Method in salient-pole permanent magnet synchronous machine

摘要

A method for determining the speed and position of a rotor of a salient-pole permanent magnet synchronous machine, the method comprising the steps of creating a voltage model (41) on a permanent magnet synchronous machine, forming a voltage reference (us,ref) for a stator of the permanent magnet synchronous machine, determining stator currents (is) of the permanent magnet synchronous machine, calculating a rotor angular speed (42) from the voltage reference (us,ref) and the stator currents (is) using the voltage model (41). The method further comprises the steps of forming with signal injection a position tracking signal (ε)of the rotor of the permanent magnet synchronous machine, forming a rotor angular speed estimate (ω̂m)from the calculated rotor angular speed (42) and the rotor position tracking signal (ε), forming a rotor position angle estimate (θ̂m) from the formed rotor angular speed estimate (ω̂m) and the rotor position tracking signal (ε).