What should be the minimum value of the ratio of the magnetic to electric loading?

The minimum value of the ratio of magnetic loading to electric loading in electrical machines is not a fixed value; rather, it depends on the design and operational requirements of the specific machine. Electric machines, such as transformers, motors, and generators, are designed based on a balance of electric and magnetic loadings to optimize their efficiency, cost, size, and performance.

However, the question seems to be seeking a specific value, which suggests a misconception. Magnetic loading refers to the average flux density (usually in Teslas) in the core, and electric loading refers to the current per unit length around the periphery of the armature (in Ampere-turns per meter). The ratio between these is influenced by the machine’s application, its operating conditions, and the desired electrical and mechanical parameters.

In contrast, some design considerations might lead to typical ranges or practices. For instance, a designer might aim for a higher magnetic loading for compactness but must balance it with losses and saturation concerns. Similarly, electric loading might be optimized for efficiency and heating considerations.

Therefore, the optimal or minimum value for this ratio is highly context-dependent, and there isn’t a universally applicable “minimum value” that can be accurately provided without detailed information about the specific machine, its operating conditions, and performance requirements. To determine this ratio for a particular design, complex calculations involving the machine’s geometry, magnetic and electric material properties, cooling methods, and performance targets must be carried out.

Given the above explanation, a universal numeric answer