Направление: 140400 «Электроэнергетика и электротехника»

Контрольное задание №1

Вариант 1

1. Найдите в правой колонке русские эквиваленты английских слов и словосочетаний:

1. direct current (d.c.) a. вращающий момент

2. alternating current (a.c.) b. двигатель с параллельным возбуждением

3. armature c. якорь (арматура)

4. winding d. источник энергии

5. field coil e. двигатель с последовательным возбуждением

6. load f. станок

7. circuit g. щетки

8. machine-tool h. постоянный ток

9. torque i. нагрузка

10. brushes j. двигатель со смешанным возбуждением

11. shunt motor k. катушка индуктивности

12. series motor l. обмотка

13. compound motor m. электрическая цепь (схема)

14. power supply n. переменный ток

2. Переведите на русский язык встречающиеся в тексте интернациональные слова:

synchronous motor; induction motor; single-, two-, three-phase motor; armature; constant speed motor; machine; manner; principal; pole; start.

3. Прочтите текст и выполните следующие за ним упражнения:

Electric Motors

1) There is a wide variety of d. c. and a. c. motors. There are shunt motors, series motors, synchronous motors, induction motors, single-, two-, and three-phase motors. They are used to drive various machines.

2) Direct-current motors are of three principal kinds, and are named according to the manner in which their field coils are connected to the armature. They are named respectively: series, shunt, and compound.

3) In the series motors the field windings and armature are connected in series with each other. All the current which passes through the armature passes through the field coils. Starting under heavy load, a series motor will take a large current to provide the huge torque.

4) The field coils of shunt motors are connected direct across the brushes. The shunt motor may be called a constant speed motor, and is used for driving machine tools, lathes, wood-working machines and any machines requiring a steady speed.

5) The features of the shunt and series type of motors may be combined in one machine. This arrangement gives the compound motor. There are two windings on each field pole; a heavy or series winding for carrying the armature current, and a shunt winding connected to the power supply.

6) The compound motor may have a higher starting torque than a shunt motor and a more constant speed under changing load conditions than the series motor.