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What does this motor circuit do?

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spiffitz

New Member
This is on the back of a 380-size DC motor, run by six D cells through a momentary switch. You can see the motor terminals soldered on each side near the bottom. The red and orange wires on top are the power input leads.
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I hooked up 14.4v (12-cell NiMh pack) to get more speed out of it and it works fine, however it starts up slowly for the first half second. Is that what this board does?
 

Willbe

New Member
what this board does?

It's a high frequency transformer, or it's a filter to keep motor noise [RFI]out of other appliances and electronic devices.
 

audioguru

Well-Known Member
Most Helpful Member
Your motor starts slowly because your 14.4V battery or the battery connector cannot supply the very high starting current. The weak battery probably will cause the motor to slow down too much when it has a load.
 

spiffitz

New Member
Thanks, I guess I can leave it in then if it isn't limiting motor performance. I just need to assemble a new battery pack because the current ones are sort of mixed in cell capacity.

What is the green thing labeled "W200"?
 

Hero999

Banned
I don't know.

It looks like a current sensing resistor but it could be a fuse.
 
Last edited:

Nigel Goodwin

Super Moderator
Most Helpful Member
Thanks, I guess I can leave it in then if it isn't limiting motor performance. I just need to assemble a new battery pack because the current ones are sort of mixed in cell capacity.

Don't EVER mix batteries like that, or even ones of different makes - one will always go flat first, the others will reverse charge it, and it will split leaking chemicals everywhere.
 

spiffitz

New Member
Don't EVER mix batteries like that, or even ones of different makes - one will always go flat first, the others will reverse charge it, and it will split leaking chemicals everywhere.
Yeah I know, they were old batteries and I needed a high amp 14.4v source just to test the motor. The pack is an 8-cell and half of another 8-cell wired in series. I'm only on the first charge and I don't plan on recharging the pack after this. If I split the leads I can charge them separately but I plan on making a new pack from two identical 6-cell packs anyway. The local electronics toy store has 6-cell packs on clearance for 10 bucks but they only had one in stock.
 
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