In the design and manufacture of equipment that wants to keep the radial deviation close to zero, a single diaphragm (short type) coupling is generally used.However, this is actually an important reason for the failure.Even if you have confidence in the installation accuracy, for servo machinery, it is recommended to use a double diaphragm (long) coupling.
Compared with the double diaphragm, the radial rigidity of a single diaphragm is 10~20. Even if there is only a deviation of about 0.05 (mm), it will suffer a large deviation load, even if the coupling is not damaged in a short time. , It will also shorten the life of the bearing.In severe cases, the shaft may be damaged.In addition, when a failure occurs, due to the assembly space, it cannot be replaced with a double diaphragm.As a countermeasure, you must choose a polyimide (PI) diaphragm with low radial rigidity or an Oldham coupling that should be a servo system.