O‘zbеkiston rеspublikasi oliy va o‘rta maxsus ta'lim vazirligi

CONTENT 
INTRODUCTION
………………………………………………………….15 
1. GENERAL INFORMATION ABOUT ELECTRIC
DRIVES
…………………………….……………………………………16
 
1.1. Purpose and functions of the electric drive……………………………...16 
1.2. The role of the electric drive in modern machine technologies…………24 
1.3. Structure of the electric drive……………………………………………26 
1.4. Classification of electric drives………………………………………….31 
1.5. Control questions for self-testing………………………………………..36 
2. FUNDAMENTALS OF ELECTRIC DRIVE
MECHANICSWATER
……………………………..…………………...37 
2.1. Mechanical characteristics of the engine and working mechanism……..37 
2.2. Motor and brake modes of the electric motor…………………………...43 
2.3. Equation of motion of the electric drive…………………………………45 
2.4. Reduced mechanical link………………………………………………...50 
2.5. Control questions for self-checking……………………………………..56 
3. UNREGULATED ELECTRIC DRIVE
………………………..………57
 
3.1. General information……………………………………………………..57 
3.2. Electromechanical properties of asynchronous motors………………….59 
3.2.1. Principle of operation of an asynchronous motor……………………..59 
3.2.2. Mechanical characteristics of an asynchronous motor………………..64 
3.2.3. Starting an asynchronous motor with a phase rotor…………………...71 
3.2.4. Characteristics Of asynchronous motors with closed-loop rotor……...76 
3.2.5. Energy diagram of an asynchronous motor when operating in 
motor mode…………………………………………………………….80 
3.2.6. Changing the supply voltage of an asynchronous motor……………...82 
3.2.7. Braking modes of asynchronous motors………………………………85 
3.2.8. Electromechanical characteristics of multi-speed motors 
asynchronous motors………………………………………………….93 

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12 
3.3. Electromechanical characteristics of synchronous motors electric 
motors…………………………………………………………….……...96 
3.3.1. Principle of operation of the synchronous motor…………….………..96 
3.3.2. Operating Modes of the synchronous motor…………………………101 
3.3.3. Regulation of the excitation current of the synchronous motor……...104 
3.4. Singlephase asynchronous motors……………………………………...108 
3.5. Control questions for self-testing………………………………………110