Induction Cooking - History of Induction Cooker

Induction cooking is a method of cooking where induction heating is used to directly heat a cooking vessel. With induction heating, a ferromagnetic material is heated by electromagnetic induction when a current that is inducted in the material, from an outer electric source, produces heat through resistive heating. That is why a cooking vessel must be made of a ferromagnetic metal, or, if not, to be placed on an interface disk which is made of the same type of metal.

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Induction cooker has a coil of copper wire placed underneath the cooking pot and alternating electric current flows through it. Even the first patents for induction cookers that appeared at the beginning of the 20th century had the same principle. From that moment until the s, induction cooking appeared only as a demonstration of technology and was used primarily for annealing metal in industrial applications but it was not in general use. At the Chicago "Century of Progress" World's Fair in , induction cooking technology was introduced to the world. Frigidaire, a division of General Motors, demonstrated induction cookers on a touring GM showcase in North America in the mid-s.

Research & Development Center of Westinghouse Electric Corporation developed the first modern induction stoves in America in the early s. These were for the first time put on public display at the National Association of Home Builders convention in Houston, Texas. They were of stand-alone single-burner type and were called the Cool Top Induction Range. From this type, the first series was developed called Cool Top 2 (CT2) Induction range. The development work was done at the same Research & Development Center and a team was led by Bill Moreland and Terry Malarkey. Market price of an individual induction stove was $1,500. It included a of high quality cookware made of so called Quadraply, which is a type of laminate made of layers of stainless steel, carbon steel and aluminum. Cool Top 2 (CT2) Induction range had four burners of about 1,600 watts each, and was in production from to . Sears Kenmore, an exclusive brand of household appliances established by Sears, sold their free-standing oven/stove with four induction-cooking surfaces in the mid-s. These early induction stoves had low power, reliability and noise problems. American manufacturers made their last induction stoves for home use in . Europe and Asia continued to develop their variants and US manufacturers like Cooktek and Luxine continued to develop commercial units used in the food service industry. Panasonic developed an all-metal induction cooker in . It can use non-ferrous metal cookware but it has reduced coupling efficiency and with that can produce less heat.

Induction cookers provide rapid heating, have improved thermal efficiency and can be controlled like gas stoves. Induction plate is cold when in use and has no open flame which makes it safer. Induction cookers also have control systems that shut down the element if a pot is not present or not large enough.

Limitation of induction cooker is that cookware must be compatible for this kind of use. Glass and ceramics cannot be used as well as solid copper or solid aluminum (except on all-metal induction cookers). Glass ceramic top a stove can be damaged by impact. Aluminum foil can melt onto the top and cause permanent damage or cracking of the top.

History of Electromagnetic Induction Heating

Electromagnetic induction is the production of an electric current across a conductor in a changing magnetic field. The principle of electromagnetic induction was discovered by Michael Faraday in and published in . He conducted several experiments to demonstrate the phenomenon, such as wrapping two wires around opposite sides of an iron ring, sliding a bar magnet in and out of a coil of wires, and rotating a copper disk near a bar magnet. He also coined the term &#;lines of force&#; to describe the magnetic field.

Electromagnetic induction heating was discovered by Michael Faraday

  Electromagnetic induction heating is a specific application of electromagnetic induction, where an electric current is induced in a conductive material to heat it up. The first induction heating device was invented by Elihu Thomson in , who patented an induction furnace for melting metals. He also demonstrated induction heating for various purposes, such as welding, soldering, annealing, and lighting. Induction heating was further developed by other inventors and engineers in the 20th century, such as Albert. Metcalfe, Edwin F. Northrup, Hans Bredow, and Nikola Tesla.

How does Electromagnetic Induction Heating Work?

Electromagnetic induction heating is a process of heating electrically conductive materials, such as metals, semiconductors, or composites, by generating electric currents inside them through an alternating magnetic field. The magnetic field is created by passing a high-frequency alternating current through an induction coil or an electromagnet. The heating effect is due to the resistance of the material to the currents, called Joule heating, or the movement of dipoles in the matrix, called dielectric heating. Electromagnetic induction heating can be used for various applications, such as melting, heat treating, brazing, soldering, bonding, curing, or welding.

Electromagnetic Induction Heating

What are the Advantages of Electromagnetic Induction Heating?

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Some of the advantages of Electromagnetic induction heating are:

Improved process efficiency: Induction heating can heat objects very rapidly and precisely, with minimal wasted heat and energy.

Localized, constant, and precise heating: Induction heating can target specific areas of the object without affecting the surrounding parts or materials. This reduces collateral damage and improves quality.

Temperature control: Induction heating can be adjusted to achieve the desired temperature for different applications, such as melting, heat treating, brazing, soldering, etc.

Energy saving: Induction heating does not require gas tanks or servicing costs, and can salvage parts that would otherwise be discarded. It also reduces heat losses from the surfaces that would provide electrical connections.

Possibility of integration into production lines: Induction heating can be easily automated and controlled by electronic devices, making it suitable for industrial processes.

Best quality and yield/performance: Induction heating can produce consistent and uniform results, avoiding uneven heating and inconsistent outcomes that are common with gas torches.

Pollution-free, fast, and secure technology: Induction heating does not emit hazardous emissions or flames, making it safer for the environment and the workers. It also reduces the risk of injury and damage to the tools.

Improved working environment: Induction heating does not create noise, smoke, or dust, making it more comfortable and clean for the operators.

Electromagnetic Induction Heating Machine Videos

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