Induction cooker with coils arranged evenly along radial direction has a significant deficiency that the heat distribution in the vessel is uneven. The area with high temperature only limits in a ring-zone in the vessel. This ring-zone endures high temperature and often breaks the vessel (pan or wok) into two parts along the ring zone. Furthermore the evenly arranged coils will cause a cold spot in the center area of vessel. This is not often the expectation. Fig. 1 shows the phenomena of fiery ring-zone and cold spot.
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