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METHOD FOR ADJUSTING THE VALUE OF THE RESISTANCE OF AN ELECTROMAGNET IN A MAGNETIC BEARING AND FOR THE SENSORLESS DETERMINATION OF THE POSITION OF AN OBJECT MOUNTED IN A MAGNETIC BEARING TAKING INTO ACCOUNT THE ADJUSTED VALUE OF THE RESISTANCE
METHOD FOR ADJUSTING THE VALUE OF THE RESISTANCE OF AN ELECTROMAGNET IN A MAGNETIC BEARING AND FOR THE SENSORLESS DETERMINATION OF THE POSITION OF AN OBJECT MOUNTED IN A MAGNETIC BEARING TAKING INTO ACCOUNT THE ADJUSTED VALUE OF THE RESISTANCE
The present invention relates to sensorless position detection for magnetic bearings. Magnetic bearings are generally used to support objects using magnetic fields generated by electromagnets. The position of the object in relation to the bearing is of interest to control the bearing. The object position can be determined by inductance estimation. This inductance estimation is performed by a least squares estimation method, in which case the electrical resistance of the bearing can be considered. Such resistance changes to some extent due to, for example, temperature fluctuations. However, the inaccurate resistance value is reflected in the estimated inductance error (I). Therefore, we propose a method that can be used to adjust the resistance. The inductance error ( ) To 0, so that the electric resistance can be estimated. In this case, the resistance adjustment consists of a low-pass filter and an I-controller.
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