Invention Grant
- Patent Title: Motor that suppresses demagnetization of permanent magnet, fan, and air conditioner
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Application No.: US17059511Application Date: 2018-06-27
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Publication No.: US11949290B2Publication Date: 2024-04-02
- Inventor: Takaya Shimokawa , Hiroki Aso , Ryogo Takahashi , Kazuma Nomoto
- Applicant: Mitsubishi Electric Corporation
- Applicant Address: JP Tokyo
- Assignee: Mitsubishi Electric Corporation
- Current Assignee: Mitsubishi Electric Corporation
- Current Assignee Address: JP Tokyo
- Agency: POSZ LAW GROUP, PLC
- International Application: PCT/JP2018/024407 2018.06.27
- International Announcement: WO2020/003414A 2020.01.02
- Date entered country: 2020-11-30
- Main IPC: H02K1/276
- IPC: H02K1/276 ; H02K1/2746 ; H02K1/28 ; H02K7/14 ; H02K9/06 ; H02K11/33

Abstract:
A motor includes a rotor and a stator provided to surround the rotor. The rotor has a rotor core having a magnet insertion hole and a permanent magnet disposed in the magnet insertion hole and is rotatable about a rotation axis. The stator has a stator core with a tooth facing the rotor, and a coil wound around the tooth. The permanent magnet has a thickness thicker than or equal to 2.1 mm in a direction in which the permanent magnet faces the stator and is magnetized in a direction of the thickness. A minimum gap AG (mm) between the rotor and the stator, a winding number Nt of the coil around the tooth, an overcurrent threshold Ip (A) for a current flowing through the coil, and a lower limit Hct (kA/m) of a coercive force of the permanent magnet satisfy Hct≥0.4×(Ip×Nt/AG)+410.
Public/Granted literature
- US20210211003A1 MOTOR, FAN, AND AIR CONDITIONER Public/Granted day:2021-07-08
Information query
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