From Basic Solid Shafts to Hollow Shaft Encoder Mounts！

The original encoder design used a solid shaft. As the name implies, a solid shaft encoder has a solid bar that attaches to the motor and is attached using a flexible coupling and an external flange. There are some limitations with this design, specifically with the fact that the shaft requires an exact width and length to the shaft to fit into the motor and that it requires two external pieces (the flex couple and flange), which add to the size of the encoder. Solid shaft encoder is also susceptible to misalignment, which can impair performance.

Since the original solid shaft design, more mounting options have come around, like direct mounts and a C-face or ring mount. These have benefits – like the easier installation of direct mounts or the bearingless C face-mounts which reduce wear. However, these designs also have drawbacks, particularly in how difficult these designs are to install or in the overall size of the encoder profile.

A hollow shaft encoder is one of the most common shaft designs because of its versatility. Instead of having a solid bar that has to match the motor, a hollow shaft encoder fits over the motor shaft and is then clamped in place. It’s held in position by a flexible tether. This means that a hollow shaft encoder does not have to be perfectly sized to fit the motor and it does not require any external components which increase its size. A hollow shaft encoder also has a more forgiving installation; the clamp and the tether can be used to adjust the position and to absorb shocks and vibration that could cause misalignment.

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