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反应式步进电机单电压驱动方式的改进设计 被引量:1
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作者 张敏 辛鹏 《科技创新导报》 2008年第35期63-63,共1页
传统的反应式步进电机单电压驱动方式电源效率低、运转噪音大,仅适用于小功率步进电机。针对单电压驱动存在的问题,从分析反应式步进电动机绕组中的电流入手,提出了基于单电压驱动方式的改进方案。该方案通过改变单电压驱动的通电方式,... 传统的反应式步进电机单电压驱动方式电源效率低、运转噪音大,仅适用于小功率步进电机。针对单电压驱动存在的问题,从分析反应式步进电动机绕组中的电流入手,提出了基于单电压驱动方式的改进方案。该方案通过改变单电压驱动的通电方式,有效提高电源的使用效率,降低电机运转噪音。实际使用效果表明,此方法切实有效。 展开更多
关键词 步进电动机 电压驱动 反应式
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一种新型RF MEMS单刀双掷开关的设计与仿真
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作者 苟元潇 吴群 +1 位作者 靳炉魁 陈鹏 《微波学报》 CSCD 北大核心 2010年第S1期345-348,共4页
本文介绍了一种利用单驱动电压控制通路选择的新型RFMEMS单刀双掷开关,利用三维仿真软件Ansoft HFSS和ANSYS进行仿真和优化设计该开关的性能。仿真结果表明:驱动电压为22V,开关时间为22μs,在中心频率30GHz处,开关处于down状态下的插入... 本文介绍了一种利用单驱动电压控制通路选择的新型RFMEMS单刀双掷开关,利用三维仿真软件Ansoft HFSS和ANSYS进行仿真和优化设计该开关的性能。仿真结果表明:驱动电压为22V,开关时间为22μs,在中心频率30GHz处,开关处于down状态下的插入损耗为0.42dB,回波损耗为43dB,隔离度为29dB;而当开关处于up状态的插入损耗为0.53dB,回波损耗为19dB,隔离度为28dB,该开关的性能仿真和优化设计达到理想情况。。 展开更多
关键词 RFMEMS 刀双掷开关 单驱动电压 插入损耗 回波损耗 隔离度
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Monolithic piezoceramic actuators with a twist
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作者 Jikun Yang Faqiang Zhang +2 位作者 Yongxiang Li Zhifu Liu Shuxiang Dong 《Science China Materials》 SCIE EI CAS CSCD 2021年第11期2777-2785,共9页
Designing artificial structures with heterogeneous elements and manipulating their interface coupling ways usually bring in synthetic neo-nature to functional devices.For piezoceramic devices,the deformation response ... Designing artificial structures with heterogeneous elements and manipulating their interface coupling ways usually bring in synthetic neo-nature to functional devices.For piezoceramic devices,the deformation response refers to a variety of extensional,contractional,or shear modes of crystals,and also relies on boundary conditions from morphology design.However,to pursue fundamental torsion actuation in an integrated piezoceramic component is still a long-term tough task due to nil twist mode limited by microscopic crystal mirror symmetry.Herein,we demonstrate a design of cofired monolithic actuators to originally overcome this obstacle.The prototype device is composed of two sets of stacked actuation subunits that work on artificially reverse face shear modes,and their chiral stiffness couplings will synergistically contribute to synthetic twist outputs at a broad bandwidth.Finite element simulation reveals twist displacements are highly tunable by manipulating the geometrical dimensions.Transverse deflection measurements manifest the stable and sizeable linear actuation response to applied electric fields(around 3.7μm under 40 V at 1 Hz).Importantly,the design actually introduces a more general route to enable arbitrary modes and actuation states in integrated piezoceramic components. 展开更多
关键词 integrated piezoelectric devices twist mode cofired manufacture precision actuation ordered structure
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