Scale/Rotor: Diameter 10-200 mm, Accuracy ±0.01° to ±0.5°

Q: What is the difference between a scale and a rotor in feedback devices?

In this context, 'scale' refers to the calibrated markings or patterns on the rotor, while 'rotor' is the physical rotating component. They are often integrated as one part.

Q: How do I select the right scale/rotor for my application?

Consider required accuracy, resolution, rotational speed, environmental conditions (temperature, contaminants), mounting compatibility, and material durability.

Q: Can scale/rotors be replaced independently?

Yes, but replacement requires precise alignment and calibration. Use manufacturer-recommended parts to maintain system accuracy.

Component Specifications

Definition

A scale/rotor is a calibrated rotating element within feedback devices such as encoders, resolvers, or tachometers. It converts mechanical rotation into measurable electrical signals through principles like optical interruption, magnetic induction, or capacitive coupling. This component provides critical real-time data for closed-loop control systems in industrial automation.

Working Principle

Operates by interrupting light beams (optical encoders), varying magnetic fields (magnetic encoders), or changing capacitance. As the rotor rotates, it generates patterned signals detected by sensors, which are processed to determine precise rotational speed, angular position, or direction.

Materials

Typically aluminum alloy (e.g., 6061-T6) for lightweight rigidity, stainless steel (e.g., 304/316) for corrosion resistance, or engineered plastics (PEEK, Delrin) for low inertia. May include magnetic coatings (ferrite, neodymium) or optical patterns (chrome on glass).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	5-500 g
Max RPM	10,000-50,000
Accuracy	±0.01° to ±0.5°
Diameter	10-200 mm
Mounting	Shaft, flange, or through-hole
Resolution	100-10,000 pulses/revolution
Operating Temperature	-40°C to 120°C

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 16063, DIN 19245, IEC 60034

Parent Products

This component is used in the following industrial products

Feedback device

A sensor component that provides real-time position, velocity, or torque data to the motor controller.

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Engineering Analysis

Risks & Mitigation

Misalignment causing signal errors
Material fatigue under high RPM
Contamination affecting optical/magnetic signals
Thermal expansion altering calibration

FMEA Triads

Trigger: Improper mounting or shaft misalignment
Failure: Inaccurate positional feedback leading to control errors
Mitigation: Use precision alignment tools during installation and regular calibration checks

Trigger: Material degradation from excessive heat or vibration
Failure: Rotor deformation or pattern damage causing signal loss
Mitigation: Select appropriate temperature-rated materials and implement vibration damping

Trigger: Contaminant buildup (dust, oil) on optical/magnetic surfaces
Failure: Signal attenuation or complete failure
Mitigation: Install protective seals and implement regular cleaning maintenance

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Radial runout < 0.02 mm, axial play < 0.01 mm, balance grade G2.5 per ISO 1940

Test Method

Laser interferometry for positional accuracy, dynamic balancing tests, environmental stress screening (temperature, vibration)

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

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Scale/Rotor

Manufacturer profiles associated with Scale/Rotor.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between a scale and a rotor in feedback devices?