Patent ID: 7043395

Claim:
A motor system comprising: a rotor; a stator; a control for detecting a magnetic flux, a rotor position and/or a rotational speed of said rotor in a single- or multi-phase permanent magnet motor or -synchronous motor or -generator using the stator voltage equations: L·{dot over (i)} α =−R·i α +p·ω·ψ mβ +u α Equation (1) L·{dot over (i)} β =−R·i β −p·ω·ψ mα +u β Equation (2) in which L is the inductance i α a current in the direction α i β a current in the direction β {dot over (i)} α a derivative with respect to time of the current in the direction α {dot over (i)} β a derivative with respect to time of the current in direction of β R an ohmic resistance p pole pair number ω a rotational speed of the rotor ψ mα a magnetic flux in the direction α ψ mβ a magnetic flux in the direction β u α a voltage in direction α u β a voltage in the direction β wherein the evaluations, an energy conditions of the rotor are also taken into account.