Research On Structural Design Of Induction Generator In Wind Power System

With the increasing depletion of traditional fossil energy, human demand for renewable energy continues to grow. Wind energy, which is a green energy, has large reserve, and is convenient to use, has been vigorously exploited and utilized. And it can be used in a relatively convenient way, namely, wind power generation. Induction generators, as the core component of wind power generation system, are widely used now due to its advanced technology, low cost and other advantages.This paper introduces the main components of wind power generation system and the working principle of induction generators. On the basis of satisfying technical parameters, by designing and optimizing the structure of squirrel cages induction generators of MW class, the reliability of motors can be improved, and the cost can be further reduced.Outer diameter and length of iron core, and other major dimensions of motors can be calculated in accordance with general specification and basic technical requirements stipulated in design specification of motors. This paper describes the method of calculating the length of air gap of motors and selecting suitable groove profiles and combination of slots for stators and rotors according to formulas, introduces the basic content, principles and methods of structure design of motors, and explains the methods of inserting and connecting wires of stators by giving examples.By taking shaft deflection as an example, this paper provides analysis and calculation of the intensity of motors by using numerical analytic method and finite element method. The numerical analytic method calculates the shaft deflection formed at the pressure of gravity, concentrated stress at shaft extensions, and unilateral magnetic force, while finite element method analyzes shaft deflection forced by gravity and unilateral magnetic force. Of the above two forces, the latter is exerted on the upper side of the shaft in the form of equivalent pressure. It can be seen from results of the paper that shaft deflections calculated by using numerical analytic method and finite element method are almost the same. This paper computes the intensity of engine base using the simulation module of SolidWorks through simulating calculation, including the stress bearing status, displacement, safety factor, etc., and compares those data with allowable values. The results show that the intensity of engine base conforms to requirements of design.This paper also discusses secondary development of SolidWorks in VB programming language so as to save time of structure design of motor and improve efficiency, describes the usages of line drawing, feature extrusion and other functions, and introduces the principles and general steps of secondary development of SolidWorks by taking rotor lamination as the example.