Motor components
Rotor assemblies with a defined supply scope
EMTXI arranges sourcing of rotor assemblies for industrial motors and actuators. The starting point is your assembly drawing, bill of materials and acceptance requirements. We clarify the scope with the proposed producer and coordinate the quotation, samples and agreed documentation. An assembly quotation is specific to the design; it is not a claim of an existing qualified motor platform.
Start with the assembly boundary
List the magnet parts, carrier or rotor bell, shaft and any other included items by part number and revision. Separate supplied components from assembly operations. State whether the delivery is an unmagnetised subassembly, a magnetised rotor or another defined state.
Identify customer-supplied components and documents, and agree responsibility for their acceptance. A complete bill of materials prevents a loose-component quotation from being mistaken for a finished assembly offer. Motor component kits are a separate option when assembly remains with the customer.
Control the interfaces and process requirements
The approved documentation should identify the dimensional datums, component orientation and final assembly characteristics to be inspected. Specify permitted joining materials and processes, marking and cleanliness requirements, and any restrictions on substitution. Process changes require the agreed review before production is released.
Magnet grade, coating, direction and delivery state belong in the controlled specification. Include the approved magnet drawings rather than relying on a commercial grade name alone. Our magnetisation guide explains the distinction between direction and delivered state.
Agree verification before producing samples
Define the first-article inspection and the tests needed for acceptance. Depending on the specified scope, the evidence may include dimensions, component traceability, a magnetic inspection or an agreed balancing report. The quotation must identify what is included, what is provided by the producer and what remains a customer test.
The ISO 21940 series addresses rotor balancing; the applicable part and acceptance requirements must be selected for the actual rotor. A generic reference to the series is not a balance certificate. EMTXI does not assign operating-speed, lifetime or motor-performance ratings to an unqualified assembly.
Keep the approved route identifiable
Recurring deliveries need a traceable link between the assembly lot, the relevant component lots and the released drawing revision. Agree how changes to the producer, material or assembly process are notified, and what triggers requalification.
If origin evidence is required, define whether it applies to the assembly operation, each component or upstream materials. Final assembly in one country does not establish the origin of every input. See origin and traceability.
For a quotation, provide the controlled drawings, bill of materials, sample quantity, demand forecast, inspection requirements, packaging and delivery location. A volume programme can then define release dates and documentation against an approved route; capacity remains subject to written confirmation.
Buyer questions
Can the package include magnets, carrier and shaft?
Yes, these can be included in a sourcing enquiry. Identify which components are to be supplied and which are customer-supplied, together with the assembly operations and final acceptance scope. Feasibility is confirmed per design.
Are assembled rotors automatically balanced?
No. Balancing must be specified and included in the quotation. Define the applicable procedure, acceptance criterion, delivery configuration and reporting requirements with the responsible design team.
Does an approved magnet qualify the complete rotor?
No. Component approval does not establish conformity of the assembled rotor or the finished motor. Assembly inspection and the customer's application qualification remain separate steps.
Sources and further reading
EMTXI · Reviewed
Your next step
Send the assembly drawing, bill of materials and required acceptance documentation.