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Motor Selection
Motor Selection
The motor is used to drive the crosshead and must:
- Achieve crosshead extension speed of 1 mm/min
- Apply 500 N load with a 5.10 mm screw lead to sample
Ultimately we selected the Pololu 4694 brushed DC motor with integrated quadrature encoder.
Motor specifications obtain from Motor Specifications:
From the above solutions and our motor selection, at maximum efficiency:
- RPM = 120 RPM
- Torque = 39 [kg/mm]
The Pololu 4694 motor was chosen due to its peak efficiency. While our operating range will vary, we expect the 70:1 motor to best fit our average operating parameters thus maximizing efficiency. We also chose a motor with an encoder included due to the sensitive nature of our testing. This choice provides a closed feedback loop for more accurate position control during testing.
Figure 2: Brushed DC motor CAD
Figure 3: Motor Performance Chart
Figure 4: Motor Performance Graph
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