Speed control with low armature loss for very small sensorless brushed DC motors

Jonathan Scott, John McLeish, W. Howell Round

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)
369 Downloads (Pure)


A method for speed control of brushed dc motors is presented. It is particularly applicable to motors with armatures of less than 1 cm3. Motors with very small armatures are difficult to control using the usual pulsewidth-modulation (PWM) approach and are apt to overheat if so driven. The technique regulates speed via the back electromotive force but does not require current-discontinuous drives. Armature heating in small motors under PWM drive is explained and quantified. The method is verified through simulation and measurement. Control is improved, and armature losses are minimized. The method can expect to find application in miniature mechatronic equipment.
Original languageEnglish
Pages (from-to)1223-1229
Number of pages7
JournalIEEE Transactions on Industrial Electronics
Issue number4
Publication statusPublished - 2009

Bibliographical note

Copyright 2009 IEEE. Reprinted from IEEE transactions on industrial electronics, Volume 56, Issue 4, 1223-1229. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Macquarie University’s products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.


  • DC motor drives
  • micromotors
  • permanent magnet (PM) motors
  • pulsewidth modulation (PWM)
  • rotating machine stability
  • variable-speed drives


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