The starting torque is adjusted to improve the low speed performance of the inverter when starting, so that the torque output by the motor can meet the requirements of production start.
Torque boost = 0HZ output voltage / rated output voltage × 100%
In the asynchronous motor variable frequency speed control system, the torque control is more complicated. In the low frequency band, the influence of resistance and leakage reactance cannot be ignored. If the V factory is kept constant, the magnetic flux will decrease, which will reduce the output torque of the motor. For this reason, the voltage is appropriately compensated at the low frequency band to increase the torque. However, the influence of leakage impedance is not only related to frequency, but also related to the magnitude of motor current. Accurate compensation is very difficult. In recent years, some inverters that can compensate for themselves have been developed abroad, but the calculation amount is large, and the hardware and software are complicated. Therefore, the general inverters are manually set and compensated by the user. For the inverter we use, it is appropriate to set the torque boost to between 1% and 5%.
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