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DC Motors

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viswa

New Member
Pl help me with this...
I am new to using DC motors. How to get the RPM of a DC motor for a particular application?:confused:
For eg. If i connect a wooden rod of nearly 20 cms to it and i want that rod to rise by an angle of 60 deg with the help of the motor. So for this application, pl temme how to find the RPM of the motor.
 

dougy83

Well-Known Member
RPM is revolutions per minute. You have not mentioned any time, so I don't really understand your question.

If the wooden rod is perpendicular to the motor axis, then any RPM will cause the rod to rise to 60 deg, so long as you stop it at 60 degrees.

I hope your question makes more sense to you than it does to me.
 
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Boncuk

New Member
RPM is of absolutely no importance for this application.

Measure the 60 degree angle and use a microswitch interrupting motor power if the rod touches the switch at the predetermined angle.
 

arunb

Member
or use a stepper, better because you can easily determine the pulses required to move for a degree.
 

viswa

New Member
RPM is revolutions per minute. You have not mentioned any time, so I don't really understand your question.

If the wooden rod is perpendicular to the motor axis, then any RPM will cause the rod to rise to 60 deg, so long as you stop it at 60 degrees.

I hope your question makes more sense to you than it does to me.
Am really sorry. Forgot to mention the time. Time for this action is 500msec.
 

dougy83

Well-Known Member
60 degrees is 1/6th of a resolution. 500ms is 1/120 of a minute. So rotation rate = 1/6 / (1/120) = 20 RPM
 
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