VHzkontroll
VHzkontroll is a method of controlling alternating-current motors, commonly used in variable-frequency drives. The term combines V for voltage and Hz for frequency, reflecting the central rule of the strategy: keep the supply voltage proportional to the applied frequency to maintain approximately constant motor flux.
In practice, the controller adjusts the output voltage as the frequency changes. Below a base frequency, voltage
VHzkontroll can be implemented in open-loop form, which does not rely on speed feedback, or in closed-loop
Applications include industrial drives for pumps, fans, conveyors, and other non-critical loads where smooth torque delivery
Related topics include variable-frequency drives, V/f control, induction motors, and broader electric motor control techniques.