منابع مشابه
Ball-Bearing Motor
The discovery/invention of the ball-bearing motor is attributed to Milroy [1]. It has been discussed several times, with conflicting explanations [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]. This solution is a much simplified version of that given in [7]. Because the motor is weak, it is helpful to reduce friction on the axle by connecting the high-current lead to the outer races of the ba...
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Maxwell pressure is the cause of stator deflection at the origin of acoustic noise radiated by stator. That is why precise determination of air-gap radial flux density Bg is of prime importance. It could be obtained by finite element method, semi numerical or totally analytic method with computation of magneto motive force and permeance. Slot number, pole pair number and PWM affecting acoustic ...
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Introduction Bar extrusion is a process in which a block of metal (billet) is forced to flow by compression through a tool (die) opening of a smaller crosssectional area than that of the original billet. There are two basic types of bar extrusion: direct and indirect. The most important and common method used is the direct extrusion (Lange 1988). Figure 1 shows the principle of direct bar extru...
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A good agreement is obtained between experiment and hybrid calculation. Due to structural modelling inaccuracies, the full numerical prediction shows some deviations. However, it appears that a simple BEM model is capable of predicting the general acoustic behaviour of a complex vibrating structure. A sound reduction, specifically in the high frequency range, is obtained with a viscoelastic bea...
متن کاملStudy Relation between Fault Noise in Electric Motor
In this paper, the noise of electric motors is analyzed in order to obtain information for the detection of faults. Significant noise spectrum differences between healthy motor and motors with different faults are observed. The faults analyzed are bad bearing in the three phase induction motor and broken bars in single phase induction motor. The high-frequency spectral analysis of noise provide...
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ژورنال
عنوان ژورنال: Bulletin of JSME
سال: 1964
ISSN: 0021-3764,1881-1426
DOI: 10.1299/jsme1958.7.200