A Sensorless Commutation Strategy for a Brushless DC Motor Drive System Based on Detection of Back Electromagnetic Force

Tsotoulidis S., Safacas A., Mitronikas E.

International Aegean Conference on Electrical Machines and Power Electronics / Electromotion Joint Conference, İstanbul, Turkey, 8 - 10 September 2011, pp.32-37 identifier

  • Publication Type: Conference Paper / Full Text
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.32-37


In this paper a sensorless commutation strategy for a brushless de motor without using any analog filters or integrators is proposed. This technique is based on the estimation of the hack-EMF of the non-conducting phase using the three terminal voltages of the machine with respect to the half of the DC voltage. A constant phase shift of 30 is achieved, independently front the operating point of the motor. The performance of the system using this strategy is assessed by simulation in MATLAB/SIMULINK software. Two operating scenarios are investigated at different rotor speeds in order to prove wide operation range of the proposed strategy.