Realisation of the mechanical characteristic of a series excited DC machine in the drive with converter – fed induction machine

Grzegorz Skarpetowski,A Szeląg,H Gold,A Żurkowski,K Karwowski

doi:10.1051/matecconf/201818001007

Abstract

A control algorithm for converter-fed induction machines, which allows the operation of the drive along of mechanical characteristic similar to the characteristic of series-excited direct current machine especially suitable for adhesion traction drives, is presented.

Highlights

Converter-fed induction machines are at present time in the modern energy economical traction drives widely used
The analytical description of the relations used in the control method resulting in creation of series-excited machine properties is based at modified equivalent circuit of induction machine
The equation [6] describing the change of the torque along the “series” characteristic of a converter-fed induction machine, as a function of stator and rotor frequency, by constant value of stator voltage is as follow: ME (u, 1, 2 )

Summary

Introduction

Converter-fed induction machines are at present time in the modern energy economical traction drives widely used. In that application, which is still in continuous development are problems in the mechanical part of the drive observed, [1, 2, 3, 4], [8], which are connected with well-known problems of slip and slide dynamic states. The rapid change of the developed torque on the mechanical characteristic of induction machine in the region of normal operating points, generates an enormous dynamical stress, for electrical, but for the mechanical part of the traction channel, too. The suddenly sign change of the developed torque, reduce the traction force of the drive and cause overload and fast destruction and devastation of the mechanical parts of the drive

Presentation of the “series excitation” control method of induction machine

T2 T1 2

Conclusion