SKF motor encoder units must be handled with care to avoid damaging the bearing, sensor and connecting cable. Never apply any force on the cable, cable outlet, sensor body or impulse ring.
On request, SKF can provide assistance in optimizing the mounting and connecting processes.
Mounting a unit on a shaft
Motor encoder units are typically mounted on a shaft with an interference fit. They can be pressed onto the shaft by applying a mounting force via a mounting sleeve or dolly abutting the inner ring side face (fig. 1). To facilitate mounting, the bearing inner ring can be heated:
- Use a temperature-controlled electric hotplate.
- Do not heat the unit above 80 °C (175 °F).
- Place the bearing on a mandrel to heat the inner ring effectively (fig. 2).
- Position the bearing so that the seal is in the lower position to avoid grease leaking out of the bearing.
- Do not use induction heaters as damage to the electronic components may result.
Mounting a unit into a housing
When motor encoder units have to be mounted into a housing with an interference fit, they can be pressed into the housing or the housing should be heated. The mounting force should be applied via a mounting sleeve or dolly abutting the outer ring side face or via a snap ring fitted on the outer ring (fig. 3).
In typical electric motor applications, the bearing can be moved into position by using bolts to pull the motor shield and cover together (fig. 4).
The cable should be protected by a duct to prevent it from making sharp turns, being pinched or making contact with any moving parts. To avoid any interference with the sensor signal, do not place the connector near other power cables or wires.