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# How to Find Diameter Of Rotor using Micro controller?

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#### nick703

Ok Now i have a PIC 18f4431 micro controller and LCD. i have completely find out RPM of rotor . now i want to calculate Rotor Diameter using RPM is that possible?

Yes then how ?

And No then what is the solution to measure rotor diameter using PIC micro controller? Please help me.

You can't work out the diameter with only the speed of rotation.

You can calculate it if you have two sensors around the circumference of the rotor and they are a known distance apart. If you know how long it takes a point on the circumference to pass between the sensors and how fast it is rotating (RPM) you can work out the diameter it must be to convert the angle of rotation into distance.

Brian.

nick703

### nick703

Points: 2

or give me a some link of that type sensor.

hello,

the only way is to know the linear speed of the rotor (on his circonference)
VL= PI * Dia * N
so Dia= VL / (PI * N)
N=RPM
VL in Meter per Minute
Dia in Meter

it is an unusual request ?
How do you can have an accees of the rotor circonference
inside the stator ?
what is for ?

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