Method and apparatus for switching a motor between bipolar and u

Details Method and apparatus for switching a motor between bipolar and u Method and apparatus for switching a motor between bipolar and u

1994-10-27

1997-04-01

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318439, H02P 600

Patent

active

056169930

ABSTRACT:
A method and apparatus for switching a motor between bipolar and unipolar mode. During each phase of the bipolar mode, one of the coils floats and has a back emf. In the method, first, a mode change signal requesting a change between the bipolar mode and the unipolar mode is received. Second, the back emf across the floating coil is monitored. Third, a point in time when the back emf equals the center tap voltage is detected. Last, the motor is switched between the bipolar mode and the unipolar mode at a point away from point in time when the back emf across the floating coil equals the center tap voltage. Various circuitry is also disclosed for switching a motor between a bipolar mode and a unipolar mode.

REFERENCES:
patent: 5210474 (1993-05-01), Oswald
patent: 5225759 (1993-07-01), Endo et al.

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