Simple motor controller

[Rcblack79]

Hello all, is it possible in this simple 555 circuit to supply the motor with a higher voltage with espect to the 12v that the 555 requires. From all my reading i have not seen it done

 

[APL]

I don't think the 555 voltage has anything to do with the motor voltage, they are two different things.

The 555 is fed by the 12v, that gets dropped with the 1k resistor, down to a useable (5v?) voltage.
(pretty sure thats how it goes)

The motor voltage and current is controlled by the transistor shown, but it's type isn't shown, so we don't
know the transistors ratings. (Or what it is, FET, SCR, ETC?)

The 555 control's the transistor through the 330 ohm resistor, which is a very small voltage.

The motor is fed through the VM, (+) and the ground, (-) as an independent circuit.

The voltage and current of the motor depends on what that transistor will handle. If you know the part number
of that, you can look up it's spec's, and see what it's ratings are, and then you can substitute it with a different one
for the rating your looking for if you need to.

Just my humble opinion, I'm no expert, but I've fooled with this stuff a lot over the years.

 

[AviatorTrainman]

This should be fine to supply whatever voltage you like to the motor, so long as the voltage to the 555 does not exceed 16 volts, and the two supplies share a common ground. The 555 is in fact fed directly by the 12 volt supply in this schematic, and the 1k resistor serves as part of a voltage divider for pin 7. If your motor supply does not exceed 35 volts, you can use a 7812 linear regulator to power the IC, but depending on load on the IC that can create a significant amount of heat. Keep in mind that you will need a transistor that can both handle the current of the motor, and be activated by the 555, which tops out at 16 volts and sources/sinks (supplies or takes) a maximum of 225 mA in most applications.

 

[Rcblack79]

Thank u every1. I will be attending school soon for electronics and computer engineering. Reading the curriculum it will close the gap on what i dont know on motor controller design, programming, networking, solid state devices and many others related to the subject. I do have a A.S in Elec technoloy, So please forgive for my entry level questions. The controllers im building are brushless dc with foc control. 75v 10a 555 fan cuircuit will help keep them cool. Most componets have been calculated and bought. My search for gate drivers, fets, csa and power supply was DIFFICULT. I only selected items that where made for slbldc motor control and with calculations that i can solve. My. goal is to build a larger version of a BL power tool esc with external cooling. 75vdc 120a cont. Once again thanks every1 for support.

 

[amberwolf]

There are a lot of schematics out there for doing this with a 555.

Most of the stuff in the searches aren't relevant, but some are.

https://www.google.com/search?newwindow=1&q=555+motor+controller&tbm=isch&source=univ&sa=X&ved=2ahUKEwjamsaxwcngAhUkwMQHHfaEBkcQsAR6BAgAEAE&biw=1844&bih=986

https://www.google.com/search?q=555+motor+controller&newwindow=1&source=lnms&tbm=vid&sa=X&ved=0ahUKEwjamsaxwcngAhUkwMQHHfaEBkcQ_AUIECgD&biw=1844&bih=986

https://www.google.com/search?q=555+motor+controller&ie=utf-8&oe=utf-8


You can also just look at any regular brushed motor controller schematic and see how their power stages are designed, and transfer those design ideas to your powerstage, leaving your control stage separate.

https://www.google.com/search?q=brushed+motor+controller+schematic&newwindow=1&source=lnms&sa=X&ved=0ahUKEwizw_icwsngAhUEHnwKHYr1D5AQ_AUICSgA&biw=1844&bih=986&dpr=1