A frequency converter is a device designed to convert fixed-frequency alternating current (AC) into direct current (DC). The DC voltage generated by the converter is then used to produce AC voltage with a variable frequency, which is required to power electric motors efficiently.
Medium-voltage frequency converters, often referred to as inverters, are devices powered by medium-voltage input and are capable of directly supplying medium-voltage motors—eliminating the need for intermediary equipment such as transformers. Their primary function is to convert voltage through an AC–DC–AC sequence and adjust the input to a smoothly regulated output frequency.
A typical medium-voltage inverter consists of four key components:
A soft starter is a device used to limit inrush current— the high surge of current that occurs when electrical equipment is first switched on.
Historically, soft start systems were built using passive resistive and inductive elements controlled by electromechanical switches. Today, they are based on microprocessor-controlled power electronics, offering more precise and reliable performance.
In practice, soft starters and medium-voltage frequency converters enable smooth motor startup. Additionally, devices such as frequency converters allow process control through variable drive speed. This reduces energy and maintenance costs, lowers the number of required components, and extends motor lifespan by minimizing wear.
The selection of a current-source inverter involves matching its parameters to both the power supply network and the rated parameters of the existing or newly designed motor. Inverters must be carefully matched to the system in a way that ensures maximum efficiency of the entire drive system while minimizing disturbances to the power supply network. Choosing the right cooling method for the inverter—based on the installation environment—is also essential.
Installation conditions, inverter location, and the distance to the motor are all important factors when selecting the optimal current-source inverter for your application.
Voltage-source inverters are widely used in industry, including in the design of electronic frequency converters. In consumer electronics, they are found in devices such as washing machines, mixers, grinders, and treadmills—where they control motor speed according to predefined formulas.
The cost of the inverter significantly influences the final price of the product or system in which it is installed.
We offer a wide range of high-quality solutions for powering electric motors from just a few kilowatts up to 20 MW, including advanced drive speed control. For this purpose, we provide some of the best technologies available on the market—soft starters and frequency converters for low and medium voltage applications from leading manufacturers such as:
Rockwell Automation, VACON, ABB, Danfoss, and Eaton.
In addition to the supply and integration of inverters and soft starters, we offer comprehensive service and support. Our offering includes warranty and post-warranty inverter service for equipment from Rockwell Automation, VACON, ABB, Danfoss, and Eaton.
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