Working principle and structural characteristics of brushless automatic control motor soft starter
1. Brushless Automatic Control Motor Soft Starter Introduction Brushless Automatic Control Motor Soft Starter is to install the starting resistor directly on the rotating shaft of the motor. The centrifugal force generated by the rotation of the motor is used as the power to control the size of the resistor to reduce the starting current of the motor and increase the starting. Torque, which enables the wound-type asynchronous motor to realize the brushless automatic control operation. It is installed on the AC motor as shown in Figure 1.
2. The working principle of the brushless automatic control motor soft starter The control principle of the brushless automatic control motor soft starter is as shown in the above figure. It is equivalent to the rotor series resistance of the wound AC asynchronous motor, namely:
The slip rate at S = r1/x1+x2 is defined as the critical slip rate Slj, and Slj is generally between 0.06-0.16. At this time, the torque of the motor is the maximum torque, and the motor current is the current at the start. 0.717 times is 5 times rated current; as the motor speed increases, S decreases, and the motor current and torque decrease. When S=Se (0.02
Starting torque: Mst=K1U12S/(rst+r2) where: K1=m1/Ω
Starting current: Ist= U1S/(rst+r2)
The above formula: As long as the motor starting current is constant, the starting torque of the motor can be kept constant; only the starting resistance rs changes with S according to a certain functional relationship to ensure that the starting current is substantially constant.
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