Motor voltage controller device

Details Motor voltage controller device Motor voltage controller device

1980-06-05

1982-11-30

Eisenzopf, Reinhard J.

Electricity: motive power systems

Induction motor systems

Power-factor control

318778, 318805, 318812, H02P 124, H02P 528, H02P 736

Patent

active

043617930

ABSTRACT:
A motor voltage control device for single-phase and for three-phase motors, for controlling the voltage supplied to the motor to thereby decrease power when the motor is less than fully loaded. The single-phase device includes a soft start unit and fail detect unit. The three-phase device includes a soft start unit, a fail detect unit, and further provides for controlling motor voltage by allowing modifications to only the positive half cycle of the motor voltage. The three-phase device also continually insures and provides for a path for negative flowing motor currents. The three-phase device also provides for a logic ground for its logic circuitry. The three-phase device may be used with three-phase motors that do not have an easily accessible fourth lead to an internal ground connection.

REFERENCES:
patent: 3332008 (1967-07-01), Mueller et al.
patent: 3441823 (1969-04-01), Schlabach
patent: 3443188 (1969-05-01), Mortimer
patent: 3573580 (1971-04-01), Shinozaki
patent: 3742370 (1973-06-01), Hansen
patent: 4052648 (1977-10-01), Nola
patent: 4207510 (1980-06-01), Woodbury

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