Optimized Structure of Axial Flux Permanent Magnet Motors used as Submarines' Propulsion in Order to Reduce Torque Ripple

Document Type : Original Article

Abstract

Today, the permanent magnet motors are widely used in various industries especially military applications due
to such characteristics as high efficiency, low weight and high energy dens ity. Torque ripple is an inherent
characteristic of this type  of motors. Time and space harmonics produced by the motor drive and the motor
structure itself give rise to torque ri pples in these motors. Geometric structure of the magnets and stator slots
lead to cogging torque (one of the ca uses of torque ripple) in these motors. This unwanted torque component
causes noise, vibration and motor starting issues. It also creates bubbles in the application of these motors as
the submarines' propulsion. It shoul d be noted that bubbles could lead  to submarine detection which is
undesirable in military application. This paper provides analytical formulations  and validation by three-
dimensional finite element analysis to redu ce this unwanted torque. This is  an important step in achieving the
goals of the country's marine industries organization. 

Keywords

References

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History

  • Receive Date: 02 May 2016
  • Revise Date: 06 March 2019
  • Accept Date: 19 September 2018

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