Why can't motors be made out of magnets?
2007-05-30 13:34:41 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
As stated before there are permanent magnet motors usually in DC servo applications.
The idea of magnet rotation is the bases for most motors, especially three phase. The coils are energized on and off to rotate the rotor and/or armature.
2007-05-30 16:06:16 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Knashha pretty much summed this one up. It would be necessary to either block the magnetic field or turn it on and off at specific points in the shafts rotation - neither of these possibilities are presently available with permanent magnetic fields. This is only possible with electro magnetic fields where the current creating the field can be controlled precisely.
Despite these obstacles - the idea of a permanent magnet motor is intriguing, none the less.
2007-05-30 22:50:50 · answer #2 · answered by LeAnne 7 · 0⤊ 0⤋
Permanent magnets in the stator will cause the shaft to settle in at rotary locations where the net force on the shaft is zero.
Then it will take energy to rotate it out. Which the magnets will not supply since they are responsible for putting the shaft in that position. If you spin it manually it will bump along and soon stop.
2007-05-30 21:10:02 · answer #3 · answered by knashha 5 · 0⤊ 0⤋
A whole lot of motors are made out of magnets...........
2007-05-30 20:58:54 · answer #4 · answered by Anonymous · 0⤊ 0⤋