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Entry type: Application example Entry ID: 109774232, Entry date: 06/17/2020
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SINAMICS G: Load sharing for two coupled drives

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Load sharing must be implemented whenever two or more motors are mechanically coupled with one another. The "LLoadSharing_Control" function block is used for controlling two mechanically coupled motors with a configurable load sharing.

Load sharing must be implemented whenever two or more motors are mechanically coupled with one another. A mechanical coupling can be rigid, flexible or separable. Common types of coupling are for example:

  • shared shaft - can be rigid or torsionable
  • belt - can be oscillating
  • mating roll - firmly coupled through friction contact from material web, possible slippage or lose connection
  • vehicle with at least two drives

If the motors are controlled without load sharing, they can work against each other and even start oscillating.

The "LLoadSharing_Control" function block is used for controlling two mechanically coupled motors. The function block supports not only traversing of both drives with a configurable load sharing but also traversing of one individual drive.
The following control modes are available for load sharing:

  • Torque coupling
  • Speed override with torque limit
  • Droop and compensation

In the following figure the torques of the drives are opposite to each other. The same speed setpoint is forced by the mechanical coupling but both drives work against each other.

Mechanically coupled motors without load sharing

In following figure both torques are identical. The drives work together and share the load.

Mechanically coupled motors with load sharing

Downloads
  Documentation (1,7 MB)
 Registrierung notwendig  Library LLoadSharing V1.1 (346,6 KB)

Additional Information
A load balancing control with SINAMICS V90 is available in Entry ID 109794290 


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