High-performance control of permanent magnet synchronous motors(PMSMs)necessitates precise rotor-position feedback.However,conventional solutions,including optical encoders,resolvers,and external magnetic encoders,suf...High-performance control of permanent magnet synchronous motors(PMSMs)necessitates precise rotor-position feedback.However,conventional solutions,including optical encoders,resolvers,and external magnetic encoders,suffer from excessive axial space occupation,structural complexity,and compromised output performance.Hence,embedded magnetic encoders(EMEs)have emerged as compact and cost-effective alternatives that leverage linear Hall sensors to extract rotor angle information from internal magnetic fields.The technological evolution of EMEs in three critical dimensions are comprehensively reviewed:①Hall sensor configurations and signal acquisition methodologies across diverse motor topologies,②disturbance mechanisms and error propagation characteristics under non-ideal operational conditions,and③advanced harmonic suppression techniques and angle-decoding algorithms.Finally,the shortcomings and urgent challenges in current technological development are summarized and valuable research priorities for future studies are identified.展开更多
SQL Server Mobile为移动设备和嵌入式设备提供了一个压缩的数据库解决方案。通过使用Microsoft VisualStudio工具,开发者可以将SQL Server的数据库管理能力扩展到移动设备上。介绍了在基于WINCE的移动设备上开发SQL Server Mobile数据...SQL Server Mobile为移动设备和嵌入式设备提供了一个压缩的数据库解决方案。通过使用Microsoft VisualStudio工具,开发者可以将SQL Server的数据库管理能力扩展到移动设备上。介绍了在基于WINCE的移动设备上开发SQL Server Mobile数据库的方法。并结合多媒体词典数据库的开发,详细分析了在系统开发中涉及的几项关键技术,对于嵌入式移动数据库的开发具有一定的参考价值。展开更多
基金Supported by the National Natural Science Foundation of China(524B2097)SEU Innovation Capability Enhancement Plan for Doctoral Students.
文摘High-performance control of permanent magnet synchronous motors(PMSMs)necessitates precise rotor-position feedback.However,conventional solutions,including optical encoders,resolvers,and external magnetic encoders,suffer from excessive axial space occupation,structural complexity,and compromised output performance.Hence,embedded magnetic encoders(EMEs)have emerged as compact and cost-effective alternatives that leverage linear Hall sensors to extract rotor angle information from internal magnetic fields.The technological evolution of EMEs in three critical dimensions are comprehensively reviewed:①Hall sensor configurations and signal acquisition methodologies across diverse motor topologies,②disturbance mechanisms and error propagation characteristics under non-ideal operational conditions,and③advanced harmonic suppression techniques and angle-decoding algorithms.Finally,the shortcomings and urgent challenges in current technological development are summarized and valuable research priorities for future studies are identified.
文摘SQL Server Mobile为移动设备和嵌入式设备提供了一个压缩的数据库解决方案。通过使用Microsoft VisualStudio工具,开发者可以将SQL Server的数据库管理能力扩展到移动设备上。介绍了在基于WINCE的移动设备上开发SQL Server Mobile数据库的方法。并结合多媒体词典数据库的开发,详细分析了在系统开发中涉及的几项关键技术,对于嵌入式移动数据库的开发具有一定的参考价值。
