Running 50Hz appliances on 60Hz power system

As long as the voltage is the same, and it is about purely resistive load there will be no practical difference between 50Hz and 60Hz, at least up to 300Hz. However, if there is an electric motor for the cooling of the appliance so it will be different:

A 50 Hz fan motor will rotate 20% faster RPM at 60 Hz, therefore will the fan blades to increase the torque by 40% while the inductance in the induction motor windings increases, the motor becomes overloaded if not the voltage to the motor is increased correspondingly.

If the appliance's electric motor is designed for 60 Hz will therefore be rotate at 20% lower RPM at 50 Hz and reduce the fan torque by 40%. There is no risk of overloading the motor, but a lowering of the cooling effect on the appliance and it can itself be a risk of overheating. Inductance of the electric motor is reduced by the lower frequency but compensated by the lower level of the motor slip, due to the lower speed. If you want to compensate for the lower airflow you can increase the fan area by 10%.

All of this demonstrated learning it is safer / easier to customize pumps and fans which are designed to 60Hz when you want to run them with 50Hz than if you have the corresponding 50Hz system that you want to run with 60Hz power supply.

Purely resistive load has no effect on the frequency, but feeding it with pure DC (or lower frequencies <40Hz), one must bear in mind that the power switch and controllers require completely different features than when using AC power supply.

We all know that the effect influence with the practical results is very low but it would be interesting if there is anyone who can go further into how much (or little) the effect affects the energy performance of an ordinary equipment in the 50 to 60 Hz in compared to pure DC. Moreover, we have to consider the differences in impedance, these are also small but not completely non-existent.