A Low cost modelling of the variable frequency drive optimum in industrial applications

Year 2018, Volume: 2 Issue: 1, 28 - 42, 31.03.2018

Ahmed Ali , Ergun Erçelebi

https://doi.org/10.30521/jes.405774

Cited By: 1

Abstract

A single or three phase
asynchronous motors, or known a squirrel cage motors (SCMs) are represent one
of generally using in many industrial applications. They are consuming further
than half-percent of the total generated electrical energy. This motor is
working at its full speed when it is attached to the main AC- supply. Therefore,
speed control of asynchronous motor is necessary to industrial applications
that require changeable flow control of fluid (air, water and chemical liquid
streaming). There are many methods to control the speed of motors, such as
changing the stator number of poles, controlling supply voltage, addition
series reactor or resistances. The modern method is Volt per Hertz, or scalar
control this method applied by changing voltage and frequency of three-phase
supply, or by making a V/f equal to a constant value in this method a large
amount of energy can be saved.

In this study, analysis and practical
implemented to variable voltage Variable Frequency Drive or called a VFD. The
model enables an exception of a large amount of energy, when connected to control
speed of Induction motor. A new simplified method for implemented of an AC
Drive system with a moderate price for components was proposed. This method
totally based on assembling overall components of AC-Drive. The advantage of
this design is simplicity, robustness and ease of tuning as well as
manufacturing due to these advantages. This design is very suitable for real
time applications as motor speed controller. The experimental results obtained
show that design helps to preserve a large amount of energy to the power grid,
by a limited starting current of the motor as well, eliminating a voltage
flicker at starting and reducing dissipating power during running in long
period. Results verified experimentally.

Keywords

Variable Frequency Drive, AC-Drive, Induction motor, Volt per Hertz

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