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Variacs
Variacs or Variable transformers have been used since the 1930 and are the most versatile and reliable voltage controls available. Variacs were probably the first transformer to use a true toroidal core. They are two types of variacs. One is a transformer consisting of a single layer of magnet wire winding on a toroidal core of laminated silicon steel. A track is machined around the toroid periphery. A Carbon brush, connected to the output lead, rotated around this track, bringing variable output voltage to a separate terminal. The other Variacs works as an induction type, which does not use brushes. It uses two separate windings, a primary and a secondary. The windings are wrapped through its center. The enameled windings are wound tightly around the core with each end securely fastened and lacquered to the core. The enamel winding plays an important role, insulation is removed when there is contact with the carbon on the slider. The enamel removal forms the circuit voltage that is pulsed through parts of the winding. AC voltage is applied across a portion of the winding, and a step up or step down voltage is produced across another portion of the same winding. There are two types of Variacs the bench models and the open frames types. The bench model is a ventilated mental shield, with the control knob on top. The shield type is usually cylindrical in shape, like a soda can, and sits on a counter top. Check out our types of variacs for more in depth information and what type of applications there are used for. Most Variacs are wired in a configuration yielding a higher voltage out than applied as input voltage. In general, the increased voltage is 15% above the applied voltage, where output can be varied between 0 volts and 15% above the input voltage. Variacs are used to step up 120 volts to 280 volts or more. It can also be used to take a 240 volt to achieve 280 volts from 120 volt input. Variacs applications are used in many industrial and laboratory applications to control voltage, current, power, heat, speed, light, and electromechanical force. When choosing a Variacs always look for companies that you can trust and provide you with a quality variac transformer. Some guidelines is to look for companies that at least been in business for 5 years or longer, offers excellent warranties, and have the engineering staff to answer all your questions. Our main goal on this site is to give you the basic information on Variacs and how they work. We provide information on how Variacs are construction to finding a Variac manufacturer. Before investing in an variac transformer, make sure you understand how they work and educate yourself. Our site is a fine place to start and TEMCo is the right company to help you with your variacs. TEMCo is a power source leader and has been in business for over 25 years. They pride themselves in offering quality products backed by a trained, knowledgeable, staff that is standing by to answer all your questions concerning your variac transformer or any other power source questions. TEMCo carries a full line of variacs, with most products shipped within 24 hours. They not only offer only quality variacs, but has the lowest prices, so give the team at TEMCo a call today!! Find out why so many companies only use TEMCo for all their power source needs.
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