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 has significantly improved the power density of servo motors. Therefore, whether a servo motor needs to be paired with a speed reducer is primarily determined by application requirements and cost considerations.
1. 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.
2. Increased equipment lifespan: Planetary reducers can also effectively solve the problem of decreased low-speed control characteristics of motors. The controllability of servo motors decreases to some extent with reduced speed, especially noticeable in signal acquisition and current control stability at low speeds. Therefore, using a reducer allows the motor to achieve higher speeds.
3. 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 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 achieved, resulting in a saving of more than 50% in operating costs.