An electric-machine–magnetic-reducer combination set

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An electric-machine–reducer combination set (CEMR) with a permanent-magnet internal rotor is considered. The functional characteristics of the hybrid device are analyzed. A stator winding powered by a static-frequency converter enables combination of an electromechanical converter that functions as a motor or generator with a twin-rotor magnetic reducer with a continuously variable reduction ratio. The CEMR comprises a stator with a multipolar three-phase winding; an outer rotor with laminated prismatic ferromagnetic rods, number of which z1 is close to number of the ports p1 of the stator winding; and an internal magnetoelectric rotor with number of ports p2 equal to the difference z1–p1. The magnetic field of the stator with number of the ports p1 arrives at one side of the internal ferromagnetic squirrel-cage rotor. At the output on the other side of this rotor, we have the fundamental harmonic with a small number of ports equal to the difference z1–p1. This magnetic field with a small number of poles interacts with the magnets of the internal rotor, which has the same number of the ports. The electromagnetic torques of the CEMR are generated in a way similar to that in the classical synchronous electric machine; consequently, these moments have a definite restrictive maximum. The CEMR may find application in industries such as machine-tool construction, robotics, transport, defense technology, wind-power engineering, etc.