DC 12V-32V 50A Motor Speed Controller (PWM)

[habitbraker21]

ALL those simple PWM speed controllers work until you connect load to the motor. PWM controller doesnt know that and motor will simply stop!

So ir real world youll need some kind of feedback to know how fast is motor running.

[RICHARDakaCHUCK]

@habitbraker21 I won't agree. Steper motors does stop, but not DC motors... If shorter duty cycle is applied DC motor just has less power, slower rpm but it doesn't stop.

[habitbraker21]

@RICHARDakaCHUCK

thats what i was saying! It has less power, torque so if you load it a little, it simply cant maintain that slow speed - it stops. To maintain slow speed at load, you need a servo

[RICHARDakaCHUCK]

@habitbraker21 So then you need to make longer duty cycle until you have rpm that suits your needs under a certain load. I see no problem here...

[davemaster99]

Greetings, power stage details please

[motiondynamics2010]

@davemaster99 1.5v Led voltage reference to the base of the BDX37

[motiondynamics2010]

This controller design was ultimately scrapped. There were 2 problems with it, 1) the regulator had trouble with PSU's that were littered with peaks and sags. 2) The mosfets were driven directly from an op-amp. So they spent too much time in the linear region (between on and off states). Rather than fix the problems, it was easier just to learn from the mistakes from the past and design a new one.

[Lyeroth]

@motiondynamics2010 Hello, mate! I was thinking about to buy one of these motors. The specification that I have is "Bosch GPA 24v 750W motor". I believe that this one is the same of your. Can you tell me if this one is good? Well, I mean... It can be used on a Electric Bicycle project? And I liked your control too. It is eficient? I searched it by the "Motion Dynamic" name and I found the to buy it. But, if i purchase one 75amp model, it can control two 750w motors?

[29riteshkakkar]

Great......

[neomatrix7776]

hola , esta muy bien, quisiera saber cual es la corriente de consumo en vacio del motor y la corriente a plena carga. a que frecuencia trabaja ?

[motiondynamics2010]

the controller can be viewed online, just search for motion dynamics and speed control.

[TheError404]

Nice, it's easy to make a controller like yours, 555 timer and few mosfets

[motiondynamics2010]

@TheError404 Thats where I started. But then I had to make sure the gates always got greater than 10v if someone ran 12v and the battery level was low, or there were sags in the power. Then I had to deal with the back emf a large motor could put out, Then I wanted the capability to control with a hall effect or a pot, then I wanted soft start, then I wanted 48v capability without the use of a regulator chip. Yup, easy when you start, its when you add features that it gets more complex ;)

[WilliamTang]

i love your controller how much does that cost ?

[markoconroy]

do you have an ebay store>?

[motiondynamics2010]

@markoconroy I do, though I don't use it as much as I should.

[ashrafmuhammad38]

hello motiondynamics i want to make or purchase this controller please help