Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-09-10
2000-07-11
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
318607, 324236, H02K 3310
Patent
active
06087743&
ABSTRACT:
A positioning system adapted for use with micromechanical actuators provides feedback control of the position of the movable element of the actuator utilizing a low Q sensing coil. The effective inductance of the sensing coil changes with position of the movable element to change the frequency of oscillation of a variable oscillator. The output of the variable oscillator is compared in a phase detector to a reference oscillator signal. The phase detector provides a pulsed output having a pulse duty cycle related to the phase or frequency difference between the oscillator signals. The output of the phase detector is provided to a drive coil which applies a magnetic force to the movable element which balances the force of a spring. The movable element can be displaced to a new position by changing the frequency of the reference oscillator.
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Guckel Henry
Stiers Eric W.
Jones Judson H.
Ramirez Nestor
Wisconsin Alumni Research Foundation
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