JPS54127509A - Abnormality detector of rotor winding - Google Patents

Abnormality detector of rotor winding

Info

Publication number
JPS54127509A
JPS54127509A JP3482278A JP3482278A JPS54127509A JP S54127509 A JPS54127509 A JP S54127509A JP 3482278 A JP3482278 A JP 3482278A JP 3482278 A JP3482278 A JP 3482278A JP S54127509 A JPS54127509 A JP S54127509A
Authority
JP
Japan
Prior art keywords
voltage
current
motor
rotor
detector
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.)
Pending
Application number
JP3482278A
Other languages
Japanese (ja)
Inventor
Ryoichi Nagashima
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP3482278A priority Critical patent/JPS54127509A/en
Publication of JPS54127509A publication Critical patent/JPS54127509A/en
Pending legal-status Critical Current

Links

Landscapes

  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

PURPOSE: To provide the subject detector wherein cracks and cavities in bars and end rings of the rotor of a squirrel-cage induction motor can be detected with high precesion from the variation of a primary current.
CONSTITUTION: A constant-voltage three-phase source 1 is connected to a motor 2 to be tested, and any one phase line current is passed through a current transformer 3 and guided to an ammeter 4 and a detector 5. A voltage (one severalth of the motor rated voltage) in such a degree as can slowly rotating the rotor motor 2 to be tested is supplied from the constant-voltage three-phase source 1. When there is found any abnormality in the rotor, the pointer of the ammeter 4 is vibrated little by little at a certain indicated position. In this case, a current waveform as shown by reference numeral 9 appears in the current detector 5. The ripple components of the current waveform 9 are pulled out by a ripple separator 6, and amplified by an amplifier 7, and whether good or had is discrimiated by the voltage level in a level discriminator 8.
COPYRIGHT: (C)1979,JPO&Japio
JP3482278A 1978-03-28 1978-03-28 Abnormality detector of rotor winding Pending JPS54127509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3482278A JPS54127509A (en) 1978-03-28 1978-03-28 Abnormality detector of rotor winding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3482278A JPS54127509A (en) 1978-03-28 1978-03-28 Abnormality detector of rotor winding

Publications (1)

Publication Number Publication Date
JPS54127509A true JPS54127509A (en) 1979-10-03

Family

ID=12424881

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3482278A Pending JPS54127509A (en) 1978-03-28 1978-03-28 Abnormality detector of rotor winding

Country Status (1)

Country Link
JP (1) JPS54127509A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4978909A (en) * 1988-11-14 1990-12-18 Martin Marietta Energy Systems, Inc. Demodulation circuit for AC motor current spectral analysis
EP0461327A2 (en) * 1990-06-01 1991-12-18 Justo Roman Guerra Electric motor rotor tester

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4978909A (en) * 1988-11-14 1990-12-18 Martin Marietta Energy Systems, Inc. Demodulation circuit for AC motor current spectral analysis
EP0461327A2 (en) * 1990-06-01 1991-12-18 Justo Roman Guerra Electric motor rotor tester

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