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2204 brushless outrunner: Ø27.9 × 29.2 mm, 16 × 19 M3 mount
What are the dimensions of a 2204 brushless motor? · Hardware · basis: RCDrone listing of the EMAX MT2204 II drawing values. Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn.
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
- 6 in table
Notes
- Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn.
- 2204 names the stator: 22 mm diameter, 4 mm tall. The outside below is one maker's 2204; bell size, shaft and mount differ between makers.
- The bell is Ø27.9 and the motor is 29.2 mm tall overall, of which 12.5 is the Ø5 shaft above the bell; the top 7.5 of it is the M5 prop thread (drawn plain at Ø5). The base below the bell is drawn at the bell Ø as an envelope.
- Base mount: four M3 holes in a cross, two 16 mm apart and two 19 mm apart. The listing gives no thread depth, so they are drawn Ø3.0 × 3.0 deep only to mark them.
- The leads and the Ø8 centre boss on the drawing are not drawn (its height is not given).
- In DIY Stirling builds, brushless outrunners are driven by the engine as three-phase generators; the AC from the three leads is rectified for a load.
Sizes
| feature | mm | from |
|---|---|---|
| bell | Ø27.9 | RCDrone / EMAX MT2204 II |
| overall height | 29.2 | RCDrone / EMAX MT2204 II |
| bell and base height | 16.7 (29.2 − 12.5) | RCDrone / EMAX MT2204 II |
| shaft above the bell | Ø5 × 12.5, M5 thread 7.5 | RCDrone / EMAX MT2204 II |
| base holes | 4 × M3, cross 16 × 19 | RCDrone / EMAX MT2204 II |
| stator | 22 × 4 (the name) | size name |
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 |
|---|---|---|---|---|
| shaft | Ø5 (M5 thread on the top 7.5) | pulley, coupler or prop-adapter bore | slide | outrunner-2204* |
| base holes | 4 × M3, cross 16 × 19 (drawn 3.0 deep as position marks) | M3 screws through the mount | designed | outrunner-2204* |
| bell | Ø27.9, turns with the shaft | clearance in the mount (no contact) | designed | outrunner-2204* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| RCDrone (EMAX MT2204 II drawing values) | 2204 outrunner: Ø27.9, 29.2 overall, M5 shaft 12.5 out (7.5 threaded), 4 × M3 on 16 and 19 | web | listing verify |
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
| outrunner-2204 | 2204 outrunner envelope: Ø27.9 × 16.7 bell and base, Ø5 (M5) shaft 12.5 out of the top, 4 × M3 on 16 × 19 cross (3.0 deep position marks) | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=brushless-outrunner-2204
How it fits
Connects to
Socket head cap screws, M2–M8four M3 into the base, 16 × 19 cross
GT2 timing pulleys, 16T–60TØ5 bore on the Ø5 shaft (slide)
Flexible shaft couplers, 5–10 mm bores5 mm bore on the Ø5 shaft (slide)Alternatives
Axial-flux rotor platesa home-made axial-flux generator instead
NEMA 17 stepper motora stepper run as a two-phase generatorYou might also need
Questions
What are 2204 motor dimensions?
One common 2204 (EMAX MT2204 II) is Ø27.9 × 29.2 mm overall with a Ø5 / M5 shaft 12.5 mm out of the top and four M3 base holes on a 16 × 19 cross.
What is the 2204 motor mount pattern?
16 × 19 mm with M3 screws on this motor (two holes 16 apart, two 19 apart). Other makers use 16 × 16 or 12 × 12: check the motor in hand.
Can a brushless outrunner be used as a generator?
Yes: turned by an engine it puts out three-phase AC on its three leads; a three-phase bridge rectifier turns it into DC.