Well what we will see next is how the electric motor behaves if there is a high rate of harmonic distortion, the engine will need a strong current that will be required by the motor rotor, so that it will turn mechanical power, then we can say that the engine is not.
In the case of high rate of harmonic distortion, higher current it is required by the engine as to enable the same mechanical power. So engines that are apparently correct edimensionados are in fact undersized. See more at best lp cc 12 product.
Network whose energy has many variations cause the same problem because an excessively below the nominal voltage causes the motor requires a higher current to activate the same power, while higher stresses will break the insulating material very quickly. And the faster it vary warmer it will be the shape of the engine surface.
Hence the importance of verifying how the engine works, learn the basic rules and also to know about the distortion rate.