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1.1 History of Technology and Inductelec Ltd
When the “company” was formed over 40 years ago most of the item manufacturers were still using oscillator valves (Thermonic Tubes) to generator powers at the higher frequencies 100KHz and above the motor generator was under fire from solid state technology at the lower frequency say 3KHz to 10 KHz. The three partners were all experienced engineers and had worked for Radyne Ltd and Electroheat.

At the outset the company was mainly interested in servicing the tube tyre generators and motor generators. However in the first 3 months we realised the same customers were also interested in purchasing new plant. We contacted one of the existing manufactures Electroheat and arranged to buy in their power units and we would engineer the front end. This seemed a solution to the problem but we soon realised we were going to have to design and build our own power unit to meet the demand.

Having decided we needed our own in house capability the first generator we built was a 6Kw Thyrister power controlled unit using a suitable water cooled tube. There were many innovations incorporated in the design including, sealed cabinet with internal heat exchanger and fan to recycle the air which precluded the ingress of dirt which at the time was a major cause of breakdowns, due to high voltage flashovers.

The power unit was very well received by our customers and we continue to design bigger and better power units ending up with a complete range of units from 6Kw to 100Kw output in the frequency range 200KHz to 2MHz. We also by the time had made contact with PILAR USA and we were importing static inverters for assembly in the UK. This meant we had the complete range of frequencies from 1KHz up to 10 KHz at power outputs from 15KW up to 300KW.

We eventually designed our own medium frequency capability and created another company called Inductelec MF here in Sheffield. We continued to improve and manufacture high frequency and medium frequency power units for several years.

Ultimately it was decided we should try to replace the old tube technology by solid state power units this we undertook to do and by the time the market place was ready we had a range of solid state power sources to meet requirements.

During this same period we had also expanded by creating Inductelec Midlands in Birmingham, Inductelec N.E in Newcastle and purchased a general engineering company Nortal Ltd to enable us to manufacture handling systems. At this stage we were employing 50 people consisting of engineer fitters, wire men, sales representatives and service engineers. All the while the demand for our equipment was increasing and we were now exporting equipment to South Africa, India, Tai Wan, Portugal, Spain, Germany, Sweden.

In 1972 the parent company had moved into the factory on Carlisle Street where we have approximately 15,000 sq ft of factory and office space. We have modified the layout of the factory to accommodate our engineer company and we have made savings in travelling cost and management.

We have continued to design and re-design our range of products so today we have a complete range of power units of the very latest design and technology ranging from:

• 5Kw upto 60Kw at high frequency
• 50Kw upto 500Kw at medium frequency

1.2 List of applications already using induction heating
There are many applications of Induction Heating Equipment across many sectors.

• Shrink Fitting
• Sample Melting
• Shaft Hardening
• Skin Hardening
• Chisel Hardening
• Paint Drying
• Hammer Hardening
• Forging Small Tools
• Wire Rope Heat Treat
• Forging Hydraulic Fittings
• Auto Parts Heat Treat
• Silver Soldering
• Annealing
• Post Annealing
• Hard Facing
• Engine Valve Manufacture
• Strip Heating for Coating
• Hardening Gears & Pins
• Strip Heating & Hardening
• Research Projects
• Ice Skate Brazing
• Forging Drilling equipment
• Hot Pressing
• Collaring
• Hack Saw Blade Hardening
• Saw Black Hardening
• Silver Solder Contacts
• Annealing Copper

1.3 Why from Inductelec Ltd?
Over the last 40 years we have developed a whole range of solid state power units and where necessary handling systems to increase productivity. We have developed systems to suit customer’s requirements and work space layouts. We can demonstrate here in our factory and produce samples for metallurgical inspection. If you wish to discuss a project we would visit you for technical discussions prior to quotation or you are welcome to come to our factory for a practical demonstration.