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The use of interior permanent magnet synchronous motors (IPMSMs) with rare-earth magnets has recently been on the rise. When IPMSMs are operated to expand the operating speed range by flux-weakening control, irreversible demagnetization might occur in the magnets in the rotor and deteriorate motor characteristics. To prevent this, dysprosium (Dy) is added to rare-earth magnets. However, it is desirable...
This paper proposes a new design for a spoke-type BLDC motor using a ferrite permanent magnet (Fe-PM) to improve the reliability of the motor. First, the design process for a neodymium permanent magnet free spoke-type BLDC motor without an inserted additional assistant permanent magnet (PM) is presented. The proposed motor is designed by taking into account the demagnetization phenomenon. Second,...
This paper presents the design, performance and control details of traction electric machines for GM's second generation Extended Range Electric Vehicle (EREV). Chevy Volt was the first personal vehicle in the industry with EREV power flow configuration which is carried over to the second generation. Since its introduction in 2011 Chevy Volts have been driven over half a billion miles, 67% of which...
This paper is concerned with the development of a vector controller for a variable flux inset permanent magnet synchronous machine (VF-IPMSM). This variable flux machine (VFM) uses low cost aluminum-nickel-cobalt (AlNiCo) permanent magnets (PMs). The demagnetization of the permanent magnets (PMs) is conducted on the stator winding of the machine hence there is no separate winding for the excitation...
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