Can this tool rank automotive traction motor suppliers?

No. It creates a screening brief from your inputs; it does not search companies or verify a supplier’s capacity, certification, quality, price, or suitability. Validate candidates directly against your program requirements.

Is IATF 16949 required for every motor supplier?

Do not treat it as a universal rule. Requirements depend on the OEM, supplier role, product scope, and program-specific requirements. Check the current customer requirements and the certificate scope for the quoted site.

What evidence should I request from an EESM supplier?

Request the proposed rotor winding and excitation process, insulation approach, balance and speed validation, production test plan, and evidence that applies to the named manufacturing site. The specific controls depend on the design.

Does every 800V motor need end-of-line partial-discharge testing?

This page does not prescribe a universal test. Agree whether partial-discharge measurement is relevant, and define its method and acceptance limits from the insulation design, converter stress, customer requirements, and validation plan.

What belongs in a traction motor RFQ besides peak power?

Include continuous and peak torque/speed, voltage, duty cycle, cooling conditions, package limits, environment, annual and peak-period volume, ramp timing, validation scope, and the customer’s quality and safety deliverables.

Are the annual-volume bands in the tool industry standards?

No. They are broad planning bands to shape supplier questions, not market benchmarks or capacity limits. Feasibility depends on the design, sourcing route, plant, and ramp profile.

Are my selections sent or stored when I run the check?

No. The checklist is calculated in your browser. Choosing the contact action opens a prefilled email in your email application; nothing is sent until you review and send it.

Automotive Traction Motor Supplier

Build a screening brief and evidence checklist for PMSM, EESM, or induction motor suppliers.

Prepared by Magnet-Free Motor Engineering Team · Published 2026-10-12 · Reviewed 2026-10-12

Supplier Screening Brief

Choose three inputs to build a local checklist of supplier evidence to request.

This browser-only checklist does not search or qualify suppliers. Your selections are not sent or stored. Contact opens a prefilled email; you review and send it yourself.

Key Considerations for Supplier Sourcing

Use a common operating envelope and ask each quoted site for evidence tied to the proposed design. These are screening prompts, not a supplier ranking or universal compliance checklist.

Ask for process evidence that matches the proposed topology.

PMSM, wound-field synchronous (EESM), and induction designs use different rotor approaches. Ask the quoted plant to show its actual process route, controls, and validation for your design; do not assume one winding, magnet, or casting process fits every motor.

Source Context: U.S. DOE: wound-field traction motor research

Define insulation validation with the motor and inverter together.

Agree the insulation test method and acceptance limits against the winding design, inverter waveform, cable and filter, operating temperature, and program requirements. Partial-discharge measurement is one available method for relevant converter-fed machine insulation; it is not a universal 800V EOL requirement.

Source Context: IEC TS 60034-27-5:2021 scope

Check quality-system evidence against the customer and site scope.

Request the certificate, covered activities, manufacturing location, and applicable OEM customer-specific requirements. A certificate or audit result at another location does not by itself establish that the quoted site and product scope meet your program needs.

Source Context: IATF customer-specific requirements register

Compare total system trade-offs using one shared duty cycle.

Topology labels alone do not determine efficiency, cost, or supply risk. Give each candidate the same torque-speed envelope, duty cycle, cooling, package, voltage, volume, and ramp assumptions, then compare validated data and costed process assumptions.

Source Context: RFQ comparison method on this page

Supplier scope for automotive traction motor programs

Magnet-Free Motor’s published OEM scope covers build-to-print and DFM review, lamination stacks, hairpin stators, wound rotors, insulation and impregnation, balancing, assembly, and prototype-to-production transfer. Whether a complete-motor or component package fits your program depends on the design, named site, customer quality scope, and production plan.

Review OEM manufacturing capabilities

Supplier Evidence by Motor Topology

The process route and validation depend on the design and customer. Use these dimensions to make RFQ responses comparable.

Swipe horizontally to compare the evidence questions.

Topology	Design question	Process evidence to request	Validation evidence to request
EESM (Externally Excited)	Wound rotor and the selected excitation arrangement.	Ask for the proposed rotor winding, excitation, insulation, and balancing process.	Request design-specific insulation, excitation, speed, and thermal validation records.
PMSM (Permanent Magnet)	Magnet sourcing, retention, and the selected rotor construction.	Ask for magnet traceability, retention controls, and the actual stator/rotor process route.	Request the agreed electrical, mechanical, thermal, and end-of-line validation plan.
ACIM (Induction)	Rotor conductor design, losses, and thermal performance for the duty cycle.	Confirm whether the rotor cage is cast, fabricated, or sourced, and how that route is controlled.	Request the agreed rotor-quality, balance, electrical, and thermal validation plan.

Ready to compare candidates? Share the operating envelope and site evidence scope for an initial RFQ discussion.

Prepare your supplier RFQ

Evidence and Source Scope

Reviewed 2026-10-12. These primary references support the limited points noted below; they do not certify or rank any supplier. Confirm current standards, customer requirements, and acceptance criteria for the specific program.

U.S. Department of Energy — Wound-field and hybrid synchronous machines for EV traction
Primary research context for wound-field synchronous traction motor architectures and excitation approaches.
International Automotive Task Force — Customer-Specific Requirements
The IATF portal publishes separate customer-specific requirement documents; confirm the current OEM and program scope.
IEC TS 60034-27-5:2021 — Partial-discharge inception voltage measurement
Defines an off-line measurement method for partial-discharge inception and extinction voltage under repetitive impulse voltage for relevant converter-fed rotating machines.

Supplier Sourcing Risks

Treat these as program risks to investigate. The right controls depend on the motor design, supplier role, customer, and production site.

Swipe horizontally to compare each risk and mitigation.

Risk Profile	Potential impact	Mitigation Strategy
Topology or process mismatch	A supplier may quote a familiar process that does not match the proposed rotor, excitation, or stator design.	Review the plant-specific process flow, control plan, and validation evidence against the released design.
Prototype-to-series gap	A hand-built sample does not establish repeatable cycle time, process capability, or ramp capacity.	Request a production-intent process flow, capacity assumptions, validation plan, and launch milestones.
Quality scope does not match the program	A quality certificate may not cover the quoted location, activity, or customer-specific requirements.	Verify the certificate scope and named site, then check the target OEM requirements for this supplier role.
Insulation test conditions miss converter stress	A test plan that omits the actual converter waveform or operating conditions may miss relevant insulation stress.	Agree test methods, conditions, and acceptance limits with the motor, inverter, and vehicle engineering teams.
Quoted prices use different cost boundaries	Unit-price comparisons can hide tooling, validation, material assumptions, ramp costs, or yield expectations.	Use one volume and duty-cycle baseline, and request a cost breakdown with tooling, validation, material, and ramp assumptions stated separately.

Frequently Asked Questions

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Need technical sizing first? Read our automotive traction motor guide.