Feedback Devices
Feedback devices are a class of device required for closed loop operation. They provide a signal back to the drive or motion controller to monitor an operation or process and verify that proper operation occurs. In Motion Control applications, there are two primary feedback devices: Resolvers and Encoders.
A resolver is an electromagnetic feedback device which converts angular shaft position into analog signals. These signals can be processed in various ways, such as with an RDC (resolver-to-digital converter) to produce digital position information. There are two basic types of resolvers; transmitter and receiver. A transmitter-type is designed for rotor primary excitation and stator secondary outputs.
Position is determined by the ratio of the sine output amplitude to cosine output amplitude. A receiver-type is designed for stator primary excitations and rotor secondary output. Position is determined by the phase shift between the rotor output signal and one of the primary excitation signals.
The most popular type of Feedback Device is the Encoder. An encoder is an electromechanical device for translating linear or rotary displacement into a corresponding series of digital signals or analog output voltage.
Incremental Vs. Absolute Encoders:
增量编码器
通过在光源和照片检测器之间通过的旋转盘产生电信号的装置。
增量编码器具有两个输出信号，或通道，通常称为通道A和B.A和B输出彼此彼此间隔为90º，并且由运动控制器解释以确定位置/速度信息。A和B信道之间的引线/滞后关系提供了方向信息。
重要的是要理解每个机械位置都没有唯一定义。当增量编码器通电时，不知道增量编码器的位置，因为输出信号不是任何奇异位置的唯一位置。增量编码器通常提供每次旋转磁盘脉冲一次的第三个输出。这通常称为索引或Z信道，并且通常用于归位/参考移动。
Absolute Encoders
Absolute encoders have a unique value (voltage, binary count, etc.) for each mechanical position.
When an absolute encoder is powered on, the position is known. Absolute encoders most commonly provide digital data in a parallel or serial format to the motion controller which is used to determine position/velocity information.
Since they provide absolute position information when powered on they eliminate the need for a homing/reference move in a motion system.
Electromate supplies feedback devices for optical & miniature encoders throughout Canada in regions like Ontario, British Columbia, and Quebec.
Encoders, Inclinometers, and Tachometers We Provide:
倾角计(Tilt Sensors)
Electromate proudly carries TILTIX Inclinometers made by Posital. Also called tilt sensors, they're designed to measure the angle of an object with respect to the force of gravity. These tilt or level meters determine pitch and/or roll angle and output these values via the appropriate electrical interface. Inclinometers are easy to integrate to an application, because there's no need for mechanical linkages aside from the installation itself. This is a real advantage for design engineers.
Draw Wire Encoders
电摩特提供Posital的Linarix绘制线传感器。它们通过使缠绕在线鼓周围的不锈钢丝来测量线性运动。滚筒通过联接器致动耦合到其上的旋转编码器。壳体中的导线由弹簧缩回。编码器提供比例输出。测量是准确可靠的。
Linear Encoders
Linear encoders sense and digitize linear position change for position measurement and feedback to control systems. Linear encoders are available in two types, absolute and incremental, as defined by their position signals. Absolute linear encoders create a unique position signal that is available anywhere along travel. The exact position will be read after power cycling. Incremental linear encoders do not generate a unique signal. The encoder is zeroed after power-down and relies on another switch or encoder for initial reference.
Rotary Encoders
旋转编码器,也称为轴角编码器s, are electromechanical devices that convert angular position or motion of a shaft to analog or digital output signals. Absolute encoders and battery backup incremental encoders provide precise and unambiguous measurements without losing track of their position due to a temporary loss of instrument power. Rotary encoders typically fall under one of three major mounting styles: hollow-shaft, hub-shaft, and shafted.
高真空编码器
来自Microe Systems的高真空编码器是具有小型真空额定传感器的增量编码器，用于在真空中操作的运动控制应用。由于它们的性能，体积小和高真空等级，Mercury™和Mercury II™真空编码器在各种应用中规定。从传感器中使用可编程数字输出，模拟输出或数字输出的模型进行选择，所有使用高达10-8torr的真空兼容材料构造。所有传感器都可以与线性，旋转和电弧段秤一起使用。
Linear Displacement Transducers
线性位移transducers are linear sensors that work on the magnetostrictive principle, whereby a torsional strain pulse is induced in a specially designed magnetostrictive waveguide by the momentary interaction of two magnetic fields. The interaction between these two magnetic fields (one from the moving magnet and one passing along the outside of the transducer) produces a strain pulse which travels at sonic speed along the sensor waveguide until the pulse is detected at the head of the transducer where the electronics are embedded.
DC Tachometers
直流转速表发电机提供了一种方便的方法，可以将转速转换成适合于远程监控和速度控制应用的隔离模拟电压信号。ToChometers特别适用于精密积分器和速度伺服应用，两者都需要与最小纹波的高线性速度/电压关系。几乎纯的直流输出 - 没有相位偏移 - 允许快速计用作快速响应伺服和其他设备的速度反馈传感器。Tach发生器也是低速位置伺服应用中的速度阻尼的优异速率发生器。
