Automatic control system for d-c motor

Details Automatic control system for d-c motor Automatic control system for d-c motor

1980-05-28

1982-07-06

Weldon, Ulysses

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318284, 318286, 318366, H02P 122

Patent

active

043385524

ABSTRACT:
A reversible d-c motor, driving a load such as a vehicular radio antenna, has its armature winding connected in a transistorized energizing circuit which is activated by a start circuit and locks operated as long as the motor speed surpasses a certain threshold, i.e. until a major obstacle or a terminal position is encountered. The threshold may be determined by a voltage sensor detecting the counter-e.m.f. induced in the armature winding, by a Hall-effect device in the magnetic field of the stator, or by a speed sensor. The armature winding lies in series with a current limiter which determines the maximum torque applied to the load and may also transmit a no-load signal to a protective circuit when the motor is found idling, the protective circuit including a timer which cuts off the motor after a predetermined idling period. Alternatively, the operating period may be determined by a pulse counter de-energizing the motor after a preferably settable number of rotor revolutions.

REFERENCES:
patent: 2989678 (1961-06-01), Swartout
patent: 3143696 (1964-08-01), Harris
patent: 3209225 (1965-09-01), Choudhury
patent: 3262041 (1966-07-01), Wickenhagen
patent: 3735224 (1973-05-01), Bachofer et al.
patent: 3980934 (1976-09-01), Wright
patent: 4190841 (1980-02-01), Harada
patent: 4207503 (1980-06-01), Irschik et al.

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