Frequency converters from the KEV company

The KEV company was founded in 1972. To date, the sales volume of KEV, which has already become not just one company, but a whole group of companies, amounts to 210 million Euros per year. Every year, KEV produces more than 150 thousand frequency converters and servo control devices, more than 300 thousand electromagnetic clutches and brakes, and more than 50 thousand gear motors.

The KEV group of companies is more than 1,200 employees who work all over the world, implementing innovative technologies in the field of drive equipment. About 100 specialists work on research and development of ways of technology development. Special solutions were invented for a number of developments.

Thanks to the features of these technologies, the best result was achieved in various areas:

 - textile production;

 - production of plastic;

 - wood processing;

 - cement industry;

 - production and modernization of cranes;

 - means of transportation;

 - wind energy;

 - production and modernization of machines;

 - escalators and elevators;

 - packaging and food industry;

 - production of pumps, compressors and fans.

KEB Combivert drives are high-torque and high-dynamic drives with improved quality control.

They are endowed with the following features:

 - the accuracy of maintaining the process parameters is high, regardless of the speed range;

 - extended speed switching range;

 - increased separation speed capacity;

 - high overload capacity. The equipment will work continuously even at specific moments and when operating in special conditions;

 - high positioning accuracy;

 - availability in settings and maintenance;

 - possibility of use in multi-motor electric drive systems.

If necessary in production, KEB Combivert drives can be integrated into higher-level control systems.

I would like to discuss in more detail why a frequency converter is needed. The main purpose is smooth (without delays) adjustment of the speed (frequency) of rotation of asynchronous or synchronous electric motors. This happens as a result of the transformation of a three-phase (or single-phase) voltage with a constant frequency and amplitude into a three-phase voltage with a variable frequency and amplitude.

Mechanical variators, hydraulic couplings, motor-generator systems, or electromechanical frequency converters can be used to regulate the rotation speeds of an asynchronous motor, but all these methods hide significant disadvantages, for example:

 - low quality and ephemerality;

 - uneconomical;

 - as a rule, a small adjustment range;

 - difficulty in operation and maintenance.

In the case of using frequency converters, the speed of rotation of the electric motor is regulated by changing the supply voltage and frequency. In this case, the efficiency of such a transformation is kept at about 98%, and computerized systems ensure high quality and accuracy of its work, as well as allow controlling a large number of parameters. Of course, in the event of an emergency, the micro-controller will turn off the power supply of the equipment and will not fail.

Recently, only two-stage converters can be found on the market. They got their name from the method of energy conversion. You can also find direct frequency converters.

But according to the method of controlling electric motors, they can be divided into two groups:

  - with scalar control;

  - with vector control.

Frequency converters make it possible to build complex control algorithms that allow, depending on the load on the electric motor, to optimize the operating mode, and also protect the motor from overload and voltage surges. The use of frequency converters with asynchronous motors is a promising and economically justified direction of changing both the adjustable direct current drive and the non-adjustable alternating current drive.

If you say - I am ready to buy a frequency converter from LBU-Tech, this means that you will get a significant saving of electricity, an increase in the service life of technological installations and equipment, a reduction in the cost of repairing electric motors and equipment connected to them, as well as some production automation. The main function that the frequency converter should perform is to regulate the speed of a synchronous or asynchronous three-phase electric motor.