Encoders

Part Number	Description / PDF	Quantity
EMS22Q51-C28-LS4 J.W. Miller / Bourns	ROTARY ENCODER MAGNETIC 256PPR	0
ECW1J-B24-AB0012L J.W. Miller / Bourns	ROTARY ENCODER MECHANICAL 12PPR	6
EMS22A50-D28-LT6 J.W. Miller / Bourns	ROTARY ENCODER MAGNETIC 1024PPR	15
EAW0J-B24-CE0128L J.W. Miller / Bourns	ROTARY ENCODER MECHANICAL 128PPR	0
PEC11H-4220F-S0024 J.W. Miller / Bourns	ROTARY ENCODER WITH BALL/SPRING	504
3315P-001-006L J.W. Miller / Bourns	ROTARY ENCODER MECHANICAL 6PPR	141
PEC16-2220F-N0024 J.W. Miller / Bourns	ROTARY ENCODER MECHANICAL 24PPR	42
PEC09-2020F-S0015 J.W. Miller / Bourns	ROTARY ENCODER MECHANICAL 15PPR	0
EM14A1D-B24-L032S J.W. Miller / Bourns	ROTARY ENCODER OPTICAL 32PPR	0
PEC11H-4220K-S0024 J.W. Miller / Bourns	ROTARY ENCODER WITH BALL/SPRING	471
EM14A1B-C24-L032S J.W. Miller / Bourns	ROTARY ENCODER OPTICAL 32PPR	0
PEC11R-4030F-S0018 J.W. Miller / Bourns	ROTARY ENCODER MECHANICAL 18PPR	0
EPS1D-F19-BD0024L J.W. Miller / Bourns	ROTARY ENCODER MECHANICAL 24PPR	87
PEC11R-4230F-N0024 J.W. Miller / Bourns	ROTARY ENCODER MECHANICAL 24PPR	37
EM14A0D-C28-L032S J.W. Miller / Bourns	ROTARY ENCODER OPTICAL 32PPR	0
PEL12T-4225S-S1024 J.W. Miller / Bourns	ROTARY ENCODER MECHANICAL 24PPR	1182
PEC12R-3020F-N0024 J.W. Miller / Bourns	ROTARY ENCODER	545
EM14A0D-C24-L064N J.W. Miller / Bourns	ROTARY ENCODER OPTICAL 64PPR	0
EM14A0D-C24-L008N J.W. Miller / Bourns	ROTARY ENCODER OPTICAL 8PPR	1
ES14A0D-E28-L032N J.W. Miller / Bourns	ROTARY ENCODER OPTICAL 32PPR	0

Encoders

1. Overview

Encoders are electro-mechanical devices that convert mechanical motion into digital signals. They play a critical role in measuring position, velocity, and direction in automation systems. By translating physical movement into electrical signals, encoders enable precise control in industrial machinery, robotics, and motion control systems. Their importance continues to grow with advancements in Industry 4.0, smart manufacturing, and autonomous systems.

2. Main Types & Functional Classification

Type	Functional Characteristics	Application Examples
Rotary Encoders	Measure angular position/speed using optical/magnetic sensors	CNC machine spindles, motor feedback systems
Linear Encoders	Track straight-line motion with scale and readhead	Coordinate measuring machines, semiconductor manufacturing
Absolute Encoders	Provide unique digital position codes at power-on	Robot joint positioning, multi-axis systems
Incremental Encoders	Generate pulse trains for relative motion measurement	Conveyor belts, speed monitoring systems

3. Structure & Components

Typical encoder construction includes: - Housing (metal/plastic for environmental protection) - Shaft/bearing system (precision-machined for rotational stability) - Sensor module (optical code disk with LED/photodetector or magnetic Hall-effect sensors) - Signal processing circuitry (for noise filtering and waveform shaping) - Output interface (push-pull, open-collector, or digital fieldbus)

4. Key Technical Specifications

Parameter	Importance	Typical Values
Resolution (PPR)	Determines measurement precision	100-10,000 PPR
Accuracy (arc-minutes)	Indicates position measurement reliability	1 to 20 arc-minutes
Output Type	Affects system compatibility	Incremental: TTL/HTL, Absolute: SSI/CANopen
Environmental Rating	Defines operating conditions	IP54-IP69K for dust/water resistance

5. Application Fields

Industrial Automation: Machining centers, assembly robots
Automotive: Electric power steering systems, transmission control
Renewable Energy: Wind turbine blade pitch control
Medical: MRI scanner positioning systems
Aerospace: Flight control surface monitoring

6. Leading Manufacturers & Products

Manufacturer	Product Series	Key Features
Heidenhain	ROC4000	23-bit absolute rotary encoder with 0.1 m accuracy
Omron	E6B2-CWZ6C	Incremental encoder with 1000 PPR and IP67 rating
Balluff	BML-CRK-P-2	Magnetic linear encoder with 1 m resolution
CUI Devices	AMT22	Programmable absolute encoder with SPI interface

7. Selection Guidelines

Key considerations include: - Application type (position vs. speed measurement) - Required resolution and mechanical accuracy - Environmental factors (temperature, vibration, contamination) - Output signal compatibility (analog/digital, communication protocol) - Mechanical mounting constraints (shaft size, space limitations) - Cost-performance trade-offs for the specific application

8. Industry Trends

Current trends shaping encoder technology: - Integration with IoT-enabled condition monitoring systems - Development of high-temperature encoders for extreme environments - Miniaturization for medical and aerospace applications - Adoption of wireless signal transmission for mobile equipment - Increasing use of multi-turn absolute encoders without battery backup - Enhanced cybersecurity features for industrial network protocols

Real-world implementation example: In semiconductor manufacturing, Heidenhain's linear encoders with 1 m accuracy enable nanometer-precision wafer positioning during photolithography processes, achieving 99.999% production yield rates.