| 摘要 |
The invention relates to a method for the control and regulation of a driving unit for an inductive position sensor intended for the measurement of linear motion and compensation for temperature variations which arise in the sensor, in which a constant alternating current generator AC is used together with a constant direct current generator DC for supply of a circuit including a winding (1) which is part of a position sensor and a current measurement sensor (6) connected in series with the winding, whereby the voltage over the winding is measured both to partly obtain a signal which corresponds to the position of a sensor element (2) which moves relative to the winding and which influences the impedance of the winding, and to partly obtain a signal which corresponds to the temperature of the winding. In order to achieve a temperature compensation which is continuous, an alternating current AC which is superposed onto a direct current DC is used as drive signal for the inductive sensor and this signal is supplied in a current branch of the drive unit (5) which is common for both the winding (1) and the current measurement sensor (6), whereby the differential voltage of the component of the alternating voltage which appears across the winding is measured, and used to form the signal which corresponds to the position of the sensor element (2) relative to the winding (1), and the direct voltage component which appears across the winding is measured and used to form the signal which corresponds to the temperature appearing in the winding. |
