Electric machine
First Claim
1. A method of monitoring a rotating synchronous electric machine, which comprises a rotor having a rotor winding and a stator having a stator winding, wherein the electric machine is cooled by at least one coolant, the method comprising the steps ofdetermining the stator winding current,determining the stator winding voltage,determining the rotor winding current,measuring the coolant temperature, andestimating the temperature in at least two positions in the electric machine using a theoretical model of the electric machine, the determined current and voltage values, and the measured temperature of the coolant.
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Accused Products
Abstract
A method and an apparatus are described for monitoring a rotating synchronous electric machine (9), which comprises a rotor winding and a stator having a stator winding. The method comprises the steps of determining the stator winding current, determining the stator winding voltage, determining the rotor winding current, and estimating the temperature in at least two positions in the electric machine (9) using a model of the electric machine and the determined current and voltage values. An apparatus according to the invention is provided for carrying out the method.
26 Citations
15 Claims
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1. A method of monitoring a rotating synchronous electric machine, which comprises a rotor having a rotor winding and a stator having a stator winding, wherein the electric machine is cooled by at least one coolant, the method comprising the steps of
determining the stator winding current, determining the stator winding voltage, determining the rotor winding current, measuring the coolant temperature, and estimating the temperature in at least two positions in the electric machine using a theoretical model of the electric machine, the determined current and voltage values, and the measured temperature of the coolant.
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4. A method of controlling at least one variable in a rotating synchronous electric machine, which comprises a rotor having a rotor winding and a stator having a stator winding, and the electric machine is cooled by at least one coolant, the method comprising the steps of
determining the stator winding current, determining the stator winding voltage, determining the rotor winding current, measuring the temperature of the coolant, and estimating the temperature in at least two positions in the electric machine using a theoretical model of the electric machine and in dependence on the determined current and voltage values and the measured coolant temperature, and controlling said at least one variable in dependence on the estimated temperatures and using the model of the electric machine.
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