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

Author

Zhu, Z.Q. ; Chen, Y.S. ; Howe, D.

Author_Institution

Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

3285

Lastpage

3287

Abstract

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.

Keywords

AC motors; air gaps; brushless machines; losses; machine control; magnetic flux; magnetic variables control; permanent magnet motors; power control; rotors; stators; torque control; airgap flux density distribution; brushless AC motor; constant torque mode; demagnetization withstand capability; flux density loci; flux weakening control; interior magnet topology; interior-mounted magnet rotor; iron loss; maximum power control; maximum torque per ampere; maximum torque per ampere control; permanent-magnet brushless AC machines; stator core; surface-mounted magnet rotor; AC machines; AC motors; Demagnetization; Iron; Magnetic flux; Power control; Rotors; Stator cores; Topology; Torque control;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.802296

Filename

1042526