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This paper deals with reduction design of eddy current loss in interior permanent magnet synchronous motor (IPMSM) using response surface methodology (RSM). In order to reduce computation time, 2D analysis which based on the eddy current loss is proportional to square of flux density and frequency, is firstly applied. The peak to peak value of flux density and total harmonics distortion of flux density...
Integrated starter and generator (ISG) is working as starter after vehicle idle stopping and generator during vehicle driving. When ISG works as starter to operate engine, ISG produces maximum power at the operating speed 4000 rpm to remove vibration of initial starting of the engine. In that time ISG produces whine noise which can be detected inside a vehicle. There are two methods to reduce the...
This paper deals with a study on the acoustic noise reduction according to the change of the pole angle in interior permanent magnet (IPM) motor with concentrated winding. This research is divided into 3 steps. Firstly, noise sources, such as resonant frequencies of stator and harmonic component of magnetic forces, are analyzed by the simulation and experimental results, respectively. Secondly, design...
Irreversible demagnetization which occurs in permanent magnet (PM) due to high temperature is main issue in design of traction motor for hybrid electric vehicle. In order to prevent irreversible demagnetization, eddy current loss in PM should be minimized. This paper deals with the optimum design to reduce eddy current loss in PM. Indirect method is used to instead of direct calculation of eddy current...
This paper presents methods to reduce acoustic noise in interior permanent magnet (IPM) motor during design stage. Mechanical and magnetic sources are considered to reduce noise of the machine, and structural and electromagnetic designs are performed. In the structural design stage to reduce mechanical source, the structural resonances are moved to higher frequency for enhancement of stiffness. Then,...
A study on magnetic force is more important than other factors, because acoustic noise of motors is mainly affected by vibration of structure. Especially, harmonics of normal force are associated with resonant frequency of structure. Therefore, although cogging torque and torque fluctuation influenced by tangential force are important factors in output characteristic, the normal force is more important...
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