The plasma current is modulated with an alternating current (ac) component in a frequency range of 90 Hz - 900 Hz in the plateau discharge phase in the CT-6B tokamak. A plasma electric conductivity profile in a form...The plasma current is modulated with an alternating current (ac) component in a frequency range of 90 Hz - 900 Hz in the plateau discharge phase in the CT-6B tokamak. A plasma electric conductivity profile in a form of (1 - r^2/a^2)^α with a parameter α which is fitted with the experimental data, can be determined. The effects of magnetic shear in a tokamak field configuration on the current penetration are taken into account in the numerical simulation. The measurement method and obtained results are discussed.展开更多
家用及商用空调智能功率模块(Intelligent Power Module,IPM)-FO功能保护直接决定了驱动电机乃至整个系统的稳定运行,而智能功率模块出现FO保护可能是由于印刷电路板(Printed Circuit Board,PCB)布局不合理、驱动控制器存在的强弱电干...家用及商用空调智能功率模块(Intelligent Power Module,IPM)-FO功能保护直接决定了驱动电机乃至整个系统的稳定运行,而智能功率模块出现FO保护可能是由于印刷电路板(Printed Circuit Board,PCB)布局不合理、驱动控制器存在的强弱电干扰、热地冷地之间的波动、开关电源变压器开关动作干扰、电子膨胀阀动作导致地线扰动影响电机电流采样等诸多因素。因此,驱动板FO出现保护时首先需要从IPM-FO模块保护机理出发,采用试验排除法逐步确认故障点。采用所提试验技术方法逐步排查直至整机正常运行,通过整改前后波形对比,进一步证明采用该方法能有效解决专用智能功率模块出现的FO问题,对空调行业售后技术服务人员有一定的的借签及指导意义。展开更多
基金The project supported by the National Natural Science Foundation of China (Nos. 19789502 and 19889506)
文摘The plasma current is modulated with an alternating current (ac) component in a frequency range of 90 Hz - 900 Hz in the plateau discharge phase in the CT-6B tokamak. A plasma electric conductivity profile in a form of (1 - r^2/a^2)^α with a parameter α which is fitted with the experimental data, can be determined. The effects of magnetic shear in a tokamak field configuration on the current penetration are taken into account in the numerical simulation. The measurement method and obtained results are discussed.
文摘家用及商用空调智能功率模块(Intelligent Power Module,IPM)-FO功能保护直接决定了驱动电机乃至整个系统的稳定运行,而智能功率模块出现FO保护可能是由于印刷电路板(Printed Circuit Board,PCB)布局不合理、驱动控制器存在的强弱电干扰、热地冷地之间的波动、开关电源变压器开关动作干扰、电子膨胀阀动作导致地线扰动影响电机电流采样等诸多因素。因此,驱动板FO出现保护时首先需要从IPM-FO模块保护机理出发,采用试验排除法逐步确认故障点。采用所提试验技术方法逐步排查直至整机正常运行,通过整改前后波形对比,进一步证明采用该方法能有效解决专用智能功率模块出现的FO问题,对空调行业售后技术服务人员有一定的的借签及指导意义。