What's the difference between:1) AC motor2) DC motor3) Induction motor4) Permanent magnet motorAnd is there such a thing as a DC induction motor?
An AC motor uses alternating current to provide poles in the armiture of the motor, it is easy to make but hard to reverse unless the leads are run out side the motor such as 3 phase. A DC motor at least in the past has a wire wound armature and in some cases brushes which wear out and require added expense with regard to hard ware to hold the brushes in place. I once saw a wire wound motor that started on AC brushes and then the brushes were centrifically thrown out to run the motor on AC induction but those should be put in a museum. A permanent magnet motor is a motor which uses magnets as poles to turn the motor. A starter motor in your car is a good example of a DC permanent magnet motor. It is because you can develope more horse power with a DC than a AC. And you wouldnt want the girls laughing at your car with an extension cord tail. Which motor you use is determined by the strength needed and of course changing directions and such. Three phase motors reverse easily but the size is prohibitive on something like a hand held drill. Since a induction motor relys on the calapsing field to induce the poles unless the DC is controlled to creat a calapsing field the DC wont work. In this world with electronic controls such as freq drives it is getting easyer to find thease new inventions around. One thing I have noticed is the motors are being rated higher than they should, for example they can advertise a heavy duty 3/4 horse motor when really it is a 1/2 horse that has been modified in some way at the factory. It is legal but Im not sure it is ethical. I hope that helps, Im not an expert by any means.
there are many types AC generally refers to induction like squirrel cage motors they are synchronous or asynchronous, shaded pole... could also be universal = AC/DC DC are torque motors, stepper motors... either AC and DC can have permanent magnets, these are small motors and are more energy efficient. Guru
