Compensation Modeling and Optimization on Contactless Rotary Transformer in Rotary Ultrasonic Machining

2020 ◽  
Vol 142 (10) ◽  
Author(s):  
Jianguo Zhang ◽  
Zhili Long ◽  
Can Wang ◽  
Heng Zhao ◽  
Yangmin Li
Keyword(s):  
Resonant Frequency ◽  
Power Transmission ◽  
Ultrasonic Transducer ◽  
Dynamic Performance ◽  
Input Voltage ◽  
Transmission Efficiency ◽  
Ultrasonic Machining ◽  
Rotary Ultrasonic Machining ◽  
Rotary Transformer ◽  
Received Power

Abstract Rotary ultrasonic machining (RUM) is an effective solution to cut, grind, or drill the advanced brittle hard materials. Contactless rotary transformer, with the advantages of high-power transmission efficiency and reliability, is a potential structure to transmit electric power in RUM. In this study, an impedance model of rotary ultrasonic holder (RUH) is established to find that there exist deviations for the resonant frequency and impedance between the RUH and the ultrasonic transducer, indicating that without compensation the ultrasonic transducer cannot find precisely its own resonant frequency by sweeping frequency. To match the resonant frequency and impedance, four compensation topologies are compared and the Series-Series (SS) topology is discovered as the most suitable option. The compensated capacitance values are determined by visualized solution from the contour line method. Both simulation (from matlab–simulink) and experimental results validate that with compensation elements, the resonant frequency and impedance can be matched precisely between the RUH and ultrasonic transducer and the output voltage and current are with better dynamic performance. Moreover, with the same input voltage, the received power of ultrasonic transducer with compensation capacitors is 7.4 times than the one without compensation. Results verify that the compensation optimization of contactless rotary transformer can improve the vibration amplitude in RUM.

Compensating Resonant Frequency via Adjusting Adjustable Coil Automatically

2019 ◽  
Vol 12 (5) ◽  
pp. 432-438
Author(s):  
Jin Xu ◽  
Yuting Zhao
Keyword(s):  
Resonant Frequency ◽  
Power Transmission ◽  
Reference Value ◽  
Transmission Efficiency ◽  
Theoretical Research ◽  
Future Research ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Resonant Coupling ◽  
Transmission Distance

Background: Detuning is the main problem that affects the efficiency and transmission distance of the resonant coupling Wireless Power Transmission (WPT). The distance of load and the offset of the load position could cause serious detuning. Methods: This paper presents an adjustable coil in which inductance can be adjusted. Then a model of WPT was established that could compensate resonant frequency automatically using the adjustable coil. Next, the relationship between the primary resonant frequency and the transmission efficiency is analyzed from the circuit. The analysis proved that the design of the adjustable coil could improve the transmission efficiency of the WPT system. Finally, a prototype of WPT system was built. Results: The experimental results showed that WPT system with adjustable coil can improve the transmission efficiency which proves the theoretical research. At the same time, it has essential reference value for the future research of WPT. Conclusion: In this paper, aiming at the system detuning caused by some other factors, such as the position shift of the load during the wireless power transmission, an adjustable coil is proposed.

scholarly journals Design and testing of a novel rotary transformer for rotary ultrasonic machining

2017 ◽  
Vol 14 (23) ◽  
pp. 20171033-20171033 ◽  
Author(s):  
Jiyue Duan ◽  
Bin Lin ◽  
Qiang Yang ◽  
Yujia Luan
Keyword(s):  
Ultrasonic Machining ◽  
Rotary Ultrasonic Machining ◽  
Rotary Transformer ◽  
Design And Testing

Modeling Analysis of Contactless Power Transfer System for Rotary Ultrasonic Machining

2016 ◽  
Vol 829 ◽  
pp. 35-40 ◽  
Author(s):  
Xin Wei Wang ◽  
Ai Min Wang ◽  
Xiao Long Wang
Keyword(s):  
High Speed ◽  
Transfer System ◽  
Ultrasonic Machining ◽  
Power Transfer ◽  
Rotary Ultrasonic Machining ◽  
Loosely Coupled ◽  
Rotary Transformer ◽  
Slip Ring ◽  
Transfer Method ◽  
Contactless Power Transfer

In rotary ultrasonic machining (RUM), the traditional power transfer method was achieved by slip ring that cannot cope with high-speed rotary of the tool, which limits the machine potential of RUM. Based on the principle of electromagnetic mutual inductance and the technology of loosely coupled inductively power transfer (LCIPT), a contactless power transfer system (rotary transformer) is built for RUM to achieve its power transfer goal. Resonant Compensation technology is used to enhance the efficiency of the rotary transformer. And the performance of the rotary transformer is validated on Maxwell platform.

Optimal Design of an Ultrasonic Transducer in Rotary Ultrasonic Machining

2012 ◽  
Vol 184-185 ◽  
pp. 352-355 ◽  
Author(s):  
Fan Chong Zeng ◽  
Xiang Hui Zhang
Keyword(s):  
Resonance Frequency ◽  
Ultrasonic Transducer ◽  
Superior Performance ◽  
Response Analysis ◽  
Ultrasonic Machining ◽  
Performance Parameters ◽  
Rotary Ultrasonic Machining ◽  
Harmonic Response ◽  
Vibration Model ◽  
Harmonic Response Analysis

In this paper, an ultrasonic transducer is designed and optimized in order to reduce the error of resonance frequency and maximize the amplitude of the radiating tip. In order to get the basic dimensions of an ultrasonic transducer easily, resonance frequency equations are derived by using the traditional analytic method. Using ANSYS FEM software, we analyzed the vibration model of the transducer, including Modal Analysis and Harmonic Response Analysis. Studied how the length of two resonance rods affects the resonance frequency. By optimizing the dimensions of the ultrasonic transducer, the error of resonance frequency is reduced to 0.03%; the amplitude of the vibrating tip is up to 6.20μm. The optimal results show that the transducer designed in this paper has superior performance parameters and meets the requirements of machining.

Analysis of Wireless Energy Transmission Characteristics via Magnetic Resonances Based on Mutual Inductance Model

2014 ◽  
Vol 513-517 ◽  
pp. 3489-3495
Author(s):  
Zhi Qiang Zhao ◽  
Yong Hui Chen ◽  
Min Jie Fu ◽  
Chun Lan He ◽  
Jian Jun He ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Circuit Simulation ◽  
Magnetic Coupling ◽  
Transmission Efficiency ◽  
Mutual Inductance ◽  
Energy Transmission ◽  
Theoretical Derivation ◽  
Received Power ◽  
Coil Structure ◽  
Magnetic Resonances

The analysis of magnetic coupling resonance based on Mode Coupling theory is often complicated and abstract. Moreover, this theory is inconvenient when it comes to designing the circuits. Based on the mutual inductance in the circuit, we completed theoretical derivation, parameters calculation and circuit simulation for each of the two-coil and the four-coil structure. The received power and the transmission efficiency under different conditions are analyzed and compared. Experimental results show that too high or too low resonant frequency will affect the efficiency of transmission and reception of energy in the two-coil structure, a problem of optimal distance for energy transmission is existed in four-coil structure, the resonant frequency of the system will also affect the distance.

scholarly journals Modeling and analysis of a hybrid boost DC-DC converter for distributed generation

2018 ◽  
Vol 7 (1.8) ◽  
pp. 86
Author(s):  
M V.Sudarsan ◽  
Ch Saibabu ◽  
S Satyanarayana
Keyword(s):  
Distributed Generation ◽  
High Efficiency ◽  
Voltage Drop ◽  
Dynamic Performance ◽  
Input Voltage ◽  
High Gain ◽  
Transmission Efficiency ◽  
Boost Converter ◽  
Duty Ratio ◽  
Voltage Profile

As the power generating stations are located very far from the load centers, there is a necessity to transmit the power through the long transmission lines. The transmission efficiency and voltage profile are poor, due to the large amount of line losses and voltage drop. Thus to improve its performance, the generation of the power has to be done at the vicinity of load centers and is possible through the distributed generation (DG). The DG system consists of a boost converter which increases the dc input voltage obtained from an array of PV cells arranged on the solar panels.In this paper, the hybrid boost converter which is a high gain step-up dc-dc converter is modeled and analyzed for DG applications. The gain of this hybrid converter is D (duty ratio) times more than the normal boost converter and posses the advantages like less ripple current and high efficiency. Also the dynamic performance of the converters is compared in both open and closed loops from the simulation work carried out in MATLAB / Simulink environment.

Improving the efficiency of oilfield electric power distribution

2019 ◽  
pp. 79-87
Author(s):  
Yu. F. Yu. F. Romaniuk ◽  
О. V. Solomchak ◽  
М. V. Hlozhyk
Keyword(s):  
Power Distribution ◽  
Reactive Power ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Active Power ◽  
Oil Field ◽  
Total Power ◽  
Simultaneous Increase ◽  
Active Load ◽  
Step Down

The issues of increasing the efficiency of electricity transmission to consumers with different nature of their load are considered. The dependence of the efficiency of the electric network of the oil field, consisting of a power line and a step-down transformer, on the total load power at various ratios between the active and reactive components of the power is analyzed, and the conditions under which the maximum transmission efficiency can be ensured are determined. It is shown by examples that the power transmission efficiency depends not only on the active load, but also largely on its reactive load. In the presence of a constant reactive load and an increase in active load, the total power increases and the power transmission efficiency decreases. In the low-load mode, the schedule for changing the power transmission efficiency approaches a parabolic form, since the influence of the active load on the amount of active power loss decreases, and their value will mainly depend on reactive load, which remains unchanged. The efficiency reaches its maximum value provided that the active and reactive components of the power are equal. In the case of a different ratio between them, the efficiency decreases. With a simultaneous increase in active and reactive loads and a constant value of the power factor, the power transmission efficiency is significantly reduced due to an increase in losses. With a constant active load and an increase in reactive load, efficiency of power transmission decreases, since with an increase in reactive load, losses of active power increase, while the active power remains unchanged. The second condition, under which the line efficiency will be maximum, is full compensation of reactive power.  Therefore, in order to increase the efficiency of power transmission, it is necessary to compensate for the reactive load, which can reduce the loss of electricity and the cost of its payment and improve the quality of electricity. Other methods are also proposed to increase the efficiency of power transmission by regulating the voltage level in the power center, reducing the equivalent resistance of the line wires, optimizing the loading of the transformers of the step-down substations and ensuring the economic modes of their operation.

scholarly journals Dual-Band RF Wireless Power Transfer System with a Shared-Aperture Dual-Band Tx Array Antenna

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3803
Author(s):  
Chan-Mi Song ◽  
Hong-Jun Lim ◽  
Son Trinh-Van ◽  
Kang-Yoon Lee ◽  
Youngoo Yang ◽  
...  
Keyword(s):  
Wireless Power Transfer ◽  
Transmission Efficiency ◽  
Array Antenna ◽  
Dual Band ◽  
Single Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Beam Focusing ◽  
Received Power ◽  
Rf Wireless

In this paper, a dual-band RF wireless power transfer (WPT) system with a shared-aperture dual-band Tx array antenna for 2.4 and 5.8 GHz is proposed. The final configuration of the Tx array, which is made up of 2.4 GHz right-handed circular polarization (RHCP) patches and 5.8 GHz RHCP patches, is derived from the optimization of 2.4 and 5.8 GHz thinned arrays, ultimately to achieve high transmission efficiency for various WPT scenarios. The dual-band RF WPT Tx system including the Tx array antenna and a Tx module is implemented, and Rx antennas with a 2.4 GHz patch, a 5.8 GHz patch, and a dual-band (2.4 and 5.8 GHz) patch are developed. To validate the proposed dual-band RF WPT system, WPT experiments using a single band and dual bands were conducted. When transmitting RF wireless power on a single frequency (either 2.482 GHz or 5.73 GHz), the received power according to the distance between the Tx and Rx and the position of the Rx was measured. When the distance was varied from 1 m to 3.9 m and the transmitted power was 40 dBm, the received power value at 2.482 GHz and 5.73 GHz were measured and found to be 24.75–13.5 dBm (WPT efficiency = 2.985–0.224%) and 19.25–6.8 dBm (WPT efficiency = 0.841–0.050%), respectively. The measured results were in good agreement with the calculated results, and it is revealed that the transmission efficiency when wireless power is transmitted via beam-focusing increases more than that with conventional beam-forming. Furthermore, the dual-band WPT experiment proves that 2.482 GHz beam and 5.73 GHz beams can be formed individually and that their wireless power can be transmitted to a dual-band Rx or two different Rx.

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