Unit Conversion, kRPM/V

1. Jul 3, 2011

Blues_MTA

For a motor modeling project im trying to find a value that is measured in Volts/kRPM (Voltage constant) , in the motor specs that I am given i have a value in RPM/Kv,

If the value for RPM/Kv given is 245, how can i find Volts/KRPM, or is that even possible

Thanks!

Last edited: Jul 3, 2011
2. Jul 3, 2011

rock.freak667

I assume K means 103

so 245 rpm/kV = 0.245 rpm/V

So now dividing by 1000, 0.245(10-3)krpm/V.

Just invert now to get the units of V/krpm.

3. Jul 3, 2011

Blues_MTA

So, it would be 1/0.245(10^-3)?

That comes to 408, which is a ridiculously high voltage constant, or at least from what ive seen anyway

4. Jul 3, 2011

cjl

My guess is that your second value is in kRPM/V, not RPM/kV. Very few motors run on thousands of volts, so RPM/kV wouldn't make sense as a unit.