Question: development of a 3 phase BLDC motor controller.

[masterEVO]

Hello,

I am developing a 3 phase BLDC motor controller for an e-step.
Basically there are five main parts: the power supply (36V in my case), the microcontroller, the mosfet drivers, the mosfets and the motor.

I am stuck because I wanna make a prototype controller on a breadboard but with all the wires it is impossible to test it.
I was wondering if there is anything on the market that integrates the mosfet drivers and mosfets in one single component.

It would simplify my breadboard alot.

My current is 7A continuous.


Thanks in advance,
Arne

 

[charlesmcnall]

There are a few options i can think of.
Easiest is get a hobby or ebike BLDC controller and rip off the IC and run jumpers to the mosfets on that.
then you only have a small number of wires and you can test your microcontroller easy.

TI has a bunch of power boards for insta spin you could tap into.
https://store.ti.com/boostxl-drv8301.aspx
http://www.ti.com/lit/ug/tidu708/tidu708.pdf

Good luck!

 

[atarijedi]

Hello,

I am developing a 3 phase BLDC motor controller for an e-step.
Basically there are five main parts: the power supply (36V in my case), the microcontroller, the mosfet drivers, the mosfets and the motor.

I am stuck because I wanna make a prototype controller on a breadboard but with all the wires it is impossible to test it.
I was wondering if there is anything on the market that integrates the mosfet drivers and mosfets in one single component.

It would simplify my breadboard alot.

My current is 7A continuous.


Thanks in advance,
Arne

I would typically go to a distributor website like Digikey, Mouser, Newark, and search through their offerings to see if such a thing exists. Then you can find the manufacturers that offer them, go to the website and find out more on that component.

 

[masterEVO]

Hi,

I have 3 questions about my BLDC motor controller (36V 250W) I am developing.

1) What is better: one 3 phase mosfet driver that powers all 6 mosfets (simplifies it a lot) or three 1 phase mosfet drivers that powers one half bridge at a time.

2) Is current sensing better with shunt resistors or with external hall effect current sensors?

3) In some controllers, there is an extra dc/dc converter used to power the single phase mosfet drivers. Why is that? Must all the drivers voltages kept segregated? Or must each driver have its own ground?

Thanks in advance

 

[rogervize]

The power mos-fet driver chips are working hard so best use an individual device for each hi-lo pair of fets.
You need to switch the fets off really fast and that is hard with the huge gate capacitance of each fet.
The separate high side pwr supply is to drive N-Channel fets on the high side since the gate must remain 5v above the source.
But you don't actually need a high side pwr supply because you can use the charge pump method.
Many h-drive chips allow for this ..