Silicon Prairie Initiative on Robotics in Information Technology

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Silicon Prairie Initiative on Robotics in
Information Technology

• DC Motor Parameters

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Mark max Torque Y Axis Mark Max RPM X Axis
X
Connect the points with a straight line
X
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Locate the Mid Point RPM
X
Trace a horizontal line to the Y Axis
This is the Design Torque Value
X
X
Mid Point RPM
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ALWAYS Record, Describe and Date the Data
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Measuring Armature Coil Resistance
The Multi-Meter selector is set to read
resistance in units called ohms (?). The
selector is set to the lowest range (0-200? ) The
Value measure is 0.9 ohms.
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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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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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Evaluating DC Motors
Determining Robot Speed
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Robot Speed Equations
Use this equation to predict the TekBots speed
ALWAYS Record, Describe and Date the Data
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