What happens when the diameter under armature is 150 mm or above?

When the diameter under armature (typically in the context of electrical machines such as motors and generators) is 150 mm or above, several implications and considerations come into play:

1. Heat Dissipation: Larger diameters can help in improving heat dissipation. As electrical machines operate, they generate heat. A larger physical size allows for a larger surface area, potentially improving the machine’s ability to dissipate heat to its surroundings. This can help in managing and reducing the overall temperature rise of the machine.

2. Torque Production: The torque of an electrical machine is proportional to its physical dimensions, including its diameter. A larger diameter under armature means that, for the same length, the machine can produce more torque. This is beneficial for applications requiring high torque.

3. Space Requirement and Weight: Increasing the diameter means the machine will require more space and will also be heavier. This might be a constraint in applications where space is limited or where the machine needs to be moved frequently or is part of a mobile application (like in electric vehicles).

4. Manufacturing Complexity and Cost: Larger diameters can lead to increased manufacturing complexity and higher costs. This includes costs related to materials, manufacturing processes, and also potentially transportation. Larger machines might require specialized equipment for assembly and testing, contributing to the overall cost.

5. Efficiency and Performance: With proper design, larger machines can be more efficient as they can have lower electric and magnetic losses proportionally. This is because