Article
Article
- Engineering & Materials
- Electrical engineering
- Permanent-magnet synchronous machines
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Permanent-magnet synchronous machines
Article By:
Aziz Rahman, M. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, Newfoundland, Canada.
Last reviewed:2011
DOI:https://doi.org/10.1036/1097-8542.YB110105
- Magnet placement
- IPM motor design
- Applications of PM synchronous generators
- IPM synchronous motor applications and performance
- Related Primary Literature
- Additional Reading
Tremendous advances in the development of permanent-magnet synchronous machines have taken place over the past two decades, particularly in high-efficiency interior-permanent-magnet (IPM) motors and associated drive technology. A close examination reveals that different technological advancements and market forces have combined, sometimes in fortuitous ways, to accelerate the development of permanent-magnet synchronous machines. In a conventional synchronous machine, an electromagnet is produced by direct current passing through windings placed on the rotor of the machine. In permanent-magnet (PM) machines, the electromagnet is replaced by modern hard permanent magnets with good magnetic properties, such as neodymium boron iron (NdBFe). The PM synchronous machines are available as both PM generators and PM motors. Because of their use in modern line-start as well as soft-start inverter-fed ac (alternating-current) motor drives in intensive energy-consuming devices such as air conditioners and electric and hybrid-electric vehicles, as well as heavy-duty-cycle ventilation fans and pumps, IPM synchronous motors can readily benefit an energy-hungry world.
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