Method for calculating stress of motor rotor, rotor optimization design method and related equipment

Abstract

This invention discloses a method for calculating motor rotor stress, a rotor optimization design method, and related equipment, belonging to the field of rotor stress analysis. The method includes: calculating the initial deformation u0 of the rotor sheath and the deformation u of the rotor sheath due to rotation based on the rotor's geometric parameters and rotational speed. ω And the deformation u of the middle connecting rib due to stress s The deformation of the middle connecting rib is calculated as u. rib =u s -u0+u ω According to the calculation, the stress σ on the middle connecting bar is... rib and according to σ′ rib =k1σ rib Compensate with +k2 to obtain the final calculated result σ′ of the stress on the middle connecting bar. rib E Fe L represents the Young's modulus of the rotor core. rib The axial length of the central connecting rib is represented by k1 and k2, which are compensation factors. This invention provides a rotor stress calculation method with high computational efficiency and accuracy for built-in permanent magnet motors with a central connecting rib but no magnetic bridge.

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