Posted by MarkB_MI on July 08, 2018 at 12:29:46 from (174.230.6.120):
In Reply to: Re: Electric DC Motors posted by vicinalvictor on July 08, 2018 at 09:06:47:
> I was looking at the two wires coming from the DC motor, and they I think they are 10 gauge wires.
It depends on how long your wires are relative to the wires supplied with the motor. If they're a lot longer, you should probably go up a size to 8 gauge. It never hurts to have heavier-than-necessary wires, assuming you can still route them and connect them to your switch.
> Do you think I need to run those wires through a diode or something?
Running a diode in series with the motor won't do anything but drop the voltage available to the motor by about 0.7 volts. And diodes that can handle 30 amps continuous are expensive.
That said, diodes are sometimes placed in parallel with motors to protect solid-state switches from damage. It's not normally done with mechanical switches, although it can reduce switch arcing. The diode is reverse-biased so that no current flows through it when power is applied to the motor, but when the switch opens the current in the motor has a low-resistance path to follow, so there's no inductive "kickback".
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