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

Claim 4:
5. 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;
comparing the intensity of the measured current passing through the stator coil to an activation threshold, and comparing the time derivative of the estimated electric resistance to an inactivation threshold, and wherein, if the intensity of the measured current is below the activation threshold or the time derivative of the estimated electric resistance is above the inactivation threshold, the method comprises assigning the last value of the estimated resistance to the estimated resistance when the intensity of the measured current is above the activation threshold and the time derivative of the estimated electric resistance is below the inactivation threshold.