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Comparative analytical and experimental study of fabricated identical surface and interior permanent magnet BLDC motor prototypes

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Abstract

This paper presents a novel and exhaustive investigation involving in-depth analysis, performance evaluation and comparative study of two 0.75 hp, 4-pole, 1500 rpm laboratory prototypes of Brushless DC (BLDC) motors of identical nominal ratings with surface and interior permanent magnet rotor structures having the same stator and winding (integral slot distributed winding). Both the motors were designed and developed in the lab. The major electrical variables (such as rated power, speed, voltage, current, number of poles, etc.) and the stator (such as core material, stator lamination, stack length, winding pattern and wire gauge) of the fabricated prototypes have also been kept identical to pin-point the direct influence of the two different rotor configurations (viz., surface vs interior permanent magnet) on the parameters, performance and operation of these BLDC motors. Additionally, to ensure unbiased basis for appropriate comparison, the overall volumes of magnets/pole in both the motors have also been kept similar. A detailed comparison of different quantities like air-gap flux density distribution, THD in induced voltage, torque ripple, losses and efficiency, torque–speed characteristics with field-weakening capability, steady state parameters at different operating conditions, etc. has been conducted for the said motors and the salient points duly highlighted. The vulnerability of the permanent magnets to demagnetisation based on armature reaction, particularly during a sudden fault, has also been investigated in both the cases. The theoretically determined parameters and analytically evaluated performance figures have been verified through standard FEM packages, and later validated experimentally on the fabricated prototypes. Very good mutual agreement has been observed between predicted and experimental values.

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Acknowledgements

The authors wish to thank the staff of M/s GE motors Pvt. Ltd, Sheorapuli, WB, and Mr. Kausik Pyne, in particular, for the fabrication support received. The authors also acknowledge the funds received from CSIR, GoI (for manpower support) and Nampet-II, MeitY, GoI (for fabrication support), and the support received from the research colleagues at the Advanced Power Electronics Laboratory, Department of Electrical Engineering, IIEST, Shibpur, towards this work. The co-operation of the authorities at the IIEST, Shibpur, is also thankfully acknowledged.

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Authors and Affiliations

  1. Department of Electrical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, 711103, India

    Pinaki Mukherjee, Sourabh Paitandi & Mainak Sengupta

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  1. Pinaki Mukherjee
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  2. Sourabh Paitandi
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  3. Mainak Sengupta
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Correspondence to Pinaki Mukherjee.

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Mukherjee, P., Paitandi, S. & Sengupta, M. Comparative analytical and experimental study of fabricated identical surface and interior permanent magnet BLDC motor prototypes. Sādhanā 45, 26 (2020). https://doi.org/10.1007/s12046-019-1264-0

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