一、可调的转矩极限

One, adjustable torque limit 

通过变频调速后，能够设置相应的转矩极限来保护机械不致损坏，从而保证工艺过程的连续性和产品的可靠性。目前的变频技术使得不仅转矩极限可调，甚至转矩的控制精度都能达到3％～5％左右。在工频状态下，电机只能通过检测电流值或热保护来进行控制，而无法像在变频控制一样设置精确的转矩值来动作。

By adjusting the frequency conversion, the corresponding torque limit can be set up to protect the machine from damage, thus ensuring the continuity of the process and the reliability of the product. The current frequency conversion technology enables the torque limit to be adjusted, and even the torque control precision can range from 3 to 5 percent. In the condition of power frequency, the motor can only by measuring current value or thermal protection to control, not like in the frequency conversion control set accurate torque values to action. 

二、受控的停止方式

Two, controlled stop mode 

如同可控的加速一样, 在变频调速中, 停止方式可以受控，并且有不同的停止方式可以选择(减速停车、自由停车、减速停车＋直流制动)，同样它能减少对机械部件和电机的冲击，从而使整个系统更加可靠，寿命也会相应增加。

As controllable speed, in the frequency control of motor speed, stop mode can be controlled, and there are different ways of stopping can choose (slow parking, free parking, and stop + dc brake), also it can reduce the impact on the mechanical parts and motor, which makes the system more reliable, life will also be increased accordingly. 

三、节能

Three, the energy conservation 

变频器节能主要表现在风机、水泵的应用上。为了保证生产的可靠性，各种生产机械在设计配用动力驱动时，都留有一定的富余量。当电机不能在满负荷下运行时，除达到动力驱动要求外，多余的力矩增加了有功功率的消耗，造成电能的浪费。风机、泵类等设备传统的调速方法是通过调节入口或出口的挡板、阀门开度来调节给风量和给水量，其输入功率大，且大量的能源消耗在挡板、阀门的截流过程中。当使用变频调速时，如果流量要求减小，通过降低泵或风机的转速即可满足要求。

The energy efficiency of inverter is mainly applied to the application of fan and pump. In order to ensure the reliability of production, all kinds of production machines have a certain amount of surplus in the design of power drive. When the motor is not operating under full load, the excess torque increases the consumption of reactive power, resulting in waste of power, except to achieve the power drive requirement. Fan and pump equipment such as the traditional speed regulation method is by adjusting the barrier of entry or exit, the valve opening to adjust to the air and water, the input power is big, and large amounts of energy consumption on baffle and valve closure process. When using frequency conversion speed regulation, if the flow requirement is reduced, the speed of the pump or fan can be reduced to meet the requirement.