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Entry type: Application example Entry ID: 23939668, Entry date: 03/21/2014
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MICROMASTER 4: Closed-loop torque control and load distribution

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Task
In addition to a wide range of applications where drives are used to control the speed (variable-speed drives), there are also numerous cases where it is necessary to control the drive torque.

Typical applications for closed-loop torque controls are Axial winder:

Axial winders are used to wind and unwind material webs, cables, wires etc. Constant speed is not decisive – but instead constant tension over the complete winding range. The tension is controlled using a dancer roll, with tension measuring transducer or indirectly using the motor torque

Solution
The example discusses the possibility of implementing closed-loop torque control with encoder and without encoder (sensorless operation). Further, circuit versions and load equalization control for single and group drives are also discussed.


Figure 1: Closed-loop torque control with an encoder

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Documentation
Closed-loop torque control and load distribution
23939668_Closed-loop_torque_load_distribution_DOCU_v1_2_en.pdf ( 281 KB )

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