In modern industrial equipment applications, with the development of servo motor technology, high-precision applications have seen advancements in torque density and even power density, resulting in speeds exceeding 3000 rpm. This increased speed leads to a significant improvement in the power density of servo motors. Therefore, whether a servo motor needs to be paired with a gearbox depends primarily on the application requirements and cost considerations. For example, the following applications require a servo planetary gearbox.
1. Heavy-duty and high-precision: This is necessary when the load must be moved and precise positioning is required. This is commonly seen in automated equipment in fields such as aerospace, satellite, medical, military technology, wafer fabrication, and robotics. A common characteristic of these applications 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 using a speed reducer to increase the output torque of the servo motor.
2. Increase torque: One way to increase output torque is to directly increase the output torque of the servo motor. However, this method requires not only an expensive, high-power servo motor, but also a more robust structure. The increase in torque is proportional to the increase in control current. This requires a larger driver, and the increased specifications of power electronic components and related electromechanical equipment will significantly increase the cost of the control system.
3. Improved Performance: It is understood that improper matching of load inertia is one of the biggest causes of servo control instability. For large load inertia, the inverse square of the reduction ratio can be used to adjust the optimal equivalent load inertia to obtain the best control response. Therefore, from this perspective, planetary gearboxes offer the best matching for control response in servo applications.
4. Reduce equipment costs: From a cost perspective, assuming a 0.4KW AC servo motor with a driver requires one unit of equipment cost, a 5KW AC servo motor with a servo driver would require 15 units of cost. However, if a 0.4KW servo motor and driver are used with a set of reducers, the same thing that would have cost 15 units of cost can be accomplished, saving more than 50% in operating costs.
Therefore, users can choose planetary gear reducers with different installation methods according to their different processing needs. Generally speaking, planetary gear reducers are mostly used in applications requiring low speed, high torque, and high power density in machine operation.
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