Performance prediction of magnetless direct current machine using finite element analysis

Abstract

A direct current (DC) electric machine devoid of permanent magnets is developed and analyzed in this paper using finite element analysis (FEA) simulation approach. The investigated machine modules include: flux linkage, electromotive force (EMF), rotor magnetic  force, output torque, and core loss. It is revealed that the output characteristics of the investigated machine are closely related to its electric loading and its rotor angular speed; thus, the higher the value of these two parameters, the larger its electromagnetic output performance. For instance, the obtained force magnitudes of the analyzed machine at fixed speed of 500 rpm and varying armature current of 5 A, 10 A, 15 A and 20 A are 31.26 N, 63.18 N, 95.75 N, and 128.97 N, respectively. Similarly, the resultant electromotive force amplitudes of the machine at different rotor speed i.e. 500 rpm, 1000 rpm, 1500 rpm, 2000 rpm, and 2500 rpm are 0.28 mV, 0.56 mV, 0.83 mV, 1.11 mV, and 1.38 mV, respectively. The analyzed machine would be suitable for low speed direct drive applications, owing to its brushless nature.