Electromagnetic Design And Characteristic Analysis Of Three-phase Disc Induction Motors

Axial flux induction motor(AFIM) has the advantages of short axial dimensions, flat in the disk, compact structure, small volume, high power density, high starting torque, simple structure, stable performance, easy to maintain, easy to heat dissipation; its air gap is adjustable and it can also be made with multiple plate structure. With the improving of technology and process and the demand of particular area, AFIM drew experts and scholars attrition.According to the basic formula of electromagnetic of disc induction motor, the choice of diameter ratio and air gap, winding design, parameters and performance calculation and the magnetic circuit characteristics of AFIM, a 2k W three-phase disc induction motor was designed, and the electromagnetic calculation program was written.Average diameter method, sub-loop calculation method and 3D finite element method(FEM) was adopted to study on the stator magnetic field of three-phase disc induction motors, the advantages and disadvantages of the three methods was compared and analyzed. And it was concluded that the average diameter method was effectiveness and practicability in the calculation of disk motor magnetic field. The average diameter method was adopted to analyse the air-gap flux density of the disc induction motor on no-load and rated load conditions and the corresponding dynamic characteristics, and the speed, the electromagnetic torque, power factor ande fficiency was verified and met the design requirements. At last the influences of rotor palte thickness and material on motor performance were analysed.Analytical method, sub-loop calculation method and 3D FEM was adopted to study profoundly on the stator magnetic field of three-phase disc induction motors and the distribution characteristics of AFIM stator magnetic field along the radial was analysed. Through the comparison and analysis of the result of air-gap flux density of the three methods, the reason of the difference was discovered, a radial air-gap coefficient was put forward, empirical formula was given and its validity was verified by numerical examples.