Submersible asynchronous electric motors with improved performance characteristics

• Main Authors: Evgenii F. Beliaev, Pavel N. Tcylev, Irina N. Shchapova, Vladislav A. Shchapov
• Format: Article
• Language: English
• Published: Perm National Research Polytechnic University 2016-03-01
• Series: Perm Journal of Petroleum and Mining Engineering
• Subjects: submersible asynchronous motor; submersible electrical pump; three-phase stator winding; magnetic field; highest spatial harmonics; performance characteristics
• Online Access: http://vestnik.pstu.ru/get/_res/fs/file.pdf/5486/Submersible+asynchronous+electric+motors+with+improved+performance+characteristicsfile.pdf

Magnetic field in the clearance of submersible asynchronous electric motors of electrical submersible pumps due to little number of stator slots has strongly marked stepped character of distribution. Such magnetic field includes wide range of highest spatial harmonics with significant amplitudes that negatively affect on work and operating parameters of submersible electric motors. The scheme of the two-layer three-phase stator winding is developed. Current in the phase winding of scheme initiate magnetic field in the clearance of motor distribution of which along the inner circle of stator is close to sinusoidal form.The stator winding comprises three single-phase windings formed by an equal number of coils. The coils are connected to each other on the same system, providing a spatial shift of the axes of the windings 120°. Each of the single-phase windings for the double pole pitch of the stator is formed by coils that include groups with the same amount of coils. Each of the groups has different width of input coils and different amount of soils that make coil in comparison with other coil groups. Besides, coils of one of the groups have minimal width and minimal amount of coils. Width and amount of coils every next group is different from previous group. Coils with higher width and amount of coil are placed concentrically to the coils that have minimal width and amount of coils. The parts of slot volume remain free after laying of the single-phase coil windings are used to accommodate the coils of the other two-phase windings made similarly. Asynchronous motors with mentioned stator winding provide increase of electromagnetic torque, decrease in loss and temperature, increase in efficiency, copper rational usage and decrease in vibration and noise. Results of the research are recommended to use by companies of electrical engineering that do mass production of electric machines of alternating current.