Shunt-type speed control circuit having transient storage effect

Details Shunt-type speed control circuit having transient storage effect Shunt-type speed control circuit having transient storage effect

1995-10-23

1997-12-30

Ip, Paul

Electricity: motive power systems

Alternating current commutating motors

Universal or a.c.-d.c. motors

318 251, 318530, 318250, 318252, H02P 118, H02P 701, H02K 2300

Patent

active

057034486

ABSTRACT:
The series field winding of a compound or series motor includes a plurality of taps and, connected in parallel therewith, a transient storage element such as a capacitor, and a flywheel diode. The taps are controlled by switches in the form of transistors or thyristors which are turned on and off by a central control unit in response to setting of the speed and, optionally, various feedback devices such as a motor speed detector, an armature EMF detector, or a load current detector. The transient storage device replaces conventional linear impedance or linear power elements in order to prevent loss of power as the armature voltage is increased.

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