Patent ID: 8896259
Filing Date: 2014-11-25
Classification: B66B,H02P

Abstract:
1. A frequency converter, comprising: a load bridge and a control of the load bridge, for supplying electricity between the load bridge and an electric machine connected to the load bridge; a determination for at least one electrical parameter of the electric machine; and a determination for a position of a rotor of the electric machine; wherein the load bridge is fitted to supply to the electric machine a first, essentially sinusoidal alternating electricity excitation signal, having an essentially constant amplitude, and being essentially continuous in term of its fundamental wave, wherein the first alternating electricity excitation signal is formed as a function of the electrical angle reference θ of the electric machine, by changing the value of the electrical angle reference θ, and wherein the frequency converter is fitted to determine as another function of said electrical angle reference θ a first alternating electricity response signal corresponding to the first alternating electricity excitation signal, and wherein an initial angle of the rotor is determined on the basis of the first alternating electricity response signal.