Evaluating DC Motors Determining Motor Stall Torque and No Load RPM

The Test Bench Set Up Requirements Securely fasten motor to the Test Bench. Use #10 AWG or larger, Multi Stranded Wire. Battery or Batteries similar to those intended for use in the BattleBot. HD Automotive Starter Switch Caution: Testing motor torque creates strong electrical and mechanical forces. Wear Eye Protection. Work with Adult supervision.

Build a motor torque arm Special Equipment Use 1”x1”x1/16” steel angle 3/8” Shaft Collar

Create the Stall Condition 3 People should perform the test. Set up and hold the scale Mark the scale Energize/de-energize the system. Wear Eye Protection

Set Up and Hold the Scale Wear Eye Protection Motor Torque Arm Scale with Taped Marking Torque Arm Retainer

Create the Stall Condition Procedure Wear Eye Protection Assume the stations; Energizer Scale holder Scale marker Energize the System Raise the Torque Arm with the Scale Mark the Scale Deflection De-Energize. ALWAYS Record, Describe and Date the Data

Determining the Torque Value ALWAYS Record, Describe and Date the Data D F F = Force (lbs.) 3 lbs D = Length (ft.).5 ft Q = Torque (ft.lbs.) Q =D x F 1.5 ft.lbs. =.5 ft. x 3 lbs.

Measure No Load RPM Procedure Wear Eye Protection Mark Armature Shaft with Reflective Tape. Energize the System Read the No Load RPM De-Energize. ALWAYS Record, Describe and Date the Data

Directly Measuring Motor Stall Torque is a Learning Experience. Ammeter Voltmeter Sample Motor NC MO Switch 12V Battery