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1. Motors are used for converting different forms of energy into mechanical energy.

2. The main part of a motor is a coil or armature. The armature is placed between the poles of a powerful magnet. When a motor is put into operation current starts flowing through the coil (armature) and the armature starts rotating.

3. Electric motors are necessary for all branches of industry, transport and agriculture. They are used in industrial plants, and operate under different conditions, both favourable and unfavourable for their service life. Because of their different applications, motors are manufactured in many different designs.

4. Each motor has a nameplate attached to its frame. The nameplate bears machine ratings. To these belong: output power in kilowatts, voltage, the rated current, the starting current, the power factor, the efficiency, the rated torque.

5. These machine ratings are important for the use of motors during their service life-which is normally equal to about 10 years, provided the operating conditions are favourable. Under abnormal and unfavourable conditions it is much shorter. Thus normal and favourable ambient conditions are very important for the length of a motor's service life.

6. According to the type of energy required for their operation, electric motors are divided into d.c. and a. c. motors.

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Прочтите внимательно два последних абзаца и скажите, в чем состоит разница между двигателями постоянного и переменного тока

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2.10.6 Какой «документ» имеет каждый двигатель и какие сведения можно узнать, прочитав его

Date: 2016-02-19; view: 1545; Нарушение авторских прав