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Johnson Electric Coil Company is a complete manufacturer of auto transformers for many industries. Their large inventory of stock and custom manufactured transformers is made with the mission to offer only the highest quality of products and services. Johnson Electric Coil's motto is "great people making great transformers for great reasons." Let Johnson make a great transformer for you!
Whether you want to buy a standard "off-the-shelf" transformer or need custom transformers, Glen Magnetics is here to meet your exact requirements. Contact us for a quote today and discover why customers depend on us for both custom and standard parts. Send us your drawings or samples, or have our engineers create the best possible design for your application. Ask us about auto transformers.
For over 50 years, Triad Magnetics has been designing & manufacturing auto transformers for a wide range of industries. In Triad's standard product line, they have over 1,000 part numbers, which means you are most likely to find what you`re looking for. Whether you need switchmode, wall plug-in, inductors or audio transformers, Triad Magnetics either has it in stock or they can custom design.
We are among the largest US custom transformer manufacturers with products including inductors, high-power switching transformers, high-power 3-phase inverters/converters, toroidal transformers. We serve electronic, medical, military, industrial, standby power and telecommunication markets.
Lenco Electronics, Inc. specializes in a wide variety of custom auto transformers. Lenco's success has not come about by accident, but by providing its customers with high-quality products. When you do business with Lenco, you can do it with confidence that your product was designed and engineered by professionals. Your special application is our specialty, so call Lenco today!
ISO 9001:2000 registered Sun Transformer creates custom transformers optimized for the needs of many industries. Large power, isolation & auto transformers, printed circuit mount power transformers, units for hostile conditions, units with ferrite or nickel cores for digital telecommunications use, etc.
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Industry Information
View A Video on Auto Transformers - A Quick Introduction
Auto Transformers
Some typical applications of autotransformers include use as voltage regulators and speaker adapters as well as to simulate low line conditions for testing, interconnect systems and for impedance matching. While auto transformers have many advantages over two-winding transformers, 3 phase transformers are used in applications in which autotransformers are not appropriate. Such applications include controlling harmonic currents and providing a source of ground fault currents. Used in equipment such as motor starters, boosters and static balancers, auto transformers are often used in the automotive, commercial, power transmission, electronics, telecommunications and marine industries.
Auto transformers consist of a single winding and an input and output circuit. Common to both circuits, the winding has at minimum three electrical connection points that are referred to as taps. The voltage source and the load are both connected to two of the taps. One tap at the end of the winding serves as a common connection to the source and the load circuits. The lack of insulation between the input and output circuits is a disadvantage of auto transformers, because a failure of the winding could result in the full input voltage being applied to the output. There are many different types of auto transformers: zig zag transformers, step-up transformers, step-down transformers and variable autotransformers. Zig zag transformers are special-purpose transformers that are intended for use in providing earthing for ungrounded electrical systems. Step-down transformers convert higher voltages to lower voltages by having fewer secondary coil windings, while step-up transformers' higher number of secondary coil windings allow them to convert lower voltages to higher voltages. Variable autotransformers are only applicable for low voltage designs and are often referred to as variable AC transformers.
