Reasons for non concentric shaft breakage of servo planetary reducer

Phenomena:

The phenomenon of non concentric shaft breakage in servo planetary reducers refers to the phenomenon that when checking the cross-sectional area of the output shaft of the servo planetary reducer, it is found that the outer ring of the cross-sectional area is brighter, while the color of the cross-sectional area is darker towards the axis. Later, there are traces of breakage (dotted marks) at the axis.

Solution:

When assembling the servo planetary reducer, ensure concentricity! When assembling the motor and planetary servo reducer, if the concentricity is ensured very well, the output shaft of the motor only bears rotational force, so that it will also run smoothly. However, when not concentric, the output shaft must withstand radial force from the input end of the planetary servo reducer. This radial force will cause the motor output shaft to be forced to bend for a long time, and the direction of the bending will constantly change with the rotation of the output shaft. The direction of the lateral force changes 360 degrees for each rotation of the output shaft.

At this point, if the concentricity error is large, the radial force causes the temperature of the motor output shaft to rise, and its metal structure continues to be damaged. The radial force will exceed the radial force that the motor output shaft can withstand, causing the drive motor output shaft to break. The greater the error in concentricity, the shorter the time it takes for the output shaft of the drive motor to break. Servo planetary reducer on the output shaft of the drive motor

At the same time as breaking, the input end of the planetary servo reducer will also bear radial force from the motor. If this radial force exceeds the radial load that both can withstand, the result will also cause deformation or even fracture of the input end of the reducer.