Air-Gap and Yoke Flux Density Optimization for Multiphase Induction Motor Based on Novel Harmonic Current Injection Method

2017 ◽  
Vol 53 (3) ◽  
pp. 2140-2148 ◽  
Author(s):  
Wubin Kong ◽  
Ronghai Qu ◽  
Min Kang ◽  
Jin Huang ◽  
Libing Jing
Keyword(s):  
Induction Motor ◽  
Flux Density ◽  
Air Gap ◽  
Current Injection ◽  
Harmonic Current ◽  
Injection Method

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.

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