ELECTROMAGNET MACHINE WITH COMBINED EXCITATION Russian patent published in 2010 - IPC H02K21/12 H02K7/20 H02K19/38 

FIELD: electricity.

SUBSTANCE: invention relates to features of electric machine design, namely to synchronous electric machines excited from permanent magnets, which together with available advantages have certain disadvantages, for instance quite complicated start-up and control characteristics and relative low efficiency factor. In order to preserve positive and reduce negative properties of contactless electric machines (CEM) with permanent magnets and CEM with excitation windings, CEM were developed with combined excitation. Disadvantages of these machines consist in consumption of high reactive power from external grid in process of operation, and also in considerable asymmetry of magnetic circuit. In design of proposed machine, windings of stator and rotor of power set have individual exciters, in which windings of anchors have shape of hollow cylinder and are located between poles of permanent magnets of their inductors and outer magnetic conductors. Electromagnet machine with combined excitation operates from interaction of explicit electromagnet poles of stator and rotor of power set, in the first ones of which polarities change eight times per single turn, and in the second ones - four times. Besides fixed poles of stator and movable ones of rotor change their signs at different time in different phases. Therefore, in front of rotor poles there will always be fixed poles of stator with opposite polarities, and behind them there will be stator poles with identical polarities, accordingly, each electromagnet explicit pole of power set rotor is always exposed to two positive forces directed towards the same side along with rotor rotation. These forces are proportionate to magnetic permeabilities of conductors of electromagnetic poles of stator and rotor of power set in proposed electric machine.

EFFECT: improved start-up and adjustment characteristics and considerable increase of efficiency in contactless electromagnet machines with combined excitation.

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