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Axial-flux stator plates: Ø90 9-coil and Ø70 6-coil
How do I wire a 9-coil 3-phase axial flux stator? · Hardware · basis: Coreless 3-phase stator: coils = 3/4 of poles (12 pole / 9 coil, 8 pole / 6 coil), Ø13 pockets for the bobbin flanges, M3 holes at ISO 273 clearance
Long Earth Society build part. The flywheel alternator on the LES generator builds. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 2 in table
Notes
- The Ø90 stator is a 4 mm plate with 9 Ø13 through pockets on a Ø72 circle, a Ø14 centre hole the Ø8 shaft passes without contact, and 3 × Ø3.4 (M3) mounting holes on a Ø86 circle.
- The Ø70 stator has 6 Ø13 pockets on a Ø52 circle, the same Ø14 centre hole and 3 × Ø3.4 holes on a Ø66 circle.
- The pockets take the Ø13 flanges of the coil bobbin (slide).
- Wire 3-phase by series groups: on 9 coils 1-4-7, 2-5-8, 3-6-9; on 6 coils 1-4, 2-5, 3-6; rectify with a 3-phase bridge.
Sizes
| stator | plate_mm | coils | coil_circle_mm | centre_hole_mm | mount_holes |
|---|---|---|---|---|---|
| stator-90-9coil | Ø90 × 4 | 9 | 72 | 14 | 3 × Ø3.4 on Ø86 |
| stator-70-6coil | Ø70 × 4 | 6 | 52 | 14 | 3 × Ø3.4 on Ø66 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| centre hole | Ø14 | shaft passes clear (no contact) | designed | stator-* |
| coil pockets | Ø20 | bobbin flange Ø20 | slide | stator-* |
| mounting holes | Ø3.4 | M3 screw clearance | designed | stator-* |
| coil-to-rotor air gap | 1.5 each side (8 stator and bobbin, rotor faces 11 apart) | rotor magnet face | designed | stator-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Axial flux motor | web | CC BY-SA 4.0 (text) |
| Wikipedia | Alternator | web | CC BY-SA 4.0 (text) |
| Hugh Piggott | A Wind Turbine Recipe Book (axial-flux alternator design) | web, PDF | Author's site verify |
| Long Earth Society | Engine and rig builds | web, video | LES site |
Free files
★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| stator-90-9coil | stator plate Ø90 × 8: 9 Ø20 coil pockets on a 66 mm circle (3-phase, 12 pole / 9 slot), Ø14 centre hole (shaft passes clear), 3 × Ø3.4 (M3 clearance) mounting holes on an 82 mm circle (2.3 mm wall to the rim) | STEP · STL |
| stator-70-6coil | stator plate Ø70 × 8: 6 Ø20 coil pockets on a 46 mm circle (8 pole / 6 slot), Ø14 centre hole, 3 × Ø3.4 mounting holes on a 62 mm circle (2.3 mm wall to the rim) | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=axial-flux-stator
How it fits
Connects to
Coil bobbin Ø10 core × 8 mm, Ø13 flangesØ13 bobbin flanges in the Ø13 pockets (slide)
Socket head cap screws, M2–M8M3 through the Ø3.4 mounting holesAlso needed
Axial-flux rotor platesmagnets on the same Ø72 / Ø52 circleYou might also need
Questions
How do I wire a 9-coil stator for 3-phase?
Coils 1-4-7, 2-5-8 and 3-6-9 each in series as the three phases, then a 3-phase bridge rectifier.
Does the shaft touch the stator?
No; the centre hole is Ø14 around the Ø8 shaft, so the stator is fixed to the frame by its three M3 holes.