Automatic HF model generation and impedance optimization for low voltage DC motors

This paper presents a high frequency (HF) generic electrical model for low voltage DC motors. A software model generator creates an electrical circuit which reproduces the high frequency impedance Z of any common DC motor within a frequency range from 150 kHz to 1GHz. Z is calculated only from construction and material parameters, like e.g. armature geometry and winding wire radius. With this model, it is possible to perform sensitivity analyses of motor construction parameters and optimize its design by finding parameters which best match a desired impedance curve. This can help finding a motor design with lower conducted electromagnetic interference (EMI).