# Electrical Machines Equation

#### mosab1406

##### عضو جديد
السلام عليكم ورحمة الله وبركاتة
هذي معادلات اخذته من الجامعه والمسطلحات الانجليزيه خبلت راسي:86: الي با الاحمر ارجو مساعدتي في هادا
وجزاكم الله خير..

A four-pole wave-connected armature has 51 slots with 12 conductors per slot and is driven at 900 RPM. if the useful flux per pole is 25 mWb,calculate the value of the generated EMF

A d.c motor takes an armature current of 110A at 480 V.The resistance of the armature circuit is 0.2 ohm.The machine has six poles and the armature is lap-connected with 864 conductors. The flux per pole is 0.05 Wb.
calculate a) the speed
b) the gross torque developed by the armature

The torque required to driven a d.c. generator at 15 rev/sec is 2 kNm. The core, friction, and windage losses in the machine are 8 KW. calculate the power generated in the armature winding

A series motor runs at 600 RPM when taking 110 A from a 230-V supply. The resistance of the armature circuit is 0.12 ohm and that of the series winding is 0.03 ohm. calculate the speed when the current has fallen to 50A, assuming the
useful flux per pole of 110 A to be 0.024Wb and that for 50 A to be 0.00155Wb

A shunt generator is to be converted into a level-compounded generator by the addition of a series field winding. From a test on the machine with shunt excitation (field) only, it is found that the shunt current is 4.1 A to give 440 V no no load and 5.8 A to give the same voltage when the machine is supplying its full load of 200 A. The shunt winding has 1200 turns per pole. Find the number of series turns required per pole

A 100-kW, 460-V shunt generator was run as a motor on no load at its rated voltage and speed. The total current taken was 9.8 A, including a shunt current of 2.7 A .The resistance of the armature circuit at normal working temperature was 0.11 ohm . Calculate the efficiency at full load.

والله ولي التوفيق​

### مواضيع مماثلة

#### محمد فرج العبيدي

##### عضو جديد
four-pole wave-connected armature يعني المحرك اربعىة اقطاب والملفات الحثية لها شكل الموجي وهي شكل توزيع الملفات
slot يعنى المجاري التي توضع بها الملفات
900 RPM وهي سرعة المحرك لفة لكل دقيقة revaluation per minute
flux per pole وهي تعني الفيض المغناطيسي الناتج من كل قطب
EMF تعني القوه الدافعة الكهربية المتولدة
d.c motor takes an armature current تعني انه ملفات الحثية لمحرك تيار مستمر يسحب تيار قيمته 110 امبير
poles تعني اقطاب المحرك
lap-connected هذه طريقة ثانية لوضعية ملفات المحرك الاولى الملفات الموجية والثانية الملفات الطبقية lap .
gross torque developed by the armature وهي تعني العزم الناتج من من ملفات الحثية التي تسبب الدوران.