Assessment of torque components in brushless permanent magnet machines through numerical analysis of the electromagnetic field

For the calculation of torque in brushless (BL) AC motors a local method is proposed, based on the Maxwell stress theory and the filtered contributions due to the harmonics of the magnetic vector potential in the motor air-gap. By considering the space fundamental field only, the method can efficien...

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Bibliographic Details
Main Authors: Ionel, D.M., Popescu, M., McGilp, M., Miller, T.J.E., Dellinger, S.
Format: Conference Proceeding
Language:English
Subjects:
A.c. Machines
AC motors
Applied sciences
Electrical engineering. Electrical power engineering
Electrical machines
Electromagnetic fields
Exact sciences and technology
Filtering theory
Magnetic separation
Miscellaneous
Numerical analysis
Permanent magnet machines
Power harmonic filters
Stress
Synchronous motors
Torque
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Description
Summary:For the calculation of torque in brushless (BL) AC motors a local method is proposed, based on the Maxwell stress theory and the filtered contributions due to the harmonics of the magnetic vector potential in the motor air-gap. By considering the space fundamental field only, the method can efficiently estimate the average synchronous torque for a variety or motor topologies, including concentrated winding designs. For BLDC motor analysis a global method is introduced, based on the virtual work principle expressed in terms of energy components in various motor regions. The method leads to simplifications in the average torque calculation and enables the direct identification of the cogging and ripple components. The mathematical procedures have been validated against experiments and other numerical techniques.
ISSN:0197-2618
2576-702X
DOI:10.1109/IAS.2004.1348702