System for controlling rotational direction switchover and for v

Details System for controlling rotational direction switchover and for v System for controlling rotational direction switchover and for v

1979-11-15

1981-10-13

Miller, J. D.

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318 55, 318293, 318313, 318336, H02P 506

Patent

active

042950805

ABSTRACT:
A system for controlling rotational direction switchover and for variably controlling the rotational speed of a motor comprises a circuit for switching over the rotational direction of the motor, a circuit for supplying rotation driving voltage to the motor thereby to drive it at a speed depending on the rotation driving voltage, a single voltage varying unit for varying voltage continuously, and a control signal generation circuit which receives variable voltage from the voltage varying means to generate a rotational control signal for the rotation driving voltage supplying circuit and further to generate a rotational direction switchover control signal for the switchover circuit. The voltage of the rotation control signal produced by the control signal generation circuit decreasing as the variable voltage approaches a predetermined value, reaching a minimum when the variable voltage coincides with the predetermined voltage, and increasing as the variable voltage goes beyond the predetermined value. The rotational direction switchover control signal is produced by the control signal generation circuit when the variable voltage is substantially the predetermined value.

REFERENCES:
patent: 3050672 (1962-08-01), Alexanderson
patent: 3119957 (1964-01-01), Alexanderson
patent: 3181096 (1965-04-01), Sutton
patent: 3487279 (1959-12-01), Stringer et al.
patent: 3684945 (1972-08-01), Hermansson et al.

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