The Analysis of Air Gap Flux Density in Permanent Magnet Brushless Motor with External Rotor

2011 ◽  
Vol 383-390 ◽  
pp. 2666-2671
Author(s):  
Rui Yuan Xu ◽  
Cun Shan Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Density Distribution ◽  
Permanent Magnet ◽  
Flux Density ◽  
Load Condition ◽  
Air Gap ◽  
Brushless Motor ◽  
Flux Density Distribution ◽  
External Rotor

The air gap flux density distribution in different radius of three conditions such as stator iron without slotting, stator iron slotting under no load condition and stator iron slotting under load condition is discussed using the 2-D finite element method. The effect of slotting on the distribution of air gap flux density of permanent magnet brushless motor is also analyzed.

Modal-frequency spectrum of magnetic flux density in air gap of permanent magnet motor

2014 ◽  
Vol 63 (1) ◽  
pp. 29-46
Author(s):  
Pawel Witczak ◽  
Witold Kubiak ◽  
Marcin Lefik ◽  
Jacek Szulakowski
Keyword(s):  
Permanent Magnet ◽  
Flux Density ◽  
Frequency Spectrum ◽  
Air Gap ◽  
Magnetic Flux Density ◽  
Permanent Magnet Motors ◽  
Modal Frequency ◽  
Time Stepping ◽  
Sinusoidal Shape ◽  
Flux Density Distribution

Abstract The classic relationships concerning the harmonic content in the air gap field of three-phase machines are presented in form of series of rotating waves. The same approach is applied to modeling of permanent magnet motors with fractional phase windings. All main reasons of non-sinusoidal shape of flux density distribution, namely, magnets’ shape and their placement, slotting, magnetic saturation and eccentricity are also related to their counterparts in modal-frequency spectrum. The Fourier 2D spectrum of time-stepping finite element solution is confronted with results of measurements, with special attention paid to accuracy of both methods

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.  

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