Torque boost is mainly used to improve the characteristics of the torque low-frequency
under V/F control mode. If the torque boost is too low, the motor will work at the lower
speed and power. If the torque boost is too high, the motor will run with overexcitation, the
inverter's output current increases and the efficiency is reduced.
It is recommended to increase this parameter when the motor works with heavy load but
without enough torque. The torque boost can be reduced when the load is lighter. When the
torque boost is set to 0.0, the inverter will automatically perform torque boost, the inverter
can automatically calculates the required torque boost value according to the motor stator
resistance parameters.
Torque boost cutoff frequency: torque boost is valid below this frequency, invalid above
the set frequency.
F4.03 to F4.08 six parameters are used to define multi-point V/F curve.
The multi-point V/F curve is set according to the load characteristics of motor, please be
noted that the relationship between three voltage points and three frequency points must be
V1: Manual torque boost voltage Vb: Maximum output voltage
f1: Manual torque boost cut-off frequency fb: Rated operating frequency
Schematic diagram of manual torque boost voltage
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