METHOD AND DEVICE FOR DETECTING SHORT-CIRCUITS IN THE STATOR CORE OF ELECTRIC MACHINES
First Claim
1. :
- A method for detecting turn-to turn faults in a laminate stack of a stator of an electrical machine or a generator, the method comprising;
magnetizing the stator using an auxiliary coil and an auxiliary current so as to form a magnetic field;
measuring the magnetic field using a pickup device including at least two detectors disposed in at least two respective different radial positions with respect to a rotor axis so as to provide at least two signals corresponding to the magnetic field at the respective at least two different radial positions;
evaluating and comparing at least one of a magnitude and a phase angle of the at least two signals so as to determine at least one of a relative magnitude and relative phase angle by subtraction so as to detect turn-to-turn faults; and
recording relative differences in the at least two signals.
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Accused Products
Abstract
A method for detecting turn-to turn faults in a laminate stack of a stator of an electrical machine or a generator includes magnetizing the stator using an auxiliary coil and an auxiliary current so as to form a magnetic field. The magnetic field is measured using a pickup device including at least two detectors disposed in at least two respective different radial positions with respect to a rotor axis so as to provide at least two signals corresponding to the magnetic field at the respective radial positions. The method includes evaluating and comparing a magnitude and/or a phase angle of the signals so as to determine a relative magnitude and/or relative phase angle by subtraction in order to detect turn-to-turn faults. Relative differences in the at least two signals are recorded. Also a device for performing the method.
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Citations
19 Claims
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1. :
- A method for detecting turn-to turn faults in a laminate stack of a stator of an electrical machine or a generator, the method comprising;
magnetizing the stator using an auxiliary coil and an auxiliary current so as to form a magnetic field; measuring the magnetic field using a pickup device including at least two detectors disposed in at least two respective different radial positions with respect to a rotor axis so as to provide at least two signals corresponding to the magnetic field at the respective at least two different radial positions; evaluating and comparing at least one of a magnitude and a phase angle of the at least two signals so as to determine at least one of a relative magnitude and relative phase angle by subtraction so as to detect turn-to-turn faults; and recording relative differences in the at least two signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- A method for detecting turn-to turn faults in a laminate stack of a stator of an electrical machine or a generator, the method comprising;
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14. :
- A device for detecting turn-to turn faults in a laminate stack of a stator of an electrical machine or a generator, the device comprising;
a pickup device including at least two detectors, the at least two detectors being disposed in at least two respective radial positions with respect to a rotor axis and being configured to simultaneously measure a magnetic field at the at least two radial positions so as to generate at least two respective signals; and an evaluation unit configured to detect turn-to-turn faults by at least one of evaluating and comparing at least one of a magnitude and a phase angle of the at least two signals so as to determine at least one of a relative magnitude and a relative phase angle of the at least two signals by subtraction. - View Dependent Claims (15, 16, 17, 18, 19)
- A device for detecting turn-to turn faults in a laminate stack of a stator of an electrical machine or a generator, the device comprising;
Specification