# If load angle of 4 pole synchronous motor is 8° electrical its value in mechanical degree is

If load angle of 4 pole synchronous motor is 8° electrical its value in mechanical degree is

### Right Answer is:

4

#### SOLUTION

**Mechanical Degree:** Mechanical degree or angle is the angle at which the rotor of a machine is displaced mechanically.

**Electrical Degree:** The degree or the cycle of emf induced in a single conductor in a synchronous machine. In one electrical cycle, the electrical angle varies from 0-360 degree

- Consider a 4 pole machine there are 2 North and 2 South poles. So the rotor had to rotate 180 degrees mechanically to reach from one North pole to another North pole.
- That is to generate a complete cycle(360 degrees) electrically it has to rotate half cycle(180 degrees)mechanically.
- So the relation between electrical and mechanical angle is dependent on the no of poles in the machine.

**Electrical Degree = (No of poles/2) × Mechanical Degree**

8 = (4/2) × Mechanical Degree

**Mechanical Degree = 4°**