Primarily describes the structure and communication principle of the systems master station and follow station, and the Data Base Managements fuction module.

主要论述了系统主站和从站的结构和通讯原理以及数据库管理系统的功能模块。

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This paper mainly discusses a PWM control system for switched resistant motor (SRM) driving system and the base structure and working principle of SRM are introduced.

介绍了三相开关磁阻电动机脉宽调制（PWM）控制系统及开关磁阻电动机（SRM）的基本结构与工作原理。

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This paper introduces the structure and principle, elaborates common fault causes and points out the measures for prevention of fault, which lies the base for prevention and repairing of gear pump.

介绍了齿轮油泵的结构原理，阐述了其常见故障的原因，并指出了预防故障的措施，为预防故障及修理油泵打下良好基础。

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