Magnetic Compound
Br 0.20–0.78 T · Hcb 160–520 kA/m · Hcj 400–1,120 kA/m — bonded ferrite or bonded NdFeB selected by output and temperature.
Motor Rotor · Bonded Magnet System
Bonded Magnet Rotor Manufacturer
GX Magnet supplies drawing-defined bonded magnet rotors using injection-molded or compression-bonded magnetic systems where the project requires multipole geometry, integrated inserts, controlled pole position and repeatable rotor interfaces.
- Bonded ferrite or bonded NdFeB material reviewed by application
- Pole count, waveform, insert, sleeve and shaft interface defined by drawing
- Approved samples and magnetic inspection criteria govern recurring production
Drawing variables
Define the Bonded Rotor Around Magnetic and Molding Requirements
Magnetic compound, rotor geometry, inserts, magnetization and operating conditions must form one manufacturable specification.
Engineering data
Bonded Magnet Rotor Review Parameters
The specification is confirmed from the bonded material system, molding route, insert design, pole map, operating speed, environment and validation plan.
| Parameter | Specification / Review Basis |
|---|---|
| Structure / Supply Scope | 2–64 poles · injection or compression route — magnetic ring/sleeve or shaft/hub/insert-integrated bonded rotor. |
| Magnetic Compound | Br 0.20–0.78 T · Hcb 160–520 kA/m · Hcj 400–1,120 kA/m · (BH)max 12–92 kJ/m³ — bonded ferrite and bonded NdFeB supply envelope; values are not simultaneous. |
| Dimensions / Inserts | OD Ø8–120 mm · ID Ø2–80 mm · length 5–80 mm · shaft Ø2–30 mm · fits IT6–IT9 — final insert and overmold geometry follows the drawing. |
| Poles / Magnetic Output | 2–64 poles · radial / axial / multipole · pole position ±1°–±3° — flux and waveform use an agreed fixture, distance and temperature. |
| Geometric Accuracy | Concentricity 0.02–0.15 mm · TIR 0.03–0.20 mm · Ra 0.8–3.2 μm — molding datum and air-gap surface are inspected together. |
| Mechanical / Rotational | Retention 30–2,000 N · torque 0.05–50 N·m · balance G1–G6.3 · rated ≤15,000 rpm · maximum ≤20,000 rpm — limits depend on binder, insert and wall section. |
| Environment / Acceptance | Maximum operating 100–150°C · salt spray 24–240 h · overspeed 1.2× · AQL 0.65–1.5 — final exposure and sampling plan are project-defined. |
Typical review ranges only. Magnetic values vary by compound and density; final rotor limits follow the approved material, drawing, sample and test conditions.
Project screening
What Buyers Should Define Before a Bonded Magnet Rotor RFQ
A bonded rotor review starts with magnetic compound, molding route, pole pattern, mechanical insert and operating conditions—not only outside dimensions.
- Product form
- Bonded magnetic rotor, molded magnet ring or insert-integrated rotor
- Material route
- Bonded ferrite or bonded NdFeB reviewed against magnetic and environmental targets
- Design focus
- Pole geometry, insert bonding, rotor runout, retention and working air gap
- Required input
- 2D/3D drawing, magnetic target, pole map, speed, environment and annual demand
Product and supply scope
What Is a Bonded Magnet Rotor?
A bonded magnet rotor uses magnetic powder combined with a polymer binder, then molded or compacted into a rotor geometry. This route can support multipole patterns, thin sections, integrated inserts and shape control that may be difficult with separately assembled sintered magnets.
GX evaluates bonded ferrite and bonded NdFeB routes by project. Magnetic output, temperature, mechanical strength, moisture exposure, insert design, magnetization and production volume must be reviewed together before a material or process is confirmed.
Drawing-based supplyRotor envelope, magnetic body, insert, sleeve, shaft features and datums are fixed before sample release.
Compound reviewMagnetic powder, binder system and molding route are selected against output, temperature and mechanical needs.
Magnetization approvalPole count, pole position, waveform or functional response follows an approved sample and test method.
Separate scopeUnconfirmed stators, bearings, electronics and complete motor assembly are not implied.
Advantage products
Product Area - Used in the Automotive Industry
Four bonded magnet product cases optimized for web presentation, showcasing the original product, waveform data, and detailed engineering analysis visuals.
Case 01
Angle sensor
- Purpose: Angle sensor
- During injection molding, the product is magnetized on a flat surface with a saddle shaped waveform;
- Using hot to cold flow channels for production;
- Using mold flow analysis to optimize the mold and process;
- Adopting automated full inspection of magnetic flux;
- Perform operations in a clean room to ensure the cleanliness of the product.
Case 02
Steering wheel audio switch
- Purpose: Steering wheel audio switch;
- The magnet has 12 radial poles and an outer diameter of 8mm;
- It is produced through two-stage injection molding, first injecting the magnet, then injecting the component;
- Modelling analysis is used to optimize the mold and process;
- Magnetic simulation software is employed to simulate and calculate the magnetic performance, thereby avoiding risk points in the design.
Case 03
Sliding door
- Purpose: Sliding door
- Injection NdFeB magnet
- Planar magnetizing 64 poles
- Using mold flow analysis to optimize the mold and process;
Case 04
Dish-washing machine
- Purpose: Dish-washing machine;
- 8 poles, the waveform is sine wave;
- The balancing planes≤15mg;
Project route
From Bonded Rotor Review to Controlled Production
GX connects compound selection, molding structure, inserts, magnetization and inspection to one approved rotor definition.
Requirement Review
Drawing, motor type, magnetic target, pole map, speed, environment and demand are checked.
Compound Selection
Bonded ferrite or bonded NdFeB and binder route are evaluated against the application.
Tooling and Insert Review
Mold split, shrinkage, insert retention, gates and critical datums are defined.
Molding / Forming
The magnetic body and approved insert structure are produced under controlled process conditions.
Magnetization and Testing
Pole pattern, waveform, dimensions, runout and agreed mechanical results are verified.
Production Control
Approved drawing, sample, process window and inspection plan govern recurring batches.
Verification
Verify Magnetic Pattern, Molded Geometry and Rotor Function
The inspection plan connects the molded magnetic body and insert geometry to pole position, runout, retention and motor function.
| Inspection item | Control approach | Why the buyer needs it |
|---|---|---|
| Molded dimensions | Critical dimensions, bore, OD, datums and insert position checked by agreed methods | Controls fit and air-gap consistency |
| Concentricity / runout | Magnetic surface and shaft or insert datum evaluated where specified | Supports stable rotation |
| Magnetic output | Flux, waveform or agreed functional property checked under defined conditions | Confirms material and magnetization |
| Pole position | Pole count, sequence and circumferential position verified to the approved map | Prevents commutation error |
| Retention / appearance | Insert security, cracks, flash, joints and contamination evaluated | Reduces mechanical and assembly risk |
Application fit
Where Bonded Magnet Rotors Fit OEM Designs
Bonded magnet rotors fit projects that need multipole control, compact geometry, integrated inserts or repeatable magnetic positioning.
Automotive Actuators
Compact rotors reviewed for pole position, temperature, insert retention and recurring volume.
Pump and Valve Motors
Moisture, chemicals, sealing interfaces, speed and magnetic response are defined by project.
Encoders and Sensors
Pole pitch, waveform, concentricity and installed air gap guide acceptance.
Compact BLDC Motors
Rotor geometry, multipole magnetization, runout and mating-stator fit are reviewed together.
Quality-system support
Quality-System Support for Bonded Magnetic Rotors
GX Magnet applies drawing revision, material control, sample approval and project-defined inspection planning to bonded rotor programs.
Revision Control
Magnet geometry, mechanical datums, pole layout, retention and appearance follow the approved drawing revision.
Sample Approval
Prototype dimensions and agreed magnetic, fit, runout or balance checks are recorded before recurring production.
Production Inspection
Inspection scope and sampling expectations are aligned before quotation and release.
Project-specific inspection records and magnetic performance data can be provided during sample approval or project review, based on the approved drawing and agreed acceptance criteria.
Buyer communication
Discuss Bonded Magnet 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 bonded magnet rotor drawing and mating-component information. The discussion can identify supply boundaries, interface risks and RFQ inputs 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 combines ferrite-material experience, magnetic-component capability and drawing-based rotor project support for automotive, appliance, pump, HVAC and industrial applications.
Material and Structure Review
Magnet material, pole layout, rotor structure and retention are reviewed against the application.
Drawing-Based Projects
Interfaces, samples and inspection criteria are controlled from approved revisions.
OEM Communication
Engineering and sourcing teams receive a clear RFQ input list and project-specific supply boundary.
30+ Years Serving Clients Worldwide
FAQ
Bonded Magnet Rotor Sourcing Questions
Answers to the drawing, material, interface, validation and recurring-supply questions buyers normally resolve before approving a custom rotor source.
When is a bonded magnet rotor preferable to a sintered-magnet rotor?
A bonded route is usually considered when the design needs complex geometry, thin sections, integrated inserts, controlled multipole positioning or reduced secondary assembly. Magnetic output, temperature capability and mechanical needs still have to be checked against the motor target.
How do we choose between bonded ferrite and bonded NdFeB?
Selection depends on the required magnetic output, operating temperature, moisture or chemical exposure, rotor volume, mechanical load and cost. GX reviews the compound and binder system from the application rather than from the product name alone.
Can the magnet be molded directly around a shaft or metal insert?
Yes, subject to review of insert material, surface condition, knurl or undercut, wall thickness, molding shrinkage, torque transfer, runout datum and retention validation. The insert drawing is required for quotation.
Can GX control multipole pole position and waveform?
Pole count, direction, circumferential position and the agreed waveform or flux response can be controlled against an approved pole map, fixture relationship, air gap and sample.
How are molding shrinkage, concentricity and rotor runout controlled?
Critical dimensions must reference a clear datum scheme. Tooling compensation, insert location, process control and sample measurement are then aligned with the bore, OD and working-air-gap surfaces.
What temperature, moisture and chemical data are needed?
Provide continuous and peak temperature, duty cycle, moisture or fluid exposure, chemicals, storage condition and required validation. These inputs affect the compound, binder, insert interface and test plan.
How is insert retention or overspeed risk validated?
The buyer should define rated speed, maximum or overspeed condition, torque load, temperature and acceptance criteria. GX then reviews a project-specific retention or mechanical validation route before sample approval.
What should be included in a bonded magnet rotor RFQ?
Send 2D/3D drawings, magnetic target, preferred material if known, pole map, insert or shaft drawing, critical datums and tolerances, speed, environment, sample quantity and annual demand.
Request for quotation
Request a Quote for a Bonded Magnet Rotor
Include the rotor drawing, bonded material target, pole layout, insert or shaft interface, speed, environment, sample quantity and annual demand.
- Rotor OD, bore, length, datums and critical molded dimensions
- Bonded ferrite or bonded NdFeB target and operating temperature
- Insert, shaft, sleeve or overmold interface and retention features
- Pole map, waveform, runout, speed and validation method