Silicon Prairie Initiative on Robotics in Information Technology

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Silicon Prairie Initiative on Robotics in
Information Technology

• Stepper Motor Parameters
• And Testing

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Simplified Analysis Model
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H-bridge IC
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Testing a Stepper Motor
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Determining the Torque Value
F Force (lbs.) 3 lbs D Length (ft.) .5 ft Q
Torque (ft.lbs.)
F
D
Q
D x F
1.5 ft.lbs. .5 ft. x 3 lbs.
ALWAYS Record, Describe and Date the Data
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Measuring Armature Coil Resistance
Set the meter to read ohms. Use the lowest range.
Short the meter leads and record the value. This
is the meter error value. Attach your meter to
the two motor leads. Slowly turn the armature
shaft and record values at 45 intervals. Average
these values.
Caution Turning the armature shaft quickly,
induces a current in the armature windings. This
Will damage the meter.
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Calculate the Stall Current
E
Ohms Law The basic Algebra of electronics
I
R
I Current in Amperes
E Voltage
R Resistance in Ohms, ?
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