Does ac motor control circuit have to be communicated?
You need a commutator The commutator is a dc permanent-magnet series motor that allows the motor to continuously rotate to the original component. Structure, commutator is several contact piece into circular, connect every tap on the rotor respectively, connecting two electrodes called brush contact with the outside, only contact two of them at the same time.
When coil by current, under the action of permanent magnets, turn through the attraction and repulsion, when it turn to balance and magnet, the original through the electric line is corresponding with electric contact patches on the commutator I leave, and brush connected to the group that accord with steam coil corresponding contact, so keep repeating, dc motor turns up
In addition, the alternating current is a sinusoidal current, not a sudden change in the plot. It's a little bit of a gradient. So the magnetic field is also gradient. Instead of magnet, and ac motor in an iron core, the iron core in the gradient magnetic field induction current, magnetic field and the current must be pushing it normal rotation, of course also change. In other words, what you're saying is that the frequency invariant means that the external gradient is constant, but the induced magnetic field is related to the speed of rotation. And those motors that can shift gears are changed by changing the number of electrodes. For example: the current one period of the external gradient field turns a week, and now the two cycles of the tween magnetic field turn around for a week, not half the time!
