At Bobinados Osés, we are a bespoke transformer manufacturer working with engineering departments that need a transformer designed around a specific specification, not a catalogue product.
If your project calls for a winding tailored to voltage, power and available space, our technical team can support you from the design phase through to the final verification of every unit.
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What is a custom EI transformer
A conventional transformer, also known as an EI-core transformer, uses a core of silicon steel laminations stacked in E and I shapes. The primary and secondary windings are wound on a bobbin, which is then inserted into the core.
As a bespoke transformer manufacturer, we adapt every element of this construction to your project, from the winding to the format of the finished unit. A custom EI transformer lets you fit the electrical behaviour to the equipment, instead of adapting the equipment to a standard part.
Why have your transformer made bespoke with Bobinados Osés
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ISO 9001 certification
Our certified quality management system guarantees traceability and control at every stage of the process, from design to the final electrical verification of each unit.
In-house winding, no subcontracting
We design and wind every unit at our own facilities. As specialists in the winding of a custom low frequency transformer, we can respond to specification changes without depending on third parties.
Engineering from the project phase
We work alongside your technical team to define the number of turns, enamelled wire gauge and insulation thermal class before production starts.
Technical specifications of our custom low frequency transformers
These are the characteristics we specialise in and where we reach the highest productivity. Even so, we welcome any customer proposal that falls outside these parameters:
- Bobbins: dimensions of up to 260 mm
- Wire diameter: between 0.01 mm and 2.5 mm
- Number of turns: not fixed, adjusted to each design
- Coil resistance and inductance: determined by the other design parameters, which lets us achieve the exact resistance and inductance your project needs
If your specification falls outside these ranges, contact our technical team. We study every proposal individually, and we don't rule out any project for being outside our usual working range.
As a bespoke transformer manufacturer, we build each custom low frequency transformer to the data you provide, with no minimum standard format.
Industrial applications of low frequency transformers
Our custom EI transformers are used in industrial machinery, automation, electrical panels and OEM equipment where a robust, reliable power supply is required.
They are especially well suited to manufacturers who integrate the transformer into a wider assembly and need a supplier involved from the design phase, not a generic catalogue supply. In these cases, being able to adjust the winding, the wire gauge and the electrical operating point makes the difference compared with a standard solution that doesn't fit the rest of the equipment.
Industries that trust Bobinados Osés
We work with manufacturers and integrators in sectors where electrical reliability and winding customisation are critical. These include lifting and elevators, renewable energy, medical technology and vending.
In lifting, the transformer is part of control panels where the available space is very limited. In renewable energy, it is integrated into control and monitoring systems, where long-term reliability is essential.
In all these sectors, the starting point is the same: a specific specification of voltage, power and format. It isn't about choosing a generic catalogue transformer, but about developing a solution adapted to the real needs of each application. That is what a bespoke transformer manufacturer is for.
Frequently asked questions about bespoke transformers
Can the size be adapted to the project?
Yes. Our usual bobbin range for a custom EI transformer goes up to 260 mm, but we assess any proposal outside that size according to the technical requirements of each project.
What does ISO 9001 certification guarantee in the manufacture of these transformers?
It guarantees a controlled, documented process at every stage, from design to final electrical verification, which gives your purchasing or engineering department traceability and consistency between units.
What information does Bobinados Osés need to prepare a quote?
Input and output voltage, required power or current, operating frequency and, where they exist, the space or weight limits of the equipment where the transformer will be integrated.
Do you need a custom low frequency transformer for your project?
If your equipment requires a transformer designed around a specific specification, we can study the winding, the core and the format that best suit your application, backed by our ISO 9001 quality system. Contact our technical team and we'll help you define the solution your project needs.
