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Energy-Saving Resonant Capacitor Banks for Induction Heating Furnaces - China Suppliers & Factory Solutions
Here we are introducing one of our special power capacitor banks which used in medium-frequency induction heating furnace. By choosing suitable capacitor banks for your induction heating system may saving up 38% energy and improving induction heating performance up 22%.
So to be a crucial components in medium-frequency induction heating furnace, what is the core function of capacitor banks?
1. Resonant circuit formation
It will connect with the induction coil to create resonance, maximizing current amplitude in the coil for intense magnetic fields and effectively heating.
2. Reactive power compensation
Provide with reactive power to support the inductive coil and whole induction heating power system, so as to improve overall power factor and tune circuit.
What type of induction heating capacitor banks do you need?
There are solid medium, liquid medium for options, air-cooled, water-cooled for options;
Higher frequency Higher Voltage level like 500Hz~300kHz is applicable of liquid medium with internal water-cooling heat dissipation design.
Lower frequency Lower voltage like 50hz~300Hz is applicable of solid/liquid medium with air-cooling design.
But it is not absolute design capacitor in this way. We have many design with frequency up to 10khz water-cooled capacitors, and 5khz air-cooled capacitors as well. The induction heating capacitor bank design mostly depends on the medium-frequency design and structure, such as frequency 500hz~300khz, voltage level, IGBT based or thyristor-based MF power supplies, cooling method, series or parallel resonance circuit, work-piece properties. The work-piece properties will affect a lot for whole induction heating system design.
Here is reference about recommended frequency ranges.
Resonant Capacitors’ Role in Different MF Furnace Types
1. Parallel Resonant Circuits
The capacitor bank is connected in parallel with the induction coil, common in traditional thyristor-based MF power supplies.
2. Series Resonant Circuits
The capacitor bank is connected in series with the load, a more modern, efficient design that allows for higher power factors and easier control.
Required data for customizing a resonant capacitor bank
Voltage level (AC or DC)?
Rating Current?
Frequency?
Output Power/capacitance value: kVar/microfarad ?
Quality Guarantee
- 1) Individual Test Certificate: Each unit must come with a test report of withstand voltage and actual capacitance/voltage/current measurement, leak test etc.
- 2) Connection Compatibility: specify the terminal threads and the cooling water inlet/outlet threads.
- 3) Capacitor manufactured according to IEC 60110-1: (specific to induction furnace capacitors).
- 4) Dielectric: Polypropylene film (PCB-free), All-film structure, good for harsh working environment.
- 5) Case Material: Aluminum alloy (Non-Magnetic).
- 6) Losses (W/kvar): Lowest possible value (e.g., < 0.5 W/kvar).
- 7) Third-Party Inspection available.
Frequently Asked Questions (FAQ)
How can choosing the right capacitor bank improve induction heating efficiency?
By selecting the suitable capacitor banks for your medium-frequency induction heating system, you can save up to 38% energy and improve overall induction heating performance by up to 22%.
What are the primary functions of capacitor banks in medium-frequency furnaces?
Capacitor banks serve two core functions: first, forming a resonant circuit with the induction coil to maximize current amplitude for effective heating; second, providing reactive power compensation to support the induction heating system, improve the overall power factor, and tune the circuit.
What factors determine whether I need an air-cooled or water-cooled capacitor bank?
Generally, higher frequencies and voltage levels (like 500Hz~300kHz) use liquid medium designs with internal water-cooling, while lower frequencies and voltages (like 50Hz~300Hz) use solid/liquid mediums with air-cooling. However, designs are customizable and also depend on power supply type (IGBT or thyristor), circuit type, and work-piece properties.
What is the difference between parallel and series resonant circuits?
In parallel resonant circuits, the capacitor bank is connected in parallel with the induction coil, which is common in traditional thyristor-based MF power supplies. In series resonant circuits, the capacitor bank is connected in series with the load, offering a modern, efficient design with higher power factors and easier control.
What information is required to customize a resonant capacitor bank?
To customize a unit, you need to provide the voltage level (AC or DC), rating current, working frequency, and output power or capacitance value specified in kVar or microfarads.
What quality standards do your induction heating capacitor banks meet?
Our capacitors are manufactured according to the IEC 60110-1 standard. They feature a PCB-free polypropylene film dielectric, non-magnetic aluminum alloy cases, extremely low losses (< 0.5 W/kvar), and come with individual test certificates for voltage, capacitance, and leak tests. Third-party inspection is also available.