Winding Layout Considerations for Variable-Pole Induction Motors in Electric Vehicles

Elie Libbos, Elisa Krause, Arijit Banerjee, Philip T. Krein

Research output: Contribution to journalArticlepeer-review

Abstract

Winding layout plays a crucial role in enabling variable-pole operation in an induction machine (IM). Several winding design alternatives, which consist of toroidal and distributed single- and double-layer windings, have been shown to increase speed range and improve partial load efficiency in traction applications. These windings have different pole-changing capability, end-winding length, leakage, harmonic content, and inv erter requirements. This article compares these winding alternatives with a generalized variable-pole machine design framework that captures the impact of winding selection on key performance metrics such as losses, volume, and torque-speed envelop. This framework shows that the core aspect ratio, defined as ratio of stack length to rotor diameter, selected to minimize losses depends on whether a distributed or toroidal winding is used. When a toroidally wound IM is designed with a low aspect ratio, it can provide the largest torque-speed envelop with highest efficiency over a wide speed range. An experimental toroidally wound IM driven by an 18-leg converter is used to validate the design framework. The experimental setup is configured externally to emulate a single-layer winding and to show benefits gained from the extra pole-changing flexibility of a toroidal winding.

Original languageEnglish (US)
Pages (from-to)5214-5225
Number of pages12
JournalIEEE Transactions on Transportation Electrification
Volume9
Issue number4
DOIs
StatePublished - Dec 1 2023
Externally publishedYes

Keywords

  • Electric vehicles (EVs)
  • induction machine (IM)
  • motor design
  • motor windings
  • multiphase drives
  • pole changing
  • traction

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Transportation
  • Automotive Engineering

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