Patent ID: 8681506

Claim:
A motor control device comprising: a control board for controlling driving of an electric motor, the control board including a multilayer circuit board having at least one inner layer and an outer layer; and a ground pattern disposed continuously in a circumferential direction around an output shaft of the electric motor formed on the at least one inner layer; wherein the entire ground pattern adjacently surrounds the output shaft, the ground pattern having an annular shape; and wherein a severed portion is formed on a part of the ground pattern, so as to sever through the ground pattern in a radial direction of the output shaft; and wherein: the inner layer includes two layers; the other layer of the inner layers is a power supply layer, a power supply pattern disposed continuously in the circumferential direction around the output shaft of the electric motor is formed on the power supply layer, and on a part of the power supply pattern, a severed portion is configured to sever through the power supply pattern in a radial direction of the output shaft; and wherein the power supply pattern is disposed so as to face the ground pattern, and a capacitor is thereby formed by the power supply pattern and the ground pattern.