Recently, a new concept of electric variable transmission has been introduced to the power split of hybrid electric vehicles to improve the fuel economy and reduce the emissions. This paper presented an electric variable transmission system which integrated a new two-rotor doubly salient permanent magnet motor. The motor topology, operation principles and electromagnetic performances are investigated. Both theoretical analysis and finite element results show that the proposed motor not only maintains the advantages of doubly salient permanent magnet motors, but also offers flexible operation modes, which makes the motor a promising candidate for speed drive systems especially for hybrid electric vehicles.
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