This paper describes a novel method of estimating the position of a plunger inside a solenoid. The solenoid is a single phase variable reluctance actuator, with a highly nonlinear magnetic circuit. For the proposed method, position is estimated indirectly through the solenoid's incremental inductance in the high current region. It exploits the advantage that motional e.m.f. is negligible under normal operating condition. The incremental inductance is obtained from the rate of current rise of the PWM waveform, which in turn, is measured by a dedicated current rise measurement circuit. Position is estimated from a two dimensional look up table of incremental inductance and current. The method is simulated and then implemented on a typical industrial solenoid valve. Factors which affect the accuracy of the estimation and methods of overcoming them are also described in the paper.
|Number of pages||8|
|Journal||Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)|
|Publication status||Published - 1 Dec 1995|
|Event||Conference Record of the 1995 IEEE Industry Applications 30th IAS Annual Meeting. Part 3 (of 3) - Orlando, FL, United States|
Duration: 8 Oct 1995 → 12 Oct 1995
ASJC Scopus subject areas
- Electrical and Electronic Engineering