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The modal analysis plays an important role in analyzing the vibration and noise of the motors. The models of the stator which are based on the interior permanent magnet synchronous motors (IPMSM) by the 3D finite element software are analyzed. Firstly, it is significant to simplify the stator rind by considering the different components. Then the relationships of the different parameters of the stator...
Line-start permanent magnet synchronous motor with composite rotor is a new type of permanent magnet synchronous motor, which uses eddy currents induced in solid rotor and copper bars to achieve self- starting capability. In order to research the demagnetization of permanent magnets under three-phase short circuit and out-of-step fault, the finite element model considering saturation, eddy currents...
The critical speed of the rotor can be calculated accurately by the transfer matrix method and the finite element method. Since the mass of the shaft section is neglected by the transfer matrix method, the calculation result is slightly larger. By establishing the 3D finite element model of the rotor system, the critical speed and mode of the rotor are analyzed. The results show that the bearing support...
Modal analysis is an important step which studies the vibration characteristics of the motors. The passage analyzes the models of the stator by the 3D finite element software called Workbench, which are based on the interior permanent magnet (IPM) synchronous motor which has 6 pole- pairs and 36 slots structure. Meanwhile, the influence of the yoke thickness, tooth depth, tooth width, the stator coils,...
Because of the increasing pressure for improved the efficiency single-phase motor, a novel single-phase induction motor with three winding in series and two capacitors has been provided to be capable of high efficiency demand. This paper introduces the basic structure and operational principle of the new type motor. A voltage source driving complex finite element model for the novel high efficiency...
Considering the characters of high permeability, high resistivity, low loss and low cost for soft magnetic ferrite in high-frequency alternating magnetic field, this paper proposes a novel high speed permanent-magnet motor based on soft magnetic ferrite. Soft magnetic ferrite ring is used for stator core, rare earth permanent magnet ring serves as the rotor poles, and the slotless configuration with...
Induction motor faults including mechanical and electrical faults are reviewed. The fault diagnosis methods are summarized. To analyze the influence of stator current, torque, speed and rotor current on faulted bars, a time-stepping transient finite element (FE) model of induction motor with bars faulted is created in this paper. With wavelet package analysis method and FFT method, the simulation...
In order to reduce the cogging torque, many methods have been advised and studied in permanent magnet(PM) motor. In this paper, the methods of pole arc coefficient of PM, armature teeth notching, PM shifting and different pole arc coefficient combination are studied and improved based on the analytical expression of cogging torque derived in this paper, and the methods to decide the design parameters...
Based on the analytical formulation for cogging torque derived in this paper, the effects of stator teeth notching on cogging torque are studied. When the method of teeth notching is adopted, the most important is to decide how many notches are needed. When k notches are adopted on one stator tooth, only Fourier coefficients Gn(n is the multiple of k+1) are not zero, and the value of these Gn increases...
It is found that if the slot number per pole is not an integer, new lower harmonics of cogging torque may be introduced when permanent magnet (PM) shifting is adopted. To reduce cogging torque, both the original and newly introduced lower harmonics of cogging torque should be reduced. In this paper, the effect of PM shifting on Bnz(B nz is the Fourier coefficient of the square of magnetic flux density...
In this paper, the method with different pole arc combination was adopted to reduce the cogging torque in PMDC motors. To minimize the cogging torque, a global optimization algorithm (zooming algorithm) and the finite element method (FEM) are combined to find the best pole arc combination. The Fourier coefficient of the square of magnetic flux density is analyzed to determine the feasible region from...
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