Abstract
This paper describes the application of sensorless control for hybrid electric vehicles and an analysis of the influence of magnetic saturation on sensorless control. 3-phase high frequency voltage input sensorless control that provides information on rotor position using a simple integration procedure is proposed. To analyze the influence of magnetic saturation, a non-linear motor voltage equation is solved by using finite element analysis. Simulation results show good correlation with experimental results and clearly reflect the influence of magnetic saturation. The performance of 3-phase high frequency voltage input sensorless control is greatly improved by using analyzed results. The improved sensorless control algorithm is applied to hybrid electric vehicles and gives good startup performance of an internal combustion engine. The proposed approach is very useful for designing control algorithms, considering the influence of magnetic saturation in hybrid electric vehicle applications.
Highlights
In terms of high reliability and cost performance, various types of sensorless control algorithms have been proposed
The convergent point of the observer can be biased by an offset value D that is determined to reduce the angle error caused by magnetic saturation
The estimated angle and estimated engine speed follow the real angle and actual engine speed well while accelerating. These results show good tracking performance of the proposed sensorless control algorithm
Summary
In terms of high reliability and cost performance, various types of sensorless control algorithms have been proposed. Sensorless control based on variations in inductance is used for applications that require standstill operation [1]-[4]. This type of sensorless control, is affected by magnetic saturation. In some hybrid vehicle applications where high torque densities are required, concentrated windings are applied to realize shorter motor lengths These types of motors are affected by magnetic saturation. The rotor position can be estimated via simple integration using rotating 3-phase high frequency voltage input as follows. The convergent point of the observer can be biased by an offset value D that is determined to reduce the angle error caused by magnetic saturation.
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