{"id":78,"date":"2026-03-28T12:18:36","date_gmt":"2026-03-28T12:18:36","guid":{"rendered":"http:\/\/localhost:10004\/?page_id=78"},"modified":"2026-04-06T09:10:29","modified_gmt":"2026-04-06T02:10:29","slug":"%e0%b8%84%e0%b8%a5%e0%b8%b1%e0%b8%87%e0%b8%84%e0%b8%a7%e0%b8%b2%e0%b8%a1%e0%b8%a3%e0%b8%b9%e0%b9%89","status":"publish","type":"page","link":"https:\/\/proinduct.co.th\/en\/%e0%b8%84%e0%b8%a5%e0%b8%b1%e0%b8%87%e0%b8%84%e0%b8%a7%e0%b8%b2%e0%b8%a1%e0%b8%a3%e0%b8%b9%e0%b9%89\/","title":{"rendered":"Knowledge Base"},"content":{"rendered":"
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Knowledge Base<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"Induction\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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\u0e2b\u0e25\u0e31\u0e01\u0e01\u0e32\u0e23\u0e17\u0e33\u0e07\u0e32\u0e19\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e2d\u0e34\u0e19\u0e14\u0e31\u0e01\u0e0a\u0e31\u0e48\u0e19\u0e2a\u0e4c\u0e2e\u0e35\u0e15\u0e40\u0e15\u0e2d\u0e23\u0e4c (Induction Heater)<\/a><\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Frequency <\/a><\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Power (Watt \/ Kilowatt - kW)<\/a><\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Induction Coil<\/a><\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Induction Heater Working Principle<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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An Induction Heater is a heating device that utilizes electromagnetic induction to generate heat internally directly within a conductive metal workpiece<\/b> , without direct contact with the heating element and without using an open flame.<\/p>

The operation relies on two combined physics principles: Electromagnetic Induction<\/b> and Joule Heating<\/b><\/p>

The step-by-step process is as follows:<\/p>

  • Create an alternating magnetic field:<\/b> High-frequency alternating current (AC) is passed through a copper coil (Induction Coil), creating a rapidly changing magnetic field around it.<\/p><\/li>

  • Induce electrical current:<\/b> When a conductive metal workpiece is placed within this magnetic field, it induces a circulating electrical current inside the metal (Eddy Current).<\/b><\/p><\/li>

  • Convert current to heat:<\/b> Because metal naturally has Electrical Resistance, the high-volume eddy current flowing against this resistance generates significant energy loss, which converts rapidly into heat.<\/p><\/li>

  • Heat from molecular friction (Hysteresis Loss - for magnetic materials only):<\/b> If the workpiece is magnetic, such as steel, additional heat is generated from the rapid internal friction of magnetic domains aligning with the changing magnetic field.<\/p><\/li><\/ul>

    Advantages of this principle:<\/b><\/p>

    • Fast and precise heating:<\/b> Heat is generated directly within the workpiece, preventing energy loss to the surroundings.<\/p><\/li>

    • Precise control:<\/b> Heating locations and target temperatures can be easily and accurately controlled.<\/p><\/li>

    • Safe and clean:<\/b> No open flames, no smoke, and the copper coil itself does not get hot (due to internal water cooling).<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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      Frequency <\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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      In induction heating systems, a physics phenomenon known as the \u201cSkin Effect\u201d<\/strong> occurs. Simply put, the higher the frequency of the electrical current, the more the eddy currents and resulting heat will concentrate only on the surface of the metal.<\/p>

      We can categorize frequency ranges and their applications into 3 main levels:<\/p>

      1. High Frequency (100 kHz \u2013 500 kHz or higher)<\/strong><\/li><\/ol>
        • Heating Characteristics:<\/strong> Heat is highly concentrated on the surface of the workpiece<\/strong> (shallow penetration, typically 1-2 millimeters).<\/li>
        • Suitable for:<\/strong> Small or very thin workpieces, such as wires or small tubes.
          • Surface Hardening: Hardening only the metal surface while keeping the core tough and ductile<\/li>
          • Brazing: Joining small components that require fast, localized heat to finish the job quickly.<\/li><\/ul><\/li><\/ul>
            1. Medium Frequency (1 kHz \u2013 50 kHz)<\/strong><\/li><\/ol>
              • Heating Characteristics:<\/strong> Heat penetrates deeper into the metal core (approximately 2-10 millimeters, depending on the material).<\/li>
              • Suitable for:<\/strong>
                • Hardening workpieces that require a deeper case hardness, such as medium-sized shafts or gears.<\/li>
                • Melting metals in medium-sized induction furnaces.<\/li>
                • Shrink Fitting: Uniformly heating parts prior to assembly.<\/li><\/ul><\/li><\/ul>
                  1. Low Frequency (50 Hz \u2013 1 kHz)<\/strong><\/li><\/ol>
                    • Heating Characteristics:<\/strong> Low-frequency current can penetrate very deeply, allowing heat to thoroughly reach the core<\/strong> of the workpiece.<\/li>
                    • Suitable for:<\/strong>
                      • Very large and thick workpieces.<\/li>
                      • Forging applications that require steel billets to be heated completely red-hot through to the center.<\/li>
                      • Melting large quantities of metal in heavy industrial foundries.<\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                        Power (Watt \/ Kilowatt - kW)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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                        It determines the “<\/strong>\"speed\"<\/strong> and “<\/strong>\"amount of heat\"<\/strong> the machine can generate.<\/p>

                        Think of it simply: the machine's power is like the intensity of a gas stove. A higher power flame heats the workpiece faster, or can heat larger workpieces in a shorter amount of time.<\/p>

                        Main factors determining <\/strong>the machine's required power (kW):<\/strong><\/p>

                        Choosing whether to use a 15 kW, 50 kW, or 100+ kW induction machine depends on these 4 main variables:<\/p>

                        • Mass & Volume:<\/strong> A larger, heavier workpiece requires significantly more energy to raise its temperature. If a low-power machine is used on a massive workpiece, the generated heat might dissipate into the surrounding air faster than the machine can input heat, preventing the workpiece from ever reaching the target temperature.<\/li>
                        • Target Temperature:<\/strong> Different applications require different temperatures. For example, Brazing copper pipes at around 600-800\u00b0C naturally requires less power than Melting steel, which demands pushing the heat beyond 1,500\u00b0C.<\/li>
                        • Heating Time:<\/strong> This is highly critical in industrial production lines. If a factory needs a steel billet red-hot and ready for Forging within just 5 seconds, an extremely high-power machine is required. However, if the workflow allows for a gradual heat-up over 1 minute, a lower-power machine can be used, saving a massive amount of budget on equipment costs.<\/li>
                        • Material Properties:<\/strong> Ferrous, magnetic materials like \"Steel\" respond and absorb energy from the magnetic field exceptionally well, thus requiring less power. However, if the workpiece is \"Copper\" or \"Aluminum,\" which are non-magnetic and excellent electrical conductors, their internal material resistance is very low, making them difficult to heat. You may need to multiply the machine's power by 2-3 times to achieve the same heat as heating steel.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                          Induction Coil<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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                          The most critical principle of coil design is: \"The magnetic field is strongest closest to the coil.\"<\/b> Therefore, we must design the coil's shape to perfectly match the contour of the target heating area on the workpiece.<\/p>

                          The material used is hollow copper tubing<\/b> (not solid wire) to allow cooling water to flow through it constantly during operation. This prevents the copper coil from melting due to the massive electrical current and radiated heat from the workpiece.<\/p>

                          Common coil designs used in the industry include:<\/p>

                          1. Helical Coil \/ Solenoid Coil<\/h3>

                          • Characteristics:<\/b> Copper tubing wound in multiple circular turns, resembling a spring. This is the most common standard shape.<\/p><\/li>

                          • Application:<\/b> Ideal for long cylindrical workpieces such as shafts, steel pipes, or heating billets before forging. The heat surrounds the workpiece evenly.<\/p><\/li><\/ul>

                            2. Pancake Coil<\/h3>

                            • Characteristics:<\/b> The coil is wound flat in a single plane, similar to a mosquito coil.<\/p><\/li>

                            • Application:<\/b> Used for heating flat surfaces,<\/b> or when heating is required only on one specific side (e.g., a metal plate, end of a blade, or heating the bottom of a pan in induction stoves).<\/p><\/li><\/ul>

                              3. Internal \/ Bore Coil<\/h3>

                              • Characteristics:<\/b> The coil is designed to fit inside the bore or inner diameter of a workpiece. \u0e14\u0e49\u0e32\u0e19\u0e43\u0e19<\/b> \u0e02\u0e2d\u0e07\u0e0a\u0e34\u0e49\u0e19\u0e07\u0e32\u0e19\u0e17\u0e35\u0e48\u0e21\u0e35\u0e23\u0e39\u0e40\u0e08\u0e32\u0e30\u0e15\u0e23\u0e07\u0e01\u0e25\u0e32\u0e07<\/p><\/li>

                              • Application:<\/b> Used for hardening or heating the internal surface of a cylinder, bore, or pipe joint. This is an area where standard external coils cannot project the magnetic field effectively.<\/p><\/li><\/ul>

                                4. Hairpin \/ U-Shape Coil<\/h3>

                                • Characteristics:<\/b> The copper tubing is bent into a long U-shape, resembling a bobby pin.<\/p><\/li>

                                • Application:<\/b> Application: Used for applications requiring heat on a very narrow or localized area,<\/b> such as brazing small pipe joints or spot heating.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                                  Cooling water<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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                                  The Forgotten Heart: Why the Cooling Water System is a Matter of Life and Death for Induction Heaters?<\/p>

                                  When discussing Induction Heaters, most people focus on the Power Board or Coil Design. In reality, these components wouldn't survive for more than 10 seconds without the most critical system: the Cooling Water System.<\/b><\/p>

                                  1. The Massive Heat Load in Copper Tubes<\/b> During operation, the induction coil carries hundreds to thousands of amps of high-frequency alternating current. Although copper is an excellent conductor, it still possesses inherent resistance. This causes severe internal heat accumulation according to Joule's first law (P = I2R<\/span>). Coupled with the \"Radiant Heat\" emitting from the 1,000+ \u00b0C red-hot workpiece, if the cooling water flow is insufficient, the copper tube will melt and rupture in the blink of an eye.<\/p>

                                  2. The Silent Killer: Scale Buildup<\/b> A classic problem in industrial plants is using substandard water. Hard water causes Calcium\/Magnesium Scale<\/b> to build up on the inner walls of copper tubes and Heat Exchangers. Just 1 millimeter of scale acts as an excellent \"Thermal Insulator.\" It prevents the water from absorbing heat from the copper, leading to sudden machine Overheating and Water Flow Fault alarms.<\/p>

                                  3. Electrical Conductivity: A Small Detail that Ruins Boards<\/b> Cooling water flowing through high-power electronic components (like IGBTs or SCRs) must be Deionized Water with extremely low conductivity (typically below 10 - 50 uS\/cm<\/span>). If the system water is dirty or contaminated with minerals, it becomes a conductor. This leads to Short Circuits or Electrolysis, heavily corroding the components from the inside out.<\/p>

                                  4. Comprehensive Cooling Water Maintenance by ProInduct<\/b> Don't wait for Fault Code alarms or melted coils to cause severe production Downtime. ProInduct Co., Ltd. offers full-scale cooling water system PM services:<\/p>

                                  • Chemical Descaling for induction coils and cooling pipes.<\/p><\/li>

                                  • Heat Exchanger cleaning to restore optimal Flow Rate.<\/p><\/li>

                                  • Inspection and calibration of Flow Switches and Pressure Drop sensors.<\/p><\/li>

                                  • Industrial cooling water quality improvement consulting.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                                    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t080-431-9966<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
                                    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tprachara@proinduct.co.th<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

                                      \u0e04\u0e25\u0e31\u0e07\u0e04\u0e27\u0e32\u0e21\u0e23\u0e39\u0e49 (Knowledge Hub) \u0e2b\u0e25\u0e31\u0e01\u0e01\u0e32\u0e23\u0e17\u0e33\u0e07\u0e32\u0e19\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e2d\u0e34\u0e19\u0e14\u0e31\u0e01\u0e0a\u0e31\u0e48\u0e19\u0e2a\u0e4c\u0e2e\u0e35\u0e15\u0e40\u0e15\u0e2d\u0e23\u0e4c (Induction Heater) \u0e04\u0e27\u0e32\u0e21\u0e16\u0e35\u0e48 (Frequency) \u0e01\u0e33\u0e25\u0e31\u0e07\u0e44\u0e1f (\u0e27\u0e31\u0e15\u0e15\u0e4c) \u0e2b\u0e23\u0e37\u0e2d\u0e1b\u0e23\u0e34\u0e21\u0e32\u0e13\u0e27\u0e31\u0e15\u0e15\u0e4c (Watt \/ Kilowatt – kW) \u0e02\u0e14\u0e25\u0e27\u0e14\u0e40\u0e2b\u0e19\u0e35\u0e48\u0e22\u0e27\u0e19\u0e33 (Induction Coil) \u0e23\u0e30\u0e1a\u0e1a\u0e19\u0e49\u0e33\u0e2b\u0e25\u0e48\u0e2d\u0e40\u0e22\u0e47\u0e19 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-78","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/proinduct.co.th\/en\/wp-json\/wp\/v2\/pages\/78","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/proinduct.co.th\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/proinduct.co.th\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/proinduct.co.th\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/proinduct.co.th\/en\/wp-json\/wp\/v2\/comments?post=78"}],"version-history":[{"count":91,"href":"https:\/\/proinduct.co.th\/en\/wp-json\/wp\/v2\/pages\/78\/revisions"}],"predecessor-version":[{"id":250,"href":"https:\/\/proinduct.co.th\/en\/wp-json\/wp\/v2\/pages\/78\/revisions\/250"}],"wp:attachment":[{"href":"https:\/\/proinduct.co.th\/en\/wp-json\/wp\/v2\/media?parent=78"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}