What is the rotary encoder?

The rotary encoder, also referred to as the shaft encoder, is a sensor that generates an electrical signal in response to a rotary movement. This signal is used to determine or check the speed or position of the mechanical device. The rotary encoder is mounted on a cylindrical shaft and is often used in combination with mechanical conversion devices such as linear slides and stands and pinion, to measure linear movement. Rotary encoders are used on a wide range of accurate devices that require closely control over position or speed, including medical devices, robotics, assembly machines and testing equipment. The incremental encoder generates a number of pulses or counts when it turns. Its output is measured in the pulses of the revolution and these pulses are used to measure speed or monitor position. The absolute encoder generates an output signal that is in digital pieces, each bit corresponding to the known Positiina. As a result, the absolute encoder can be used directly to indicate the real poloHy.

The primary components of the rotary encoder are disk, sensor and electronics. The disk contains a pattern of fine lines on its surface or outer teeth machined on the outer diameter. The sensor is mounted in close proximity to the disk and reads rows or teeth. The electronics consists of an output device that receives a signal from the sensor and converts it to a usable signal that provides speed and feedback. The disk, sensor and electronics are mounted inside the housing, with the only cable from the housing that electrically connects the encoder with other devices.

The rotary encoder can use optical or magnetically technology. The optical encoder uses a light emitting diode that shines light through a thin glass disk with a pattern of fine lines on its capacity. The light passes through the glass disk and the photo detector receives a signal and creates an electrical output. The magnetic encoder uses the Magneto resistantThe sensor that can detect changes in the magnetic field when the patterned disc turns. These changes correspond to different angular positions as the disk moves.

rotary encoders are available in many sizes, with different levels of resolution and with special features such as indicator lights, own drives and improved electronics. The choice of the right encoder for a particular application depends primarily on the speed of rotation, the required measurement accuracy and the use of the environment. The optical rotation encoder is most often used in applications where high operating speeds and resolution are required. The magnetic sensing encoder is more resistant to environmental factors such as dust, moisture, vibration and mechanical shock, and is usually used for robust applications.