Английский язык. Арланова Т.Л - 21 стр.

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21
B
When current flows, the armature becomes an electromagnet. Its north pole
is attracted by the south pole and repelled by the north pole of the field
magnet.
C
When a universal motor is run on direct current, the magnetic poles in the
armature change while those of the field magnet remain constant.
D
When the commutator comes back into contact with the brushes, current
flows through the armature in the opposite direction. Its poles are reversed
and the turn continues.
Exercise 6. Try to answer this question:
What does an electric motor do?
When we answer a question like this. we describe the function of something.
We can describe the function of an electric motor in this way:
An electric motor converts electrical energy to mechanical energy. We can
emphasize the function like this:
The function of an electric motor is to convert electrical energy to mechanical
energy.
Make sentences matching motor components to their functions given in the
table.
Component
Function
1 Armature a transfers rotation from the motor
2 Bearings b create an electromagnetic field
3 Brushes c converts electromagnetic energy to
t
ti
4 Commutator d reverses the current to the armature
5 drive shaft e support the drive shaft
6 field windings f supply current to the armature
Exercise7. Now study this description of the motor.
A simple dc motor consists of a field magnet and an armature. The
armature placed between the poles of the magnet. The armature is made up
of a loop of wire and a split ring known as a commutator. The loop is
connected to the commutator. Current is supplied to the motor through
carbon blocks railed brushes.
To write a description, you need to use language to:
1 dismantle a piece of equipment into its main parts. These expressions
will help:

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