This paper describes a small wind turbine generation system with SynRG （synchronous reluctance generator）. SynRGs are robust and inexpensive. In addition, SynRG has no cogging torque. Hence, wind turbine generation ...This paper describes a small wind turbine generation system with SynRG （synchronous reluctance generator）. SynRGs are robust and inexpensive. In addition, SynRG has no cogging torque. Hence, wind turbine generation system with SynRG can achieve smooth start at low wind velocity. The rotor design of proposed SynRG is multi flux barrier type. With FEA （finite element analysis） software, the characteristics of SynRG are brought out, and the performance of wind turbine generation system with SynRG including copper loss and iron loss is simulated by FEA coupled with the motion equation of the wind turbine generation system under the maximum power point tracking control. In this paper, the constant wind test and the quasi-natural wind test are conducted. In conclusion, the results of these simulations indicate that the wind turbine generation system with SynRG has good performance, especially in starting phenomena.展开更多
Optical whispering-gallery-mode microresonators with ultrahigh quality factors and small mode volumes have played an important role in modern physics.They have been demonstrated as a diverse platform for a wide range ...Optical whispering-gallery-mode microresonators with ultrahigh quality factors and small mode volumes have played an important role in modern physics.They have been demonstrated as a diverse platform for a wide range of applications in photonics,such as nonlinear optics,optomechanics,quantum optics,and information processing.Thermal behaviors induced by power build-up in the resonators or environmental perturbations are ubiquitous in high-quality-factor whispering-gallery-mode resonators and have played an important role in their operation for various applications.In this review,we discuss the mechanisms of laser-field-induced thermal nonlinear effects,including thermal bistability and thermal oscillation.With the help of the thermal bistability effect,optothermal spectroscopy and optical nonreciprocity have been demonstrated.By tuning the temperature of the environment,the resonant mode frequency will shift,which can also be used for thermal sensing/tuning applications.The thermal locking technique and thermal imaging mechanisms are discussed briefly.Finally,we review some techniques employed to achieve thermal stability in a high-quality-factor resonator system.展开更多
文摘This paper describes a small wind turbine generation system with SynRG （synchronous reluctance generator）. SynRGs are robust and inexpensive. In addition, SynRG has no cogging torque. Hence, wind turbine generation system with SynRG can achieve smooth start at low wind velocity. The rotor design of proposed SynRG is multi flux barrier type. With FEA （finite element analysis） software, the characteristics of SynRG are brought out, and the performance of wind turbine generation system with SynRG including copper loss and iron loss is simulated by FEA coupled with the motion equation of the wind turbine generation system under the maximum power point tracking control. In this paper, the constant wind test and the quasi-natural wind test are conducted. In conclusion, the results of these simulations indicate that the wind turbine generation system with SynRG has good performance, especially in starting phenomena.
基金supported by NSF grant nos.EFMA1641109 and ECCS1711451 and ARO grant no.W911NF1710189.
文摘Optical whispering-gallery-mode microresonators with ultrahigh quality factors and small mode volumes have played an important role in modern physics.They have been demonstrated as a diverse platform for a wide range of applications in photonics,such as nonlinear optics,optomechanics,quantum optics,and information processing.Thermal behaviors induced by power build-up in the resonators or environmental perturbations are ubiquitous in high-quality-factor whispering-gallery-mode resonators and have played an important role in their operation for various applications.In this review,we discuss the mechanisms of laser-field-induced thermal nonlinear effects,including thermal bistability and thermal oscillation.With the help of the thermal bistability effect,optothermal spectroscopy and optical nonreciprocity have been demonstrated.By tuning the temperature of the environment,the resonant mode frequency will shift,which can also be used for thermal sensing/tuning applications.The thermal locking technique and thermal imaging mechanisms are discussed briefly.Finally,we review some techniques employed to achieve thermal stability in a high-quality-factor resonator system.
