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Iron loss in permanent-magnet brushless AC machines under maximum torque per ampere and flux weakening control

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3 Author(s)
Z. Q. Zhu ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK ; Y. S. Chen ; D. Howe

The airgap flux density distribution, flux density loci in the stator core, and the associated iron loss in two topologies of brushless AC motor, having a surface-mounted magnet rotor and an interior-mounted magnet rotor, respectively, are investigated when operated under maximum torque per ampere control in the constant torque mode and maximum power control in the flux-weakening mode. It is shown that whilst the interior magnet topology is known to be eminently suitable for flux-weakening operation, due to its high demagnetization withstand capability, its iron loss can be significantly higher than for a surface-mounted magnet machine.

Published in:

IEEE Transactions on Magnetics  (Volume:38 ,  Issue: 5 )