Instant, n. - момент

load, n. - груз, нагрузка

motor, n - мотор, двигатель .

large-size motors - крупные двигатели

medium-size motors - двигатели средних размеров

small-size motors - малые двигатели

output, n. - выход (мощности, энергии)

permanent magnet - постоянный магнит

power factor - коэффициент мощности

pole, n. - полюс

shaft, n. - валик

size, n. - размер

speed, n. - скорость

specification, n. - спецификация, подробный

перечень

torque, n. - крутящий момент

watt, n. - ватт

winding, n. - обмотка

zero, n. - нуль

Part I

1. Read and translate the following words:

torque, motor, horsepower, tattings, shaft, medium-size, large-size, small-size, gear, efficiency, power factor, friction, watt, load, armature, speed.

2. Form is many word combinations as you can:

a)

good high low	rated nominal effects of full-load fixed variable starting	torque torques	of an instrument of a motor in balance characteristics
	the equation for the variation of full-load no-load rated	speed	regulation at no load at full load control

b)

the magnetic

field poles parallel series direct alternating

of a magnet connection windings coils current strength regulation structure

circuit

3. Change the following word combinations using the pattern:

the instant of starting => the starting instant

1. the current in an armature

2. a speed of full load

3. the current at starting

4. a current with full load

5. the current in a field

6. a motor with two poles

7. rating of motors

8. a source of power

Part II

1. Choose another word or phrase with the same meaning:

speed, в nominal torque, torque characteristics, the voltage characteristic, velocity, a rated torque, nominal power, rate torque specifications, rated power, the voltage rating.

2. Put in missing preposition or adverb if necessary:

The rated temperature rise... a motor is the maximum permissible increase ... temperature ... a specified ambient temperature ... any molor part... the completion... it's duty cycle. Continuous-duty motors are generally rated ... 40 or 5O С temperature rise... an ambient temperature... 25 C. Intermittent-duty motors are generally rated ...

50 or 55 С temperature rise. ( of, in, above, at, after, of, for, above, of, for )

3. Make questions using the pattern:

The direction of rotation of a motor can be

determined by the right-hand rule =>

1. What can the direction of rotation of a motor be determined by?

2. How can the direction of rotation of a motor be determined?

3. In what way can the direction of rotation of a motor be determined?

1. The efficiency of a unit consisting of a motor and a generator can be determined by the ratio between the power of the generator and that supplying the motor.

2. The rated torque of a motor can be determined through it's nominal power divided by the angular velocity of the motor.

4. Answer the questions (see suggestions in brackets):

1. What is meant by speed regulation? (при шунтировании цепи возбуждения увеличивается скорость вращения, при введении сопротивления в цепь двигателя снижается скорость вращения)

2. How may the direction of rotation of the shunt motor be reversed?

3. (надо изменить направление тока или в якоре, или в обмотке возбуждения)

4. In what way do the variations in the field current affect the variations in the speed of a d-c motor? (уменьшение тока возбуждения приводит к увеличению скорости двигателя)

5. Translate the following word combinations into English:

направление вращения, постоянный ток, параллельное возбуждение, саморегулирование двигателя, вал двигателя, характеристика холостого хода, увеличение скорости, внешни характеристика двигателя, нагрузка двигателя, лабораторные условия.

6. Read and translate the text with a dictionary: