Servo Motor Encoder Disk

Name: Servo Motor Encoder Disk | Closed-Loop Control Disk - Frigate
Price: 249.00 USD
Availability: InStock

Servo motor systems demand encoder disks that pflegen signal integrity, mechanical stability, and long-term reliability across variable speed and load conditions. Encoder disk selection impacts the entire feedback loop performance—affecting position control, system repeatability, and motor responsiveness. Engineers evaluating encoder disks must address issues related to concentricity, resolution, environmental stability, and long-term mechanical behavior under cyclical stress.

Material

Stainless Steel (17-4PH), Aluminum 6061-T6, Ferritic Stainless Steel (430F)

Dimensional Tolerances

OD – ±0.01 mm; ID: H6 (ISO 286); Thickness – ±0.005 mm

Pattern Accuracy

Slot/Pitch Tolerance – ±1 µm (optical), ±5 µm (magnetic); Radial Alignment – ≤0.005° angular deviation

Runout/Flatness

Axial Runout – ≤0.01 mm; Flatness – ≤0.005 mm/100 mm

Centricity

Bore-to-Pattern – ≤0.005 mm TIR

Product Description

Optical signals generated by encoder disks tend to degrade at elevated shaft speeds due to eccentric pattern placement, disk warpage, and misaligned tracks. High-RPM systems such as robotic joints or direct-drive servo stages exhibit phase jitter and increased velocity error when feedback pulses deviate from intended intervals. Encoder disks are manufactured with radial error control within ±1 µm, verified under rotary test benches at up to 15,000 RPM.

Surface Finish

Optical Face – Ra ≤0.05 µm (super-polished); Magnetic Face – Ra ≤0.2 µm

Burr-Free Requirement

Laser-Cut Edges – ≤5 µm radius; ISO 13715 Compliant

Cleanliness

Class 10 Cleanroom Packaged; Particulate – ≤0.1 mg/cm² Ionic Contamination – ≤1 µg NaCl/cm²

Protective Coating

Black Oxide (Custom Coatings based on Request)

Certification Standards

IEC 61800-9 (Servo Systems), DIN 874-1 (Precision Scales), ISO 9001:2015

Technical Advantages

Servo systems operating across wide temperature ranges face feedback instability due to thermal expansion mismatch between the encoder disk and the motor shaft. Changes in ambient or operational temperature result in minor but accumulative geometric shifts, leading to positional offset over time. Encoder disks are constructed using low-expansion optical substrates such as fused quartz or dimensionally stabilized polyimide-laminated films with thermal expansion coefficients under 0.5 ppm/°C.

Photodetector arrays and optical readheads require precise track-to-sensor alignment to maintain decoding accuracy. Variations in disk hub machining or concentricity introduce alignment shifts between the index pulse and the sensor array, affecting homing precision and encoder calibration. Encoder disks are manufactured with concentricity tolerances better than 2 µm and include fiducial patterns aligned to the index mark for automated visual registration.

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Industry Applications

Robotic Joint Control

Enables precise angular feedback for multi-axis robotic arms, supporting high-speed interpolation and synchronized motion in closed-loop systems.

CNC Machine Axis Feedback

Provides high-resolution position signals for linear and rotary axes, ensuring sub-micron toolpath accuracy and consistent surface finish.

Semiconductor Wafer Handling Systems

Delivers ultra-stable rotational feedback for wafer transfer robots, minimizing positional drift during high-vacuum, contamination-sensitive operations.

Pick-and-Place Automation Equipment

Supports repeatable indexing in high-speed placement heads, enabling genaue Komponente positioning in SMT and micro-assembly machines.

Medical Imaging Gantry Rotation

Maintains low-latency angular tracking of rotating gantry systems, critical for synchronizing imaging and radiation delivery components.

Textile Machinery Servo Control

Coordinates high-frequency shaft motion in yarn winding, knitting, and cutting mechanisms requiring continuous feedback under dynamic loading.

Shaft Coupling Constraints and Mechanical Integration

Servo motors used across industries exhibit non-standardized shaft geometries, including stepped bores, keyways, and press-fit retention. Standard encoder disk solutions often fail during high-dynamic acceleration due to poor shaft-disk interface compatibility. Encoder disks are engineered with configurable bore dimensions (5 mm to 30 mm), radial clamping features, and optional anti-rotation tabs.

Dust, oil vapors, and airborne particulates present in machine enclosures interfere with optical transmission in open encoder systems. Accumulated contamination leads to intensity modulation, resulting in read errors and false pulse detection. Encoder disks are fabricated with anti-reflective and oleophobic coatings designed for high-transmission efficiency in the 650–850 nm optical band.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate ensure encoder disk stability during high-speed rotation above 10,000 RPM?

Fregatte manufactures encoder disks with radial error limits below ±1 µm to prevent timing variation during high-speed shaft rotation. Disks undergo dynamic balancing and rotary inspection at simulated operating speeds. This ensures consistent edge detection for optical sensors without phase jitter. The result is stable velocity feedback even under rapid acceleration profiles.

What testing methods does Frigate use to validate encoder disk optical track quality?

Frigate employs submicron-resolution vision inspection systems to check pattern edge fidelity and track uniformity. Each disk undergoes spectral reflectance testing in the 650–850 nm band to confirm transmission consistency. Optical contrast is verified to exceed 80% modulation depth for reliable signal decoding. These tests ensure minimal signal distortion in high-resolution feedback loops.

How does Frigate address thermal expansion mismatches between encoder disks and motor shafts?

Frigate selects disk substrates with low coefficients of thermal expansion, such as fused quartz and engineered polyimide laminates. These materials maintain dimensional integrity across 0°C to 85°C operating ranges. This prevents positional drift caused by thermal deformation during long duty cycles. Dimensional stability is confirmed through thermal cycling and displacement metrology.

Can Frigate encoder disks be customized for non-standard shaft or flange interfaces?

Frigate offers custom bore diameters, D-cuts, key slots, and anti-rotation features based on user mechanical constraints. Mounting runout is maintained below 2 µm through precision CNC and laser tooling. This ensures concentric coupling and minimal mechanical play during bidirectional motion. Customizations are validated against CAD references and in-assembly test rigs.

What design features help Frigate encoder disks resist contamination in industrial environments?

Frigate applies anti-reflective and oleophobic coatings to the optical surface, enhancing resistance to oil mist, dust, and vapors. These coatings pflegen high transmission efficiency under contaminated airflows. The disks are also available in sealed configurations for harsh environments. Coating durability is tested through abrasion and chemical resistance protocols.

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