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FFT Application

FFT OK/NG judgment, quality control
FFT Q-1-7 Quality control based on rotation speed variation of a DC motor or a fan motor

This application performs quality control based on rotation speed variation level of a DC motor or a fan motor.

The rotation frequency obtained from rotating speed of the DC motor or the fan motor and the number of pulses generated by the rotary encoder (the 600 P/R in the illustration above) are input to the FV-1500 F/V convertor as the center frequency. The FV-1500 outputs deviation from the specified center frequency (corresponding to rotation speed variation) as an analog signal. The CF-4700 performs frequency analysis of the deviation output and block comparison of amplitude levels of the deviation spectrum. In this way, quality inspection is established.

Judgment area block (max: 20 blocks) is set up by the specified frequency range and the upper/lower-limit levels on the power spectrum.The most suitable judgment method can be selected from 6 kinds of judgment methods (level, peak level, peak max, insideMax, partial overall or area rate of content). Also control with a PLC* can be performed using comparator output through the digital I/O function.

The CF-4700 can be connected to a computer through LAN or RS-232C interface and the data can be saved.

 
  Model Product name
1 CF-4700 FFT comparator
2 FV-1500 F/V converter
3 RP-432Z Roller encoder
4 RP-0169 Signal cable for the RP-432Z (5 m)
 

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