Volt/Hz = const. control
A common method to control the angular velocity of an electrical machine with a power inverter is to adjust the amplitude of the stator voltage to be in proportion to the speed of the rotor. This ensures a constant flux linkage distribution.
This technique is knows as ‘Volt/Hz = const. control’. It is an open-loop control method that does not require feedback signals such as the measured stator currents or the dc-link voltage of the power inverter.
A drawback of this method is that it is not resilient in the presence of disturbances. Moreover it cannot ensure high dynamic performance when the operating point of the drive system changes because, e.g. of an abrupt load torque step.















