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Patent literature first mentions linear induction machines in 1890, only two years after the discovery of the rotary induction principle. Basically the concept of the linear device consists in imagining a rotary machine to be cut along a radial plane and 'unrolled' so that the primary member then consists of a single row of coils in slots in a laminated steel core. The differences between rotary and linear motors are outlined and reasons for the slow application of linear motors are explained. Principal developments in linear machines since the 1950s are described.
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E.R. Laithwaite (1969) studied this question.
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