Rotor slot optimization of squirrel cage induction motor

Alessandro Marfoli, Mauro Di Nardo, Michele Degano, Chris Gerada

Research output: Contribution to conferencePaperpeer-review


On-line squirrel cage induction motors are still widely adopted in many industrial applications that require reliability and robustness. The absence of the power electronics simplifies the drive's structure with a consequent reduction of the failure probability. On the other hand, the motor's design needs to satisfy the requirements of starting capability in term of minimum torque and maximum current allowed. For such purpose, the rotor slot shape design has a predominant impact above the others parameters and on the evaluation of the motor torque-speed characteristic. In this paper a systematic approach to optimize squirrel cage induction motors is presented. The adopted methodology permits to investigate with a reduced computational effort and high accuracy the performance of any SCIM included the ones featuring closed rotor slot geometry. Firstly, the most effective method to evaluate the performance is selected considering a trade-off between computational burden and the achieved accuracy. Then two different optimizations, deferring each other in the definition of the objectives, are performed and compared. The optimum results are finally selected and reevaluated among the torque-speed characteristics. The most significant geometries obtained are highlighted and commented.

Original languageEnglish
Number of pages6
Publication statusPublished - 2020
Externally publishedYes
Event10th International Conference on Power Electronics, Machines and Drives, PEMD 2020 - Virtual, Online
Duration: 15 Dec 202017 Dec 2020


Conference10th International Conference on Power Electronics, Machines and Drives, PEMD 2020
CityVirtual, Online


  • Closed rotor slot
  • Finite element analysis
  • Induction motor
  • Multi-objective optimization

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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