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The paper proposes an experimental methodology for measurement of forces acting on the rotor under special operational conditions. The influence of static eccentricity with different load applied on the rotor is investigated. The paper also describes all necessary motor construction modifications and the procedure of preliminary measuring system calibration.
Rotor is one of the core component in flux switching machine (FSM) that wield mechanical stress. It is very important to identify the maximum tensile strength of the rotor. Beyond the maximum tensile strength, the rotor will deform or crack. In the research, stress analysis for the tensile strength is measured through principal stress. The stress analysis is conducted to analyze the principal stress...
It cannot reflect the real situation for analysis of flexible coupling-rotor system if the flexible coupling is viewed as shaft or directly ignored. After carefully analyzing the responses in different speed and different unbalance displacements considering the threaded coupling, the accurate threaded coupling-rotor system is established using finite element method. Meanwhile, the threaded coupling-rotor...
The adoption of renewable energy based systems for electricity generation, leaving aside fossil based energy systems is of paramount importance to humanity. The purpose of this paper is the design of a small wind rotor that meets the electric power requirement of a small house in Guildford, UK. The conceptual design developed comes from the evaluation of the existing science and technology in terms...
The gap between the rotor and the stator of the external circulation piston pump has an important impact on pump efficiency and operation reLiabiLity. Shaft and rotor are important parts of the external circulation piston pump. The gap value is determined by the shaft flexural deformation. According to the force of the rotor and shaft, the relevant module of the software ANSYS was appLied to give...
With considering the misalignment exciting force of the gear coupling and nonlinear short bearing forces models, the dynamic model of rotor-bearing system under unbalance was set up. The vibration equations of the system were obtained. By the numerical value integral method, the system's nonlinear dynamic characters were investigated under misalignment exciting force of the gear coupling. From the...
In the paper, we analyze and study the status character in detail which a rotor of some rotating mechanism exist in some different fault types and different fault strengths. The research result shows that a fault rotor reveals distinct return map images, which the rotor runs in different malfunction status or different malfunction strengths. The research gives an effective method to explore fault...
This paper presents the design and verification of a model based nonlinear feedforward controller for vertical and horizontal wind disturbance rejection on autonomous helicopters. The feedforward control is based on a helicopter model that is derived using a number of carefully chosen simplifications to make it suitable for the purpose. The model is inverted for the calculation of rotor collective...
In this paper a high torque double-stator switched reluctance machine (DSSRM) is proposed for electric vehicle propulsion. DSSRM is a novel variable reluctance synchronous machine with two stators and one rotor. The magneto-motive force (mmf) orientation of these coils in DSSRM is such that a short flux path is created. To compare torque per mass of a DSSRM with that of a conventional SRM, finite...
This paper presents an iterative approach to identification of sources and characteristics of rotor and airgap eccentricity and, consequently, unbalanced magnetic pull (UMP) in asynchronous motors. The presented method is based on the number of mathematical modeling techniques, namely: finite elements method (FEM), Lagrangian dynamics and optimal estimation in combination with experimental measurements.
Bearingless drives and magnetic bearings allow the construction of contactless, wearless and lubrication-free rotating systems. Utilizing a permanent magnet excited rotor disc permits the passive stabilization of three degrees of freedom (tilting and axial deflection) by reluctance forces. Hence, using these bearingless slice motors it becomes possible to design very compact magnetically suspended...
A modeling method of parameterized flexible virtual prototype of disc brake was provided by the united application of finite element modeling (FEM) and dynamics analysis method. A virtual prototype of disc brake was created, in which the rotor, backplates and brake pads are flexible parts. A typical dynamics analysis in condition of the fully loaded braking process at the initial velocity of 60 km/h...
When a rotor is simultaneously rotated and translationally moved above an aluminum guideway a traveling time-varying magnetic field is created in the air-gap. This field induces eddy currents in the guideway that can simultaneously create suspension and propulsion or breaking forces. The field and forces created by this moving rotor are modeled using a novel 2D analytic based A-φ method in which the...
Vibration signals are usually used to monitor friction fault between stator and rotor of steam turbine in fossil-fuel power plant indirectly, and the effect is not ideal due to the limitation of vibration meter and heavy mass of rotor. The reason why vibration signals can not monitor friction fault between stator and rotor of steam turbine is analyzed in this paper in theory. A method of monitoring...
The paper purpose is to dignify some aspects regarding the calculus model and technical solutions for surveillance system based on self-supporting gyroplane used to local observations and scientific equipment carrying. The calculus methodology consists in numerical simulation of different gyroplane evolution. The gyroplane model which will be presented has six DOF and autonomous control system. The...
A revolving magnetic mechanism composed of a stator and rotor has been designed to supply contactless actuation force to boring bar for boring of non-circular hole. While the currents in the pole-pairs coils on the stator change, the actuation force would change correspondingly and drive the rotor to take a wanted micro displacement radially. With the linearization of the actuation force, linear relationship...
The magnetic field and the levitation force produced by a rotor with alternating magnetic poles in a hydrostatic bearing, with magnetic fluid, are evaluated numerically. The magnetic liquid is considered as a nonlinear medium. The 3D-FEM program MagNet 5.0 is used for the magnetic field computation and the MatLab program is used for the numerical evaluation of the levitation force that acts on the...
One of the most important drawbacks to the application of the axial flux permanent magnet generator is represented by the relevant mechanical stresses due to the electromagnetic attraction between the stator and the rotor parts, which may arise even in double-side configurations, due to slight air-gap asymmetries. In the paper, a time-effective procedure is presented to analyze the unbalanced condition,...
Rotor is the major work components of vertical shaft impact crusher and tip set extra hard is the most wearing part of it. Based on the analysis of the structure and the working principles of the vertical shaft impact crusher, we set up the three-dimensional model of the rotor in Solid Works. Through the importation of the 3-D model into ADAMS for the dynamic simulation, we simulate the throwing process...
The structure of conical blood pump is introduced, and a new hybrid-type permanent magnetic bearings(PMB) composed of axial and radial PMBs are presented. The hybrid-type PMBs can suspend the rotor in axial and radial directions by the magnetic force. The static magnetic field and the force of PMBs are also computed numerically with the software ANSYS. Study indicates that the radial magnetic suspension...
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