Evaluating DC Motors
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Acquiring the Data
Data Requirements
Caution: Wear Eye Protection. Work with Adult
supervision.
No Load RPM
Stall Torque
Graphing the Data
Mark max Torque Y Axis
Mark Max RPM X Axis
X
X
Connect the points
with a straight line
Graphing the Data
X
X
Locate the Mid Point RPM
Trace a horizontal line to the Y Axis
This is the Design Torque Value
X
Mid Point RPM
ALWAYS Record, Describe and Date the Data
Determining Design Torque
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Directly Measuring Motor Stall
Torque is a Learning
Experience.
Ammeter
Voltmeter
Sample Motor
NC MO Switch
12V Battery
Evaluating DC Motors
Determining Motor Stall Current
Measuring Armature Coil
Resistance
The Multi-Meter
selector is set to read
resistance in units
called ohms Ω (The Blue
portion of the selection dial)
The selector is set to
the lowest range (0-
200Ω )
The Value measure is
0.9 ohms.