Q:basic difference between normal and servo motor?

The two answers are right to some degree but my answer to the question would be as follows. Electric motors fall into to categories (industrial and servo) because the two types of motor have different performance requirements. The industrial machine is not normally required to have high acceleration and deceleration and is required to perform continuously for long periods. The servo motor is the GTI of the motor world and needs to have high accel/decel capability, good duty cycle performance. Both types of motors can have devices attached to give them extra capabilities. It is normal for a servo motor to have some form of rotor position measuring device (resolver or encoder). Industrial machines can also have simliar devices because with the advances in drive technology , modern drives can control the position of industrial machines. When looking at AC or DC in either category, generally DC motors have brushes that require maintenance every 2 years or so. AC motors do not have brushes. AC motors have the windings on the stator of the machine and heat can excape easily from the motor. DC machines generally have the high current carrying windings on the rotor and heat is difficult to extract without blowing air thorough the motor. AC machines should be generally considered as 1st choice for a new project in this century.

Q:i want the difference in working operation at the rotor side as at synchronous motor rotor feeded by D.C current but at induction by A.C

In okorder

Q:I'm looking for the websites about the design and theory of ac/dc motor.Thanks!

Here okorder

Q:What is ac motor? and what is dc motor? how it differentiate?

Alternate okorder /

Q:i conducted experiment by taking two electric motors from rc toys and connected them by gears.1.5v is supplied to a motor and other motor also rotates due to gear arrangement.we also know that electricity is generated in second motor.i want to know electricity generated is ac or dc current.

The current generated is ac current.

Q:please help i am doing an assignment on electrictric motors and have no clue what this answer is.. the question isExplain where the force comes from that makes the elecrtic motor work!!!! somebody?

Yep, what Justin said.....

Q:pls give me suitable region with example

When electrons move in a conductor there is always lines of magnetic flux radiating out from the conductor. AC magnets change their polarity at the same freq. as the applied voltage/current. AC motors work by creating a rotating magnetic field in the stator (stationary part) that the rotor (moving part) tries to keep up with. The rotor magnets are usually created by the induction of current into the rotor windings, often aluminum cast into a laminated iron rotor.

Q:I took apart a couple of small motors and found that they all have the copper coils attach to the shaft and spin around stationary magnets, rather then the other way around.The reason I'm asking is because they also have those two copper prongs touching the shaft in order to transfer the electricity back and forth, which wouldn't be necessary if you had the magnets spin and the coils stationary.

Motors work by having the rotor poles constantly attracted toward the stator poles they are approaching, and repelled from the stator poles they are moving away from. This means either the rotor poles or the stator poles must have alternating magnetic polarity. In a motor designed to run on AC, you could have magnets in the rotor if the stator coils are driven by AC. However this would require that the rotor spin exactly at the AC rate. Instead, AC motors don't use permanent magnets at all, but use the magnetic induction effect, with no commutator necessary, to produce rotating polarity in the rotor that matches that of the alternations of the stator field. For DC, coils are needed in the stator so the rotation of the rotor can be used to switch its own polarity via the coil current reversal provided by the commutator. If you had PMs in the rotor of a DC motor, with only DC in the stator coil there'd be no rotation. I suppose you could design a DC motor with a PM rotor and a commutator that switches the stator polarity. I think you'd need slip rings plus a commutator. That should work and it could be an interesting project.

Q:What happens if I overdrive an AC motor while connected to the AC whether single phase or three(3) for the dif?

Both AC motors would not burn out by such action. But both coupling gears could damage during engagement. No overload occur in AC supply but motors could be ceased for a while.

Q:What about the capacitance of the AC motor?

In general, the starting capacitor of single-phase AC motor can not be chosen too large, the starting torque angle will deviate from the maximum value, and the secondary winding current consumption will increase. The motor is too long for the motor to run for a long time!