Stretch detection system for power transmission mechanism

A stretch detection system of a power transmission mechanism, which is connectable to a conveyor system including a motor, a rotation mechanism driven by the motor, and the power transmission mechanism driven by rotation of the rotation mechanism, the stretch detection system comprising:

• a frequency domain signal conversion unit that converts a signal of a current of the motor into a frequency domain signal;
• an integral value calculation unit that calculates an integral value by performing integration on the frequency domain signal obtained by the frequency domain signal conversion unit, by using, as an integration range, at least one of regions of a sideband wave having a frequency determined using a rotation frequency of the rotation mechanism;
• a stretch diagnosis unit that diagnoses a state of stretch of the power transmission mechanism by using the integral value calculated by the integral value calculation unit;
• and
• an output unit that outputs a diagnosis result of the stretch diagnosis unit.