Universal series motor with speed limiting circuit to protect th

Details Universal series motor with speed limiting circuit to protect th Universal series motor with speed limiting circuit to protect th

1990-05-23

1991-05-14

Shoop, Jr., William M.

Electricity: motive power systems

Series motors

Control by motor circuit impedance

318251, 388806, 388822, 388905, 361 33, 361 56, H02K 2300

Patent

active

050159283

ABSTRACT:
A shunt element and a voltage detection circuit are connected in parallel across the armature of a universal series motor. At relatively light loads on the motor, the armature speed increases, thereby increasing the back e.m.f. of the armature. The voltage detection circuit causes the shunt element to conduct, and a shunt current flows through the field of the motor, thereby increasing the field and limiting the speed of the motor. Various embodiments are disclosed.

REFERENCES:
patent: 3187246 (1965-06-01), Garten
patent: 3221234 (1965-11-01), Ault
patent: 3590352 (1971-06-01), Ries
patent: 3904931 (1975-09-01), Leidich
patent: 4023071 (1977-05-01), Fussell
patent: 4086983 (1978-05-01), Anzai et al.
patent: 4131832 (1978-12-01), Cavil et al.
patent: 4151450 (1979-04-01), Fukuma et al.
patent: 4213077 (1980-07-01), Hernung et al.
patent: 4594632 (1986-06-01), Unnewehr
patent: 4943887 (1990-07-01), Bose

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