Device and method for detecting characteristic frequency of motor vibration

Abstract

The invention provides a motor vibration characteristic frequency detection device. The device comprises a mounting base, a flywheel disk, counterweight mass blocks, an air flotation bearing, a flexible coupling, a carrying shaft, an acceleration sensor, a vibration test analyzer and a vibration isolator; a motor is mounted on the mounting base through the vibration isolator; the shaft of the motor is connected with the carrying shaft through the elastic coupling; the carrying shaft is supported by the air flotation bearing; the carrying shaft is provided with the flywheel disk; inertia adjustment holes are evenly distributed in the flywheel disk along a radial direction; the counterweight mass blocks are installed in the inertia adjustment holes; and the acceleration sensor is mounted on the outer surface of the motor and is connected with the vibration test analyzer through a wire. The motor vibration characteristic frequency detection device of the invention has the advantages of convenient installation and adjustment, low test cost, long sampling time, fast separation, adjustable load inertia and high repeatability. The influence of external vibration on motor test vibration is small; and an electromagnetic excitation frequency and a natural frequency can be detected and separated out with only one-time signal continuous acquisition required.

Description

Technical field [0001] The invention belongs to the field of motor vibration, and specifically relates to a detection device for the characteristic frequency of motor vibration. The invention also relates to a method for detecting the characteristic frequency of motor vibration. Background technique [0002] Electric motors are very common in engineering applications as power sources. Squirrel-cage asynchronous motors play an important role due to their simple structure, low price and long service life, and they are widely used. With the increasing requirements for the reliability of control systems in production, many motors need to test the reliability of their operation, and the characteristic frequency of the motor is an important object of investigation. Due to the diversity of operating modes, in the process of detection and fault diagnosis, different methods need to be used to extract fault features for different operating modes. It is often necessary to test the characte...

AI Technical Summary

Problems solved by technology

However, in engineering applications, due to the complex structure of the equipment, it is often impossible to obtain the accurate eigenfrequency of each part of the equipment

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