Over-phase control of inverter multiphase AC linear drives

The over-phase control method of inverter multiphase (i.e. having number of phases more than four) AC linear drives is developed by the authors of this paper. Its application allows to improve considerably a number of the drive technical-and-economic characteristics (speed of response, reliability, mass-and-overall dimensions, etc.). This control method can be used not only in the field of electrical AC drives, but also in the systems for electromagnetic stirring of molten metals. In these systems the application of one of versions of the over-phase-control for multiphase inverter-fed linear stators allows to increase the intensity of electromagnetic stirring of molten metals by providing with continuous change of the quantity, space location, and configuration of the vortex areas in the metal mass during the process of the above-mentioned stirring.

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► The increase of the drive phase number allows to use non-traditional control methods.
► The linear drives under the over-phase control have improved characteristics.
► The use of the over-phase control method expands the linear drive control potentials.
► The over-phase control method can be used in metallurgy.