Automated monitoring of magnet quality for permanent-magnet synchronous motors at standstill

Jongman Hong; Doosoo Hyun; Sang Bin Lee; Ji Yoon Yoo; Kwang Woon Lee

doi:10.1109/TIA.2010.2049811

Automated monitoring of magnet quality for permanent-magnet synchronous motors at standstill

Jongman Hong^*
, Doosoo Hyun
, Sang Bin Lee
, Ji Yoon Yoo
, Kwang Woon Lee

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

109 Citations (Scopus)

Abstract

Demagnetization of permanent magnets (PMs) used in synchronous motors can occur due to a combination of thermal, electrical, and/or environmental operating stresses. Since PM demagnetization results in degradation of motor performance, efficiency, and reliability, it is important to monitor the quality of PMs regularly. However, there are many limitations to the offline and online methods currently used for magnet quality assessment. In this paper, a new inverter-embedded technique for automated monitoring of magnet quality for permanent-magnet synchronous motors (PMSMs), which overcomes the limitations of existing techniques, is proposed. The main concept is to use the inverter to perform a standstill test whenever the motor is stopped to detect local or uniform PM demagnetization. The machine is excited with a pulsating field at different angular positions, and the change in the current peaks caused by the change in the degree of magnetic saturation due to demagnetization is observed. An experimental study on a 10-hp PMSM verifies that local and uniform PM demagnetizations can be detected with high sensitivity.

Original language	English
Article number	5464380
Pages (from-to)	1397-1405
Number of pages	9
Journal	IEEE Transactions on Industry Applications
Volume	46
Issue number	4
DOIs	https://doi.org/10.1109/TIA.2010.2049811
Publication status	Published - 2010 Jul

Bibliographical note

Funding Information:
Manuscript received October 13, 2009; revised January 16, 2010; accepted January 19, 2010. Date of publication May 17, 2010; date of current version July 21, 2010. Paper 2009-EMC-342.R1, presented at the 2009 IEEE Energy Conversion Congress and Exposition, San Jose, CA, September 20–24, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICA-TIONS by the Electric Machines Committee of the IEEE Industry Applications Society. This work was supported by the Korea Research Foundation Grant funded by the Korean Government (KRF-2008-331-D00200).

Keywords

AC machine
NdFeB magnet
condition monitoring
demagnetization
diagnostics
inverter
offline testing
permanent magnet (PM)
pulsating magnetic field
synchronous motor

ASJC Scopus subject areas

Control and Systems Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

Access to Document

10.1109/TIA.2010.2049811

Cite this

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title = "Automated monitoring of magnet quality for permanent-magnet synchronous motors at standstill",

abstract = "Demagnetization of permanent magnets (PMs) used in synchronous motors can occur due to a combination of thermal, electrical, and/or environmental operating stresses. Since PM demagnetization results in degradation of motor performance, efficiency, and reliability, it is important to monitor the quality of PMs regularly. However, there are many limitations to the offline and online methods currently used for magnet quality assessment. In this paper, a new inverter-embedded technique for automated monitoring of magnet quality for permanent-magnet synchronous motors (PMSMs), which overcomes the limitations of existing techniques, is proposed. The main concept is to use the inverter to perform a standstill test whenever the motor is stopped to detect local or uniform PM demagnetization. The machine is excited with a pulsating field at different angular positions, and the change in the current peaks caused by the change in the degree of magnetic saturation due to demagnetization is observed. An experimental study on a 10-hp PMSM verifies that local and uniform PM demagnetizations can be detected with high sensitivity.",

keywords = "AC machine, NdFeB magnet, condition monitoring, demagnetization, diagnostics, inverter, offline testing, permanent magnet (PM), pulsating magnetic field, synchronous motor",

author = "Jongman Hong and Doosoo Hyun and Lee, \{Sang Bin\} and Yoo, \{Ji Yoon\} and Lee, \{Kwang Woon\}",

note = "Funding Information: Manuscript received October 13, 2009; revised January 16, 2010; accepted January 19, 2010. Date of publication May 17, 2010; date of current version July 21, 2010. Paper 2009-EMC-342.R1, presented at the 2009 IEEE Energy Conversion Congress and Exposition, San Jose, CA, September 20–24, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICA-TIONS by the Electric Machines Committee of the IEEE Industry Applications Society. This work was supported by the Korea Research Foundation Grant funded by the Korean Government (KRF-2008-331-D00200).",

year = "2010",

month = jul,

doi = "10.1109/TIA.2010.2049811",

language = "English",

volume = "46",

pages = "1397--1405",

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issn = "0093-9994",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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AU - Hong, Jongman

AU - Hyun, Doosoo

AU - Lee, Sang Bin

AU - Yoo, Ji Yoon

AU - Lee, Kwang Woon

N1 - Funding Information: Manuscript received October 13, 2009; revised January 16, 2010; accepted January 19, 2010. Date of publication May 17, 2010; date of current version July 21, 2010. Paper 2009-EMC-342.R1, presented at the 2009 IEEE Energy Conversion Congress and Exposition, San Jose, CA, September 20–24, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICA-TIONS by the Electric Machines Committee of the IEEE Industry Applications Society. This work was supported by the Korea Research Foundation Grant funded by the Korean Government (KRF-2008-331-D00200).

PY - 2010/7

Y1 - 2010/7

N2 - Demagnetization of permanent magnets (PMs) used in synchronous motors can occur due to a combination of thermal, electrical, and/or environmental operating stresses. Since PM demagnetization results in degradation of motor performance, efficiency, and reliability, it is important to monitor the quality of PMs regularly. However, there are many limitations to the offline and online methods currently used for magnet quality assessment. In this paper, a new inverter-embedded technique for automated monitoring of magnet quality for permanent-magnet synchronous motors (PMSMs), which overcomes the limitations of existing techniques, is proposed. The main concept is to use the inverter to perform a standstill test whenever the motor is stopped to detect local or uniform PM demagnetization. The machine is excited with a pulsating field at different angular positions, and the change in the current peaks caused by the change in the degree of magnetic saturation due to demagnetization is observed. An experimental study on a 10-hp PMSM verifies that local and uniform PM demagnetizations can be detected with high sensitivity.

AB - Demagnetization of permanent magnets (PMs) used in synchronous motors can occur due to a combination of thermal, electrical, and/or environmental operating stresses. Since PM demagnetization results in degradation of motor performance, efficiency, and reliability, it is important to monitor the quality of PMs regularly. However, there are many limitations to the offline and online methods currently used for magnet quality assessment. In this paper, a new inverter-embedded technique for automated monitoring of magnet quality for permanent-magnet synchronous motors (PMSMs), which overcomes the limitations of existing techniques, is proposed. The main concept is to use the inverter to perform a standstill test whenever the motor is stopped to detect local or uniform PM demagnetization. The machine is excited with a pulsating field at different angular positions, and the change in the current peaks caused by the change in the degree of magnetic saturation due to demagnetization is observed. An experimental study on a 10-hp PMSM verifies that local and uniform PM demagnetizations can be detected with high sensitivity.

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Automated monitoring of magnet quality for permanent-magnet synchronous motors at standstill

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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