Multiple mode variable speed motor control circuit

Details Multiple mode variable speed motor control circuit Multiple mode variable speed motor control circuit

1974-03-20

1976-06-08

Dobeck, B.

Electricity: motive power systems

Motor-reversing

Field circuit control

318345, H02P 516

Patent

active

039626156

ABSTRACT:
A multiple mode variable speed motor control circuit is provided having a master control switch for applying a source of AC potential to the circuit. A diode rectifies the source for applying a DC potential across a string of resistors from which a control voltage is selected by a plurality of push button switches having a common output which is connected to a motor control circuit including a silicon controlled rectifier (SCR). The SCR is coupled to and operates a motor in the conventional phase-control manner. A memory in the form of a capacitor is coupled to the input of the motor control circuit in one position of the master control switch, allowing the push button to be activated momentarily, with the memory maintaining the speed of the motor at the selected rate. In another position of the master control switch the push button corresponding to the motor speed selected must be continually actuated for running the motor at the selected speed. A timer circuit may also be provided which acts to de-activate the memory after a predetermined time interval to automatically stop the motor.

REFERENCES:
patent: 3293521 (1966-12-01), Vroonhoven
patent: 3422330 (1969-01-01), Swanke
patent: 3436634 (1969-04-01), Baldwin et al.
patent: 3638091 (1972-01-01), Hosokawa et al.
patent: 3641410 (1972-02-01), Vogelsberg
patent: 3670226 (1972-06-01), Mazza
patent: 3815001 (1974-06-01), Jamieson
patent: 3833845 (1974-09-01), Smallbone et al.

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