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Capstan with Slip

This example shows a capstan represented by a Belt Pulley block from the Simscape™ Driveline™ library. A 100-N tension applied to belt end A holds a variable load at end B in place, even as the load increases. When the load force increases past the friction limit, the belt slips. Increasing the friction by using a higher friction coefficient or wrap angle allows the pulley to hold an even greater load force. This example also shows how suddenly turning the capstan, starting at 5 seconds, causes momentary slip, which is quickly recovered.

Model

Simulation Results from Simscape Logging

The plots show:

1. The relative velocity between the capstan and the belt along with the holding force speed.

2. The capstan torque required to produce a change in the rotational speed and to resist the holding and load forces.

3. How the load force eventually exceeds the capstan force limit and causes slip.