In this study, we major discuss a multiple composite piezoelectric motor. It is made by the base, the multiple composite piezoelectric stator and the preload adjusting module. The multiple composite piezoelectric stat...In this study, we major discuss a multiple composite piezoelectric motor. It is made by the base, the multiple composite piezoelectric stator and the preload adjusting module. The multiple composite piezoelectric stator is composed of the base, the first actuating element, the second actuating element and stator. The first actuating element is composed of the longitudinal and the first bending vibration modules, in which the first bending vibration module includes the horizontal and vertical bending vibration modules. And the second actuating element or bending vibration modules, wherein the second actuating element also includes the horizontal and vertical bending vibration modules. In addition, the preload adjusting module includes the limiting element, spring, washer and nut. In order to obtain the best vibration modes of the multiple composite piezoelectric motor, we use the ANSYS code to simulate. And so as to get the better performance and efficiency relate to the previous similar type’s motor under the same driving conditions, we try to use different vibration modules or modes to drive the multiple composite piezoelectric motor, including the longitudinal, the first bending, the second bending and the multiple vibration modules or modes by experiments. According to the results of the simulations and experiments, we found that the multiple composite piezoelectric motor has better rotational speed, loading ability and conversion efficiency of direction relate to the previous similar type’s motor. Where the maximum rotational speed multiple composite piezoelectric motor is up to 600 rpm under conditions of 180 Vp-p driving voltage, 37.8 kHz driving frequency, 00 driving phase angle and 12.1 gw loading. And the maximum loading ability is 2500 gw under conditions of 180 Vp-p driving voltage, 37.8 kHz driving frequency, 00 driving phase angle and 6rpm rotational speed.展开更多
针对多芯片功率模块MCPMs(multi-chip power modules)从功率模块布局设计角度对碳化硅SiC(sili-con carbide)MOSFET的并联不均流进行了研究。理论分析了造成SiC MOSFET并联不均流的原因,在忽略器件自身差异的情况下,重点分析了非对称布...针对多芯片功率模块MCPMs(multi-chip power modules)从功率模块布局设计角度对碳化硅SiC(sili-con carbide)MOSFET的并联不均流进行了研究。理论分析了造成SiC MOSFET并联不均流的原因,在忽略器件自身差异的情况下,重点分析了非对称布局对功率管并联不均流的影响。在此基础之上,以集成化大功率固态功率控制器SSPC(solid-state power controller)为背景,提出了3种适用于大功率SSPC集成功率模块的非对称布局,分别对3种布局的不均流电流进行了理论分析,并利用Ansoft Q3D提取寄生参数在Saber中对模块的动态开关过程进行仿真。仿真结果表明,通过合理的布局可以减小非对称布局引起的寄生电感不对称对SiCMOSFET并联不均流造成的影响。展开更多
文摘In this study, we major discuss a multiple composite piezoelectric motor. It is made by the base, the multiple composite piezoelectric stator and the preload adjusting module. The multiple composite piezoelectric stator is composed of the base, the first actuating element, the second actuating element and stator. The first actuating element is composed of the longitudinal and the first bending vibration modules, in which the first bending vibration module includes the horizontal and vertical bending vibration modules. And the second actuating element or bending vibration modules, wherein the second actuating element also includes the horizontal and vertical bending vibration modules. In addition, the preload adjusting module includes the limiting element, spring, washer and nut. In order to obtain the best vibration modes of the multiple composite piezoelectric motor, we use the ANSYS code to simulate. And so as to get the better performance and efficiency relate to the previous similar type’s motor under the same driving conditions, we try to use different vibration modules or modes to drive the multiple composite piezoelectric motor, including the longitudinal, the first bending, the second bending and the multiple vibration modules or modes by experiments. According to the results of the simulations and experiments, we found that the multiple composite piezoelectric motor has better rotational speed, loading ability and conversion efficiency of direction relate to the previous similar type’s motor. Where the maximum rotational speed multiple composite piezoelectric motor is up to 600 rpm under conditions of 180 Vp-p driving voltage, 37.8 kHz driving frequency, 00 driving phase angle and 12.1 gw loading. And the maximum loading ability is 2500 gw under conditions of 180 Vp-p driving voltage, 37.8 kHz driving frequency, 00 driving phase angle and 6rpm rotational speed.
文摘针对多芯片功率模块MCPMs(multi-chip power modules)从功率模块布局设计角度对碳化硅SiC(sili-con carbide)MOSFET的并联不均流进行了研究。理论分析了造成SiC MOSFET并联不均流的原因,在忽略器件自身差异的情况下,重点分析了非对称布局对功率管并联不均流的影响。在此基础之上,以集成化大功率固态功率控制器SSPC(solid-state power controller)为背景,提出了3种适用于大功率SSPC集成功率模块的非对称布局,分别对3种布局的不均流电流进行了理论分析,并利用Ansoft Q3D提取寄生参数在Saber中对模块的动态开关过程进行仿真。仿真结果表明,通过合理的布局可以减小非对称布局引起的寄生电感不对称对SiCMOSFET并联不均流造成的影响。
