Electric Motor Dynamometer

Electric motor performance varies significantly over time when exposed to different states of loading. It is necessary to quantify the relationship between load, performance and life span to accurately predict failures. This project designs and builds a direct-load testing rig for electric DC motors smaller than one horsepower. The testing rig will load-test the motors and measure the rotational speed to derive the force, efficiency and torque. Tests will be repeated for different load profiles to develop and analyse the performance, and ultimately the failure of the motor.

The motor testing dynamometer comprises of four main components; the load cell, the motor being tested, the tachometer and the stepper motor.

  • The load cell, on the left of the testing rig measures the tension in the rope which is used to calculate the braking torque exerted on the motor.
  • The motor being tested drives the rotating disc.
  • The tachometer is mounted on the rear of the motor on an extended shaft.
  • The stepper motor incrementally increases the tension in the rope.

Initially the device will output a torque vs rpm graph. The motor will then be run a different states of loading over extended periods to determine how the performance of the motor is effected.

Alex is in his seventh year of an engineering and commerce double degree alongside a french diploma. As a result of his degree he has received scholarships to study in Canada, Norway, France, China and he completed a three month engineering internship in London. He has had first hand exposure to the international nature of the engineering environment and would love the opportunity to work overseas to further broaden his horizons

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