A hybrid observer for high performance brushless DC motor drives
- Univ. of Missouri, Rolla, MO (United States). Dept. of Electrical Engineering
Brushless DC drive systems are used in a wide variety of applications. These drives may be classified as being one of two types; sinusoidal drives in which there are no low-frequency harmonics in the current waveforms and no low-frequency torque ripple and non-sinusoidal drives in which there is considerable low-frequency harmonic content, both in the current and torque waveforms. Although the sinusoidal drives feature superior performance, they are generally more expensive since rotor position must be sensed on a continuous basis, thus requiring an optical encoder or a resolver, whereas relatively inexpensive Hall-effect sensors may be used for non-sinusoidal drives. In this paper, a straightforward hybrid observer is set forth which enables rotor position to be estimated on a continuous basis using information available from the Hall-effect sensors. The proposed observer is experimentally shown to perform just as well as an optical encoder for steady-state conditions and nearly as well as the optical encoder during transient conditions. The proposed scheme provides designers with a new option for rotor position sensing, one which offers an excellent compromise between accuracy and expense.
- OSTI ID:
- 276817
- Report Number(s):
- CONF-960111-; ISSN 0885-8969; TRN: IM9636%%492
- Journal Information:
- IEEE Transactions on Energy Conversion, Vol. 11, Issue 2; Conference: IEEE Power Engineering Society (PES) Winter meeting, Baltimore, MD (United States), 21-25 Jan 1996; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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