The asynchronous generator works in the braking mode: the rotor rotates in the same direction as the stator, but its speed is initially higher. The rotational speed of the magnetic field always remains unchanged and only the rotor speed can be controlled. Such generators are not vulnerable to short circuits and are well protected against external influences (dust, low temperature, moisture, etc.).

The disadvantages of the asynchronous generator can be called the mandatory presence of capacitors and the dependence of the output current frequency on the stability of the diesel or petrol engine. At the same time, the cost of such a device is lower than synchronous, but it is used less often. Asynchronous generators are recommended for connection of devices that do not require high starting voltage and are resistant to voltage fluctuations.