Panasonic Intellectual Property Management Co., Ltd.

Daisuke Sonoda

Mitsuhiro Sakamoto

Yasuyuki Yokouchi

Toru Tazawa

Yasushi Kato

Taro Kishibe

Ryuta Sasaki

Hideaki Ichikawa

Masashi Mishima

Ryuhei Watabe

A communication device includes a processing part and a communication part that communicates with one or more slaves. The processing part has a function of executing communication processing and setting processing. The communication processing is processing for transmitting a main frame including main data from the communication part to one or more slaves in a first period. The setting processing is processing for setting a second period shorter than the first period and a time slot allocated to at least one slave among the one or more slaves in every second period.

Communication device, communication system, communication and control method

A motor control device at least includes a speed control part for controlling a motor rotation speed. The motor control device includes a torque correction means for suppressing variation in torque constant due to individual differences of motors. In addition, the motor control device corrects the torque constant by using a correction torque coefficient calculated based on an unloaded speed when a fixed voltage is applied. Alternatively, the torque constant is corrected using the correction torque coefficient calculated based on the motor applied voltage when the motor speed is fixed.

Motor control device, and method for correcting torque constant in such motor control device

Provided is a motor drive device which performs switching, with respect to a synchronous motor including a stator around which a motor winding is wound and a rotor holding a permanent magnet, from a synchronous operation in which the synchronous motor is synchronously driven to position-sensorless vector control in which a current supplied to the motor winding is controlled based on a position of the rotor. During the synchronous operation, the present motor drive device calculates, by estimation, an induced voltage error based on the detected current and voltage, performs control of an amplitude of a current instruction such that an error, of a target induced voltage, calculated based on an estimated induced voltage and based on an internal angle becomes equal to the induced voltage error, and switches the mode to the sensorless mode after the error is reduced to be within a range of a predetermined value. Further, by gradually reducing the current instruction during the synchronous operation, the absolute value of the induced voltage error is reduced to be within a range of the predetermined value.

Motor drive device and brushless motor

A motor driving device of the present invention is a motor driving device that incorporates so-called vector control of controlling a current applied to a motor winding in accordance with the position of a rotor. The motor driving device receives the input of a duty command value from a host controller via a command input port, for example. The motor driving device obtains a current command or a speed command as a command value such that the input duty command value is equal to the duty of a drive pulse output from an inverter. Then, the motor driving device performs vector control based on the obtained command value.

Growing community of inventors

Osaka, Japan

Daisuke Sonoda