Magnetic Testing and Field Mapping

Magnetic inspection planning for injection molded magnet parts, including B-H review, flux checks, pole mapping, and functional sensor-output validation.

Best Fit For:Best for engineering and quality teams that need measurable magnetic acceptance criteria before tooling or PPAP sampling.

Multipole magnetic ring for field mapping

Capability Highlights

Inspection plan support for flux density, pole pitch, angle error, and field uniformity
B-H curve, hysteresisgraph, VSM, or supplier material data review by project stage
3-axis field mapping discussion for Bx, By, Bz, sensing radius, and production acceptance

Typical Engagement Scope

Automotive sensor rotors
Multipole motor rings
Resolver and encoder targets
Material grade qualification

Execution Focus

Define whether the release gate is material data, gauss value, field map, angle error, torque, or functional sensor output
Align pole count, sensing radius, datum, fixture, and measurement repeatability before sample release
Use IEC 60404-5, ASTM A977, or buyer-specific test methods when required by the program

Program Review Path

Where Magnetic Testing and Field Mapping fits

Magnetic Testing and Field Mapping is most relevant when best for engineering and quality teams that need measurable magnetic acceptance criteria before tooling or PPAP sampling. Typical oem capability programs include Automotive sensor rotors, Multipole motor rings, and Resolver and encoder targets, so the early review should confirm define whether the release gate is material data, gauss value, field map, angle error, torque, or functional sensor output.

What to lock before samples

Before sample tooling, align on 2D/3D drawing, material target, magnetic pattern, and sensing datum and operating temperature, vibration, media exposure, and lifetime requirement. The first acceptance check is magnetic release criterion (B-H curve, flux density, Bx/By/Bz map, angle error, or functional output), because the magnet can only be controlled in production when the buyer defines which magnetic characteristic matters.

How to reduce sourcing risk

The main risk is brittle sintered magnet carried into a vibration-critical assembly; control it by review bonded magnet material and molded geometry when chipping, cracking, or adhesive failure can affect functional safety. Also review pole geometry and magnetic pattern accepted without measurable criteria before moving from prototypes to repeat production.

Program Evaluation Matrix

Program Metric	Typical Range	Procurement Value
Magnetic release criterion	B-H curve, flux density, Bx/By/Bz map, angle error, or functional output	The magnet can only be controlled in production when the buyer defines which magnetic characteristic matters.
Pole geometry	Pole count, pole pitch, phase angle, flux peak, and reference datum	Multipole magnets fail by pattern error as often as by material output shortage.

RFQ Preparation Checklist

2D/3D drawing, material target, magnetic pattern, and sensing datum
Operating temperature, vibration, media exposure, and lifetime requirement
Sample quantity, tooling target, annual forecast, destination, and PPAP needs
Required magnetic test method, sensing radius, pole map format, datum reference, and acceptance limits

Risk and Mitigation

Brittle sintered magnet carried into a vibration-critical assembly: Review bonded magnet material and molded geometry when chipping, cracking, or adhesive failure can affect functional safety.
Magnetic pattern accepted without measurable criteria: Define flux density, pole count, angle error, sensing radius, concentricity, and inspection method before sample tooling.
Sample approved by a handheld gauss reading only: For sensor and motor programs, define a fixture, measurement radius, orientation, and data format that match the final function.

Related Products

Buyer FAQ

Do you need a complete magnetic field map for every RFQ?

No. Early RFQs can start with pole count, air gap, and target output, but production release should define the magnetic inspection method clearly.

What should be included in a Magnetic Testing and Field Mapping RFQ?

Include 2D/3D drawing, material target, magnetic pattern, and sensing datum, operating temperature, vibration, media exposure, and lifetime requirement, and sample quantity, tooling target, annual forecast, destination, and PPAP needs. If the part is tied to automotive or safety-critical sensing, also include PPAP, traceability, and magnetic test expectations.

Related Resources

Inquiry Email

[email protected]

Email app

Include drawing, material, pole pattern, temperature, compliance, and PPAP needs.

Instant Chat

+8618857971991

Chat on WhatsApp

Fast DFM triage for magnetic material, tooling, and validation questions.

Execution Focus

Define whether the release gate is material data, gauss value, field map, angle error, torque, or functional sensor output

Align pole count, sensing radius, datum, fixture, and measurement repeatability before sample release

Use IEC 60404-5, ASTM A977, or buyer-specific test methods when required by the program

Program Review Path

Where Magnetic Testing and Field Mapping fits

What to lock before samples

How to reduce sourcing risk

Program Evaluation Matrix

Program Metric	Typical Range	Procurement Value
Magnetic release criterion	B-H curve, flux density, Bx/By/Bz map, angle error, or functional output	The magnet can only be controlled in production when the buyer defines which magnetic characteristic matters.
Pole geometry	Pole count, pole pitch, phase angle, flux peak, and reference datum	Multipole magnets fail by pattern error as often as by material output shortage.

RFQ Preparation Checklist

2D/3D drawing, material target, magnetic pattern, and sensing datum

Operating temperature, vibration, media exposure, and lifetime requirement

Sample quantity, tooling target, annual forecast, destination, and PPAP needs

Required magnetic test method, sensing radius, pole map format, datum reference, and acceptance limits

Risk and Mitigation

Brittle sintered magnet carried into a vibration-critical assembly: Review bonded magnet material and molded geometry when chipping, cracking, or adhesive failure can affect functional safety.

Magnetic pattern accepted without measurable criteria: Define flux density, pole count, angle error, sensing radius, concentricity, and inspection method before sample tooling.

Sample approved by a handheld gauss reading only: For sensor and motor programs, define a fixture, measurement radius, orientation, and data format that match the final function.

Buyer FAQ

Do you need a complete magnetic field map for every RFQ?

No. Early RFQs can start with pole count, air gap, and target output, but production release should define the magnetic inspection method clearly.