scholarly journals Quantitative Comparisons of Six-Phase Outer-Rotor Permanent-Magnet Brushless Machines for Electric Vehicles

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2141 ◽  
Author(s):  
Yuqing Yao ◽  
Chunhua Liu ◽  
Christopher H.T. Lee
Keyword(s):  
Permanent Magnet ◽  
Power Density ◽  
Electric Vehicles ◽  
High Power ◽  
High Efficiency ◽  
Torque Ripple ◽  
High Power Density ◽  
Torque Density ◽  
Outer Rotor ◽  
High Torque

Multiphase machines have some distinct merits, including the high power density, high torque density, high efficiency and low torque ripple, etc. which can be beneficial for many industrial applications. This paper presents four different types of six-phase outer-rotor permanent-magnet (PM) brushless machines for electric vehicles (EVs), which include the inserted PM (IPM) type, surface PM (SPM) type, PM flux-switching (PMFS) type, and PM vernier (PMV) type. First, the design criteria and operation principle are compared and discussed. Then, their key characteristics are addressed and analyzed by using the finite element method (FEM). The results show that the PMV type is quite suitable for the direct-drive application for EVs with its high torque density and efficiency. Also, the IPM type is suitable for the indirect-drive application for EVs with its high power density and efficiency.

scholarly journals Design of Outer-Rotor Permanent-Magnet-Assisted Synchronous Reluctance Motor for Electric Vehicles

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3739
Author(s):  
Armagan Bozkurt ◽  
Ahmet Fevzi Baba ◽  
Yusuf Oner
Keyword(s):  
Permanent Magnet ◽  
Electric Vehicles ◽  
High Efficiency ◽  
Torque Ripple ◽  
Maximum Torque ◽  
Torque Density ◽  
Synchronous Reluctance Motor ◽  
Outer Rotor ◽  
Reluctance Motor ◽  
Minimum Torque

Today’s automotive industry has focused its studies on electric vehicles (EVs) or hybrid electric vehicles (HEVs) rather than gasoline-powered vehicles. For this reason, more investment has been made in electric motors with high efficiency, high torque density, and high-power factor to be used in both EVs and HEVs. In this study, an outer-rotor permanent-magnet-assisted synchronous reluctance motor (PMaSynRM) with a new rotor topology was designed for use in an EV. The design has a transversally laminated anisotropic (TLA) rotor structure. In addition, neodymium-iron-boron (NdFeB) magnets were used in rotor topology. The stator slots were designed as distributed windings, so torque ripples are minimized. At the same time, the maximum electromagnetic torque was achieved. The analysis of the designed motor was carried out using the finite element method (FEM). Optimal values of motor parameters were obtained by improving the rotor geometry of the three-phase PMaSynRM in order to obtain maximum torque and minimum torque ripple in the design. The motor is in a 48/8 slot/pole combination, a speed of 750 rpm and a power of 1 kW. The simulation results showed that the design achieved maximum torque and minimum torque ripple.

scholarly journals Optimized design of a high-power-density PM-assisted synchronous reluctance machine with ferrite magnets for electric vehicles

2017 ◽  
Vol 66 (2) ◽  
pp. 279-293 ◽  
Author(s):  
Xiping Liu ◽  
Ya Li ◽  
Zhangqi Liu ◽  
Tao Ling ◽  
Zhenhua Luo
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Torque Ripple ◽  
Optimized Design ◽  
High Power Density ◽  
Element Analysis ◽  
Synchronous Reluctance Machine ◽  
Torque Density ◽  
Reluctance Machine

AbstractThis paper proposes a permanent magnet (PM)-assisted synchronous reluctance machine (PMASynRM) using ferrite magnets with the same power density as rareearth PM synchronous motors employed in Toyota Prius 2010. A suitable rotor structure for high torque density and high power density is discussed with respect to the demagnetization of ferrite magnets, mechanical strength and torque ripple. Some electromagnetic characteristics including torque, output power, loss and efficiency are calculated by 2-D finite element analysis (FEA). The analysis results show that a high power density and high efficiency of PMASynRM are obtained by using ferrite magnets.

scholarly journals Design and Analysis of Rotor Shapes for IPM Motors in EV Power Traction Platforms

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2601 ◽  
Author(s):  
Myeong-Hwan Hwang ◽  
Jong-Ho Han ◽  
Dong-Hyun Kim ◽  
Hyun-Rok Cha
Keyword(s):  
Permanent Magnet ◽  
Electric Vehicles ◽  
High Power ◽  
High Efficiency ◽  
Torque Ripple ◽  
Hybrid Vehicles ◽  
Recent Increase ◽  
Interior Permanent Magnet ◽  
Rotor Shape ◽  
Two Hybrid

The recent increase in the use of permanent magnet rotor motors underlines the importance of designing a rotor with an interior permanent magnet (IPM) structure, high power, and high efficiency. This study analyzed the rotor shapes of IPM motors for electric vehicles. Five types of motor rotors for automobiles were analyzed, including two hybrid vehicles. In order to minimize the number of variables in the analysis, the size of the motor stators was fixed and only the rotor shapes were modified to compare torque, torque ripple, efficiency and back-electromotive voltage. When the motor properties were compared as a function of rotor shape, the rotor shape with the smallest magnet volume exhibited excellent results for torque, efficiency and torque ripple.

The Analyse of High-Power Density and High-Efficiency PMSM

2012 ◽  
Vol 516-517 ◽  
pp. 1651-1654
Author(s):  
Bing Yi Zhang ◽  
Sen Wang ◽  
Gui Hong Feng
Keyword(s):  
Optimal Design ◽  
Permanent Magnet ◽  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Permanent Magnet Synchronous Motor ◽  
Design Strategy ◽  
Synchronous Motor ◽  
Air Gap ◽  
High Power Density

This paper attempts to present an optimal design strategy and characteristics of high-power permanent magnet synchronous motor(PMSM). The structures of rotor lamination, calculation of Air-gap Length, how temperature influences the performance of the motor and the calculation of Xad、Xaq under the equivalent direct axis are presented.

scholarly journals Optimization and Analysis of a High Power Density and Fault Tolerant Starter–Generator for Aircraft Application

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 113
Author(s):  
Bo Wang ◽  
Gaurang Vakil ◽  
Ye Liu ◽  
Tao Yang ◽  
Zhuoran Zhang ◽  
...  
Keyword(s):  
Fault Tolerance ◽  
Permanent Magnet ◽  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Great Effort ◽  
High Power Density ◽  
Element Analysis ◽  
Starter Generator ◽  
Aircraft Application

Permanent magnet synchronous machines provide many dramatic electromagnetic performances such as high efficiency and high power density, which make them more competitive in aircraft electrification, whereas, designing a permanent magnet starter–generator (PMSG), with given consideration to fault tolerance (FT), is a significant challenge and requires great effort. In this paper, a comprehensive FT PMSG design process is proposed which is applied to power systems of turboprops. Firstly, potential slot/pole combinations were selected based on winding factor, harmonic losses and manufacture issues. Then, pursuing high power density, a multiple objective optimization process was carried out to comprehensively rank performances. To meet a fault tolerance target, electrical, magnetic and thermal isolation topologies were investigated and compared, among which 18 slot/12 pole with dual three-phase was selected as the optimal one, with a power density of 7.9 kW/kg. Finally, a finite element analysis verified the performance in normal and post-fault scenarios. The candidate machine has merits concerning high power density and post-fault performance.

Sign in / Sign up

Export Citation Format

Share Document