Magnet System
Ferrite Y25–Y40 · NdFeB N35–N55 · bonded Br 0.20–0.78 T — selected by flux, temperature, corrosion and geometry.
Motor Rotor · Permanent Magnet Rotor
Permanent Magnet Rotor Manufacturer
GX Magnet supplies drawing-defined permanent magnet rotors and rotor subassemblies using sintered ferrite, sintered NdFeB or bonded magnet systems. Material grade, pole pattern, shaft or hub interface, magnet retention, air-gap geometry, runout and balance are reviewed as one rotor specification.
- Ferrite, sintered NdFeB and bonded magnet routes available by project
- Inner-rotor, outer-rotor, ring, segment and embedded structures reviewed from drawings
- Approved samples and agreed dimensional, magnetic and balance criteria control production
Drawing variables
Define the Rotor Structure from the Motor Requirements
Magnetic function, mechanical interfaces, speed and the mating stator must be reviewed as one rotor system.
Engineering data
Permanent Magnet Rotor Review Parameters
The specification is confirmed from the approved rotor drawing, magnetic target, mating stator, operating speed, environment and validation plan.
| Parameter | Specification / Review Basis |
|---|---|
| Structure / Supply Scope | 2–64 poles · inner / outer rotor — magnet component or shaft + core/carrier/hub + magnet mechanical assembly. |
| Component Materials | Ferrite Y25–Y40 · NdFeB N35–N55 with N/M/H/SH/UH/EH/AH grade families · bonded Br 0.20–0.78 T · electrical/solid steel core · steel/stainless shaft · PA66/PPS inserts — adhesive follows the application. |
| Dimensions / Fits | OD Ø8–150 mm · ID Ø2–80 mm · length 5–100 mm · shaft Ø2–30 mm · IT6–IT9 — final dimensions and bearing fits follow the approved drawing. |
| Poles / Magnetic Output | 2–64 poles · radial / axial / multipole · surface flux 50–500 mT · pole position ±1°–±3° — fixture, distance and temperature must be agreed. |
| Geometric Accuracy | Concentricity 0.01–0.10 mm · TIR 0.02–0.15 mm · straightness 0.01–0.10 mm/100 mm · Ra 0.4–3.2 μm — controlled from drawing datums. |
| Mechanical / Rotational | Retention 50–3,000 N · torque 0.1–100 N·m · balance G0.4–G6.3 · rated ≤20,000 rpm · maximum ≤30,000 rpm — test limits depend on rotor structure. |
| Environment / Acceptance | −40 to 150°C · overspeed 1.2× · salt spray 24–240 h · N48H reference demag ≤4% at 100°C × 2 h · AQL 0.65–1.5 — final method is project-defined. |
Typical review ranges only. Material grade, rotor size, speed, balance, retention and environmental limits are confirmed by the approved drawing, sample and agreed test conditions.
Project screening
What Buyers Should Define Before a Rotor RFQ
A workable quotation needs the rotor drawing, magnetic target, mechanical interfaces and operating limits—not only a rotor name or sample photo.
- Product form
- Magnet rotor, or shaft + core/carrier/hub + magnet mechanical assembly
- Material route
- Sintered ferrite, sintered NdFeB, bonded ferrite or bonded NdFeB
- Control focus
- Pole pattern, air-gap surface, interfaces, retention, runout and balance
- Required input
- 2D/3D files, motor type, pole map, speed, temperature, medium and annual demand
Product and supply scope
What Is a Permanent Magnet Rotor?
A permanent magnet rotor carries a fixed magnetic field on the rotating member of a motor. Magnet material and grade, pole layout, core or carrier, shaft or hub, retention method and air-gap surface jointly determine whether the assembly matches the motor.
GX supplies the drawing-approved rotor or mechanical rotor subassembly. The quotation covers only the confirmed BOM, assembly operations and acceptance plan; a stator, bearing system, electronics or complete motor is not included unless separately stated.
Drawing-based supplyRotor dimensions, datums, fits, magnet position and assembly interfaces are frozen before sample release.
Magnet-system reviewFerrite or NdFeB, sintered or bonded route, pole count, waveform target and environment are reviewed together.
Sample releaseFit, runout, balance, pole pattern and agreed magnetic results become the recurring-production baseline.
Supply boundaryUnconfirmed stators, housings, bearings, electronics and final motor assembly remain outside scope.
Project route
Material-Specific Processing, One Approved Rotor Standard
Ferrite, sintered NdFeB and bonded magnet routes use different upstream processes, then converge at drawing-controlled assembly, magnetization, balance and inspection.
Requirement Review
Drawing, BOM, pole map, magnetic target, speed, temperature, medium, validation and demand are reviewed together.
Material Route
Ferrite powder pressing and sintering, NdFeB sintering and coating, or bonded mixing and molding is selected by project.
Component Preparation
Magnets are ground, cut, coated or molded as required; shafts, cores, hubs and carriers are inspected before loading.
Rotor Assembly
Positioning, press fitting, bonding, mechanical locking, welding, overmolding or encapsulation follows the approved process.
Magnetize and Balance
Pole pattern, surface-flux waveform, assembly TIR, static or dynamic balance and agreed functional checks are verified.
Production Control
Approved sample, drawing revision, control plan, inspection frequency and traceable batch records govern recurring supply.
Verification
Verify Geometry, Magnetics and Rotation Under Defined Conditions
The control plan links drawing datums and material controls to the pole pattern, magnetic response, retention, runout, balance and environmental requirements agreed for the rotor.
| Inspection item | Control approach | Why the buyer needs it |
|---|---|---|
| Dimensions and datums | Projector, CMM, gauges and roughness equipment used as applicable to magnet, shaft, core and assembly features | Controls fits, concentric interfaces and the working air gap |
| Concentricity / TIR | Shaft datum, bearing seats, rotor OD and air-gap surface checked to the drawing | Supports stable rotation and consistent electromagnetic clearance |
| Magnetic performance | Material properties, total flux, surface-flux scan or waveform checked under the agreed fixture and distance | Makes magnetic results repeatable and comparable |
| Poles and retention | Magnetization direction, pole sequence and position verified; push-pull or speed testing added when specified | Confirms commutation, assembly security and application fit |
| Balance / environment | Static or dynamic balance plus thermal demagnetization, thermal shock, humidity, salt spray or PCT by project | Connects production release to speed and service conditions |
Application fit
Where Permanent Magnet Rotors Fit OEM Motor Designs
Each application requires its own combination of material, pole waveform, air-gap geometry, shaft or hub interface, speed, medium and validation evidence.
Automotive BLDC
Compact pump and actuator rotors reviewed for temperature, pole waveform, retention, balance and traceability.
Pump Rotors
Dry or wet-runner projects reviewed for fluid exposure, overmold or encapsulation boundary, runout and magnetic output.
Appliance and HVAC
Dishwasher, drain, circulation and fan-motor rotors controlled for multipole pattern, noise-related geometry and batch consistency.
Servo and Drives
Higher-speed structures reviewed for shaft fits, torque transfer, magnet retention, TIR and dynamic balance requirements.
Quality-system support
IATF 16949 Support for Drawing-Controlled Rotors
GX Magnet applies its IATF 16949:2016 quality system to drawing revision, material and process control, sample approval, inspection planning and recurring production records.
Revision and BOM Control
Material grade, magnet geometry, mechanical datums, pole map, retention and appearance follow the released revision.
Sample Approval
Dimensions, magnetic results, fit, TIR, balance and agreed reliability tests are recorded before production release.
Batch Inspection
Incoming, in-process and final controls use the agreed method, fixture, sampling level and acceptance limits.
Available project evidence can include dimensional reports, magnetic-property or surface-flux data, coating thickness, balance results and specified environmental-test records. Exact documents are agreed at quotation.
Buyer communication
Discuss Motor Rotor Projects Face to Face
GX Magnet uses industrial exhibitions to present magnetic materials, rotor assemblies and motor-component capabilities to OEM buyers, engineers and sourcing teams.
Bring the rotor drawing, mating-stator information or a magnetic-function question. The discussion can identify supply boundaries, interface risks and RFQ information needed before formal engineering review.
Sample Review
Compare magnet layouts, shaft or hub interfaces and rotor forms before choosing the quotation route.
Engineering Discussion
Review air gap, speed, runout, balance, environment and validation expectations.
Supplier Evaluation
Plan drawing review, sample approval, inspection evidence and recurring communication.
GX Magnet
Magnetic-Material and Motor-Component Experience Since 1992
GX Magnet’s established strengths include hard-ferrite material and ring-magnet production, supported by permanent-magnet material, molding, rotor assembly, magnetization and inspection routes for drawing-defined projects.
Ferrite Foundation
In-house ferrite powder, pressing, sintering, grinding and multipole magnet production support material-to-component control.
Rotor Assembly Routes
Automatic or project-specific loading, positioning, press fitting, bonding, welding, overmolding and balancing are reviewed by BOM.
Magnetic Verification
Material testing, magnetization, surface-flux scanning, waveform analysis and project-defined functional checks support release.
30+ Years Serving Clients Worldwide
FAQ
Permanent Magnet Rotor Sourcing Questions
Clarify the drawing, material route, interfaces, test conditions and supply boundary before comparing quotations or releasing samples.
What files and operating data does GX need for feasibility review?
Provide 2D and preferably 3D rotor files, the BOM and mating-stator or interface drawing, motor type, pole map, magnetic target and test condition, rated and maximum speed, temperature, medium, duty cycle, sample quantity and annual demand.
How should we choose ferrite, sintered NdFeB or bonded material?
Ferrite offers corrosion resistance and cost stability; sintered NdFeB supports higher magnetic output in limited volume; bonded materials suit complex geometry and multipole consistency. Final selection also depends on temperature, coating, retention, speed and the defined magnetic target.
Can GX supply a complete shaft, core, hub and magnet assembly?
Yes, when the parts and assembly operations are listed in the approved drawing and BOM. GX reviews bearing seats, fits, datums, torque transfer, retention, TIR, balance and inspection responsibility before confirming scope.
How are pole pattern and magnetic output specified without ambiguity?
Define magnetization direction, pole count, pole sequence, angular zero, working face and the measurement fixture, distance and temperature. GX can verify material properties, total flux, surface-flux distribution or waveform according to the agreed method.
How are TIR, air-gap consistency and balance controlled?
The drawing should identify the rotational datum, bearing seats, air-gap surface, TIR limit, balance planes and residual-unbalance or grade requirement. ISO 21940-11 can be referenced for rigid-rotor balance when agreed.
Can GX review wet-runner or high-speed rotor requirements?
Yes, as project-specific conditions. State the fluid, pressure, temperature, chemical exposure, rated and overspeed values, duty cycle and retention or leakage boundary. Overmolding, encapsulation, coating and speed tests are then confirmed rather than assumed.
What keeps samples and production batches consistent?
The released drawing and BOM, material grade and lot controls, approved process route and sample, measurement fixtures, control plan, sampling frequency and acceptance limits form the production baseline.
Which claims are reference data rather than guaranteed rotor values?
Material-grade data and prior project cases are feasibility references only. Finished-rotor flux, waveform, demagnetization, balance, retention and environmental results depend on geometry and test conditions and become commitments only when written into the approved specification.
Request for quotation
Request a Quote for a Permanent Magnet Rotor
Send the motor type, 2D/3D files, BOM, magnet and pole requirements, shaft or hub interfaces, operating limits, validation plan, sample quantity and annual demand.
- Rotor OD, length, air-gap surface, datums, fits and TIR
- Shaft, core, carrier, hub, sleeve, retention and supply boundary
- Material or grade, pole map, magnetic target and measurement condition
- Rated/maximum speed, balance, temperature, medium and duty cycle