Synchronous motor and a rotation control method thereof, as...

Details Synchronous motor and a rotation control method thereof, as... Synchronous motor and a rotation control method thereof, as...

2006-09-05

2006-09-05

Masih, Karen (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

C318S700000, C318S801000, C318S432000, C318S434000

Reexamination Certificate

active

07102319

ABSTRACT:
A rotation control method of a synchronous motor, the motor comprising: a stator having AC windings thereround; and a rotor, being mounted within said stator, rotatably, wherein on an each surface, opposing to the rotor, of poles building up the stator, are formed plural numbers of teeth portions, and on a surface of the rotor, being made of permanent magnet, opposing to the poles of the stator, are also formed plural numbers of teeth portions, with a width being nearly equal to that of the teeth portion in a circumference direction thereof, and further AC voltages having a predetermined voltage-frequency characteristic is supplied to AC windings wound around the poles of the stator, and the AC voltages supplied from the inverter is so determined in the voltage-frequency characteristic thereof, at least within a part of frequency band equal or less than a predetermined rated frequency, a pull-out torque of the synchronous motor is equal to or greater that a rated pull-out torque at the predetermined rated frequency, thereby providing a synchronous motor and also an inverter to be used for such the synchronous motor, but hardly causing the step-out phenomenon in the operating condition when accelerating and decelerating the synchronous motor.

REFERENCES:
patent: 6700272 (2004-03-01), Lindner
patent: 2001/0022507 (2001-09-01), Marinus et al.
patent: 57-180395 (1982-11-01), None
patent: 1-14775 (1989-04-01), None

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