How are normally AC motors reversed?
it depends on whether it is a three phase or single phase motor you are talking about. in 3 phase all that is needed is to swap 2 of the power legs to induce a reverse rotation. EX. (phase a , phase b , phase c) to reverse==> (phase a , phase c , phase b) or any other combination {only swap 2, if you swap all 3 you defeat the change in the magnetic fields and it spins the same. on a single phase motor, it has to have the ability to have access to it's winding wires (most small horsepower motors don't have this function) ac motors are designed for ac power, not to have there power signal changed to dc. if you change the power to dc, then you need a dc motor...
The phonograph the enduring, clever electric easy bulb quite, 22 inventors previous to Swan and Edison are credited with inventing an electric gentle bulb of a few form in spite of the undeniable fact that Edison's became as quickly as the 1st clever one. Edison holds a million,093 US patents in his call making him between the mandatory if no longer the main prolific inventor in history.
Look at the name-- ALTERNATING current. It means that it flows in both directions. If you have an AC motor you could hook positive or negative to either side and it would work. It will spin one direction depending on how the coils are wound Direct current on the other hand has a positive and negative side. If you hook up positive and negative to a certain side it will spin what we'll call the normal direction. If you reversed the positive and negative the motor would spin opposite of the normal direction. AC can be turned into DC by the use of a diode, or something called a bridge rectifier. Put simply, it limits the flow of the current so that it turns the alternating current which is going both ways, into direct current (DC) which only goes one way.
I know you probably want a definitive answer, but this sums it up nicely! www.physclips.unsw.edu.au/jw/elec...
