Device for controlling AC motor

Details Device for controlling AC motor Device for controlling AC motor

1989-02-21

1990-10-02

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Braking

318741, H02P 318

Patent

active

049610422

ABSTRACT:
A device for controlling an AC motor for a fork lift truck comprises a detector to detect direction of rotation of an AC motor. The direction of rotation thus detected is compared with a desired direction of rotation of the AC motor, and the AC motor is controlled such that the AC motor operates in a power running mode when the actual direction of rotation of the AC motor is equal to the desired direction of rotation of the AC motor, but it operates in regenerative braking mode when said actual direction of rotation of the AC motor fails to be equal to the desired direction of rotation of the AC motor. The desired direction of rotation of the AC motor may be set manually by an operator or a driver of a vehicle drien by the AC motor.

REFERENCES:
patent: 3365638 (1968-01-01), Risberg
patent: 3720863 (1973-03-01), Ringland et al.
patent: 3731169 (1973-05-01), Burgholte et al.
patent: 3848165 (1974-11-01), Heiberger
patent: 4262241 (1981-04-01), Azusawa
patent: 4316132 (1982-02-01), Geppert
patent: 4544868 (1985-10-01), Murty
patent: 4554805 (1985-11-01), Hirooka et al.
patent: 4618810 (1986-10-01), Hagerman et al.

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