FPGA Hardware in the Loop Validation of Torque and Flux Estimators for Direct Torque Control (DTC) of an Induction Motor (IM)
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Date
2022
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Publisher
Université de M'sila
Abstract
This article provides a hardware implementation of torque and flux estimators for direct torque control
(DTC) of an induction motor (IM) on the Field Programmable Gate Array (FPGA). Due to its high processing
frequency, the FPGA circuit presents an alternative strategy for achieving a high performance DTC implementation.
This cannot be achieved by Digital Signal Processing (DSP) or Microcontroller application. Optimized hardware
architecture is also proposed for implementation of a complete estimator with explicit determination of all the
quantities such as the flux phase, the flux amplitude and the torque amplitude. This work presents a precise hardware
estimator of the torque and the flux, it developed with negligible estimation error (0.0002 [Wb] RMS estimate error
for the stator flux and 0.0005 [Nm] RMS estimate error the torque), in addition to that this estimator is implemented
on the Virtex-4 FPGA board with minimal resources(less 5% of slices registers, 5% of DSP48Es and around 17% of
LUTS). This estimator is developed and synthesized independently of the command and can be reused for any task
which requires the estimation of these quantities. After this the estimator was used to complete a DTC control in a
hardware co-simulation procedure with the Xilinx system generator and MATLAB/SIMULINK tools on the Xilinx
ML402 development kit.
Description
Keywords
FPGA, Hardware co-simulation, Xilinx generator system, Induction motor control, Flux and torque estimation.