Siemens servo motor maintenance can repair any fault without limitation

NegotiableUpdate on 03/02

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Overview

The replacement and maintenance of encoders by Shanghai Quli Automation Technology Co., Ltd. is a test of technical content in servo motor maintenance, as most imported spindle motors have non-standard communication formats. Early incremental products can be interchangeable with each other, but the new generation of products has formed their own different internal standards, with different manufacturers having different standard modes. In addition, the pulse density is too high, and there are different algorithms for encoder alignment, which makes it difficult for different brands of products to have commonalities and increases the difficulty of maintenance. Siemens servo motor maintenance can repair any fault without limitation

Product Details

Problem 2: Inertial matchingSiemens servo motor maintenance can repair any fault without limitation

Specifically manifested as:

1When selecting a servo system, in addition to considering factors such as motor torque and rated speed, we also need to first calculate the inertia of the mechanical system converted to the motor shaft, and then select the motor with the appropriate inertia size based on the actual action requirements of the machinery and the quality requirements of the machined parts;

2Correctly setting the inertia ratio parameter during debugging (in manual mode) is a prerequisite for fully utilizing the efficiency of mechanical and servo systems, which is particularly prominent in systems that require high speed and high precision (Delta servo inertia ratio parameter is 1-37, JL/JM). In this way, there is the problem of inertia matching.

What exactly is' inertia matching '?

1According to Newton's second law, the required torque T for a feed system is equal to the system's transmission inertia J multiplied by the angular acceleration θ

The angular acceleration θ affects the dynamic characteristics of the system. The smaller the θ, the longer it takes for the controller to issue instructions and the system to complete execution, resulting in slower system response. If θ changes, the system response will fluctuate rapidly, affecting the machining accuracy. Since the large output T value remains unchanged after selecting the motor, if we want the change in θ to be small, then J should be as small as possible.

2The total inertia of the feed axis "J=the rotational inertia momentum JM of the servo motor+the load inertia momentum JL converted from the motor axis

The load inertia JL is composed of the inertia of the worktable and the fixtures, workpieces, screws, couplings, and other linear and rotating moving parts installed on it (taking a machine tool as an example) converted to the inertia on the motor shaft. JM is the inertia of the servo motor rotor. Once the servo motor is selected, this value becomes a constant, while JL varies with changes in the load on the workpiece. If you want the rate of change of J to be smaller, then make the proportion of JL smaller. This is commonly known as' inertia matching '.

Knowing what inertia matching is, how can we determine the specific impact of inertia matching?

influence:

The transmission inertia has an impact on the accuracy, stability, and dynamic response of servo systems. A large inertia results in a large mechanical constant and slow response, which can cause a decrease in the natural frequency of the system and easily lead to resonance. This limits the servo bandwidth, affects servo accuracy and response speed. Increasing the inertia appropriately is only beneficial for improving low-speed crawling. Therefore, in mechanical design, the inertia should be minimized as much as possible without affecting the system stiffness.

determine:

When measuring the dynamic characteristics of a mechanical system, the smaller the inertia, the better the system's dynamic response; The larger the inertia, the greater the load on the motor and the more difficult it is to control, but the inertia of the mechanical system needs to match that of the motor. Different institutions have different choices for the principle of inertia matching and have different effects. For example, when a CNC center machine performs high-speed cutting through servo motors, as the load inertia increases, the following occurs:

(1)When the control command changes, it takes more time for the motor to reach the speed requirements of the new command;

(2)When the machine table performs rapid cutting along two axes in an arc curve, significant errors may occur:

①Under normal circumstances, when JL ≤ JM, the above problems will not occur for general servo motors

②When JL=3 × JM, the controllability of the motor will slightly decrease, but it will not affect normal metal cutting. (For high-speed curve cutting, it is generally recommended that JL ≤ JM)

③When JL ≥ 3 × JM, the controllability of the motor will significantly decrease, which is particularly prominent in high-speed curve cutting

Different mechanism actions and processing quality requirements have different requirements for the size relationship between JL and JM. The determination of inertia matching needs to be based on the process characteristics and processing quality requirements of the machinery.

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