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Medium Frequency Capacitor for Inductive Heating Circuits | China Suppliers & Factory
General introduction
The induction heating&melting capacitor is specially designed for induction heating furnace. It generates current inside the conductor through a high-frequency electric field to achieve rapid heating effect. This capacitor has an efficient energy conversion rate and enable to convert the input electrical energy into heat energy very fast, thus achieving rapid heating/melting of the metals.
| Dielectric material | PP film |
| Insulation liquid | biodegradable,non-PCB |
| Maximum allowable voltage | Rated voltage×1.05 (12 hours/day) |
| Maximum allowable current | Rated current×1.15 |
| Tanδ | Less than 0.1%(1W/Kvar) |
| Ambient air temperature | -20~40℃ for natural cooling or force ventilated; -20~50℃for water cooling |
| Inlet Cooling water temperarture | lower than 30℃ |
| Outlet cooling water temperature | lower than 45℃ |
| Installtion | Indoor, please advise if you want to install horizontally, special design requires for Horizontal position。 |
| Case | Alumium case |
Working principle
The working principle of the induction heating/melting capacitor is based on the principles of electromagnetic induction and capacitor energy storage. When the high-frequency AC power supply is connected to the capacitor, the high-frequency electric field will be generated inside the capacitor. This high-frequency electric field generates an induced current on the surface of the metals being heated. We call this vortex as well, the vortex/currents covert electrical energy into thermal energy, thus enabling rapid heating happens in the whole induction furnace system.
The capacitor design structure
Considering the various factors,such as capacity, working voltage, frequency, current etc. The capacitor consist of electrode, capacitor core and insulation materials, cooling water tubes.
Electrode: it connect to the power system, so the current will pass through smoothly.
The insulation materials: It guarantee the capacitor safety, prevent the capacitor from the electric leakage or breakdown.
Cooling water tubes: the cooling water help to control the capacitor temperature.
The application superiority of the induction heating capacitors
- Fast heating rate: achieve fast heating rate through the induced current being generated by high-frequency electric field;
- High energy efficient: convert most of electric energy to heat energy, less energy loss;
- Reliable: apply for mature insulation and heat dissipation technology, the equipment is capable of working continuously for long time;
- Environmental protection: no need fuel, no exhaust gas generated during the production;
- Optimized Matching: Reasonable design and selection can optimized the matching of water-cooed capacitors and medium-frequency furnaces, further improving energy conversion and utilization efficiency;
- Extend equipment life: the water cooling design make the whole system achieve good heat dissipation, keep the safety environment of metal metallurgy.
Future prospect
In order to obtain higher energy conversion efficiency and improve the electric energy efficiency, a high input and output power factor. With the development and the application of power electronics, resonant inverters in the induction power supply circuit through the power device to achieve the soft switching, so the induction heating power system will be toward large capacity and higher power, those technologies need to be further solved.
The development trend of induction heating technology is more high-power and large-capacity and high-frequency; Low power consumption, high power factor; Intelligent and digital control; Heating technology no oxidation etc.
Factory operation procedure
1. capacitor cases
1. cooing water tubes-1
1. cooling water tubes-2
2. winding capacitor core-1
2. winding capacitor core-2
2. winding capacitor core-3
3. soldering and assembly
3. solering core
4. Test of intermediates
5. sealing the case
6. Vacuum oil filling process-1
6. Vacuum oil filling process-2
6. Vacuum oil filling process-3
7. leak test
8. Ex-factory test
9. packing and delivery
Frequently Asked Questions
How does an induction heating and melting capacitor work?
It works based on electromagnetic induction and capacitor energy storage. When connected to a high-frequency AC power supply, it generates a high-frequency electric field inside, creating an induced current (vortex) on the metal surface to convert electrical energy into thermal energy for rapid heating.
What are the materials used in the construction of these capacitors?
The capacitor uses PP film as the dielectric material, biodegradable and non-PCB liquid for insulation, and is housed in an aluminum case.
What are the cooling water temperature requirements for safe operation?
For water-cooled configurations, the inlet cooling water temperature must be lower than 30℃, and the outlet cooling water temperature should be kept lower than 45℃.
Can these induction heating capacitors be installed horizontally?
The standard installation is indoor and vertical. If you require horizontal installation, please advise in advance as a special design is required for the horizontal position.
What are the main application advantages of using these capacitors?
They offer a fast heating rate, high energy efficiency with minimal energy loss, high reliability for continuous operations, environmental protection with no exhaust gas, optimized system matching, and extended equipment life due to efficient water-cooled heat dissipation.
What are the future development trends for induction heating technology?
The technology is moving towards larger capacity, higher power, higher frequency, lower power consumption, higher power factor, digital and intelligent control systems, and oxidation-free heating technologies.