# What is the difference between electrical angle and mechanical angle in rotating electrical machines?

Mechanical degrees: The degree of mechanical or physical rotation one conductor within an alternator.

Electric degrees, the amount or cycle of emf that is induced
one conductor in an alternator

Think about a Two Pole Alternator, where the conductor is rotated around
the field that the emf generated in the conductor is the highest
When the conductor is located at the middle of the pole. Emf is in the middle
The amount of energy induced will be minimal in the case of conductors situated in the middle
of the of the. So when we look at the
diagram of the induced emf against the degree or position of
rotation. One entire rotation of the condutor within the
Field – One full cycle of emf can be generated during the
Conductor (Positive half-cycle at the south pole and negative
halfcycle at the north pole).

Similar to when we think of a four pole alternator to be a single
conductors when they complete one mechanical turn will
Cross the four poles by displaying the graph of induced emf
With two positive half cycles as well as two negative half cycles
This will give us that gives us two cycles total of EMF induced.

That’s why for one Mechanical turn (360 360 degrees) the force is induced.
Emf completes the cycle of two (360 + 2 equals 720 degrees ) in terms of
The sine wave)

Therefore, the relationship between mechanical and electrical degrees
is possible to write as

Elect. Degrees = (N0. of Poles + 2) * Mechanical. Degrees

Source: Elecrical Machinery by P.S.Bimbhra