It can be seen from experimental results , that the bldcm control system reaches all the qualities required by the drill motor . the motor starts fast and operates stably in a very small torque ripple 从样机的测试结果来看，电机起动稳定快速、转矩脉动小，并具有很宽的闭环调速范围，完全满足牙钻电机各项性能指标要求。
Through testing , this system reached the requests of improving the performance of ac motor start , it can start steadily and reliably under the condition that start - current of motor is controlled 本系统经过实验调试，基本达到了改善鼠笼电机起动性能的要求，在保障降低电机起动电流的前提下，能够满足电机的平稳可靠起动。
Firstly , when the 10kv high pressure motor start up , the rate of false action caused by automatic switch protector ( asp ) will raise dramatically ; secondly , at moment of on / off switch , great electromagnetic flux induced in the asp cause damage 一是在10kv高压电机的启动时,高爆保护器的误动作率明显提高;二是在分合闸瞬间,较大的电磁影响甚至造成了保护器的损坏。
Among the modern industrial control fields , the research of ac motor start control is an important task . ac motor soft starter , with its soft starting , small impulse current , no contacts , and energy saving , has gained widely use in electric transmission 在现代工业控制领域中，交流电动机的起动控制一直是个非常重要的研究课题，而交流电动机软起动器以其起动平稳、起动冲击电流小、无触点、节能等优势，在电气传动中得到了广泛的应用。
This control system is developed for the air _ condition compressor motor . it can be see form the result of experiment result , the motor start fast and stably with small torque ripple and wider area of speeding . it can satisfy all the requirement of air _ condition compressor motor 本控制系统是针对空调压缩机电机研制的，从试验的测试结果来看，电机起动稳定快速、起矩脉动小，具有较宽的闭环调速范围，完全满足空调压缩机电机各项性能指标要求。
Pull the slip board , up distance switch to loosen , the film motor starts turn to move after receive the signal , turning to schedule length , pass the sense switch control film electrical engineering automatically stop , put the cup into the bottom slip mold , then push to go into , next circulation beginning 拉出下模滑板，上行程开关松开，胶模电机接到信号后开始转动，转过预定长度，通过电眼控制胶膜电机自动停止，将胶杯放入下模滑板，再推入，下一个循环开始。
Firstly , contemporary research actuality for start / generator is introduced briefly . then , basic working principles and starting manners of engine in the induction motor start / generator system are done in detail . after that , the starting resisting torque characteristic of diesel engine is analyzed and several starting schemes for starting diesel engine are investigated 在简要介绍了起动发电系统的研究现状后，详细介绍了异步电机起动发电系统的发动机基本工作原理和起动方式，并对发动机的一种类型? ?柴油机的起动阻力矩特性进行了分析，并研究了几种柴油机起动方案。
The experiment consequently prove that this soft starter operates well , has the simple construction , light weight , small volume , controllable starting current and starting time , smooth starting and can reduce the current impact for motor starting . its discrete frequency control starting mode enable it to control the induction motors which drive vated load during starting 实验结果证明此软起动控制器性能良好，具有结构简单、无触点、重量轻、体积小、起动电流及起动时间可控制、起动过程平滑等优点，能有效地减小电机起动时的电流冲击。
Electronic soft starter is a kind of novel motor control device which can implement the soft - start , soft - stop and energy - saving of the asynchronous motor . compare in the traditional motor starter , it has outstanding advantages such as stepless regulation of the motor start , avoid the inrush of the torque and the current , and reliable protections , convenient operation and starting repetitively . so the paper aim at electronic soft starter , asynchronous soft starter of electrical machinery electron as research object , study it ' s high - performance soft starting technology - torque control soft - start , develop its realization circuit 异步电动机电子软起动器是一种集电机软起动、软停机、轻载节能和多种保护功能于一体的新颖电机控制装置，相比于传统的起动器，它突出的优点体现在能够连续无级的调节电机起动、冲击转矩和冲击电流小、控制简便、起动重复性好以及体积小等方面，本文以异步电机电子软起动器为研究对象，研究高性能的电机软起动技术- - -转矩起动方式，并研制其实现电路。
About the control system of dsp , the hardware and software design of the control system is dissertated in detail . the part of the hardware design first expounds the whole design . then the design of several primary circuits is discussed and choice of some important electronic components and their parameters in these circuits is analysed emphatically . the part of software design also first exprounds the whole design . next , a few primary sub routines are expatiated . at last , the “ software in place of hardware ” strategy of the whole control system is presented . after we apply the design scheme of the thesis to a bldcm , the experimental results indicate that the control system of dsp can make the motor start successfully , the time of startup is less than 3 seconds . and what ’ s more , the control system realizes the motor ’ s correct commutation and smooth running 硬件部分先作了整体论述,然后论述了几个主要电路设计,重点论述了一些重要电子元器件及其参数的选择。软件部分首先论述了整体设计并给出了主程序流程图,然后分别论述了几个主要子程序并给出流程图,最后给出整个控制系统的“软化”策略。将本文的dsp控制系统具体应用到一台实验无刷直流电机上,实验结果表明本文所设计的控制系统能很好地控制电机顺利启动,启动时间不超过3秒,而且能很好地实现正确换相和稳定运行。
