Mechanical resonance detecting device and method

Abstract

The invention provides a mechanical resonance detecting device. The mechanical resonance detecting device is characterized in that the device comprises a sensor, an analog-digital conversion unit, an MCU, an interface unit and a power unit which is used for supplying electricity to the sensor, the analog-digital conversion unit and the MCU; the output end of the sensor is connected with the input end of the analog-digital conversion unit, and the sensor comprises a uniaxial piezoelectric simulation accelerometer used for sampling the acceleration magnitude of a vibration detected body; the input end of the analog-digital conversion unit is connected with the output end of the sensor; the input end of the MCU is connected with the output end of the analog-digital conversion unit; the interface unit comprises an RS485 bus, a CAN interface and a switching circuit which are all connected with the MCU. The invention further provides a corresponding mechanical resonance detecting method. By means of the mechanical resonance detecting device and method, the vibration data of the vibration detected body can be obtained in real time, the resonant frequency can be pre-judged in advance according to the resonance triggering condition, and in the system with the changed mechanical inherent frequency, the device and method are simple, reliable and high in adaptability.

Description

technical field [0001] The invention relates to the technical field of mechanical resonance, and more specifically, relates to a mechanical resonance detection device and a method for preventing mechanical resonance, which are applied to a motor drive system with variable frequency speed regulation. Background technique [0002] In the motor drive system with frequency conversion and speed regulation, the mechanical resonance generated has a great destructive effect on the machinery and structure of the system, causing equipment failure and system damage in the slightest, and causing safety accidents in severe cases. [0003] At present, in order to prevent mechanical resonance in the above-mentioned system, the following two methods are usually adopted: one method is to change the system machinery and structure so that the natural frequency of the mechanical system avoids the excitation frequency; the other method is to make the frequency converter excitation frequency skip ...

AI Technical Summary

Problems solved by technology

[0005] However, in the frequency converter test system, due to the different equipment under test, the natural frequency of the system machinery is different. In this way, it is time-consuming and inflexible to use software to set related parameters, and the system adaptability is poor.

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