2007-01-30 03:36:48 · 3 answers · asked by vamy189 2 in Science & Mathematics ➔ Engineering
i need a simple explanation for my physics gcse class
2007-01-30 04:47:50 · update #1
Hi, the windings around the poles of the armature form eletro- magnets when powered up, these forces are attracted or repelled by the permenant magnet in which it revolves, as it rotates the power is switched to the next pole by the commutator and brushes ,this mantains a constant opposing force between the rotating armature and the fixed magnetic field. - Wind some varnished wire around a nail, apply a battery to the wire ends and put the nail near a magnet, go on, try it!
2007-01-30 08:38:06 · answer #1 · answered by Brian E 2 · 1⤊ 0⤋
3 phase motor or single phase motor? If its a single phase motor then there are actually 2 phases that are put out of phase by a capacitor in one of the phases. Each phase has to be 120 degrees out of phase with its neighbour in order to set up a rotating magnetic field.
A rotating magnetic Field is set up within the 2 or 3 phases. the motor rotor is usually a squirrel cage with fixed iron rods. The moving magnetic Field cuts across the cage rods inducing a torque in the same direction as the rotating magnetic Field within the squirrel cage. The Squirrel cage rotates at a speed slightly lower than speed of rotation of the magnetic Field The motor shaft runs through the centre of the squirrel cage. A 3 phase motor does not need a capacitor.
These are called induction motors. They do not require commutators or slip rings.
Hope this helps.
Look up Flemings left hand rule and Flemings right hand rule. for a simple explanation of motors and generators. Trust me its not a wind up.
2007-01-30 20:12:02 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I saw this on the TV show Beakman's World and I was very impressed that you could actually build a working electric motor with so few parts. I built one and brought it to work where it was a big hit with all the engineers around here. This writeup was for a friend of mine who wanted instructions that his son could follow for a science fair project. So, if you missed the show, here's how to build one. If you are using a text only browser, you can click on the "Figure" links to download the drawing s (GIF files).
You should include the Beakman's World show in your bibliography.
2007-01-30 12:37:00 · answer #3 · answered by landhermit 4 · 0⤊ 0⤋