Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1984-08-06
1986-03-04
Shoop, Jr., William M.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318345C, 318439, 318696, H02P 602
Patent
active
045742251
ABSTRACT:
Control circuits for operating electric motors of the class having windings pulsed in sequence and a magnetic field, the class being exemplified by brushless d.c. motors. Improved apparatus is provided for accommodating flyback action when excitation current through any one of the windings is interrupted by the opening of a switch device (e.g., on-off controlled transistor), whether that device be a sequence power switch or a main switch having a common series relation to all of the power switches and operated with an adjustable duty cycle so as to permit adjustment of motor speed and torque. The flyback apparatus, as here disclosed, provides low loss flyback current paths so as to return inductively stored energy back into the winding when its excitation is interrupted, thereby to enhance motor efficiency while eliminating high open circuit voltages across the switching devices. Negative torque which might be created in the flyback circuits as a result of back e.m.f. in a winding is precluded by threshold circuit elements or by timed control of the conductive and non-conductive states of the flyback current paths.
REFERENCES:
patent: 3909690 (1975-09-01), Sugiura
patent: 4107593 (1978-08-01), Anderson
patent: 4121145 (1978-10-01), Talmadge
patent: 4242624 (1980-12-01), Schalk et al.
Holling George H.
Pershall Arthur A.
Pacific Scientific Company
Ro Bentsu
Shoop Jr. William M.
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