Induction Stirring Coil for Vacuum Induction Degassing

Product Specifications

Technical details and manufacturing context for Induction Stirring Coil

Definition

The Induction Stirring Coil is a critical component of vacuum induction degassing (VID) units used in metal refining processes. This specialized coil generates high-frequency alternating magnetic fields that penetrate the vacuum chamber and induce eddy currents in the molten metal bath below. These currents create electromagnetic forces that stir the molten metal without physical contact, promoting homogenization, temperature uniformity, and efficient removal of dissolved gases and impurities during the degassing process. The coil is typically constructed from high-purity copper tubing with high-temperature electrical insulation and integrated cooling water channels to manage thermal loads. It operates on electromagnetic induction principles: when alternating current passes through the coil, it generates a time-varying magnetic field that penetrates the vacuum chamber walls and induces circulating eddy currents in the conductive molten metal. The interaction between these eddy currents and the magnetic field creates Lorentz forces that drive the molten metal in a controlled stirring pattern, typically creating a double-loop circulation that brings material from the bottom to the surface. Key parameters include rated power (100–500 kW), supply voltage (380–690 V AC, three-phase, 50/60 Hz, per IEC 60038), frequency (0.5–5 Hz, lower for deeper penetration), coil inner diameter (800–2000 mm), coil height (500–1500 mm), number of turns (10–30), cooling water flow rate (20–80 L/min), cooling water inlet temperature (5–35 °C), maximum coil temperature (80–120 °C), insulation class (F–H per IEC 60085), ingress protection (IP54–IP65 per IEC 60529), and weight (500–3000 kg). These values are reference ranges and must be confirmed for the specific model and application. The coil is designed to match ladle or vessel dimensions and must be verified for compatibility. Always consult the legal manufacturer or supplier for model-specific values and standards.

Working Principle

The coil operates on electromagnetic induction. Alternating current through the coil generates a time-varying magnetic field that penetrates the vacuum chamber walls and induces eddy currents in the conductive molten metal. The interaction between these eddy currents and the magnetic field creates Lorentz forces that drive the molten metal in a controlled stirring pattern, typically creating a double-loop circulation that brings material from the bottom to the surface.

Common Materials

High-purity copper tubing, High-temperature electrical insulation, Cooling water channels

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Power	100–500 kW	Depends on melt size and stirring intensity
Supply Voltage	380–690 V AC	Three-phase, 50/60 HzIEC 60038
Frequency	0.5–5 Hz	Lower frequency for deeper penetration
Coil Inner Diameter	800–2000 mm	Must match ladle or vessel dimensions
Coil Height	500–1500 mm	Determines stirring zone length
Number of Turns	10–30	Affects inductance and magnetic field strength
Cooling Water Flow Rate	20–80 L/min	Required to maintain coil temperature
Cooling Water Inlet Temperature	5–35 °C	Higher temperatures reduce cooling efficiency
Maximum Coil Temperature	80–120 °C	Exceeding may damage insulation
Insulation Class	F–H	Class H allows higher temperature riseIEC 60085
Ingress Protection	IP54–IP65	Protects against dust and water jetsIEC 60529
Weight	500–3000 kg	Depends on size and copper mass

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Copper Conductor Tubing Part
Carries high-frequency alternating current and provides cooling water passage

Material: High-purity oxygen-free copper
Electrical Insulation Layers Part
Prevents electrical breakdown between coil turns and to ground

Material: High-temperature mica or ceramic-based insulation
Cooling Water Connections Part
Inlet and outlet ports for closed-loop cooling system

Material: Stainless steel or brass fittings
Structural Support Frame Part
Maintains coil geometry and provides mounting points

Material: Stainless steel or high-temperature composite

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Frequently Asked Questions

What is the primary function of an induction stirring coil in a VID unit?

It generates alternating magnetic fields that induce eddy currents in molten metal, creating electromagnetic forces that stir the metal without physical contact. This promotes homogenization, temperature uniformity, and removal of dissolved gases and impurities.

What are the typical power and voltage requirements?

Reference ranges are 100–500 kW rated power and 380–690 V AC supply voltage (three-phase, 50/60 Hz) per IEC 60038. Exact values depend on melt size and stirring intensity and must be confirmed with the manufacturer.

How does the coil handle heat generated during operation?

The coil includes cooling water channels. Typical cooling water flow rate is 20–80 L/min with inlet temperature 5–35 °C. Maximum coil temperature is 80–120 °C; exceeding this may damage insulation.

What standards apply to this component?

Relevant standards include IEC 60038 for voltage, IEC 60085 for insulation class (F–H), and IEC 60529 for ingress protection (IP54–IP65). These are verification references; compliance must be confirmed with the supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Vacuum to 1 atm (operating pressure range)
other spec:	Power input: 50-500 kW, Frequency: 50-1000 Hz, Cooling water flow: 10-50 L/min
temperature:	Up to 1800°C (molten metal temperature)

Induction Stirring Coil

Product Specifications

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Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

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