Design of high-torque-density double-stator permanent magnet brushless motors

Wang, Y.; Cheng, Ming; Chen, M.; Du, Yi; Chau, K. T.

doi:10.1049/iet-epa.2010.0187

Cited by 71 publications

(31 citation statements)

References 9 publications

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“…Based on the power-size equation of the two motors [68], their dimensions should be designed according to a balance between the split ratio optimization principle and the power split requirement of the actual application. Such a dual-stator PM motor design method has been reported in [68,69]. The prototype of the dual stator motor is shown in Figure 23.…”

Section: Dual-stator Pm Brushless Ecvtmentioning

confidence: 99%

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

et al. 2015

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Abstract:The paper presents a number of advanced solutions on electric machines and machine-based systems for the powertrain of electric vehicles (EVs). Two types of systems are considered, namely the drive systems designated to the EV propulsion and the power split devices utilized in the popular series-parallel hybrid electric vehicle architecture. After reviewing the main requirements for the electric drive systems, the paper illustrates advanced electric machine topologies, including a stator permanent magnet (stator-PM) motor, a hybrid-excitation motor, a flux memory motor and a redundant motor structure. Then, it illustrates advanced electric drive systems, such as the magnetic-geared in-wheel drive and the integrated starter generator (ISG). Finally, three machine-based implementations of the power split devices are expounded, built up around the dual-rotor PM machine, the dual-stator PM brushless machine and the magnetic-geared dual-rotor machine. As a conclusion, the development trends in the field of electric machines and machine-based systems for EVs are summarized.

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Section: Dual-stator Pm Brushless Ecvtmentioning

confidence: 99%

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

et al. 2015

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“…The output power of a double-stator permanent magnet machine (DS-PM machine) [21] produced by the inner stator can be expressed as:…”

Section: Double-stator Permanent Magnet Machine Operating Principlementioning

confidence: 99%

“…The output torque produced from both the inner and outer airgap of a DS-PM machine [21] shown in Figure 5 can be calculated for the inner and outer stators. The torque produced by the inner stator in the inner airgap is derived as:…”

Section: Double-stator Permanent Magnet Machine Operating Principlementioning

confidence: 99%

Torque Distribution Characteristics of a Novel Double-Stator Permanent Magnet Generator Integrated with a Magnetic Gear

et al. 2016

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This paper presents a novel double-stator permanent-magnet machine integrated with a triple rotor magnetic gear structure, which is proposed to address problems of mechanical geared generators for low-speed applications. Torque transmission is based on three rotors consisting of prime permanent-magnet (PM) poles in the middle rotor and field PM poles in the inner and outer rotors. The proposed machine combines the functions of magnetic gearing and electrical power generation. The operating principles of the magnetic gear and generator are discussed and the torque distribution characteristics of the integrated machine are analysed using the 2D finite-element method (2D FEM). Also the power, torque, and speed characteristics are reported. A prototype is fabricated and tested experimentally. The predicted and measured results validate the proposed machine design.

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“…An improved efficiency and torque-density design of dual rotor PM machine is proposed in [1]; it is noted that, machines having toroidal windings could deliver higher output torque and better efficiency than their counterparts equipped with traditional winding topologies. Similarly, a doublestator PM machine capable of producing large torque is realized in [2], by adopting the optimal split-ratio of the machine. Further, other design parameters such as permanent magnet length, back-iron size etc.…”

Section: Introductionmentioning

confidence: 99%

The impact of machine geometries on the average torque of dual-stator permanent magnet machines

Awah

Okoro

2018

Nig. J. Tech.

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The influence of leading design parameters such as rotor radial size and arc lengths, aspect ratio, stator yoke thickness, stator tooth-width and slot-opening/slot pitch-ratio etc. on the average torque of permanent magnet (PM) machines having dual-stator arrangement is investigated in this study. Further, the effect of their different rotor pole numbers is also presented and quantitatively compared. The analyzed machines are optimized using the evolutionary approach with a goal for optimum torque yield. The analysis shows that, each of the varied machine parameters has an optimum value for maximum torque production owing to their varying electromagnetic reaction which tends to saturate at some point on the magnetic path. Moreover, the best performance amongst the investigated machines is given by the machine type having eleven rotor pole number.Keywords: average torque, dual start, machine geometry, optimal value, PM machines 1. INTRODUCTION The influence of machine design parameters on the overall performance of electric machines cannot be over-emphasized. This is because the output torque, power and hence efficiency of the machine ultimately depends on its optimal geometries. Thus, we have devoted this work to the impact of these design parameters which includes: the split-ratio, slot opening, stator back-iron thickness, stator tooth-width, and rotor radial size, etc. on the average torque of double-stator PM machines. An improved efficiency and torque-density design of dual rotor PM machine is proposed in [1]; it is noted that, machines having toroidal windings could deliver higher output torque and better efficiency than their counterparts equipped with traditional winding topologies. Similarly, a doublestator PM machine capable of producing large torque is realized in [2], by adopting the optimal split-ratio of the machine. Further, other design parameters such as permanent magnet length, back-iron size etc. were obtained by optimal sizing equations and also seen to contribute to the performance of the machine. In order to predict the electromagnetic performance of synchronous PM machines, fast analytical optimization techniques with high accuracy compared to finite element analysis is adopted in [3]. The investigation in [3] also revealed that, design parameters such as the

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Design of high-torque-density double-stator permanent magnet brushless motors

Cited by 71 publications

References 9 publications

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

Torque Distribution Characteristics of a Novel Double-Stator Permanent Magnet Generator Integrated with a Magnetic Gear

The impact of machine geometries on the average torque of dual-stator permanent magnet machines

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