Weihai Jinba motor tells you the principle of motor Buck start

During the Starting Process of the motor, you only need to ensure that the acceleration torque is greater than 0. It is not necessary to start the motor at the rated voltage. For details, see the analysis below. Motor Buck start is to avoid high starting torque and starting current peak, reduce the Motor Starting Process of the acceleration torque and impact current on the working machinery, power supply system. The starting process of the motor is a process in which the rotation speed increases gradually. In order to ensure that the motor can fully accelerate to the rated speed, the torque value of the motor must be greater than the torque value of the load during the whole acceleration phase, otherwise the speed of the motor will stop because it does not go up. The difference between the motor torque and the load torque is called the acceleration torque. It must always be greater than zero throughout the acceleration phase. The torque value of the motor is proportional to the square of the voltage added to the Stator Winding End (M ~ U2), the stator current value of the motor is proportional to the stator end voltage (I ~ U). So we can reduce the starting torque and starting current by reducing the voltage (to ensure the acceleration torque is greater than 0.

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