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The field weakening mode allows a DC series motor to operate at higher speeds. To avoid chopper failure in this mode of operation, the field current must be regulated according to the motor speed. If the chopper fails, it drains a large amount of current from the battery, but it produces little torque, causing the motor speed to decrease below the base speed, which is undesirable. The purpose of this study is to explore the creation of a look-up table (LUT) of speed versus field current in the field weakening mode of four quadrants DC (FQDC). During the field weakening mode, the LUT is required as an input reference for the close-loop feedback control of the field current. Gradient descent (GD) is used to help to create the LUT. The LUT is utilized when the FQDC is in field weakening mode, which causes the motor to run faster than its base speed. The FQDC and the resulting LUT are tested using the MATLAB/Simulink simulation model. When evaluated utilizing the suggested four quadrants DC chopper for EV applications, the simulation results demonstrate that the GD effectively found the best ideal field current to produce the highest torque.

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Gradient Descend Approach for the Setting up of a Look-Up Table in the Field Weakening Mode of a Four Quadrants DC Chopper for Electrical Vehicles

  • 章节

  • 发表日期：

    2026年

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  • Norramlee Mohamed Noor,
  • Saharul Arof,
  • Abdul Malik Mohd Ali,
  • Hamzah Arof,
  • Emilia Noorsal

摘要

The field weakening mode allows a DC series motor to operate at higher speeds. To avoid chopper failure in this mode of operation, the field current must be regulated according to the motor speed. If the chopper fails, it drains a large amount of current from the battery, but it produces little torque, causing the motor speed to decrease below the base speed, which is undesirable. The purpose of this study is to explore the creation of a look-up table (LUT) of speed versus field current in the field weakening mode of four quadrants DC (FQDC). During the field weakening mode, the LUT is required as an input reference for the close-loop feedback control of the field current. Gradient descent (GD) is used to help to create the LUT. The LUT is utilized when the FQDC is in field weakening mode, which causes the motor to run faster than its base speed. The FQDC and the resulting LUT are tested using the MATLAB/Simulink simulation model. When evaluated utilizing the suggested four quadrants DC chopper for EV applications, the simulation results demonstrate that the GD effectively found the best ideal field current to produce the highest torque.