Direct-Driven Interior Magnet Permanent-Magnet Synchronous Motors for a Full Electric Sports Car

Abstract

The design process of direct-driven permanent magnet synchronous machines (PMSMs) for a full electric 4 ´ 4 sports car is presented. The rotor structure of the machine consists of two permanent magnet layers embedded inside the rotor laminations thus resulting in some inverse saliency, where the q-axis inductance is larger than the d-axis one. An integer slot stator winding was selected to fully take advantage of the additional reluctance torque. The performance characteristics of the designed PMSMs were calculated by applying a twodimensional finite element method. Cross-saturation between the d-and q-axes was taken into account in the calculation of the synchronous inductances. The calculation results are validated by measurements.

Limitations/capabilities of electric machine technologies and modeling approaches for electric motor design and analysis in plug-in electric vehicle applications

“…The cost and the supply of rare-earth material are a problem for PEV mass applications. The development of low-cost, high-temperature magnets would lead to the widespread use of PM machines [20,21]. The machine type is very flexible in construction and can be designed with many pole numbers, different air-gap flux directions such as radial, axial or transversal flux, or with different winding types such as distributed or concentrated windings.…”

“…The IM is one of the main candidates for the PEV powertrain due to its simplicity, low cost, wide speed range, ruggedness, reliability and good dynamic performance . The superior performance of the PM machine, including high efficiency and torque density, small volume, light weight, is the most important reason that it is claimed to be the ideal EM choice [13,[20][21][22]. Although PM machines currently dominate, IMs, the hybrid excited and nonmagnet or less rare-earth magnet EM topologies, such as synchronous reluctance machine (SynRM) [23] and PM assisted SynRM [24], are expected to see a significant increase in their share over the next decade, due to the limitation of resources and fluctuation in the price of the PM materials [25,26].…”

Design and drive-cycle based analysis of direct-driven permanent magnet synchronous machine for a small urban use electric vehicle

“…Similar rotor construction was used by the authors in the traction motors of full electric sports car Electric RaceAbout [14]. The stator winding type was selected to be a two layer integral slot winding.…”

Optimized design of a high-power-density PM-assisted synchronous reluctance machine with ferrite magnets for electric vehicles

“…Many kinds of PMSMs for traction application are actively studied [3][4][5]. PMSM, which use rare-earth PMs have some advantages, such as high torque density, high power density, a high power factor, a wide constant power speed range, and high efficiency, etc.…”