Circuit for energizing the electromotor driving a blower

Details Circuit for energizing the electromotor driving a blower Circuit for energizing the electromotor driving a blower

1974-07-23

1977-08-23

Dobeck, B.

Electricity: motive power systems

Constant motor current, load and/or torque control

318332, 236 35, 62133, H02P 700

Patent

active

040442870

ABSTRACT:
A constant current source is provided for the energizing circuit of an electromotor driving a blower. The constant current source includes a battery connected in parallel with a series circuit including the energizing circuit of the motor, the emitter-collector circuit of a transistor and a control resistance. The transistor and control resistance are part of the constant current source. The base of the transistor is connected to the output of a differential amplifier the first input of which receives a reference voltage while the second input receives a voltage corresponding to the voltage across the control resistance and thus the energizing current. The reference voltage is derived from a potentiometer connected in parallel with the battery.

REFERENCES:
patent: 2786173 (1957-03-01), Martin et al.
patent: 3366863 (1968-01-01), Riordan et al.
patent: 3396323 (1968-08-01), Auld
patent: 3412305 (1968-11-01), Kanner
patent: 3422331 (1969-01-01), Kearns
patent: 3447056 (1969-05-01), Kosaka et al.
patent: 3518519 (1970-06-01), Callan
patent: 3855511 (1974-12-01), Smith

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