INDUSTRY COMPONENT

Armature Shaft

A precision-machined shaft that forms the central rotating element of an armature assembly in electric motors and generators.

View Specifications

Component Specifications

Definition
The armature shaft is a critical rotating component in electric machines that supports the armature core, windings, and commutator. It transmits torque from the electromagnetic forces generated in the armature to the mechanical load while maintaining precise alignment within bearings. The shaft must withstand torsional, bending, and axial loads during operation while maintaining dimensional stability under varying thermal conditions.
Working Principle
The armature shaft rotates within magnetic fields created by field windings or permanent magnets. When current flows through armature windings, electromagnetic forces create torque that causes shaft rotation. The shaft converts this electromagnetic energy into mechanical rotation that drives external machinery.
Materials
Typically manufactured from medium-carbon steel (AISI 1045, 4140) or alloy steel (AISI 8620) with surface hardening. High-performance applications may use stainless steel (17-4PH) or specialized alloys for corrosion resistance or high-temperature operation.
Technical Parameters
  • Hardness HRC 40-55
  • Straightness 0.02 mm/m
  • Balance Grade G2.5 per ISO 1940
  • Surface Finish Ra 0.4-0.8 μm
  • Runout Tolerance 0.015 mm TIR
  • Keyway Dimensions Per ISO 773
  • Diameter Tolerance ±0.01 mm
Standards
ISO 1940, ISO 286, DIN 748, DIN 6885

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Armature Shaft.

armature shaft motor shaft generator shaft rotating component electric machine parts shaft manufacturing motor components Armature Shaft in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Armature Assembly

The rotating component of a vibration exciter that generates mechanical vibration through electromagnetic interaction.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Fatigue failure from cyclic loading
  • Bearing seizure due to improper lubrication
  • Torsional overload during startup
  • Corrosion in harsh environments
  • Thermal expansion causing misalignment
FMEA Triads
Trigger: Insufficient lubrication
Failure: Bearing seizure leading to shaft scoring and increased friction
Mitigation: Implement automatic lubrication systems with flow monitoring and regular maintenance schedules
Trigger: Cyclic torsional loading exceeding fatigue limits
Failure: Fatigue cracks initiating at stress concentrators (keyways, diameter changes)
Mitigation: Design with generous fillet radii, specify higher fatigue strength materials, implement torque limiting devices
Trigger: Thermal expansion mismatch between shaft and mounted components
Failure: Interference fit loosening or excessive stress during temperature cycles
Mitigation: Select materials with compatible thermal expansion coefficients, design with appropriate clearance fits for temperature ranges

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Geometric tolerances per ISO 1101, dimensional tolerances per ISO 286 IT7 grade
Test Method
Dimensional verification with CMM, surface roughness testing per ISO 4287, hardness testing per ISO 6508, dynamic balancing per ISO 1940, NDT inspection for cracks

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.

Related Components

Inspection Frame
Structural support component in automated fabric inspection systems that holds cameras, sensors, and lighting for defect detection.
Machine Frame
The rigid structural foundation of a CNC wood router that provides stability, vibration damping, and precision alignment for cutting operations.
pH Sensor Assembly
Precision pH sensor assembly for automated monitoring and dosing systems in industrial applications
Load Cell Assembly
Precision load cell assembly for automated powder dispensing systems

Frequently Asked Questions

What is the primary function of an armature shaft?

The armature shaft transmits torque from electromagnetic forces to mechanical loads while supporting rotating components and maintaining precise alignment within bearings.

How are armature shafts balanced?

Armature shafts undergo dynamic balancing to ISO 1940 standards, typically achieving G2.5 balance grade through material removal or addition at specific locations.

What causes armature shaft failure?

Common failure causes include fatigue cracking from cyclic loading, bearing seizure due to lubrication failure, torsional overload, corrosion, and thermal expansion mismatches.

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.

Request Manufacturing Insight for Armature Shaft

Armature Plate Array Housing/Frame