Tri-state switching controller for reciprocating linear motors

Details Tri-state switching controller for reciprocating linear motors Tri-state switching controller for reciprocating linear motors

1987-07-17

1988-09-20

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318135, 310 27, G05B 1100

Patent

active

047728388

ABSTRACT:
A nonlinear control system adapted to drive and control the speed, stroke, phase and center position of a reciprocating linear motor by means of phase locked loop techniques and the electromechanical filtering properties of linear motors. The control system comprises a tri-state switching amplifier in conjunction with 3 distinct feedback control loops to accurately determine the amplitude, center position and phase of the motor. The first feedback control loop includes a low pass averaging circuit and compares the motor position with a reference signal to achieve the desired motor position. The second feedback control loop includes a peak detector and determines the stroke of the reciprocating motor. The third feedback control loop operates as a phase locked loop to control the phase of the motor. The control system provides high efficiency, high reliability and low cost.

REFERENCES:
patent: 4381478 (1983-04-01), Sano et al.
patent: 4461984 (1984-07-01), Whitaker et al.

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