# induction motor

## A mathematical model of a frequency-controlled induction electric drive on the basis of the method of average voltages in integration step

Frequency-controlled electric drives are used in various industrial sectors due to the simplicity and reliability of the electric machine design, as well as the ability to provide the required control characteristics. This paper presents a mathematical model of a frequency-controlled electric drive with voltage source inverter developed by the Average Voltage in the Integration Step (AVIS) method and confirms its adequacy.

## Comparative Analysis of Systems Thyristor Voltage Converter — Asynchronous Motor With Serial and Parallel Adjustment

A comparative analysis of the influence of coordinate and parametric perturbations on the dynamic characteristics of the systems of subordinate (sequential adjustment) and modal (parallel adjustment) control in relation to the electric drive thyristor voltage converter — induction motor. For this purpose the uniform conditions of their functioning are provided. First of all, it is the synthesis of both systems according to the same standard (binomial) forms, as well as the effect of the same parametric and coordinate perturbations on the systems.

## An Application of the Altivar 320 Frequency Inverter as a Process Automation Tool

The article is shown the possibility and efficiency of the using of the ATV320 frequency inverter as an automation tool in case using of integrated logic controller ATV Logic. The example of practical realization of the control system of crusher electric drive is given.

## The Influence of Shunting Factor of Magnetic Flux of Shaded-pole Induction Motor on Steady-states

The influence of shunting factor of magnetic flux of shaded-pole induction motor on steady-states has been considered. The motor magnetic circuit is presented by the ramified equivalent circuit. The differential harmonic method of calculation of steady-states is using.

## Indirect determination of energy data and output power of an induction motor

A method for indirect determination of energy data and output power on the shaft of an induction motor (IM) is presented. It is demonstrated that the application of the proposed method makes it possible to estimate power efficiency of IM operation without its withdrawal from the manufacturing process with minimum information about electric drive (ED) parameters and under the conditions of the impossibility of using power equipment for the creation of special operating conditions and testing actions.

## Influence of Parameters of Induction Motor-Centrifugal Pump Units with Hydropaths Connected in Series on their Modes

Using the mathematical model of the pump station power supply system in steady-state modes developed by the author, the influence of the parameters of induction motor-centrifugal pump units with in-series-connected hydropaths of the pumps on their steady-state modes was studied. A comparison was drawn on the operation of a number of coupled units with different pump ratings. It was revealed that the difference in rated flow of the operating fluid in centrifugal pumps results in the fact that only the unit with the lowest operating fluid rated flow works effectively.