Control device for stopping the operation of a single-phase asyn

Details Control device for stopping the operation of a single-phase asyn Control device for stopping the operation of a single-phase asyn

1997-01-27

1998-06-02

Masih, Karen

Electricity: motive power systems

Induction motor systems

Primary circuit control

318364, 318430, 318434, 318138, 318439, 318254, H02P 142

Patent

active

057605661

ABSTRACT:
The invention relates to a control device for stopping the operation of a single-phase asynchronous motor with a capacitor in the event an overload of this motor with respect to a threshold value is detected. This device is characterized in that it includes, on the one hand, device for measuring the phase shift between any one parameter, voltage or current (U1, U2, I2, I3) of the main phase (.phi.1) or the secondary phase (.phi.2) and another one of these parameters and, on the other hand, device for controlling the stoppage capable of interrupting the current supply to the motor in the event there is measured a time delay lower than a memorized threshold value.

REFERENCES:
patent: 3584282 (1971-06-01), Reeves et al.
patent: 3644810 (1972-02-01), Lewus
patent: 4210948 (1980-07-01), Waltz
patent: 4796142 (1989-01-01), Libert
patent: 4967131 (1990-10-01), Kim
patent: 4999556 (1991-03-01), Masters
patent: 5151638 (1992-09-01), Beckerman
patent: 5153489 (1992-10-01), Unsworth et al.

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