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Title:
MOTOR
Document Type and Number:
Japanese Patent JP2020054184
Kind Code:
A
Abstract:
To provide a motor capable of reducing deterioration of rotational accuracy of a FG signal, even when eccentricity occurs during rotation of the rotor.SOLUTION: A motor comprises a rotor including a lidded cylindrical rotor core having a shaft extending along the medial axis, and a hollow cylindrical magnet 6 provided in the inner peripheral side of the rotor core, a detection element for detecting flux density of the magnet, and a signal output part for outputting a signal relevant to the revolution of the rotor on the basis of the flux density. The magnet includes a first magnetization boundaries 16a, 16b where the first poles 6s and the second poles 6n are placed alternately in the hoop direction, and the first poles and the second poles are placed in the inverse direction of the rotation direction and second magnetization boundaries 17a, 17b where the second poles and the first poles are placed in the inverse direction of the rotation direction, and in the plan view from the direction along the medial axis, the first magnetization boundaries are located on the magnet center axis passing the center of the magnet and a straight passing the center axis.SELECTED DRAWING: Figure 6

Inventors:
MARUYAMA RINA
TANNO TARO
KOJIMA SEIJI
KIDOMA SATOSHI
Application Number:
JP2018183961A
Publication Date:
April 02, 2020
Filing Date:
September 28, 2018
Export Citation:
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Assignee:
NIDEC SERVO CORP
KOITO MFG CO LTD
International Classes:
H02K29/08
Attorney, Agent or Firm:
Shiga International Patent Office



 
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