Position encoder interface for a servo control system

Details Position encoder interface for a servo control system Position encoder interface for a servo control system

1979-03-12

1981-04-28

Truhe, J. V.

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

318570, 318607, 318608, 318601, 318603, G05B 1924

Patent

active

042648505

ABSTRACT:
An encoder interface circuit is responsive to command direction signals and pulsed command incremental rotation signals and to actual direction signals and pulsed actual incremental rotation signals to generate an error signal to a motor driver for controlling the movement of a servo motor. A position encoder is mechanically coupled to the servo motor for generating the actual direction and incremental rotation signals. The interface circuit generates a reference pulse train and an error pulse train, both at a relatively high frequency. The error pulse train is phase modulated by adding or subtracting the pulsed actual and command incremental signals according to the state of the corresponding direction signals. The reference and phase modulated error pulse trains are then compared to generate the error signal to the motor driver.

REFERENCES:
patent: 3349229 (1967-10-01), Evans
patent: 3532955 (1970-10-01), Henegar
patent: 3571686 (1971-03-01), Henegar
patent: 3836756 (1974-09-01), Yammoto et al.
patent: 3878983 (1975-04-01), Hamill et al.

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