German ESSA encoder ESSA model ESSA price

ESSA encoders are devices used to measure rotational speed and, when combined with PWM technology, enable rapid speed adjustment. Optical rotary encoders convert mechanical quantities such as angular displacement and angular velocity of the output shaft into corresponding electrical pulses via photoelectric conversion, outputting them as digital signals (REP). They are available in single-channel output and dual-channel output types. Key technical parameters include pulses per revolution (ranging from tens to thousands) and supply voltage. Single-channel output means the rotary encoder outputs one set of pulses, while dual-channel output rotary encoders output two sets of pulses with a A/B phase difference of 90 degrees. Using these two sets of pulses allows not only speed measurement but also determination of the direction of rotation. Based on signal output type, they are classified as: voltage output, open-collector output, push-pull complementary output, and line-driver output.

ESSA encoder installation and usage

Absolute rotary encoders can be mechanically installed in various ways, including high-speed end installation, low-speed end installation, and auxiliary mechanical device installation. High-speed end installation: Mounted on the drive motor shaft end (or via gear connection). The advantage of this method is high resolution; since multi-turn encoders have 4096 turns, and the motor's rotation count falls within this range, the full range can be utilized to improve resolution. The disadvantage is that when the moving object passes through reduction gears, there is backlash error during forward and reverse motion. This method is generally used for unidirectional high-precision control positioning, such as roll gap control in steel rolling. Additionally, when the encoder is directly installed on the high-speed end, motor vibration must be minimal; otherwise, the encoder is prone to damage. Low-speed end installation: Installed after the reduction gear, such as on the shaft end of a hoist wire rope drum or the last stage of the reduction gear shaft. This method eliminates gear backlash, provides more direct measurement, and offers higher accuracy. It is generally used for long-distance positioning measurements, such as in various lifting equipment and feed cart positioning. Auxiliary mechanical installation: Common methods include rack and pinion, chain and belt, friction wheels, and cable retraction mechanisms.

ESSA encoder working principle

The optical code disk of a series absolute encoder has many light channel tracks. Each track is arranged sequentially with 2 lines, 4 lines, 8 lines, and 16 lines. At each position of the encoder, by reading the light and dark states of each track, a unique 2-ary code (Gray code) is obtained, ranging from the zeroth power of 2 to the n-1th power of 2. This is referred to as an n-bit absolute encoder. Such encoders are determined by the mechanical position of the optical code disk and are unaffected by power outages or interference. Absolute encoders determine the code based on mechanical position; they require no memory, no reference point search, and no continuous counting. The position is read whenever it is needed. Thus, the encoder's anti-interference characteristics and data reliability are significantly improved.

ESSA encoder hybrid type

Hybrid absolute encoders output two sets of information: one set detects magnetic pole position and provides absolute information functionality; the other set is identical to the output information of incremental encoders. Optical encoders are angle (angular velocity) detection devices. They convert the angular quantity input to the shaft into corresponding electrical pulses or digital values using the principle of photoelectric conversion. They offer advantages such as compact size, high precision, reliable operation, and digital interfaces. They are widely used in devices and equipment requiring angle detection, such as CNC machine tools, rotary tables, servo drives, robots, radar, and military target determination.

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