Axial-flux rotor plates: Ø90 with 12 magnets (Ø8 bore), Ø70 with 8 magnets (Ø5 bore) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/axial-flux-rotor/  (CC BY 4.0)
Basis: Coreless axial-flux layout: 12 poles on Ø90 or 8 poles on Ø70, pockets for Ø10 × 3 disc magnets, hub sized to the Ø8 / Ø5 shaft
Catalog version: 2026-10-20

Sizes: see table below
- The Ø90 rotor is a 5 mm plate with 12 pockets Ø10 × 3 deep on a Ø72 circle, a Ø32 × 8 hub underneath and a Ø8 bore through (13 mm overall).
- The Ø70 rotor has 8 pockets Ø10 × 3 on a Ø52 circle, a Ø26 × 8 hub and a Ø5 bore.
- A Ø2.5 radial hole (M3 tap drill) enters the hub 4 mm below the plate for a grub screw.
- Magnets alternate N-S around the ring; a second rotor facing it (N opposite S across the stator) doubles the flux.
- Frequency = rpm × poles / 120: 600 rpm on the 12-pole rotor is 60 Hz.

rotor  plate_mm  magnets  magnet_circle_mm  hub_mm  bore_mm
rotor-90-12x-10x3-b8  Ø90 × 5  12 × Ø10×3  72  Ø32 × 8  8
rotor-70-8x-10x3-b5  Ø70 × 5  8 × Ø10×3  52  Ø26 × 8  5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Axial flux motor — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Axial_flux_motor
- Wikipedia: Alternator — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Alternator
- Hugh Piggott: A Wind Turbine Recipe Book (axial-flux alternator design) — web, PDF — Author's site [verify license at link] — http://scoraigwind.co.uk/
- Long Earth Society: Engine and rig builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/axial-flux-rotor/index.json
API: https://xemstudio.com/api/geometry?object=axial-flux-rotor