Electricity: motive power systems – Alternating current commutating motors – Universal or a.c.-d.c. motors
Patent
1978-08-24
1980-07-15
Truhe, J. V.
Electricity: motive power systems
Alternating current commutating motors
Universal or a.c.-d.c. motors
318250, 318316, 318244, 318512, H02K 2300
Patent
active
042130778
ABSTRACT:
A transformer having a secondary winding that delivers a regulating magnitude to a speed regulator circuit that approaches zero as the speed approaches the speed setting, is provided with two primary windings wound and connected so that they oppose each other in operation. The first is the conventional primary winding in series with the universal motor of which the speed is being controlled (as by a conduction phase angle control of the input voltage) while the second primary winding is in series with a resistance and, in some cases, also with a capacitor, with this series combination being connected in parallel with the armature winding of the motor for the best regulation, or in parallel with the motor as a whole if it is important to avoid additional internal connections to the motor. The capacitor is used to compensate for the inductive reactance of the second primary winding in cases in which that reactance is not negligible. A second capacitor across the secondary filters out commution "hash."
REFERENCES:
patent: 3295035 (1966-12-01), Field
patent: 3541413 (1970-11-01), Conrad
patent: 4002959 (1977-01-01), Schadlich
Gerschner Martin
Hornung Friedrich
Redman John W.
Robert & Bosch GmbH
Truhe J. V.
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