A motor vibration signal acquisition and detection system is designed. The displacement signal is transformed into current signal by the sensor

convert current signal into ± 4 V voltage signal. And the MAX295 is used as a low-pass filter to filter out the high-frequency component of the acquisition system. AD7606 chip transmits the collected data to main control chip STM32 F429. And the system software is designed. The output pulse width modulation（PWM） wave of STM32 can control the sampling frequency of AD7606. Software not only realizes the real-time transmission and storage of data but also realizes the real-time display of signal spectrum and related parameters on the screen. Test result shows that the acquisition system is real-time and reliable.