Title:
モータ
Document Type and Number:
Japanese Patent JP7162482
Kind Code:
B2
Abstract:
One embodiment of the motor according to the present invention is provided with: a rotor having a bottomed cylindrical rotor core and a hollow cylindrical magnet, said rotor core having a shaft extending along the central axis, said magnet being provided on the inner circumferential side of the rotor core; a detection element for detecting the magnetic flux density of the magnet; and a signal output unit for outputting a signal relating to the rotational speed of the rotor on the basis of the magnetic flux density. The magnet has a first pole and a second pole which are alternately disposed along the circumferential direction and includes a first magnetization boundary portion where the first pole and the second pole are aligned in a direction opposite to the rotational direction and a second magnetization boundary portion where the second pole and the first pole are aligned in the direction opposite to the rotational direction, wherein, when viewed in a plan view from a direction along the central axis, the first magnetization boundary portion is positioned on the line passing through the magnet central axis, which passes through the center of the magnet, and the central axis.
Inventors:
Rina Maruyama
Taro Tanno
Seiji Kojima
Satoshi Kidoma
Taro Tanno
Seiji Kojima
Satoshi Kidoma
Application Number:
JP2018183961A
Publication Date:
October 28, 2022
Filing Date:
September 28, 2018
Export Citation:
Assignee:
Nippon Densan Servo Co., Ltd.
Koito Manufacturing Co., Ltd.
Koito Manufacturing Co., Ltd.
International Classes:
H02K29/08
Domestic Patent References:
| JP2006311665A | ||||
| JP2018148682A | ||||
| JP2006191738A | ||||
| JP2003230239A | ||||
| JP2016123206A |
Attorney, Agent or Firm:
Patent Attorney Shiga International Patent Office