Segment design of the complementary magnetic-geared dual-rotor motor for hybrid electric vehicles
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ORIGINAL PAPER
Segment design of the complementary magnetic‑geared dual‑rotor motor for hybrid electric vehicles Shichuan Ding1 · Min Cheng1 · Jun Hang2 · Le Sun3 Received: 2 August 2019 / Accepted: 4 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Magnetic-geared dual-rotor motor (MGDRM) has been considered as a promising candidate of the power split device in the hybrid electric vehicles. Essentially, the MGDRM is a pure electrical component without the brush, slip ring and mechanical gears, so its reliability and lifetime can perform well. However, the design principle of the MGDRM has not been fully transferred to a practical technology. The asymmetrical back-EMF of this motor is an issue, which is a sake of the torque ripple produced by the MGDRM. The complementary structure has been proposed to improve the back-EMF, but some detailed problems of this solution have not been addressed. This paper gives the analysis and discussion on the segment design of the complementary MGDRM. Two prototype machines are also fabricated for the experimental validation of the research results. Keywords Complementary structure · Hybrid electric vehicle (HEV) · Magnetic-geared dual-rotor motor (MGDRM) · Power split device (PSD) · Toyota hybrid system (THS) List of symbols Pin, Tin Input mechanical power and torque (outer rotor Pe Output electrical power (winding) Ptr, Ttr Output traction power and torque (inner rotor φv Outer air gap flux with v pole-pairs θ Position on the outer air gap circumference θir, pir Inner rotor position and pole-pair number θor, por Outer rotor position and pole-pair number Δθir0, Δθor0 Initial angles shift of inner and outer rotor al Amplitudes of the magneto-motive force harmonics cm Fourier coefficients of permeance distributions N General segment number along the axial direction Dso Outside diameter of stator * Jun Hang [email protected] 1
School of Electrical Engineering and Automation, Anhui University, Hefei, China
2
Shenzhen Research Institute, Southeast University, Shenzhen, China
3
School of Automation, Nanjing University of Science and Technology, Nanjing, China
Le Stator/rotor stack length θos Angle shift of the riveting holes for assembling wb Width of the flux barrier ηe Power conversion efficiency ηsplit Power split efficiency
1 Introduction Hybrid electric vehicles (HEVs) can promote the energy efficiency of the traditional internal combustion engine (ICE) vehicles [1]. Among the typical category of the HEVs, the series–parallel HEVs (SPHEVs) exhibit the unique feature [2]. Specifically, the series–parallel HEV can decouple the motion of the engine and the wheel while keeping the power transmission direct and high efficient. The critical device for realizing the series–parallel hybrid function is the continuous variable transmission (CVT) system [3–5], which is a common device in the vehicle powertrains. However, the CVT has several implementations. In the area of the electric vehicles (EVs), the Toyota Hybrid System (
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