Electricity: motive power systems – Synchronous motor systems
Reexamination Certificate
2005-09-06
2005-09-06
Fletcher, Marlon T. (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
C318S780000, C318S787000, C318S813000
Reexamination Certificate
active
06940249
ABSTRACT:
An inverter device capable of smoothly driving an alternating current synchronous motor of large capacity and high-speed rotation is provided. The inverter device includes a power rectification main circuit for converting alternating current power into direct current power and a PWM control inverse transformation main circuit. A transformer raises output terminal of the alternating current power of the inverse transformation main circuit to drive an alternating current synchronous motor. The alternating current motor is started bypassing the transformer and limiting output voltage of the inverse transformation main circuit to a low value through PWM control of the inverse transformation main circuit. After a predetermined time, the bypass circuit is interrupted and switched to a circuit via the transformer, and the output voltage of the inverse transformation main circuit is raised through PWM control of the inverse transformation main circuit, thus the alternating current synchronous motor is brought into normal operation.
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Translation of JP10066372.
Fletcher Marlon T.
McCloud Renata
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