大型充水式潜水电机定子端部绕组电磁振动研究

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Abstract Stator windings of large water filling submersible motor suffer from electromagnetic force during operation, which causes the stator winding insulation abrasion, fatigue, degradation, or even leads to an accident. Electromagnetic vibration of stator end winding of 2 800kW water filling submersible motor is analyzed. Firstly, End winding equivalent physical model is proposed. The fundamental wave current density expression is presented by Fourier series and the equivalent air gap rotary current is substituted for air-gap magnetic potential difference of end magnetic field. Secondly, three-dimensional finite element method is used for the establishment of a magnetic field mathematical model. Then the analytical expression of the static component and dynamic component of the electromagnetic force density is deduced, which shows the distribution of electromagnetic force of the end windings. Finally, the natural frequency of end winding and the amplitude of forced vibration are obtained by numerical calculation. The result can provide certain help to solve practical problems in engineering, and can provide reference for end winding structure optimization design.

Key words： Water filling submersible motor end magnetic field electromagnetic vibration finite element method natural frequency

Received: 07 February 2012 Published: 26 March 2014

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TM301

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