Method and apparatus for sensing present position in position co

Details Method and apparatus for sensing present position in position co Method and apparatus for sensing present position in position co

1982-11-17

1985-03-05

Shoop, William M.

Electricity: motive power systems

Positional servo systems

318602, G05B 1928

Patent

active

045033722

ABSTRACT:
A method and apparatus for sensing the present position of a movable machine element in a position control system when a position control loop in the system is placed in the open state. In the position control system, error storage means computes and stores an error which corresponds to the difference between a command value produced by a control unit and an amount of movement sensed by a position sensor provided on a motor shaft or on the movable machine element. A speed control circuit controls the motor in accordance with the error from the error storage means. The method of sensing the present position includes the steps of reading and storing the error from the error storage means as a steady deviation immediately before the position control loop is switched from the closed to the open state, reading the error in the error storage means when the position control loop is in the open state, updating the content of a present position register on the basis of an arithmetic difference obtained by subtracting the steady deviation from the error read from the error storage means when the position control loop is in the open state, and revising the content of the error storage means in dependence upon the arithmetic difference.

REFERENCES:
patent: 4074177 (1978-02-01), Olig

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