1.4 Caractéristiques:Le rendement e

1.4 Caractéristiques:
Le rendement et le facteur de puissance des moteurs asynchronies monophasés àpuissance
Fractionnaire est habituellement bas. Ansi , à pleine charge ,un moteur de 186w (1/4hp) a un
Rendement et un facteur de puissance l’ordre de 60%.
En raison du courant d’excitation élevé, le courant à vide est compris entre 70 % et 90 % du courant de pleine charge . Par consequent , meme pour la marche à vide , ces moteurs atteeignemt un échauffement se rapprochant de la moitié de cleui à pleine charge.
Le ( Tableau 1.1) donne les caractéristique d’un moteur asynchronies monophasés 0démarrage par condensateur , ayant une capacité de 250w (1/3hp),1760 r/min,115v,60hz.
De la (figure 1.6) les courbes du couple en function de la vitesse pour ce meme moteur, On constate que pendant la période d’acc”l”ration ,l’enrolement auxiliaire proudisent ensemble snsemble un couple trés élevé comparativement au couple nominal de la machine par consequent à moins que l’inertie de la charge soit très élevée ,le moteur attaint sa vitesse nominale en une fraction de second.

النتائج (الإنجليزية) 2:

1.4 Features:
Performance and power factor of asynchrony phase motors àpuissance
Fractional is usually low. Ansi, at full load, a motor 186W (1 / 4hp) has a
performance and a power factor of about 60%.
Due to the high excitation current, load current is between 70% and 90 % of full load current. Therefore, even for dry run these engines atteeignemt overheating approaching half cleui at full load.
The (Table 1.1) shows the characteristic of a single-phase motor asynchrony 0démarrage capacitor, with a capacity of 250w ( 1 / 3hp) 1760 r / min, 115v, 60hz.
From (figure 1.6) the curves of torque speed function for this same engine is found that during the period of access "l" ration, the Auxiliary enlistment proudisent snsemble set a very high torque compared to the nominal torque of the machine therefore unless the load inertia is very high, the attaint motor rated speed in a split second.

النتائج (الإنجليزية) 3:

1.4 Specifications:
the performance and the power factor of the asynchronies motors single-phase àpuissance
Fractional is usually low. Ansi , at full load ,a engine of 186w (1/4hp) has a
performance and a power factor of the order of 60 % .
due to the excitation current high, the idle current is between 70 % and 90 % of the full load current . CONSEQUENTLY ,Same for the market to empty , these engines atteeignemt a warm up closer to the half of peice piece at full load.
The ( Table 1.1 ) gives the characteristic of a motor single phase asynchronies 0starting by capacitor , having a capacity of 250w (1/3hp),1760 r/rpm115V,60hz.
of the (figure 1.6 ) the curves of the torque in function of the speed for the same engine,We found that during the period of acc"l"ration ,the enlistment proudisent auxiliary set generally enjoyed by a very high torque compared to the nominal torque of the machine therefore at least that the inertia of the load is very high ,the engine Alzheimer its rated speed in a fraction of second.