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Optimization design of the rotor can make the system have a good dynamic performance, and it is necessary to make a dynamics analysis for the magnetic suspension rotor on high speed revolution. In this paper, the finite element models of the rotor were established by the finite element analysis software, and initial ten order natural frequencies were calculated by the method of Block Lanczos. The...
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...
This paper analyzes the varying mechanism of the parameters which effect the DTG (Dynamically Tuned Gyroscope) long-term stability in storage conditions. On the basis of the analysis result above, the finite element modeling (FEM) of the DTG is established according to the variation of the rotor material with the temperature. In this model, firstly the rotor centroid shift was computed with temperature...
The paper deals with calculation of start-up characteristics of a Boucherot type squirrel cage winding of an induction machine. The characteristics themselves are calculated in two possible ways - considering and neglecting saturation of machine's steel. The results of both types of calculations are compared and checked through measured start-up test.
A gear-less drive for a wheel chair based on brushless DC motor is presented. The motor has external rotor equipped with neodymium-based permanent magnets and the inner stator is attached to the wheel axle. The performance of the motor is determined using three-dimensional FEM modeling. They are validated by the experimental measurements carried out on the motor prototype.
This paper presents an analytical model for prediction of open circuit eddy current loss in armature windings and permanent magnets of series double excitation synchronous machines. The developed model can either be used in the case of internal or external rotor radial-field machines topologies. First, a 2D exact analytical solution of open circuit magnetic field distribution in an actual geometry...
The characteristics improvements of salient-pole synchronous generators by inserting additional permanent magnets are investigated from both results of finite element analyses and experiments. First, the assist effects of the magnets in a MVA-class generator are analyzed by the finite element method. Next, the characteristics improvements are validated by the experiment of a small prototype generator...
In this paper a simple dynamic circuit-based model for a rotor surface mounted PMSM with inter-turn winding short-circuit fault is presented. Finite element analysis is used for parameter determination and study the PMSM under fault conditions. The Analytical expressions are proposed for determining the fault model parameters. The proposed circuit model and parameter expressions are validated by time...
In this paper an IPMSM (Interior Permanent Magnet Synchronous Motor) rotor configuration optimization is proposed in order to increase the performances in terms of torque, limiting at the same time the rotor leakage flux. The final mixed radial and tangential rotor configuration here proposed and described determines a reduction in PM material quantity of about 25% compared to a tangential IPMSM one...
This paper studies the nonlinear vibration of robotic manipulator with parallelogram hinged mechanism while it motioned in plane. The controllable motor and the hinged mechanism are studied in an integrated manner, and the electromechanical coupling nonlinear dynamic equation of the system is established by finite element method. The relation between the nonlinear vibration of the system and the parameters...
The effect of inverter supply on the eddy-current losses in the laminated core of a synchronous machine is studied. A 2D finite element model including a dynamic model for the eddy currents in the core laminations is applied to predict the machine losses by numerical simulations. A synchronous extruder motor is simulated both with sinusoidal and pulse-width modulated voltage supplies in different...
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...
This paper presents the optimal design method of cage-bars in a single-phase line-start permanent magnet synchronous motor. This method consists of two procedures. First, the basic design of cage-bars is made by analytic method of an induction motor. But, this method cannot consider nonlinear characteristic as magnetic saturation and leakage flux. Therefore, at second step, for considering the nonlinear...
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...
In this paper, the unsteady temperature field of engine eddy current retarder by finite element method is analyzed. Temperature changes and distribution of rotor are analyzed when the vehicle slowly braking as dragging down by the engine and engine eddy current retarder combine effect. And the thermal deformation of the rotor disk is analyzed. Results of the analysis provide a basis for thermal designing...
This paper presents the characteristic analysis on the high speed synchronous generator considering load conditions and power factor. The generator consists of the rotor with the short-circuited field coils connected to armature coils of an exciter and a stator with three-phase winding. To analyze the characteristics considering load conditions, the equivalent circuit method considering the effects...
In this paper, a nonlinear magnetic circuit network model for the analysis of a three-phase 12-stator-slot/10-rotor-pole flux-switching permanent-magnet (FSPM) motor is proposed considering localized saturation effect, which enables the predictions of open-circuit air-gap field distributions, phase flux-linkage, phase back-electro-motive-force (back-EMF) and winding inductances waveforms. Further,...
Successful optimization processes of highly utilized industrial squirrel cage induction machines enforces fast, reliable and accurate design concepts. Therefore, modern numerical finite element calculation procedures, which incorporate moveable rotor parts, non-linear iron saturation effects and realistic geometric properties, have been systematically established and applied to an induction motor...
This paper describes a method to include rotor based harmonics into a fundamental dq simulation model of a redundant dual-star synchronous machine. The model has been derived to add a minimum of additional equations and to allow identification of the required parameters from existing standard machine tests.
In this paper, analytical and finite element method (FEM) approaches to calculation of eddy current losses in conductive non-magnetic sleeves (cans) of synchronous or induction machines are presented. Those losses are especially important in high speed electrical machines as the sleeve losses are a function of the second power of rotational speed. In some applications, non-conductive sleeves, e.g...
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