Abstract
IPM (Interior Permanent Magnet) motors produce torque based on two different mechanisms. The first of them is permanent-magnet torque, which is generated by the flux linkage between the PM (Permanent Magnet) rotor field and the electro-magnetic field of the stator. It is the same torque as produced by SPM (Surface Permanent Magnet) motors, however, IPM designs produce another force known as reluctance torque. The second one, the shape and location of the slots in the rotor laminations are designed to channel magnetic flux so that even if the slots were left as air gaps, the rotor would experience a force to align the magnetic flux lines with those generated by the stator coils. IPM motors are now very popular in industrial and military applications by providing high power density and high efficiency compared to other types of motors. This paper presents the use of finite element method harmonic analysis for investigation of IPM motor acoustics noise. This method is useful for DC (Direct Current) motor designs in many industrial and military applications.
Highlights
These days’ trend is fastening the production rate while lowering the costs
When electrical rotatory machines are running, they always produce noise related to the movement of various parts of the machine
We divide the noise into three groups: electromagnetic, mechanic and ventilating considering their origin
Summary
These days’ trend is fastening the production rate while lowering the costs. This, places high demands on the dynamic characteristics that affect overall machine behaviour. Mačák much more probable that it will match the frequency of the induction signal. It causes vibrations, which lowers the quality of machining of the product and may even cause some damage to the machine. Resonation is a result of a forced oscillation, when the inducing frequency matches the own frequency of the system. Each contribution is characterized by modal frequency and modal shape of the oscillation [1] The knowledge of these data helps to avoid collisions even in the phase of designing of the construction. If the inducing frequency matches the own frequency of the construction, the resonation will occur and the machine could be badly damaged due to it. The model is composed of three main parts: electromagnetic, mechanical and acoustic
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