YEJIn the actual application process of brake motor, there are many methods of speed change and speed regulation. Like the connection methods through different combinations of windings, you can get2,3,4A total of3Kind of speed. The speed change of this speed regulation method is different, and it is only suitable for some special applications, and can only achieve the purpose of large-scale coarse adjustment.
The speed regulation can be controlled by the rotor string resistance, which is only applicable to the winding rotor asynchronous motor. It changes the slip rate of the motor by changing the resistance value connected to the rotor circuit, so as to achieve the purpose of speed regulation. Because the resistance value of the external series resistor can be changed in multiple stages, a variety of speed regulation can be achieved. In principle, it can also achieve stepless speed regulation. However, because the connection resistance consumes power and is inefficient, the mechanical characteristics of this speed regulation method are soft, and it is only suitable for occasions where the speed regulation performance is not high.
Brake motorCascade speed regulation, this speed regulation method is only suitable for winding asynchronous motors. It feeds the slip power back into the power grid through certain electronic devices and uses it, and it is more widely used in fan and pump transmission systems.
YEJBrake motorVoltage regulation speed regulation, this method is to reverse and connect the thyristor to form a communication speed regulation circuit. By adjusting the trigger Angle of thyristor, the end voltage of asynchronous motor is changed to speed regulation. This method also changes the slip rate. The slip power is consumed in the rotor loop, the efficiency is low, and it is more suitable for special rotor motors(For example, deep-slot motors)Equal height slip motor. In general, this speed regulation method should constitute a closed loop of speed or voltage for practical application.
Electromagnetic speed regulation, transmission of mechanical power through electromagnetic coupling, transmission of electromagnetic coupler between the brake motor and the load electromagnetic coupler, can adjust the size of the slip rate, so as to achieve the purpose of speed regulation. Ac brake motor speed control system is simple in structure and cheap in price, which is suitable for simple adjustment system, but its slip power is consumed in the coupler, and the efficiency is low.
Ac brake motor variable frequency speed regulation, changing the power frequency can make the asynchronous motor get different synchronous speed, the use of variable frequency machine for asynchronous motor speed regulation method is rarely used, the current use of static inverter power supply. Semiconductor devices. At present, this speed regulation method has become the mainstream of AC speed regulation development.
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