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Linear alternator back-iron sleeve Ø60.5 × Ø52.5 × 30
What size is the back iron of the linear alternator? · Hardware · basis: Tube at the sizes in the generator: OD 60.5, bore 52.5 (the bobbin flange OD), length 30 (the bobbin length)
Long Earth Society build part. Power take-off on the LES free-piston test bed. 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
- 3 in table
Notes
- The outer flux return of the alternator: a tube Ø60.5 × Ø52.5 bore × 30 long.
- The bobbin slides into its bore (Ø52.5, fit: slide) and it sits in the housing's Ø60.5 pocket (fit: socket) on a 2 mm ledge, held down by the cap ring.
- The magnetic gap from magnet face to the sleeve is 8.8 mm.
Sizes
| parameter | value |
|---|---|
| outside | 60.5 |
| bore | 52.5 |
| length | 30 |
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 |
|---|---|---|---|---|
| sleeve in the housing | Ø60.5 | housing pocket | socket | alt-back-iron-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| NASA (NTRS, public domain) | Linear alternator design for free-piston Stirling convertors (2005) | US Government work, public domain | |
| NASA (NTRS, public domain) | Sunpower/NASA 80 We free-piston Stirling convertor (2002) | US Government work, public domain | |
| Wikipedia | Linear alternator | web | CC BY-SA 4.0 (text) |
| Wikipedia | Free-piston engine | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| alt-back-iron-sleeve | back-iron sleeve Ø60.5 × Ø52.5 × 30: closes the magnet flux outside the coils; the bobbin slides in, the sleeve sits in the housing | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=linear-alternator-back-iron-sleeve
How it fits
Goes in or on
Linear alternator housing for Ø80 and Ø100 flexuresin the Ø60.5 pocketConnects to
Linear alternator bobbinbobbin in the Ø52.5 bore
Linear alternator cap ring, Ø96 and Ø116held down by the cap ringAlternatives
Schedule 40 pipe and PVC fittings, 1/2 to 2 inchNPS 2 Sch 40 pipe has a 52.5 boreIn these build lists
Free-piston Stirling, 2 in tri-clampNo crank: piston and displacer each hang on a stack of spiral flexures, with a t…Questions
What does the back-iron sleeve do?
It closes the magnets' flux outside the coils so the flux crosses the windings.
What size is the back-iron sleeve?
Ø60.5 outside, Ø52.5 bore, 30 long.