Rotating Magnet Induction Furnace for Uniform Billet Heating
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Solution Overview
Problem
Existing magnetic induction furnaces for heating metal billets face inefficiencies due to the need for rotary movement, complex structures, energy waste, and uneven heating, which affect extrusion processes and increase costs.
Innovation Solution
A magnetic induction furnace with a radial magnetic field and stationary billet positioning, using a tubular design with annular permanent magnets and efficient cooling systems to achieve uniform heating and minimize thermal dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If axial movement and rotation of the billet are implemented during heating, then uniform temperature distribution along the billet axis is achieved, but the device complexity increases due to required movement mechanisms
Solution Approach 1:
Instead of moving the billet axially through the furnace to achieve uniform heating, the patent inverts the approach by rotating the magnetic field itself around the stationary billet. The rotor with permanent magnets rotates around the billet's longitudinal axis, creating a rotating magnetic field that uniformly heats the entire billet surface without requiring billet movement or rotation mechanisms.
Solution Approach 2:
The patent replaces the mechanical system of billet movement (translation and rotation) with an electromagnetic system. A rotor containing permanent magnets rotates around the billet, generating a rotating magnetic field that induces eddy currents in the billet surface, achieving uniform heating through electromagnetic induction rather than mechanical motion of the workpiece.
2Temperature
If axial movement of the billet is implemented, then heating uniformity improves, but energy waste increases due to continuous heating and cooling of billet ends
Solution Approach 1:
The patent inverts the conventional approach by keeping the billet stationary and rotating the magnetic field source ( rotor with permanent magnets) around it. This ensures that the entire billet surface is continuously exposed to the rotating magnetic field, achieving uniform heating without the energy waste associated with heating and cooling billet ends during axial movement.
Solution Approach 2:
The rotating magnetic field provides continuous heating action across the entire billet surface simultaneously. As the rotor rotates, the magnetic field continuously sweeps around the billet, ensuring that every point on the billet surface receives uniform heating energy without interruption or cooling cycles, thereby eliminating energy waste.
3Power
If HTSC windings are used in the first magnetic unit, then magnetic field generation efficiency improves, but implementation difficulty increases due to cooling requirements and vacuum cavity needs
Solution Approach 1:
The patent replaces expensive HTSC windings requiring complex cooling and vacuum systems with permanent magnets that operate at ambient conditions. The permanent magnets in the rotor provide sufficient magnetic field strength without requiring cryogenic cooling infrastructure or vacuum cavities, significantly simplifying the device while maintaining effectiveness.
Solution Approach 2:
The permanent magnets in the rotor are self-contained and operate autonomously at ambient temperature and pressure. They generate the required magnetic field without external cooling systems, power supply connections, or vacuum maintenance, making the system self-sufficient and eliminating complex supporting infrastructure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The furnace provides homogeneous heating across the billet's length and cross-section, reduces energy consumption, and enhances production efficiency while maintaining structural simplicity and safety.
Implementation Method 1
by introducing a ferromagnetic or paramagnetic or diamagnetic or a conductor metal body into a magnetic field, in such body there are generated parasitic currents which lead to the heating of the metal body due to the Joule effect
Implementation Method 2
parasitic currents which lead to the heating of the metal body due to the Joule effect
Implementation Method 3
a system adapted to cool said permanent magnets
Data Source
AI summary
A magnetic induction furnace configured to heat solid or tubular metal billets, of various lengths and diameters, made of non-ferrous materials. The furnace includes a fixed body in which there is arranged an electric motor having an annular rotor rotatably disposed in a stator. The annular rotor is joined to a rotor body carrying a plurality of permanent magnets arranged so as to define a hollow magnetic cylinderhaving a cavity configured to contain a non-rotating billet to be heated. The permanent magnets of the rotor body comprise main permanent magnets magnetized in the radial direction with respect to such rotor body and auxiliary permanent magnets magnetized in the axial direction. The permanent magnets generate flux lines of a magnetic field directed inwardly, towards an interior of the cavity configured to contain the billet so as to improve the heating thereof.