Cogging Torque Reduction by Increasing Tooth Tang Radius in Radial Flux Permanent Magnet Brushless DC Motor

International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue IX, September 2018 | ISSN 2321–2705

Cogging Torque Reduction by Increasing Tooth Tang Radius in Radial Flux Permanent Magnet Brushless DC Motor

Amit Kapil1, Nil Patel2

1Dept. of. Electrical Engineering, Nirma University, Ahmedabad, Gujarat, India
2Dept. of. Electrical Engineering, Ganpat University, Mehsana, Gujarat, India

Abstract – Permanent Magnet Brushless DC (PMBLDC) motors are arises as a suitable motor for a number of drive applications in industrial and consumer products. Cogging torque is one of the main downside of PMBLDC motor which results in noises and shaft vibrations. The focus of this work is to reduce the cogging torque in PMBLDC by implementing reconstruction in design parameters. For analyzing the performance of the machine, machine is modeled using Finite Element Analysis (FEA) based software package Motor solve. It is observed that the cogging torque is influenced by tooth tang radius variation. Hence, it is very essential to select proper stator tooth tang radius to reduce the cogging torque in order to improve the performance.

Keywords— cogging torque; finite element analysis (FEA); motor solve; permanent magnet motor; tooth tang radius

I. INTRODUCTION

Permanent Magnet Brushless DC (PMBLDC) motors have advantages such as high efficiency, high power density and high reliability. These motors required minimum maintenance because of the absence of a mechanical commutator. Cogging torque is prime creator of torque ripple and it is one of the most important disadvantage of PMBLDC motor which results vibrations in shaft and noise. Cogging torque is due to the design outlook of the machine and it is created due to interaction between rotor magnet and stator teeth. There are different techniques are used to reduce cogging torque. In design improvement researchers have suggested various design modifications to reduce the cogging torque. The focus of this work is to minimize cogging torque in PMBLDC by introducing design modifications. The performance of the machine is analyzed by varying the magnet pole shape, magnet pole width and by using magnetic material with different remanance value. For analyzing the performance of the machine, machine is modeled using Finite Element Analysis (FEA) based software package Motor solve.The focus of this work is to minimize cogging torque in BLDC by increasing tooth tang radius.

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