Types of Harmonics in Induction Machine Drive and their Mitigation Techniques

Nowadays in many industries, variable frequency and variable speed motors are used according to load and consumer demand. So, it is important to change the speed of a motor for achieving load characteristics, for that to control the speed of a motor different types of electric drives are used due to their versatile qualities. Squirrel cage induction motor is mostly used in industries for a motion control system and many other industrial applications. Nonlinear loads act as a source of harmonics and they are responsible for many nuisances. Nonlinear loads are responsible for increasing harmonics in an induction motor. This paper contains examine of the impact of harmonics on induction motor performance and on power factor. This paper also discusses the reduction of harmonics using filters and prescribed method to the improvement of power factor. It also gives the introduction about harmonics injection method which is used to control the harmonic current.