Design and Analysis of Single Stack AFPM Machines with and without Air gap Between Rotor and Magnetic Poles

Abstract

Permanent Magnet (PM) machines are widely used due to low cost, light weight, small size and better operating efficiency. In this paper, two single stack Axial Flux Permanent Magnet (AFPM) machines with air gap and without air gap are designed using Diameter to length (D2L) method. Various parameters are calculated with this approach. Power, back emf, coil flux and flux density are the parameters which are analyzed. Moreover, it was observed that power fluctuates in Single stack AFPM machines without air gap and power quality issue is taken into account. Apart from this, balance voltages are observed in both machines, while magnetic flux density decreases in machine with air gap and enhances without air gap. Solid Works is used for designing purpose and then JMAG designer tool is also used to perform analysis using Finite element method (FEM).