Q:i have two questions:-1) What is the main difference between an AC and DC motors in their construction?2) What makes an induction motor-turn?

1) DC motors have a commutator whilst AC motors do not. 2). The torque generated by current in the stator winding reacting with the magnetic field produced by current in the rotor. In the induction motor the rotor current is driven by voltage induced by the field produced by the stator winding currents - hence the name induction motor.

Q:A 16 pole synchronous motor runs at a speed of 450rev/min Determine:A) The supply frequencyB) The speed at which it would run if it operated at a frequency of 55Hz

both of the two people above are correct in their formula, one uses 120f/no. of poles, the other uses (60)f/pole pairs which are equal, besides poles are always pair in either motor or generator windings.

Q:what is the difference between ac servo sewing machine motor and dc servo sewing machine motor?

One requires alternating current to run, and the other requires direct current. Choose the one that fits with the power supply feeding the motor.

Q:I am using the motor on a toy car.

It takes less electronic parts to control a DC motor than an AC motor. Also DC motors have higher RPM's than AC motors. The rpm of a AC motor is depended on the frequency of the voltage and the number of poles. The rpm of a DC motor is depended on the current and voltage applied to it.

Q:I have a drill motor i was fooling around with and was wondering if i can use it as a generator? I thought maybe a wind generator. Its an AC motor and is magnetic. Were it has a lot of red wires and smooth steel were another piece can spin. Please let me know if i can and the best way to do it........Remember..................drill motor...AC motor...magnetic. Thanks in advance for your answers.

NO! and you can't make a wind turbine out of a ceiling fan either...

Q:I know over spinning most AC motors will turn them into AC generators. Is the same true of shaded pole motors?

Yes. It will generate power back into the AC supply. Some induction motors can be coaxed into generating into a load with a capacitor attached but without an AC supply connected. However, that is not a very reliable or versatile set-up.

Q:A sinlge phase AC motor is needed to lift up vertically a load of 150kg to 200kg using chain and gear. Please help.

Depends on how fast you want to lift it. With the right gears a tiny motor will do the job, although it may take hours.

Q:What is the purpose of the encoder and how can you tell if it is working properly. thanks

The purpose for an encoder is to know where the motor is by revolutions the motor makes. Example: If you are opening a garage door with an encoded motor the encoder can tell if the door is closed or half open by the revolutions the motor makes. Hope this helps

Q:I need to know for an economic calculation how much would it cost to uninstall a 15hp ac motor (old) and to install a new one that is attached to a industrial air compressor...please...just an estimate...

Should okorder /

Q:I am working on a variable frequency drive for an ac motor what parts do i need?

Not enough information! If you have a drive and a motor you have all the parts you need. Hook it up and program the thing.