MOTOR

WIPO Patent Application WO/2020/067274

A1

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.

JPS6477453	MINIATURE 2-PHASE SEMICONDUCTOR MOTOR
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JP5151486	Brushless electromachines, devices, mobiles, and robots

MARUYAMA RINA (JP)
TANNO TARO (JP)
KOJIMA SEIJI (JP)
KIDOMA SATOSHI (JP)

PCT/JP2019/037826

April 02, 2020

September 26, 2019

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NIDEC SERVO CORP (JP)
KOITO MFG CO LTD (JP)

H02K29/08

JP2006311665A	2006-11-09
JP2018148682A	2018-09-20
JP2006191738A	2006-07-20
JP2003230239A	2003-08-15
JP2016123206A	2016-07-07

OIKAWA Shu et al. (JP)

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