The grating reticle of the linear encoder or the angle encoder is lithographically engraved on the glass or steel strip substrate. The scribe line pitch is extremely small and the edges are clear and uniform. With non-contact photoelectric single-field scanning technology and high-quality signal processing circuits, linear encoders and angle encoders provide high-quality signals with high precision, high resolution and small subdivision error for direct drive systems. Sensitive (in the pressure map, the red area is pollution), the final measurement of the drive system position measurement accuracy, speed stability and relatively constant temperature to ensure smooth operation of the system. The effect of subdivision error on direct drive After the measurement component obtains two position signals with a phase difference of 90° using incremental or absolute measurement methods, further subdivision is required to achieve the desired resolution. The actual output position signal will deviate from the ideal sinusoidal signal due to scanning methods, contamination, and subsequent electronic processing. When subdivided, this deviation produces periodic high frequency errors in one signal period, ie errors or subdivision errors in a single signal period. The subdivision error depends on the signal period, reticle quality and scan quality of the measurement component. At present, the position measurement component using photoelectric single-field scanning can limit the subdivision error to about 1% of the signal period, for example, a linear encoder with a signal period of 20 μm, and the subdivision error is 0.2 μm. The subdivision error not only affects the positioning accuracy of the direct drive system, but also affects the stability of the speed control loop. The speed control loop of the control system calculates the operating current of the drive system according to the positioning error of the feed system, and then controls the linear motor or the torque motor to perform acceleration and deceleration. When the feed rate of the CNC machine is low, the feed system follows the subdivision error. The direct drive system has a large control bandwidth due to high gain, and is greatly affected by the subdivision error in a large speed range. When milling the workpiece, due to the influence of the subdivision error, there will be corrugated processing marks on the surface of the workpiece, which seriously affects the surface quality of the workpiece, as shown in Figure 3. In general, the wavelength and amplitude of the corrugated trace are proportional to the subdivision error. Due to the subdivision error, additional current is generated inside the directly driven motor, which generates additional heat and noise. The larger the subdivision error and the motor feed rate, the greater the heat and noise of the motor. In addition, when the control system obtains the position value from the measuring component, if the position signal resolution is close to the subdivision error, the subdivision error will be recognized as the motion error of the machine tool feed system, and the control system will randomly send to the feed system. Compensation signal. This causes the control system to oscillate, and the moving parts of the machine such as the guide rail of the linear motor reciprocate at high frequency for a long time, thereby accelerating wear and reducing the service life. Dynamic characteristics of direct drive systems The direct drive system has good dynamic characteristics and often has high-speed, high-acceleration feed motion, which requires the measurement system to have good signal quality, high electrical movement speed and excellent anti-vibration and anti-shock performance. The photoelectric single-field scanning linear encoder and angle encoder have high signal quality, and the non-contact measurement between the grating reticle and the readhead makes it wear-free, and has good anti-vibration and anti-shock performance, and the electric movement speed can reach 180 m. /min. In summary, for the application characteristics of the direct drive system, the photoelectric single-field scanning linear encoder and angle encoder provide high-precision, high-resolution, small subdivision error quality for its position control loop and speed control loop. The signal ensures efficient and smooth operation of the drive system, and finally enables high-speed, high-precision, high-surface quality and high-stability processing. Previous page Refractory Brick products are usually divided into two types: unshaped Refractory Materials and stereotyped refractory materials . Refractory Brick Fireproofing Tile,Grog Brick,Chamotte Brick Zhengzhou YuXin Kiln Engineering Co.,Ltd. ,
Linear encoder/angle encoder for direct drive
Not stereotypes refractories also called castable, is one of kind mixed powder material made from a variety of aggregate or aggregate and one or more binding agent , it is necessary to use mixed with one or more kind of the liquid , with strong liquidity .
Fixed refractory material: usually refractory brick, its shape has standard rules, also can be built according to need to be made temporary processing.
Main Features:
1, high temperature resistant
2. Large density, heavy volume, large strength and high thermal conductivity
3 shock resistance, anti-bending strength and high compressive strength
4 wear resistance, thermal conductivity, impact resistance, slag resistance