4 pole star connected alternator running at 1500 rpm have 72 slots with 10 conductors per slot.The number of turns per phase and slot angle?

Question

Answer

72 slots * 10 conductors per slot = 720 conductors now turns per phase = 720/(3*2)= 120 again coil span 72/4 = 18 slot angle = 180/18 = 10

Answer

Calculating Turns per Phase and Slot Angle for a 4 Pole Star Connected Alternator

Given:

Calculating Turns per Phase:

First, we need to calculate the total number of conductors in the stator. This can be done by multiplying the number of slots by the number of conductors per slot. So, total number of conductors = 72 x 10 = 720

Next, we need to calculate the number of conductors per phase. Since this is a 4 pole alternator, there will be 4 phases. So, the number of conductors per phase will be total number of conductors divided by 4. Therefore, number of conductors per phase = 720/4 = 180

Finally, we need to calculate the number of turns per phase. This can be done by dividing the number of conductors per phase by 2, as each conductor carries one-half of the total current. Therefore, number of turns per phase = 180/2 = 90 turns

Calculating Slot Angle:

The slot angle is the angular distance between two adjacent slots in the stator. This can be calculated using the formula: slot angle = 360°/number of slots. Therefore, slot angle = 360°/72 = 5°

Explanation:

Turns per phase is a crucial parameter in the design of an alternator. It determines the amount of voltage generated per phase and hence the overall power output of the alternator. In this case, the turns per phase is calculated to be 90 turns.

The slot angle is also an important parameter as it affects the distribution of magnetic flux in the stator. A smaller slot angle results in a more uniform distribution of flux, which in turn leads to better performance of the alternator. In this case, the slot angle is calculated to be 5°.