In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as
A. 1.0.
B. 1.5 to 2.
C. 2 to 3.
D. 3 to 5.
Show Answer
Answer: B
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In the case of induction motors, the ratio of length to pole pitch for minimum cost is typically taken as 1.5 to 2.
The length of the motor refers to the axial length of the core, which is the distance between the ends of the core laminations. The pole pitch is the distance between two consecutive poles along the circumference of the stator.
The choice of the length to pole pitch ratio is an important design consideration in terms of cost optimization. A ratio of 1.5 to 2 is commonly used because it provides a good balance between the size and cost of the motor. This ratio allows for efficient magnetic flux distribution and proper mechanical support of the windings, while keeping the overall dimensions and material requirements within reasonable limits.
Therefore, option B, 1.5 to 2, is the correct answer.