Design considerations of sinusoidally excited permanent-magnet Machines for low-torque-ripple applications

Several high-performance motor drive applications require the motor drive to produce smooth torque with very stringent torque-ripple requirement. This paper is focused on various machine design considerations that can be used in reducing the torque ripple of a sinusoidally excited permanent-magnet b...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2005-07, Vol.41 (4), p.955-962
Main Authors: Islam, M.S., Mir, S., Sebastian, T., Underwood, S.
Format: Article
Language:English
Subjects:
Brushless DC motors
Computer simulation
Design engineering
Design optimization
Finite element method
Finite element methods
Forging
Harmonics
Iron
Linearity
Machine design
Mathematical models
Motor drives
Motors
permanent-magnet machines
Product design
Ripples
Saturation magnetization
Torque
torque linearity
torque ripple
Voltage
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Summary:Several high-performance motor drive applications require the motor drive to produce smooth torque with very stringent torque-ripple requirement. This paper is focused on various machine design considerations that can be used in reducing the torque ripple of a sinusoidally excited permanent-magnet brushless dc motor. The paper quantifies the various sources of torque ripple, which may be minimized by appropriate design considerations. The paper discusses the factors influencing the harmonic content of the induced voltage, effect of slot/pole combination, winding distribution, and magnetic saturation. Design optimization is directed to minimize cogging torque and the harmonic contents in the back electromotive force, thus reducing the overall torque ripple. Comprehensive finite-element (FE) analysis along with experimental data are provided to validate the theory. The research demonstrates that saturation in the magnetic circuit is another major contributor to the torque ripple and torque nonlinearity as the current increases. A model is developed to study the saturation effect on torque linearity and is verified by FE simulation. Design techniques have been provided to minimize the overall torque ripple and increase the torque linearity.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2005.851026