Method for controllably positioning a solenoid plunge

Details Method for controllably positioning a solenoid plunge Method for controllably positioning a solenoid plunge

G - Physics

05

D

341/97

G05D 7/06 (2006.01) G05D 3/18 (2006.01)

Patent

CA 1331045

ABSTRACT OF THE DISCLOSURE An improved method for controllably positioning the plunger of a solenoid apparatus at a target position between its two extreme positions. The plunger is spring biased to a retracted position, and an electrical coil is intermittently pulsed to drive the plunger against the spring bias toward an extended position, such that the plunger oscillates about the target position. A precise, stable control of the plunger's oscillating motion about the target position is achieved by continuously measuring the plunger's actual position, in real time, based on a series of measurements of electrical current conducted through the electrical coil when it is being pulsed.

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