Field Oriented Control Clarification

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SUMMARY

The discussion centers on the implementation of Field Oriented Control (FOC) using a PI controller, specifically addressing the conversion of phase currents to voltage signals (Vsqref and VSdref). It clarifies that the controller is designed to mirror the physical system, where the motor receives voltage inputs and outputs current responses. The mathematical model of the motor is essential for designing the controller to track the reference current accurately. A resource link was provided for further clarification on implementing these concepts.

PREREQUISITES
  • Understanding of Field Oriented Control (FOC)
  • Knowledge of PI controller design and functionality
  • Familiarity with motor transfer functions
  • Basic grasp of voltage and current signal relationships in motor control
NEXT STEPS
  • Study the mathematical modeling of motors for accurate controller design
  • Explore the implementation details from the provided TI blog link on PI controllers
  • Learn about advanced control strategies in motor drive applications
  • Investigate simulation tools for testing Field Oriented Control algorithms
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Engineers and developers working on motor control systems, particularly those implementing Field Oriented Control and designing PI controllers for efficient motor performance.

Physicslearner500039
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I have seen in several documents on field oriented control for example in the below document. The inputs to the PI controller are phase currents but the outputs are voltages that is iSqref and iSdref is converted into Vsqref and VSdref. How the current signals are automatically converted to voltage signals I expected them to be current signals. Please help.

upload_2017-6-25_14-14-9.png
 
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Hi,
The controller is normally designed in such a way that it acts like a mirror image of the physical system it is going to control. In this case, the physical system i.e, the motor takes voltage as input and its response is measured as current. We know the mathematical model of the motor (transfer function between voltage and current). From this information, the controller (whether it is PI controller or some other type) can be designed to do exactly the opposite such that the reference quantity (in this case, the current) can be tracked.
 

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