1、 1 摘 要 串级调速系统是在转子回路中串入附加电动势, 以改变 转差率来实现调速。 串入附加电动势而增加的转差功率, 回 馈给电网或者回馈到电动机轴上使系统有较高的运行效率。 它能实现无级平滑调速, 低速时机械特性也比较硬。 特别是 晶闸管低同步串级调速系统,技术难度小,性能比较完善。 本设计介绍了一种双闭环控制的串级调速系统, 对系统 的工作原理、 组成及动态结构作了较为详细的论述, 分析了 交流串级调速系统工作时的主要特征, 并据此对其与正常接 线或转子回路串电阻调速时的效率做了一般性的定性分析 和比较。 针对传统串级调速系统总功率因素低这一主要缺点. 分析了一种转子侧加短路开关的串级调
2、速系 。 转子侧加短 路开关的串级调速系统因能充分利用电机自然工作状态功 率因数高的特性, 在带恒转矩负载时功率因数有一定程度的 提高分析了一种转子侧加短路开关的串级调速系 。 本设计报告首先根据设计要求确定调速方案和主电路 的结构型式, 主电路和闭环系统确定下来后, 对电路各元件 参数的计算和器件选型,包括整流变压器、整流元件、平波 电抗器、 保护电路以及电流和转速调节器参数计算, 从而达 到设计要求。 关键词:串级调速 ;闭环控制;功率因数;整流电路 ; 逆变 2 Abstract The cascade velocity modulation system is the string e
3、nters the additional EMF in the rotor return route, changes the sliding to realize the velocity modulation.The string enters slips the power which the additional EMF increases, the back coupling for the electrical network or the back coupling to the electrically operated engine shaft on enable the s
4、ystem to have the high operating efficiency. It can realize the stepless smooth velocity modulation, when the low speed the physical characteristics quite is also hard. The thyristor low synchronization cascade velocity modulation system, the technical difficulty is specially small, the performance
5、quite is perfect. This design introduced one kind of double closed-loop control cascade velocity modulation system, to the system principle of work, the composition and the dynamic structure has made a more detailed elaboration, has analyzed time the exchange cascade velocity modulation system work
6、main characteristic, according to the above and has made the general qualitative analysis to it with the normal wiring or time the rotor return route string resistance velocity modulation efficiency and compares. Lowers 3 this main shortcoming in view of the traditional cascade velocity modulation system total output factor, analyzed one kind of rotor side to add the shorting contact switch the cascade governing system. Because the rotor side adds the shorting contact swi