PCB stepper motor

PCB stepper motor has now officially been certified as open source hardware by the
Open Source Hardware Association.

It is time for new coil board

• better coil shape
• better coil connection

Hamburger structure with 3 wheels is very reliable, precise aligned and use all magnetic field from both sides. also speed and temperature at 2,5V is usable for long time operation

I have try add some speed .... at 2,5V boards have acceptable temperature

I received new coils ... I can just say older are better, but this new are good as simple stepper demonstrator,

12 steps per rotation, board is simple, working almost without heat :)

to reduce cost I am try maximize space on 4-layer board

Also I separating to 4layer coil board + bearing board with driving demonstrator

4 coils with about 80 turns (hand painted), only 3 magnets 10mm or 5mm

Also some coil variants, ordered in OSH park great 4 layer service.

Finaly I get second bearing ...now is motor assembled to final hamburger structure.

I add 2 wheels with magnets to outer side, significantly improve torque.

Check run video !!!

- header detail

-assembled motor

-Inside motor

-Unipoar tester

-Rim detail ... inner wheel is smaller

stepper motor support bipolar and unipolar mode, but there is no high current driver for unipolar mode

This is experimental redesign first board

but on 0.8mm 2oz board

2 layer board of 1.30 x 1.18 inches (33.0 x 29.9mm) 
3 boards will cost $7.65

Finishing design,

In my life it is first 4 layers design

spec.

10 turns per layer 2 coils in series

4 layer board of 1.35 x 1.26 inches (34.3 x 32.1mm) 
3 boards will cost $17.00