In order to choose electric machines for transport applications, i.e. automotive, aerospace, railway and naval, a tool that can make quick tradeolfs of high specific torque electric motors has been developed. The level of the different technologies involved in an electrical machine can be quantifi ed using the loadability concepts developed by experienced designers. After recalling these concepts, magnetic, electric and thermaJ balances are used to calculate the main sizes of an electric motor according to some targets. Specific power or specifi c torque can then be quickly assessed. The proposed approach is validated by applying the tool to some known high torque industrial motors.
In the past, designers develop analytical models that are useful to size rapidly surface mounted permanent magnet synchronous motor with sinusoidal waves and a high specific power. In order to ensure the assumptions of sinusoidal waves, a joint design of the stator winding and the rotor is presented. First, an Halbach permanent magnet array is optimized to obtain the desired airgap magnetic flux density wave. Then, in order to obtain a surface current density wave consistent with the desired wave, the conductor distribution along the stator bore is determined.
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