High pole density three phase motor
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United States of America Patent
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-
Nov 17, 1992
Grant Date -
N/A
app pub date -
Jun 14, 1990
filing date -
Jun 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A three phase DC motor (10) including a rotor portion (12) and a stator portion (16). The rotor portion (12) includes 6N.+-.2 permanent magnet poles (32), and the stator portion(16) includes 6N electromagnet poles where N in an integer. The motor (10) is characterized in that it has a high pole density, thus enabling improved efficiency, while retaining acceptable non constant torque characteristics. Since the inventive motor configuration provides for a symmetrical winding pattern, no assymetrical radial forces are produced. The inventive configuration further allows for small motor size in the height dimension. A first preferred embodiment of the motor (10) is adapted for three phase power to be connected to the motor windings (50), (56) and (58) in a 'Y' fashion. An alternate preferred embodiment of the invention (610) has coil windings (650), (656) and (658) connected in delta configuration.
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