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

Research output: Contribution to journalArticle

47 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 languageEnglish
Article number5464380
Pages (from-to)1397-1405
Number of pages9
JournalIEEE Transactions on Industry Applications
Volume46
Issue number4
DOIs
Publication statusPublished - 2010 Jul 1

Fingerprint

Synchronous motors
Permanent magnets
Demagnetization
Magnets
Monitoring
Saturation magnetization
Degradation

Keywords

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

ASJC Scopus subject areas

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

Cite this

Automated monitoring of magnet quality for permanent-magnet synchronous motors at standstill. / Hong, Jongman; Hyun, Doosoo; Lee, Sang Bin; Yoo, Ji Yoon; Lee, Kwang Woon.

In: IEEE Transactions on Industry Applications, Vol. 46, No. 4, 5464380, 01.07.2010, p. 1397-1405.

Research output: Contribution to journalArticle

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