12volt motor speed controller

[andysctt1]

I have a 12v automotive starter I am using for a drive motor on a kart but have no way of controlling it yet. it pulls an initial load of 250amps and decreases to aprox 100amps after a couple seconds. i'm using a 70a/h SLA battery. what I need is a controller that doesn't have all the extras on it(braking,reverse.etc). something simple that will decrease amperage so my batteries will last longer and hopefully increase motor life. most controllers I have found so far are listed as 24-48volts very few are listed 12v. similar to golf karts. is it possible that I use a controller to drop amperage to 60-70 amps without damaging the motor? or does the controller control voltage?

 

[nbucska]

The simplest is to use N-channel MOSFET to pulse width modulate the input. ( if the voltage is on 50% of the time
it is equivalent with .50* 12V = 6V )


<nbucska@pcperipherals.com>

 

[AFab]

Take a look

http://www.processregister.com/Curtis Instruments Inc./Supplier/sid6541.htm

 

[Barry1961]

You should be able to find a simple square wave generator schematic at Radio Shack. If you have a local electronics store (not Radio Shack) where TV techs buy supplies you could probably get someone there to bread board one for you cheap.

Barry1961

 

[jbartos]

Suggestion: Visit

http://www.thomasregister.com

and type Controls: Electric Motor, DC under Product or Service, which will return 20 companies to approach to

 

[cbarn24050]

Hi, you wont get very far with this kind of motor, you need something like a golf cart motor.

 

[jbartos]

Suggestion: Visit

http://www.thomasregister.com

and type Motors: Golf Cart under Product or Service, which will return 2 companies to approach to