Method and device for detecting interlaminar short circuits
First Claim
1. A method for determining a short circuit between at least two stator laminates in an electrical machine having a rotor mounted on a shaft and a stator, the method comprising:
- rotating the rotor on the shaft relative to the stator so as to pass a magnetic stator flux, varying over time, through the stator;
determining, during the rotation, a measurement variable sensitive to a short-circuit current caused by the magnetic stator flux between the at least two stator laminates;
determining the magnetic stator flux;
providing a theoretical model describing a relationship between the magnetic stator flux and the measurement value or an auxiliary variable derived from the measurement value; and
comparing the measurement variable or the auxiliary variable with the theoretical model.
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Accused Products
Abstract
A method for determining a short circuit between at least two stator laminates in an electrical machine having a rotor mounted on a shaft and a stator, includes rotating the rotor on the shaft relative to the stator so to pass a magnetic stator flux, varying over time, through the stator, determining, during the rotation, a measurement variable sensitive to a short-circuit current caused by the magnetic stator flux between the at least two stator laminates, and determining the magnetic stator flux. In addition, a theoretical model is provided describing a relationship between the magnetic stator flux and the measurement value or an auxiliary variable derived from the measurement value, and the measurement variable or the auxiliary variable is compared with the theoretical model. A device for carrying out a method for determining a short circuit is also provided.
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Citations
20 Claims
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1. A method for determining a short circuit between at least two stator laminates in an electrical machine having a rotor mounted on a shaft and a stator, the method comprising:
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rotating the rotor on the shaft relative to the stator so as to pass a magnetic stator flux, varying over time, through the stator; determining, during the rotation, a measurement variable sensitive to a short-circuit current caused by the magnetic stator flux between the at least two stator laminates; determining the magnetic stator flux; providing a theoretical model describing a relationship between the magnetic stator flux and the measurement value or an auxiliary variable derived from the measurement value; and comparing the measurement variable or the auxiliary variable with the theoretical model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device for determining a short circuit between at least two stator laminates in an electrical machine having a rotor rotating on a shaft and a stator, a magnetic stator flux varying over time passing through the stator, the device comprising:
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a measurement arrangement configured to determine a measurement variable sensitive to a short-circuit current caused by the magnetic stator flux between at least two stator laminates; a unit configured to determine the magnetic stator flux; an evaluation unit configured to compare the measurement variable or an auxiliary variable derived therefrom with a theoretical model for the relationship between the measurement variable or the auxiliary variable and the magnetic stator flux. - View Dependent Claims (17, 18, 19, 20)
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Specification