Study of Making Model and Simulating for DC Motor Windings Based on ACA

The Electromagnetic Compatibility (EMC) of direct current (DC) motor windings is a system model which is able to reflect the functional characters of the system in the whole EMC specified frequency (150 KHz ~ 30 MHz). For most motor designing process, it always evaluated the inductance of windings in lower or working frequency; however, when analyzing the conducted interference, it is necessary to take some parameters in high frequency into account in building up the EMC model, such as the noticeable distributed capacitance among the windings or between windings and shells. Past research neglected the common-mode current generated by the high frequency interference through motor bearings coupled with shells, since the parasitic capacitance of rotor core comes from armature windings supplied sufficient paths. In EMC modeling for direct current (DC) motor problem, first test the impedance of windings by experiments, then generate the equivalent circuit with total parameters. At present, it is a difficulty that how to choose the parameters. Most researchers preferred to adopt analytical calculation, however, it could not reflect the essence of the model since it requires many simplification. As a result, this paper adopted ant colony algorithm (ACA) with positive feedback to intelligent search and global optimize parameters of equivalent circuit. Simulation result showed that impedance of equivalent circuit calculated by this algorithm was the same as experimental result in the whole EMC frequency.