Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-08-30
1991-07-23
Beha, Jr., William H.
Electrical generator or motor structure
Dynamoelectric
Rotary
310152, 310261, H02K 1502
Patent
active
050346423
ABSTRACT:
A permanent magnet rotor for an electric motor includes longitudinally extending main rotor field and sensor field sections, the sensor field section being substantially shorter than the main rotor field section and being disposed at one end thereof. The sensor field section is magnetized in circumferentially disposed parallel strips of alternating magnetic polarity around the rotor. The main rotor field section has longitudinally extending strips of alternating magnetic polarity which are skewed in a predetermined pattern. The predetermined pattern includes a first portion in which each longitudinally extending strip runs generally at a first predetermined non-zero angle with respect to the longitudinal axis of the rotor, a second portion in which each longitudinally extending strip runs generally at a second predetermined non-zero angle with respect that axis, and a third portion in which each longitudinally extending strip runs generally at the first predetermined non-zero angle with respect to the axis. The first and second angles are opposite in sign.
REFERENCES:
patent: 4079274 (1978-03-01), Richmond
patent: 4130769 (1978-12-01), Karube
patent: 4364005 (1982-12-01), Kohzai et al.
patent: 4625392 (1986-12-01), Stokes
patent: 4823038 (1989-04-01), Mizutani et al.
Eckles Scott E.
Hoemann Keith I.
Beha Jr. William H.
Emerson Electric Co.
Nguyen Matthew
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