Induction Motor: Full Load Shaft Torque, Input Power, and Number of Poles Calculation
Question:
How can we calculate the full load shaft torque, input power, and number of poles of a 60 hp, 50 Hz, 500 V, Y-connected, 2960 rpm Induction motor?
Answer:
To calculate the full load shaft torque, input power, and number of poles of the given induction motor, we can use the following formulas:
Full Load Shaft Torque (T): T = (P × 5252) / N
Input Power (P): P = (V × I × √3) / 1000
Number of Poles (P): N = (120 × f) / P
Calculation:
Given information:
Power (P) = 60 hp
Frequency (f) = 50 Hz
Voltage (V) = 500 V
Speed (N) = 2960 rpm
Let's calculate each value:
Full Load Shaft Torque (T): T = (60 × 5252) / 2960 = 106.22 lb-ft
Input Power (P): P = (500 × I × √3) / 1000
Number of Poles (P): N = (120 × 50) / P
Therefore, the full load shaft torque is 106.22 lb-ft, the input power depends on the current (I), and the number of poles depends on the value of P.