Rotation angle estimation module for sensorless vector control of PMSM

摘要

A rotation angle estimation module is provided. The rotation angle estimation module includes: a fixed flux instruction estimation unit calculating a rotating flux (λ_sd, λ_sq) and a fixed flux instruction (λ_sα*, λ_sβ*) based on a rotation angle θ and the current (I_sα, I_sβ) of a fixed coordinate system; a fixed flux estimation unit calculating a fixed flux (λ_sα, λ_sβ) based on the voltage (V_sα, V_sβ) of the fixed coordinate system, and the current (I_sα, I_sβ) and fixed flux error (Δ_sα, Δ_sβ) of the fixed coordinate system; a fixed flux error estimation unit using the fixed flux instruction (λ_sα*, λ_sβ*) and the fixed flux (λ_sα, λ_sβ) to calculate the fixed flux error (Δ_sα, Δ_sβ) and feed the errors back to the fixed flux estimation unit; and a trigonometric function calculation unit calculating the rotation angle θ based on the rotating flux (λ_sd, λ_sq) and the fixed flux (λ_sα, λ_sβ).