Impedance frequency response for a DC motor
Two possible RLC equivalent circuits accommodate the 100 ohm resistance at 0 Hz (below).
The second circuit of the two has a resonant dip at 1 MHz, while the first circuit of the two has a resonant peak at 1 MHz. Furthermore, the first circuit has -20dB slope above 1 MHz, while the second circuit has +20dB slope above 1 MHz.
First circuit meets all the criteria (100 ohms @ DC, resonant peak).






simulate this circuit &ndash; Schematic created using CircuitLab