evaluating dc motors determining motor stall torque and no load rpm
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Evaluating DC Motors
Determining Motor Stall Torque and
No Load RPM
The Test Bench Set UpRequirements
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 ScaleWear Eye Protection
Motor
Torque Arm
Scale with Taped Marking
Torque Arm Retainer
Create the Stall Condition
ProcedureWear Eye Protection
Assume the stations; EnergizerScale holderScale marker
Energize the SystemRaise the Torque Arm with the ScaleMark the Scale DeflectionDe-Energize.
ALWAYS Record, Describe and Date the Data
Determining the Torque Value
ALWAYS Record, Describe and Date the Data
DF
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
ProcedureWear 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
VoltmeterSample Motor
NC MO Switch
12V Battery
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