| US 7,598,633 B2 | ||
| AC motor designed to ensure high efficiency in operation | ||
| Shinji Makita, Kakamigahara (Japan); and Masayuki Nashiki, Komaki (Japan) | ||
| Assigned to Denso Corporation, Kariya (Japan) | ||
| Filed on Aug. 01, 2006, as Appl. No. 11/496,423. | ||
| Claims priority of application No. 2005-222738 (JP), filed on Aug. 01, 2005. | ||
| Prior Publication US 2007/0024145 A1, Feb. 01, 2007 | ||
| Int. Cl. H02K 37/14 (2006.01); H02K 17/00 (2006.01) | ||
| U.S. Cl. 310—49R [310/185; 310/257] | 5 Claims |
| 1. An ac motor comprising:
a rotor having rotor magnetic poles which are N-poles and S-poles arranged alternately along a circumference thereof;
a stator having N stator pole groups made up of magnetic poles arranged along a circumference thereof, the N stator pole groups
being shifted in a circumferential direction of said stator relatively from a preselected reference one of the rotor magnetic
poles by different angles, respectively, on a pole basis; and
a plurality of looped windings each of which extends in a circumferential direction of said stator, the looped windings being
disposed adjacent each other in an axial direction of said stator in relation to the N stator pole groups, respectively,
wherein a number P of the rotor magnetic poles and a number M of the magnetic poles of said stator are selected to meet a
relation of M<(P/2)×N.
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