Low cost sensorless position detection for brushless DC motor

This paper describes a low cost sensorless position detection scheme for a brushless DC motor. This method is based on interruption of the 3 phase-currents and reading the back-EMF. The hardware for measuring the back-EMF is very simple. The method is possible thanks to the flexibility of the modern DSP. The proposed scheme shows how it is possible to get rotor position information with a good accuracy (5°). This precision allows a sinusoidal alimentation. The method takes information about the rotor in a few microseconds (~100 μs) and when it wants. That means it is robust and does not need to wait a back-EMF zero crossing. The goal of this paper is to prove that sensorless sinusoidal alimentation with a very limited number of components is also possible in a wide speed range. The paper presents the method as well as a wide range of experimental results showing the feasibility and the robustness of the proposed method with 2 different brushless DC motors. The speed range starts at about 1% and stops higher than 100% of the nominal speed

Published in:
8th European Conference on Power Electronics and Applications. EPE'99, Copyright 2001, IEE, 9 pp.
EPE Assoc
Electromech. Lab., Swiss Federal Inst. of Technol., Lausanne, Switzerland
Full papers on CD-ROM in PDF format
brushless DC motor
low-cost sensorless position detection
back-EMF measurement
three-phase currents interruption
rotor position information
sensorless sinusoidal alimentation
position control
control design
control performance
100 mus

 Record created 2006-06-15, last modified 2018-01-27

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