O‘zbеkiston rеspublikasi oliy

UNREGULATED ELECTRIC DRIVE………………………..………57 3.1. General information……………………………………………………..57

2. 
   Electromechanical properties of asynchronous motors………………….59
   
   1. 
      Principle of operation of an asynchronous motor……………………..59
      
   2. 
      Mechanical characteristics of an asynchronous motor………………..64
      
   3. 
      Starting an asynchronous motor with a phase rotor…………………...71
      
   4. 
      Characteristics Of asynchronous motors with closed-loop rotor……...76
      
   5. 
      Energy diagram of an asynchronous motor when operating in
      

motor mode…………………………………………………………….80

6. 
   Changing the supply voltage of an asynchronous motor……………...82
   
7. 
   Braking modes of asynchronous motors………………………………85
   
8. 
   Electromechanical characteristics of multi-speed motors
   

asynchronous motors………………………………………………….93

3. 
   Electromechanical characteristics of synchronous motors electric motors…………………………………………………………….……...96
   
   1. 
      Principle of operation of the synchronous motor…………….………..96
      
   2. 
      Operating Modes of the synchronous motor…………………………101
      
   3. 
      Regulation of the excitation current of the synchronous motor……...104
      
4. 
   Singlephase asynchronous motors……………………………………...108
   
5. 
   Control questions for self-testing………………………………………110
   

4. 
   GENERAL PRINCIPLES OF REGULATION
   

ELECTRIC DRIVE………………………………...………………….112

1. 
   Adjustable electric drive – the main type of automated electric drive. ninety three……………………………………………………………..112
   

4.2. Indicators speed control………………………………………………...115
4.3. Control questions for self-ehamination………………………………...122

5.