Application of servo motor and planetary reducer in welding equipment

In the application of modern industrial equipment, with the development of servo motor technology in high-precision applications, from high torque density to high power density, the speed increase is higher than 3000rpm. Due to the increase in speed, the power density of the servo motor is greatly improved. This means that whether the servo motor needs to be equipped with a reducer, the main factor is to examine the needs of the application and the consideration of cost.

However, what kind of application needs to deploy the servo planetary gear reducer?

1. High precision for heavy loads: This is required when the load needs to be moved and precise positioning is required. Generally such as medical, military technology, wafer equipment, robots and other automation equipment. Their common feature is that the torque required to move the load often far exceeds the torque capacity of the servo motor itself. This problem can be effectively solved by increasing the output torque of the servo motor through the reducer.

2. Increase the torque: The method of increasing the output torque can be used to directly increase the output torque of the servo motor, but this method not only requires the use of a high-power servo motor, but also has a stronger structure for the motor. It is greatly proportional to the increase of control current. At this moment, the use of relatively large drivers and the increase in the specifications of power electronic components and related electromechanical equipment will greatly increase the cost of the control system.

3. Enhance the efficiency of use: In theory, increasing the power of the servo motor is also a method of increasing the output torque. By increasing the speed of the servo motor twice, the power density of the servo system can be doubled, and there is no need to add a control system such as a driver. Specifications of components, that is, no additional cost is added. And this needs to achieve the purpose of increasing the torque through the deployment of the planetary reducer. Therefore, the development of high-power servo motors requires the deployment and use of reducers, rather than omitting them.

4、提高运用性能：据了解，负载惯量的不当匹配，是伺服操控不稳定的大原因之一。关于大的负载惯量，可以利用减速比的平方反比来调配佳的等效负载惯量，以获得好的操控呼应。所以从这个角度来看，行星减速机为伺服运用的操控响应的匹配。

5、增加设备运用寿命：行星减速机还可有用处理马达低速操控特性的衰减。由于伺服马达的操控性会由于速度的降低，导致产生某程度上的衰减，尤其在关于低转速下的讯号和电流操控的稳定性上，特别简单看出。因而，选用减速机能使马达具有较高转速。

6、降低设备本钱：从成本观念，假设0.4KW的AC伺服马达调配驱动器，需消耗一单位设备本钱，以5KW的AC伺服马达调配驱动器需要消耗 15单位本钱，但是若选用0.4KW伺服马达与驱动器，调配一组减速机就可以到达前述消耗15个单位本钱才能完结的事，在操作本钱上节约50%以上。

因而运用者依其加工需求不同，决议选用的行星齿轮减速机产品。一般来说，在机台运转上有低速、高扭矩、高功率密度场合需求，大部分选用行星齿轮减速机。