One aspect of a motor control device according to the present invention is a motor control device that controls a motor of an electric pump. The motor control device includes a drive unit that supplies a drive current to the motor; a control unit that controls a rotation speed of the motor by controlling the drive unit based on a rotation speed command value; and a current detection unit that detects the drive current supplied to the motor, and supplies a current detection value indicating a detection result of the drive current to the control unit. The control unit determines whether or not a foreign fluid suction abnormality occurs in the electric pump, based on a first current detection value acquired at a first timing when the rotation speed command value changes from a first command value to a second command value and a second current detection value acquired after the first timing.

For polyharmonic flux motor loss increase, a method offsets pulse width modulation (PWM) carriers to a motor to increase motor harmonics. The offset PWM carriers increase energy losses for the motor.

Examples described herein provide a method for overspeed protection of a motor of a gate crossing mechanism. The method includes monitoring, by an overspeed protection circuit, a voltage across a first Zener diode and a second Zener diode. An anode of the first Zener diode is connected to an anode of the second Zener diode. The method further includes, responsive to determining that a Zener voltage threshold is exceeded, allowing a current to flow into a gate pin of a triac. The triac controls the motor of the gate crossing mechanism.

Examples described herein provide a method for overspeed protection of a motor of a gate crossing mechanism. The method includes monitoring, by an overspeed protection circuit, a voltage across a first Zener diode and a second Zener diode. An anode of the first Zener diode is connected to an anode of the second Zener diode. The method further includes, responsive to determining that a Zener voltage threshold is exceeded, allowing a current to flow into a gate pin of a triac. The triac controls the motor of the gate crossing mechanism.

A motor control system operable to control a motor includes a motor control circuit and an inverter circuit connected to the motor control circuit and configured to connect to the motor at phase output terminals. The inverter circuit, in response to one or more output control signals indicating a deceleration instruction from the motor control circuit, implements a multi-state deceleration sequence for at least one commutation state of a commutation scheme of the motor.

A motor control system operable to control a motor includes a motor control circuit and an inverter circuit connected to the motor control circuit and configured to connect to the motor at phase output terminals. The inverter circuit, in response to one or more output control signals indicating a deceleration instruction from the motor control circuit, implements a multi-state deceleration sequence for at least one commutation state of a commutation scheme of the motor.

Provided is a converter including: a primary-side switching unit to be connected to a battery; a secondary-side switching unit to be connected to a motor; a transformer provided between the primary-side switching unit and the secondary-side switching unit; and a controller configured to control at least the secondary-side switching unit so as to output a voltage that depends on an output waveform profile of a desired waveform to the motor.

A module for controlling a rotary electric machine for a motor vehicle includes a calculating program, a value of the rotor coil voltage Vrot, a resistance value of the rotor coil Rrot, a value of the rotor coil induction Lrot. The program estimates the rotor coil current Irot according to this formula: Irot[k]=Irot[k−1]+(Vrot[k−1]−Irot[k−1]×Rrot)/Lrot×Ts in which Irot[k−1] is the estimate of the rotor coil current previously calculated at time k−1 and Ts is the sampling time between the index k−1 and the index k. To switch from a motor mode to a neutral mode, the control module is configured to control a shorting of the phases of the stator after the estimated rotor coil current Irot is equal to a predetermined value.

A module for controlling a rotary electric machine for a motor vehicle includes a calculating program, a value of the rotor coil voltage Vrot, a resistance value of the rotor coil Rrot, a value of the rotor coil induction Lrot. The program estimates the rotor coil current Irot according to this formula: Irot[k]=Irot[k−1]+(Vrot[k−1]−Irot[k−1]×Rrot)/Lrot×Ts in which Irot[k−1] is the estimate of the rotor coil current previously calculated at time k−1 and Ts is the sampling time between the index k−1 and the index k. To switch from a motor mode to a neutral mode, the control module is configured to control a shorting of the phases of the stator after the estimated rotor coil current Irot is equal to a predetermined value.

Embodiments of present disclosure relate to a Safe Torque Off (STO) circuit and a method for the STO circuit. The STO circuit has an input suitable for receiving an input signal, channels coupled to the input in parallel, wherein each of the channels includes a switch, a level conversion circuit, and an isolation circuit connected in series. Each isolation circuit being configured to be turned on when the respective switch is closed and to be turned off when the respective switch is opened. Each of the channels also includes an inverter module, a control unit, a first switch unit, and a second switch unit.