A new integration method to estimate stator flux in induction motor with dc offset error

Abstract

A novel integration method to estimate stator flux in induction motor with dc offset error is proposed. The proposed method is able to solve the problem associated with a pure integrator for the estimation of stator flux in induction motor for operating in a wide speed range. A drift is produced by integration of dc offset error present in the estimated back Electro Motive Force (back-EMF) due to DC offset error in the measurement of phase current. The novel integration method eliminates the drift produced by the inherent problem of the pure integrator and calculates the measurement error of phase current.

Harmonic error observation of permanent magnet synchronous motor and its angle lag compensation method

“…[10][11][12] With the development of vector control technology (field direction control FOC) and direct torque control technology (DTC), PMSM has achieved significant improvement in speed range, speed control accuracy and dynamic performance. [13][14][15][16][17] In the fieldoriented control of high-performance PMSM, in order to overcome the influence of rotor position offset error and system delay time on the control performance of PMSM drive system, Lian et al proposed a new compensation techniques to precisely compensate the rotor position. The advantage of this method is that the rotor position offset and the compensation time coefficient can be accurately calculated even if the system delay cannot determine the specific time.…”