Patent ID: 11962258
Assignee: SKF MAGNETIC MECHATRONICS
Field: Mechanical elements (Mechanical engineering)
Classification: CPC H  F  G | IPC H

Claim 5:
6. A method for estimating the temperature of a stator coil of a magnetic suspension bearing of a rotor and which is connected by connection wires to circuits for servo-controlling the position of the rotor, comprising:
measuring the electric voltage at the terminals of the connection wires of the stator coil;
measuring the intensity of the current passing through the stator coil;
estimating the electric resistance of the stator coil and of the connection wires based on an adaptive filter, the measured electric voltage, and the intensity of the measured current and estimating the temperature of the coil based on the value of the estimated resistance
estimating the temperature of the coil on the basis of the value of the estimated resistance comprises computing the estimated temperature on the basis of Matthiessen's rule connecting the estimated temperature to the estimate of the electric resistance, to a value of the electric resistance of the material of the coil at a reference temperature and to a characteristic temperature of the material of the coil at which the material has zero resistance at a pressure of 1 bar.