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PCB stepper motor
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luiHS:
 
Hi.

I want to try to make stepper motors printed on PCB. I think there are important differences with conventional PAP motors with coils made of cable

Fundamentally, I am interested in knowing how to control these motors made with PCBs, in order to obtain the greatest number of steps and with it the greatest possible precision.

In a conventional PAP motor, from what I have seen, between the stator and the rotor, there is something more complex than a magnet / coil coupling, to achieve a large number of steps. But in these PAP motors with PCB printed coils that is not possible, so we have the number of steps equal to the number of printed coils multiplied by two, to achieve intermediate steps by activating two adjacent coils at the same time.

What is not clear to me is how many transistors are needed to activate a sequence of steps. For example, with a stator of 8 coils, I suppose we would have 16 possible steps, which is not much, and if I extend it to 16 coils it would have 32 possible steps.

But how many transistors are needed to control the 16 coils printed on PCB and in which sequence they should be activated?

I have seen that with 8 coils, they are activated 2 in 2, one coil and the opposite at the same time, and in other cases I have seen that with 12 coils, they are activated 3 in 3, and always in a sequence of 4, with which always use 4 transistors.

With 16 printed coils, should I also use 4 transistors, how do I connect these coils and in what sequence do I activate them?

On the other hand, I suppose that the way to increase the power with these motors, is by making larger coils, with more turns and putting bigger magnets, is that so? My idea is to use round neodymium magnets of at least 10mm in diameter, and increase the coils to the same diameter, with a 4-layer PCB that has each coil printed on each layer, connected in serial to increase the total number of turns.

 
Regards

 
ali_asadzadeh:
Did you rotate that thing? :-+
martin1454:
Check this project:
https://hackaday.io/project/85502-pcb-stepper-motor
luiHS:

--- Quote from: martin1454 on November 13, 2019, 07:31:07 am ---Check this project:
https://hackaday.io/project/85502-pcb-stepper-motor

--- End quote ---

 
I already know that project, but it doesn't solve my doubts.

 
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