The working principle of rotary encoder
Rotary encoder.
Rotary encoder in factory automation (FA) on the application has been a fairly long period of time, the most reprentative of is in the industry robot; robot manipulator with two shaft, also have multiple axis, but driving mechanical arm movements are motor on the robot structure, all of the mechanical arm action kinetic energy is the source of motor.Most of the FA and OA equipment main energy sources is also the motor; and the motor affected by different forms of control instruction.On the operation of the motor control mode are only in a certain period of time at a certain speed, but also have complicated and irregular operation, there are multiple shaft running at the same time, it formed a machinery equipment every kind of operation state.
Motor control is usually speed control and displacement (turning volume) control, control way is with the motor types is not the same as.For example, the stepper motor to move the control, in the control condition, the rotation angle (LAPS) is a real time control system puls
e synchronized changes, unless the out-of-step and other special circumstances, otherwi should be strictly synchronous mobile.In addition to the stepper motor, the other motor rotation detection, if there is no signal feedback to achieve preci control is very difficult.In conclusion, motor speed control, such as to control quantity, and feedback to the control circuit, the motor is maintained at a certain speed, or stop at a certain position.In general, this rotation by the rotary encoder to detect the amount of feedback.
The principle of photoelectric encoder
Photoelectric encoder, a photoelectric conversion of the mechanical axis output geometric displacement amount is converted into electrical puls or electronic digital quantity nsor.It is currently most ud nsors, photoelectric encoder is compod of grating disc and a photoelectric detection device.The grating disc is in a certain diameter circular plate uniformly provided fan transmission channel.
Due to the photoelectric encoder is coaxial with the motor, when the motor rotates, the grating disc and the motor synchronous rotation, the light emitting diodes and other electr
大晦日onic components of the detecting device detects the number of output pul signal, through the calculation in a certain period of time the number of output puls can reflect the current motor speed.In addition, in order to determine the direction of rotation, the encoder can also provide electrical pha difference of 90 degrees pul signal.
Incremental encoder
Incremental encoder is the direct u of photoelectric conversion principle three t of output square wave puld A, B and Z; A, B group of two pul pha difference of 90 degrees Z pha for each turn of a pul, for the datum point positioning.It has the advantages of simple principle, mechanical life expectancy in the tens of thousands of hours, strong anti-interference ability, high reliability, suitable for long distance transmission.Its disadvantage is the inability to rotation of the output shaft of the absolute position information.好用的防晒霜
原味蛋糕卷Solid shaft encoder type installation notes
• the encoder shaft and the ur end between the output shaft with elastic soft connection, in order to avoid ur shaft ries, beating caud damage and encoder encoder shaft.
初中好段摘抄大全
• when install the permitted axle load.
• should ensure that the encoder shaft and the output shaft axis of different urs of <0.20mm, and the axis angle <1.5 °.The installation is prohibited to percussion and knocking, so as not to damage the shafting and code
旋转编码器简介
旋转编码器在工厂自动化(FA)上的应用已经有相当长一段时间了，最具代表性的是在工业机器人；机器人机械臂有二轴的，也有多轴的，但是驱动机械臂动作的都是马达在机械人的构造中，所有机械臂动作的动能来源是马达。大部份的FA土地买卖合同协议书及OA设备的主要动能来源也是马达；并且马达受到不同指令形式地控制。对马达运行的控制方式有只在某一段时间内以一定的速度运行，也有复杂而不规则的运行，还有多轴同时运行等，这样形成了机械设备各式各样的运行状态。
怎么调整生物钟 对马达的控制通常是速度控制和位移量(特别喜爱的英语选转量)控制，控制方式是随着马达的种类不尽相同。例如步进电机的移动控制，在开环控制状态下，其转动角度(圈数)是随控制脉冲数而同步变化，除非失步等特别的情况，否则应该可以严格同步移动。除步进电机外，其他电机的旋转量检测，如果没有信号反馈要达到精密控制是非常困难的。总之，电机转速的快慢控制，如能以控制量表示，并反馈至控制电路，使电机维持在一定的速度，或停止在一定的位置。一般而言，此旋转反馈量由旋转编码器来检测。
光电编码器原理
光电编码器，是一种通过光电转换将输出轴上的机械几何位移量转换成电脉冲或电子数字量的传感器。这是目前应用最多的传感器，光电编码器是由光栅盘和光电检测等装置组成。光栅盘是在一定直径的圆板上均匀地开设扇形透光通道。
由于光电编码器与电动机同轴，电动机旋转时，光栅盘与电动机同步旋转，经发光二极管等电子元件组成的检测装置检测输出若干脉冲信号，通过计算在一定时间内的输出脉冲的个数就能反映当前电动机的转速。此外，为判断旋转方向，编码器还可提供电气相位相差90度的脉冲信号。
