Multilayer Fractional Slot Pole Phase Modulated Induction Motor Drives for Traction Applications

Bhimireddy, Prathap Reddy and K, Siva Kumar (2020) Multilayer Fractional Slot Pole Phase Modulated Induction Motor Drives for Traction Applications. IEEE Transactions on Industrial Electronics, 67 (11). pp. 1-8. ISSN 0278-0046

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Abstract

With the advantage of Pole-phase modulation (PPM) the multiphase induction motor drives facilitate the enriched range of speed-torque characteristics with the higher number of pole-phase combinations. In order to achieve this, higher number of stator slots are required. For a wide range of medium and low power applications, having high number slots may not be possible, because the number of slots decides the volume and weight of the drive. For addressing this slot dependency on the number of pole-phase combinations in PPM, a fractional-slot multilayer winding (FSMLW) is proposed in this paper. For validating the proposed FSMLW concept in this paper a 15-phase winding is designed with 36 slots, which is capable to runs at three different pole-phase combinations, i.e., 1: 3: 5 speed ratios. A carrier phase shifted sinusoidal pulse width modulation is used along with phase grouping concept for improving the harmonic profile of the airgap MMF as well as torque profile. The proposed FSMLW concept has been validated by using Ansys 2-D FEM analysis as well as by performing the experiment on a laboratory prototype on a 36 slot, 5hp 15-phase MIM drive.

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