Influence of Silicone Contamination on Brush-Commutator Contacts in Small-Size DC Motors

Akira Okada, Minoru Toda

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The influence of silicones on the brush-commutator contact in direct current (dc) motors was investigated. The surfaces of silicone-contaminated brushes and commutators were observed by a scanning electron microscope (SEM). The surfaces also were analyzed semiquantitativevly by means of Auger electron spectroscopy (AES). The results suggest that frictionally polymerized silicones at the (Ag-Pd catalytic) metal surface form insulative layers on both the commutator and the brush surfaces. Such contamination causes contact phenomena that impede motor startup at low voltages. Small quantities of variously located silicone can also contaminate commutator and brush surfaces even during room temperature storage.

Original languageEnglish
Pages (from-to)281-286
Number of pages6
JournalIEEE Transactions on Components, Hybrids, and Manufacturing Technology
Issue number2
Publication statusPublished - Jun 1982
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Engineering(all)
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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