WARF: P140405US01

Flux-Switching Permanent Magnet Machine for High Speed Operation


Bulent Sarlioglu, Yingjie Li

The Wisconsin Alumni Research Foundation (WARF) is seeking commercial partners interested in developing a redesigned FSPM machine that is ideal for high speed applications.
OVERVIEWHigh speed electric machines are needed in many applications including HVAC, industry, flywheels, fans, fuel-efficient vehicles, aircraft and much more.

Flux-switching permanent magnet (FSPM) machines are a promising option because they offer better cooling, simpler rotor construction and reduced reliance on rare earth materials. However, they have difficulty reaching high speeds. This is because current designs require high fundamental frequency to turn the rotor and allow the motor to operate. Such high fundamental frequency may not be attainable with today’s power electronic converters.
THE INVENTIONUW–Madison researchers have developed a new FSPM machine that can be run at high speed with less fundamental frequency required, therefore overcoming one of the largest barriers to adoption. The new design relies on innovative radial flux topology that features an offset rotor structure, dual stators and concentrated coil windings.
  • Compressors, fans, pump motors, traction motors in hybrid and electric vehicles, aerospace motors and generators, and more
  • Ideal for high speed applications (also for medium and low speeds)
  • Achieves up to 60 percent reduction in fundamental frequency
  • Works with traditional inverter drives
STAGE OF DEVELOPMENTThe researchers have conducted modeling and plan further prototyping.
Contact Information
For current licensing status, please contact Michael Carey at or 608-960-9867.
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