SYNCHRONOUS MACHINE FOR ELECTRIC VEHICLES EQUIPPED WITH EXCITATION WINDING POWERED BY ROTARY TRANSFORMER
DOI:
https://doi.org/10.36801/Keywords:
SYNCHRONOUS MACHINE, ROTARY TRANSFORMER, FINITE ELEMENT METHOD (FEM), ELECTRIC VEHICLESAbstract
Most of the drives currently used in Electric Vehicles (EVs) use asynchronous motors or synchronous motors with permanent magnets. Although highly efficient in a wide range of rotational speeds, classic electric synchronous machines have often been avoided due to the transmission of excitation current through collector rings and brushes that have a limited service life, variable contact resistance, and generate electromagnetic disturbances and pollution with conductive particles. Lately, the high cost of high-performance permanent magnets and reliance on a single supplier have now brought back the use of the classic synchronous motor in its virtually maintenance-free version, achieved by non-contact transmission of excitation current. The paper analyzes the use for this purpose of a Rotary Transformer (TR) with magnetic circuit made of standard ferrite. The TR parameters are identified and studied by the Finite Element Method (MEF), some of the results being verified experimentally.
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