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1. The dc machine consists of two main parts: a) the stationary part & b) the r... p... 2. The stationary part comprises the m... p..., the commutating poles, the frame. 3. The armature comprises a slotted armature core, a winding inserted in the armature slot, the
c... & the brush gear.
42. / 10 мин./ Прочитав текст, объясните по-русски, что изображено на Рис. 8 $
Automation Means of Control & Inspection Relays
The most common relay types are ther’elapper-armature & the pull-in armature dc relays shown in Fig.8.Th the former the contacts are closed in the energized position when a current energizes a coil.
1. The magnetic flux generated by the coil closes on the magnetic circuit consisting of a core 2, a yoke 3, an armature 6, & an air gap in the overcoming the action of spring 4, to press against the core
2, closing contacts 8, allowing a current to flow through the output circuit. Reset of contacts in the de-energized position of the relay may, however, be prevented or delayed due to hysteresis>4effect. This difficulty is overcome with the aid of a nonmagnetic spacer 7 inserted between the armature 6 & the core 2 to ensure an easy separation. In the pull-in armature dc relay /Fig.8b/ the contacts are closed also in the energized position when a core 2 /which is also the armature/ pulls in due to magnetic forces & thus closes contacts. 4. These reset in the de-energized position of the relay by the action of a spring or pull of gravity. The relays used for the switching of high current circuits are called contactors. The above-mentioned relays are also known as neutral because they do not'depend for their operation on the polarity of the energizing current, those which do are called polarized or polar relays, a permanent providing the magnetic bias. The polarized relays may be of two types: biased & unbiased, these last are often called the center-adjusted devices.
43. /10 мин./ Из следующих предложений выпишите 9 словосочетаний, состоящих из двух существительных. Переведите их.
1. Squirrel-cage motors have two main parts. 2. The stator is contained in the motor’s stationary frame. 3. The rotor is mounted on the drive shaft. 4. The flow of ac sets up a magnetic field. 5.The rotor of a squirrel-cage motor consists of laminated iron & the squirrel-cage conductors. 6. The conductors recess into slots in the laminated core. 7. All conductors of a squirrel-cage rotor are mechanically & electrically connected by end rings. 8. The cage conductors & end rings of smaller rotors are generally die cast into the rotor. 9. With larger machines, rotor conductors are brazed or welded to end rings. lO.-Experiments with aluminium die casting of rotor cages started in the early 30’s.
