Axial height
Check each end against the assembly envelope.
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Vincent@vanguard-tech.cn
Stator Manufacturing Quality
Control end-turn geometry, restraint and lead routing before the stator becomes an assembled motor.
Engineering Overview
The end winding is the portion of a stator coil outside the active core. It must fit inside the housing and clear endshields, bearings, rotor hardware and cooling features while keeping insulation and electrical connections intact. A neat-looking winding can still fail the drawing if a coil projects into a restricted area, a tie is loose, a lead touches a sharp edge or resin cure leaves a mobile conductor. Inspection must therefore combine geometry, visual condition and process evidence.
Check each end against the assembly envelope.
Keep copper and insulation clear of bore and housing.
Verify lacing, spacers and impregnation as specified.
Control bend radius, strain relief and edge contact.
Image Gallery
Examples from different motor topologies show why the inspection plan must match the actual winding and housing design.
Inspection Logic
End-turn shape may move during insertion, forming, tying, impregnation and cure. The accepted envelope should therefore be measured after the last shape-changing operation, not only on a dry-wound stator. Inspect both drive and non-drive ends. Use a gauge or fixture tied to functional assembly datums; a photo alone cannot prove millimeter-level clearance.
Inspect support details separately: ties or bands should be in their specified locations, spacers seated, connections insulated and resin coverage appropriate to the approved process. A porous-looking area or loose lacing calls for engineering review, but appearance alone should not be treated as an electrical test result.
Inspection Matrix
| Feature | Practical Check | Failure Mode Screened | Acceptance Basis |
|---|---|---|---|
| End-turn axial height | Height gauge or dedicated envelope fixture, both ends | Endshield or fan interference | Released assembly drawing |
| Inner radial projection | Go/no-go bore fixture after cure | Rotor insertion and rotation clearance | Rotor envelope plus tolerance stack |
| Outer radial projection | Housing-side profile or fixture check | Housing or cooling-channel interference | Housing assembly envelope |
| Coil support | Visual and approved gentle mechanical inspection | Loose ties, missing blocks or movement | Process specification and work instruction |
| Lead path | Trace from winding to terminal or connector | Pinch, abrasion or unsupported bend | Routing drawing and connector plan |
| Insulation condition | Visual plus approved electrical tests | Nicks, exposed conductors or winding faults | Motor-specific test plan |
Production Route
Release end-turn zones and inspection datums.
Record tooling, insertion and forming settings.
Verify ties, spacers and lead restraint.
Inspect after impregnation and cure.
Use the functional assembly envelope fixture.
Complete electrical tests and trace inspection results.
Troubleshooting
| Finding | Potential Contributor | First Investigation |
|---|---|---|
| One coil stands proud | Insertion or forming variation | Review tooling and slot position |
| End height drifts by batch | Forming setup or cure restraint change | Compare process records and fixtures |
| Lead rubs at housing entry | Routing, grommet or strain-relief issue | Assemble a worst-case stack-up |
| Loose end-turn bundle | Missing tie, support movement or poor cure | Inspect support work instruction and resin process |
| Insulation scuffed after assembly | Undetected interference or sharp edge | Inspect contact witness and mating component |
Engineering Support
For a new stator program, define a common datum chain from lamination stack to winding fixture, housing and rotor envelope. A single final end-height number rarely captures all interference risks. Prototype assemblies should be checked at worst-case component combinations and reviewed after thermal and vibration testing when the duty demands it.
Ningbo Vanguard Technologies supports stator components, winding-related manufacturing review, motor prototyping and process control. We can help translate the assembly envelope into practical fixtures and inspection records for repeatable production.
FAQ
For engineering, quality and purchasing teams.
Measure at the released process state, typically after forming, support placement and cure, because each can change the final winding envelope.
No. Visual inspection finds damage or missing support; a fixture or measurement tied to assembly datums verifies dimensional clearance.
Not by itself. Verify the approved support features and process controls, then use the motor-specific validation plan.
Yes. Housing, fan, bearing and connection features can differ at the drive and non-drive ends.
Follow the drawing and gauge procedure. Do not reshape or rework a released winding without an approved disposition and subsequent electrical verification.
Share your stator and mating-component drawings for an inspection and manufacturability review.
