• That tiny signal activates something which "latches" a larger switch. The larger switch could be electromechanical or purely electronic, but basically the tiny switch generally cannot carry the heavy current required for the motor. As for the motor itself... well, it's magnets or electromagnets wrapped around a spindle, sometimes with fixed magnets or opposing electromagnets mounted inside the shell of the motor. The opposing and attracting magnetic fields produced by electricity flowing through the coils are what actually spins the shaft.
  • The MIT website should be able to answer that better than I can. I have a tendency to ramble.
  • Why not?

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