Method and apparatus for electronically commuting an electric mo

Details Method and apparatus for electronically commuting an electric mo Method and apparatus for electronically commuting an electric mo

1996-11-12

1998-05-12

Shoop, Jr., William M.

Electricity: motive power systems

Limitation of motor load, current, torque or force

318138, 318254, H01R 3946

Patent

active

057511284

ABSTRACT:
In a method for operating an electric motor especially a permanent magnet motor, the voltage applied to the windings of the stator of the motor are commuted electronically. The timing of the commutation events is determined by sensing and low pass filtering the differential voltages between the windings and detecting the zero crossings of the filtered differential voltages. At the time the zero crossings take place or within a short time afterwards the commutation events take place.

REFERENCES:
patent: 4446406 (1984-05-01), Uzuka
patent: 4743815 (1988-05-01), Gee et al.
patent: 5221881 (1993-06-01), Cameron
patent: 5376866 (1994-12-01), Erdman
patent: 5517095 (1996-05-01), Carobolante et al.

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