INDUSTRY COMPONENT

Pole Pieces

Pole pieces are ferromagnetic components in permanent magnet assemblies that shape and direct magnetic flux for efficient energy conversion in electrical machines.

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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
  • 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
Standards
ISO 683-17, DIN EN 10106, IEC 60404-8-7

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Pole Pieces.

pole pieces magnetic pole pieces permanent magnet assembly flux concentrator electrical steel laminations motor components generator parts magnetic circuit design Pole Pieces in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Permanent Magnet Assembly

A magnetic field generation component within electromagnetic vibration testing equipment

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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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.6 / 5.0 (23 reviews)

"The technical documentation for this Pole Pieces is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Electrical Equipment Manufacturing environments. No issues with the Pole Pieces so far."

"Testing the Pole Pieces now; the technical reliability results are within 1% of the laboratory datasheet."

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Polarization Key Positive Terminal