Positioning control device for an electric motor

Electricity: motive power systems – Positional servo systems – With compensating features

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Details

318611, 318758, 318369, G05D 23275

Patent

active

046510737

ABSTRACT:
A rotational position, velocity and acceleration of an electrical motor are detected and an amount of overrun produced when the motor has stopped is estimated from the detected velocity and acceleration, and at least one of motor position detection data and a positioning target value is changed in accordance with the estimated amount of overrun. The position detection data and the positioning target value after the change are compared with each other and a command for stopping the motor is generated in accordance with a result of this comparison. A brake is applied to the motor in advance by the amount of the estimated overrun so that the motor is stopped at a desired target position after making overrun. Further, velocity setting signals are generated in accordance with desired acceleration and deceleration characteristics and the velocity control of the motor is effected in an open loop in response to the velocity setting signals. By the stop and velocity controls of an open loop system, positioning control of the motor of the open loop system can be accurately performed.

REFERENCES:
patent: 3555254 (1971-01-01), Gerber
patent: 3906315 (1974-01-01), Gotisar
patent: 3917930 (1975-11-01), Davey
patent: 4139811 (1979-02-01), Klinger
patent: 4451769 (1984-05-01), Minnich et al.
patent: 4486692 (1984-12-01), Sonada et al.
patent: 4499546 (1985-02-01), Kuga et al.
patent: 4558265 (1985-12-01), Hayashida et al.

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