Induction heating coil
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorMitsuyuki Kiuchi
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Abstract
An improved flat induction heating coil for a cooking apparatus of the type in which an electrically conductive cooking utensil is heated according to the principle of electromagnetic induction. To provide a substantially uniform magnetic flux density distribution in the induction coil constituting a part of the cooking apparatus and, hence, a uniform temperature distribution across the bottom of the cooking utensil, a refractory insulating material is wound adjacent inner turns of the coil to provide a comparatively larger winding pitch for said inner turns than for outer turns. This arrangement makes for a flattened temperature profile and eliminates an uneven cooking of food.
Claims4
A flat spiral wound induction heating coil of inner and outer pitch for a cooking appliance of the induction heating type which comprises a coil winding of litz wire having inner and outer turns, the outer turns being directly adjacent with each other and having a substantially uniform pitch, and a strip of electrically insulating material which is wound along between and adjacent to only said inner turns of said coil winding of litz wire so as to provide a comparatively larger, substantially uniform winding pitch for said inner turns of litz wire than the pitch of said outer turns thereof and thereby providing a uniform temperature distribution across the bottom of the cooking appliance.
Dependencies are inferred from the claim text.