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STATOR OF LINEAR ELECTRIC SUBMERSIBLE PUMP UNIT AND METHOD FOR ITS OPERATION

10/09/2019

1. A stator of a linear electrical submersible pump unit consisting of a plurality of sections comprising annular support members installed around a hollow guide pipe for a movable part of a linear drive, separating a set of coils forming a winding with a number of magnetic poles p>10, including a spatially combined composition of three-phase interdependent parts (windings) assembled into wye and delta connections, distinct in that structural elements of the stator are made of a material with a relative thermal expansion equal to a thermal expansion of elements of the movable part of the linear drive, while the sections of the stator are performed as a frame structure formed of C-shaped transverse ferromagnetic elements (space plates) with radial protrusions, as well as sectional and intersectional guide elements, installed in an axial direction, designed to provide a constant value of a polar pitch and a precise positioning of the stator elements relatively to each other.
 
 
2. A stator of a linear electrical submersible pump unit consisting of a plurality of sections comprising annular support members installed around a hollow guide pipe for a movable part of a linear drive, separating a set of coils forming a winding with a number of magnetic poles p>10, including a spatially combined composition of three-phase interdependent parts (windings) assembled into wye and delta connections, distinct in that the stator winding is made of the set of coils grouped together and constitutes a part of a magnetic system comprising a number of stator teeth different from a number of magnetic poles of the movable part of the linear electric motor by a two-fold value, while a resultant magnetic field with the number of magnetic poles of the stator is equal to the number of magnetic poles of the moving part, providing that coils in groups are arranged in pairs with an alternation of wye and delta connections, while forming an angle between vectors of a magnetic flux induction of 90 electrical degrees in each pair, and simultaneously coil groups of a same phase are shifted relatively to groups of coils of other phases by 120 electrical degrees.
 
 

3. A method for manufacturing a stator of a linear electric submersible pump unit, comprising

performing the stator of sections, structural elements of which are made of a material with a relative temperature expansion equal to a temperature expansion of elements of a movable part of a linear electric motor; executing the stator sections in a form of a frame structure made of C-shaped transverse ferromagnetic elements (space plates) with radial protrusions, as well as sectional and intersectional guide elements;
arranging between the C-shaped transverse elements a set of coils combined into groups and placed taking into account an alternating current direction within a same group;
forming the coils in the groups in pairs with alternation of wye and delta connections;
forming an angle between vectors of a magnetic flux induction of 90 electrical degrees in each pair;
shifting the coil groups of the same phase relative to the groups of coils of other phases by 120 electrical degrees.
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