Looking for a controler
Hy guys I am new here found the site while doing a search. I am looking for a high voltage brushless sensorless controler. Need to be able to handle 120 volts at the least and more would be better. It also needs to be rated for at least 200 amps.
Thanks in advance for the help
Mike
I just bought a Kelly controller which is brushless and rated at 150 amps. I am pretty sure they now make one that will go 120 volts. Pretty good people to work with if there is a problem. I got an e-mail response within two hours- twice! Reasonably priced compared to other controllers.Good luck!
Hi Mike,
what type of motor are you planning on running?
i think the only motor type that can be run open loop is induction.
what are you planning on putting this motor/controller combination on?
you could try danfoss or any other industrial motor controller. They all do open loop control.
they also all take 600v or more.
Matt
Matt I am working with a alternator. I have it up and running on rc grade esc's "speed controler's"
It is going on this
These photo's where taken during construction. It has been finished with rear fender, lights, everything else and registered and inspected. I have put around 1000 miles on it with the brigs.
I have pulled the 16hp brigs v-twin off. My testing with the alternator is showing very promising but I need a high volt speed control.
Mike
ah, this could be easier than i thought.
are there brushes for the armature?
if yes you can treat this as a DC motor and use just about any DC controller.
i need to know a couple of things.
measure the resistance of the armature and field windings.
what was the alternator rated to originally (volts and amps).
you will probably find that you have to wire this motor as either a shunt or a sepex.
most alternators are designed so that a small amount of current is pushed through the armature, and a large amount of current is drawn from the field coils via a rectifier bridge.
Matt
sorry it took me so long to come back to this.
it took be a while to get my head around why you would need a brushless controller for a brushed motor.
have you had a look at the voltage wave form on an osciliscope?
if not, and you dont have one, do you have any analogue voltmeters floating around?
if you do, use it to measure the voltage on the motor side for the brushless motor controller.
im pretty sure you dont need a brushless controller as one of the controllers in a sepex (which im pretty sure how you wired it) setup.
the brushes and the commutator should change the polarity on the armature at the right times to run as a motor.
it just so happens that if you dont hook up hall sensors to some brushless controllers, they behave just like a brushed motor controller.
Matt
it took be a while to get my head around why you would need a brushless controller for a brushed motor.
Because they're not brushes for an armature, they're slip rings/brushes. They don't commutate at all, they just keep the field on the rotor excited (they're just on, not on/off/on like in a rotating DC motor). It does this in place of a perm magnet. The coils in outside of the motor can be rewired to run as BLDC motor. They're wired for 3 phase AC to keep the ripple current so the rectified output is smooth. Its also part of their namesake "ALTERNAT-or" as in Alternating current/AC.
ALL automotive alternators are like this. We have 2 running in one go-kart and it f***in flies. We've also got a minibike. 60V 150A
http://www.alternatorparts.com/understanding_alternators.htm
http://en.wikipedia.org/wiki/Alternator#Automotive_alternators
To the OP. I think 120V for an alternator is a bit too high. 200A MIGHT be a little high, but it can be detuned. What is the alternator rated for? how big is it? It might have trouble dissipating the heat. Why do you NEED these specs?
Also, there's not many controllers out there. We've got one we've developed at Synkromotive that will work, I can check to see its availability. Kelly may have one, but I think theirs run under 72V. There just aren't any manufacturers that have readily available BLDC motors running the specs you require, so no one else makes them. I can try to see if we plan on building anymore.
Ours runs without sensors... it can be a little jerky to start (tries to find the poles), but it goes and goes no problem. If you don't have hall sensors, you need a controller that does position sensing through Back-EMF.
we have a couple controllers, 1 BLDC, 1 AC Induction and 1 DC Series wound...
just keep in touch, what I'm kind of hinting at is, that we may be able to get you something that'd work. Where do you live?
Oh, did you email me? or David Boyd?
thanks for the relpy. I have looked at them but was unsure if they where sensorless. I guess I will sut them a email. I would really like to find one that is rated for a bit more voltage but I just dont think it is out there.
Mike