Electric machine
AssigneeSydkraft AB
InventorsHakan Swahn, Bertil Svensson
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Abstract
A method and an apparatus are described for monitoring a rotating synchronous electric machine (9), which comprises a rotor having 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.
Claims35
A method of monitoring a rotating synchronous electric machine (9), which comprises a rotor having a rotor winding and a stator having a stator winding, the method comprising 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 theoretical model of the electric machine and the determined current and voltage values.
A method according to any one of the preceding claims, wherein the rotor according to the model is divided into zones in the axial direction of the machine and wherein the temperature is estimated for each zone.
A method according to any one of the preceding claims, wherein the rotor according to the model is divided into zones in the radial direction of the machine and wherein the temperature is estimated for each zone.
A method according to any one of the preceding claims, wherein the stator according to the model is divided into zones in the axial direction of the machine and wherein the temperature is estimated for each zone.
A method according to any one of the preceding claims, wherein the stator according to the model is divided into zones in the radial direction of the machine and wherein the temperature is estimated for each zone.
A method of controlling at least one variable in a rotating synchronous electric machine (9), which comprises a rotor having a rotor winding and a stator having a stator winding, the method comprising 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 theoretical model of the electric machine and in dependence on the determined current and voltage values, and
- controlling said at least one variable in dependence on the estimated temperatures and using the model of the electric machine.
A control apparatus for controlling a rotating synchronous electric machine, characterized in that it comprises at least stator current and stator voltage 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.
An apparatus for monitoring a rotating synchronous electric machine, characterized in that it comprises at least stator current and stator voltage 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.
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, 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, and
- estimate the temperature in at least two positions in the electric machine using a theoretical model of the electric machine.
Dependencies are inferred from the claim text.