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Speed regulation method of three-phase asynchronous motor

Speed regulation method of three-phase asynchronous motor

Speed regulation method of three-phase asynchronous motor

Compared with the DC motor, the AC motor eliminates the commutator, making the structure simpler, stronger and more compact. It has the characteristics of small maintenance workload, high operating efficiency, small moment of inertia and fast dynamic response. In the past, due to the lack of corresponding control means, it was difficult to adjust the speed. Therefore, in most of the 20th century, AC motors were mainly used in the case of no speed regulation. In recent years, due to the rapid development of power electronics and microelectronics technology, the continuous introduction of new devices and new control systems has enabled AC electric drives to have the same excellent speed control performance as DC electric drives, resulting in rapid AC speed regulation. development of. The formula of the speed of the three-phase asynchronous motor is: n=n1(1-s)=60f1p(1-s) It can be seen from the above formula that changing the power supply frequency f1, the pole pair p of the motor and the slip rate s can all change the speed the goal of. From the nature of speed regulation, different speed regulation methods are nothing more than changing the synchronous speed n1 of the AC motor or not changing the synchronous speed n1. Specifically, the speed regulation of the three-phase asynchronous motor mainly includes the following method. The winding type resistance of the wound-type motor is controlled by the winding-type asynchronous motor. The rotor is inserted into the additional resistor to increase the slip of the motor and the motor is lower. Run at the speed. The greater the resistance in series, the lower the speed of the motor. The method is simple in equipment and convenient in control, but the slip power is consumed in the form of heat on the resistor. It has a graded speed regulation and soft mechanical characteristics.

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