Optimum Design of Slotted Axial Flux Internal Stator Motor Using Genetic Algorithm for Electric Vehicle

Abstract

Axial flux permanent magnet motors having a dual air-gap configuration have been designed and constructed to achieve high power density and used in industries interestingly and specially in the system of driving electrical vehicles. In this paper, the equation related to the design and dimensions of double-sided slotted axial flux synchronous motor with internal stator (TORUS) will be investigated. Then, an optimum design based on genetic algorithm with the purpose of increasing power density is presented. Twodimensional finite-element analysis (FEM) is used to demonstrate these optimization and its results will be presented. Finally, it presents the resultant back emf waveform and current for a 1.0 kW, 48 V, 50 Hz, 4poles/15-slots TORUS slotted axial motor prototype, based on our optimization techniques.

Genetic Algorithm Application for Optimum Design of Three Phases Disk Type PM Motor

“…Where, η is machine efficiency, m is number of phases of the machine, The quantity K the electrical power waveform factor, K incorporates the winding distribution factor K spanned by the salient poles of the machine (if any), N flux density in the air gap, f is the converter frequency, p is the machine pole pairs, diameter ratio for AFPM defined as D the diameter of the machine inner surface [1,7].…”

“…is machine efficiency, m is number of phases of the machine, The quantity K the electrical power waveform factor, K i is current waveform, K e is the EMF factor which incorporates the winding distribution factor K w and the per unit portion of the total air gap area spanned by the salient poles of the machine (if any), N ph is the number of turn per phase, Bg is the flux density in the air gap, f is the converter frequency, p is the machine pole pairs, AFPM defined as D i /D o , D o is the diameter of the machine outer surface, D the diameter of the machine inner surface [1,7]. can be written as…”

“…Where r µ is the recoil relative permeability of the magnet, B r is the residual flux density of the PM material, K d is the leakage flux factor, K c is the Carter factor, K f =B gpk /B g is the peak value corrected factor of air gap flux density in radial direction of the AFPM motor. These factors can be obtained using FEM analysis [1,5].…”

“…Among the various configurations of AFPM motors, double-sides disk type PM motors, has the most and best application especially in Electrical Vehicles. Disk type PM motors are designed with slotted stators and without slot (or slot-less), that the slot configuration has the high robustness and power density that without one [1], [6].…”

A Novel Double Rotor without Stator Electric Motor: Theoretical and Functional Aspects

“…Double rotor permanent magnet motor has become a research topic especially for electric vehicle driving system, as this kind of motors can provide higher torque generation in comparison to the conventional interior permanent magnet motors [10]. Several kind of dual rotor motors of this sort have been reported in recent literatures, such as: (i) double-sided slotted axial flux motor having two outer permanent magnet rotors and one inner winding stator [11,12]; (ii) dual rotor motor consisting of an outer stator, inner wound rotor and outer permanent magnet rotor [13]; (ii) dual rotor motor consisting of double stator as well as double rotor for electric moving vehicle that structurally seems to be two independent motors integrated into one [9]; (iii) dual rotor motor consisting of one inner and one outer permanent magnet rotors and one winding stator at the centre [10]; (iv) dual rotor motor consisting of one inner and one outer permanent magnet rotor and one toroidally wound stator at the centre [14], and the like. There are also literatures on dual rotor induction motor [15,16].…”