A Guide to Understanding Induction Motor Performance

What is the shaft torque of a 308-V, 30-hp, 8-pole, 50 Hz, A-connected induction motor with a full-load slip of 2%?

a. 15 hp
b. 20 hp
c. 25 hp
d. 30 hp

Answer:

The shaft torque of the motor can be calculated using the formula: shaft torque = (30 hp * 5252) / (750 RPM) = 209.67 lb-ft.

Induction motors play a crucial role in various industrial applications. Understanding the performance characteristics of an induction motor, such as shaft torque, synchronous speed, and rotor speed, is essential for optimizing its operation.

In the case of a 308-V, 30-hp, 8-pole, 50 Hz, A-connected induction motor with a full-load slip of 2%, the shaft torque can be calculated using the given power rating, synchronous speed, and slip percentage. By applying the appropriate formula, we can determine the shaft torque of the motor.

In this example, the calculated shaft torque is approximately 209.67 lb-ft, which indicates the motor's ability to generate torque at full load conditions. This information is crucial for understanding the motor's performance and ensuring it operates effectively within its rated specifications.

By gaining a deeper insight into the operation of induction motors and their performance characteristics, engineers and technicians can enhance the efficiency and reliability of industrial processes that rely on these essential components.