Q5Electrical Machine Design
Question
Q.5. What are the various factors considered in designing of electrical machines?
Answer
Factors in electrical machine design include electromagnetic loadings, thermal/cooling limits, mechanical strength, insulation class, economic material cost, and compliance with relevant standards.
The various factors considered in designing electrical machines include: specific magnetic loading (flux density) and specific electric loading (ampere-conductors per unit periphery), which together with speed determine the machine's principal dimensions via the output equation; the permissible temperature rise, dictated by the insulation class used and the cooling method available, which limits how much electric loading can be applied; mechanical strength requirements, including the ability to withstand centrifugal stress at rated speed and short-circuit forces on windings; efficiency and power factor requirements specified for the application; cost of active materials (copper, iron, insulation), since minimizing material cost while meeting performance is a central economic objective; and compliance with relevant national/international standards governing performance, safety, and testing.