Pole Pieces: Core Loss <2.5 W/kg @ 1.5T/400Hz

Component Specifications

Definition

Pole pieces are precisely engineered ferromagnetic components that form part of permanent magnet assemblies in electrical machines. They serve as flux concentrators and directors, creating well-defined magnetic poles that interact with armature windings to convert electrical energy to mechanical motion (or vice versa). Their geometry, material properties, and positioning critically influence magnetic circuit efficiency, torque production, and overall machine performance.

Working Principle

Pole pieces work by providing a low-reluctance path for magnetic flux generated by permanent magnets. They concentrate and direct this flux across air gaps toward armature conductors, creating strong magnetic fields where needed while minimizing leakage. This shaping enhances magnetic coupling, improves torque density, and reduces cogging in motors and generators.

Materials

Typically made from high-permeability, low-coercivity soft magnetic materials: electrical steel laminations (Si-Fe alloys, 0.35-0.65mm thickness), solid low-carbon steel, or specialized soft magnetic composites (SMC). Surface treatments may include phosphating, nickel plating, or insulating coatings to reduce eddy currents and corrosion.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Core Loss	<2.5 W/kg @ 1.5T/400Hz
Flux Density	1.2-1.8 T
Permeability	>2000 μr
Surface Roughness	Ra 0.8-1.6 μm
Dimensions Tolerance	±0.05 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 683-17, DIN EN 10106, IEC 60404-8-7

Parent Products

This component is used in the following industrial products

Permanent Magnet Assembly

A magnetic field generation component within electromagnetic vibration testing equipment

View Product Details

Engineering Analysis

Risks & Mitigation

Magnetic saturation leading to reduced efficiency
Eddy current losses causing overheating
Mechanical deformation under magnetic forces
Corrosion in harsh environments

FMEA Triads

Trigger: Material degradation due to overheating
Failure: Reduced magnetic permeability and increased core losses
Mitigation: Implement thermal monitoring and use temperature-stable materials

Trigger: Poor manufacturing tolerances
Failure: Increased magnetic reluctance and flux leakage
Mitigation: Apply precision machining and strict quality control

Trigger: Inadequate surface insulation
Failure: Excessive eddy current losses
Mitigation: Use proper insulating coatings and verify dielectric strength

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-m, magnetic properties within ±5% of specification

Test Method

Magnetic flux measurement using Hall probes or search coils, permeability testing per IEC 60404-2, dimensional verification with CMM

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

Manufacturers of Pole Pieces

Manufacturer profiles associated with Pole Pieces.

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Frequently Asked Questions

What is the primary function of pole pieces in permanent magnet assemblies?

Their primary function is to shape and direct magnetic flux efficiently, creating well-defined magnetic poles that maximize torque production and minimize energy losses in electrical machines.

Why are pole pieces often laminated?

Lamination reduces eddy current losses by interrupting circulating currents in the magnetic material, which is especially important in AC applications where magnetic fields change rapidly.

Can pole pieces be used with different magnet types?

Yes, they work with various permanent magnet materials (neodymium, samarium-cobalt, ferrite) but must be designed with specific magnetic properties to match the magnet's characteristics.

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.

Pole Pieces