A Hydraulic Rotary Switched-Inertance Servo-Transformer

1988 ◽  
Vol 110 (2) ◽  
pp. 144-150 ◽  
Author(s):  
F. T. Brown ◽  
S. C. Tentarelli ◽  
S. Ramachandran
Keyword(s):  
Steady State ◽  
High Frequency ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Complete Solution ◽  
Partial Solution ◽  
State Theory ◽  
Novel Approach ◽  
Flow Through ◽  
Theory And Experiments

Switched-reactance hydraulics represents a radically novel approach to the control of fluid power, since the proportional metering of flow through adjustable orifices is eliminated, and the inertive properties of the fluid substituted. Potential advantages in bandwidth, linearity, and efficiency have been indicated. This paper presents the first steady-state theory and experiments with a rotary fluid switch, which accomplishes the needed pulse-width modulation at a desirably high frequency. Cavitation problems are observed, means of their partial solution are implemented, and means of a more complete solution are indicated.

scholarly journals Analysis of Sinusoidal Pulse Width Modulation Parameter Settings in High Precission Closed Loop Full Bridge Bipolar Inverters for High Voltage High Frequency Generator

Teknik ◽  
2020 ◽  
Vol 41 (1) ◽  
pp. 55-61
Author(s):  
Abdul Syakur ◽  
Arifin Wibisono
Keyword(s):  
High Voltage ◽  
High Frequency ◽  
Pulse Width ◽  
Large Scale ◽  
Closed Loop ◽  
Pulse Width Modulation ◽  
Waste Treatment ◽  
Electrical Energy ◽  
Loop Control ◽  
Sinusoidal Pulse Width Modulation

The application of high voltage becomes more important and wider. High voltage is needed in the process of reducing air contaminants, waste treatment, sanitation, disinfecting microorganisms, testing for insulating high voltage equipment, and transmitting electrical energy. The problem of high voltage AC generation system is still in a large scale, static, not portable, and very expensive. This paper presents an analytical design of a high-voltage AC high-frequency based on power electronic. It is portable, less expensive, and eaasier to control the amplitudo and frequency. The application of the Full Bridge Bipolar Inverter topology with the Sinusoidal Pulse Width Modulation switching method provides variable sinusoidal AC voltage outputs (Vo) on its amplitude and frequency. The Tesla Coil Transformer amplifies the amplitude in accordance with the classification of the high voltage AC in the order of Kilo Volt. The Closed Loop control system in the Bipolar Inverter Full Bridge topology provides high accuracy results between the given setting values and the actual amplitude output and the expected high-frequency AC voltage. Analysis of the SPWM switching pattern parameter settings shows stability for several loading variations

scholarly journals DESAIN SIMULASI SISTEM PENGATURAN KECEPATAN MOTOR INDUKSI TIGA FASA DENGAN SWITCHING SPACE VECTOR PULSE WIDTH MODULATION

2019 ◽  
Vol 6 (1) ◽  
pp. 24-31
Author(s):  
Muhamad Yusuf ◽  
Vicky Prasetia ◽  
Sugeng Dwi Riyanto ◽  
Arif Ainur Rafiq
Keyword(s):  
Steady State ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Space Vector

Motor induksi telah dimanfaatkan industri sebagai sumber energi mekanik. Motor induksi sangat handal, murah, dan mudah dalam perawatannya. Motor induksi sulit dikendalikan karena salah satu kategori plant nonlinier. Salah satu cara yang digunakan untuk mengatur kecepatan motor induksi adalah mengatur vektornya. Agar motor induksi mudah untuk dikendalikan seperti motor dc penguat terpisah, maka motor induksi dimodelkan dalam referensi sumbu putar (model d-q). Penelitian ini menerapkan skema pengaturan kecepatan motor induksi menggunakan Switching Space Vector Pulse Width Modulation (SVPWM). Sistem ini menghasilkan error steady state rata-rata di bawah 4 (empat) rpm atau sebesar 0,3 % dengan diberi torsi beban antara 5 Nm sampai 35 Nm.

Non-Isolated Bidirectional DC-DC Converter with Step up-down Capability Based on Energy Materials

2012 ◽  
Vol 459 ◽  
pp. 44-46
Author(s):  
Hyun Lark Do
Keyword(s):  
Steady State ◽  
Pulse Width ◽  
Power Flow ◽  
Pulse Width Modulation ◽  
Boost Converter ◽  
Experimental Results ◽  
Switching Frequency ◽  
Energy Materials ◽  
Steady State Analysis ◽  
Power Switches

A non-isolated bidirectional DC-DC cconverter with step up-down capability is proposed in this paper. The proposed converter operates with a fixed switching frequency and has a step up-down capability regardless of the direction of power flow. Voltage stresses of the power switches are lower than those in the conventional buck-boost converter. Moreover, only a single magnetic component is required in the proposed converter. An asymmetrical pulse width modulation (APWM) control shceme is utilized. The operation principle and steady-state analysis of the proposed converter are provided. A prototype of the proposed converter is developed, and its experimental results are presented for validation

scholarly journals Common-Mode Reduction SVPWM for Three-Phase Motor Fed by Two-Level Voltage Source Inverter

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3884
Author(s):  
Jian Zheng ◽  
Mingcheng Lyu ◽  
Shengqing Li ◽  
Qiwu Luo ◽  
Keyuan Huang
Keyword(s):  
High Frequency ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Voltage Source ◽  
Switching Frequency ◽  
Voltage Source Inverter ◽  
Large Magnitude ◽  
Common Mode ◽  
Common Mode Voltage ◽  
Three Phase

Aiming at the problem of large magnitude and high frequency of common-mode voltage (CMV) when space vector pulse width modulation (SVPWM) is used in a three-phase motor fed by a two-level voltage source inverter, a common-mode reduction SVPWM (CMRSVPWM) is studied. In this method, six new sectors are obtained by rotating six sectors of conventional SVPWM by 30°. In odd-numbered sectors, only three non-zero vectors with odd subscripts are used for synthesis, while in even-numbered sectors, only three non-zero vectors with even subscripts are used for synthesis. The actuation durations of three non-zero vectors in each switching period in each sector are given. Simulation and experimental results show that, compared with the conventional SVPWM, the CMV magnitude of CMRSVPWM is reduced by 66.67% and the CMV frequency of CMRSVPWM is reduced from the original switching frequency to the triple fundamental frequency. At the same time, the current, torque and speed of the motor are still good.

Sign in / Sign up

Export Citation Format

Share Document