Dynomomometer 3500

05-05-2009, Past Projects, Muhhamad M. Raza

Test Configuration:

The design which was developed is shown progressively in the figures below. The design was a brake dynamometer which measures the deflection of a stationary shaft. When the motor subjects the shaft to torsion through the pressure plates (brake) a gear mounted on the shaft twists slightly. The slight twist is amplified through a gear box. A protractor is mounted at the end of the gearbox and an indicator needle is placed at the output of the gearbox. The measurements of mph are taken through the venom speed meter and converted through the excel code to RPM. The voltage and current readings are taken through the LCD panel meters mounted on the exterior of the red toolbox. The deflection of the shaft, as mentioned above, is measured by the protractor. The speed is adjusted by the left knob mounted on the exterior of the red toolbox. The PWM frequency is adjusted by the right knob mounted on the exterior of the red toolbox. The chrome switch mounted on the far right the power switch for the LCD panel meters only. The power supply for the speed controller and the venom speed meter is provided via the 9V battery mounted on the chassis of the test setup, and must be removed to discontinue power. The power connectors on the right side of the red toolbox are for the power for the motor itself, and the switch on that side is for the power to the motor. The motor mounts on a wood stand and should be positioned coaxially with the shaft, other wise uneven wear will occur and the shaft will be subjected to bending. Testing is simply an iterative procedure of obtaining a broad spectrum of data points and plugging them into the excel spreadsheet labeled “Dynamomometer 3500,” which is on the included CD. Test procedures and other data is provided on this CD as well, please refer to them as needed.