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Anonymous Poster

Motor Help

11/30/2006 1:49 PM

Hello,

I am working on an engineering design project, and I am having difficulty with some of the calculations.

We have a large waterwheel wich spins a small wheel attached to a dc motor. I can calculate the energy that the water wheel is bringing into the system, but I need a way to model how that energy is converted into electrical power by the DC motor.

I have these specs on the motor:

Max voltage: 9v

Free running RPM: 350

Free running current: 5 mA

Blocking Current: 350 mA

If any one could help me I'd be very thankful!!

-Jacob
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Anonymous Poster
#1

Re: Motor Help

12/01/2006 3:53 AM

The maximum power available from the motor is when the load resistance equals the motor resistance at 25.7ohm. Does that help?
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Mevel123
Power-User

Join Date: Apr 2006
Location: USA
Posts: 252
Good Answers: 6
#2

Re: Motor Help

12/02/2006 12:07 AM

Jacob,

If the waterwheel is bringing the energy into the system, then your motor becomes a generator. The mechanical power is converted to electrical power. The same motor theory applies to a generator, however the power flow is in opposite direction. Power flows into a generator's shaft, and flows out of the generator's electrical terminals, provided an electrical load is connected. The conversion is created by rotating coil(s) of wire in a magnetic field.

I am confused when you say a 'large' waterwheel and and then specify such a small generator. If this is homework then good luck, if this is not then perhaps you may want to double check your numbers?
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