4. Match the words and word combinations (a-e) to the sentences (1-5)

1. windings

2. magnetic path

3. rotor

4. stator

5. frame

1. The outer cylindrical … of the motor may include feet or a flange for mounting.

2. The … is supported at each end on bearings.

3. To have a high power rating of the motor the cross-sectional area of insulated electrical … must be large.

4. The outer stationary part of the motor is called a … .

5. To reduce eddy currents as well as to lower losses and heating the … is laminated.

5. Answer the questions to the text

1. What types of electrical circuit can have the rotor?

2. What does the wound rotor comprise?

3. What does the squirrel cage rotor comprise?

4. The AC induction motor comprises two electromagnetic parts: stator and rotor. What other parts are required to complete it?

5. Where does the steel shaft transmit the torque?

6. What kind of cooling does the fan provide for the stator and rotor?

6. Say if the statements to the text are true or false

1. Two bearings support two end-flanges.

2. Cooling fan is located at the drive-end.

3. The rotating shaft is supported by two bearings.

7. Translate the sentences paying attention to Indefinite Tenses in Active and Passive. Correct the mistakes in the sentences.

1. Current flow through the copper or aluminum bars and not in the laminations.

2. Slots is connected to an end-ring at each end of the rotor.

3. Rotor bars is in direct contact with the steel laminations.

4. Wound rotor type of motor are often referred to as a slipring motor.

5. To receive the external electrical connections there are a terminal box on the top on either side of the frame.

Text c Principles of operation

1. Listen to the words and word combinations from the text. Pay attention to their meaning.

supply – джерело постачання

power supply – джерело живлення

terminal – вивід

set up – викликати, спричиняти

flux – потік

magnetic flux – магнітний потік

speed – швидкість

be in synchronism with – бути синхронним з ...

produce – створювати

synchronous speed – синхронна швидкість

perimeter – периметр

cycle – цикл

supply voltage – напруга живлення

revolution – оберт

per – за, на

pole – полюс

pole-pair – пара полюсів

permanent – постійний

magnet – магніт

interact – взаємодіяти

induce – наводити, індукувати, збуджувати, викликати

induced current – індуктивний струм

air-gap – повітряний зазор.

2. Find the words and combinations of words in the text and translate the sentences containing them.

arrange – розміщати, розташовувати

fit – установлювати, складати, збирати, монтувати, приганяти

suit – задовольняти, відповідати

establish – створювати, установлювати

iron path – магнітопровід

penetrate – проникати

cut – перетинати

rate – швидкість

short circuited – коротко замкнутий, закорочений

rotational force – обертаюча сила

reduce – зменшувати

direction – напрямок

accelerate – прискорювати

starting – запуск, пуск

decrease – зменшувати(сь), спадати, знижувати(сь)

proportionately – пропорційно

settle – установлюватись

overcome – подолати

friction – тертя

windage – опір повітря

draw – живитись

actual speed – дійсна швидкість

slip – ковзання

slip speed – швидкість ковзання.