Variable-reluctance servocontrolled linear motor

Details Variable-reluctance servocontrolled linear motor Variable-reluctance servocontrolled linear motor

1992-11-25

1997-04-15

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318653, 318135, 318159, G05B 1100

Patent

active

056212933

ABSTRACT:
The variable-reluctance servocontrolled linear motor comprises an electromagnet formed by a shell and by a winding around a displacement path, a magnetic portion mobile in the direction of displacement, guided mechanically so as to have a single degree of freedom with respect to the shell, under the effect of the force exerted by the electromagnet. A detector circuit is formed by an inductive or capacitive measurement sensor for the instantaneous value of the air gap and delivers a signal sd representative of the displacement of the mobile magnetic portion. A subtracter circuit receives a displacement control signal e and the signal sd representative of the displacement in order to deliver a displacement error signal .epsilon. for the mobile magnetic portion. A current amplifier circuit receives the error signal .epsilon. and delivers a supply current to the winding. A restoring element for the mobile magnetic portion exerts on the latter a restoring force opposed to the force exerted by the electromagnet. The restoring element can be mechanical or constituted by a counter-electromagnet.

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