Moonstar India · May 2023

Transformer Manufacturing
& Product Testing

Hands-on experience across the complete transformer manufacturing process — core assembly, coil winding, insulation, final assembly, electrical testing, quality inspection and technical documentation.

Manufacturing Process Experience

Industrial training across the full production workflow rather than a single workstation.

The placement covered the complete transformer manufacturing workflow rather than a single workstation, giving practical exposure to production processes, in-process quality control and the flow of material through the line.

Work covered core lamination cutting and stacking; primary and secondary coil winding; tap and lead preparation; insulation and varnish impregnation; TIG weld inspection; mechanical assembly; routine electrical testing; final quality inspection; and technical documentation.

The moulded components of the assembly — the bobbin and the end caps — are bought in rather than made on site. Visits to the supplier factories producing them covered the injection moulding process itself, extending the view of the product beyond the assembly line to the processes that determine the parts arriving at it.

Interactive 3D Transformer Assembly

Interactive 3D model — EI-core transformer assembly, 54 components.

GLB · 0.5 MB · loads on demand

KEEP SCROLLING

The transformer assembly open in SolidWorks, feature tree listing bobbin, E and I laminations, clamp and caps

Key Engineering Takeaways

Manufacturing-aware design. Understanding of how design decisions influence fabrication, assembly and serviceability.
Quality assurance. Systematic inspection techniques for identifying manufacturing defects before final testing.
Assembly planning. Practical knowledge of efficient assembly sequences and production workflow.
Technical documentation. Performance reports and inspection records supporting product quality verification.
Process awareness beyond assembly. Exposure to injection moulding at supplier factories, covering how the moulded components of the assembly are produced.

Injection moulding machine on the supplier factory floor, with hopper, clamping unit and control panel

The steel injection mould tool for a moulded component, showing the two halves and lifting eye

Technical Competencies Developed

Capabilities developed through industrial training across the production line.

Manufacturing process knowledge. First-hand understanding of transformer production end to end — core lamination stacking, coil winding, insulation and varnish impregnation, assembly, and how each stage constrains the next.
Quality inspection. Visual and dimensional inspection of components in process, and TIG weld assessment — reading a joint rather than assuming it is sound.
Electrical testing. Routine transformer tests including turns ratio, insulation resistance, and no-load and load checks, with results recorded against specification.
Technical documentation. Writing performance reports and inspection records that other people act on, and seeing how ambiguity in a drawing becomes a decision made on the shop floor.
Design for manufacture. Observing where design choices make assembly easy or awkward, which is the kind of judgement that only comes from having done the assembly.
Injection moulding awareness. Supplier factory visits covering the moulding of the bobbin and end caps — machine, tooling and the process that determines the parts arriving on the line.

Project Summary

Employer

Moonstar India — electrical transformer manufacturing unit, Kottarakkara, Kollam, Kerala

Role

Product Tester

Period

8 – 25 May 2023

Manufacturing Operations

Core lamination cutting and stacking · coil and bobbin winding · insulation, varnishing and impregnation · TIG weld inspection · final assembly and fitting · routine electrical testing · painting and finishing · packing, dispatch and documentation

Supplier Processes Observed

Injection moulding of the bobbin and end caps, at the supplier factories producing them

Primary Responsibilities

Overseeing transformer assembly and winding, checking TIG welding quality, generating performance reports

Verification