A motor control circuit includes a control circuit configured to control a switching operation of an inverter circuit, the inverter circuit being configured to supply an alternating current power to a motor, and includes a determination-information generating circuit configured to generate at least one determination value that conveys information on whether the motor malfunctions or deteriorates. The motor control circuit includes a determination circuit configured to determine whether the motor malfunctions or deteriorates based on the determination value to output, as an interrupt signal, a signal indicating that the motor malfunctions or deteriorates to the control circuit.

The invention relates to a method for controlling a three-phase inverter (3) using a 120 control arrangement associated with a PWM-type control, the inverter (3) being driven by a controller and configured to power a permanent-magnet synchronous motor (5) of a device on board an aircraft. The motor (5) comprises a stator and a rotor that can be rotated relative to the stator when the motor (5) is powered. The inverter (3) comprises three branches (31, 32, 33), each branch comprising two switches (310, 311, 320, 321 and 330, 331) associated with a motor winding sing a 120 control arrangement of a three-phase inverter. The method is characterised in that when one switch on one branch is controlled such as to switch front the on-state to the off-state, the other switch on said branch is controlled such as to be in the on-state for a sufficient amount of time to allow the magnetic discharge of the motor winding associated with said branch.

A motor controller includes: a rotation speed measurement portion that measures a rotation speed of a motor; and an energization method switching portion that switches an energization method so that the motor is driven by a 120-degree energization method when a rotation speed of the motor measured by the rotation speed measurement portion is less than or equal to a predetermined threshold value, and the motor is driven by a 150-degree energization method when a rotation speed of the motor measured by the rotation speed measurement portion exceeds the predetermined threshold value.

The present disclosure relates to an apparatus and method for controlling switching of a wiring mode of a motor capable of being operated in a plurality of wiring modes, a motor control apparatus includes a motor including a rotor that rotates according to a motor torque by a pulse width modulation (PWM) control, a switching unit provided at the motor and switching a wiring method inside the motor so that the motor is driven according to another wiring mode, and a controller generating a speed command frequency for controlling a rotation speed of the rotor, and controlling the switching unit so that the wiring mode of the motor is switched according to a result of comparing the speed command frequency with a switching boundary frequency according to the wiring mode of the motor, wherein when the PWM control is stopped in response to the switching of the wiring mode, the controller estimates a rotation state of the rotor that rotates inertially, and when the PWM control is restarted, the controller sets the estimated rotation state of the rotor as an initial value of the rotor, and controls a rotation speed of the motor of which the wiring mode is switched based on the set initial value of the rotor.

A vehicle drive control device that controls a vehicle drive device in which a first engagement device, a rotating electrical machine, and a second engagement device are provided in this order from an input side in a mechanical power transmission path connecting an input to an output, the input being drive-coupled to an internal combustion engine serving as a vehicle drive power source, and the output being drive-coupled to wheels, wherein each of the first engagement device and the second engagement device can be changed between an engaged state in which drive power is transmitted and a disengaged state in which drive power is not transmitted, the vehicle control device including an electronic control unit.

An actual rotation speed of the asynchronous motor is detected according to the given rotation speed thereof. A given voltage of the asynchronous motor is obtained according to a vector control algorithm and a PI-IP control algorithm and is used as a reference output voltage of the BBMC. A duty cycle of a power switch tube in the BBMC is obtained according to a finite-time control algorithm by taking capacitor voltages and inductor currents in the BBMC as control variables of the speed regulation system. The conducting time of the power switch tube in the BBMC is controlled according to the duty cycle and an output control signal of a corresponding switching cycle, so that an output voltage consistent with its reference output voltage is obtained at an output end of the BBMC, so that the actual rotation speed of the asynchronous motor accurately tracks the given speed.

An actual rotation speed of the asynchronous motor is detected according to the given rotation speed thereof. A given voltage of the asynchronous motor is obtained according to a vector control algorithm and a PI-IP control algorithm and is used as a reference output voltage of the BBMC. A duty cycle of a power switch tube in the BBMC is obtained according to a finite-time control algorithm by taking capacitor voltages and inductor currents in the BBMC as control variables of the speed regulation system. The conducting time of the power switch tube in the BBMC is controlled according to the duty cycle and an output control signal of a corresponding switching cycle, so that an output voltage consistent with its reference output voltage is obtained at an output end of the BBMC, so that the actual rotation speed of the asynchronous motor accurately tracks the given speed.

A motor drive apparatus that can continue operation within the upper limit of system control even if a voltage drop of an AC power source occurs during operation of a motor used for a hoist or a crane is provided. The inverter control unit of the motor drive apparatus includes a speed reference setting means for setting the rotation speed of the motor, means for detecting a speed deviation between the output of the rotation speed detection means for detecting the rotation speed of the motor and the output of the speed reference setting means, means for controlling the output current of the inverter according to the output of the speed deviation. The speed reference setting means includes a correction circuit for correcting an external speed command given from outside. The correction circuit corrects the external speed command according to a deviation between a detection value of a DC voltage and a first reference value when a voltage drop signal is received from the voltage drop detection means, and makes the corrected speed command as the output of the speed reference setting means.

An inverter, motor drive device and freezing device, with which it is possible to effectively suppress current beats in the event of over-modulation without requiring additional circuits. This motor driving device includes: a rectifier circuit that converts the AC voltage from an AC power supply into a DC voltage; a smoothing capacitor that smoothes the DC voltage output from the rectifier circuit; an inverter circuit that converts the DC voltage output from the smoothing capacitor into an AC voltage; and a controller that reduces the current beat component by estimating, using a phase locked loop process, the frequency, phase and amplitude of the current beat component in the output current of the inverter circuit, and corrects the voltage command to the inverter circuit on the basis of the estimated frequency, phase and amplitude.

A method may include transmitting an excitation signal from a stator of a motor to a rotor of the motor, where the excitation signal is received at a set of rotor windings, and where the excitation signal produces a rotating magnetic flux at the rotor that generates a first alternating current (AC) voltage at a set of stator windings. The method may further include controlling the excitation signal to equalize and synchronize the first AC voltage to a second AC voltage at an AC bus. After the synchronization, the method may also include electrically connecting the set of stator windings to the AC bus. The method may include reducing an amplitude of the excitation signal to enable current flow from the AC bus to the set of stator windings, thereby generating torque that results in rotation of the rotor.