Rahul
Dead Member
i have read the jac book and i dont think i have fully got it yet.
how would u explain it....
how would u explain it....
AC induction motors (1 Viewer)
- Thread starter Rahul
- Start date
Twintip
Member
Rahul is back!
Sorry. Er, I dunno. Haven't mastered it yet either.
Sorry. Er, I dunno. Haven't mastered it yet either.
There was another thread made ages ago that talked about induction motors with an in depth explanation, so you might want to have a look at it:
http://www.boredofstudies.org/community/showthread.php?threadid=1476
The basic principle of an induction motor is that a moving magnetic field around the circumference of a metal disc causes the disc to rotate, and this "moving" magnetic field is created by several electromagnets placed evenly around the disc, and each electromagnet is switched on SEQUENTIALLY. Each electromagnet coil is connected to an AC power source, and the AC power sources must have a certain phase difference relative to eachother so that each electromagnet is switched on sequentially. This simulates a magnetic field moving around the disc, hence the disc spins.
It's important to know that the advantage of AC induction motors over standard AC motors is that an induction motor has less moving parts and no brushes are needed so there's less friction, less heat, more efficiency, less wear & tear. Also AC induction motors are quite cheap to manufacture, making them one of the most common type of motor used today (in stuff like power appliances, drills, saws etc). The disadvantage of induction motors is that they are quite inflexible because their operating speed cannot be easily controlled or changed, since the speed is dependent on the frequency of the AC voltage supply and the number of electromagnet poles used.
http://www.boredofstudies.org/community/showthread.php?threadid=1476
The basic principle of an induction motor is that a moving magnetic field around the circumference of a metal disc causes the disc to rotate, and this "moving" magnetic field is created by several electromagnets placed evenly around the disc, and each electromagnet is switched on SEQUENTIALLY. Each electromagnet coil is connected to an AC power source, and the AC power sources must have a certain phase difference relative to eachother so that each electromagnet is switched on sequentially. This simulates a magnetic field moving around the disc, hence the disc spins.
It's important to know that the advantage of AC induction motors over standard AC motors is that an induction motor has less moving parts and no brushes are needed so there's less friction, less heat, more efficiency, less wear & tear. Also AC induction motors are quite cheap to manufacture, making them one of the most common type of motor used today (in stuff like power appliances, drills, saws etc). The disadvantage of induction motors is that they are quite inflexible because their operating speed cannot be easily controlled or changed, since the speed is dependent on the frequency of the AC voltage supply and the number of electromagnet poles used.
Rahul
Dead Member
that was a good explanation wogboy, thanks for that!
i have a better understanding of it now
i'm back and better than ever, ehm.....back to work!
i have a better understanding of it now
i'm back and better than ever, ehm.....back to work!
Rahul
Dead Member
jus a q, how does the AC current set up the moving magnetic field?
is it due to the phase?
is it due to the phase?
kini mini
Active Member
Think about how a a DC current sets up a magnetic field. That magnetic field is doesn't change because the direction of the current remains constant. But AC current keeps changing direction, so the magnetic field around the current-carrying wires keeps changing.Originally posted by Rahul
jus a q, how does the AC current set up the moving magnetic field?
is it due to the phase?