Linear encoders in linear motors, this time in the forum, see the most is the linear motor does not need grating scale? Linear motor grating scales are used? How accurate is the linear scale of a linear motor? And so on, a series of questions centered on linear motors and grating scales, today Tongmao Xiaobian talked about linear motor and linear scales.
The linear encoder we often call is also called a position encoder and consists of a readhead and a scale. Raster encoders are commonly used position and speed sensors and are often used as feedback components in motion servo systems. The accuracy of the grating encoder has a crucial role to the performance of the system.
Raster encoders have round and straight lines, circles are called encoders, and linear encoders are called linear scales. According to the requirements, choose the appropriate grating.
Linear grating encoders, when selected, mainly select resolution, maximum operating speed, and accuracy. Among them, there are metal gratings and glass scales, metal gratings, there is no limit to the length, there is a certain degree of bending, easy to install. Glass scales do not have the advantages of unlimited length and bendable metal scales, but glass scales are superior to metal in accuracy.
The grating scale is a high-precision linear displacement sensor composed of a light source, a condenser lens, a scale grating, an indicator grating, and a silicon photocell. The scale is the most used measuring device in the closed loop control system of CNC machine tools. The grating ruler is usually used with two grating gauges of different lengths and lengths. The long one is called the main grating or scale grating. It is installed on the moving part of the machine tool and requires the same length as the stroke. The short one is called the indicator grating, indicating the grating and The light source, lens, and photo sensor are mounted on the fixed part of the machine.
The precise positioning platform composed of a linear motor and a grating ruler measuring system is widely used in CNC machine tools because of its high positioning and good stability. The linear motor has the advantages of high acceleration and deceleration, small dynamic inertia, high sensitivity, high system rigidity, and the grating ruler is a measuring device in a closed-loop control system. Linear motor generally according to the accuracy required by the organization, with the appropriate choice of grating ruler to form a closed-loop feedback, the accuracy of the linear motor and grating rule roughly determines the positioning accuracy of the entire system. The grating scale is just a feedback system. For example, a stepping motor and a ball screw platform can also add a grating scale as feedback. Linear motor, voice coil motor This must be feedback with a grating ruler. In order to realize full-closed loop, after using a servo motor, a scale is also added to the mechanism. Generally, the motor is selected. According to the accuracy required by the organization, a closed loop feedback is formed by selecting an appropriate scale. Want to learn more about linear motor information, please contact us: 400-007-7724
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Linear motor