Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1989-05-09
1991-08-06
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310156, H02K 2114
Patent
active
050380656
ABSTRACT:
A rotor of a permanent magnet type synchronous motor facing a stator having a number of slots comprises a rotor core fixed to a motor shaft and an even number of permanent magnets in a circumferential direction of the rotor core. Projecting portions are formed in the shape of a protruding portion of the rotor core over each permanent magnet. The width (A) of each projecting portion is different from the pitch (B) of the slots of the stator. A position detector for detecting the permanent magnet position of the rotor comprises detectors of the normal rotation and other detectors of the reverse rotation. These detectors are arranged having predetermined phase differences (.alpha., .beta.) to a center line. A pattern generating circuit is provided for switching the conducting position to the stator winding corresponding to the phase differences.
REFERENCES:
patent: 4486678 (1984-12-01), Olson
patent: 4543506 (1985-09-01), Kawada et al.
patent: 4700097 (1987-10-01), Kawada et al.
Kubokura Kuniaki
Matsubayashi Jun
Miyashita Kunio
Tajima Fumio
Takada Kazuaki
Hitachi , Ltd.
Hitachi Taga Engineering Ltd.
Rebsch D. L.
Stephan Steven L.
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