State three difference between AC motor and DC motor .?
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.After all, simple motors work because the the direction of current reverses (alternates) every half cycle, rendering the armature to rotate. Now why does the current have to alternate to allow for rotation? The left hand motor rule will show you their relation. I'll elaborate on that later.
Of course, as mentioned earlier, DC motors will also rotate only when the current direction changes, although the supply is unidirectional. The commutator is the mechanical device that allows the current in a conductor to reverse its direction.
To understand intuitively, read on:
AC means the direction of current is reversing every half cycle, about 100 times a second if it is a 50 Hz supply. DC just means the current is maintaining the same direction. As a principle, the current direction must change, in order for the motor to actually rotate. Why? Because the direction of current and the direction of motion of conductor are related - Take left hand rule for motors
Of course, as mentioned earlier, DC motors will also rotate only when the current direction changes, although the supply is unidirectional. The commutator is the mechanical device that allows the current in a conductor to reverse its direction.
To understand intuitively, read on:
AC means the direction of current is reversing every half cycle, about 100 times a second if it is a 50 Hz supply. DC just means the current is maintaining the same direction. As a principle, the current direction must change, in order for the motor to actually rotate. Why? Because the direction of current and the direction of motion of conductor are related - Take left hand rule for motors
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