AC motors are known as the workhorse of industry.
Let me take a stab at this. Think about a generator. Then think about the concept of mechanical energy being converted to electrical energy. So I'm learning about wind turbines right now so if u wanna take that as an example, torque is a type of mechanical energy. When the blades of a wind turbine turn they generate a torque. That torque can be converted to electrical energy through a type of generator(a special type of circuit). There's some kind of law that says when you have a time varying magnetic field it generates a current. So an induction generator ( the type of generator i'm using to explain this example) is like a system involving magnetic fields that generates electricity (current) off of that principle. The current generated from that system is created by moving parts (ie creates the time variance aspect of the 'time varying magnetic field' requirement) called rotor and stator. I won't get into any more of the details of that but i hope that kind of makes sense. torque=>movement within a magnetic system=>magnetic fields that are changing over time=>production of current, due to faraday's law So the end result is that you get current, and when you have current you can get voltages (when you run that current across a resistor or any other type of impedance for example). and then you can have lots of fun from there. Hope that made some sense, good luck.
First but most important reason is - the AC motors are maintenance free because there is only one winding called armature. another reason is that in AC motor rotating steady parts are not touching each other so there is not any wear tear.
Because AC power is the most comming power in the world. That is the main reason, the contest between AC and DC was over a long time ago and AC won. There are some DC applications but AC is King.
Most processes use a constant RPM motor to do the work required and do not require a variable RPM or speed. In the past Variable Frequency Drives for AC motors were expensive and bulky. Now they are getting much less expensive and smaller in nature. One wall instead of the whole room. In the past if you wanted to have a variable RPM you had a tendency to use a DC motor. And you vary the voltage to get speed regulation. With an AC motor you just change the pulleys, gear reducer, or whatever to get the required speed and keep it constant for the process. AC motors for all practical purposes are plugged into the wall after getting the right voltage. DC motors require an MG set to get the correct voltage to get the correct speed.
AC motors are commonly used in the industry because AC supply is readily available . AC motors are very rugged and easier to maintain. They don't need armatures and carbon brushes.
