Motor controller, motor and pump device

A motor controller which controls a motor having a three-phase coil, the motor controller comprising:

• a motor control part which controls rotation of the motor by a control signal;
• an inverter which applies a drive voltage supplied from a driving power source to the three-phase coil based on an output signal from the motor control part;
• a drive voltage line which supplies the drive voltage to the inverter;
• a common line which is electrically connected with a neutral point of the three-phase coil;
• an inductor which is electrically connected in series with the drive voltage line;
• a first capacitor which is electrically connected between a portion between the inverter and the inductor in the drive voltage line and a ground;
• a second capacitor which is electrically connected between a portion on an input side with respect to the first capacitor in the drive voltage line and the ground;
• and
• a third capacitor which is electrically connected between the second capacitor and the ground;
• wherein the common line is electrically connected between the second capacitor and the third capacitor.