For machines with Class B insulation, how many layers of inter turn insulation is made use of and what is the distance between the layers?

For machines with Class B insulation, typically there is no explicit, universally specified number of layers of inter-turn insulation, nor a set distance between these layers. The design specifics, including the number of insulation layers and their spacing, depend on the manufacturer’s design and the application requirements. Class B insulation is defined by its thermal endurance rather than its physical configuration. It is designed to withstand continuous operation at temperatures up to 130°C.

In electrical machines, the inter-turn insulation is crucial to prevent short circuits between the winding turns. The actual design considerations, including the number of layers and the distance between them, would be based on achieving the required thermal performance, electrical withstand capability, mechanical strength, and manufacturing considerations relevant to the specific type of machine.

Designing the insulation system for electrical machines (like motors or transformers) involves ensuring that the insulation not only withstands the operating temperatures but also other stresses like electrical, mechanical, and environmental, which could degrade the insulation over time.

For precise specifications, including the number of layers and spacing for a specific machine with Class B insulation, consultation of the manufacturer’s documentation or a detailed technical design standard specific to the type of machine would be necessary.