Design Parameters for VFD Sizing

Buy a VFD rated for 10HP at 415V... That is how they are rated.

Of course, 415V implies you are not in North America which is about the only place left that uses HP instead of kW, so VFD manufacturers will not show a "HP" rating for a VFD at 415V on their charts. But you can just use the formula 746W/HP to determine the kW rating of your motor, then buy a VFD rated for that kW or greater.

Also there are other properties like V/f control, vector control,shaft sensorless control, THD of input harmonics etc. I suggest you to be aware of these properties and choose the one that best fits your application and pocket out of the alternatives

VFD's are current rated devices, and should not be sized by HP. Use the FLA rating on the motor and your desired overload rating to size it. Motors with indentical HP ratings can have different FLA ratings do to efficiency and the motors base speed.

The overload ratings are typically 110% for Variable torque and 150% for constant torque, these ratings are for an ambient of 40C or less. Above 40C you would need to derate the current output of the drive. Typical derate is 1% per degree C over 40C.

Check the manufacturers data sheets the overload ratings and continuous current ratings will vary slightly from manufacturer to manufacturer.