Frequency converters from popular manufacturers
Among the most well-known brands producing frequency converters, the following can be highlighted:
These manufacturers offer high-quality frequency converters, which have become the foundation for the automation of technological processes. Recently developed new technologies in the field of frequency-controlled drives fully meet the modern requirements for the evolution and transformation of the global market of drive mechanisms. The main advantages of these devices include:
- Wide capabilities, including various configuration options.
- Energy efficiency.
- Ease of operation and maintenance.
Selecting a frequency converter
Choosing a frequency converter, like any other high-tech equipment, requires a careful approach. It is necessary to consider the following characteristics:
- Type of frequency converter.
- Functional capabilities.
- Overall suitability for use.
Main stages of frequency converter operation
A frequency converter consists of three main stages for controlling an electric motor:
- Rectifier stage: Uses a solid-state rectifier based on a power diode to convert 50 Hz alternating current from the power grid (220 or 380 V) into direct voltage.
- Inverter stage: Power electronic switches, such as IGBT, rapidly turn on and off direct current supply from the rectifier, providing the necessary output frequency.
- Control system: Manages the output voltage and vector of voltage applied to the electric motor, maintaining the required ratio of voltage and frequency.
Modern frequency converters are often equipped with PWM regulation, which allows reducing harmonic losses by approximating the output waveform to a sine wave.
Types of frequency converters
There are two main types of frequency converters:
- Converters with a pronounced direct current link.
- Converters with direct connection.
The first type is typically used for electric motors, while the second provides higher efficiency and the capability to operate at high voltages and currents.
Each of these types has its own features, advantages, and disadvantages, and the correct choice depends on the specifics of the particular application.