Abstract: An H-bridge device and an associated method for controlling an H-bridge, driving a load such as a DC current electric motor, configured to prevent any reversal of polarity in the load in an unloading phase of said load, without having to limit use of the pulse generator supplying said H-bridge in terms of duty cycle. The H-bridge device includes independent comparators and independent slope control at each of the switches of the H-bridge. Furthermore, according to one aspect, the device includes ‘push-pull’ drivers imposing the potential VBAT/2 at the connection points OUT0, OUT1, on either side of the load, in order to limit electromagnetic interference.

Abstract: A field winding type rotating electric machine includes: a stator armature winding wound on a stator core; a rotor field winding wound on a rotor core; a rectifying element connected to both ends of the rotor field winding; a capacitor having one end connected to one end of the rectifying element and the other end connected between the two ends of the rotor field winding; and a control circuit configured to supply electric current, which includes a fundamental component for generating rotational torque and a harmonic component having a shorter period than the fundamental component and superimposed on the fundamental component, to the stator armature winding and thereby induce excitation current in the rotor field winding. Moreover, an inductance of the rotor field winding and a capacitance of the capacitor are in a resonant relationship with a frequency of the harmonic component.

Abstract: A wiper blade which starts an operation from a reversal position different from a lower reversal position and an upper reversal position with one of the lower reversal position and the upper reversal position as a next movement destination, a wiper control circuit generates a second correction target speed table by correcting the upper/lower reversal position target speed table defining a target rotational speed of an output shaft according to a change in a rotational angle of the output shaft of the wiper motor in a case in which a wiper blade is moved between a lower reversal position and an upper reversal position, based on the different reversal position and the position of the next movement destination of the wiper blade, and controls the rotational speed of the output shaft based on the second correction target speed table.

Abstract: A method for outputting constant air volume by a fan system including at least two brushless DC (BLDC) motors, the method including: storing a constant air volume control function Q=F (n, C) in a data processor, where Q indicates an air volume, n indicates a rotational speed of the BLDC motors, and C indicates an operating parameter of the BLDC motors; transmitting, by the data processor, identical speed signal commands to the BLDC motors, and allowing the BLDC motors to operate at equal or approximately equal rotational speeds; and feedbacking, by the BLDC motors, motor operating parameters C to the data processor, calculating, by the data processor, a motor speed n for outputting and maintaining a constant air volume, and transmitting the motor speed to the BLDC motors.

Abstract: A power conversion device includes a first switching unit connected between a DC power supply and an inverter circuit, a resonant circuit connected to the input of the inverter circuit and formed by connecting a capacitor, a reactor, and a second switching unit, and a control unit, wherein, during a resonant operation period in which the first switching unit is controlled to be off and the second switching unit is controlled to be on, the control unit controls the inverter circuit to shift from a mode in which current flows back through one of upper and lower arms of the inverter circuit to a mode in which current flows back through the other arm, and provides a period in which the upper and lower arms for every phase of the inverter circuit are turned on simultaneously.

Abstract: A multiple-phase electric machine provided with multiple inverter power circuits is described herein. The present multiple-phase electric machine aim at performing configuration changes while reducing the loss of torque when machines are switched between configurations. This is done by forming groups of phases defining machine portions that are powered by a separate inverter power circuit and by switching the machine portions separately with controlled switching devices.

Abstract: A half-bridge driver circuit is configured to generate drive signals based on control signals. A processing circuit is configured to generate high side and low side control signals based on a control signal. An edge detector is configured to generate first and second signals in response to rising and falling edges in the control signal. A state machine transitions between states in response to the first and second signals, and is configured to sequentially, in response to the first signal, set the high side and low side control signals low; in response to the second signal, set the high side control signal high and the low side control signal low; in response to the first signal, set the high side and low side control signals low; and in response to the second signal, set the high side control signal low and the low side control signal high.

Abstract: A fuel cell system mounted on a vehicle includes a drive motor generating a driving force and regenerative power; an auxiliary machine consuming the regenerative power; and a controller. The controller determines that the vehicle is in a first state when the vehicle has a negative vehicle speed, a move forward request is given to the vehicle and an accelerator pedal is depressed or when the vehicle has a positive vehicle speed, the move backward request is given to the vehicle and the accelerator pedal is depressed. When a predetermined first condition including a condition that the vehicle is in the first state is satisfied, the controller performs an auxiliary machine consumption process that causes the auxiliary machine to consume the regenerative power that includes a required power for the drive motor calculated by using a depression amount of the accelerator pedal.

Abstract: A motor control apparatus includes: a gate control voltage output unit that outputs a drive signal based on a corrected Hall edge that constitutes each of six Hall stages; a counter value acquisition unit that acquires a counter value which is represented by a time period between two Hall edges from the position detection signal; and a switching control unit that allows a value obtained by multiplying a previous counter value of each of the Hall stages by a preset correction coefficient to be a first delay time of each of current Hall edges and allows the gate control voltage output unit to output the drive signal based on each of the Hall edges obtained by correcting each of the Hall edges corrected by the first delay time by a second delay time that advances a Hall edge corresponding to a predetermined sensor among the plurality of sensors.

Abstract: A motor control device is a motor control device which controls a spindle motor in a machine tool, and includes: a moving average filter which moving averages a torque command value or drive current value of the spindle motor for averaging time and generates averaged load information of the spindle motor; and an averaging time calculation unit which calculates, as the averaging time of the moving average filter, a first time of an integral multiple of a period of one rotation of the spindle driven by the spindle motor, or a second time of an integral multiple of a value arrived at by dividing the period of one rotation of the spindle by the number of cutting tooth of the tool.

Abstract: To provide a three phase duplexing motor for electric power steering apparatus that can manage increase in a supply current and can manage influence on motor, when increasing a supply current to the three phase windings of the normal set. An three phase duplexing motor for electric power steering apparatus sets 0 to a supply current to three phase winding of abnormality occurrence set, and increases a supply current to three phase windings of the normal set, with a preliminarily set increase upper limit current value as an upper limit.

Abstract: The invention relates to a drive system, in particular for a vehicle, comprising a fuel cell unit for generating electric energy, a secondary battery for storing electric energy, an electric machine with windings, and an inverter for actuating the electric machine. The inverter is designed as a 3-level inverter and has multiple electronic switches, diodes, a plus pole, a minus pole, and a neutral pole. The fuel cell unit and the secondary battery are connected in series and are connected to the poles of the inverter. The invention also relates to a method for heating a drive system according to the invention, wherein the switches of the inverter are actuated such that a short-circuit current path is produced between the poles of the inverter to which the fuel cell unit is connected.

Abstract: A sheet conveyance apparatus includes a connection member to connect or separate a motor to drive a conveyance roller, where a motor rotor has a rotation phase and a motor winding includes a driving current controlled by a controller. Per control by the controller, a value of a torque current component of a detected driving current becomes a target value of the torque current component and a value of an exciting current component of the detected driving current becomes a target value of the exciting current component. The controller can cause a deviation between a rotor target phase and a determined rotation phase to decrease, cause magnetic flux passing through the winding to be weaker than a magnetic flux of the rotor, and cause the magnetic flux to be stronger than that passing through the winding in a first period.

Abstract: Various embodiments are described herein for methods and systems for controlling a switched reluctance machine (SRM) having an axially extending rotor mounted to a shaft, an axially extending stator disposed coaxially and concentrically with the rotor, the rotor and stator having a plurality of salient poles, the stator poles protruding radially towards the rotor poles, and a plurality of electrical coils wound about the stator poles including a plurality of separate phase coils defining a plurality of phases of the SRM. In one example embodiment, the method comprises providing a control system operatively coupled to a current controller of the SRM, where the control system is configured to generate a unique set of current reference profiles based on an objective function and at least one constraint function and operating the SRM based on the unique set of current profiles generated by the control system.

Abstract: An apparatus for controlling an inverter for driving a motor including a processor which includes: a current processor configured to generate a voltage command for allowing a current detection value, generated by measuring a current provided from an inverter to a motor, to follow a current command for driving the motor; a voltage modulator configured to generate a pulse width modulation signal for controlling on and off states of a switching element within the inverter with a predetermined switching frequency based on the voltage command; and a frequency determining processor configured to randomly change the switching frequency based on driving information of the motor.

Abstract: A braking device for a movable door leaf comprises an electric motor operated as a generator, whose shaft is rotatable through a movement of the door leaf and at whose terminals a movement-dependent motor voltage is created and a brake circuit to which the motor voltage is applied or could be applied and which can be short-circuited via the motor terminals to dampen movement of the door leaf. In addition, the braking device comprises an emergency brake circuit to which the motor voltage is applied or applicable and via which the motor terminals can be short-circuited to dampen a movement of the door leaf. In doing so, means are provided which are designed to detect the presence of a malfunction of the brake circuit and to short-circuit the motor terminals via the emergency brake circuit when the presence of a malfunction of the brake circuit is detected.

Abstract: A unique system may include a power absorber; an electrical machine coupled to the power absorber and operative to supply mechanical power to the power absorber; a drive coupled to the electrical machine and operative to supply electrical power to drive the electrical machine; and a controller communicatively coupled to the drive. The controller may be configured to execute program instructions to selectively vary a control voltage while maintaining a given torque output of the electrical machine, and to determine, based on varying the control voltage, a minimum current required for the electrical machine to maintain the given torque output.

Abstract: A fan apparatus has a drive circuit for an electrically-driven rotor, and includes a drive signal generating circuit portion for the electrically-driven rotor; an output stage including an upper MOSFET and a lower MOSFET; and a motor portion to be driven by the output stage. One of the upper MOSFET and the lower MOSFET is a braking MOSFET, while another of the upper MOSFET and the lower MOSFET is a non-braking MOSFET. The fan apparatus further includes a back-electromotive force supply portion arranged to supply, to the braking MOSFET, power by a back-electromotive force caused by rotation of the motor portion while a power supply voltage for the electrically-driven rotor is not being supplied; and an electromagnetic brake portion arranged to electromagnetically brake the motor portion by causing the braking MOSFET to enter an ON state through the power supplied by the back-electromotive force supply portion.

Abstract: A motor drive controller comprises: a driver unit comprising semiconductor switches (SW1-SW4) for adjusting power supplied to a motor; a control unit for outputting, to the driver unit, a control signal (PWM1, PWM2) for controlling on and off of the semiconductor switches (SW1-SW4); and an overcurrent monitoring unit for monitoring for an overcurrent at multiple locations in the driver unit. The control unit outputs, to the driver unit at a predetermined timing, the control signal for forcibly maintaining the semiconductor switches at at least two different on-off combination settings (M2) one after another for a predetermine time per each on-off combination setting. Each time the predetermined time has elapsed, the control unit detects whether and which of abnormalities due to short-to-ground and short-to-supply has occurred in a motor power supply line connecting the motor to the driver unit, based on where an overcurrent is detected in the driver unit.

Abstract: A method is provided for type-specific operating of an electric drive unit, wherein the drive unit is configured for coupling and driving a tool unit selected from a set of different types of tool units. The set includes at least one rotatory tool unit and at least one non-rotatory tool unit. The method includes: driving of a coupled tool unit by the drive unit; identifying operating data of the drive unit during the driving procedure; determining, based on the identified operating data, whether the coupled tool unit is a rotatory tool unit or a non-rotatory tool unit; and controlling the drive unit in a rotation control mode if the coupled tool unit is determined to be a rotatory tool unit, or in a non-rotation control mode if the coupled tool unit is determined to be a non-rotatory tool unit.