Drive control circuit for sensorless type three-phase half-wave

Details Drive control circuit for sensorless type three-phase half-wave Drive control circuit for sensorless type three-phase half-wave

1991-01-23

1992-04-07

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Braking

318756, 318739, H02P 318

Patent

active

051031523

ABSTRACT:
A level detector outputs signals every time voltages induced by the U-phase, V-phase and W-phase motor coils exceed a predetermined level. When the signals are output in a predetermined order from the level detector, U-phase, V-phase and W-phase commutation circuits supply control signals to U-phase, V-phase and W-phase drive current output circuits, respectively. When the signal outputting order is reversed to the predetermined order, the commutation circuits output no control signals. Upon reception of the control signals from the U-phase, V-phase and W-phase commutation circuits, the U-phase, V-phase and W-phase drive current output circuits supply the currents to the respective motor coils. When at three-phase half-wave motor is rotating in the forward direction, therefore, the currents will be sequentially supplied to the motor coils from the associated drive current output circuits for the individual phases. When the motor rotates in the reverse direction, no currents will be supplied to the motor coils, thus stopping the motor.

REFERENCES:
patent: 3262041 (1966-07-01), Wickenhagen
patent: 3649894 (1972-03-01), Yoneya
patent: 4169990 (1979-10-01), Ierdman
patent: 4600872 (1986-07-01), Shepard, Jr.
patent: 4862052 (1989-08-01), Unsworth et al.
patent: 4922169 (1990-05-01), Freeman

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