I've been looking to make the solenoid motor powerful enough to drive a toy vehicle.
I've improved the stator of the solenoid by reducing gaps and wrapping the coil in a cast iron dust/swarf and epoxy mix. I increased the size of the armature magnets and overall have a 5x increase in force. More details: Solenoid Tractor - glue-it.com
A section through one of my test pieces
Latest video of the motor running, just need to connect the crank to the wheels.
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