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Johnson Electric Coil Company - Single Phase and Three Phase Autotransformers
Johnson Electric Coil Company supplies a variety of single and three-phase autotransformers tailored for diverse industrial applications. Our products are engineered for high efficiency and durability, addressing both off-the-shelf needs and custom specifications. These autotransformers provide a cost-effective alternative to traditional two-winding transformers by using a single winding to perform dual roles in energy transfer, enhancing affordability and efficiency. Their compact design allows them to fit into a wide array of equipment, serving purposes such as voltage output control for large AC motors, power distribution line compensation, and household use. With a commitment to meeting rigorous safety standards and international specifications, our team adeptly handles complex projects, offering specialized services including prototype development and testing. From initial design to production, Johnson Electric Coil Company ensures the delivery of transformers that align with customer requirements and schedules, maintaining operational excellence at competitive costs.Autotransformers have a single coil winding design. They are used to interconnect systems with single windings that perform as both the primary and secondary sides. In a two-winding transformer, there are two separate windings that are connected by a magnetic field, which provides an electrical isolation of the windings.
An autotransformer has a single winding wrapped around a laminated core, which is used for the primary and secondary circuits. They have three terminals, one of the terminals is common to both input and the load. AC energy is supplied to the common and one of the other fixed terminals with the load connected to the common and the other fixed terminal.
Aside from the AC connection between the windings, energy flows through induction because of the variations of the windings. The variation generates magnetic flux which, in turn, induces an EMF or self-induction. The two fixed points of the winding act as the primary while the winding between the tap point and one fixed point acts as the secondary.
We supply single and three phase autotransformers to a number of different industries, delivering the high-quality, durable components they need, for a wide range of applications. Our engineers are adept at working to different specifications. In addition to the “off the-shelf” selection of single and three phase autotransformer options other companies offer, we can customize transformers to meet your specific requirements. Our team is experienced at working on specialist projects, providing innovative, cost-effective transformers that exactly meet your needs.
Being a specialty autotransformer manufacturer, we can move your design requirements forward by creating a prototype, testing that it works, and assuring production of electrical single or three phase autotransformers that are exactly what you need—to your schedule, on time, in shipments that work for you. To find out more about our single phase autotransformers, three phase autotransformers, or other products, call us at (800) 826-9741.
Transformers are vital components of electrical usage that transfer electrical energy from one electrical circuit to another. They change current to make it capable for an application. The typical transformer has two windings, with one being the primary winding which draws in energy, and the other being the secondary winding for transmitting this energy. Autotransformers have a different configuration with one winding serving as both the primary and secondary winding. This configuration is just as effective, but less expensive.
Johnson Electric Coil Company is one of the primary companies for the production of transformers and produces single and three-phase autotransformers made of highly durable components to fit a wide range of applications. Their devotion to excellence and high-quality products includes both their in-stock autotransformers as well as ones they custom design to meet their customers’ unique requirements.
One of the problems associated with long power lines is voltage drop, especially with applications that draw a great deal of current. Autotransformers are used to compensate for the drop in voltage in order to keep equipment operating at peak efficiency.
Another, very common, use for autotransformers is in the starting of large AC motors to keep the potential voltage difference reduced at startup. Autotransformers hold the motor at the start-up level until the motor reaches 75% of its rated speed where the motor is then switched over to its full potential.
There are an endless number of benefits to the use of autotransformers. Some of those benefits include:
- Save on Copper: Autotransformers use just one copper winding and, as a result, far less copper wire than traditional transformers of the same rating. This reduces the cost of manufacturing.
- Single Winding: The single winding of autotransformers reduces their size & weight, which gives them greater flexibility for use in a wide variety of applications.
- VA Rating: The smaller size and weight of autotransformers enables them to have a higher VA rating.
- Voltage Regulation: Since autotransformers have a single wind, they do not suffer a voltage loss due to the second winding.
- Efficiency: The second winding of a two winding transformer creates losses due to electrical conduction, magnetic induction, and reduction. Since an autotransformer does not have the second winding and subsequent losses, it operates more efficiently.