increase the current flow through the rotor\n\ncause imbalance in the magnetic field\n\nplace more weight on one pole\n\nstrengthen the iron form of the motor
200571
This type of ac motor uses the shading coil (the shaded pole or poles) to change the phase shift of the magnetic flux or field.The rotor is usually a laminated cylinder.Whe the induced currents in the rotor are out-of-phase a torque is produced on the rotor.The electric meter on a house uses this type , and the rotor is the aluminum disc that rotates.It can be shown that when ther is a phase shift caused by the closed copper turn(s) that a torque is produced.
565005
When a magnet is passed through the centre of a coil of wire an electric current is produced in the wire. The energy comes from the movement of the magnet. Kinetic energy is converted into electrical energy and this is how electricity is generated in a generator. The reverse can also happen. Passing electricity through the electric coil in your cars starter motor will cause the magnet inside to move. Hence electrical energy is converted to kinetic energy and this energy turns the crankshaft of your car to get it started.
408811
let us understand it in a simple way:\n   Suppose you have a magnet as shown below:\n                                [ N ]\n                                [ S ]\n\nBy cutting the magnet centrally, if you  mean cutting it vertically, then we would obtain the following configuration after cutting the magnet:\n                              [N] [N]\n                              [S] [S]\nThat is to say we have resulted in two magnets with polarities as shown above.Now as we all know that like polarities(N-N, S-S) repel and unlike polarities(N-S,S-N) attract, the result follows that the two magnet in above configuration repel each other while they attract when one of them is rotated by 180.\n[When one of the magnet is  rotated (say the second one) the following configuration results:\n                            [N] [S]\n                            [S] [N]\nand hence the result.]
149842
as someone pointed out. it could be because of a very large angular rotation decreasing the air resistance.
41597
Well, the easiest way is to get some wire, wrap it around a iron/steel rod, and apply a current to the wire.\n\nTo get an electromagnet to have a lifting capacity that you specified, it will require a little more engineering work.  Trying to stay in the most basic terms, the power of your magnet will depend on how much current you put through the wire, how many turns you have around the iron rod, and something called the magnetic permeability of the iron rod.  Now there's some trade-offs with all of these factors.  More turns increases the magnet flux (strength), but requires more wire and increases the resistance.  More resistance means that you will need more current to counteract this problem.  Treating your electromagnet strictly as a resistor (which it is not), by following Ohm's law, you increase the current by increasing the voltage.   Too much current and you may end up melting your wire.   You want to keep the wire as small as possible so that you can get the turns as close as possible to your iron rod, but smaller wire has a higher resistance and lower current carrying capability.\n\nIt's a matter of balancing a lot of equations to get the best combination.  Your best bet is a little trial and error.
527324
All rotating electrical machines can be classed as either "motor" or "generator". The definition is based on the direction of electrical power flow. A motor requires electrical power to provide rotation (and hence useful torque); a generator is driven by an outside torque source to produce electrical power.\n\nFor a machine to work, there has to be a magnetic field created to transfer the mechanical power to/from the stationary portion to the rotating portion.\n\nFor the case of an induction generator, an outside force rotates the shaft of the electrical machine. (You can assume here that the rotor has been magnetized through the use of an external capacitance circuit to provide discrete magnetic poles.) The rotation of the magnetic field, through mechanical means, induces a current to flow in the stator winding. Since the winding is a resistive path, there will also be a potential developed.\n\nThe output (volts and amps) will both be sine waves, operating at a frequency dependent on the rotational speed of the rotor and the number of poles.
88386
If I we're to guess:\nYou have tiny ammounts of iron in your bloodstream, the magents might attract the iron and pull the blood with it, and hence improving circulation. Although I may be wrong, my Dad has a magnentic bracelet, and he said it helps him a LOT.
31044
If you could pulse the electricity in the wire, it may change the velocity of the wire.  Look up something called Magneto-hydrodynamics
120111
All the above. the taller wheels will need more power and torque to move.
458753
You would need to have the magnet moving, and the power it would take to make it move would be more than any advantage you get out of it. Laws of Thermodynamics.
406266
Since you're dealing with a variable energy source (wind), you're best bet is to build a DC generator...\n\nIs this a science progect?\n\nA DC Generator is the same machine as a DC motor...  So if you're building something for your home, then just use a DC motor and a simple belt an pulley to reduce the rotational resistance (or load) on the blades, so a slower wind can be used...\n\nFor a Science project...  \nBuid three loops of wire and seperate them 60° on the rotor of the wind mill.  Place a magnet on either side. north to south\nSet up "brushes" (chunks of graphite like pencil lead) on either side so that as the rotor spins with the wind, the same side is going to the same terminal + or - no matter which side of the coil it is.\n\nHave fun with it...
416220
OK, below is a list of websites that may give you ideas.  Try a couple of ideas and test them at home before taking them into class?\n\nUsing the clothespin as the main source of energy does not necessarily mean that the spring has to be the main driver of the machine?  It might be used more as a trigger release – thus allowing the clothespin to be the main release of the energy.\n\nGood Luck.
213014
An induction motor will not work as a generator because there is no way you can create the magnetic field. You need some sort of magnetic field to make a generator work.\n\nIn order to induce a voltage you need three things:\n1. A conductor capable of carrying current\n2. A magnetic field\n3. Relative motion between the two.\n\nA generator either 3 phase or single phase, will have a rotating field. Power to this field is supplied via brushes and slip rings. See if you can find an old alternator from a car to take apart. Alternators are really 3 phase AC generators. The DC for the car is created using a set of diodes that you will find inside of the alternator. The diodes are often encased in plastic.\n\nA drill motor or other motor that has a commutator (a group of coppers bars that run parallel to the shaft) can be modified to be a generator, however it will produce a DC output.\n\n(Added 5/3)\nYou are correct that a voltage will be induced, however it is being induced in a place where you can't get it. An induction motor uses a squirrel cage rotor. When connected properly, the rotating magnetic field of the stator induces a voltage in the rotor. This voltage creates a magnetic field that causes the motor to rotate. However, since there are no slip rings or other connection to the rotor, there is no way for you to draw off the power generated. \n\nTo make a long story short, an induction motor can not be used as a generator. It simply does not have what you need to work.
233345
try to prove Ohm's Law. it relatively simple. but of course you're playing with electricity so careful if u try it...or do something on sound(doppler effect), or even magnetism(there are some sick stuff you can do with these) if everything sounds boring try light..experiment with diferent colors and such, or try to make your own laser(hehe..but dont flash it in your eyes)\nwhatever you do good luck
399973
since with no motor it stopped the only possible answer is 100%\n\nthe motor had to accelerate the mass so FOR A TIME less than 100% but once the mass was in motion the only power requirement was that required to overcome drag ( friction )\n\nthe interesting part is that if you remove the cylinder and run the motor only the same answer still applies\n\nif you want a different answer then you can rephrase the question - what amount of 'power' did the motor impart to the flywheel or what amount of 'power' was used to accelerate the flywheel ( the power will always be 100% used so you need the kilowatts or horsepower or some other measurement for a useful answer )
337487
it can affect the oil filter.it increases its work.
288181
Here are a couple of web sites that approach this in different ways. \n\nhttp://www.circletrack.com/techarticles/84199/\n\nhttp://www.diracdelta.co.uk/science/source/e/n/engine%20excitation%20mechanisms/source.html\n\nHope these help.