公开(公告)号：US20180183368A1

公开(公告)日：2018-06-28

申请号：US15842082

申请日：2017-12-14

Applicant: Minebea Mitsumi Inc.

Inventor： Hiroaki MURAKAMI

IPC: H02P6/185

Abstract: A motor driving control device comprises: an induced voltage detecting unit configured to detect an induced voltage of a motor; a controller for generating a PWM signal corresponding to an energization timing of the motor; and an inverter circuit for outputting a driving signal for driving the motor to the motor based on the PWM signal generated by the controller, wherein the controller comprises: a position detecting unit configured to detect a position detection signal containing a rising or falling edge representing a timing at which a position of a rotor is a predetermined position; measuring unit configured to measure a zero-cross point of the induced voltage of the motor based on a detected timing of the edge of the position detection signal, and stopping output of the driving signal only for a predetermined period containing the zero-cross point of the induced voltage of the motor to measure a pulse width of a regenerated voltage of the motor in the period; a calculating unit configured to calculate a zero-cross point of coil current of the motor based on a measurement result of the measuring unit; and adjusting unit for adjusting the energization timing of the motor based on a calculation result of the calculating unit, the predetermined period being a period of one cycle of the PWM signal.

公开(公告)号：US20240339883A1

公开(公告)日：2024-10-10

申请号：US18249261

申请日：2021-10-22

Applicant: MINEBEA MITSUMI Inc.

Inventor： Takuji YAMADA ,  Hiroaki MURAKAMI ,  Youko TAMURA

IPC: H02K3/34 ,  H02K1/14

CPC classification number: H02K3/34 ,  H02K1/14

Abstract: In a motor of an embodiment, an insulator includes a wall part having two recess parts (an insulator-side first recess part and an insulator-side second recess part) opposed to two drawing positions of a conducting wire drawn out from a coil in a radial direction. One of the two drawing positions is located at an outer peripheral portion of the coil, and the other is located at an inside of the outer peripheral portion. A substrate includes a substrate-side first recess part and a substrate-side second recess part recessed at an inside in the radial direction from an outer peripheral end and adjacent to each other in a circumferential direction. The substrate-side first recess part is opposed to the insulator-side first recess part, and the substrate-side second recess part is opposed to the insulator-side second recess part.

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.