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A simple formula can be used to roughly determine what is needed power-wise.
Here’s an example:
Motor Speed:
3600 RPM
Motor Torque:
340 mNm = 48 inoz = 3 inlb
Voltage:
12VDC
Assumed Eff %:
80 %
Power Output:
( Speed x Torque(inlb) ) / 84.5 => (3600 x 3 ) / 84.5 = 127 Watts Output
Power Input:
Watts Output / Assumed Eff% => 127 / 0.8 = 159 Watts Input (Required)
Current Requirement:
Watts Input / Voltage => 159 / 12 = 13.2 Amps (Minimum)