Apparatus and method for compensating for warm-up drift in a ser

Details Apparatus and method for compensating for warm-up drift in a ser Apparatus and method for compensating for warm-up drift in a ser

1993-09-15

1995-05-30

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With compensating features

318634, 318635, 318626, G05D 23275

Patent

active

054204909

ABSTRACT:
A register stores the value from the integral controller of the PID controller whenever it receives a feedback signal. A main controller outputs a warm-up drift compensation value whenever the servo motor is at a standstill. An arithmetic unit calculates the sum of the speed command signal from the PID controller, the warm-up drift compensation value from the main controller and a speed feedback signal and applies the result to the servo motor. In order to compensate for the warm-up drift in the servo motor, the main controller controls the position control apparatus by resetting the warm-up drift compensation value as described above.

REFERENCES:
patent: 4533858 (1985-08-01), Tlaker
patent: 4587883 (1986-05-01), Ehrentraut et al.
patent: 4668157 (1987-05-01), Kato et al.
patent: 5119003 (1992-06-01), Lin et al.

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