Patent ID: 8008878

Claim:
Procedure for determining the electrical drive speed (ω ef ) or position (φ e ) in a permanent magnet rotor of a brushless electrical linear or rotation machine from a measurement of a multi-phase stator current (i 1 ,i 2 ) especially for an electrical drive regulation circuit, a) whereby the speed is seamlessly determined over the entire speed range, including standstill of the rotor, b) while using a mathematical rotor model ( 9 ) suitable for higher speeds, whereby from the influence of a rotor back EMF that affects the stator current (i 1 ,i 2 ) conclusions are made about the rotor speed (ω ef ) or position (φ e ) and an appropriate model speed value ( 13 , 19 , 23 ) is generated, c) and while using an injection procedure ( 32 ) suitable for lower speeds up to and including standstill, whereby a current-carrying stator winding is coupled with a test signal source ( 36 , 37 ) and the resulting stator currents (i 1 ,i 2 ) are assessed or filtered for position-sensitive anisotropies in the magnetic structure of the electrical rotor, from which conclusions can be made on the rotor speed (ω ef ) or position (φ e ) and an appropriate injection speed value ( 45 , 49 ) is generated, d) and with a fusion of the model and injection speed values ( 23 , 49 ) occurring in a combination element ( 50 , 51 ) that supplement each other for the estimated drive speed (ω e ,ω ef ), e) whereby corresponding with the increase in estimated drive speed (ω e ,ω ef ) the influence or the contributions of the injection speed values ( 45 , 49 ) relative to those of the model speed values ( 13 , 19 , 23 ) is weakened, characterized in that f) for weakening, the injection speed values ( 45 , 49 ) are weighted with coefficients (F) whose values decline with increasing speed, g) and the weighted injection speed values are fused with the model speed values ( 13 , 19 , 23 ) in the combination element ( 50 , 51 ), h) and the combined result from the combination element is used as the estimated drive speed (ω e ,ω ef ).