Rotor Slot Design of Squirrel Cage Induction Motors with Improved Rated Efficiency and Starting Capability

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

Research output: Journal PublicationArticlepeer-review

Abstract

Among the electro-mechanical devices transforming energy from electrical to mechanical, the squirrel cage induction motor can be surely considered a workhorse of the industry due to its robustness, low cost and good performance when directly fed by the a.c. grid. Being the most influencing motor topology in terms of energy consumption, optimizing the efficiency of squirrel cage induction motors could lead to a great impact towards the reduction of the human environmental footprint. The induction motor design aided by finite element analysis presents significant challenges because an accurate performance prediction requires a considerable computational burden. This paper makes use of an innovative fast and accurate performance evaluation method embedded into an automatic design procedure to optimize different rotor slot geometries. After introducing the performance estimation approach, its advantages and limits are discussed comparing its prediction with the experimental tests carried out on an off-the-shelf induction motor. Different rotor cage structures with increasing geometrical complexity are then optimized in terms of starting and rated performance adopting the same design optimization process, the same stator geometry and constituent materials. The analysis of the optimal solutions shows how it is possible to improve the rated efficiency without compromising other performance indexes. The presented results can be used as general design guidelines of squirrel cage induction motors for industrial applications.

Original languageEnglish
Pages (from-to)3383-3393
JournalIEEE Transactions on Industry Applications
Volume58
Issue number3
DOIs
Publication statusPublished - 2022
Externally publishedYes

Keywords

  • Bars
  • Boucherot Bar
  • Efficiency
  • Fast Performance Computation
  • Finite Element Analysis
  • Geometry
  • Inductance
  • Induction Motor
  • Induction motors
  • Iron
  • MultiObjective Optimization
  • Resistance
  • Rotor Slot Design
  • Rotors
  • Squirrel Cage

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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