公开(公告)号：US20200014314A1

公开(公告)日：2020-01-09

申请号：US16449827

申请日：2019-06-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Hiroaki MURAKAMI ,  Toshihiro TAMITSUJI ,  Yuuya HISATOMI

IPC: H02P6/24 ,  H02K11/26 ,  H02K15/00 ,  H02P6/30

Abstract: A motor drive control device causes a single phase motor including a coil of a first system and a coil of a second system to be driven. The motor drive control device has a first driving circuit configured to perform control to energize the coil of the first system, a second driving circuit configured to perform control to energize the coil of the second system, and a driving control unit configured to control an operation of the first driving circuit and an operation of the second driving circuit. The driving control unit has a driving voltage detecting unit configured to detect a driving voltage applied to the first driving circuit and a driving voltage applied to the second driving circuit, and a compensation control unit configured to cause one driving circuit between the first driving circuit and the second driving circuit to execute a maintenance operation for maintaining rotation of the single phase motor, based on a detection result of the driving voltage detecting unit.

公开(公告)号：US20200014315A1

公开(公告)日：2020-01-09

申请号：US16449781

申请日：2019-06-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Toshihiro TAMITSUJI

IPC: H02P6/30 ,  H02P6/06 ,  H02P6/12 ,  H02P6/26

Abstract: A motor drive control device for driving a single phase motor having a coil of a first system and a coil of a second system includes a first drive circuit configured to control energization to the coil of the first system, a second drive circuit configured to control energization to the coil of the second system, and an adjustment circuit to which a first monitor voltage output from the first drive circuit and a second monitor voltage output from the second drive circuit are input. One or both of the first and second drive circuits has at least one of an input terminal and an output terminal. The adjustment circuit performs an adjustment operation of applying a predetermined voltage to at least one of the input terminal and the output terminal based on the first and second monitor voltages.

公开(公告)号：US20220263450A1

公开(公告)日：2022-08-18

申请号：US17630723

申请日：2020-06-09

Applicant: MINEBEA MITSUMI Inc.

Inventor： Hidetoshi HIJIKATA ,  Toshihiro TAMITSUJI

IPC: H02P27/08

Abstract: The present application makes it possible to measure a PWM signal in a wide frequency range. A PWM signal measurement device (20) includes: a first duty cycle measurement unit (24) of a capture type configured to measure a frequency (f) and a duty cycle of a PWM signal (Sc); a voltage measurement unit (23) configured to measure a smoothed voltage (Vad) obtained by smoothing the PWM signal using a smoothing circuit (13); a second duty cycle measurement unit (25) of a smoothing type configured to measure a duty cycle of the PWM signal on the basis of a measured voltage value (Vadm) of the smoothed voltage; and a measurement-type selecting unit (26) configured to select one of the capture type or the smoothing type on the basis of a measured value of the frequency and a measured value of the smoothed voltage.

公开(公告)号：US20190238074A1

公开(公告)日：2019-08-01

申请号：US16239930

申请日：2019-01-04

Applicant: MINEBEA MITSUMI Inc.

Inventor： Toshihiro TAMITSUJI

IPC: H02P6/16 ,  H02K1/14 ,  H02K3/20 ,  H02K11/215

Abstract: A motor device includes a motor, a motor driving control device and a position detector for outputting a position detection signal. The motor includes magnetic poles (n*6) and coils wound around teeth (n*4) where n is a positive integer. The coils are arranged in a peripheral direction such that the first-system coils and the second-system coils are alternately arranged. The motor driving control device includes a first drive circuit and a second drive circuit, each including an inverter circuit and a control circuit portion. The first drive circuit energizes the first-system coils and the second drive circuit energizes the second-system coils at an energization timing different from that of the first-system coils.

公开(公告)号：US20200280275A1

公开(公告)日：2020-09-03

申请号：US16800269

申请日：2020-02-25

Applicant: MINEBEA MITSUMI Inc.

Inventor： Masahiro TANAKA ,  Yuya HISATOMI ,  Toshihiro TAMITSUJI

IPC: H02P13/10 ,  H02P29/032

Abstract: A motor drive control device driving a motor having a first system coil and a second system coil, the motor drive control device comprising: a first drive circuit controlling energization of the first system coil; a second drive circuit controlling energization of the second system coil; a first temperature sensor detecting a temperature of the first drive circuit; a second temperature sensor detecting a temperature of the second drive circuit; and a signal output circuit outputting an output signal concerning whether or not any one of the first system coil and the second system coil is in an open state, based on a detection result by the first temperature sensor and a detection result by the second temperature sensor.

公开(公告)号：US20230046384A1

公开(公告)日：2023-02-16

申请号：US17759445

申请日：2021-01-22

Applicant: MINEBEA MITSUMI Inc.

Inventor： Yuuya HISATOMI ,  Toshihiro TAMITSUJI ,  Hidetoshi HIJIKATA

IPC: H02P6/17 ,  H02P25/04 ,  H02P29/024 ,  H03K19/20

Abstract: A motor drive control device capable of determining a drive state of a motor is provided. The motor drive control device includes a plurality of motor drive circuits performing, based on drive control signals (Sca1 and Sca2) for controlling the number of rotations of a motor, control of energization of the motor and outputting FG signals (fg1 and fg2) having a cycle corresponding to the actual number of rotations of the motor, a composite signal generation circuit receiving an input of each of the FG signals output from the motor drive circuits and generating a composite signal by combining input signals, and a drive control circuit generating, based on a speed command signal indicating a target number of rotations of the motor, the drive control signals and outputting the drive control signals to each of the motor drive circuits. The FG signals output from the motor drive circuits have a phase difference from each other.

公开(公告)号：US20220170507A1

公开(公告)日：2022-06-02

申请号：US17437165

申请日：2020-03-10

Applicant: MINEBEA MITSUMI Inc.

Inventor： Yuma OHNO ,  Toshihiro TAMITSUJI ,  Yuya HISATOMI

IPC: F16C19/55 ,  F16C19/56 ,  F16C19/52 ,  H02K11/30 ,  H02K5/173 ,  H02K7/08

Abstract: A motor includes a rotor having a rotation shaft, a stator arranged oppositely in a circumferential direction of the rotor, and a pair of bearing portions rotatably supporting the rotation shaft, the pair of bearing portions each include a first bearing being rotatable together with the rotation shaft and a second bearing being rotatable together with the first bearing, the first bearing rotates together with the rotation shaft when the first bearing is normal, and the second bearing as well as the first bearing rotates together with the rotation shaft when the first bearing is abnormal.

公开(公告)号：US20200280271A1

公开(公告)日：2020-09-03

申请号：US16800347

申请日：2020-02-25

Applicant: MINEBEA MITSUMI Inc.

Inventor： Yuya HISATOMI ,  Toshihiro TAMITSUJI

IPC: H02P6/16 ,  H02K3/28

Abstract: A motor drive control device driving a motor having a first system coil and a second system coil, the motor drive control device comprising: a first drive circuit controlling energization of the first system coil; a second drive circuit controlling energization of the second system coil; and a signal output circuit detecting a first voltage that is a voltage at a middle point of the first system coil and a second voltage that is a voltage at a middle point of the second system coil, and outputting an output signal concerning whether or not any one of the first system coil and the second system coil is in an open state, based on a detection result of the first voltage and a detection result of the second voltage.