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This paper is an extension and continuation of the previous authors' work, where a practical solution for a novel single phase PM BLDC motor model has been developed, utilising an asymmetrical stator pole design. An accurate 2D finite element simulation was employed to numerically analyse the magnetic field distribution inside the motor. The results are used to prove the selected stator/rotor arc...
This paper investigates a newly designed flux-switching permanent magnet machine with 12 stator poles and 14 rotor poles for downhole application where the ambient temperature is around 150°C. This machine having an outer diameter of 100 mm and an active axial length of 200 mm can provide ~2.7 kW with an output torque up to 25 Nm, an efficiency of ~88% and power factor of 0.87. The maximum temperature...
The paper presents a detailed analysis and comparison of two types of non-axial windings used for slotless permanent magnet (PM) motors: zigzag and rhombic ones. The motor mathematical model is verified by 3D FEM software. Finally, the motor prototype is presented.
Coupled circuit-field solutions provide a powerful tool to simulate the detailed behavior of electrical machines and other magnetic devices operating as part of a larger system. The coupling of both domains can be made inside a single analysis tool, or it may be attempted by combining two separate-domain programs, thus taking advantage of the individual strengths of existing numerical codes. In this...
This paper presents a design and experimental study of a rare-earth less motor for hybrid vehicles. Claw pole motor was chosen for base topology and additional ferrite magnets are installed into the rotor poles in order to increase high torque capability and to reduce low field excitation loss. Some design criteria, test results and comparison with Nd-Fe-B magnet motor are shown.
This paper presents an investigation of transient phenomena of a Salient Poles Synchronous Machine connected to an infinite bus, focusing on the currents of the damper bars, the electromagnetic torque oscillation and the stator currents, during two kinds of short-circuits: (a) an inter-turn in the stator of the synchronous machine between two conductors of different phases and (b) between two conductors...
The macro air-gap element and its torque formulation were proposed earlier by Abdel-Razek et al. for modeling electrical machines with an annular air-gap. This paper extends the existing formulation for force calculation in the finite element model incorporating a two-dimensional Cartesian macro air-gap element. The new formulation can be useful for force or torque calculation of some special electric...
This document contains possibilities of additional asynchronous torque development due to the high harmonics and their general derivation. Also, there is calculated a pulsating torque of 3-phase induction machine with power 1.1kW from electromagnetic field and example of additional asynchronous torque calculation. Whole analysis is done by finite element method in ANSYS. The torque is calculated via...
This paper experimentally verifies the performance of a switched reluctance (SR) motor made of permendur. The permendur, which is an alloy created by mixing 49% cobalt with iron, has extremely high saturation flux density and very low core loss. Two types of 12/8-pole SR motors which have the same dimensions but different core material; one is conventional non-oriented Si steel and the other is permendur,...
In a direct-drive high-power A / C-axis bi-rotary milling head,torque is transferred by two parallel connected rotary direct drive motors in C-axis, therefore, the length of C axis is inevitable large, moreover, the transmission components of it are bearing high torque. Through analyzing the twist stiffness of the transmission components in C-axis by the finite element method, the result that the...
Aimed at structure retrofit of sprocket shaft, combining with the practical working conditions, theoretical calculation, finite element method (FEM) Analysis and model test are applied in research. The results show, numerical value of traditional mechanical algorithm is relative small, FEM can express the influence of actual structure, and results are more reliable. FEM Analysis represents stress...
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 presents a novel structure of double salient interior permanent magnet machine (DSIPM machine) based on mutually coupled switched reluctance machine (MCSRM). Due to its salient rotor structure, the DSIPM machine can have less magnetic and iron materials as well as higher dynamic response than conventional IPM machines. The comparison of electromagnetic performances in terms of self and...
A novel control method is proposed in this paper, namely six-phase motor trapezoidal wave phase current control. By using the trapezoidal phase current waveform, the stator winding is separated into the field winding and the torque winding. The function which is about the field and torque control in directed and separated mode can be realized without the complex Park transformation. The airgap field...
A novel position and speed estimator for single phase permanent magnet brushless d.c. (PMBLDC) motor drives, based on flux integration and prior knowledge of ΨPM (θ) is proposed here and an adequate correction algorithm is adopted in order to increase the robustness to noise and to reduce the sensitivity to accuracy of flux linkage estimation. A speed and current close loop control is employed based...
Based on the thermo-elastic instability (TEI) theory and direct thermal-structural coupling method, the temperature increment and deformation of disk brake during an emergency braking process are analyzed. The simulation results indicate that the disc brake, before running-in, takes 3.35sec to decelerate from the initial speed of 100km/h to 0km/h, with 207°C maximum temperature increment, 8.29m/s2...
Based on parameterized modeling and meshing of ANSYS on gear, finite element modeling was analyzed through applying the torque to the gear, and tooth trace was designed by quadratic curve. The results indicate that gear of tooth modification may enhance gear's contact intensity.
The “Tabletop” and “umbrella” style platforms of 3DOF air-bearing spacecraft simulator were compared. According to the theory on kineto-elastodynamic analysis and on the spacecraft attitude kinetics, the formulary for the platform structure mass-center displacement is deduced. It is calculated that the unbalance torque resulted from deforming of the platform of air-bearing simulator acted on gravity...
The magnetic fields of permanent magnet brushless DC motors surface-mounted with parallel magnetization magnets and radial magnetization magnets were computed with finite element method. The finite element computation results show that the air-gap flux density of brushless DC motor with radial magnetization magnets is increased by 25% than that of brushless DC motor with parallel magnetization magnets...
This paper presents the design of a flexure-based planar force/torque sensor. The sensor is built as a monolithic structure with flexure components and strain gauges. The strains on the flexure components caused by loads will be sensed by the strain gauges and will be used to calculate the appropriate loads. This paper also presented the studies on the sensibility and the appropriate positions for...
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