Title:
PERMANENT MAGNET TYPE ROTARY ELECTRIC MACHINE
Document Type and Number:
Japanese Patent JP3840892
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce a cogging torque of a permanent magnet type rotary electric machine.
SOLUTION: The permanent magnet rotary electric machine comprises a stator including a concentrated winding of projected pole, and a rotor 6 including an auxiliary projected pole which is disposed to the stator with a rotating gap, to allow a plurality of permanent magnets 8 and non-magnetic portions to be fixed in the circumferential direction within an accommodating hole formed by punching the rotor iron core. A ratio of the number of poles of the rotor to the number slots of stator is set to P (multiple of 2):M (multiple of 3). The permanent magnet is divided to two sections in the stacking direction and the disposition of permanent magnets, and non-magnetic portions is reversed. When the least common multiples of P and M are defined as gcd (P, M) and gcd (P, M)/P=x, the ratio of the length (b) in the circumferential direction of the accommodating hole formed by punching the rotor iron core to the length (a) of the non-magnetic portion is set.
Inventors:
Yutaka Matsunobu
Fumio Tajima
Shoichi Kawamata
Osamu Koizumi
Takashi Yasuhara
Fumio Tajima
Shoichi Kawamata
Osamu Koizumi
Takashi Yasuhara
Application Number:
JP2000334909A
Publication Date:
November 01, 2006
Filing Date:
October 30, 2000
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H02K1/22; H02K21/14; H02K1/27; (IPC1-7): H02K21/14; H02K1/22; H02K1/27
Domestic Patent References:
| JP11103543A | ||||
| JP61199447A |
Attorney, Agent or Firm:
Manabu Inoue