Editorial Technical Reference

X-Ray Tube Rotor Assembly

This page explains how X-Ray Tube Rotor Assembly is classified within Manufacture of Irradiation, Electromedical and Electrotherapeutic Equipment. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The X-ray tube rotor assembly is a critical rotating component within medical X-ray tubes used in diagnostic imaging equipment.

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X-Ray Tube Rotor Assembly in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for X-Ray Tube Rotor Assembly

Definition
The X-ray tube rotor assembly is a critical rotating component within medical X-ray tubes used in diagnostic imaging equipment. It consists of a precisely balanced anode target mounted on a high-speed rotor shaft, which rotates to distribute heat during X-ray generation. This component enables higher power output and longer tube life by preventing localized overheating of the anode material. Manufacturers supply these assemblies to medical equipment OEMs for integration into X-ray tubes used in radiography, fluoroscopy, and CT scanning systems. The assembly is designed to operate at rotational speeds typically between 3,000 and 10,000 RPM, with anode target diameters ranging from 70 to 160 mm. Rotor inertia values are typically between 0.01 and 0.05 kg·m², and the maximum allowable anode surface temperature is 1200–1400 °C. The assembly commonly uses ball bearings and is driven by a motor operating at 24–120 V. The rotor material is typically a copper alloy for high thermal conductivity, and the total weight of the assembly is in the range of 2–5 kg. The balancing grade is specified as G2.5 per ISO 1940-1 to ensure smooth operation at high speeds. The assembly is designed for an operating temperature range of -40 to 85 °C and an ingress protection rating of IP54–IP65 per IEC 60529. The operating pressure range is 1.0–1.6 MPa. Materials used include molybdenum alloy, tungsten-rhenium alloy, copper, and stainless steel. These values are reference ranges; model-specific parameters must be verified with the legal manufacturer or supplier. The assembly is a component intended for integration by qualified medical equipment manufacturers.
Working Principle
An electric motor drives the rotor assembly at high speeds (typically 3,000-10,000 RPM), causing the anode target to rotate. When electrons strike the rotating anode surface, X-rays are produced while centrifugal force helps dissipate heat across the entire target area rather than concentrating it at a single spot. This rotation prevents localized overheating, allowing higher power output and extending the tube's operational life. The rotor's inertia and balancing are critical to maintain stability at high speeds, and the bearing system supports the rotating shaft while minimizing friction and wear.
Common Materials
Molybdenum alloy, Tungsten-rhenium alloy, Copper, Stainless steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Maximum Rotation SpeedRequired3000–10000 RPMPeak operational rotational speed
Anode Target DiameterRequired70–160 mmDiameter of the rotating anode disc
Rotor InertiaRequired0.01–0.05 kg·m²Moment of inertia of rotating assembly
Maximum Anode TemperatureRequired1200–1400 °CMaximum allowable anode surface temperature
Bearing TypeRequiredBall bearing textType of bearings used (e.g., ball, fluid film)
Motor Voltage24–120 VOperating voltage for rotor drive motor
Operating Temperature Range-40–85 °CNon-operating storage range.
Ingress Protection RatingIP54–IP65Protection against dust and water jets.IEC 60529
Rotor MaterialCopper alloyHigh thermal conductivity for heat dissipation.
Weight2–5 kgAffects mounting and balance.
Balancing GradeG2.5Ensures smooth operation at high speeds.ISO 1940-1

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

Components / BOM
  • Anode Target Disc Part
    X-ray generation surface that electrons strike
    Material: Tungsten-rhenium alloy
  • Rotor Shaft Part
    Central rotating element connecting anode to bearings
    Material: Molybdenum alloy
  • Bearings Part
    Support and enable smooth high-speed rotation
    Material: Stainless steel with ceramic balls
  • Stator Windings Part
    Stationary electromagnetic coils that drive rotation
    Material: Copper wire with insulation
  • Balance Weights Optional Part
    Precision weights for dynamic balancing
    Material: Tungsten alloy

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for X-Ray Tube Rotor Assembly.

Rotating anode assembly X-ray tube rotor Anode rotor assembly

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar absolute
other spec: Maximum rotational speed: 10,000 RPM, Vacuum level: <10^-5 mbar, Vibration limit: <2G at 50-2000 Hz
temperature: 20°C to 80°C (operating), -10°C to 100°C (storage)
Media Compatibility
✓ Medical-grade vacuum environments ✓ High-purity copper heat sinks ✓ Molybdenum/graphite anode materials
Unsuitable: High humidity or corrosive gas environments (causes oxidation/arcing)
Sizing Data Required
  • Required X-ray power output (kW)
  • Anode target diameter and angle
  • Cooling system capacity (heat dissipation rate)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bearing degradation
Cause: Lubricant breakdown due to high-temperature operation, leading to increased friction, wear, and eventual bearing seizure or excessive vibration.
Rotor imbalance or wobble
Cause: Uneven thermal expansion, material fatigue, or foreign particle ingress causing imbalance, leading to excessive vibration, noise, and potential catastrophic failure.
Maintenance Indicators
  • Unusual high-pitched whining or grinding noise during rotation, indicating bearing wear or imbalance.
  • Excessive vibration felt through the housing or visible wobble of the assembly, signaling imminent mechanical failure.
Engineering Tips
  • Implement a strict preventive maintenance schedule for lubrication replacement using high-temperature, vacuum-compatible lubricants specified by the manufacturer.
  • Ensure proper cooling system operation and monitor operating temperatures to prevent thermal stress and lubricant degradation.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 60601-2-44 Medical electrical equipment - Part 2-44: Particular requirements for the basic safety and essential performance of X-ray equipment for computed tomography ASTM E1441-19 Standard Guide for Computed Tomography (CT) Imaging

Quoted from the published standard.

Manufacturing Precision
  • Rotor shaft concentricity: ±0.005 mm
  • Bearing clearance: 0.01-0.03 mm
Quality Inspection
  • High-speed rotational balance test (to 10,000 RPM)
  • X-ray emission stability and uniformity test

Manufacturers of X-Ray Tube Rotor Assembly

Manufacturer profiles associated with X-Ray Tube Rotor Assembly.

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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 · Page last updated 6 September 2026

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Frequently Asked Questions

What is the typical rotational speed range for this rotor assembly?

The typical rotational speed range is 3,000 to 10,000 RPM, as listed in the reference parameters. However, the exact speed for a specific model must be confirmed with the legal manufacturer or supplier.

What materials are used in the rotor assembly?

The materials on file include molybdenum alloy, tungsten-rhenium alloy, copper, and stainless steel. The rotor material is typically a copper alloy for high thermal conductivity. Specific material grades should be verified with the manufacturer.

What is the balancing grade of the rotor assembly?

The balancing grade is specified as G2.5 according to ISO 1940-1. This ensures smooth operation at high speeds. However, the actual balancing grade for a specific product should be confirmed with the supplier.

What are the operating temperature and pressure ranges?

The operating temperature range is -40 to 85 °C, and the operating pressure range is 1.0 to 1.6 MPa. These are reference values; model-specific limits must be verified with the manufacturer.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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