By Michael V. Glazoff, Vadim S. Zolotorevsky, Nikolai A. Belov

This monograph summarizes learn carried out at Moscow Institute of metal and Alloy in the course of many a long time partly including Alcoa Inc.

The study coated components of the constitution, homes, thermal resistance, corrosion and fatigue of aluminum alloys in business manufacturing.

Many Machinist initiatives, would receive advantages from analyzing this book.

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The performance 58 Characteristics equations are presented in a way which enables the effect of a change in voltage at a given speed to be estimated readily. 6 Efficiency 2 A n estimate of efficiency based only on the armature I R loss in the simple model would be misleading, particularly at low values of current. For a shunt- or separately excited machine operating over a small range of 4 4 ,54 speeds, there are three main components to the losses, as f o l l o w s : (1) Brush contact losses which are proportional to armature current.

F. induced from the excitation winding into the coils undergoing commutation. f. is frequency-dependent and cannot be compensated, at all speeds, by the normal use of interpoles. * It should, however, be pointed out that successful traction motors, for operation at 50 Hz, have been built in France. *It would seem to be logical to reduce the operating frequency of the motor to zero, as is done in the modern U K mainline traction system. However, full-wave rectification of a single-phase, 50 Hz supply introduces a 100 Hz component which contributes to the commutation problem.

E f by control of the field current, and the power component of armature current I a p by control of the load applied to the shaft. 6. When one or other of these parameters is changed there is a momentary change in speed and load angle. If, under the changed conditions, the load is less than the maximum the machine can sustain, torque tending to restore the rotor to synchronism is developed. 33) / per electrical radian of displacement. The synchronizing torque has a maximum value at zero load, where δ is zero, and a value of zero, representing the limit of steady state stability, when c 6 2 = *" 2 [ E f + 8 V (XJXsq .

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