| 摘要 |
<p>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.</p> |
