The Design of a Permanent Magnet In-Wheel Motor with Dual-Stator and Dual-Field-Excitation Used in Electric Vehicles

Abstract

Abstract:The in-wheel motor has received more attention owing to its simple structure, high transmission efficiency, flexible control, and easy integration design. It is difficult to achieve high performance with conventional motors due to their dimensions and structure. This paper presents a new dual-stator and dual-field-excitation permanent-magnet in-wheel motor (DDPMIM) that is based on the structure of the conventional in-wheel motor and the structure of both the radial and axial magnetic field motor. The finite element analysis (FEA) model of the DDPMIM is established and compared with that of the conventional in-wheel motor. The results show that the DDPMIM achieves a higher output torque at low speeds and that the flux-weakening control strategy is not needed in the full speed range.

Analytical Model for the Design of Axial Flux Induction Motors with Maximum Torque Density

“…The results below will be for solving the problem of designing a low-voltage AFIM with four pole pairs. Such motors can be widely used in small electric transport [17][18][19][20], for example, in electric bicycles or electric kick scooters, i.e., in devices with severely limited consumption. Initial data for the design are given in Table 1.…”

“…The most significant variables defining all the characteristics of the machine are the axial length of the stator, which determines the relationship between the stator and the rotor (see Section 2.1) and flux density in the air gap. These variables mainly determine the value of the electromagnetic torque (19). As these variables are independent of each other, one can find the extremes of this expression from them.…”

Selected Aspects of Decreasing Weight of Motor Dedicated to Wheel Hub Assembly by Increasing Number of Magnetic Poles

“…The issue of optimization of the wheel hub motor structure and the selection of appropriate materials has been discussed by many researchers [10]. There are publications in which various types of electric motors of various designs are selected for use in vehicle drive wheels [11][12][13][14][15][16][17][18]. In industry, technologically advanced structures are most often permanent magnet synchronous motors with external rotors [19][20][21][22][23][24][25].…”

Performance Assessment of Axial-Flux Permanent Magnet Motors from a Manual Manufacturing Process

“…The concept of electric vehicles is expanding into the areas of passenger cars, trucks, buses, and special purpose vehicles. This requires engineers to consider the design of electric motors with suitable thermal-management systems, inverters, and motor controls [1][2][3]. The manufacture of these vehicles requires the development and launch of electrical machines with low noise levels, improved motor performance, high efficiency, a high level of reliability, intensive active cooling of the stator (as well as, in many cases, of the rotor), and a long lifespan [4][5][6].…”