Method of starting a synchronous motor with a brushless DC...

Details Method of starting a synchronous motor with a brushless DC... Method of starting a synchronous motor with a brushless DC...

2011-07-12

2011-07-12

Benson, Walter (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

C318S712000, C318S718000, C318S721000, C318S268000, C318S270000, C322S010000, C322S029000, C322S089000

Reexamination Certificate

active

07977910

ABSTRACT:
A starting method and system for a motor where the motor may be started as an induction motor by applying a magnetizing current to build flux through the stator, with the field current set at the maximum permissible exciter stator current (i.e., the current that will cause rated no-load current in the main field at the transition speed). The motor stator currents will be maintained at a value that allows the motor to generate sufficient breakaway torque to overcome any stiction. At a specific transition speed or after a period of time, the drive will initiate a transition from induction motor control to synchronous motor control by removing the initial magnetizing current, and a field current is then applied to the motor through the DC exciter. Once this transition is completed, the drive may ramp up to the desired speed demand.

REFERENCES:
patent: 3582735 (1971-06-01), Maruschak
patent: 5594322 (1997-01-01), Rozman et al.
patent: 2002/0074803 (2002-06-01), Kajiura
patent: 2003/0209910 (2003-11-01), Nelson
patent: 1717944 (2006-11-01), None
patent: 2007037274 (2007-02-01), None

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