Electrical motor position controller

Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems

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Details

318630, 318599, G05B 1942

Patent

active

050897594

ABSTRACT:
A position controller controls the direction and degrees of rotation of an electrical motor output shaft in response to a stored control program. The stored control program contains a plurality of profiles, each including a plurality of successively executed steps defining the operation sequence of the motor. Each step includes programmed instructions defining a predetermined amount of rotation of the motor output shaft and a predetermined event which must occur before the step is executed. In one embodiment, the controller selectively controls the speed of the motor in each step. The controller supplies a signal, programmed in each step, to a variable frequency A.C. drive which correspondingly varies the frequency of A.C. power supplied to the motor to vary the operating speed of the motor.

REFERENCES:
patent: 4682091 (1987-06-01), Krewalk et al.
patent: 4739240 (1988-04-01), MacMinn et al.
patent: 4851749 (1989-06-01), Forrester
patent: 4962976 (1990-10-01), Takahashi et al.

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