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starter box motors... in series or parallel?

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starter box motors... in series or parallel?

Old 10-23-2016, 08:05 AM
  #31  
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Originally Posted by the wrench View Post
ha, well, that was kinda the whole point of starting this thread, google-fu'd to no end, netted no definite spec's on the titan motors... very limited wiring schematics and in reality, nobody really gives any thought to a starter box... until it fails... than xyz is at fault instead of just wiring it up right

i wanted to buy project/robotics cheapo motors, but who knew theres a billion versions of a 550... i had the titans on hand for another project, they came from an application that uses two 8.4 batteries... but than i started questioning how they are wired for their use in a car, than wondering about my old wiring... which officially had the original motors in a parallel connection, did i cook the old motors or were they just tired?

starter box supply voltage is 12.8(lead acid) to 16.8(4s) so with no motor spec's and no real understanding what the difference would be with motor wiring (i understand battery connections.. like series doubles the voltage, parallel doubles the amp/capacity) i just slapped the new motors back in exactly as i had the old ones... works fine, but still wondering if its "correct"
You will have to keep wondering if its "correct" without motor ratings. All I can say is safe wiring for those motors is series. If they are under powered, try parallel. If they seem fine like they are, they very well may be, for now anyway. Use this advice with a grain of salt.
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Old 10-24-2016, 07:16 AM
  #32  
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Originally Posted by 3DRCRACER View Post
You will have to keep wondering if its "correct" without motor ratings. All I can say is safe wiring for those motors is series. If they are under powered, try parallel. If they seem fine like they are, they very well may be, for now anyway. Use this advice with a grain of salt.
can you explain, in a general sense, the difference between wiring twin motors in series vs parallel... if the motors are known to be correctly rated for 12v use, i seriously cant grasp that concept vs how batteries get redistributed when you switch up the orientation

like i said originally, i dont know if parallel is ok... the only thing i could find to denote the titan motors was rs-550pc-8021, i tried looking up that number, and i got conflicting info everywhere...

i figured the worst that will happen is the brushes wear way faster, no real "safety" concerns, its a starter box, and im not using a lipo... btw, nothing is getting hot, leads, motors, batteries... held it down pretty long to prime, than to start.. took the car off, and popped the top... so with the ultra scientific finger test, everything seems ok so far
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Old 10-25-2016, 05:44 AM
  #33  
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Originally Posted by the wrench View Post
can you explain, in a general sense, the difference between wiring twin motors in series vs parallel... if the motors are known to be correctly rated for 12v use, i seriously cant grasp that concept vs how batteries get redistributed when you switch up the orientation

like i said originally, i dont know if parallel is ok... the only thing i could find to denote the titan motors was rs-550pc-8021, i tried looking up that number, and i got conflicting info everywhere...

i figured the worst that will happen is the brushes wear way faster, no real "safety" concerns, its a starter box, and im not using a lipo... btw, nothing is getting hot, leads, motors, batteries... held it down pretty long to prime, than to start.. took the car off, and popped the top... so with the ultra scientific finger test, everything seems ok so far
In your 12v system,
12v rated motors should be wired in parallel. Reason being is each motor connection is wired directly to the + and - terminals of the battery and receiving the full 12v.
[IMG][/IMG]
If you check test points 1 and 8, you will get 12v.
If you check test points 2 and 7, you will get 12v.
If you check test points 3 and 6, you will get 12v.
If you check test points 4 and 5, you will get 12v.
So each motor will be seeing 12v. Current is divided between each leg.

In a series circuit,[IMG][/IMG]
the voltage is divided across each equal resistor equally.
If you check test points 1 and 4, you will get 12v.
If you check test points 1 and 2, you will get 4v.
If you check test points 2 and 3, you will get 4v.
If you check test points 3 and 4, you will get 4v.
Each motor sees 4v. Current is the same through the entire circuit.

In a 2 motor series circuit, 6v motors would be ideal.

Hopefully the images came across.
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Old 11-06-2016, 01:08 AM
  #34  
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Maybe I can put another spin on this haha.
In series the voltage is shared, in parallel the current is shared.
I have the Kyosho starter box wired up in series, each 7.2 volt motor gets about the right voltage with 4s and the load on the switch is halved so hard to damage the switch.
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Old 11-08-2016, 04:18 PM
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Originally Posted by smelly62 View Post
Maybe I can put another spin on this haha.
In series the voltage is shared, in parallel the current is shared.
I have the Kyosho starter box wired up in series, each 7.2 volt motor gets about the right voltage with 4s and the load on the switch is halved so hard to damage the switch.
I have a brand new Kyosho starter box (red) that just smoked a motor using a 4s, while I have a older (red) Kyosho starter box that is just fine running a 4s and I have a third Kyosho (black) starter box running 2 nimh batteries. My question that no one seems to answer is are these "7.2" volt motors really able to handle the 4s or is it saver to run a 3s or two 2s batteries wired in a series or not...
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Old 11-08-2016, 06:16 PM
  #36  
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if the motors are in series they should be ok. my ofna blue box motors are in series and they handle a 4s easily. i put a relay on mine to take the load off the switches.
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