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Detailed explanation of the reason for stepper motor positioned inaccurately

Categories: Latest NewsRelease time: 2017-09-20 15:20:00
Source: ZHAOWEIEditor: ZHAOWEI Author: ZHAOWEI

We all know that stepper motor open-loop control system will be more convenient to operate, and the price is cheaper, so we basically choose open-loop control reactive stepper motor in China. Although the stepper motor is widely used, it can not be used as a conventional cross-flow motor under normal conditions. From the start point to the end of the running speed In the theoretical situation, the motor limit starting frequency is greater than the speed of operation, the motor can run as required, and can achieve the desired speed. Run to the end of the trip, you can immediately send a stop function can be achieved pulse, and the motor to stop running. But the actual situation is that the stepper motor can achieve the minimum starting probability is low, far from meeting the requirements of higher operating speed. In this work condition, the motor is forced to start directly at the required speed (greater than the limit start rate), and a "lost step" or no response occurs.nthis work condition, the motor is forced to start directly at the required speed (greater than the limit start rate), and a "lost step" or no response occurs. And when the motor runs to the end, although it has been immediately stop the pulse, so that it stops, but due to inertia, will occur through the end of the phenomenon, that is, overshoot.

Due to inertia caused by overshoot phenomenon and the emergence of stepper motor positioning is not accurate The main reasons are the following:
    (1)Require the stepper motor to start the beginning of the high speed, far more than the stepper motor limit starting frequency, or that the acceleration is too large, resulting in "plunge" situation;
    (2)The power of the machine motor can not meet the requirements of the system;
    (3)Stepper motor in the course of work may be subject to interference caused by motor positioning are not allowed;
    (4)The controller of the control system generates a faulty action;
    (5)When the commutation is lost, the one - way operation is accurate and the deviation is changed after the commutation, and the deviation value is more obvious as the number of commutation increases.
    (6)Software design flaw;

What we need to pay special attention to the problem is in order to ensure the positioning accuracy of the system and get a higher positioning speed, the mainstream system will be divided into two stages of positioning process. Respectively: coarse positioning stage and fine positioning stage. According to the experience of production practice, "lost step" and "overshoot" is the stepper motor in the operation of the two most serious impact on stepper motor positioning accuracy of the "culprit."

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