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General Transformer Information

Why are transformers required?

The transformer’s main purpose is to change one form of voltage to another, making it possible to operate a great variety of loads at their suitable voltages. The coils are usually wound on a core of laminated electrical steel or ferrite magnetic material. Below are just a few of the different styles of transformers used in the induction-heating industry.

Sizing and Specifying Transformers

To properly size or specify a transformer the following information is generally required: the input voltage to the transformer, kW of the power source, the frequency range of the power source and the frequency range at which the transformer will operate, the turns ratio or the output voltage required at full load (or no load), the input kVA at the minimum and maximum turns ratio, expected efficiency (based on the kW rating of the power source) or the kW loss of the transformer. It is also helpful to know any unique characteristics of the power source, type of waveform, or if any DC will be present. The more information the designer has available, the more assurance the customer has of getting the proper and most efficient transformer.

Transformer Maintenance

As a general rule, when transformers are water-cooled, most of the failures occur because of a breakdown of the insulation between the windings. Normally this is due to lack of water, poor quality water, water-inlet temperature being too high, or operating the transformer outside of its designed rating. Insulation failure is sometimes caused by the harsh environment the transformer is subjected to. Another failure that commonly occurs would be the melting of the output connection (fishtail), which is caused by improper tightening (recommended torque is 30 to 40 ft/lb.), or maintenance on the inductor, which includes dirty and oxidized surfaces on the mating inductor or Fishtail surface. There are occurrences when the core fails. Again, this may be due to the lack of water, poor quality water, the input volts per turn are too high (exceeds core loss temperature limitation), and improper use of frequency. One of the best investments you can make is in a well-designed water system. This will pay for itself with reduced component failures and reduction of downtime. Proper maintenance at the inductor and transformer connections will also help greatly.

Price: $0.00

Low/Line Frequency Transformer

For frequencies of 50 Hz to 400 Hz, see more details for further information on the Jackson Line Frequency Transformer.

Additional DescriptionMore Details

For frequencies of 50/60 Hz, specify a JACKSON Line Frequency Transformer.

JACKSON Line Frequency Transformers are customized to meet customer requirements, and are available in various ratings. All designs are optimized utilizing our exclusive computer programs to ensure the highest quality product.

Available from 120 to 6500 volts, 5 kVA to 3000 kVA.

Available in Single or Three Phase.

Available in a NEMA type enclosure or open frame.

JACKSON Line Frequency Transformers are available in dry type or water-cooled construction.

The water-cooled copper windings utilize a unique construction allowing for a compact and efficient design.

Cores are manufactured using high quality silicon steel with very low core loss and low exciting current.

Input and output connections can be designed to meet specific requirements.

Available in Metric or Standard U.S. Threads.

For a high quality customized Line Frequency Transformer – Specify a JACKSON

Download our Low Frequency Transformers Brochure

Price: $0.00

Medium Frequency Transformer

For frequencies of 500 Hz to 10 kHz that require a load matching/work station transformer, see more details for further information on the Jackson Medium Frequency Transformer.

Additional DescriptionMore Details

The JACKSON Load Matching/Work Station Transformers are customized to meet customer requirements and are available in various ratings to match the appropriate load. All designs are optimized utilizing our exclusive computer programs to ensure the highest quality product.

The JACKSON Load Matching/Work Station Transformers are the standard in the induction heating industry and are a proven quality product with hundreds of designs and thousands of units operating continuously throughout the world since 1955.

Available from 200 to 4000 volts, 200 Hz to 25 kHz, up to 20,000 kVA.

The water-cooled copper windings utilize a unique interleaved construction, which allows for a compact and efficient transformer.

Windings are available in either open or encapsulated design.

The water-cooled cores are made utilizing special thin electrical-grade steel to minimize core and eddy current losses.

Tap changing is made easy with the JACKSON uniquely designed swing link tap changing arrangement.

Input and output connections can be designed to meet your specific requirements.

Available in Metric or Standard U.S. Threads.

The JACKSON variable ratio Load Matching/Work Station Transformer delivers a massive amount of power in a small package.

For a high quality customized Load Matching/Work Station Transformer – Specify a JACKSON.

Download our Medium Frequency Transformer Brochure

Price: $0.00

KHZ High Frequency Transformer

For frequencies of 10 kHz and above, see more details for further information on the Jackson KHZ Transformer.

Additional DescriptionMore Details

For frequencies of 10 kHz and above, specify a JACKSON KHZ Transformer.

JACKSON KHZ Transformers are customized to meet customer requirements and are available in various ratings to match the appropriate load. All designs are optimized utilizing our exclusive computer programs to ensure the highest quality product.

The JACKSON KHZ Transformer is the standard in the induction heating industry and is a proven quality product with hundreds of designs and thousands of units operating throughout the world since 1975.

Available from 50 to 3000 volts, 10 kHz to 2000 kHz to over 4000 kVA.

JACKSON KHZ Transformers are available in either open or encapsulated designs.

The water-cooled copper windings utilize a unique interleaved construction allowing for a compact and efficient transformer.

The cores are manufactured using special ferrites that have very low core loss, low exciting current, and lower costs than high performance steels.

Tap changing is made easy with the JACKSON uniquely designed swing link tap changing arrangement, side buss, or straight terminals.

Input and output connections can be designed to meet your specific requirements.

Available in Metric or Standard U.S. Threads.

For a high quality customized KHZ Transformer- Specify a JACKSON .

Download our KHZ High Frequency Transformer Brochure

Price: $0.00

Toroidal Transformer

For isolation or auto transformer designs in frequency range of 200 Hz to 25 kHz, see more details for further information on the Jackson Toroidal Transformer.

Additional DescriptionMore Details

JACKSON Toroidal Transformersare customized to meet customer requirements and are available in various ratings to match the appropriate load. All designs are optimized utilizing our exclusive computer programs to ensure the highest quality product.

The JACKSON Toroidal Transformer is a proven quality product with thousands of units operating throughout the world since 1966.

Available from 200 to 4000 volts, 200 Hz to 25 kHz, up to 3000 kVA and are available as isolation (TV) or auto transformers (TA).

JACKSON Toroidal Transformers are totally encapsulated for use in any environment and are vibration free.

The windings are made of copper tubing and are water-cooled.

The water-cooled toroidal cores are made utilizing special thin electrical-grade steel to minimize core and eddy current losses.

Tap changing is made easy with the JACKSON uniquely designed swing link tap changing arrangement or straight terminals.

Input and output connections can be designed to meet your specific requirements.

Available in Metric or Standard U.S. Threads.

For a high quality customized Toroidal Transformer – Specify a JACKSON.

Download our Toroidal Transformer Brochure

Price: $0.00

Rectangular Transformer

For rectangular style transformers in the frequency range of 400 Hz to 100 kHz, see more detail for further information on the Jackson Rectangular Transformer.

Additional DescriptionMore Details

JACKSON Rectangular Transformers are customized to meet customer requirements and are available in various ratings to match the appropriate load. All designs are optimized utilizing our exclusive computer programs to ensure the highest quality product.

The JACKSON Rectangular Transformer is a proven quality product with hundreds of units operating continuously throughout the world since 1969.

Available from 200 to 3000 volts, 400 Hz to 100 kHz, up to 10,000 kVA and are available as isolation (RV) or auto transformer (RA).

JACKSON Rectangular Transformers are available in either open or encapsulated designs.

The water-cooled copper windings utilize a unique interleaved construction allowing for a compact and efficient transformer.

For frequencies up to 10 kHz, the water-cooled rectangular shaped cores are made utilizing special thin electrical-grade steel to minimize core and eddy current loses.

For frequencies above 10 kHz, the cores are manufactured using special ferrites that have very low core loss and low exciting current.

Tap changing is made easy with the JACKSON uniquely designed swing link tap changing arrangement or straight terminals.

Input and output connections can be designed to meet your specific requirements.

Available in Metric or Standard U.S. Threads.

For a high quality customized Rectangular Transformer – Specify a JACKSON.

Download our Rectangular Transformer Brochure

Price: $0.00

R.F. Transformer

For frequencies of 300 kHz to 600 kHz with input of approximately 10,000 volts that requires a radio frequency transformer (generally referred to as a R.F. Current Transformer), see more details for further information on the Jackson R.F. Transformer.

Additional DescriptionMore Details

The JACKSON R.F. Transformer is an air core device designed without core material and is normally referred to as a R.F. Current Transformer.

The JACKSON R.F. Transformer is typically used in vacuum tube power supplies.

The input voltage to the JACKSON R.F. Transformer is usually 10,000 volts or higher.

The primary of the transformer is usually wound with round tubing while the secondary consists of a solid copper sheet wrapping and shielding the primary inside the secondary.

Generally the primary winding is encapsulated in RTV material, which gives high dielectric strength and also protects it from the environment.

Great care is exercised in the construction and selection of material when designing and building the JACKSON R.F. Transformer and is constructed in a clean environment. The critical element in the design is to obtain the highest current transfer ratio between the primary to secondary l1 / l2. And K= √- (LL / LO).

Where LL= the leakage inductance referred to the primary

LO – the open circuit inductance of the transformer

The greatest current transfer occurs when L3/ L2= √1 – Kλ2

The kVA transfer is greater than L2 = L3

Available in Metric or Standard U.S. Threads.

For a high quality customized R.F. Transformer – Specify a JACKSON .

Download our RF Transformers Brochure

Price: $0.00

Narrow Profile Transformer

For frequencies of 5 kHz to 40 kHz that require a narrow width transformer, see more details for further information on the Jackson Narrow Profile High Frequency Transformer.

Additional DescriptionMore Details

JACKSON Narrow Profile High Frequency Transformers are customized to meet customer requirements and are available in various ratings to match the appropriate load. All designs are optimized using our exclusive computer programs to ensure the highest quality product.

A series of narrow profile transformers can be placed in a side-by-side relationship for simultaneously induction heating a plurality of different bearing surfaces located on a long shaft, such as the bearing surfaces of a crankshaft of an engine.

Available from 500 to 2000 volts, frequency from 5 kHz to 40 kHz up to 1500 kVA.

JACKSON Narrow Profile Transformers are water-cooled copper windings that utilize a unique interleaved construction allowing for a compact and efficient Transformer.

Our transformers are manufactured using ferrite core construction that have low exciting current and lower core losses than high performance steels.

JACKSON Narrow Profile Transformers are encapsulated for protection from the harsh environment and physical abuse.

Input and Output connections can be designed to meet your specific requirements.

Available in Metric or Standard U.S. Threads.

For a high quality customized Narrow Profile High Frequency Transformer – Specify a JACKSON.

Download our Narrow Profile High Frequency Transformer Brochure

Price: $0.00

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