The widespread adoption of three-phase AC motors has led manufacturers to create an electronic speed control system for their operation. – dc frequency converter. This is a small device, consisting of digital circuits controlled by microprocessors. How it works and what are its functions in the system, we will describe in this article..
What are frequency converters made of?
All frequency converters have:
- rectifier (unmanaged or controlled), connected to one of the phases of an alternating voltage source of constant amplitude and frequency, which generates a ripple DC voltage;
- intermediate circuit, located in the converter, which takes energy from the rectifier and transfers it to the inverter, where is it converted. It comes in one of three types – this is an intermediate scheme: conversion of rectified voltage to direct current / converting constant voltage to voltage with an adjustable value / stabilization of pulsating constant voltage;
- inverter, generating voltage with frequency, required to power the engine. Each time the voltage is converted according to the load of the driving device, therefore, if necessary, the constant voltage is converted into an alternating voltage of the required magnitude and frequency;
- control system, which controls the operation of the drive system, receiving and sending signals, that is, interacting with other elements of the device. Each of them turns on or off the semiconductor gates of the inverter., responsible for generating voltage with certain parameters.
Functions of frequency converters
Frequency converters can control the speed and torque of motors, which saves a lot of energy in production. Their use smoothes the operation of the drive., ensures smooth start of the machine, thanks to which it is less susceptible to damage, and its operating costs are significantly reduced. The solution also helps to optimize the production process and increase the quantity of goods produced while reducing waste..
Some models are also used at home, usually used in pump and compressor motors. Also found in household, more advanced fans. Besides, sometimes used in automation systems for gates and wickets. There are many possibilities of using the inverter both inside the house., and outside.
How much does a frequency converter cost??
The price of frequency converters varies greatly. It all depends on the operating parameters of the device, method of management and degree of advancement. Simple frequency converters can be bought for several thousand UAH. However, newer, modern models can cost tens of thousands.
When choosing a frequency converter, you should pay special attention to its quality.. Only high-quality devices will provide high accuracy of engine speed control. The branded frequency converter will also have a long warranty period. While browsing the offers, pay attention to the products of ABB and Siemens. These are the leading manufacturers of frequency converters, their products have been appreciated by many professionals. You can buy ABB and Siemens converters in Ukraine in the Simat store. In addition, the company offers other products for production automation.:
- controllers;
- operator panels;
- circuit breakers;
- gas valve;
- soft starters, etc..
More information on the website simat.com.ua.
