DIY HP C7000 Fan Potentiometer Upgrade

After searching online for simple instructions, the actual modification of the HP C7000 duct fan is simply adding a 20K-100K potentiometer. It's not too difficult to get it running, but integrating it into the whole unit requires some hands-on manufacturing skills.

The modification principle is to simulate the original machine's control of the potentiometer to start and stop, change the potentiometer's speed, and high/low speed switching can also be achieved using a switch. The power output of the refined version is not as great as the rough version after modification, so the modification scheme has some flaws. The actual current of the rough version is 14A, which is basically full power output. The simple chart uses the rough version for wind power. I used a mobile lithium battery pack to make a dust blowing tool. The rough version is what I actually made and demonstrated. The refined version has a few more 20K resistors connected in series to the high point of the potentiometer, and everything else is the same.

Impressions of the rough version modification: the wind power is still strong and reliable. The actual airflow does not reach the parameter's claimed 1.2KG, but it's barely adequate for blowing dust.

The first picture shows the rough version on top and the refined version on the bottom, with different codes .

Rough version on top

Left rough version, front view:

Fixed with a 20K potentiometer at the end of the wire:

Tested for normal operation for 2 hours:

Paired with a 12V460W power supply and connected with XT60H aviation plug:

Reference picture:

Connect the two ends of the second capacitor:

Refined version wiring diagram:

Refined version motor:

Refined version back:

Refined version front:

Terminal wiring diagram: