Product specifications

Instrumentation Laboratory Exercise 51
5.4 Test procedure
You are now ready to measure the motor's speed- torque
characteristics. This is a very important characterization of a motor
required for understanding how it will perform with a given load. Set
the supply voltage to 5 V, and run your program. There will be some
minor variation in the speed and torque, but it should be relatively
stable. Now slowly load the motors disk by pressing on it with a piece
of paper. Note what happens with the speed and the motor current.
As the speed decreases, the motor current should increase linearly.
This is the motors torque curve. It should look like a straight line
descending from the stall torque (at zero speed) to a smaller torque
at the no- load speed. Load the motor repeatedly, clearing the plot,
and notice the response.