Some customers have broken the output shaft of the drive motor after the equipment has been running for a period of time. Why does the output shaft of the drive motor break?
When we carefully check the cross section of the output shaft broken by the drive motor, we can see that the outer ring of the cross section is brighter, while the color of the cross section is darker at the shaft center, and finally there are broken traces (dotted marks) at the shaft center. This situation is usually caused by the misalignment between the drive motor and the reducer during installation.
When the installation concentricity between the drive motor and the reducer is well ensured, the output shaft of the drive motor bears only the rotational force (torque), and it will run smoothly without pulsation. When not concentric, the output shaft of the drive motor also bears the radial force (bending moment) from the input end of the reducer. The radial force will force the output shaft of the drive motor to bend, and the bending direction will change continuously with the rotation of the output shaft. If the concentricity error is too large, the radial force will cause the local temperature of the motor output shaft to rise, and its metal structure will be constantly damaged, which will eventually lead to the fracture of the drive motor output shaft due to local fatigue.
The greater the concentricity error between the two, the shorter the time for the output shaft of the drive motor to break. When the output shaft of the drive motor is broken, the input end of the reducer will also bear the radial force from the output shaft of the drive motor. If the radial force exceeds the maximum radial load that the input end of the reducer can bear, the result will also lead to the deformation or even fracture of the input end of the reducer or the damage of the support bearing at the input end. Therefore, it is extremely important to ensure concentricity during installation.
From the perspective of processing technology, if the drive motor shaft and the input end of the reducer are concentric, the drive motor shaft surface and the input end hole surface of the reducer will be very consistent, and their contact surfaces are close to each other, with no radial force and deformation space. If the installation is not concentric, the contact surfaces will not match or have gaps, which will cause radial force and provide space for deformation.
Similarly, the output shaft of the reducer is also broken or bent, and the reason is the same as that of the drive motor. However, the output of the reducer is the product of the output of the drive motor and the reduction ratio. Compared with the motor, the output is larger, so the output shaft of the reducer is more easily broken. Therefore, when using the reducer, customers should be more careful to ensure the concentricity of its output end during installation!
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