paulsutton Posted March 2 Share Posted March 2 I am trying to build a small motor driven vehicle, this is toy size. I have a polycarbonate sheet and 4 motors, and 4 plastic wheels (but also have other wheel, so can interchange them. I have wired this up so far so that 2 of the wheels are wired up to a battery, the other 2 wheels are just attached to motors, my main issue regardless of how I do things, is that a motor plus wheel spins if held up, as soon as I put down on a flat surface, the motor + wheel stops turning. I am not an engineer, so not really sure what to do here. Thanks Paul Link to comment Share on other sites More sharing options...
swansont Posted March 2 Share Posted March 2 5 minutes ago, paulsutton said: I have wired this up so far so that 2 of the wheels are wired up to a battery, the other 2 wheels are just attached to motors, my main issue regardless of how I do things, is that a motor plus wheel spins if held up, as soon as I put down on a flat surface, the motor + wheel stops turning. Motors don’t always spin freely. The unconnected motors may be offering too much resistance for the car to move. Does the car roll very far if you just push it (no batteries)? 1 Link to comment Share on other sites More sharing options...
Externet Posted March 2 Share Posted March 2 The battery is too weak for the motors demand. The motors are too weak for the motion demand. The motors are too demanding for the battery capability. The connecting wiring is not soldered presenting resistance to electricity flow. The gearing does not match the needed torque. The motors that are not energized are presenting braking effect to the others. One or more of the above. Check if the car rolls smooth by hand when not energized. Try energizing only one wheeled motor instead and come back with observations. 1 Link to comment Share on other sites More sharing options...
paulsutton Posted March 3 Author Share Posted March 3 Hi Thanks for these suggestions, I will do as suggested. Paul Link to comment Share on other sites More sharing options...
paulsutton Posted March 5 Author Share Posted March 5 There is definitely a power issue. Using 2x cheap batteries and 2x Duracell makes a huge difference. I have wired up 2 motors, so that a battery pack can power 2 motors, then just need to do the same the other side. Paul Link to comment Share on other sites More sharing options...
paulsutton Posted March 17 Author Share Posted March 17 Update, I managed to get this working nicely using 2x AA batteries powering 2 motors at the front and the same for the other 2 motors at the back, bigger wheels also help. I am now looking to rebuild, motors will be glued on, with hot glue, rather than with sticky pads, gives a chance to do a quick re-design to make the wiring better. Thanks for the help / advice on this, really helpful. Paul Link to comment Share on other sites More sharing options...
pzkpfw Posted March 17 Share Posted March 17 Can you use pipeclamps and bolts? Glue is pretty one-way. (Though drilling polycarbonate sheet for bolt holes can be tricky.) Link to comment Share on other sites More sharing options...
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