Custom Qi2 Magnetic Ring Solutions for Stable Wireless Charging

Wireless charging products often fail for reasons that appear small during development: the magnetic ring is slightly off-center, the holding force is inconsistent, the housing creates too much distance, or the magnet begins losing performance after repeated heating.

These problems can lead to:

• Unstable phone attachment
• Charging-coil misalignment
• Slow or interrupted charging
• Excessive temperature rise
• Difficult product assembly
• Poor accessory compatibility
• Customer complaints and returns

A properly designed custom Qi2 magnetic ring assembly helps position the charging coils, control attachment force, and maintain consistent performance from prototypes to mass production.

This guide explains how OEM and ODM buyers can select and customize magnetic rings for wireless chargers, phone cases, power banks, car mounts, and other magnetic accessories.

Looking for a project-ready magnetic component?
View the MagSafe-Compatible Magnetic Ring Assembly for Wireless Chargers or send AIM Magnet your drawing for an engineering evaluation.

Quick Answer: What Makes a Reliable Qi2 Magnetic Ring?

A reliable Qi2-related magnetic ring should provide:

• Accurate ring-to-coil alignment
• Correct magnet polarity
• Consistent holding force
• Controlled inner and outer diameters
• Suitable magnet thickness
• Low assembly-position variation
• Stable performance at the operating temperature
• Compatible carrier and adhesive
• Reliable coating and corrosion protection
• Repeatable mass-production quality

The best magnetic ring is not necessarily the strongest one. It is the assembly that maintains accurate alignment, secure attachment, comfortable removal, and stable production quality inside the finished product.

What Is a Qi2 Magnetic Ring Assembly?

A Qi2 magnetic ring assembly is a circular magnetic component designed to help align a wireless charging transmitter and receiver.

A typical assembly may contain:

• Multiple NdFeB magnet segments
• A circular carrier
• A pressure-sensitive adhesive
• A release liner
• An orientation magnet
• A magnetic or structural back plate
• A protective or molded housing

The main magnetic ring helps place the phone and charger concentrically. The additional orientation magnet may prevent an accessory from rotating and help wallets, power banks, or stands remain in the intended direction.

The magnetic assembly does not generate charging power. Its primary function is mechanical attachment and positioning.

Why Standard Magnetic Rings May Not Fit Every Product

Standard magnetic rings can be useful for early prototypes, but they may not meet the requirements of every commercial product.

Different products have different:

• Internal spaces
• Coil diameters
• Housing thicknesses
• Phone-case structures
• Weight and load directions
• Pull-force requirements
• Operating temperatures
• Adhesive surfaces
• Camera clearances
• Compatibility targets

For example, a magnetic ring suitable for a thin phone case may not provide enough force inside a power bank with a thicker housing.

A ring designed for a desktop charger may also be unsuitable for a vertical car mount that must resist gravity, vibration, and road shock.

Customization allows the magnetic assembly to match the complete product instead of forcing the product to fit a generic ring.

Common Products That Use Custom Magnetic Rings

Custom wireless charging magnet rings can be used in:

• Qi2 wireless chargers
• MagSafe-compatible chargers
• Magnetic power banks
• Magnetic phone cases
• Car wireless charging mounts
• Desktop charging stands
• Multi-device charging stations
• Magnetic wallets
• Phone holders
• Charging docks
• Smart home control panels
• Portable electronic accessories

The magnetic structure should be optimized for the actual product rather than selected only by product category.

1. Align the Magnetic Ring With the Charging Coil

The most important requirement is the relationship between the magnetic ring and the charging coil.

If the ring is off-center, the phone may attach securely but place the transmitter and receiver coils in different positions. This can reduce power-transfer efficiency and contribute to unstable charging or additional heat.

The drawing should define:

• Charging-coil center
• Magnetic-ring center
• Ring-to-coil concentricity
• Orientation-magnet position
• Housing reference points
• Assembly position tolerance

Using one common datum for the coil and ring can reduce tolerance accumulation.

The final alignment should be verified in the complete product, not only on an individual magnetic component.

2. Select the Correct Ring Dimensions

Important magnetic-ring dimensions include:

• Outer diameter
• Inner diameter
• Radial width
• Magnet thickness
• Total assembly thickness
• Segment quantity
• Segment dimensions
• Segment spacing
• Orientation-magnet dimensions
• Carrier thickness
• Adhesive thickness

Market-standard rings may provide a starting point, but their dimensions should not automatically be treated as suitable for every MagSafe-style or Qi2-related product.

The final dimensions should match:

• Coil size
• Available internal space
• Housing structure
• Required working gap
• Target magnetic force
• Camera and component clearance

For products requiring a specially sized component, AIM Magnet provides custom magnetic rings for wireless charging phone cases and accessories.

3. Control the Working Air Gap

The working air gap is the total distance between the active magnetic surfaces.

It may include:

• Charger housing
• Phone housing
• Phone case
• Adhesive
• Carrier
• Coating
• Protective film
• Decorative layer
• Assembly clearance

Magnetic force decreases rapidly as this distance increases.

A magnetic ring tested directly against another magnet or steel plate may produce a much higher force than the same ring installed inside the finished product.

For accurate development, provide:

• Nominal working gap
• Minimum working gap
• Maximum working gap
• Material between the magnetic surfaces

Testing should reproduce the real product structure as closely as possible.

4. Choose a Suitable Magnet Grade

High-performance wireless charging assemblies normally use sintered neodymium magnets because they provide strong magnetic performance within limited space.

Possible grades include:

• N35
• N42
• N48
• N50
• N52
• Higher-coercivity H or SH grades

The correct grade depends on:

• Magnet dimensions
• Required holding force
• Working air gap
• Maximum magnet temperature
• Magnetic circuit
• Product lifetime
• Cost target

A higher grade is not automatically the best solution.

For products exposed to repeated charging heat, magnetic stability at elevated temperatures may be more important than maximum room-temperature strength. In these applications, N52H or another suitable high-coercivity grade may provide a larger resistance to irreversible demagnetization.

AIM Magnet’s Magnetic Shielding N52 MagSafe Ring is designed for wireless chargers and magnetic phone accessories requiring controlled magnetic performance.

5. Define the Correct Pole Arrangement

A segmented magnetic ring contains multiple magnets installed according to a defined polarity pattern.

Incorrect polarity can cause:

• Weak attraction
• Local repulsion
• Uneven magnetic force
• Incorrect phone positioning
• Poor accessory compatibility
• Rotation or lateral movement

The supplier should provide a polarity drawing before producing samples.

Production inspection may use:

• Magnetic viewing film
• Pole-detection equipment
• Hall-effect sensors
• Custom inspection fixtures
• Automated polarity inspection

Polarity should be verified on the complete assembly rather than assumed from the appearance of individual segments.

6. Specify the Target Holding Force

A magnetic ring must provide enough force to keep the device correctly positioned, but the force should not make the device difficult to remove.

The target force depends on:

• Product weight
• Use direction
• Working air gap
• Housing material
• Surface friction
• Mating structure
• User-removal method
• Vibration and shock
• Operating temperature

A desktop charger, phone case, power bank, and car mount should not automatically use the same pull-force specification.

Instead of requesting “the strongest possible ring,” define a force range under controlled test conditions.

The specification should include:

• Mating component
• Working gap
• Pull direction
• Test speed
• Test temperature
• Preload and dwell time
• Minimum and maximum force
• Sample quantity

For power-bank projects, see the dedicated MagSafe Magnet for Power Banks.

7. Select the Carrier and Adhesive

The carrier keeps the individual magnet segments in their correct positions.

A suitable carrier helps control:

• Segment spacing
• Ring concentricity
• Complete-ring flatness
• Orientation-magnet position
• Assembly speed
• Transportation stability

Possible carrier options include:

• PET carriers
• Plastic carriers
• Molded structures
• Adhesive-supported carriers
• Fully customized assembly frames

The adhesive should match the actual housing material, such as:

• ABS
• Polycarbonate
• Glass
• Aluminum
• Painted metal
• Composite materials

Adhesive qualification should consider:

• Surface preparation
• Assembly pressure
• Dwell time
• High temperature
• Humidity
• Thermal cycling
• Shear force
• Repeated attachment

A successful magnetic test does not guarantee product reliability if the ring later moves because of adhesive failure.

8. Consider Temperature and Corrosion Protection

Wireless charging systems may generate heat near the charging coil, battery, circuit board, and magnetic assembly.

Temperature can affect:

• Magnetic strength
• Resistance to demagnetization
• Adhesive performance
• Carrier dimensions
• Housing flatness
• Coating durability

The selected magnet grade should be based on the magnet’s actual operating temperature—not only the external housing temperature.

Sintered NdFeB magnets also require corrosion protection. Common coatings include:

• Nickel-copper-nickel
• Zinc
• Epoxy
• Nickel plus epoxy
• Customized protective coatings

For high-humidity or demanding applications, additional sealing, encapsulation, or plastic overmolding may be necessary.

9. Verify the Complete Wireless Charging System

A magnetic ring can improve alignment, but it cannot independently guarantee charging speed, efficiency, or certification.

The complete product should be evaluated for:

• Coil alignment
• Charging stability
• Charging power
• Temperature rise
• Foreign-object detection
• Ferrite shielding
• Battery temperature
• Sensor and NFC interaction
• Mechanical attachment
• Case compatibility
• User-removal experience

If charging performance is unstable, engineers should check the magnetic, mechanical, electrical, and thermal systems together.

Replacing the magnet with a stronger grade will not correct an incorrectly positioned coil, damaged ferrite sheet, unsuitable electronics, or poor heat dissipation.

10. Validate Samples Before Mass Production

Prototype validation should include:

• Dimensional inspection
• Polarity inspection
• Pull-force testing
• Ring-to-coil alignment
• Charging stability
• Temperature testing
• Adhesive testing
• Drop and vibration testing
• Repeated attachment cycles
• Compatibility testing

Whenever possible, compare several magnetic-force levels inside the same product structure.

This helps determine whether the design should use:

• A different magnet grade
• Greater or smaller thickness
• A modified pole arrangement
• A reduced working gap
• A different carrier
• Another adhesive
• A revised ring position

From Drawing to Mass Production

A practical custom magnetic-assembly project can follow this process:

Step 1: Application Review

The buyer provides the product drawing, intended application, available space, mating structure, working gap, temperature, and performance targets.

Step 2: Engineering Evaluation

The supplier reviews:

• Ring geometry
• Magnet grade
• Magnet thickness
• Pole arrangement
• Pull-force target
• Carrier and adhesive
• Assembly tolerances

Step 3: Drawing Approval

Both parties confirm:

• Dimensions and tolerances
• Material grade
• Coating
• Polarity
• Carrier
• Adhesive
• Test conditions
• Acceptance criteria

Step 4: Sample Production

Engineering samples are produced for magnetic, mechanical, charging, and thermal testing.

Step 5: Product Validation

The magnetic assembly is tested inside the actual charger, phone case, power bank, or accessory.

Step 6: Design Optimization

Dimensions, magnetic force, polarity, carrier, or adhesive are adjusted according to test results.

Step 7: Mass-Production Control

The approved sample, drawing, inspection report, packaging method, and batch-traceability requirements become the production reference.

Recommended RFQ Information

Send the following information when requesting a custom Qi2 magnetic ring:

If the final magnetic parameters are unknown, provide the product structure and performance target. AIM Magnet can help translate the application requirements into a practical magnetic specification.

Why Work With AIM Magnet?

AIM Magnet provides custom NdFeB magnets and magnetic assemblies for wireless charging and precision consumer-electronics applications.

Our support can include:

• Magnetic-ring dimension customization
• NdFeB grade selection
• Pole-arrangement development
• Target pull-force adjustment
• Orientation-magnet design
• Carrier and adhesive integration
• Prototype production
• Dimensional and polarity inspection
• Pull-force testing
• Mass-production quality control

For transmitter-side applications, phone cases, chargers, or power banks, buyers can select an existing product as a starting point and then customize the dimensions, force, material, and assembly structure.

Product Conversion Options

• MagSafe-Compatible Magnetic Ring Assembly for Wireless Chargers
• Custom Magnetic Ring for Wireless Charging Phone Cases
• MagSafe Wireless Charging Receiver Magnet Module
• MagSafe Magnet for Power Banks

Frequently Asked Questions

What is the best magnet for a Qi2 magnetic ring?

Sintered NdFeB magnets are commonly used because they provide strong magnetic output in a small space. The correct grade depends on the dimensions, force, air gap, temperature, and magnetic circuit.

Is N52 always required?

No. N52 provides high magnetic performance, but another grade may meet the target at a lower cost. Products with higher thermal risk may need a higher-coercivity grade rather than only a high-energy grade.

Can AIM Magnet customize the ring dimensions?

Yes. The outer diameter, inner diameter, thickness, segment quantity, orientation magnet, carrier, adhesive, coating, and pull force can be customized.

Can stronger magnets improve wireless charging?

Stronger magnets may improve mechanical attachment, but they do not directly increase charging power. Accurate coil alignment, electronics, shielding, distance, and thermal management determine charging performance.

How is pull force tested?

Pull force should be tested using a defined mating component, working gap, direction, speed, temperature, and sample quantity. Final validation should use the complete product.

Can a magnetic ring reduce overheating?

Correct magnetic alignment can help maintain efficient coil positioning and may reduce heat associated with misalignment. It cannot solve heat caused by poor electronics, damaged ferrite, foreign objects, battery problems, or inadequate cooling.

Is a loose magnet ring Qi2 Certified?

No. A loose magnetic component is not automatically Qi2 Certified. Certification applies to eligible complete products tested under the applicable Wireless Power Consortium requirements.

What information is needed to receive a quotation?

Provide the application, drawing, available space, coil position, working gap, target force, temperature, sample quantity, and annual demand.

Conclusion

A custom Qi2 magnetic ring should not be selected only by magnet grade, ring diameter, or advertised pull force.

The complete design must consider:

• Ring-to-coil alignment
• Ring dimensions
• Magnet thickness
• Pole arrangement
• Working air gap
• Target holding-force range
• Temperature stability
• Carrier and adhesive
• Manufacturing tolerances
• Finished-product charging performance

The correct solution is not the strongest magnet. It is a stable magnetic assembly that fits the product, maintains accurate alignment, provides comfortable attachment and removal, and can be produced consistently at scale.

Developing a wireless charger, magnetic phone case, power bank, or car mount? Send AIM Magnet your drawing, working gap, target force, temperature, and estimated volume for a custom magnetic-solution review.