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7. INDUCTOR, STEPPER AND LINENYE 
ELECTRIC DRIVES
…………………….…………………………….211
 
7.1. Valve-inductor electric drive…………………………………………...211 
7.2. Electric drive with stepper motor……………..……………………….212 
7.3. Electric Drive with linear motors…………………..………………….216 
7.4. Control questions for self-testing………………………………………220 
8. TRANSIENTS IN AN ELECTRIC DRIVE
………………...………...220
 
8.1. General information……………………………………………………220 
8.2. Transients determined by the mechanical inertia of the electric drive…225 
8.3. Transients in a DC electric drive……………………………………….229 
8.4. Control questions for self-checking……………………………………239 
9. CONTROL DEVICES AND DEVICES
………………...…………….240
 
9.1. Control and protection Equipment for electric drives………………….240 
9.2. Contactless logic elements……………………………………………..244 
9.3. Sensors for mechanical and electrical parameters…………….………..247 
9.4. Regulators………………………………………………………………253 
9.5. Microprocessor controls for electric drives…………………………….256 
9.6. Complete control devices for electric drives…………………………...260 
9.7. Control questions for self-testing………………………………….…...262 
10. TYPICAL NODES AND CONTROL SCHEMES 
ELECTRIC DRIVES
………………………………………………….263
 
10.1. Electrical protection…………………………………………………..263 
10.2. Relay-contactor control of electric drives…………………………….265 

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10.3. Principles of construction of control systems for electric drives……..273 
10.4. Classification of closed control systems……………………………...276 
10.5. Control system for a DC electric drive with the summing amplifier…280 
10.6. Multi-loop system with a subordinate regulation parameters of the
electric drive…………………………………………………………..285 
10.7. Typical control systems for asynchronous frequency Controlled electric
drives…………………………………………………………….……297 
10.8. Control questions for self-checking…………………………………..303