An electric motor drive control device includes: an inverter circuit that converts DC power inputted via a DC bus to multiphase AC power and outputs the multiphase AC power to an electric motor; a current detector that detects a DC current flowing in the DC bus; a PWM generator that generates PWM signals and outputs the PWM signals to the inverter circuit; a current calculator that calculates a current value for each of phases to be flowed to the electric motor based upon a value of the DC current and the PWM signals; and a current controller that generates a command signal based upon the current value, and outputs the command signal to the PWM generator, wherein: if one of the phases of the AC power has become missing, the current calculator determines which phase is one that has become missing and calculates current values for other phases.

A motor control device includes a motor drive circuit including an upper arm and a lower arm, an arithmetic processor to control the motor drive circuit, an alternative circuit that can operate as a substitute to replace the arithmetic processor, and a mode switch to switch a control mode between a first control mode, in which the arithmetic processor controls the motor drive circuit, and a second control mode, in which the alternative circuit controls the motor drive circuit, based on a state of the arithmetic processor. The mode switch switches the control mode from the first control mode to the second control mode when a state of the arithmetic processor changes from a normal state to an abnormal state.

The objective of the present invention is to provide an electric power converting device with which can executes a ground fault detection in a short time with its inexpensive configuration. In one step, the electric power converting device performs level comparison of a difference between output values of low pass filters, with a threshold value −E. If a W-phase is shorted to ground at a time when the U-phase and V-phase lower arm IGBTs are ON and W-phase upper IGBT is ON, the difference between the output values of the low pass filters and becomes small. In another step, a level comparison is made between the absolute value of a difference between the U-phase current value iu and U-phase current command value iu′, and a threshold value F. If the absolute value is lower than the threshold value, the result is determined to be normal, and if the absolute value is greater than the threshold value, the result is determined to be abnormal, because the U-phase is shorted to ground. In another step, a level comparison is made between the absolute value of a difference between the V-phase current iv and the V-phase current command value iv′, and a threshold value F. If the absolute value is lower than the threshold value, the result is determined to be normal, and if the absolute value is greater than the threshold value, the result is determined to be abnormal, because the V-phase is shorted to ground.

The invention results in improved switching from the idling mode to an active short circuit mode of an electric machine. According to the invention, the switch from the idling mode to the active electric short circuit mode is delayed until predefined voltage conditions have been reached on the external terminals of an electric machine or until the rotor of the electric machine is in a predetermined position corresponding to the required voltage conditions.

A motor drive controller including a monitoring unit monitoring whether or not a use state of a motor to be controlled satisfies a predetermined condition, and an output information switching unit switching information to be outputted to the outside from an information output path from motor driving information indicating a drive state of the motor to monitoring information indicating the use state if the use state satisfies the predetermined condition.

A motor control device includes: an inverter circuit including a semiconductor switching element for drive which drives a motor; a cut-off circuit including a semiconductor switching element for cut-off which cuts off an electric connection between the motor and the inverter circuit; a failure detection unit; a rotation number detection unit; and a control unit. In a case where the failure detection unit detects a failure of the semiconductor switching element for drive, the control unit turns off the semiconductor switching element for drive, and in a case where the number of rotations of the motor which is detected by the rotation number detection unit is less than a predetermined first threshold, the control unit further turns off the semiconductor switching element for cut-off.

A motor drive controller according to one aspect of the present disclosure including a monitoring unit monitoring a motor and detecting that the motor is in a driving state but is also in a predetermined abnormal state; and a incomplete lock determination unit executing a determination program at a point of time when the abnormal state is detected and causing the determination program to determine whether or not the motor is in an incomplete locked state in which a load not sufficient to stop the motor is applied to a rotating body rotated by driving of the motor.

A wiper motor control circuit carries out control in which a driving circuit generates, and supplies to a wiper motor, a voltage that eliminates deviation between a target speed and an actual speed of an output shaft. In a case in which a state in which the deviation between the target speed and the actual speed is greater than or equal to a predetermined threshold value continues for a predetermined time or more, the wiper motor control circuit carries out control that lowers the target speed and in which the driving circuit generates, and supplies to the wiper motor, a voltage that eliminates deviation between the lowered target speed and the actual speed of the output shaft.

A motor control apparatus according to one aspect of the present invention is configured to be connected to a motor by a wiring line, and includes: a motor driving unit for driving a motor; a current command unit for commanding supply of current to the motor driving unit; and, a miswiring detecting unit for detecting miswiring of lines connected to motors by acquiring via wiring lines a signal indicating the motor temperature detected by a motor temperature detector provided for the motor, wherein the miswiring detecting unit detects presence or absence of miswiring of the wiring lines, based on the change of the motor temperature when the current command unit commands supply of reactive current to the motor driving unit.

The invention relates to a method and to a device for changing from the idle operating state of an electric motor (5) having three phase terminals (5-1, 5-2, 5-3) to a short-circuit operating state. Thereby significant voltage rises are avoided. For this purpose, after receiving (120) a request for changing of the operating state of the electric motor (5) to the short-circuit operating state, three switching elements (1-1, 1-2, 1-3) are closed. Thereby the switching elements (1-1, 1-2, 1-3) are at least partially closed successively and the times of closing the individual switching elements are predetermined as a function of control parameters of the electric motor.