Brushless DC motor 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 nonsinusoidal drives in which there is considerable low-frequency harmonic content, both in the current and torque waveforms. Although 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 nonsinusoidal 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.
K. Corzine and S. D. Sudhoff, "A Hybrid Observer for High Performance Brushless DC Motor Drives," IEEE Transactions on Energy Conversion, Institute of Electrical and Electronics Engineers (IEEE), Jan 1996.
The definitive version is available at http://dx.doi.org/10.1109/60.507184
Electrical and Computer Engineering
Keywords and Phrases
DC Motor Drives; Hall Effect Devices; Hall-Effect Sensors; Brushless DC Motor Drive Systems; Brushless DC Motors; Current Waveforms; Electric Sensing Devices; Hybrid Observer; Low-Frequency Harmonics; Machine Testing; Observers; Performance; Position Measurement; Rotor Position Measurement; Rotors; Steady-State Conditions; Transient Conditions
International Standard Serial Number (ISSN)
Article - Journal
© 1996 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.