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Low Cost Sensorless Position Detection for Brushless DC Motor
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| Author(s) |
F. Bonvin; Y. Perriard |
| Abstract |
This paper describes a low cost sensorless position detection for 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 a 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 (~100Us) and when it wants. That minds 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 componentsis also possible in a big speed range. The paper presents the method as well as a wide range 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. |
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| Filename: | EPE1999 - PP00092 - Bonvin.pdf |
| Filesize: | 163.7 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-04-07 by System |
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