Magnetic Levitation Tram?
I need your help with a project i am attempting, i am in the process of making a maglev tram and i have a couple questions i need help with?
1. I have a simple circuit for a linear motor that i understand to the most part but i need help with finding an electromagnet to use / make, it needs to run on batteries and obviously the main concern here is weight and stability so the smaller the better but still needs to be strong enough to propel the tram along the track so i suppose my real question is what ammount of winding, resistance and core material would be suitable for whatever voltage i could provide!
2. Next i suppose what way round should i place the magnets, should i place many electromagnets on the rail with sensorsand permanent magnets on the tram, or should i have a powered electromagnet on the tram and permanent magnets on the track?
3. Also what hall sensor should i use to detect the magnetic fields, unipolar switches or ratiometric sensors?
4. And finally control, how would i control the motion of the tram i.e. speed and direction?
Id like to thank you all in advance for any help you could provide and i hope my description is accurate enough!!
Photo of simple linear motor circuit (img.1)
When the hall sensor (switch) senses a pole of a magnet, it activates the transistor, in turn magnetising the relay and causing the current in the electromagnet (motor) to run one direction, then as the opposite pole is detected the relay de-magnetises and reverses the current thus reversing the pole on the electromagnet! This is designed so that with permanent magnets on the track in an alternating fashion of poles (nsnsns) the tram is either pushed or pulled along the track!