How to locate the precision of linear motor
time£º2017/7/7 click£º20611
Linear motor, according to the precision required by the mechanism, combined with the selection of suitable grating rulers to form closed-loop feedback, the accuracy of linear motor and grid ruler roughly determines the positioning accuracy of the entire system.
The grating encoder is a commonly used position and speed sensor and is often used as a feedback element in a motion servo system. The precision of the grating encoder plays an important role in the performance of the system.
Raster encoder, round and straight, circular called code plate, linear called raster. According to the requirements, select the appropriate grating.
Linear grating encoder, when selected, is mainly to select resolution, large operating speed, precision. There are also metal gratings and glass raster rulers, metal raster rulers, no limit in length, curvature, easy to install. The glass grating ruler does not have the advantages of unlimited length and bending like a metal grating ruler, but the glass grating ruler is superior to metal in accuracy.
The raster is a high precision linear displacement sensor composed of light source, condenser, ruler grating, indicator grating and Silicon photocell. The raster is a measuring device used in the closed-loop control system of CNC machine tool. The raster ruler is usually used with two raster rulers of different lengths. The long one is called the main raster or ruler grating. It is installed on the moving part of the machine tool and requires the length of the rain stroke. The short one is called the indicator grating. The indicator grating and light source, lens, photosensitive elements are installed in the grass temple head and are installed on the fixed parts of the machine tool.
The linear motor has the advantages of high acceleration and high deceleration, small distance inertia, high sensitivity, and high system stiffness. The raster is a measurement device in the closed-loop control system. The grid is just a feedback system. For example, stepping motors and ball screw platforms can also be added to the grid ruler as feedback. Linear motor, coil motor. It's got to be fed back with a raster. In order to achieve full closed-loop, sometimes the servo motor is used, and the light grid is also added to the mechanism. Generally, the motor is selected, according to the precision required by the mechanism, with the selection of the appropriate grating ruler to form closed-loop feedback.
The emergence of linear Motors has been more than 100 years old, but it has not been widely used in industrial production until the past 20 to 30 years. It has replaced traditional motors to produce linear motion in terms of computers, automation, and precision linear displacement. trend. The accurate positioning platform composed of linear motor and raster measurement system has high positioning and stability and is widely used in CNC machine tools. We believe that the linear motor will replace the traditional ball rod transmission mechanism and develop greatly in the machine tool processing field.
Kunshan Tongmao Electronics Co., Ltd. is a professional R&D and manufacturer of high-performance, high-quality linear and swing motion solutions. Its main products are linear Motors, coil motors and high-precision linear platforms. Our self-developed and produced high-precision straight line platform has been recognized and recognized by many large customers at home and abroad. The company will make unremitting efforts to promote the development of China's industrial drive industry, committed to become a reliable supplier of direct line motor manufacturers, and continue to create value for customers.
For more information about linear Motors, please log on to Tongmao website www.tmemotion.com.
Linear motor