Question: development of a 3 phase BLDC motor controller.

Electric Motors and Controllers
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arnespiessens   1 mW

1 mW
Posts: 19
Joined: Oct 26 2016 2:04pm

Question: development of a 3 phase BLDC motor controller.

Post by arnespiessens » Nov 08 2016 5:26am

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

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charlesmcnall   1 mW

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Posts: 16
Joined: Jul 12 2016 1:05pm
Location: SLC, UT

Re: Question: development of a 3 phase BLDC motor controller

Post by charlesmcnall » Nov 10 2016 1:46pm

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!
Electric Ninja 250 http://evalbum.com/preview.php?vid=5243
Lemond Etape 1400W hub motor 48V 15ah - need to make EValbum
6hp Electric snowblower conversion http://evalbum.com/preview.php?vid=5250

atarijedi   100 W

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Posts: 239
Joined: Jul 18 2016 7:16am

Re: Question: development of a 3 phase BLDC motor controller

Post by atarijedi » Nov 10 2016 9:09pm

arnespiessens wrote: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.

arnespiessens   1 mW

1 mW
Posts: 19
Joined: Oct 26 2016 2:04pm

3 questions about the devlopment of my BLDC motor controller

Post by arnespiessens » Nov 25 2016 10:08am

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   1 mW

1 mW
Posts: 13
Joined: Nov 30 2016 4:07am

Re: Question: development of a 3 phase BLDC motor controller

Post by rogervize » Dec 02 2016 4:54am

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 ..

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