervals provides an improved fundamental voltage waveform for a motor controlled by the motor controller. The current regulator is executed at a first periodic update rate and the modulation routine is executed at a second periodic update rate, where the frequency at which the modulation routine executes is at least twice the frequency at which the current regulator executes. Executing the current regulator and the modulation routines at different frequencies results in the current regulator generating a single voltage reference signal for multiple periods of the modulation routine. To reduce voltage ripple induced by decoupling execution of the current regulator and the modulation routine, the motor controller extrapolates the voltage reference generated by the current regulator into multiple voltage reference signals, where a unique voltage reference signal is provided for each period of the modulation routine.

Abstract: In a method for determining a flux of an asynchronous machine, the flux is adjusted according to a loss of the asynchronous machine. Therefore, an apparatus for determining the flux of the asynchronous machine is provided with a model for calculating a loss of the asynchronous machine according to the flux of the asynchronous machine. A selection facility selects a flux according to the loss.

Abstract: A system includes a motor and a motor controller coupled to the motor. The motor controller includes a current sense circuit configured to: receive a first phase current sense measurement on a first measurement path; receive the first phase current sense measurement on a second measurement path; receive a second phase current measurement on the first measurement path; receive the second phase current on the second measurement path; average the first phase current sense measurement on the first measurement path with the first phase current sense measurement on the second path; and average the second phase current sense measurement on the first measurement path with the second phase current sense measurement on the second path.

Abstract: In a thyristor starter, an inverter converts DC power provided from a converter through a DC reactor into AC power having a variable frequency, and supplies the AC power to a synchronous machine. A controller controls the inverter based on a phase control angle. A voltage regulator regulates an induced voltage of the synchronous machine by supplying a field current to the synchronous machine. When a rotation speed of the synchronous machine exceeds a reference rotation speed during acceleration of the synchronous machine, the voltage regulator controls the field current such that the induced voltage increases with an increase in the rotation speed of the synchronous machine. The controller decreases a rate of increase in the phase control angle relative to the rotation speed of the synchronous machine, as compared with when the rotation speed of the synchronous machine is less than the reference rotation speed.

Abstract: Methods, systems, and devices for an H-bridge driver for haptics and camera voice coil motor applications are described. A device may generate a control signal for an application executing on the device such as a camera application, a gaming application, or any application receiving a user input or outputting feedback to the user. The device may generate the control signal using a voice coil motor driver of a camera component of the device. The device may drive a haptics motor based on the generated control signal and generate a haptic response based on driving the haptics motor. The device may, as a result, output the generated haptic response. Additionally or alternatively, the device may drive a voice coil motor based on the generated control signal and may control a camera component of the device based on driving the voice coil motor or the haptics motor, or both.

Abstract: Methods and apparatus for providing DC motor gate driver isolation. In embodiments, first and second DC input signals are received at a supply control module, which generates first and second control signals for controlling first and second switches. A first transformer has a primary winding having one end coupled to the first DC input signal and another end coupled to the first switch A second transformer has a primary winding having one end coupled to the second DC input signal and another end coupled to the second switch. The supply control module controls the first and second control signals so that a secondary winding of the first or second transformer energizes an isolated AC bus coupled to the first and second transformers. First and second gate drivers receive respective isolated AC signals from the isolated AC bus. Conversion of the isolated AC signals back to DC occurs at the point of use.

Abstract: A control apparatus controlling an opening and closing member for a vehicle includes a drive control unit operating an opening and closing member of the vehicle by a motor serving as a drive source, and a catch detection unit detecting a catch of a foreign object caught by the opening and closing member in response to a current value of the motor. The drive control unit includes a motor control signal output unit outputting a motor control signal for supplying a drive power to the motor, and an advance-angle value setting unit setting an advance-angle value for advancing a phase of the motor control signal. The advance-angle value setting unit includes an advance-angle value increase prohibition unit prohibiting increase setting of the advance-angle value in a case where the current value of the motor reaches an advance-angle value increase prohibition current value.

Abstract: A drive circuit comprises a two port LC inductive network with a source switch operable to switch the network between an ST state and an active state; an inverter and a controller for controlling the On-Off state of the switches of the inverter and the On-OFF state of the source switch, wherein the controller in use operates the switches to provide: a non-drive portion of the PWM period in which the source switch is held open and the top and bottom switches of at least one phase are held closed so that the drive circuit is operating in an ST mode, a drive portion of the PWM period which immediately follows or immediately precedes the non-drive portion in which the source switch is closed and the top and bottom switches are arranged, and in which the controller is configured to employ a PWM pattern in which all of the bottom switches or all of the top switches are moved from the closed state to an open state simultaneously, and further in which the source switch is moved from the open state to the closed state

Abstract: A servo control device for controlling a motor based on a position command when an operation target is connected to the motor via a wave gear reduction mechanism may include a position control system configured to detect a shaft angular position of the motor to perform a closed-loop control based on the shaft angular position; an inverse control element having an inverse characteristic of dynamics of the position control system; and a compensation amount generation unit configured to generate a compensation amount for compensating for an angular transmission error of the wave gear reduction mechanism. The inverse control element is configured to apply compensation amount to the position control system.

Abstract: The invention provides a separately excited direct current motor drive apparatus and electric equipment.

Abstract: A control system and method of controlling a multi-phase electric machine for controlling the flow of electrical current between a voltage source and the multi-phase electric machine or other application/load. The control system includes, between each phase of the multi-phase electric machine and the voltage source: a high side diode and a high side switch positioned in parallel between a positive terminal of the voltage source and the electric machine with the high side diode being reverse biased with regard to the positive terminal; and a low side diode and a low side switch positioned in parallel between a negative terminal of the voltage source and the electric machine with the low side diode being reverse biased with regard to the electric machine. The control system operates the high side and low side switches to provide efficient operation of the electric machine.

Abstract: A drive apparatus is provided for driving a multi-phase rotating electric machine. The rotating electric machine includes a plurality of winding groups for respective phases. The drive apparatus includes a first inverter connected with start terminals of the winding groups of the rotating electric machine, a second inverter connected with intermediate terminals of the winding groups, and an energization controller configured to selectively perform energization of the winding groups by the first inverter and energization of the winding groups by the second inverter. Each of the first and second inverters includes a plurality of switch pairs respectively corresponding to the winding groups and each consisting of an upper-arm switch and a lower-arm switch that are connected in series with each other. Moreover, each of the upper-arm and lower-arm switches of the first inverter is configured to have bidirectionally-conducting and bidirectionally-blocking functions.