公开(公告)号：US20210095661A1

公开(公告)日：2021-04-01

申请号：US17022104

申请日：2020-09-16

Applicant: NIDEC TOSOK CORPORATION

Inventor： Yasuhiro SHIRAI ,  Koji HIGUCHI

IPC: F04B49/06 ,  F04B17/03

Abstract: A control device is provided for controlling a rotation speed of an electric oil pump, including a motor and a pump mechanism connected to the motor, based on a command value input from a host device. The control device includes: a first calculator calculating a first duty value of current to be output to the motor based on a deviation between the command value and a rotation speed of the motor; a second calculator calculating a second duty value of current to be output to the motor based on a deviation between a current limit value of the motor and a current value of the motor; and a drive current determiner comparing the first duty value calculated by the first calculator and the second duty value calculated by the second calculator, and selecting the lower duty value as a duty value of current that drives the motor.

公开(公告)号：US20190214926A1

公开(公告)日：2019-07-11

申请号：US16333599

申请日：2017-09-25

Applicant: Nidec Tosok Corporation

Inventor： Kei SATO ,  Yuichi HIBI ,  Yasuhiro SHIRAI

IPC: H02P6/10 ,  H02P6/16 ,  F04B43/04

Abstract: A control device to control a motor includes a stator including a coil, a rotor including a permanent magnet, a detector that detects a rotational position of the rotor at every predetermined angle and outputs a position signal indicating the detected rotational position, and a controller that receives the position signal output by the detector and adjusts a duty ratio of a driving signal of the rotor by a pulse width modulation scheme based on the received position signal to control rotation of the rotor. The controller raises the duty ratio from a first duty ratio, starting from a point in time at which the position signal is received, and returns the raised duty ratio to the first duty ratio when a next position signal has been received.

公开(公告)号：US20210095649A1

公开(公告)日：2021-04-01

申请号：US17017709

申请日：2020-09-11

Applicant: NIDEC TOSOK CORPORATION

Inventor： Masaya Furushou ,  Yasuhiro SHIRAI

IPC: F04B17/03 ,  B60W10/30 ,  F04B49/02 ,  F16H57/04

Abstract: A control device for a motor unit provided in a vehicle is disclosed. The motor unit includes a motor including multiple coils provided side by side around a motor axis; a transmission mechanism transmitting power of the motor to an axle; a housing housing the motor and the transmission mechanism; an electric oil pump delivering oil stored in the housing; and a coil temperature sensor detecting a temperature of the coil. The control device includes a motor controller driving and controlling the motor; and a pump controller driving and controlling the electric oil pump. The pump controller estimates an oil temperature according to an ambient temperature and the temperature of the coil, and determines a start timing of the electric oil pump based on an estimated oil temperature.

公开(公告)号：US20200018304A1

公开(公告)日：2020-01-16

申请号：US16335275

申请日：2017-09-25

Applicant: Nidec Tosok Corporation

Inventor： Kei SATO ,  Yuichi HIBI ,  Yasuhiro SHIRAI

IPC: F04B49/06 ,  F04B35/04 ,  H02P6/16

Abstract: A controller of a motor control device increases a voltage to be applied to a coil based on a control signal calculated from an estimated rotation speed, when the estimated rotation speed becomes equal to or lower than a predetermined rotation speed, increases the voltage to be applied to the coil based on a control signal calculated from an actual rotation speed, in a case where the actual rotation speed is lower than the predetermined rotation speed when the estimated rotation speed becomes higher than the predetermined rotation speed, and decreases the voltage to be applied to the coil based on a control signal calculated from the actual rotation speed, in a case where the actual rotation speed is higher than the predetermined rotation speed when the estimated rotation speed becomes higher than the predetermined rotation speed.

公开(公告)号：US20220416704A1

公开(公告)日：2022-12-29

申请号：US17841665

申请日：2022-06-16

Applicant: NIDEC TOSOK CORPORATION

Inventor： Yasuhiro SHIRAI

IPC: H02P23/14 ,  H02P3/18

Abstract: One aspect of a motor control device according to the present invention is a motor control device that controls a motor of an electric pump. The motor control device includes a drive unit that supplies a drive current to the motor; a control unit that controls a rotation speed of the motor by controlling the drive unit based on a rotation speed command value; and a current detection unit that detects the drive current supplied to the motor, and supplies a current detection value indicating a detection result of the drive current to the control unit. The control unit determines whether or not a foreign fluid suction abnormality occurs in the electric pump, based on a first current detection value acquired at a first timing when the rotation speed command value changes from a first command value to a second command value and a second current detection value acquired after the first timing.

公开(公告)号：US20210099125A1

公开(公告)日：2021-04-01

申请号：US17017708

申请日：2020-09-11

Applicant: NIDEC TOSOK CORPORATION

Inventor： Yoshiyuki KOBAYASHI ,  Yasuhiro SHIRAI ,  Tadayuki HATSUDA

IPC: H02P29/68 ,  F04D13/06 ,  F04D15/00

Abstract: A motor driving device for driving a motor is provided. The motor driving device includes: a driver outputting a drive signal for driving the motor to the motor; and a controller controlling a duty ratio of the drive signal based on three control parameters which are an initial duty ratio, a duty ratio increasing speed, and a target duty ratio. The controller has a normal control mode in which each of the three control parameters is a predetermined value, and a cryogenic control mode in which at least one of the three control parameters is a smaller value than in the normal control mode.