How to stop high dc currents...
How to stop high dc currents...
(OP)
Hi to all:
Here is the deal: I'm building an electric kart using a Lynch DC motor rated at 48V, and I can't use an electronic controller for the speed because I'm building it for a one time race (2 miles, flat terrain) with very limited budget.
What i really want is to directly connect the 4 12V batteries (100A/Hr, very cheap lead/acid batteries) in series with the motor and start the race. But i need to reduce speed in some points of the track, and i can't figure out how to stop the 150A DC current the motor will consume... spending less than 20 or 30 USD :)
I was thinking in some relays in parallel, or using simply a high current switch to stop the current, but the switch capable to handle this kind of current is very expensive around here... So, i'm open to any advice or suggestion.
Thanks a lot (in advance :) ). Please don't call me crazy or stupid... I have a REALLY limited budget... :)
Pd: Can i use AC switches rated at the same current?
Here is the deal: I'm building an electric kart using a Lynch DC motor rated at 48V, and I can't use an electronic controller for the speed because I'm building it for a one time race (2 miles, flat terrain) with very limited budget.
What i really want is to directly connect the 4 12V batteries (100A/Hr, very cheap lead/acid batteries) in series with the motor and start the race. But i need to reduce speed in some points of the track, and i can't figure out how to stop the 150A DC current the motor will consume... spending less than 20 or 30 USD :)
I was thinking in some relays in parallel, or using simply a high current switch to stop the current, but the switch capable to handle this kind of current is very expensive around here... So, i'm open to any advice or suggestion.
Thanks a lot (in advance :) ). Please don't call me crazy or stupid... I have a REALLY limited budget... :)
Pd: Can i use AC switches rated at the same current?





RE: How to stop high dc currents...
RE: How to stop high dc currents...
RE: How to stop high dc currents...
RE: How to stop high dc currents...
I hope this helps you...
Best Regards
dydt (toronto)
RE: How to stop high dc currents...
Do you need variable control of the motor current? Would it work for you if you were to interupt the motor current and coast in the places where you need to slow down? If the latter would work then I would recommend a simple knife switch. You could operate the switch manually and use it to connect or disconnect the motor as needed. These switches and readily available and inexpensive. You could even make your own if you wanted to. There would be some arcing at the contacts each time you open and close the switch considering the 150 amp line current. Since the race is only two miles long, the life expectancy of the switch may not be an issue. If you wanted to reduce the amount of arcing and extend the switch life you could experiment with capacitors across the switch contacts.