METHOD FOR SENSORLESS ESTIMATING ROTOR POSITION AND ROTOR ANGULAR SPEED OF A SYNCHRONOUS RELUCTANCE MACHINE

摘要

It is disclosed a method for sensorless estimation of a position error signal (ϵ_θ) for a synchronous reluctance machine (5), said synchronous reluctance machine (5) comprising a stator and a rotor, said method comprising: receiving an observed flux linkage formula (i) of said stator; receiving a current model based flux linkage estimate formula (ii) of said stator; selecting a first projection vector formula (iii) wherein said first projection vector formula (iii) is expressed as formula (I), wherein: ω is the rotor angular speed; formula (iv) and formula (v) are components of an auxiliary flux linkage vector formula (vi) of said stator, wherein said auxiliary flux linkage vector formula (vi) is an orthogonal rotational matrix; G is a gain matrix; and I is an identity matrix; so that a rotor angular position error formula (vii), due to a stator resistance error formula (viii), calculated, at MTPA condition, by means of said first projection vector formula (iii) is within a band of one electrical degree; calculating a position error signal (ϵ_θ) as a function of said observed flux linkage (formula i) said current model based flux linkage estimate (formula ii) and said first projection vector formula (iii).