The advantage of is a continuous adjustment of the complete volume flow range over the speed. The unit can be controlled by a standardized signal (0-10V; 0-20mA or 4-20mA) or with a commercially available 10kOhm potentiometer. The direct installation on the motor completely eliminates the EMD problem, e.g. shielded cables are not required.
Yet another significant advantage is the operation with speeds in excess of 3000 rpm. As a result, smaller radial fans can be used to achieve operating profiles beyond their 50 Hz characteristic line.
However, when project-planning such applications, care must be taken that the motor output needs to be adjusted to the maximum output frequency of the inverter.