CA2463590A1 - Method and device for inspecting laminated iron cores of electrical machines for interlamination shorts - Google Patents

Method and device for inspecting laminated iron cores of electrical machines for interlamination shorts Download PDF

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Publication number
CA2463590A1
CA2463590A1 CA002463590A CA2463590A CA2463590A1 CA 2463590 A1 CA2463590 A1 CA 2463590A1 CA 002463590 A CA002463590 A CA 002463590A CA 2463590 A CA2463590 A CA 2463590A CA 2463590 A1 CA2463590 A1 CA 2463590A1
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CA
Canada
Prior art keywords
coil arrangement
interlamination
measurement coil
laminated iron
induced
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002463590A
Other languages
French (fr)
Other versions
CA2463590C (en
Inventor
Ingo Kirchhoff
Zlatimir Posedel
Eric Nodwell
Max Hobelsberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Technology GmbH
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Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2463590A1 publication Critical patent/CA2463590A1/en
Application granted granted Critical
Publication of CA2463590C publication Critical patent/CA2463590C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

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  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biochemistry (AREA)
  • Immunology (AREA)
  • Electrochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

The invention relates to a method, a device and a computer program for controlling laminated steel sheet stacks (1) of electrical machines in a vie w to detect steel sheet short-circuits. According to said method, the laminate d steel sheet stack (1) is magnetised by means of an auxiliary winding and the steel surface is scanned by means of at least one measuring coil arrangement (2) with a downstream measuring device. It is thus possible to localise stee l sheet short-circuits in a unique and quantifiable manner since the phase (8) and the amplitude (7) of the electrical signal induced in the at least one measuring coil arrangement (2) are used in a combined form.

Claims (11)

1. A method 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, characterized in that both the phase (8) and the amplitude (7) of the electrical signal which is induced in the at least one measurement coil arrangement (2) are used in combined form to localize interlamination shorts.
2. The method as claimed in claim 1, characterized in that interlamination shorts are localized by means of a real part (10) of the induced electrical signal, which is high in comparison to the intact regions.
3. The method as claimed in claim 2, characterized in that the high real part is determined by means of a polar representation, with the real part (10) defining the vector direction and being determined by the calibration measurement.
4. The method as claimed in one of the preceding claims, characterized in that at least one further measurement coil arrangement, which is electrically isolated from a first measurement coil arrangement (2) is used, and is radially at a distance but is mechanically connected to the first measurement coil arrangement, and both the phase (8) and the amplitude (7) of the at least two electrical signals, which are induced in the at least two measurement coil arrangements (2), are used to localize interlamination shorts, in particular to localize them in the radial~
direction.
5. The method as claimed in one of the preceding claims, characterized in that the induced electrical signals are compared with signals which correspond to the interlamination short currents, with a calibration current coil (9) with an appropriate width being mounted on the surface of the laminated iron core (1) as a reference for this purpose, and being fed with an appropriate interlamination short current.
6. The method as claimed in claim 5, characterized in that the volt-amperes in an interlamination short are determined quantitatively by comparison with the reference.
7. The method as claimed in one of the preceding claims, characterized in that the laminated iron core (1) is magnetized in particular via the rotor shaft from a high-power supply source which is connected between the two machine sides, in particular on the insulated shaft, in particular with the laminated iron core (1) being magnetized in the range from 0.03 to 0.7 Tesla, in particular approximately 0.1 Tesla, with a voltage of 220/110 volts at 50/60 Hz.
8. The method as claimed in one of the preceding claims, characterized in that the at least one measurement coil arrangement (2) is shifted on the laminated iron core (1) in the axial direction, and, in the process, the induced signals are determined, in particular in the form of a fingerprint, as a function of the position of the measurement coil arrangement (2), with regions with critical interlamination shorts being determined, in particular, via the real part (10) and being distinguished from regions with noncritical interlamination shorts, and with the critical regions being marked for immediate rectification, and the regions which are still noncritical at that time being documented for later analysis.
9. An apparatus for carrying out a method as claimed in one of claims 1 to 8, comprising first means for determining the position of the measurement coil arrangement (2) on the laminated iron core (1), and comprising second means for detecting the amplitude (7) and the phase (8), in particular by means of a phase detector, of the electrical voltage which is induced in the measurement coil arrangement (2), and also comprising a data processing unit, which analyzes the measured data and, in particular, is able to localize critical interlamination shorts and to determine the volt-amperes flowing in them, by comparison with a reference.
10. A computer program for carrying out the analysis in a data processing unit as claimed in claim 9, characterized in that the data, that is to say the phase (8) and amplitude (7) of the electrical current which is induced in the measurement coil arrangement (2), is changed to a vector representation in the form of a polar diagram, preferably after having been adjusted using a reference, and fault points (a) are identified automatically.
11. The computer program as claimed in claim 10, characterized in that fault points (a) are determined by the real part (10) of the signal exceeding a predetermined limit value.
CA2463590A 2001-09-24 2002-09-23 Method and device for inspecting laminated iron cores of electrical machines for interlamination shorts Expired - Lifetime CA2463590C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US32406101P 2001-09-24 2001-09-24
US60/324,061 2001-09-24
CH5862002 2002-04-05
CH0586/02 2002-04-05
PCT/IB2002/003914 WO2003036287A1 (en) 2001-09-24 2002-09-23 Method and device for controlling laminated steel sheet stacks of electrical machines in a view to detect steel sheet short-circuits

Publications (2)

Publication Number Publication Date
CA2463590A1 true CA2463590A1 (en) 2003-05-01
CA2463590C CA2463590C (en) 2010-11-30

Family

ID=25737655

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2463590A Expired - Lifetime CA2463590C (en) 2001-09-24 2002-09-23 Method and device for inspecting laminated iron cores of electrical machines for interlamination shorts

Country Status (6)

Country Link
EP (1) EP1430297B1 (en)
CA (1) CA2463590C (en)
DE (1) DE50207214D1 (en)
ES (1) ES2266633T3 (en)
PT (1) PT1430297E (en)
WO (1) WO2003036287A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH699666A1 (en) * 2008-10-08 2010-04-15 Alstom Technology Ltd Method and device for the detection of short circuits in the stator laminated core of electric machines.
EP2942633A1 (en) * 2014-05-06 2015-11-11 Siemens Aktiengesellschaft Method and device for detecting winding short circuits and electric machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2324003A1 (en) * 1975-09-09 1977-04-08 Commissariat Energie Atomique NON DESTRUCTIVE EDD CURRENT CONTROL PROCESS AND CORRESPONDING DEVICE, USING MULTI-FREQUENCY EXCITATION AND ALLOWING THE ELIMINATION OF CERTAIN PARAMETERS
GB2044936B (en) * 1978-05-31 1983-01-06 Central Electr Generat Board Method of and apparatus for testing laminated magnetic cores
DE3213267A1 (en) * 1982-04-08 1983-10-20 Nukem Gmbh, 6450 Hanau METHOD AND DEVICE FOR TESTING MATERIALS ACCORDING TO THE FLUID FLOW PRINCIPLE
DE3542159A1 (en) * 1985-11-28 1987-06-04 Nukem Gmbh METHOD FOR TESTING MATERIALS UNDER THE FLUID FLOW PRINCIPLE AND DEVICE FOR IMPLEMENTING THE METHOD
CH676526A5 (en) * 1988-05-30 1991-01-31 Asea Brown Boveri
US5895439A (en) * 1996-10-15 1999-04-20 Southwest Research Institute Method for generating and displaying complex data derived from non-destructive evaluation scanning

Also Published As

Publication number Publication date
DE50207214D1 (en) 2006-07-27
EP1430297B1 (en) 2006-06-14
PT1430297E (en) 2006-11-30
ES2266633T3 (en) 2007-03-01
CA2463590C (en) 2010-11-30
EP1430297A1 (en) 2004-06-23
WO2003036287A1 (en) 2003-05-01

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Effective date: 20220923