Electromagnetic design and analysis of a salient-pole synchronous machine with tooth-coil windings for use as a wheel hub motor in an electric vehicle

Jürgens, Jonathan; Brune, A.; Ponick, Bernd

doi:10.1109/icelmach.2014.6960264

Cited by 18 publications

(2 citation statements)

References 5 publications

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“…Wound Rotor Synchronous Machines (WRSMs) are widely used with a great efficiency and reliability for high power level electrical generation, see Figure 1. WRSMs own several advantages: a low cost, a wide field weakening region at high speed, and a significant improvement of the safety (this is due to the possibility to cancel the field current, which limits the risks of high voltages for high speed mode [1][2][3][4][5][6], and this corresponds to the requirements of HVAC applications). Nevertheless, the rotor windings cause Joule losses, and the heat is hard to evacuate.…”

Section: Introductionmentioning

confidence: 99%

Optimization, 3D-Numerical Validations and Preliminary Experimental Tests of a Wound Rotor Synchronous Machine

et al. 2021

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In this paper, a complete methodology to design a modular brushless wound rotor synchronous machine is proposed. From a schedule of conditions and a chosen structure (with 7 phases, 7 slots and 6 poles), a non-linear and non-convex optimization problem is defined and solved using NOMAD (a derivative free local optimization code): the external volume is minimized under some constraints, which are the average torque equal to 5 Nm, the torque ripple less than 5%, the efficiency greater than 94%, and the surface temperature less than 85 °C. The constraints have to be computed using 2D-finite element simulations in order to reduce the CPU-time consumption for each NOMAD iteration. Moreover, a relaxation of this optimization problem makes it possible to provide an efficient starting point for NOMAD. Thus, a good optimal design is obtained, and it is then validated by using 3D electromagnetic and thermic numerical methods. These numerical verifications show that, inside the end-winding, the leakage flux is high. This yields a lot of iron losses in this machine. Moreover, the surface and coil temperature differences between the 2D and 3D numerical approaches are discussed. Finally, the machine prototype is built following the optimal dimensions and a POKI-POKITM assembly technology. Preliminary experimental tests are carried out, and the results are devoted to the comparison of measured and predicted 3D numerical results.

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Section: Introductionmentioning

confidence: 99%

Optimization, 3D-Numerical Validations and Preliminary Experimental Tests of a Wound Rotor Synchronous Machine

et al. 2021

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“…The numerical simulation permits to accurately evaluate the average torque, the cogging torque, and the power factor. The main goal of this paper is to design high‐performance multiphase WRSMs with non‐overlapping fractional‐slot concentrated winding that can be used to replace PMSM in HVAC applications [5–7].…”

Section: Introductionmentioning

confidence: 99%