There are so many quantities which are responsible for the speed of motors, So let's start with few of them: We know Synchronous speed Ns =120f/P & S = (Ns-N)/Ns From where N = Ns - SNs i.e. N = Ns(1-S) & Hence Speed of rotor is N = (1-S)120f/P Where, N = speed of rotor f = frequency of supply voltage S = slip of motor & P = no. of poles on stator From this formula we can see that speed is depends upon frequency of supply voltage, slip of motor, poles on stator, etc. Other then these Speed also depends upon supply voltage & also on loads. .. .. .. While, In DC motors We know E = ZNP phi/60A Now N = 60AE/ZP phi Where N= speed & it depends upon the following quantities: A = no.of parallel ways Z = no.of conductors P = no. Of poles Phi = flux cutting the conductors etc. .. Please feel free to give suggestions if there is any error. .. Please support if you like this: SOCIAL HANDLES Website: curi...
Magnetism Electric fields and magnetic fields might seem different, but actually, they're part of one larger force called the electromagnetic force. Charges that aren't moving produce electric fields. But when those charges do the motion, they also create magnetic fields. Let us take an example while explaining this concept: when supply is given in the electrical machines, different types & kinds of magnetic fields are formed in different-different electrical machines (motors, generators, transformers, alternators, etc.). These magnetic fields are created by the flow of charges (electrons) when they are pushed by the supply voltage. So whenever there is a moving charge (or current flowing) there will also be a magnetic field. For example, a magnet is only a magnet because of moving charges inside it. And hence charges moving in a current carrying electric wire also produce magnetic fields. This is the main & basic concept behind the working of electrical machines.