US Patent No. 9,807,873

PRINTED CIRCUIT BOARD HAVING FUNCTION OF DETECTING DETERIORATION AND MOTOR DRIVE HAVING THE SAME


Patent No. 9,807,873
Issue Date October 31, 2017
Title Printed Circuit Board Having Function Of Detecting Deterioration And Motor Drive Having The Same
Inventorship Yasuyuki Matsumoto, Yamanashi (JP)
Kiichi Inaba, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,807,873

1. 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.