The motor testing procedure requires the following equipment:


®      Magtrol Dynamometer Model HD-710-8

®      Magtrol Model 5210 Power Supply

®      Magtrol Model Number BL-001 Cooling Fan

®      5V DC Power Supply

®      22V DC Power Supply

®      Oscilloscope

®      Voltmeters (2)

®      Ammeter


Purpose: ††††† Establish a lab procedure to obtain necessary data from certain motors in order to plot a torque versus speed curve.


Procedure:††† 1)†† Obtain motor.

2)     Connect necessary output wires to motor.These wires may be used to†††††† collect data from the motor such as voltage and current draw.

3)     Place motor on test stand.For this step, a test stand may need to be fabricated specifically for the motor being tested.

4)     Connect motor to brake via a shaft.(Brake should be attached to Magtrol Dynamometer Model HD-710-8.)

5)     Supply 5V DC to the encoder.(See Magtrol Dynamometers manual for details.)

6)     Supply 22V DC to the torque output.(See Magtrol Dynamometers userís manual for details.)

7)     Turn on cooling fan (Magtrol Model Number BL-001).Caution must be taken while performing the test.Brake may overheat and cause permanent damage.(See Magtrol Dynamometers userís manual for horsepower versus time curves for maximum allowed testing times.)

8)     Turn on brake current supply (Magtrol Model 5210 Power Supply).This is used to vary the torque applied by the brake.

9)     With motor running, raise current being supplied to the brake slowly until the torque level reaches the stall torque of the brake.Record this value.

10) Connect oscilloscope to encoder output.†† (See Magtrol Dynamometers userís manual for details.)This frequency observed corresponds to the speed of the motor.

11) Connect voltmeter to torque output.(See Magtrol Dynamometers userís manual for details.)The voltage observed corresponds to the torque (100 mV = 1 N-m).

12) Connect voltmeter to voltage output on motor.

13) Connect ammeter to current output on motor.

14) Set brake current to value found in step 9.

15) Start motor.

16) Record necessary data.

17) Reduce brake current.

18) Record data.

19) Repeat steps 15 and 16 until brake current is zero.

20) Create plot using gathered data.


Data:††††††††††† The following table should be used to record data obtained from motor testing:


Table F.1 Ė Motor Testing Data Table



Table of Contents

Appendix E

Appendix G