A4 Conference proceedings

Comparison of Halbach Rotors with Other PM Structures

Publication Details
Authors: Lindh Pia, Petrov Ilya, Pyrhönen Juha, Santa-Nokki Timo
Publication year: 2019
Language: English
Title of parent publication: 2019 IEEE International Electric Machines & Drives Conference (IEMDC)
ISBN: 978-1-5386-9351-3
eISBN: 978-1-5386-9350-6
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication


Different options of placing permanent magnets into a rotor are studied in a case of a permanent magnet synchronous motor. Rotors with permanent magnets in Halbach structures are compared with more conventional rotors in a 100 kW traction motor application. A rotor-surface-magnet motor is compared with four distinct interior magnet and Halbach rotor designs. One design is a full Halbach rotor, in which the whole rotor is structured from segmented magnets polarized in several directions. As a result, no iron core in the rotor is needed. Surface magnet Halbach and embedded partial Halbach structures are also introduced. The advantages and disadvantages of applying Halbach structures and especially interior magnets in a permanent magnet motor are investigated in detail. It is shown that the partial Halbach type with slightly embedded magnets can improve the maximum available torque without a considerable increase in material consumption.

Last updated on 2020-20-03 at 10:03