SNVAA20 July   2021 DRV8833 , DRV8833 , LMR33630 , LMR33630

 

  1.   Trademarks
  2. 1Introduction
  3. 2Motorized Resistive Load Architecture
    1. 2.1 Controller Board
    2. 2.2 Resistor Plate
  4. 3Motorized Resistive Load Design
    1. 3.1 Controller Board Design
      1. 3.1.1 Power Management
      2. 3.1.2 Power Converter Selection
      3. 3.1.3 Interface and ADC Selection
    2. 3.2 Resistor Plate Design
      1. 3.2.1 Motor and Motor Driver Selection
      2. 3.2.2 Resistor Track
      3. 3.2.3 Mechanical Arm Assembly
      4. 3.2.4 Feedback Control
  5. 4Thermal Considerations
  6. 5Performance and Results
  7. 6Summary
  8. 7Appendix
    1. 7.1 Controller Board Main Schematic
    2. 7.2 Controller Board Sub-Schematics
    3. 7.3 Resistor Plate Schematics
    4. 7.4 Python Code

3 Motorized Resistive Load Design

Manufacturing the described motorized resistive load requires designing the controller board and resistor plate, both of which can be broken down into smaller subsystems to simplify the design process. The controller board needs to manage and deliver power to all of the subsystems and generate the motor drive signals. The controller board also requires a user interface that includes a button, knob, and screen at a minimum to allow basic user control, in addition to an ADC that connects to the resistor plate to implement feedback to exact control on the resistive load. The resistor plate contains different ranges of load resistors, although a single range may be used to simplify the design. The resistor plate also contains the motor, mechanical arm assembly, and the feedback divider that will connect to a controller board ADC.