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Custom Toroidal Transformers

Toroidal Transformers

Johnson Electric Coil Company is a leading producer of toroidal transformers and other products in the power transformer market. We have been in business for more than 80 years, and through continuous improvement, the development of our lean manufacturing toroid work cell has enabled us to compete on a global scale in toroid design, manufacture, and cost. We have designed our toroid work cell to optimize our technology and labor alike, thus minimizing handling and increasing throughput. In fact, our entire operation is based on lean manufacturing principles, which demand that every minute, movement, and material in our process is continually and critically evaluated for the value it adds, and anything identified as waste is eliminated wherever possible. Too, our careful attention to ergonomics, worker safety and well-being helps to prevent costly injuries and lost time, creating a happier, healthier employee group with minimal turnover. All of these efforts not only save us cost, but we pass those savings on to you, meaning our toroidal transformers are competitively priced.

A toroidal transformer is an electro-magnetic device that transfers or transforms energy from one electric circuit to another without changing its frequency. Toroidal transformers are known to maximize power with minimal size and weight. Thanks to the toroidal transformer’s ring or doughnut shape, the windings of a toroidal design pass through the core’s center, encircling the cross-sectional area of the core, and can be distributed evenly in relation to it, yielding a remarkably space efficient design. In the industrial power, 50/60Hz range, the toroidal transformer core is constructed from “tape-wound” nickel-iron alloy or silicon iron. For high frequency applications, powdered iron and various amorphous alloys are materials of choice. In addition, the unique configuration and the fact that toroidal construction significantly minimizes air gaps in its build results in the toroidal transformer’s concentrated magnetic field, allowing minimal energy loss as the magnetic flux is largely confined to the core. Toroidal design is also ideal for reducing electromagnetic interference, leakage inductance, and audible noise.

Another advantage, compact size and low weight means toroidal transformers can be included in just about any power source application, often where available space is not well-suited to a more conventional EI transformer design. Johnson toroidal transformers are currently found in a wide range of industries and applications including aerospace, security systems, industrial, welding, medical and dental suite equipment, and power protection devices and systems.

We would welcome the opportunity to work with you on your toroidal transformer requirements, whatever your application or market. By working with you, our customer, we can provide complete design, engineering, and manufacturing services that fit your specialty transformer needs and specifications. Weighing the advantages and trade-offs of each, we will happily help you determine which type of transformer best meets your needs, electrical, mechanical, and budgetary alike. Your complete satisfaction is important to us throughout all aspects of our business, from design and manufacturing to scheduling, packaging, invoicing, and shipping. We know that for us to remain leaders in our industry, we must provide products and services that enable you to remain a leader in your industry.

Johnson Electric Coil Company takes the responsibility of designing and manufacturing your toroidal transformers very seriously. In addition, our engineering team is one of the best in the business, with a combined 74 years of experience, so you can be assured that you are getting a product that will function seamlessly in your application. We ask the right questions. We research safety agency requirements and government regulations during the design phase in order to take you safely through the agency mine field and offer further support to assist you with your product safety approvals and compliance efforts as needed. Our goal is to provide you, our customer, with a worry free experience, which we achieve by providing high quality products and services in addition to watching your orders, providing updates, assisting you in any way, including finding the best freight carriers at the best price on a shipment by shipment basis.

We look forward to working with you the way you like to work—by phone, email, or fax, or even in person when possible. If you are looking for a toroidal transformer, please contact us today. We will work with you to either provide a custom design to meet your unique requirements or work from your design. From isolation transformers to autotransformers, pieced lamination construction to toroidal transformers, low voltage, high voltage, high frequency, whatever your ideas or needs, you can count on Johnson Electric Coil Company to provide a solution that works for you.

Johnson Electric Coil Company’s goal is to provide unified, unselfish, single minded customer service, every day, with every design, request for quote, and shipment, to each and every one of our customers. All of our transformers are made at our Antigo, Wisconsin location by caring, capable people who understand and are committed to that goal. Our values and commitment to our customers date back to our founding, and you can be sure that as a family owned business we remain committed to quality service and premium products, just as we expect from our vendors.

For further information on our toroidal transformers or any of our products and services, give us a call today!

“Unified - Unselfish - Single Minded
Outstanding Customer Service”