Circuit arrangement for controlling starting current of a motor

Details Circuit arrangement for controlling starting current of a motor Circuit arrangement for controlling starting current of a motor

1986-06-20

1987-07-21

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318779, 318798, 318806, H02P 126

Patent

active

046820957

ABSTRACT:
In a motor control apparatus arranged to drive a motor by rectifying a.c. voltage and smoothing a rectified voltage by a capacitor, a voltage across the capacitor is detected to see if the voltage is below a reference voltage or not by a first comparator (24), and if so, an output voltage (V) is produced. This output voltage (V) is used to change another reference voltage of another comparator (21) used for detecting if current to the motor (5) or a motor drive circuit (4) is greater than the reference. When the current is larger than the reference, the comparator (21) produces a low level output causing a control circuit (23) to control the drive circuit (4) to reduce the current to motor (5).

REFERENCES:
patent: 3603856 (1971-09-01), Zalar et al.
patent: 3947748 (1976-03-01), Klein
patent: 4270078 (1981-05-01), Walker et al.
patent: 4309751 (1982-01-01), Okado

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