INDUSTRY COMPONENT

Stator Plates

Stator plates are stationary conductive plates in variable capacitors that adjust capacitance by changing overlap area with rotor plates.

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Component Specifications

Definition
Stator plates are fixed conductive elements in variable capacitors that form one set of electrodes in a parallel-plate capacitor configuration. They remain stationary while rotor plates rotate to vary the effective overlapping area, thereby changing capacitance. These plates are precisely manufactured to maintain consistent spacing and surface quality for stable electrical performance across the adjustment range.
Working Principle
Stator plates work as stationary electrodes in a variable capacitor system. When rotor plates rotate relative to stator plates, the overlapping area changes, altering capacitance according to C = εA/d, where ε is permittivity, A is overlap area, and d is plate separation. This allows precise tuning of resonant circuits in RF applications.
Materials
High-conductivity oxygen-free copper (C10100/C10200) or aluminum alloy (6061-T6) with silver or gold plating for corrosion resistance. Dielectric spacers typically use ceramic (alumina) or high-grade plastics (PTFE/PEEK).
Technical Parameters
  • Plate thickness 0.3-1.2 mm
  • Surface flatness ≤0.05 mm/m
  • Capacitance range 5-500 pF
  • Operating voltage 100-1000 VDC
  • Surface roughness Ra ≤ 0.8 μm
  • Electrical conductivity ≥95% IACS (copper)
  • Temperature coefficient ≤50 ppm/°C
Standards
IEC 60384-1, MIL-C-14409D, ISO 286-2

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Stator Plates.

stator plates variable capacitor plates stationary capacitor electrodes RF tuning components capacitance adjustment plates electrical components Stator Plates in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Variable Capacitor

A capacitor whose capacitance can be intentionally and repeatedly changed mechanically or electronically.

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Engineering Analysis

Risks & Mitigation
  • Dielectric breakdown at high voltages
  • Corrosion reducing conductivity
  • Mechanical deformation affecting spacing
  • Contact wear in sliding configurations
  • Thermal expansion mismatches
FMEA Triads
Trigger: Insufficient plating thickness
Failure: Corrosion and increased contact resistance
Mitigation: Specify minimum plating thickness (≥2μm gold or ≥5μm silver) and implement regular coating thickness verification
Trigger: Improper material selection
Failure: Thermal expansion mismatch causing spacing variation
Mitigation: Use materials with matched thermal expansion coefficients and implement thermal cycling tests
Trigger: Manufacturing debris between plates
Failure: Short circuits or inconsistent capacitance
Mitigation: Implement cleanroom assembly procedures and automated optical inspection

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Plate spacing tolerance ±0.02 mm, parallelism ≤0.01 mm, surface flatness ≤0.05 mm/m
Test Method
Capacitance measurement per IEC 60384-1, dielectric withstand test at 2x rated voltage, contact resistance measurement using 4-wire method

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between stator plates and rotor plates in variable capacitors?

Stator plates are fixed stationary plates, while rotor plates are mounted on a shaft and rotate to change overlap area with stator plates, thereby varying capacitance.

Why are stator plates typically made of copper or aluminum?

Copper and aluminum offer excellent electrical conductivity, good machinability, and reasonable cost. Copper provides better conductivity while aluminum offers lighter weight.

How do manufacturing tolerances affect stator plate performance?

Tight tolerances on plate flatness, parallelism, and spacing ensure consistent capacitance values, minimize parasitic effects, and provide smooth tuning characteristics across the adjustment range.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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