scholarly journals Field Analysis, Distribution and Performance of Sleeve Rotor Induction Motor Taking the Sleeve Rings into Consideration

2020 ◽  
Vol 9 (1) ◽  
pp. 838-842
Keyword(s):  
Induction Motor ◽  
Flux Density ◽  
Air Gap ◽  
Field Analysis ◽  
Force Density ◽  
Field Equations ◽  
Axial Distribution ◽  
Design Data ◽  
And Performance ◽  
Overload Capacity

In this paper, the field analysis of the sleeve-rotor induction motor taking the rings effect into consideration is carried out using the Maxwell’s field equations. A model in cylindrical coordinates is used to establish the rotor-rings and to solve the air gap magnetic field. The flux density is assumed to be constant through the very small air gap length while the skin effect through the axial rotor length is considered. The axial distribution of the air gap flux density, the sleeve current density components and the force density are obtained. The motor performance is carried out taking into account the effects of the sleeve rings performance characteristics. The effects of design data on the starting torque and the overload capacity of the motor are also considered.

scholarly journals Economic design of sleeve rotor induction motor using rotor ends

2022 ◽  
Vol 12 (2) ◽  
pp. 1233
Author(s):  
Omar S. Daif ◽  
M. Helmy Abd El-Raouf ◽  
Mohamed Adel Esmaeel ◽  
Abd Elsamie B. Kotb
Keyword(s):  
Induction Motor ◽  
Flux Density ◽  
Current Density ◽  
Axial Direction ◽  
Air Gap ◽  
Field Analysis ◽  
Force Density ◽  
Motor Speed ◽  
Field Equations ◽  
Equivalent Circuit Parameters

<span>In this paper, the field analysis of the sleeve rotor induction motor (IM) is carried out taking the rotor ends into consideration. Here, the field system equations are derived using the cylindrical model with applying Maxwell's field equations. It is expected that, both starting and maximum torques will increase with taking the rotor ends than that without rotor ends. A simple model is used to establish the geometry of the rotor ends current density and to investigate the air gap flux density. The magnetic flux is assumed to remain radially constant through the very small air gap length between the sleeve and stator surfaces. Variation of the field in the radial direction is ignored and the skin effect in the axial direction is considered. The axial distributions of the air gap flux density, the sleeve current density components and the force density have been determined. The motor performance is carried out taking into account the effects of the rotor ends on the starting and normal operations. The sleeve rotor resistance and leakage reactance have been obtained in terms of the cylindrical geometry of the machine. These equivalent circuit parameters have been calculated and plotted as functions of the motor speed with and without the rotor ends.</span>

scholarly journals Bearing Fault Analysis in Induction Motor Drives Using Finite Element Method

2018 ◽  
Vol 7 (3.6) ◽  
pp. 30 ◽  
Author(s):  
C Vinothraj ◽  
N Praveen Kumar ◽  
T B. Isha
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electromagnetic Field ◽  
Induction Motor ◽  
Flux Density ◽  
Air Gap ◽  
Voltage Source ◽  
Pwm Inverter ◽  
Bearing Fault ◽  
Element Method

Diagnosis of faults in induction motor is an indispensable process in industries to improve the reliability of the machine and reduce the financial loss. Among the various faults occurring in induction motors (IM), bearing fault is the predominant one which covers nearly 60% of faults. In this paper, a study of the electromagnetic field of an induction motor with bearing fault fed from both the mains and a three phase voltage source PWM inverter in open loop is carried out using Finite element method (FEM). Electromagnetic field parameters like flux lines distribution, flux density distribution and radial air gapflux density are analyzed. The presence of bearing fault can be detected from the spatial FFT spectrum of radial air gap flux density. From the FFT spectrum, it is seen that the amplitude of fundamental component of radial air gap flux density decreases and those around 100 mm distance increases with the severity of fault.  

Control for Optimized Air-Gap Magnetic Field of Five-Phase Induction Motor through Dual-Plane Asynchronous Rotation Transformation

2013 ◽  
Vol 347-350 ◽  
pp. 486-490
Author(s):  
Mu Yi Yin ◽  
Ling Zhang ◽  
Peng Zhu ◽  
Fei Guan
Keyword(s):  
Magnetic Field ◽  
Induction Motor ◽  
Flux Density ◽  
Mechanical Load ◽  
Air Gap ◽  
Linear Functions ◽  
Magnetic Flux Density ◽  
Third Harmonic ◽  
The Third ◽  
Air Gap Magnetic Field

This paper presents a control scheme with an optimized air-gap magnetic field for five-phase induction motor, the control objective is to generate a quasi-square magnetic flux density by the control of excitation and torque currents in the two planes. In this paper, the decoupling vector control model of five-phase induction motor in d1-q1-d3-q3 coordinate system is analyzed, and the direct and quadrature current components in the third harmonic plane as non-linear functions of the fundamental are built, which guarantee the air-gap magnetic to be a constant quasi-square waveform irrespective of the mechanical load, and then the third harmonic current injected method for improved air-gap magnetic field is proposed. Finally, the simulations by Matlab/Simulink and experiments are implanted on a 5.5 kW, five-phase concentrated full-pitch windings induction motor. The results indicate that the proposed method can satisfy the requirement of a quasi-square air-gap flux density, and the air-gap magnetic field gets improved.

scholarly journals A Study on a Slotless Brushless DC Motor with Toroidal Winding

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1881
Author(s):  
Ho-Young Lee ◽  
Seung-Young Yoon ◽  
Soon-O Kwon ◽  
Jin-Yeong Shin ◽  
Soo-Hwan Park ◽  
...  
Keyword(s):  
Flux Density ◽  
Analytical Method ◽  
Air Gap ◽  
Element Analysis ◽  
Tooth Structure ◽  
Brushless Dc ◽  
And Performance ◽  
Winding Angle ◽  
Winding Factor ◽  
Motor Structure

In this study we developed a brushless DC (BLDC) slotless motor with toroidal winding. The proposed toroidal winding is a method of winding a coil around a ring-type stator yoke in the circumferential direction. As there is no need for a slot or tooth structure, it can be designed with a slotless motor structure that is advantageous for vibration and noise. The basic principle of operation and motor characteristics of a slotless motor with toroidal winding were explained using an analytical method and finite element analysis (FEA). Further, the air gap flux density, winding factor, and back electromotive force (EMF) for changes in the winding angle and number of coil turns were calculated using the analytical method and compared with the FEA results. Finally, the resistance, back EMF, cogging torque, and performance of the prototype were measured and compared with the FEA results. The results show that the air gap flux density and winding factor were approximately the same with an error of <2%, while the back EMF had an error of ~10% from the analysis result. Thus, the proposed slotless motor provides a basic design for conveniently manufacturing brushless DC (BLDC) slotless motors with toroidal windings.

scholarly journals Electromagnetic Analysis and Performance Investigation of a Flux-Switching Permanent Magnet Machine

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3362 ◽  
Author(s):  
Azeem ◽  
Kim
Keyword(s):  
Permanent Magnet ◽  
Flux Density ◽  
Air Gap ◽  
Stator Core ◽  
Element Analysis ◽  
Optimal Value ◽  
Rotor Poles ◽  
Slot Opening ◽  
And Performance ◽  
Design Factors

This paper aims to present a general and effective analytical approach to calculate the air gap flux density and the back electromotive force (EMF) of a flux-switching permanent magnet (FSPM) machine. The proposed analytical expression of the air gap flux density is based on an improved air gap permeance function considering the geometries of slotted stator core pieces and magnets between stator teeth as well as the salient rotor poles. The back EMF equation is accurately derived using the proposed air gap flux density equation expressed in terms of practical machine dimensions and thus it provides the key design factors as well as details of the back EMF production mechanism. To validate the proposed analytical expressions, they are applied to the case study of a 12-slot 10-pole FSPM machine, and the finite element analysis results confirm the analytical predictions. Besides, for the proposed analytical model, the effects of the machine’s geometries on back EMF characteristics are investigated. The investigation shows that the ratio of rotor slot opening to slot pitch has a significant effect on the back EMF, and its optimal value is suggested. The proposed equations also provide a mean to choose the slot and pole combinations to obtain a higher power density.

MAGNETOSTATIC FIELD ANALYSIS OF DC COMMUTATOR MOTORS WITH GEAR-TEETH ON THE ROTOR

2017 ◽  
Vol 41 (4) ◽  
pp. 555-569
Author(s):  
Guan-Chen Chen ◽  
Hong-Sen Yan
Keyword(s):  
Flux Density ◽  
Magnetic Circuit ◽  
Torque Ripple ◽  
Open Circuit ◽  
Air Gap ◽  
Field Analysis ◽  
Element Analysis ◽  
Magnetostatic Field ◽  
Gear Teeth ◽  
Torque Ripples

This paper presents the open-circuit magnetostatic field analysis of a DC commutator motor by applying 1-D and 2-D equivalent magnetic circuit methods. For the 1-D and 2-D equivalent magnetic circuit method, the average air-gap flux density of a DC commutator motor and magnetic flux in every node are derived respectively, and the validity is verified by the finite-element analysis. The Carter’s coefficient is applied to model the permeance of the slot and gear-teeth space. The differences of the air-gap flux density are 3.21% and 3.06% for 1-D and 2-D methods, respectively. The flux linkages, back-EMF constants, cogging torques, electromagnetic torques, and torque ripples of the two gear profiles with feasible number of teeth integrated on the rotor are analyzed to verify the effects of gear profiles. The result shows that the gear-teeth integrated on the motor act as dummy slots, which reduce the cogging torque and torque ripple by 92.02% and 50.14 %, respectively.

scholarly journals Application of Wedges for the Reduction of the Space and Time-Dependent Harmonic Content in Squirrel-Cage Induction Motors

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Konstantinos N. Gyftakis ◽  
Panagiotis A. Panagiotou ◽  
Joya C. Kappatou
Keyword(s):  
Magnetic Flux ◽  
Induction Motor ◽  
Flux Density ◽  
High Harmonic ◽  
Air Gap ◽  
Time Dependent ◽  
Magnetic Flux Density ◽  
Iron Core ◽  
Harmonic Content ◽  
Electromagnetic Characteristics

The influence of the semimagnetic stator wedges of different sizes on the electromagnetic characteristics and the behavior of the induction motor is investigated. The study will be carried out with both analytical calculations and FEM analysis. The analytical calculations will take into account the stator and rotor slots, as well as the iron core saturation in order to study the spatial and time-dependent harmonic content of the air-gap magnetic flux density and electromagnetic torque. The size of the wedge plays an important role as it determines the tooth tips saturation, the high harmonic content of the air-gap magnetic flux density, and the electromagnetic characteristics of the induction motor.

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