| US 7,482,724 B2 | ||
| Ipm electric rotating machine | ||
| Kenji Fujiwara, Hyogo (Japan); Takatoshi Kogure, Hyogo (Japan); Akira Nishio, Hyogo (Japan); and Tutomu Baba, Hyogo (Japan) | ||
| Assigned to Mitsubishi Heavy Industries, Ltd., Tokyo (Japan) | ||
| Appl. No. 10/588,516 PCT Filed Feb. 03, 2005, PCT No. PCT/JP2005/001597 § 371(c)(1), (2), (4) Date Jun. 18, 2007, PCT Pub. No. WO2005/076440, PCT Pub. Date Aug. 18, 2005. |
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| Claims priority of application No. 2004-029016 (JP), filed on Feb. 05, 2004. | ||
| Prior Publication US 2007/0278886 A1, Dec. 06, 2007 | ||
| Int. Cl. H02K 21/14 (2006.01); H02K 21/16 (2006.01); H02K 1/14 (2006.01) | ||
| U.S. Cl. 310—156.45 [310/156.53] | 3 Claims |
| 1. An interior permanent magnet electric rotating machine comprising:
a stator; and
a rotor including a rotor core and a plurality of permanent magnets functioning as a field magnet system,
wherein said rotor has a side face opposed to said stator,
wherein said permanent magnets each have a pole face opposed to said side face,
wherein said permanent magnets are embedded so that a maximum value of a distance from said pole face to said side face satisfies
the following formulas (1a) and (1b) which are represented by a radius r of said rotor n1 and a number of poles of said field magnet system:
x≤D/10, and (1a)
D=2πr/n1, and (1b)
wherein an adjacent two of said permanent magnets, which function as adjacent two poles of said field magnet system, are spaced
apart so that the following formula (2) is satisfied, which is described using a q-axis inductance Lq, and d-axis inductance Ld:
0.3<(Lq−Ld)/Ld (2).
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