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1 Research was conducted on reduction of circuit inductance for the purpose of reducing the surge voltage generated during switching by FET (field effect transistor / semiconductor device) in the power modules of motor controllers for golf carts (Fig. 1) and other electric vehicles. The motor control system is composed of the battery, the motor controller, the motor, and the wirings that connect them, and the inductance exists in them altogether. It became clear from simulation analysis and measurements from a prototype that only the inductance within the motor controller among these composition parts influences the surge voltage. And it became clear that there is a correlation between surge voltage and the sum of the inductance of the electrolytic capacitor inside the power module and the inductance of the circuit by which current is supplied from the electrolytic capacitor to the FET.