| 摘要 |
An electromagnetic device, comprising a first, ring-shaped wound unit consisting of at least first and a second sequentially wound portions of electrically insulated layers of concentrically wound windings, the first portion being made of high permeability material, the second portion being made of a relatively low resistance electrical current-carrying material, the first and second portions being electrically connected to each other and provided with terminal means for connection to a source of power, whereby in operation each of the units constitutes a current conducting as well as an electromagnetic field inducing body for the other of the interlinked units.
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