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Title:
PERMANENT MAGNET SYNCHRONOUS MACHINE AND ELECTRIC MOTOR VEHICLE EQUIPPED WITH SAME
Document Type and Number:
WIPO Patent Application WO/2019/069573
Kind Code:
A1
Abstract:
The purpose of the present invention is to reduce magnet cost while maximizing the output torque of a permanent magnet synchronous machine. Therefore, a permanent magnet synchronous machine 100 of the present invention is provided with: a stator 109 having stator coils wound around a plurality of teeth; and a rotor 101 equipped with a plurality of permanent magnets 103 and a plurality of permanent magnet housing holes 104 in the circumferential direction, said permanent magnet housing holes 104 housing the permanent magnets 103. The rotor 101 has a plurality of magnetic poles 108 disposed along the circumferential direction. In the permanent magnet synchronous machine 100, the ratio τm/τp between the opening angle τp of the magnetic poles 108 and the opening angle τm of the permanent magnets 103 satisfies equation (1), and a reluctance torque ratio α, which is defined by equation (2) using a stator coil interlinkage magnetic flux ψp generated by the permanent magnets 103 and a direct axis inductance Ld and a quadrature axis inductance Lq when energized by current I (Arms), is set to 0.60 or more.

Inventors:
TAKAHASHI Akeshi (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
ITO Makoto (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
SUGIMOTO Shinji (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
Application Number:
JP2018/030998
Publication Date:
April 11, 2019
Filing Date:
August 22, 2018
Export Citation:
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Assignee:
HITACHI, LTD. (6-6 Marunouchi 1-chome, Chiyoda-ku Tokyo, 80, 〒1008280, JP)
International Classes:
H02K1/27; H02K1/22; H02K19/10
Domestic Patent References:
WO2014065102A12014-05-01
Foreign References:
JP2012115070A2012-06-14
JP2011101504A2011-05-19
JP2009213256A2009-09-17
JP2017093099A2017-05-25
Attorney, Agent or Firm:
POLAIRE I.P.C. (13-11, Nihonbashikayabacho 2-chome Chuo-k, Tokyo 25, 〒1030025, JP)
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