I am working on a project, I don't want to say what it is. I am lost on it though so I need some help.

I am trying to use PWM to run a 12v motor that draws up to 90 amps. I had my own idea on how to do it but have come to find out that a relay will not do the job.

So, are any of you in the electronics field that can lead me to a PWM that will handle 12v and up to 90 amps? I guess what I need is a transistor controller and I can't seem to find the right thing just searching the internet.

Also, the PWM that I need I will be controlling with the AEM.

Thanks for any help. If you have an answer you can shoot me a PM if you don't mind.

 

Give Maynard a buzz.

 

Check these guys out they will do any custom stuff

http://www.pwmpower.com/

Free T-Shirt for the hook-up. Just Kidding I hope you find what you need

 

I take it this is for some kind of electronic cooling
I would use a transister, BUT there do exist super heavy duty relay's up to 120A I believe. I remember selling some to a concert set up crew manager.
I cant whip it out in a snap. You can try to get in touch with Gary Shear at alphatronics formely called supertronix in tukwila WA. Tell him Robert the UW guy sent ya!!!

 

here check this out, its rated up to 200Amps.
http://www.alliedelec.com/Images/Pro...ol_5761082.pdf

 

or go to http://www.alliedelec.com/
and find one to your liking.

 

Thanks for the links. If I end up getting what I need from any of these links I'll gladly ship out a free t-shirt or two!

This has nothing to do with cooling...........that project is already finished

 

Yea Dave the link I posted the guy will custom make whatever you need might even have it made already. Running a 12v motor no sweat

 

OK guys, thank you all for your help and for those of you that PM'd me thank you too.

I looked at the links and to be honest I am lost. Not afraid to admit it when I am clueless and this is one of those times.

Here is more details without telling you exactly what I am doing.

I have a 12v motor that draws 90 amps. I want to be able to use an output on the AEM to send a signal to this motor to run fast at times and slow at other times. Through researching this I found the best way to do this is with PWM. I guess the PWM I am looking for is going to allow me to input either a 5v signal or a ground to it for the signal to vary the speed.

So, I have a 12v motor with a ground wire and a positive wire on it. If I hook them both up to 12v the motor runs wide open and 100% of the time.

I need something to go between this and the AEM, right?

Damn I hate not knowing how to do something.

Thanks for the continued help.

 

Yes Dave, that's pretty much what a PWM controller does.

The biggest problem your going to have is current draw. While the motor is at say 50% duty cycle, it will draw much more current than it will at 100% DC.

Also, when an electric motor starts up it can draw up to 3 times the normal current draw, so factor that into your overload protection. Maybe using a time delay circuit breaker. I woul also only use 4awg as a minimum for this.

If it is some type of selinoid, make sure it can handle a PWM.

 

Shouldnt be too complicated. Send the signals from the AEM. Tune the motor speeds using a PWM. Then out to your motor.

The signals from your AEM will inturn run the motor at the desired speed.

 

ygpm with links on what ya need.

 

Thanks again guys for all the help. I found an ad in a magazine last night from KB electronics and it looked like they made what I needed. bolvangar also sent me a link to them last night and even the part that I eventually was recommended from KB. I will have the PWM tomorrow.

The AEM in "stock" format cannot do what I need it to. I have to thank John Romero at AEM for the assistance today, he will have my EMS tomorrow to make some internal changes for me.

Now I just need my new alternator and I will be putting this all together

I hope it works out..............watch in the upcoming weeks for the results. Probably will not be something we are going to sell but it should be interesting non-the-less.

Thanks again for the help.

 

yo hes building a hybrid evo! Electric assist....

Nonetheless, I am intrigued. Keep us posted

 

electrically assisted turbo is my guess

12v@90A is too little wattage to drive the wheels an appreciable amount (without looking at efficiencies thats only 1.4 hp)

Its too small drive anything that will have a signifigant perfomance gain directly (like driving the wheels) which means probably a pump of some kind
the only pump on our cars are water and oil and i dont see replacing them as being a worthwhile endeavour( although he did just have a water pump issue wuth his car)

Could be a pump for a hydraulicl system to use solenoids to completely eliminate cam shafts but why make the pump assembl when you can just buy one, not to mention it would be a real pain in the *** to construct

Ford had a lighning concept truck that compressed air from the A/C system and sored it in a tank to inject into the intake later and give it a shot of up to 50hp for 30-45 sex wit a 2 min recharge time(http://www.supercars.net/cars/2256.html) but the motor for the pump wouldnt need an input from the AEM, it could use a simple pressure trancer to shut it off and it would need to run at variable speeds

So that leaves me thing elecitrically assisting the turbo. You can't have the electric motor running max blast because you may not want what boost pressure that will give you at low RPMs when the engine ins't ingesting that much air. Also producing high boost with low mass air flow could gotu you into the surge limit of the compressor (http://64.225.76.178/catalog/compmaps/fig1.html)