What is the relation between the output coefficient to the volume of active parts in a rotating electric machine?

The output coefficient in a rotating electric machine, such as an electric motor or generator, relates to the volume of active parts (like the rotor and stator) because it is a measure of how efficiently the machine converts electrical energy into mechanical energy (or vice versa) relative to its size. Essentially, the output coefficient is an indicator of the machine’s performance density.

The volume of active parts in a rotating electric machine includes the core and winding space within the stator and rotor where electromagnetic energy conversion takes place. These components are crucial in determining the machine’s overall efficiency and output power.

A higher output coefficient means a more efficient use of the volume of active parts, leading to a more compact and possibly more economical machine for a given output power. Conversely, a lower output coefficient may indicate less efficient use of material and space, potentially leading to a larger, less efficient machine.

The relation, therefore, is that improving the design and material properties of the active parts can significantly impact the output coefficient. For example, using high-grade magnetic materials can reduce losses and improve efficiency, allowing for a higher output coefficient. Similarly, optimizing the design to reduce wasted space or improve thermal management can also enhance the output coefficient, enabling a high power output relative to the machine size.