Method and device for inspecting laminated iron cores of electrical machines for interlamination shorts
First Claim
1. A method for inspecting laminated iron cores of electrical machines for interlamination shorts, in which the laminated iron core is magnetized by means of an auxiliary winding using alternating current, and the iron surface is scanned by means of at least one measurement coil arrangement with a downstream measurement device, wherein as measurement points both the phase and the amplitude of the electrical signal which is induced in the at least one measurement coil arrangement as a function of the position along the stator axis are used in combined form to localize interlamination shorts, wherein interlamination shorts are localized by means of a real part of the induced electrical signal, which is high in comparison to the intact regions, and wherein the high real part is determined by means of a polar representation of the sequence of measurement points, with the real part defining the vector direction and being determined by a calibration measurement.
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Accused Products
Abstract
The present invention relates to a method, an apparatus and a computer program for inspecting laminated iron cores (1) of electrical machines for interlamination shorts, in which the laminated iron core (1) is magnetized by means of an auxiliary winding, and the iron surface is scanned by means of at least one measurement coil arrangement (2) with a downstream measurement device. In this case, unique and quantifiable localization of interlamination shorts is achieved by using both the phase (8) and the amplitude (7) of the electrical signal which is induced in the at least one measurement coil arrangement (2), in combined form.
15 Citations
22 Claims
- 1. A method for inspecting laminated iron cores of electrical machines for interlamination shorts, in which the laminated iron core is magnetized by means of an auxiliary winding using alternating current, and the iron surface is scanned by means of at least one measurement coil arrangement with a downstream measurement device, wherein as measurement points both the phase and the amplitude of the electrical signal which is induced in the at least one measurement coil arrangement as a function of the position along the stator axis are used in combined form to localize interlamination shorts, wherein interlamination shorts are localized by means of a real part of the induced electrical signal, which is high in comparison to the intact regions, and wherein the high real part is determined by means of a polar representation of the sequence of measurement points, with the real part defining the vector direction and being determined by a calibration measurement.
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18. An apparatus for inspecting a laminated iron core of an electrical machine for interlamination shorts, comprising:
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first means for determining a position of a measurement coil arrangement on the laminated iron core along a stator axis of the iron core;
second means for detecting an amplitude and a phase of an electrical voltage which is induced in the measurement coil arrangement; and
a data processing unit, which analyzes the determined position, the detected amplitude, and the detected phase via a polar representation of a sequence of determined position values, detected amplitude values and detected phase values to localize critical interlamination shorts and to determine the volt-amperes flowing in them, by comparison with a reference. - View Dependent Claims (19)
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20. A computer program for causing an apparatus for inspecting a laminated iron core of an electrical machine for interlamination shorts, to perform:
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determining a position of a measurement coil arrangement on the laminated iron core;
detecting an amplitude and a phase of an electrical voltage which is induced in the measurement coil arrangement; and
analyzing the determined position;
the detected amplitude, and the detected phase to localize critical interlamination shorts and determine the volt-amperes flowing in them by comparison with a reference, wherein the detected phase and detected amplitude are changed to a vector representation in the form of a polar diagram.- View Dependent Claims (21, 22)
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Specification