Modular Multiphase Drives for Variable-Pole Induction Machines in Electric Vehicles

Libbos, Elie; Hao, Ruomu; Ku, Bonhyun; Banerjee, Arijit; Krein, P.T.

doi:10.1109/apec39645.2020.9124085

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…As n inv increases from nine to eighteen, dc link capacitance decreases by 48.5%. Only marginal improvement is achieved with n inv = 36 at the cost of a slight reduction in efficiency and increase in control complexity [21]. This is why an 18-leg inverter was selected over nine-and twelve-and 36-leg inverters even though all can meet the pole changing requirement.…”

Section: E Dc-link Capacitor Sizingmentioning

confidence: 99%

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

Libbos

Krause

Banerjee

et al. 2022

IEEE Trans. Power Electron.

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This paper 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 three-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 three-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 threeleg 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 three-leg inverter to validate the proposed framework.

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Section: E Dc-link Capacitor Sizingmentioning

confidence: 99%

“…The proposed framework is validated using two 890 VA GaN-based experimental inverters. A preliminary version of this work was published in [21].…”

Section: Introductionmentioning

confidence: 99%

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

Libbos

Krause

Banerjee

et al. 2022

IEEE Trans. Power Electron.

Self Cite

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show abstract

“…1 [4]- [6]. Overdesigning the inverter to improve the envelop decreased the efficiency and power density in [7], [8]. Alternatively, torque capability above the base speed can be improved substantially by electronically reconfiguring the IM to lower pole counts, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Refs. [7], [10]- [13] used toroidal windings (Gramme windings) to help achieve a wide set of pole counts through independent current control of each coil based on the number of inverter legs. For example, a 36slot machine driven by an 18-leg converter can be reconfigured to six-, four-, and two-pole count [11].…”

Section: Introductionmentioning

confidence: 99%

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

Libbos¹,

Krause²,

Banerjee³

et al. 2023

IEEE Trans. Transp. Electrific.

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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 polechanging capability, end-winding length, leakage, harmonic content, and inverter requirements. This paper 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 torquespeed 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.

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Performance Analysis of Variable Phase-Pole Induction Machine for Electric Traction Application: Finite Element Method

Tilahune,

Peretti,

Mamo

2023

2023 Ieee Africon

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Modular Multiphase Drives for Variable-Pole Induction Machines in Electric Vehicles

Cited by 6 publications

References 15 publications

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

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

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

Performance Analysis of Variable Phase-Pole Induction Machine for Electric Traction Application: Finite Element Method

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