Improved Switching Strategy for a Single-Phase Brushless Direct Current Motor and its Impact on Motor Efficiency

Hannes Grübler, Stefan Leitner, Annette Mütze, Gerhard Schöner

Research output: Contribution to conferencePosterpeer-review


Advancing the turn-off angle of the phase current of brushless direct current (BLDC) motors is a common control practice to improve their behavior and efficiency (reduction of current peaks, copper losses, and breaking torques). This paper investigates a refined switching strategy for a single-phase BLDC motor with bifilar winding to increase the energy conversion efficiency of the system. In addition to advancing the phase current turn-off angle, the turn-on angle is delayed to improve the drive's performance and increase the efficiency even further. The focus is on sub-fractional horsepower single-phase BLDC motors with bifilar winding which, concerning this matter, have not drawn much attention in the literature yet. The findings of the paper show that the improved switching strategy can reduce current peaks, breaking torques, copper losses, and therefore increase efficiency.
Original languageGerman
Publication statusPublished - 2017
Event2017 IEEE International Electric Machines and Drives Conference - Miami, Miami, United States
Duration: 21 May 201724 May 2017


Conference2017 IEEE International Electric Machines and Drives Conference
Abbreviated titleIEMDC
Country/TerritoryUnited States
Internet address


  • BLDC
  • bifilar winding
  • commutation angle
  • efficiency
  • sub-fractional horsepower

Fields of Expertise

  • Mobility & Production

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