Method for operating a delta wound three-phase permanent...

Details Method for operating a delta wound three-phase permanent... Method for operating a delta wound three-phase permanent...

2007-03-05

2009-11-03

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S727000, C318S767000

Reexamination Certificate

active

07612520

ABSTRACT:
Method for operating a delta wound three-phase permanent magnet brushless motor. A transition speed is determined in a quadrant of a speed versus torque curve above which speed continues to increase while current/torque decreases wherein actual phase current can be controlled in a current control modification manner which reduces requested phase current. The modification manner is determined for a quadrant, wherein a controller can use the modification manner to reduce the requested phase current to control the actual phase current when the speed is above the transition speed. The motor is controlled in a quadrant wherein, when the motor has a speed above the transition speed, the controller reduces the requested phase current in the modification manner and the controller supplies the actual phase current to the motor using the reduced requested phase current and using measured phase current of the motor derived from using a single current sense resistor.

REFERENCES:
patent: 6304053 (2001-10-01), Johnson
patent: 6426603 (2002-07-01), Johnson
patent: 6680997 (2004-01-01), Das
patent: 6894455 (2005-05-01), Cai et al.
patent: 7042189 (2006-05-01), Hossain et al.

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