Patent ID: 8664901

Claim:
A method for computing an estimated electrical angular speed of a permanent magnet machine, comprising: determining, at an electrical angular speed estimator module, whether three or more two-phase stationary reference frame feedback stator current samples (i α (k), i α (k+1), i α (k+2), i β (k), i β (k+1), i β (k+2)) have been stored; when three or more two-phase stationary reference frame feedback stator current samples (i α (k), i α (k+1), i α (k+2), i β (k), i β (k+1), i β (k+2)) have been stored at the electrical angular speed estimator module: computing, at the electrical angular speed estimator module, an estimated electrical angular speed (ω est (k)) of the permanent magnet machine based on the three or more two-phase stationary reference frame feedback stator current samples (i α (k), i α (k+1), i α (k+2), i β (k), i β (k+1), i β (k+2)) stored at the electrical angular speed estimator module, and a dimensionless gain that is computed based on a sampling time (T) and machine parameters.