With two new members joining the household, there was an urgent need to purify the air. Drawing inspiration from the sleek design of Xiaomi’s air purifiers, I developed a custom air purifier based on an existing brushless motor.

1. The motor uses a brushless design similar to that of Xiaomi—though with a different shaft diameter. Brushless motors from brands like Nidec are widely available on the market, each operating at different voltages. Be sure to select a power supply that matches the motor’s voltage requirements. My specific brushless motor operates at 12V; simply ensure the mounting hole diameter and shaft diameter are compatible. Ideally, the shaft length should be equal to or slightly shorter than the dimensions shown in the design file. A simple test model is included in the file to verify that the mounting holes align correctly. Use three M3×8 screws for assembly.

2. Since the motor’s built‑in control board was damaged, I had to wire the three motor phases (U, V, W) separately and connect them directly to the following control board.

3. You’ll need a spare toggle switch, a DC connector, and a filter cartridge compatible with Xiaomi’s air purifiers.

4. The maximum blade diameter is 8 inches.

Installation Notes:

1. Simple soldering with an electric soldering iron is required for wiring. Always prioritize safety when working with electrical components.

2. For the controller shown in Step 2, I first secured it to the printed bracket before aligning the mounting holes and using 502 adhesive to fix it permanently to the housing. If you’re using a different controller, feel free to share a basic schematic—I can help create a custom model for you (since we may use various controllers, 502 adhesive provides sufficient strength and ease of installation).

3. The four feet are securely attached using 502 adhesive for quick and convenient installation.

4. If you already have a similar motor model and prefer not to purchase a new one, just reach out—I can modify the design accordingly.

If you have any further questions, please don’t hesitate to contact me—I’m happy to address each concern individually. Thank you for your support!