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Unread 15-11-2001, 05:04
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Question power of globe motor with gear box?

I've been trying to calculate the motor power of globe motor with gear box...

According to the manual, Globe motor with gear box have the following specs:

No load speed = 87 RPM +- 1
Stall Torque = 150 in-lb

If Motor power = ½ Free Speed X ½ Stall Torque

and

Free Speed in Rad/sec (1 RPM = 0.104 Rad/sec)
Stall Torque in N-m (1 in-lbs = 0.11 N-m)

Then the motor power = 1/2 * 9.05 Rad/s * 1/2 * 16.5 N-m
= 37.33 Watt...


But according to the motor presentation in white paper, Globe motor with gearbox have a motor power of 50W...

Am I doing this wrong? Am I lacking some additional info to calculate the correct motor power?
 


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