Title:
ELECTRIC MOTOR, BLOWER, AND AIR CONDITIONING DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/195076
Kind Code:
A1
Abstract:
This electric motor has a shaft, a rotor having a rotor magnet secured to the shaft, and a stator that surrounds the rotor from the outside in the radial direction centered on the shaft. The rotor magnet has: a first magnet that is magnetized to have a polar anisotropic orientation; and P second magnets (where P is an even number) that are arranged around the periphery of the first magnet, magnetized to have the polar anisotropic orientation, and have stronger magnetic poles than the first magnet. The stator has a stator core, and a coil wound around the stator core. A length Hr of rotor magnet in the axial direction of the shaft and an axial-direction length Hs of the stator core satisfy Hr>Hs. The rotor magnet has, in the axial direction, a stator-facing portion that faces the stator core in the radial direction, and an overhang portion that projects from the stator core in the axial direction. The volume ratio of the second magnet to the first magnet is smaller in the overhang portion than in the stator-facing portion.
Inventors:
WATANABE TAKANORI (JP)
TSUCHIDA KAZUCHIKA (JP)
SHIMOKAWA TAKAYA (JP)
TAKAHASHI RYOGO (JP)
TSUCHIDA KAZUCHIKA (JP)
SHIMOKAWA TAKAYA (JP)
TAKAHASHI RYOGO (JP)
Application Number:
PCT/JP2022/017114
Publication Date:
October 12, 2023
Filing Date:
April 05, 2022
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02K1/2733; H02K1/278
Domestic Patent References:
| WO2020129123A1 | 2020-06-25 | |||
| WO2018134988A1 | 2018-07-26 |
Foreign References:
| JP2016219607A | 2016-12-22 |
Attorney, Agent or Firm:
YAMAGATA Yoichi et al. (JP)
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