Vocabulary.

Useful tasks – полезные задачи

To consume – потреблять

Linear lumped circuit – линейно-блоковая цепь

Inner/outer – внутренний/внешний

Radial dimension – радиальные размеры

Primary source – первичный источник

Laminated iron core – сердечник набран из железных пластин

Protruding pole – выступающий полюс

Field coils distributed in slots –катушки индуктивности расположены в пазах

From the coupled-circuit viewpoint – с точки зрения связанной цепи

Sets of linear lumped circuits – участки линейно-блоковой цепи

Restricted to one degree of freedom – ограничен одной степенью свободы

5. Answer the questions.

1. What is the main purpose of most rotating machines?

2. What is the idea of electromechanical energy conversion?

3. What is the main principle that all such machines operate on?

4. What is the coupled-circuit viewpoint based on?

5. Which two members of the electric machine does relative motion exist be­tween?

6. Why does an electrical machine consist of two sets of windings?

7. What is an air gap and what is it needed for?

8. What is the function of the field winding?

9. What is the function of the armature winding?

10. What can be used as the primary source of flux in small machines?

11. Why is the iron core laminated?

12. What is the difference between salient-pole arrangement and non-salient-pole arrangement?

6. Translate word combinations in brackets into English.

1. Rotating machines (различаются по размерам и мощности) from small motors that (потребляют) only a fraction of a watt to large generators that produce several hundreds of megawatts.

2. (Относительное движение) exists be­tween the two (магнитными частями) of the electric machine, namely, the stator and the rotor.

3. The mechanical motion between these two (группами катушек) is generally (ограничено одной степенью свободы).

4. The (радиальная длина) of the (воздушного зазора) is always kept very small in order to produce a large (магнитное поле) for a given current.

5. While ((постоянные магниты) can be used in the small machines as the (первичные источники) of flux, in the majority of machines the field is electromagnetic.

6. In the (расположении выступающего полюса) the (катушки возбуждения) are concentrated and wound around the (выступающих полюсов).

7. In the (конструкции с невыступающим полюсом) for smooth (or uniform) air-gap ma­chines the field coils (распределены) in slots cut into a cylindrical mag­netic structure.

7. Complete the sentences with given words.

Two sets of windings, in which the working emf is induced, salient-pole arrangement, to align themselves, iron core, electro­ mechanical energy conversion, large ac generators, the flux density.

1. The main purpose of most rotating machines is _____.

2. All rotating machines operate on the same principle, namely, the tenden­cy of two magnets _____ .

3. Electrical machines consist of _____ (or coils) in which one set of coils can rotate with respect to the other.

4. The two windings in relative motion are known as the field winding, which produces _____, and the armature wind­ing _____.

5. The _____ forming this structure is laminated in order to reduce the field iron losses.

6. The _____ is used only for machines with direct-current field supply.

7. The non-salient-pole construction is commonly used on certain forms of _____ known as turbo-alternators.