Control system

Details Control system Control system

1976-10-26

1979-06-19

Rubinson, Gene Z.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, 318640, 318313, G05B 1940

Patent

active

041588002

ABSTRACT:
Improved drive logic for a stepper motor is provided using a closed loop feedback system which includes a coded disk driven by the motor and decoding means to derive signals from said disk. The motor is operated at varying speeds in accordance with variations in the lead angle between the energized motor windings and the motor shaft position. Motor drive signals are generated in response to the sensing of leading or trailing edge pulses from the coded disk, and the lead angle, and thus the speed of the motor, may be increased or decreased by selectively shifting the control of the drive signals from a pulse leading edge to a pulse trailing edge or vice versa, thereby providing a change in the lead angle. In addition, pulses from the coded disk may be blanked in order to effect a decrease in motor speed.

REFERENCES:
patent: 3736488 (1973-05-01), Abraham et al.
patent: 3843917 (1974-10-01), Hoffman
patent: 3863118 (1975-01-01), Lander et al.
patent: 3869656 (1975-03-01), Kennedy et al.
patent: 3946298 (1976-03-01), VAN DE Loo

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