RESEARCH OF SERVOCONTROLLER FOR DC MOTOR CONTROL

  • TITLE: RESEARCH OF SERVOCONTROLLER FOR DC MOTOR CONTROL
  • AUTHOR(S): P. Prodanov
  • ABSTRACT: Servomotor drives are one of the most used to control of different production processes. They are used where it is necessary precision speed control, torque and position. In these drives is used a servo controller with a proper feedback to precisely control specifications. In this paper has been investigated servo controller that provides three modes - mode with adjustable voltage, mode with a constant torque and mode with constant speed.
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ESTIMATION OF OPTIMAL FLYWHEEL MASSES OF FORGING FLY-PRESSES

  • TITLE: ESTIMATION OF OPTIMAL FLYWHEEL MASSES OF FORGING FLY-PRESSES
  • AUTHOR(S): S. Rachev, K Karakulidis
  • ABSTRACT: Paper deals with dynamic behavior of the forging fly-presses driven by induction motors. The static torque-speed characteristic of the induction motor has been used for the investigations done. Suitable software has been used for implementation of mathematical model of forging fly-press drive. Some of the study results have been presented graphically.
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GALVANOMAGNETIC CONTACTLESS PROTECTION OF AC INDUCTION MOTOR

  • TITLE: GALVANOMAGNETIC CONTACTLESS PROTECTION OF AC INDUCTION MOTOR
  • AUTHOR(S): N. Draganov
  • ABSTRACT: The modern automatic control is impossible without motors, which are charged to perform various operations as an essential elements of an automated system. The article presents a preposition of contactless phase failure protection of three-phase induction motor, implemented on the basis of modern galvanomagnetic elements.
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SYNTESIS AND SIMULATION OF PRECODER FROM HDB3 TO BINARY NRZ CODE

  • TITLE: SYNTESIS AND SIMULATION OF PRECODER FROM HDB3 TO BINARY NRZ CODE
  • AUTHOR(S): B. Karapenev, G. Goranov
  • ABSTRACT: This paper presents the fundamental features of the linear and quasi-ternary codes. A block and structural-functional diagram of precoder from quasi-ternary HDB3 to binary NRZ code are presented and described in detail. A circuit (model) of precoder with TTL integrated circuits (ICs) has been synthesized. The obtained simulation results are shown using Electronics Workbench Pro software.
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SYNTESIS AND SIMULATION OF PRECODER FROM BINARY NRZ TO HDB3 CODE

  • TITLE: SYNTESIS AND SIMULATION OF PRECODER FROM BINARY NRZ TO HDB3 CODE
  • AUTHOR(S): B. Karapenev
  • ABSTRACT: This paper presents the essence of the primary binary codes of the digital signal and also of quasi-ternary AMI and HDB3. A block and structural-functional diagram of precoder from binary NRZ to HDB3 code are presented and described in detail. A circuit (model) of precoder with TTL integrated circuits (ICs) has been synthesized. The obtained simulation results are shown using Electronics Workbench Pro software.
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