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Hall sensor mount for TO-92S (A3144 / SS49E)
How do I mount a hall sensor to measure RPM? · Hardware · basis: Block sized to the A3144 UA / SS49E TO-92S body (4.09 × 1.52 mm), M3 foot hole at ISO 273 clearance (Ø3.4)
Long Earth Society build part. Hot-end thermocouple, cold-side DS18B20 and the flywheel RPM pickup on every LES engine. 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
- 4 in table
Notes
- The mount is a 14 × 10 × 20 mm block with a 4.09 × 1.52 × 10 mm deep slot in the top face for a TO-92S (UA) hall sensor body, exact.
- The slot sits 1.24 mm behind one 14 mm face, so the sensor's face is that close to the passing magnet side.
- A Ø3.4 hole (M3 clearance) runs through the 10 mm thickness, 5 mm above the base, for the screw that holds it.
- One magnet passing gives one pulse: rpm = pulses per second × 60 / magnets per revolution; on the 12-pole axial-flux rotor that is pulses × 60 / 12.
Sizes
| feature | size_mm |
|---|---|
| block | 14 × 10 × 20 |
| sensor slot | 4.09 × 1.52 × 10 deep |
| slot to face | 1.24 |
| foot hole | Ø3.4 (M3) |
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 |
|---|---|---|---|---|
| sensor slot | 4.09 × 1.52 | A3144 UA / SS49E TO-92S body | press | hall-sensor-mount-* |
| foot hole | Ø3.4 | M3 screw clearance | designed | hall-sensor-mount-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Thermocouple | web | CC BY-SA 4.0 (text) |
| Wikipedia | Hall effect sensor | web | CC BY-SA 4.0 (text) |
| Wikipedia | Dial indicator | web | CC BY-SA 4.0 (text) |
| Analog Devices | DS18B20 datasheet | Manufacturer datasheet | |
| Long Earth Society | Engine and rig 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
| hall-sensor-mount-to92 | hall sensor mount (A3144 UA / SS49E TO-92S): 4.09 × 1.52 body slot, Ø3.4 (M3 clearance) foot hole | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=hall-sensor-mount
How it fits
Goes in or on
Axial-flux rotor platesfaces a rotor magnet: 12 pulses per revolutionConnects to
Neodymium disc magnets, common sizessensor face 1–2 mm from a passing magnetAlternatives
Optical encoder disc Ø60, 30 slots, Ø5 boreoptical pickup through an IR slot sensorYou might also need
Questions
What size is a TO-92S hall sensor body?
4.09 × 1.52 mm (A3144 UA package, SS49E); the slot is drawn at exactly that.
How do I measure Stirling engine RPM with a hall sensor?
Put the sensor 1–2 mm from a magnet on the flywheel or rotor; rpm = pulses per second × 60 / magnets per revolution.