Vocabulary.

Rotating dc field system – система вращающейся обмотки возбуждения

Solid forged steel – монолитная прокованная сталь

Cross-sectional view – вид в поперечном разрезе

Cutaway view – изображение с частичным разрезом

Rotor-end windings/ overhangs – роторная концевая обмотка/ лобовая часть обмотки

Punchings – отверстия

Retaining ring – пружинное кольцо

Phase spread – сдвиг фазы

Double-layer lap winding – двойная петлевая обмотка

Wye-connected machine – машина с соединением звездой

Securely braced – надежно закреплена

A set of copper/brass bars – установка медных/ латунных шин

Pole-face slot – паз в торце полюса

Damping rotor oscillations – затухающие колебания на роторе

Solid state excitation system – система возбуждения твердого состояния

Shaft-mounted rectifier – выпрямитель, монтируемый на валу

To dissipate – рассеивать

Overall physical size – полные размеры

5. Answer the questions.

1. What are the two basic parts of a synchronous machine?

2. Why is the use of a rotating dc-field system almost universal?

3. What kind of armatures and field structures do modern synchronous machines have?

4. How may be the rotor constructed?

5. What is a turbogenerator?

6. What kind of rotors do turbogenerators have?

7. What kind of machines are diesel-electric generators?

8. What do constructional details depend on?

9. How must the rotor-end windings be secured?

10. What can you say about the stator of a synchronous machine?

11. What do damper winding consist of?

12. What is the exciter?

13. How may the dc excitation be provided?

14. What are the two types of solid state excitation systems?

15. What should be done with heat in a synchronous machine?

16. Which is the most serious problem in large turboalternators?

6. Fill in the missing words:

1. The magnetic field structure, carries_____, and the armature, often has _____ in which _____ is generated.

2. The rotating dc-field system permits the ac windings_____ , where they are more conveniently braced against _____ and insulated for _____.

3. The prime-mover speed has a profound influ­ence on _____ .

4. While the water-wheel-driven hydroelectric gen­erators are commonly of _____ with vertically mounted _____ rotors, most of the others, including turbine-generators, are of_____.

5. Almost all synchronous generators are _____machines with a 60° phase spread.

6. Many salient-pole synchronous machines are commonly equipped with _____.

7. _____of a turbine-generator may be considered as equivalent to _____of infinitely many circuits.

8. A self-excited or a permanent-magnet type _____may be employed _____ the exciter.

9. Static systems have stationary _____ that supply _____ to the rotor through brushes and slip rings.

10. Brushless system has _____ rotating with the rotor, thereby eliminating the need_____.

11. _____ methods, using hydrogen or water as coolant, have made it possible to achieve two-pole turbogenerator ratings of _____in a single unit.