Expert Tips for Choosing the Perfect Motor - Maximize Your Design's Performance

[Kristafer]

Hello, I am working on a design, and I am having trouble selecting a motor. I will be able to supply 1.2 A and 12VDC, and I need the motor to be able to move a load of 0.5 lbs at 500 rpm. So far, I tried calculating torque (based on F=ma and T=Fr, r=1.06 in in this case). Then I used HP= (T*omega)/5252 to get a required Horsepower of 0.5. But I feel like this is wrong. Any advice would be greatly appreciated!

 

[rcgldr]

Move a load of 0.5 lbs at what speed, or should that be a load torque of 0.5 ft lbs at 500 rpm == 0.047601 horsepower ~= 35.5 watts. Input power is 1.2A x 12 V = 14.4 watts, so you'll need a bigger power supply.

 

[CWatters]

I will be able to supply 1.2 A and 12VDC, and I need the motor to be able to move a load of 0.5 lbs at 500 rpm.

As rcgldr said.. There is an issue with your units.

It takes power to accelerate a flywheel but the only power required to spin a 0.5lbs flywheel at a constant 500rpm is the power required to overcome losses (such as friction and/or air resistance).