Abstract

This paper proposes a driving-scenario oriented optimal design of an axial-flux permanent-magnet (AFPM) motor for an electric vehicle. The target torque and speed (TN) curve is defined as three operation zones-constant torque, maximum direct current, and maximum voltage—based on the driving scenario. The AFPM motor is designed to minimize energy consumption based on the motor weight and the frequent operating points of a driving cycle. The final result shows that the electric vehicle driven by the proposed AFPM motor consumes about 15% less energy than motors designed using traditional methods.

Highlights

  • Increasing concerns about the natural environment and growing shortages of petroleum resources have driven many researchers to develop electric vehicles (EV)

  • Kahourzade et al [1] discussed a comprehensive design of a 10-kW axial-flux permanent-magnet (AFPM) motor for an EV direct drive based on the power and torque requirement

  • Qi et al [4] developed a method for predicting the flux-weakening performance of permanent-magnet (PM) brushless alternating current (AC) machines based on a d-q-axis flux linkage model in order to analyze the maximum working area of the torque and speed (TN)

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Summary

Introduction

Increasing concerns about the natural environment and growing shortages of petroleum resources have driven many researchers to develop electric vehicles (EV). Qi et al [4] developed a method for predicting the flux-weakening performance of permanent-magnet (PM) brushless alternating current (AC) machines based on a d-q-axis flux linkage model in order to analyze the maximum working area of the TN curve using the finite element (FE) method. They formulated the TN equations in terms of motor.

Simplified Vehicle Model
Driving Scenario
Torque
Y 1 ξ 2 X 2 ξ 2 X 4 ξ 2 X 2Y
Target and Speed
DC 2 M i I ph
Boundaries of the Torque and Speed Curves
I Pmax
Quasi-3-Dimensional Magnetic Circuit Model
Motor Sizing
Multi-Objective
Energy Loss During the Driving Cycles
Efficiency at the Rated Operation Point
Finite
A Figure are illustrated
Back Electromotive Force Constant Analysis
Torque and Speed
Asconstant shown inwas
Energy Loss and Thermal Analysis
64.3 Nm at awhen constant speed ofwas
Re‐Examination of Driving Scenarios
Re-Examination of Driving Scenarios
Findings
Conclusions
Full Text
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