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 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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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.
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Citations
25 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.
- 16. A control apparatus for controlling a rotating synchronous electric machine, characterized in that the electric machine is cooled by at least one coolant, wherein the temperature of the coolant is measured, and the electric machine comprises at least stator current, stator voltage, rotor current, and coolant temperature signal inputs, and that the control apparatus is arranged to transmit control signals for controlling at least one variable in the electric machine in dependence on the signals on the signal inputs and using a model of the electric machine, which model is used to estimate the temperature in at least two positions in the electric machine.
- 17. An apparatus for monitoring a rotating synchronous electric machine, characterized in that the electric machine is cooled by at least one coolant, wherein the temperature of the coolant is measured, and the electric machine comprises at least stator current, stator voltage, rotor current, and coolant temperature signal inputs and that the control apparatus is adapted to estimate the temperature in at least two positions in the electric machine in dependence on the signals on the signal inputs and using a model of the electric machine.
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24. A memory medium on which a computer program is stored for controlling 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, characterized in that the computer program when executed on a computer causes the computer to
receive an input signal containing stator winding current data, receive an input signal containing stator winding voltage data, receive an input signal containing rotor winding current data, receive an input signal containing coolant temperature data, and estimate the temperature in at least two positions in the electric machine using a theoretical model of the electric machine and the data of the received input signals.
Specification