Permanent-magnet rotating machine

Details Permanent-magnet rotating machine Permanent-magnet rotating machine

2007-03-27

2007-03-27

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S216006, C310S216055, C310S254100

Reexamination Certificate

active

11415139

ABSTRACT:
A permanent-magnet rotating machine includes a rotor having a rotor core carrying on a curved outer surface multiple permanent magnets arranged in two rows along an axial direction. The permanent magnets in one row are skewed from those in the other row in a circumferential direction by a row-to-row skew angle (electrical angle) θe. A stator having a tubular stator core in which the rotor disposed, includes stator coils for producing a rotating magnetic field for rotating the rotor. A lower limit of the row-to-row skew angle θe larger than 30 degrees (electrical angle). A ratio, of cogging torque occurring in the absence of skew to cogging torque occurring when the permanent magnets are skewed, at a row-to-row skew angle of 30 degrees is calculated based on the cogging torque ratio, the row-to-row skew angle θe, and B-H curve properties of the stator core. An upper limit of the row-to-row skew angle θe is not larger than the maximum value at which the cogging torque ratio does not exceed the calculated cogging torque ratio at 30 degrees.

REFERENCES:
patent: 5355044 (1994-10-01), Uchida et al.
patent: 5821710 (1998-10-01), Masuzawa et al.
patent: 6462452 (2002-10-01), Nakano et al.
patent: 6657349 (2003-12-01), Fukushima
patent: 6707209 (2004-03-01), Crapo et al.
patent: 6853105 (2005-02-01), Nakano et al.
patent: 7067948 (2006-06-01), Yamaguchi et al.
patent: 61-17876 (1986-02-01), None
patent: 2-106152 (1990-04-01), None
patent: 4-21330 (1992-05-01), None
patent: 4-255440 (1992-09-01), None
patent: 8-251847 (1996-09-01), None
patent: 2000-308286 (2000-11-01), None
patent: WO 02/41471 (2002-05-01), None

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