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Old 09-05-2005, 10:23 PM   #1
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Default Motor Problems

Hi All,
I have an almost new 19t Fantom motor. It has been run for 4 5 minutes races and maybe 10 minutes of practice. Anyway, during practice I thought my battery had died on me, the car gradually got slower and eventually can to a complete stop (but is had full steering I didn't notice at the time). It was a new battery, so I thought it just dumped on me. I went home and discharged the battery and found it was almost half full. I thought it was odd, but went ahead and charged it again. I went out to run my car with it and it didn't move. I had steering, but no "gas". It would kind of run if I pushed the car while the throttle was on. I seemed to have full power only when I was rolling the car backwards It would completely die when I let go. So I took the motor apart, it all looked OK and reassembled it. The motor worked excellent for about half the battery then it died. I have no idea what might be causing this. Both the battery and motor were not even hot to the touch. Any ideas? This has happened three striaght times. And it happens with different batteries.
Thanks
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Old 09-05-2005, 10:29 PM   #2
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sounds like you have a brush sticking, check your brush hoods are not too tight
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Old 09-05-2005, 10:38 PM   #3
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Quote:
Originally Posted by crimson eagle
sounds like you have a brush sticking, check your brush hoods are not too tight
I bet the shunts have wicked with solder making them solid
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Old 09-05-2005, 10:43 PM   #4
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Take the motor apart and take a ohm meter to the com and check to see if you don't have an open connection between two of the poles. I had a C2 that would run only if you gave it a push start. It had an open pole or connection on the armature.
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Old 09-07-2005, 07:14 AM   #5
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I am new to all of this, so maybe you guys can steer me in the right direction

crimson eagle, how can you adjust the "tightness" (if thats a word) of the brush hoods.

CarlosG., I'm not sure what you mean by "pole".

Thanks
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Old 09-07-2005, 09:59 AM   #6
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The three copper plates where the brushes make contact to the commutator. check to see if you have continuity between each copper plate. If you don't between them, then you will not have full power use of the motor.
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Old 09-07-2005, 11:21 AM   #7
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Losi,

The easiest way is to disassemble the end bell and take all of the metal hardware off then run a brush backwards and forwards in the slot to see how tight it is. when it's disassembled it should be easy to adjust. The only issue you will have is reassembling, you need to get the brush hoods aligned correctly. Failing this, tahe the end bell off and run the brush back and forth to see if it is binding. It does not have to bind much to hang the brush up. You may want to checkyour brush spring tension too, if it's too light this will not help if it is binding a little.
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