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Jumardi
Program Studi Teknik Elektronika, Politeknik Pratama Mulia Surakarta
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering

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Penerapan Teknik Hard dan Soft Switching pada Motor Switched Reluctance 3 Fasa Menggunakan Psim Jumardi; Salechan
Politeknosains Vol 16 No 1 (2017): Jurnal Politeknosains Volume 16 Nomor 1 - Maret 2017
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Politeknik Pratama Mulia Surakarta

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Abstract

Classic converter is a series of power converters required to activate and deactivate the motor SRM (switched reluctance motor) which consists of two switches (IGBT) and two diode flywhell for each phase Before making the appliance power converters are real, necessary modeling to know and understand the behavior and the interaction between these converters with a motor. In this study, classic converter modeled with PSIM software to recognize performance by applying the hard and soft switching techniques. Mechanical hard switching is a condition where the second IGBT current on and off is made in the same time, while the soft switching technique is a condition in which the second working IGBT current on and off is made in different time. In order to implement these two techniques required angle and angle on the pulse. On the corner is a corner to produce forward rotation, the magnitude of 900. The pulse angle is the angle to produce the desired rotation and torque (set pulse width), the magnitude of 00 - 1200. angle and angle on a series of pulses inserted into the controller to turn on and off a series of classic converter which supplies the source voltage to the stator coil. Mechanical hard switching produce rotation, minimum torque, which is greater than the voltage soft switching techniques. Soft switching technique produces motor current and losses in semiconductor that is larger than the hard switching techniques. Mechanical hard switching. generates maximum torque similar to a soft switching technique (1.213 Nm and 1.216 Nm).
Kinerja Room Air Conditioner (RAC) Window Berdasarkan Variasi Tekanan Pengisian Jumardi
Politeknosains Vol 15 No 1 (2016): Jurnal Politeknosains Volume 15 Nomor 1 - Maret 2016
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Politeknik Pratama Mulia Surakarta

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Abstract

This research was started with making the practice of media of Window Air Conditioner which will be used to teach Practice Refrigeration and Air conditioner subjects. The objective of this media was to explain the name, function, layout of the electrical and main components, R-22 circulation, evacuating the system, charging, and the working principle of the electrical system. The Media of window air conditioner was made in the Laboratory of Bench Work and Electrical Power Engineering in Politama Surakarta, which consists of the electrical and main components, and wiring diagram. The data were collected by observation, interview, and documentation. The research began by testing the system, namely: evacuating the system, then R-22 charging. The pressure of R-22 charging was varied from 23%, 38%, 45%, 55%, and 60% of the high pressure standard. The standard pressure on the window air conditioner was 4.8 bar or 70 psig with evaporation temperature 50C ( the low pressure side), and 16.3 bar or 236 psig at a temperature of 450C condensation (the high pressure side). The standard electric current in this research was 3,6A for compressor motor and 0,1A for fan motor. Data were analyzed by comparing the results of research observation with its default value, hereafter are described in percentages. Based on the research results, the system can achieve the vacuum pressure -30 in Hg within 3 minutes, and didnot experience leakage within 24 hours. The electric current on the compressor motor is proportional with increaseing charging pressure (42% - 61% of the standard current). The electric current of the fan motor in accordance with nameplate or standards, 0,1A (0%). The biggest percentage of input temperature is the evaporator (420% - 480%), then the compressor (164% - 173%), thereafter the condenser (51% - 61%) and the smallest is the capillary tube (29% - 38%). The biggest percentage of output temperature is the capillary tube (420% - 480%), then the evaporator (164% - 173%), thereafter the compressor (51% - 61%) and the smallest is the condensor (27% - 32%).The working principle of the media of window air conditioner consists of five positions, namely: Off, Fan, Super Quiet, Normal, and High Power.
Co-Authors Salechan