Synchronous motor control method and synchronous motor...

Details Synchronous motor control method and synchronous motor... Synchronous motor control method and synchronous motor...

2007-06-26

2007-06-26

Masih, Karen (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Synchronization systems

C318S701000, C318S727000, C318S700000, C318S716000, C318S718000, C318S717000

Reexamination Certificate

active

11283728

ABSTRACT:
A desired q-axis current is determined based on a desired torque, and a desired d-axis current is determined based on the rotating speed of a synchronous motor when the terminal voltage of the synchronous motor coincides with a predetermined maximum permissible voltage to weaken a magnetic field created by the synchronous motor equivalently and to prevent the drop of the output torque of the synchronous motor. The desired d-axis current is determined based on the desired torque and the rotating speed. Therefore, the desired d-axis current can be reduced when a high torque is not necessary and undesired increase of the desired d-axis current can be prevented. Thus the synchronous motor operates efficiently, heat generation of the synchronous motor is prevented and power factor is improved.

REFERENCES:
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patent: 6605912 (2003-08-01), Bharadwaj et al.
patent: 2004/0201358 (2004-10-01), Kawaji et al.
patent: 2005/0049770 (2005-03-01), Liu et al.
patent: 0 638 457 (1995-02-01), None
patent: A 9-84400 (1997-03-01), None
patent: A 11-018498 (1999-01-01), None

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