Maximizing Motor Efficiency


In activity 1.2.5 you learned how to calculate the efficiency of the VEX motor when used to lift a weight. In this activity you will modify the conditions to optimize the motor efficiency. You might, for instance, lift more or less weight, or change to voltage, or change the gear ratio of the system.

  1. Define the Problem—review these rules and write a synopsis in your engineer's notebook. Research the topic using available resources.
  2. Generate Concepts—brainstorm ideas. Sketch possible solutions. Decide on a solution to develop further.
    1. Analyze the data from 1.2.5 to see which was the best design and the best voltage for maximum efficiency.
    2. Run your device with no load at the optimum voltage and record the current.
    3. Run your device at the optimum voltage while stalling the motor by holding the string and record the current.
    4. Consider how you could increase or decrease the gear ratio to the motor.
    5. Consider how you could reduce friction in the system.
  3. Develop a Solution—sketch the final design in your engineer's notebook.
  4. Construct and Test a Prototype
  5. Evaluate the Solution—compare your performance to other teams in the class. Decide on ways to improve your device. Modify and retest.
  6. Present the Solution—Document all six steps in the design process in your engineers notebook and provide an oral report to the whole class.




Last updated on 23 October 2017