Siemens S120 Braking concepts, Selecting the bearing, System integration 7.3 Bearings

System integration 7.3 Bearings

7.3Bearings

Selecting the bearing

1FW6 torque motors are built-in motors for direct rotary or swivel axes. To set up a complete drive unit, a bearing between the stator and rotor is required in addition to the phase-angle encoder system.

Your choice of bearing is governed by the following factors:

●Geometric requirements (internal and external diameter)

●Speed

●Load (magnitude, direction)

●Rigidity (accuracy, pretension)

●Service life

The bearing is not included in the scope of supply.

WARNING

Bearing currents and static charging of the rotor:

Depending on the design and properties of the bearing, the rotor may become statically charged.

Measures must be taken to prevent this (e.g. insulated bearing design or grounding).

Note

Radial forces are generated between the stator and rotor. These must be taken into account when you select the bearing (see also "Motor assembly)".

7.4Braking concepts

WARNING

Malfunctions on a rotating machine axes can lead to the drive coasting to a stop in an uncontrolled manner.

Measures must be taken to brake the drive at its maximum possible kinetic energy in the event of a fault.

1FW6 Built-in torque motors	109
Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3