非接触电能传输(Contactless Power Transfer,CPT)系统在工作过程中会出现频率分裂现象。论文以串联补偿的CPT系统为研究对象对系统进行建模分析,推导出了CPT系统中重要参数的方程表达式并选择负载电压作为重点研究对象。数值分析和实...非接触电能传输(Contactless Power Transfer,CPT)系统在工作过程中会出现频率分裂现象。论文以串联补偿的CPT系统为研究对象对系统进行建模分析,推导出了CPT系统中重要参数的方程表达式并选择负载电压作为重点研究对象。数值分析和实验结果表明,负载电压和负载功率在过耦合区内(k>kcritical)会分裂出两道脊,CPT系统工作在谐振频率(f0)和关键点(kcritical)时可以获得最大的负载电压和负载功率。展开更多
基于感应耦合电能传输(inductively coupled power transfer,ICPT)的非接触式牵引供电系统可以非接触供电方式为列车提供实时牵引电能,是轨道交通领域未来新型牵引供电技术的重要发展方向。首先,阐述了轨道交通实时受流非接触式牵引供...基于感应耦合电能传输(inductively coupled power transfer,ICPT)的非接触式牵引供电系统可以非接触供电方式为列车提供实时牵引电能,是轨道交通领域未来新型牵引供电技术的重要发展方向。首先,阐述了轨道交通实时受流非接触式牵引供电系统的结构和特点,回顾了ICPT技术和轨道交通非接触式牵引供电系统的国内外研究现状。然后,详细分析了基于ICPT的非接触式牵引供电主要关键技术研究成果和存在的问题。最后,结合研究现状对轨道交通非接触式牵引供电系统研究进行了展望。展开更多
设计并实现了一种基于松耦合变压器小功率CPT(Contactless Power Transfer)系统。采用互感模型对松耦合变压器进行了分析,对其原边和副边进行了补偿。采用有芯PCB螺旋电感线圈来制作松耦合变压器的原边和副边绕组,给出了有芯电感的几何...设计并实现了一种基于松耦合变压器小功率CPT(Contactless Power Transfer)系统。采用互感模型对松耦合变压器进行了分析,对其原边和副边进行了补偿。采用有芯PCB螺旋电感线圈来制作松耦合变压器的原边和副边绕组,给出了有芯电感的几何参数和物理参数。原边、副边之间通过高频方波传递能量。最后给出了整个系统的电路图。测试结果表明,当原边和副边距离在5mm以内时,电能传输效率较高,可为手机等小功率用电设备充电。展开更多
This paper presents a modelling and parameter identification of through-hole type contactless slipring systems for transferring electrical power for wind turbine pitch control. An equivalent circuit model has been dev...This paper presents a modelling and parameter identification of through-hole type contactless slipring systems for transferring electrical power for wind turbine pitch control. An equivalent circuit model has been developed from the physical structure and dimensions of the contactless slipring using the duality rules, which is very different form traditional transformer. The circuit inductances are determined by the derived expressions from the system reluctances. In particular, the equivalent resistance representing the core loss of the slipring has been determined using phasor diagram of exciting current. FEM (Finite Element Method) models and practical prototypes are developed for testing and verifycations. Both simulation and experimental results have shown that the developed model gives truthful values for numerical calculations in order to obtain the equivalent electric circuit. The effect of fringing flux around the air gap on mutual inductance and the ways of correcting its effects are analysed. The obtained values have shown that the developed models and derived equations are with high accuracy as compared to the FEM simulation and experimental results.展开更多
The giant magnetostrictive rotary ultrasonic processing system(GMUPS)with a loosely-coupled contactless power transfer(LCCPT)has emerged as a high-performance technique for the processing of hard and brittle materials...The giant magnetostrictive rotary ultrasonic processing system(GMUPS)with a loosely-coupled contactless power transfer(LCCPT)has emerged as a high-performance technique for the processing of hard and brittle materials,owing to its high power density.A capacitive compensation is required to achieve the highest energy efficiency of GMUPS to provide sufficient vibration amplitude when it works in the resonance state.In this study,an accurate model of the optimal compensation capacitance is derived from a new electromechanical equivalent circuit model of the GMUPS with LCCPT,which consists of an equivalent mechanical circuit and an electrical circuit.The phase lag angle between the mechanical and electrical circuits is established,taking into account the non-negligible loss in energy conversion of giant magnetostrictive material at ultrasonic frequency.The change of system impedance characteristics and the effectiveness of the system compensation method under load are analyzed.Both idle vibration experiments and machining tests are conducted to verify the developed model.The results show that the GMUPS with optimal compensation capacitance can achieve the maximum idle vibration amplitude and smallest cutting force.In addition,the effects of magnetic conductive material and driving voltages on the phase lag angle are also evaluated.展开更多
文摘非接触电能传输(Contactless Power Transfer,CPT)系统在工作过程中会出现频率分裂现象。论文以串联补偿的CPT系统为研究对象对系统进行建模分析,推导出了CPT系统中重要参数的方程表达式并选择负载电压作为重点研究对象。数值分析和实验结果表明,负载电压和负载功率在过耦合区内(k>kcritical)会分裂出两道脊,CPT系统工作在谐振频率(f0)和关键点(kcritical)时可以获得最大的负载电压和负载功率。
文摘基于感应耦合电能传输(inductively coupled power transfer,ICPT)的非接触式牵引供电系统可以非接触供电方式为列车提供实时牵引电能,是轨道交通领域未来新型牵引供电技术的重要发展方向。首先,阐述了轨道交通实时受流非接触式牵引供电系统的结构和特点,回顾了ICPT技术和轨道交通非接触式牵引供电系统的国内外研究现状。然后,详细分析了基于ICPT的非接触式牵引供电主要关键技术研究成果和存在的问题。最后,结合研究现状对轨道交通非接触式牵引供电系统研究进行了展望。
文摘设计并实现了一种基于松耦合变压器小功率CPT(Contactless Power Transfer)系统。采用互感模型对松耦合变压器进行了分析,对其原边和副边进行了补偿。采用有芯PCB螺旋电感线圈来制作松耦合变压器的原边和副边绕组,给出了有芯电感的几何参数和物理参数。原边、副边之间通过高频方波传递能量。最后给出了整个系统的电路图。测试结果表明,当原边和副边距离在5mm以内时,电能传输效率较高,可为手机等小功率用电设备充电。
文摘This paper presents a modelling and parameter identification of through-hole type contactless slipring systems for transferring electrical power for wind turbine pitch control. An equivalent circuit model has been developed from the physical structure and dimensions of the contactless slipring using the duality rules, which is very different form traditional transformer. The circuit inductances are determined by the derived expressions from the system reluctances. In particular, the equivalent resistance representing the core loss of the slipring has been determined using phasor diagram of exciting current. FEM (Finite Element Method) models and practical prototypes are developed for testing and verifycations. Both simulation and experimental results have shown that the developed model gives truthful values for numerical calculations in order to obtain the equivalent electric circuit. The effect of fringing flux around the air gap on mutual inductance and the ways of correcting its effects are analysed. The obtained values have shown that the developed models and derived equations are with high accuracy as compared to the FEM simulation and experimental results.
基金supported by the National Natural Science Foundation of China(Nos.51875311 and 52105458)the Tsinghua-Foshan Innovation Special Fund(No.2021THFS0204)the Huaneng Group Science and Technology Research Project(No.HNKJ22-U22YYJC08),China。
文摘The giant magnetostrictive rotary ultrasonic processing system(GMUPS)with a loosely-coupled contactless power transfer(LCCPT)has emerged as a high-performance technique for the processing of hard and brittle materials,owing to its high power density.A capacitive compensation is required to achieve the highest energy efficiency of GMUPS to provide sufficient vibration amplitude when it works in the resonance state.In this study,an accurate model of the optimal compensation capacitance is derived from a new electromechanical equivalent circuit model of the GMUPS with LCCPT,which consists of an equivalent mechanical circuit and an electrical circuit.The phase lag angle between the mechanical and electrical circuits is established,taking into account the non-negligible loss in energy conversion of giant magnetostrictive material at ultrasonic frequency.The change of system impedance characteristics and the effectiveness of the system compensation method under load are analyzed.Both idle vibration experiments and machining tests are conducted to verify the developed model.The results show that the GMUPS with optimal compensation capacitance can achieve the maximum idle vibration amplitude and smallest cutting force.In addition,the effects of magnetic conductive material and driving voltages on the phase lag angle are also evaluated.
