- TITLE:
TRANSFORMER INDUCTION WATER HEATER
- AUTHOR(S):
P. T. Ivanov, R. G. Ivanova
- ABSTRACT:
The present report focuses on submersible transformer induction heater for liquids and in particular for water, operating directly from the power supply grid. The proposed heat exchanger design provides both a relatively large contact area with the liquid (efficient heating) and high cos transformers induction heater.
- 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.
- 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.
- 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.
- 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.
