Energy losses modeling in induction motors fed by Danfoss VF micro drive FC51

The correct selection of appropriate induction motor for a specific electric drive represents an important issue, especially when VFD is applied for the motor supply. A number of different approaches were suggested for this aim. Methods of motors selection that founded on assessment and minimization of energy losses in the motor are preferable, since they provide optimal selection of a motor with a prolonged service time and maximum energy efficiency. There are three different kinds of losses in the motor: cooper resistive losses, mechanical and iron (core) losses. The present work describes the approach of iron losses estimation for a VFD FC51 of Danfoss Company. The method is based on the representation of supplied voltage (current) by the Fourier Transform and analytical description of iron losses by interpolation polynomials.