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Help CenterOEM PA/PPS Injection Molded Magnet Ring Rotor for Motor Assembly, Ferrite/NdFeB, +/-0.02mm Precision
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As a professional manufacturer specializing in precision injection molded magnet components, Changzhou Hongxinyutai Precision Mold Co., Ltd. (established 2017, 51-100 employees, 1,000-3,000 sqm factory) proudly presents our OEM PA/PPS Injection Molded Magnet Ring Rotor for Motor Assembly. This rotor integrates high-performance ferrite or NdFeB magnets into a durable PA6 or PPS carrier via advanced injection molding, achieving a tight tolerance of ±0.02mm. Designed for high-efficiency motor applications such as BLDC, PMSM, and servo motors, our ring rotor offers consistent magnetic field distribution, mechanical stability, and cost-effective mass production. Whether you need a standard design or a fully customized solution, our team ensures reliable quality backed by TS16969 process control.
Key Features & Technical Specifications
- Material Options: PA6 (nylon) or PPS (polyphenylene sulfide) for the plastic carrier, offering excellent heat resistance, chemical resistance, and dimensional stability. Magnet materials: Ferrite (ceramic) or NdFeB (rare earth) – both can be customized for magnetic strength, orientation, and coating.
- Precision Tolerance: ±0.02mm on critical dimensions (OD, ID, thickness, concentricity). This ensures minimal air gap variation and consistent motor performance.
- Magnetizing & Testing: Rotors are fully magnetized with multi-pole patterns (e.g., 4-pole, 8-pole, 16-pole) as per customer requirements. Magnetic flux density, pole angle, and harmonic distortion are measured and reported.
- Molding Process: Injection overmolding of magnets with PA or PPS, providing strong bond between magnet and plastic, eliminating loose magnets, and enabling complex geometries (e.g., undercuts, ribs, mounting holes).
- Product Types: Ring rotors (inner or outer ring), disc rotors, segmented rotors, and custom shapes. Suitable for rotor diameters from 10mm to 150mm (or larger upon request).
| Parameter | Typical Value / Range | Remarks |
|---|---|---|
| Outer Diameter (OD) | 20 – 120 mm | Customizable |
| Inner Diameter (ID) | 5 – 80 mm | Customizable |
| Thickness | 3 – 30 mm | Customizable |
| Magnet Material | Ferrite (Y30, Y35) / NdFeB (N35-N52, etc.) | Grade & coating optional |
| Plastic Material | PA6, PA66, PPS, PBT | Heat deflection temperature up to 260°C (PPS) |
| Magnetic Poles | 2, 4, 6, 8, 12, 16, 24, etc. | Customizable |
| Precision (Tolerance) | ±0.02 mm (standard) | Tighter tolerance available on request |
| Operating Temperature | -40°C to +150°C (PA), -40°C to +240°C (PPS) | Depending on material |
Advantages & Customer Benefits
- High Dimensional Consistency: Our injection molding process with automated quality control ensures every rotor meets ±0.02mm tolerance, reducing motor assembly time and scrap.
- Strong Bonding & Durability: Overmolding eliminates the need for gluing or mechanical retainers, preventing magnet detachment under high RPM or vibration.
- Design Flexibility: We can integrate features like keyways, balancing holes, or sensor mounting slots directly into the plastic part, simplifying your motor assembly.
- Cost-Effective Mass Production: Multi-cavity molds and optimized cycle times (30-60 seconds per part) allow competitive pricing for high-volume orders.
- Comprehensive Testing: Each rotor undergoes dimensional inspection, magnetic flux measurement, and pull-force testing (if required). Reports are provided with each shipment.
Tailored Solutions for Your Application
Our OEM service covers everything from magnetic circuit design, mold development, prototyping, to mass production. We work with customers in North America, South America, Europe, Asia, and Africa, serving industries such as automotive (e.g., electric power steering, cooling fans, oil pumps), industrial automation, home appliances, medical devices, and robotics. With TS16969 certification, our quality system ensures rigorous process control and traceability.
Trust & Delivery
Since 2017, Changzhou Hongxinyutai Precision Mold has built a reputation for reliable magnet rotor manufacturing. Our 1,000-3,000 sqm facility houses advanced injection molding machines (30-200 ton), automatic magnetizing stations, and CMM inspection equipment. With a team of 51-100 experienced professionals, we can handle both small-batch prototypes and large-scale production (up to 500,000 pcs/month). We ship from Jiangsu, Shanghai, or Shenzhen ports with lead times typically 4-6 weeks for new tooling, 2-3 weeks for repeat orders. We invite you to contact us for a quotation or technical discussion — let us help you optimize your motor performance with precision injection molded magnet ring rotors.
Frequently Asked Questions
Q1: What is the minimum order quantity (MOQ) for this rotor?
A: MOQ depends on the complexity and size. For standard ferrite rotors, MOQ is typically 1,000 pcs; for NdFeB rotors, 500 pcs. Prototype orders (10-100 pcs) are available with a separate mold charge. Please discuss your specific needs with our sales team.
Q2: Can you achieve tighter tolerance than ±0.02mm?
A: Yes, we can achieve ±0.01mm on certain dimensions (e.g., OD, ID) after secondary operations or using advanced mold technology. However, tighter tolerances may affect cycle time and cost. We recommend confirming your required tolerance during the design phase.
Q3: What is the difference between PA and PPS as carrier material?
A: PA (nylon) offers good mechanical strength, wear resistance, and cost-effectiveness, with max operating temperature around 120-150°C. PPS provides higher heat resistance (up to 240°C), excellent chemical resistance, and lower moisture absorption, but is more expensive. Choose based on your motor's thermal environment and budget.
Q4: How do you ensure the magnets are correctly positioned during molding?
A: We use custom-designed fixtures and insert placement robots (or manual placement with fixtures) to position magnets precisely. The mold design includes locating pins and cavities that hold magnets in place during injection. Post-molding inspection using vision systems and magnetic field mapping validates the final position.
Q5: Can you provide magnetic simulation or design assistance?
A: Yes, our engineering team can assist with finite element analysis (FEA) for magnetic circuit design, pole optimization, and cogging torque reduction. We can work with your motor specs to develop the optimal rotor design. This service is available for OEM projects with a signed NDA.
Q6: What certifications does your company hold?
A: We are certified under TS16969 (automotive quality management system). Additional certifications like ISO 9001 or IATF 16949 can be provided upon customer request, though we currently operate under TS16969. Our quality system includes PPAP, FMEA, and control plans.
Q7: How long does tooling development take, and what is the cost?
A: Typical mold development time is 4-6 weeks for simple designs, 8-10 weeks for complex multi-cavity or insert molds. Tooling cost ranges from $3,000 to $15,000 depending on cavity count, material, and complexity. We offer a cost-sharing model for high-volume contracts.
Q8: Do you offer samples before mass production?
A: Yes, we provide samples (usually 10-50 pcs) from first-shot trials or from the qualified mold. Sample lead time is 2-3 weeks after mold completion. We can also send existing standard rotors for performance evaluation if they match your requirements.
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