4.8 Article

Inverter Design Considerations for Variable-Pole Induction Machines in Electric Vehicles

期刊

IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 37, 期 11, 页码 13554-13565

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3177082

关键词

Inverters; Legged locomotion; Torque; Voltage; Modulation; Rotors; Inductance; Electric vehicles (EVs); induction machines (IMs); multiphase drives; pole changing; power inverters; traction

资金

  1. Grainger Center for Electric Machinery and Electromechanics
  2. Power Optimization of Electro-Thermal Systems (POETS) NSF Engineering Research Center at the University of Illinois [R2.030.19]

向作者/读者索取更多资源

This article proposes a generalized inverter design framework for a variable-pole induction machine, quantifying the advantages of pole changing and a high number of inverter legs. The framework is used to design an 18-leg drive that increases torque capability by a factor of 2.2 compared to a conventional design, showing reduced losses and dc-link capacitance. Variable-pole operation reduces combined machine and drive losses by up to 45% compared to a conventional three-leg drive.
This article proposes a generalized inverter design framework for a variable-pole induction machine (IM). It quantifies the advantages of pole changing and a high number of inverter legs on converter efficiency and size. The framework is used to design an 18-leg drive that reconfigures a six-pole IM to four- and two-pole while increasing torque capability at maximum speed by a factor of 2.2 compared to a conventional 3-leg fixed-pole design. The framework also shows that a three-leg drive must be oversized by a factor of 1.5 to reach the same torque capability using an identical-sized machine. The proposed 18-leg drive has 50% less losses and requires 62% less dc-link capacitance compared to a 3-leg converter. The framework is used to propose a loss minimization method for the combined machine and converter, with pole count as an operational degree of freedom at partial load and high speed. As a result, variable-pole operation reduces combined machine and drive losses by up to 45% compared to a conventional three-leg drive with the same IM. An 18-leg experimental GaN-based 890 VA inverter driving a toroidally wound IM was designed, built, tested, and compared to a 3-leg inverter to validate the proposed framework.

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