Printed circuit board having function of detecting deterioration and motor drive having the same

A printed circuit board formed of an insulating material and configured to mount a component and wiring thereon, the printed circuit board comprising:

• a liquid pool for storing a liquid including a water-soluble or water-insoluble cutting fluid, or a liquid adhesion portion to which the liquid adheres;
• a pair of deterioration detection traces one of which is connected to a power supply at one end and disposed in the liquid pool or the liquid adhesion portion at the other end, and the other of which is connected to a ground at one end, in which a resistor is connected to one end of the power supply or one end of the ground, and disposed in the liquid pool or the liquid adhesion portion at the other end;
• a voltage detection circuit for detecting a voltage between the one end of the one of the deterioration detection traces and the one end of the other of the deterioration detection traces;
• and
• a deterioration determination circuit for determining, based on the detected voltage, whether or not insulation deteriorates between the other end of the one of the deterioration detection traces and the other end of the other of the deterioration detection traces.