How to Rewind a Slot Car Motor

Written by clifton watson
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How to Rewind a Slot Car Motor
Periodic maintenance like an armature rewind keeps slot cars running for several years. (Thinkstock Images/Comstock/Getty Images)

Rewinding a slot car motor or armature is a delicate and difficult process. It requires steady hands and access to some specialised equipment like a soldering iron and magnetic wire. Performing this action can breathe new life into your slot car, so it is a highly favourable activity for slot car enthusiasts. It may take several tries to get it just right, so don't be too discouraged if your first few attempts don't yield the results you are looking for.

Skill level:
Moderately Challenging

Things you need

  • Soldering iron
  • Solder
  • Magnet/motor wire
  • Scissors

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  1. 1

    Unwind the existing wire from around the commutator tabs on your slot car's armature. These tabs are the arms extending outward from one end of the armature. There should be three or five of them evenly spaced. Do it gently so as not to damage any part of the motor. Notice the exact way that the wire has been wound around the armature, as this is what you will eventually replicate. You may need a small knife blade to slice through the wire so it can be removed.

  2. 2

    Take the wire you have removed from your slot car to a local hobby store so that you can ensure you are getting the same size for your rewind. The wire comes in various sizes, so make sure that you find the most compatible wire to use.

  3. 3

    Cut a new length of wire that is an inch or two longer than the wire you removed. You can always trim it later if it is a little too long.

  4. 4

    Place one end of the wire flat against a point halfway between two of the commutator tabs on your armature. Make sure it is placed so that the rest of the wire can be wound around the rest of the armature. Apply a small bit of solder to the end of the wire and, using the soldering iron, heat it to melt the solder and affix the wire's end to the armature.

  5. 5

    Wrap the wire carefully around the armature in the same way as the original wire. Solder the wire in place halfway between every commutator tab.

  6. 6

    Trim the end of the wire after winding so that the wire lies flat on the armature with both ends touching. Solder the end to the armature to finish your rewinding.

Tips and warnings

  • Take pictures from several angles or draw a diagram of the initial winding of your slot car before you begin. This gives you a reference point when you are rewinding your armature.

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