Robots with large loads affect efficiency and stability reasons

Create Date: 2024-8-30 12:03:23|Source: Denso/DENSO

For traditional robots, it will be more difficult to control the robot with a large load, which greatly affects the efficiency and stability of the robot.

                              Robots with large loads affect efficiency and stability reasons

The main reasons for this are as follows:

(1) The traditional robot encoder is installed on the input side of the reducer, but the reducer has more or less backlash, and with the length of the arm span, the deviation of the end point caused by the backlash will also be enlarged.

(2) When the robot is in the low-speed area, when the static friction and dynamic friction torque are switched, the input shaft rotates at a constant speed, and the output shaft may show a fast and slow jumping movement, and the heavier the load, the positive pressure and friction will increase, and the "crawling" phenomenon will be more obvious.

(3) The torsional stiffness of the robot connecting rod section is constant, and with the lengthening of the arm span, the torsion angle of the end increases, which will reduce the resonant frequency of the entire mechanical transmission chain, and then affect the control bandwidth of the servo, and reduce the control performance and accuracy.

(4) In practical application, with the increase of inertia, the natural frequency of the system decreases, the response speed slows down, the stability deteriorates, and the overshoot becomes larger.

(5) The robot does not have active safety protection function.

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