公开(公告)号：US20170214343A1

公开(公告)日：2017-07-27

申请号：US15328149

申请日：2015-08-28

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： DAISUKE SONODA ,  MITSUHIRO SAKAMOTO ,  TORU TAZAWA

IPC: H02P6/18 ,  H02P27/06 ,  H02P21/24

CPC classification number: H02P6/18 ,  H02P21/24 ,  H02P27/06

Abstract: 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.

公开(公告)号：US20170163194A1

公开(公告)日：2017-06-08

申请号：US15325309

申请日：2016-01-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： MITSUHIRO SAKAMOTO ,  YASUYUKI YOKOUCHI ,  DAISUKE SONODA ,  RYUTA SASAKI

IPC: H02P21/00 ,  H02P6/08 ,  H02P27/06

CPC classification number: H02P21/0025 ,  H02P6/08 ,  H02P21/00 ,  H02P21/20 ,  H02P23/0031 ,  H02P27/06 ,  H02P2205/05

Abstract: 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.

公开(公告)号：US20230318510A1

公开(公告)日：2023-10-05

申请号：US18042789

申请日：2021-07-07

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： MITSUHIRO SAKAMOTO

IPC: H02P27/08 ,  H02P23/24

CPC classification number: H02P27/085 ,  H02P23/24

Abstract: A motor including a first terminal and a second terminal to which a single-phase AC is input includes a third terminal, an AC/DC converter that converts a single-phase AC into a DC, an inverter that is PWM-controlled by a PWM signal to convert the DC into a three-phase AC, a controller that outputs a PWM signal to the inverter, and a detection circuit connected to the third terminal, in which the detection circuit outputs any one of a first detection signal, a second detection signal, and a third detection signal, and the controller outputs a PWM signal to be in a first rotation state when the detection circuit outputs the first detection signal, to be in a second rotation state when the detection circuit outputs the second detection signal, and to be in a third rotation state when the detection circuit outputs the third detection signal.

公开(公告)号：US20170214358A1

公开(公告)日：2017-07-27

申请号：US15328334

申请日：2015-09-02

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： YOSHIKAZU SENGOKUDANI ,  MITSUHIRO SAKAMOTO ,  HIDEHARU HIWAKI

IPC: H02P29/68 ,  D06F37/40 ,  H02P6/20 ,  D06F33/02

CPC classification number: H02P29/68 ,  D06F33/02 ,  D06F37/40 ,  H02P6/20 ,  H02P29/032

Abstract: A brushless motor for a washing machine is provided, and the brushless motor includes: a motor including a stator around which a winding wire is wound and a rotor holding a permanent magnet; a motor control microcomputer; an inverter circuit in which a power element is incorporated and controls an amount of a voltage applied to the winding wire; a temperature detecting element which detects a temperature of the power element; and a current detecting element which detects a power supply current or a current of the winding wire. A first current limit value is defined by current limit value which is set such that a junction temperature of the power element does not exceed a predetermined value on a premise that the brushless motor performs a continuous operation, the brushless motor sets a second current limit value which is higher than the first current limit value, and the brushless motor operates, based on the second current limit value only in a predetermined period after start-up of the brushless motor.