| 摘要 |
A heating unit in the form of a flat hotplate or boxlike oven in which heat is generated by hysteresis. A ferromagnetic core in the form of a flat panel or three-dimensional container is wound with a coil of electrically conductive material fitted with means for connection to a source of alternating current. The coil may be wound around a three-dimensional core or wound as a flat spiral on one surface of the core. The heating unit is operated by alternate magnetization and demagnetization of the ferromagnetic core to generate heat by hysteresis. One example of use of such a hysteresis heating unit is a portable oven for use in delivery of hot food and adapted for operation from the alternator of a mobile vehicle.
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