Many customers are reflected in the servo motor system selection and debugging, often encounter inertia! So what exactly is the "inertia match"?

1. According to Newton's second law: "Feed system required torque T = system transmission inertia J × angle acceleration θ angle acceleration θ affect the dynamic characteristics of the system, the smaller the θ, the controller issued instructions to the system to complete the implementation of the time The longer the system response, the slower the response of the system. If θ changes, the system response will be slow and slow, affecting the machining accuracy. Since the maximum output T value after the motor is select, if the change of θ is small, J should be as small as possible.

2. The total inertia of the feed axis "J = the rotational inertia of the servo motor Momentum JM + The load inertia momentum of the motor shaft JL Load inertia JL From (for example, machine tool) The table and the fixture and workpiece, screw, Coupling and other linear and rotary motion parts inertia equivalent to the inertia of the motor shaft composition.JM for the servo motor rotor inertia, servo motor select, this value is set, and JL with the workpiece and other load changes If you want to change the rate of J smaller, it is best to make the proportion of JL smaller. This is the popular sense of "inertia matching."

Know what is the inertia of the match, analysis of the occurrence of this phenomenon is:

1 in the servo system selection, in addition to considering the motor torque and rated speed and so on factors, we also need to calculate the mechanical system to calculate the inertia of the conversion to the motor shaft, and then according to the actual mechanical requirements and processing quality requirements Specifically select the motor with the appropriate inertia size;

2 in the debugging (manual mode), the correct set of inertia than the parameters of the mechanical and servo system is to give full play to the best performance of the problem, this point in the requirements of high-speed high-precision system performance by the prominent (servo inertia ratio parameter 1-37, JL / JM). In this way, there is a problem with inertia matching!