Our X-combat, we use starter motor to drive the mobility. Why we choose starter motor? Simple, we have limited budget! starter motor is a powerful,fast yet low cost motor which is very suitable to used in building high speed robot such as, combat robot, blocker robot and etc. (Please visit here for the performance of starter motor.)
But the bad thing is, to use it, you need to slightly modify it. In the original condition, the whole body of the motor is grounded mean you can’t mount it to any conductor like steel. This is not good for robot builder. so, In this article, we will share with you in pictures how to disable the grounded body and replace it using high current wire.
Look at the terminal of the motor, there is a steel plate. Our job is to remove the steel plate to get a hole and two wires can go in through the hole.
At the back side of the gear box, there are four screws, take off the screws to separate the motor and the gear box.
At the back of gear box side, you can see a plastic carbon holder(black in color) screwed inside to hold the position of the two carbons. Do you notice that one of the screws is connecting to the wire of the carbon? That connection ground the whole body. Another carbon is connecting to the steel plate.
Take off the two screws which lock the carbon holder to the gear box.
Slowly, open the gear box.
You can see clearly how the steel plate mounted on the gear box with a rubber holder.
Use a test pen, remove the rubber holder.
Take out the carbon holder with the steel plate and bearing.
Remove the steel plate from the carbon holder.
Next, disconnect the carbon wire with the steel plate by cutting off the wire.
Repeat the same action to another carbon wire.
Drill the steel plate’s hole on the carbon’s holder to make it fit for two high current wires.
Place the carbon holder back to the gear box.
Insert two high current wires from the front of the gear box as shown in figure below.
Tighten the carbon holder back with screws.
Next will be some soldering work. Strip the two wires.
Apply some lead on the wires and slip in two shrinking tube to each wires.
Apply some lead on the carbon’s wire.
Connect the two carbons to wires and heating up the shrinking tube to cover the solder part. Be aware that do not cover the whole carbon’s wire with shrinking tube because you still need the flexibility of the carbon’s wire to allow the carbon to fit in the carbon holder later on.
Place the carbons and their springs back to their original holder. Use the bearing to block the carbons from coming out.
Place the motor armature back at the center.
Make sure the wires do not touch the motor armature to prevent any unwanted resistance.
At last, carefully close the motor cover. Be aware that the cover is magnetic. Make sure you do not let it pull out the motor armature and carbons otherwise you need to rearrange the whole thing again.
Tighten back the four screws and everything is done!
Finally, the modification is completed. you can now use it with no worries. Have a good try!
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