Torque boosting is a parameter frequently used in inverters at low frequencies. Torque boosting refers to increasing the motor torque and inverter output voltage by adding an extra DC component when the current torque is insufficient, thereby increasing the load capacity. Generally, inverters can achieve an increase of approximately 0%-20%.
Because of the traditional V/F control method, the output torque of an OUKO frequency converter is directly proportional to the frequency. Generally, at low frequencies, the torque boost function essentially increases the internal voltage of the frequency converter, thus increasing the current and boosting the output torque. When using this function, the torque boost setting should not be blindly increased, as this will trigger overcurrent protection.
When operating in the low-frequency range, the excitation voltage of the motor decreases, resulting in underexcitation. The automatic torque boost function of the OKE inverter compensates for the underexcitation of the motor and enhances the torque of the motor when running at low speed (enhanced U/f characteristics).
Manual torque boosting diagram
