Dynamic Analysis and Mechanical Structure Improvement of Submersible Rotor

Abstract

In order to enhance interference immunity and reduce the breakage of rotating shafts (rotors) which happens frequently especially in submersible permanent magnet synchronous motor (PMSM) applications, first a typical rotor structure is established serving as the comparative object, and then two improved schemes with optimal mechanical structure are proposed. Rotor strength, rotor stiffness, and the influence of unilateral magnetic pull on the rotor deflection are calculated analytically. The modal simulation, stress field simulation, and unilateral magnetic pull simulation are analyzed using finite element method (FEM). Position deviation and bending deformation of the rotor caused by the unilateral magnetic pulling force is taken into account to improve the simulation accuracy. The simulation results illustrate that the submersible rotor improved by the proposed schemes presents more excellent stiffness and strength performance compared with the traditional scheme, which indicates that the proposed schemes have important reference values for the structural design of submersible rotor.

Stress Analysis of a Rectangular Shaft Carrying a Rotor System Due to Eccentricity

“…Using uniformly distributed load of 5 N, tensile stresses and deflections were obtained for all cases. Many types of stresses and deflections in all directions for this shaft are obtained and discussed as following: In figures (3,4,5,6) when the eccentricity (e = 0.1x10 -3 ) the value of Von Mises stress (σ von ) begins from (33) Mpa at (N= 1000 R.P.M) and reach to (36.5) Mpa at (N= 4400 R.P.M) but (under the same conditions) in the case of the eccentricity (e = 0.3x10 -3 ) will be (43) Mpa at (N= 1000 R.P.M) and reach to (161) Mpa at (N= 4400 R.P.M). In figures (7,8,9,01), when the eccentricity (e = 0.1x10 -3 ) the value of (σ 3 ) stress begin from (-39.4) Mpa at (N= 1000 R.P.M) and reach to (-41.7) Pa at (N= 4400 R.P.M) but (under the same conditions) in the case the eccentricity (e = 0.3x10 -3 ) will be (-51.1) Mpa at (N= 1000 R.P.M) and reach to (-203) Mpa at (N= 4400 R.P.M).…”

“…Also, they found a small effect of eccentricity distance on the stability of the rotor. Xiaohe Ran et ai [5] are enhance the shaft-rotor system by using two improvement schemes which are rotor stiffness, rotor strength as well as the effect of uni-lateral magnetic extension on the deflected rotor. They used finite element method (ANSYS) to modal, investigate stress and extended unilateral magnetic.…”

Electric Field Evaluation Using the Finite Element Method and Proxy Models for the Design of Stator Slots in a Permanent Magnet Synchronous Motor

“…The paper showed that saturation effects, flow on the d and q axes, and other factors must be considered in analyses using the FEM to obtain accurate evaluated motor parameters. FEM analysis can also be used to improve the assessment of interference to reduce the breakdown of rotary axes in PMSM, by evaluating the stress to which the engine will be subjected through simulation [19]. In [20], the variation in the slots' design through an optimization process was also presented using the FEM for the design of a motorcycle engine equivalent.…”

Mass Optimization Method of a Surface-Mounted Permanent Magnet Synchronous Motor Based on a Lightweight Structure

“…A mechanical design of a PM motor with inside-out configuration for future 737 class hybrid-electric aircrafts was carried in [12]. To reduce the breakage of the rotating shaft for submersible PMSM, two improved schemes with optimal mechanical structures were proposed and verified in [13].…”