Generator rotor strength calculation method capable of achieving parametric modeling

Abstract

The invention relates to a generator rotor strength calculation method capable of achieving parametric modeling. The generator rotor strength calculation method comprises the step of calculating and obtaining pressure applied to the bottom surfaces of slot wedges by components in slots under the action of centrifugal force through a classic formula. The generator rotor strength calculation method is characterized in that parameters are input; according to the parameters input in the step 2, rotor slot types, contact units between a rotor and the slot wedges, weak springs between the rotor and the slot wedges and centrifugal force of the components in the slots borne by the bottom of each slot wedge are automatically identified through a parametric rotor strength calculation program, geometric models of a rotor body and the slot wedges are generated, grids are drawn for the rotor body, the slot wedges and damping slot wedges, and various load steps are set for solving. The generator rotor strength calculation method overcomes the defects in the prior art, strength calculation of various shapes of rotor slots and the slot wedges can be completed, simple operation is achieved, standardization of the calculation method and procedures is achieved, and result deviations occurring when different research personnel conduct calculation are avoided; meanwhile, a calculation period is shortened greatly, and design cost is reduced to a certain degree.

Description

technical field [0001] The invention relates to a finite element calculation method for the mechanical strength of a large generator rotor body and a slot wedge, which is suitable for generators and large motors, and belongs to the technical field of generator body strength calculation and improvement. Background technique [0002] The calculation of the strength of the generator rotor body is an important part of the overall design of the generator. It involves the average stress and the maximum stress at the key positions of the rotor teeth and slot wedges. It is mainly used to calculate and check the mechanical strength of the generator rotor and slot wedges. , Optimizing and improving the shape and structural size of the rotor embedding groove and slot wedge, so as to ensure the normal operation of the generator within the designed service life. [0003] There are two main calculation methods in the past: the first one is to use the plane strain solution model based on t...

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Problems solved by technology

[0003] There are two main calculation methods in the past: the first one is to use the plane strain solution model based on the stress and deformation of the rotating body under the action of centrifugal force and uniform pressure to deduce and calculate the classical mechanical formula, that is, considering the rotor teeth, slots, etc. Under the action of the centrifugal force of components and slot wedges, the average tensile stress, maximum tail stress, average shear stress, and average contact pressure at key positions of the rotor teeth and slot wedges are calculated. Due to the excessive simplification of the model during calculation, the calculated values ​​are relatively low. Conservative, and the concentrated stress at the fillet cannot be calculated; the second is to use finite element calculations, that is, for a specific type of rotor, a half-tooth and half-slot model of the rotor or a 1 / 4 model of the rotor is established for calculation. It can accurately calculate the stress at key fillet corners such as the tooth neck, the bottom of the ruled groove, and the bottom of the auxiliary groove, but every time a groove type or even a structural size is changed, it takes a lot of time to remodel and draw the grid, which is easy Operation errors, and different R&D personnel have different modeling and grid processing methods during calculation, which will cause certain deviations in the calculation results

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