反馈设备
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
A device that generates electrical signals by means of a rotating disk that passes between a light source and photo detectors.
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。
It is important to understand that each mechanical position is not uniquely defined. When the incremental encoder is powered on, the position of an incremental encoder is not known, since the output signals are not unique to any singular position. Incremental encoders often provide a third output that pulses once per revolution of the disk. This is typically called the Index, or Z-channel, and is commonly used for homing/reference moves.
Absolute Encoders
Absolute encoders have a unique value (voltage, binary count, etc.) for each mechanical position.
当绝对编码器通电时，该位置是已知的。绝对编码器最常提供以并行或串行格式的数字数据，该运动控制器用于确定位置/速度信息。
由于它们在电源上提供绝对位置信息，因此消除了在运动系统中的归位/参考移动的需要。
电气为在安大略省，不列颠哥伦比亚省和魁北克等地区，在加拿大各地的光学和微型编码器提供反馈设备。
Encoders, Inclinometers, and Tachometers We Provide:
倾斜器（倾斜传感器）
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.
绘制电线编码器
Electromate offers POSITAL’s LINARIX draw wire sensors. They measure linear motion by displacing a stainless-steel wire wound around a wire drum. The drum actuates the rotary encoder coupled to it via a coupling. The wire in the housing is retracted by a spring. A proportional output is provided by the encoder. Measurements are accurate and reliable.
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，也称为轴编码器，是机电装置，其将轴的角位置或运动转换为模拟或数字输出信号。绝对编码器和电池备用增量编码器提供精确和明确的测量，而不会因暂时的仪器电源而丢失其位置。旋转式编码器通常落在三个主要安装风格中的一个：中空轴，轮毂轴和轴上。
高真空编码器
高真空编码器from MicroE Systems are incremental encoders with small vacuum-rated sensors for motion control applications operated in a vacuum. Mercury™ and Mercury II™ vacuum encoders are specified in a wide range of applications due to their combination of performance, small size, and high vacuum rating. Choose from models with programmable digital output, analog output, or digital output right from the sensor, all constructed using vacuum-compatible materials rated up to 10-8torr. All sensors can be used with linear, rotary and arc segment scales.
线性位移传感器
线性位移换能器是在磁致伸缩原理上工作的线性传感器，由此通过两个磁场的瞬时相互作用在特定设计的磁致伸缩波导中诱导扭转应变脉冲。这两个磁场之间的相互作用（来自移动磁体的相互作用和沿换能器的外侧的一个）产生应变脉冲，该应变脉冲沿着传感器波导在声速下行进，直到电子设备的换能器头部检测到脉冲。嵌入式。
DC Tachometers
DC tachometer generators provide a convenient means of converting rotational speed into an isolated analog voltage signal suitable for remote monitoring and velocity control applications. Tachometers are particularly suited in precision integrator and velocity servo applications, both of which require a highly linear speed/voltage relationship with minimum ripple. The nearly pure dc output-with no phase shift-allows tachometers to be used as velocity feedback transducers for fast-response servos and other devices. Tach generators are also excellent rate generators for velocity damping in low speed position servo applications.
