Sensor/detector: Temperature range -40°C to +120°C

Q: What is the difference between incremental and absolute sensor types in rotary encoders?

Incremental sensors output pulse trains (A/B channels) for relative position changes and require a reference point. Absolute sensors provide a unique digital code for each shaft position, retaining position after power loss.

Q: How do resolver sensors differ from optical encoder sensors?

Resolver sensors use inductive coupling between rotor and stator windings to produce analog sine/cosine signals, offering high robustness in harsh environments. Optical sensors use light patterns for higher resolution but are sensitive to contamination.

Component Specifications

Definition

A critical sensing element within rotary encoders and resolvers that detects mechanical rotation and converts it into precise electrical signals (digital pulses or analog sine/cosine waves) for position, velocity, and direction feedback in closed-loop control systems.

Working Principle

Operates on optical, magnetic, or inductive principles. Optical types use a light source, code disk with patterns, and photodetectors to generate pulses. Magnetic types use Hall-effect sensors and magnetized rotors. Resolvers use inductive coupling between rotor and stator windings to produce sine/cosine outputs proportional to shaft angle.

Materials

Housing: Aluminum alloy or stainless steel; Sensing elements: Silicon photodiodes (optical), rare-earth magnets (magnetic), copper windings (resolvers); Code disk: Glass or polymer with chrome patterning (optical); Bearings: Stainless steel or ceramic.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Accuracy	±1 arc-second to ±5 arc-minutes
Resolution	Up to 24-bit absolute, 10,000 PPR incremental
Output Signal	A/B/Z pulses (incremental), SSI/SPI/BiSS (absolute), 1Vpp sine/cosine (resolver)
Supply Voltage	5VDC, 12-24VDC
Operating Speed	Up to 30,000 RPM
Protection Rating	IP65 to IP69K
Temperature Range	-40°C to +120°C
Electrical Interface	Push-pull, line driver, HTL, TTL

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 13849-1, IEC 60034, DIN 40050, EN 60529

Parent Products

This component is used in the following industrial products

Rotary Encoder/Resolver

A sensor that converts the angular position or motion of a shaft to an analog or digital signal.

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Engineering Analysis

Risks & Mitigation

Signal degradation from contamination (optical types)
Electromagnetic interference affecting accuracy
Mechanical wear in bearings
Temperature extremes beyond specification
Moisture ingress damaging electronics

FMEA Triads

Trigger: Contamination on optical code disk
Failure: Signal loss or erroneous position reading
Mitigation: Use sealed housings (IP67+), regular cleaning protocols, or switch to magnetic sensing in dirty environments

Trigger: Bearing wear or shaft misalignment
Failure: Increased mechanical error, vibration, eventual seizure
Mitigation: Proper installation alignment, use of flexible couplings, scheduled bearing replacement per maintenance guidelines

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Position accuracy within ±0.001° to ±0.1° depending on grade; repeatability <1 arc-second for high-precision models

Test Method

Laser interferometer calibration per ISO 230-2, electrical signal verification with oscilloscope and encoder tester, environmental testing per IEC 60068-2

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Frequently Asked Questions

What is the difference between incremental and absolute sensor types in rotary encoders?