I have got a brushless motor and dont have a brushless speed controller for it.

The brushless motor needs a speed controller of upto 100Amps

The speed controller i have is for brushed motors, and takes upto 100Amps will this be ok to use with my brushless motor

No you need a brushless speed controller to run a brushless motor on

hes not wrong you know...something to do with the phasing and the fact the coils are static instead of rotating

correct me I'm wrong, but brushless motors are more like DC motors than a brushed motor. They work totally different.

Actually brushless motors are like AC motors which is why we need a speed controller. The speed controller of a brushed motor simply supplies variable DC voltage/current. You can run a brushed motor on a DC power supply just as easily as from an ESC. The brushless controllers have to supply alternating voltage/current in different phases through the coils to oppose the magnets that are on the armature.

shoot, sorry you can see it was quite late when I said that, I meant AC

AC...DC...it's all just a bunch of electrons bouncing around inside the wire.

Thank for the info
I am new to electrics and have a lot of questions

Here is another question

Just say you have a 540 motor and it needs a 30Amp speed controller, can you use a bigger speed controller like 100Amp

Oh yeah. It's funny you say that. I have a 13" mono (MHZ Gecko) that has a 380 12S Feigao brushless that has a max amp draw of 47A. I think, but I'm running it with a Barracuda80 (80A ESC). When I built the boat there weren't as many ESC options as we have now. I also wanted the $40 motor to go first instead of the $150 ESC if something catastrophic happened. So, the setup I have now is on the very safe side. The brushless motor/ESC combos are sometimes hard to get right if you are like me and are pretty new to brushless. Ask as many questions you need.

Just to say it a different way, its always better to get an esc that is over rated for your application than not when you can afford it. But if you can't then at least make sure the esc has the minimum CONTINUOUS amps required for that motor. and the higher short burst amp rating of that same esc will save you in the event that something happens, like some weeds getting caught in the prop.

This is true for brushed motors and brushless.

I am considering buying the speed controller bellow

http://cgi.ebay.co.uk/ws/eBayISAPI.d...3124&rd=1&rd=1

I do have smaller brushless motors for planes which require 30Amp and 60Amp speed controller so buying the controller above which is 100Amp i will be able to change in each boat.

I have just noticed that the speed controller bellow conects to the motor with 3 wires i only have 2 wires on mine

That is a brushless setup. All brushless motors and esc's have 3 leads. Brushed setups only have two and they will not work together.
Is it possible that there is a 2 wire brushless motor? I have never seen one but the one in the picture looks like it is.

I wish I knew more about brushless technology but, I don't think it is possible to have a 2 wire brushless motor unless it is an AC motor. I don't know if the motor would be able to start spinning.

nitro bry - Do you have that motor with only 2 leads or is it a picture of one you're thinking of getting?

The picture is the one i have which i brought a few weeks ago
I not sure on the size of it but he said it needed a 100Amp speed controller which i wouls say its is a powerfull one

It looks alot like the Barraccuda. I would like to see the other side to see how many fets his has.

nitro bry - What are the physical dimensions of the motor? length...diameter Do have any other pics of it?


About the ESC - it does look a lot like my Barracuda 80. Take more pics of it too!

I will take some more pictures of it tomorrow
What are the fets

There is such a thing as a 2 wire/2 phase brushless DC motor, but not for hobby use as we know it. The cooling fans in computers, and stereo direct drive turntable motors are two examples of brushless two-phase (two-wire) DC motors.

The brushless motor as we know it is really a three phase AC motor (but the DC in a motor's categorization derives from the source power type, ergo it is still called a DC motor). It runs off a 'sort-of' AC (DC being switched on and off between two of the three phases at a time, at a specific frequency) converted from pure DC within the ESC. It needs a wire to feed juice to each phase of the windings. If the motor pictured is indeed brushless, it either has a wire broken off, or has a gross manufacturing flaw. Either way, brushless and brushed components do not mix.

Rick

ElectRick - You're right...thanks for that. I should've known because I've replaced those things before.