Permanent Magnet Flux Online Estimation Based on Zero-Voltage Vector Injection Method

Abstract

In this paper, a simple and accurate method is proposed for online estimation of the rotor permanent magnet (PM) flux linkage for surface mounted PM synchronous machines. By advantageously utilizing an injected zero-voltage vector, the effects of inductance in estimating the PM flux linkage is eliminated. The inverter voltage error and phase resistive voltage drop effects are minimized by repeating the test at different speeds. Therefore, as a result, only the voltage commands are needed for PM flux linkage estimation, resulting in great simplicity. Filtering the current ripple caused by the zero-voltage vector injection is not necessary. The proposed method can be used with sensored or sensorless fieldoriented control strategies. The experimental results have shown a good accuracy of the proposed new method. Index Terms-Permanent magnet (PM) flux linkage estimation, permanent magnet synchronous machines (PMSM), zero-voltage injection.

Online Parameter Estimation for Permanent Magnet Synchronous Machines: An Overview

“…[70]- [81]. Most online methods are concerned with the apparent inductance estimation since the terms of time derivation of dq-axis flux linkages are cancelled in the steady-state equation [70]- [92]. However, the injected AC signals [74] will induce nonnegligible incremental inductances, which have not been considered in the PMSM model ( 1)- (2).…”

“…"angle" and "magnitude", are introduced to estimate for thermal condition monitoring to prevent failure of the winding insulation, where a window function is developed to suppress the disturbance of the periodic current injection on the PMSM drive system [78] and [79]. By utilizing zerovoltage vector, the location of the rotor position and can be estimated from the measured current variations in the injected periods [92]. However, the additional zero-voltage vector injection will increase the current ripple.…”

PWM-Based Flux Linkage and Rotor Temperature Estimations for Permanent Magnet Synchronous Machines

“…affected by the variation in motor parameters due to . Likewise, by utilizing a zero-voltage injection scheme, flux linkage is directly determined with the measurement of the average value of the voltage commands which are the output of current loop PI controllers of the standard field-oriented control at different rotor speed [19]. In both methods, the dq-axis inductance terms are cancelled during the derivation of the methods, resulting in a parameter-independent estimation.…”

PWM‐based Flux linkage estimation for permanent magnet synchronous machines

“…[6] proposes an online method to estimate stator resistance and rotor PM flux linkage under constant load torque with two sets of dq ‐axis voltage equations corresponding to i d = 0 and the injection of a i d ≠ 0 test signal. Likewise, by utilising a zero‐voltage injection scheme, flux linkage is directly determined with the measurement of the average value of the voltage commands which are the output of current loop PI controllers of the standard field‐oriented control at different rotor speed [7]. In both methods, the dq‐ axis inductance terms are cancelled during the derivation of the methods, resulting in a parameter‐independent estimation.…”

“…Here, a relatively simple and accurate method is presented for online flux linkage estimation, which only involves in the measurements of voltage references and current in response to the standard SV‐PWM. Similarly to [6, 7], knowledge of inductances is not required for the estimation. Furthermore, this method does not need signal injection as the excitation signal is intrinsic in the PWM voltage.…”