Abrégé

A composite inductive heating assembly capable of providing in various embodiments, one or more of a variable or higher power density, tighter temperature control, reduced power consumption, longer operating life, and lower manufacturing costs, particularly in a compact design. A composite inductive heating assembly includes an inner layer of dielectric material, a multi-turn coil disposed over the inner layer, and an outer self-supporting body of moldable flux concentrator material rendering the inner layer, coil and flux concentrator into a self-supporting assembly. Select embodiments of the composite heating assembly include a nozzle heater and a manifold heater. A method of manufacturing the composite heater in a mold, with application of heat and pressure, is described.

Classes IPC  ?

• H05B 6/02 - Chauffage par induction
• B29C 45/27 - Canaux d'injection

Abrégé

Apparatus and method for inductive heating wherein an internal inductive heating assembly (10) is provided within a bore (12) of a solid article (14). The heating assembly (10) includes an interior coil (16) inductively coupled to a portion of the article adjacent the bore to inductively heat the article. The heating assembly lacks an internal cooling mechanism and the coil thermally coupled to the adjacent article portion for transmission of heat from the coil to the article. A signal is provided to the coil to generate a magnetic flux for inductive heating of the adjacent article portion.

Classes IPC  ?

• H05B 6/38 - Agencements des bobines spécialement conçus en vue d'une adaptation aux espaces creux des pièces à travailler
• H05B 6/02 - Chauffage par induction

Abrégé

Apparatus and method for inductive heating of a material located in a channel, to modify the state of the material between flowable and nonflowable states. An internal inductive heating assembly (10) is disposed in the material in the channel, and a signal is supplied to the assembly to generate a magnetic flux in at least one of the assembly and the material, the magnetic flux generating inductive heating of the assembly and/or the material. In one embodiment, the heating assembly includes an interior coil (20), an exterior sheath (12) inductively coupled to the coil (20), a dielectric material (30) disposed between the coil and sheath, a flux concentrator, and a conductor for supplying a signal to the coil to generate the magnetic flux. The materials and/or Curie temperatures of the coil, sheath and/or flux concentrator may be selected to provide a desired rate of inductive heating of the sheath and/or the material.

Classes IPC  ?

• H05B 6/10 - Appareils de chauffage par induction, autres que des fours, pour des applications spécifiques

Abrégé

Apparatus and method for inductive heating of a material located in a channel. In one embodiment, the heating assembly comprises an interior coil (20), an exterior sheath (12) inductively coupled to the coil (20), a dielectric material (30) disposed between the coil and sheath, and a conductor for supplying a signal to the coil to generate the magnetic flux for inductive heating of the sheath. The heating assembly is disposed in the material in the channel, and the magnetic flux generated by the coil may be also inductively couple to the material in the channel. The material may be heated from a nonflowable to a flowable state, such as heating a metal or polymer plug formed in a melt channel of a molding apparatus.

Classes IPC  ?

• H05B 6/10 - Appareils de chauffage par induction, autres que des fours, pour des applications spécifiques

Abrégé

Method for inductive heating of a material located in a channel, the material having a melting range between a solidus temperature and a liquidus temperature. The method includes providing an internal inductive heating assembly in the material in the channel, and supplying a signal to the assembly to generate a magnetic flux in at least one of the assembly and material. The magnetic flux generates inductive heating of the assembly and/or the material and a physical agitation which lowers the solidus temperature of the material to a reduced solidus temperature.

Classes IPC  ?

• H05B 6/10 - Appareils de chauffage par induction, autres que des fours, pour des applications spécifiques
• F27D 27/00 - Dispositifs agitateurs pour matériaux fondus
• H05B 6/20 - Fours à noyaux sans fin munis uniquement d'une rigole de fusion
• H05B 6/38 - Agencements des bobines spécialement conçus en vue d'une adaptation aux espaces creux des pièces à travailler

Abrégé

Method and apparatus for providing harmonic inductive power, and more particularly for delivering current pulses providing a desired amount of pulse energy in high frequency harmonics to a load circuit for inductive heating of an article. By controlling the shape and/or frequency of such current pulses, the apparatus and method can be used to enhance the rate, intensity and/or power of inductive heating delivered by the heater coil and/or to enhance the lifetime or reduce the cost and complexity of an inductive heating power supply. Of particular significance, the apparatus and method may be used to significantly increase the power inductively delivered to a ferromagnetic or other inductively heated load, without requiring an increase of current in the heater coil. This enables new heating applications, and in some known applications, decreases the energy consumption or cooling requirements and/or increase the lifetime of the heater coil.

Classes IPC  ?

• H05B 6/06 - Commande, p. ex. de la température, de la puissance