Abstract:
PROBLEM TO BE SOLVED: To provide a motor drive controller, a motor drive control method, and a motor using them.SOLUTION: A motor drive controller includes a drive signal generating part, a counter electromotive force detecting means, and a control part. The drive signal generating part generates a drive control signal for controlling drive of a motor device. The counter electromotive force detecting means detect counter electromotive force generated from the motor device. The control part estimates drive current of the motor device using the counter electromotive force, and adjusts duty of the drive control signal when the estimated drive current corresponds overcurrent.
Abstract:
PROBLEM TO BE SOLVED: To provide a control device of an alternating current motor capable of detecting positive and negative offset abnormality of a two-phase current sensor.SOLUTION: When offset abnormality occurs in which a positive offset error is generated in one of current detection values of two-phase current sensors 16 and 17 and a negative offset error is generated in the other current detection value, the positive and negative errors are cancelled by each other. Therefore, even when a sum of three-phase current detection values is monitored, abnormality cannot be detected. A positive and negative offset abnormality detection part 601 of a control part 155 of a motor control device compares a dq voltage variation value integrated for one cycle of an electric angle with a predetermined dq voltage variation threshold based on dq voltage commands vd, vqoutputted by a dq current PI control part 23 to variation of the dq current together with offset abnormality, and therefore, the positive and negative offset abnormality can be detected. When abnormality of a current sensor system is defined, the positive and negative offset abnormality detection part 601 instructs shut-down to an inverter 12 so as to stop driving of an alternating current motor 2.
Abstract:
PROBLEM TO BE SOLVED: To provide a motor driving overcurrent detection circuit and a method thereof that can improve efficiency of a motor and reduce distortion of a signal.SOLUTION: A motor driving overcurrent detection circuit includes: a motor driving part 10 which includes a source type switching element group 11 and a sink type switching element group 13, and performs switching operation with a driving control signal to drive a motor M; a distribution sense part 30 which includes a sense resistance connected in series to a distribution switching element, distributes a sensing current with a current flowing through the motor M, and detects the distributed current through the sensor resistance; and an ON resistance holding part 50 which turns ON a distribution switching element connected in parallel to a sink type switching element to be turned ON in the sink type switching element group 13, and holds an ON resistance of the distribution switching element having been turned ON.
Abstract:
An auxiliary artificial heart pump drive device for driving an auxiliary artificial heart pump includes first and second pump control parts which are arranged in duplexed configuration. Each pump control part controls the auxiliary artificial heart pump by outputting a drive signal to the auxiliary artificial heart pump. Each pump control part has a means which, when a failure is detected in the pump control part, electrically cuts off a path through which the drive signal is outputted to the auxiliary artificial heart pump. According to the present invention, it is possible to provide an auxiliary artificial heart pump drive device and an auxiliary artificial heart system which exhibit high availability even when a serious failure occurs by any chance without duplexing a pump device.