rudimentary ac and motor winding question
rudimentary ac and motor winding question
(OP)
Sorry for the 'youshouldknowthis'aspect of this question, but quickly.......a coil of wire will generate a magnetic field when current passes through it. In the case of a stator winding, the current goes through the wire in one direction, creating a magnetic field perpendicular to it, causing the rotor to turn one direction. as the current then changes direction, you would expect the magnetic field to change with it. I know there is a time factor here, field collapsing time, etc.. so is such that as the the direction of the current changes, that it is changed back so quickly that the back emf sort of maintains the existing direction until the opposing direction has switched back to the initial direction?
More simply put, how does a current changing directions 120 times a second cause a magnetic field to remain in only one state? How does it choose which direction? Why would one direction overcome the other?
Does this make sense?
More simply put, how does a current changing directions 120 times a second cause a magnetic field to remain in only one state? How does it choose which direction? Why would one direction overcome the other?
Does this make sense?





RE: rudimentary ac and motor winding question
What is the question?
What type of motor?
=====================================
(2B)+(2B)' ?
RE: rudimentary ac and motor winding question
RE: rudimentary ac and motor winding question
Please note Eng-Tips is for engineers helping one another, it is not intended to replace your ability to research electric motors via Google/Wikipedia/etc. or to take a university class.
RE: rudimentary ac and motor winding question
For single-phase motors, there is an oscillating magnetic field that will pull the rotor around - once you get it moving in one direction or the other.
Wikipedia for more..
David Castor
www.cvoes.com
RE: rudimentary ac and motor winding question
The magnetci field doesn't stay in one state. The magnetic field obeys the laws of physics in a motor.
http://www.lmgtfy.com/?q=ac+motor+theory
Try the first link to start...
RE: rudimentary ac and motor winding question
Good on ya,
Goober Dave
RE: rudimentary ac and motor winding question
Rafiq Bulsara
http://www.srengineersct.com
RE: rudimentary ac and motor winding question
RE: rudimentary ac and motor winding question
Maybe I just got lucky picking better search words. "AC motor theory" was my first search attempt. I didn't keep trying search terms until I got a good search result.
RE: rudimentary ac and motor winding question