| Abstract |
This paper presents an anisotropy-based position estimation approach taking advantage of saturationeffects in permanent magnet synchronous machines (PMSM).Due to magnetic anisotropies of the electrical machine, current responses to high-frequency voltageexcitations contain rotor position information. Therefore, the rotor position can be estimated by meansof these current responses. The relation between the high-frequency current changes, the applied phasevoltages and the rotor position is given by the inverse inductance matrix of the machine.In this paper, an analytical model of the inverse inductance matrix considering secondary anisotropies andsaturation effects is proposed. It is shown that the amount of rotor position information contained in thesecurrent changes depends on the direction of the voltage excitation and the operating point. By meansof this knowledge, a position estimation approach for slowly-sampled control systems is developed.Experimental results show the effectiveness of the proposed approach. |
