Frequency converter (frequency converter, inverter) has become a standard way of controlling motors. Let's look at how it works and what problems it solves, in simple words.
Main principle
The speed of an asynchronous motor depends on the frequency of the supply current. In a regular network, the frequency is fixed - 50 Hz. The frequency converter changes the frequency (and voltage) at the output, which means it regulates the motor speed smoothly and over a wide range.
How this happens
- The converter rectifies the alternating current of the network into direct current.
- Then the inverter forms from it alternating current of the desired frequency.
- By changing the frequency, the inverter sets the engine speed.
What it gives frequency switch
| Feature | Benefit |
|---|---|
| Smooth start | No starting shocks or current surges |
| Speed regulation | Fine tuning to the task |
| Energy saving | For pumps and fans - significant |
| Motor protection | Built-in current and overload control |
Important nuances
Operation from a frequency generator has its own peculiarities: at low speeds cooling deteriorates, and pulse voltage loads the insulation. Therefore, for working with inverters, reinforced winding insulation is desirable. When rewind appropriate materials are used under the frequency generator. Read more about when you need a frequency converter - in a separate material.
Are you planning to install a frequency converter or repair a motor for an inverter in Tashkent? Elektromotors engineers will help - contact us.