A vehicle driving apparatus includes an inverter which drives a permanent magnet motor. The inverter includes a three-phase bridge circuit including a plurality of switch elements, a drive circuit connected to the three-phase bridge circuit, a control circuit connected to the drive circuit, and an abnormality detecting unit which detects abnormality of the inverter. The drive circuit includes a three-phase-short-circuit-forming circuit which causes three phases of the permanent magnet motor to form short circuits, an abnormality accepting terminal which accepts an abnormality signal output from the abnormality detecting unit, and a check terminal which accepts an active check signal for causing the three-phase-short-circuit-forming circuit to perform three-phase short circuit control.

A method for operating an electrical circuit, wherein the electrical circuit includes a DC converter, an inverter and an electric machine, wherein the inverter is connected on the direct current side to the output of the DC converter and on the alternating current side to the electric machine, wherein the electric machine is operated using a torque specification and/or a rotational speed specification, wherein the level of the output voltage of the DC converter is set as a function of a current torque specification and/or a current rotational speed specification.

An electric drive system of a vehicle comprises a motor, a position sensor, an inverter, sensors to sense current and voltage supplied to the motor, and a controller to control the motor by controlling the inverter based on data from the position sensor and the sensors and a torque command. The controller estimates a motor torque using a motor model, calculates the motor torque, and generates a first state of health for the electric drive system based on a difference between the estimated and calculated motor torques. The controller generates, in response to the first state of health being less than or equal to a first threshold, a second state of health for at least one of the position sensor, the sensors, and the motor, and determines whether one of the position sensor, the sensors, and the motor is faulty based on the first and second states of health.

Provided are a motor control method, a motor control device and a variable frequency drive. The method includes: performing an amplitude limiting on a command torque to obtain a target torque; calculating a target current based on the target torque; determining whether an amplitude of the target current is greater than a current limiting amplitude; performing an amplitude limiting on current components of the target current, when the amplitude of the target current is greater than the current limiting amplitude; and controlling a motor based on the current components of the target current after being performed the amplitude limiting. Thus, an amplitude limiting on current of a motor is achieved by performing amplitude limiting on torque and current.

An electric drive system of a vehicle comprises a motor, a position sensor, an inverter, sensors to sense current and voltage supplied to the motor, and a controller to control the motor by controlling the inverter based on data from the position sensor and the sensors and a torque command. The controller estimates a motor torque using a motor model, calculates the motor torque, and generates a first state of health for the electric drive system based on a difference between the estimated and calculated motor torques. The controller generates, in response to the first state of health being less than or equal to a first threshold, a second state of health for at least one of the position sensor, the sensors, and the motor, and determines whether one of the position sensor, the sensors, and the motor is faulty based on the first and second states of health.

A vehicle controller for a vehicle including a drive source including an electric motor includes: a sense-of-beating producer configured to acquire a total required torque which is a required torque of the entire vehicle and configured to derive a total target torque corresponding to the total required torque as applied to a predetermined engine combustion cycle; and a target motor torque deriver configured to, based on the total target torque, derive a target motor torque for torque control of the electric motor. The vehicle controller controls the electric motor based on the target motor torque.

A method and system for controlling and regulating operation of a multi-phase rotary electric machine in a manner that minimizes power loss under partial load conditions is described. This includes an instruction set that is executable to determine a torque command and a rotational speed of the electric machine, determine a peak torque per loss parameter for the electric machine based upon the rotational speed, and determine a second torque parameter for the electric machine based upon the rotational speed. A modulated torque command for controlling the electric machine is determined based upon the peak torque per loss parameter and the second torque parameter, wherein the electric machine generates an average torque that is equivalent to the torque command when operating in response to the modulated torque command. The inverter is controlled to operate the electric machine based upon the modulated torque command.

A method for controlling a current distribution between multiple electric motor devices in a current sharing system of an electrically driven construction machine is described. The method comprises estimating a first current demand for a first electric motor device powered by a battery system and estimating a second current demand for a second electric motor device powered by the battery system. The method comprises determining an available amount of current available in the current sharing system. The method comprises splitting the available amount of current into a first portion for driving the first electric motor device and a second portion for driving the second electric motor device. The splitting is based on the estimations of the first current demand and the second current demand. A control device configured to run the method and to run a current sharing system for an electrically driven construction machine is also described.

A motor control device includes a control and computation unit, a compensation signal generation unit, an adder, and a drive unit. The control and computation unit is configured to perform computation processing based on a detected rotational position of a motor and a positional instruction, and to generate a first torque instruction signal to be used to drive the motor. The compensation signal generation unit is configured to generate a torque compensation signal to be used to compensate the first torque instruction signal. The adder is configured to add the torque compensation signal to the first torque instruction signal, and to output an acquired signal as a second torque instruction signal. The drive unit is configured to generate a drive signal to be used to power-drive winding wires of the motor based on the second torque instruction signal. The compensation signal generation unit is further configured to generate a torque compensation signal that switches to a torque compensation value having a predetermined value at a switching timing based on a timing when a rotation direction of the motor inverts.

A generator set for generating an alternating current, includes a primary power unit, an alternating current generator, and a secondary power unit. The alternating current generator is rotationally coupled to the primary power unit, and converts power provided by the primary power unit into an electric power. The secondary power unit is connectable to the alternating current generator so as to increase the power generated by the alternating current generator.