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Abstract

Permanent magnet modules for a permanent magnet rotor are presented. Each permanent magnet module comprises a base-plate and a permanent magnet element attached to the base-plate. The base-plate comprises a bottom section and an upper section between the bottom section and the permanent magnet element. The permanent magnet modules constitute subsets so that permanent magnet modules of different subsets differ from each other by positions of the upper sections of the base-plates with respect to the bottom sections of the base-plates so that the permanent magnet elements of the permanent magnet modules of the different subsets are axially successive and circumferentially shifted when the bottom sections of these permanent magnet modules are axially successive and circumferentially aligned. Thus, the permanent magnet elements of the permanent magnet modules can be arranged into, for example, skewed rows on a surface of the rotor.

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First Claim