Method for adjusting resistance of electromagnet in magnetic bearing and for sensorless determination of position of object mounted in magnetic bearing, taking into account adjusted value of resistance

摘要

For an object on a bearing mounting having a magnetic bearing providing a magnetic field generally produced by an electromagnet, the bearing is regulated based on a position of the object relative to the bearing. The position of the object is determined by reference to an estimate of the inductance obtained using a least squares method, in which the electrical resistance of the bearing is taken into account. The resistance is subject to variations, for example due to temperature fluctuations; however, the electrical resistance can be estimated by regulating the inductance error, Δ{circumflex over (L)}={circumflex over (L)}_2,s^LS−{circumflex over (L)}_1,s^LS down to zero, where the resistance adjustment facility may be a low-pass filter and an integration controller.