Electric motor speed and direction controller and method

Details Electric motor speed and direction controller and method Electric motor speed and direction controller and method

1998-10-23

2000-04-18

Nappi, Robert E.

Electricity: motive power systems

Induction motor systems

With commutated winding

318748, H02P 142

Patent

active

060519525

ABSTRACT:
A motor controller for a single phase induction motor (SPIM), wherein the SPIM is driven by two windings, a line winding connected to the ac line and a control winding driven by the controller. The SPIM torque and hence the speed and direction is controlled by the voltage output of the controller for all speeds below the synchronous speed (set by ac line frequency). The controller adjusts the amplitude, the phase angle relative to the line winding, and the frequency of the voltage for the desired SPIM responses. The controller can also selectively switch power to the line winding for a different operating mode with both windings at below synchronous speed. Or, the controller can open the connection to the line winding after starting, and operate the SPIM via the control winding at any speed by adjusting the amplitude and frequency of the controller voltage.

REFERENCES:
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patent: 4099108 (1978-07-01), Okawa et al.
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patent: 4706180 (1987-11-01), Wills
patent: 4926104 (1990-05-01), King et al.
patent: 5252905 (1993-10-01), Wills et al.
"Speed control for Asynchronous Motors" by K. Walters, Feb. 1989, London G.B., vol. 15, No. 164, Elektor Electronics.

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