Armature Shaft: Diameter Tolerance ±0.01 mm, Hardness HRC 40-55

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

Parameter	Typical range	Notes & selection driver
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

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 1940, ISO 286, DIN 748, DIN 6885

Parent Products

This component is used in the following industrial products

Armature Assembly

Rotating component of a vibration exciter that converts electrical energy into controlled mechanical vibration through electromagnetic interaction.

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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

Typical Suppliers & Equivalents

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

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

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Manufacturers of Armature Shaft

Manufacturer profiles associated with Armature Shaft.

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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 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.

Data Basis

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

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.

Armature Shaft