转速

The basic relationship between the the first half-wave peak value of transient current and the initial firing angles is found by means of analytical method.The practical method is put forward to determine the initial two-phase and the third phase firing angles with the limiting value and the space vector varying track of transient current.And then the subsequent series of firing angles with the even step are calculated by using the speed at the time of re-switching.The suppressive effect to the inrush current is verified with simulation and experiment of rapid soft re-switching control,by which the influence of different speed to rapid soft re-switching course is analyzed besides.3 To analyze the power loss for typical periodically variable running load and deeply study the energy-saving principle and control mode of the intermittent power supply approach. Futhermore,the novel integrated energy-saving control technique is developed on base of the intermittent power supply approach.

通过解析方法找到快速软投入初始触发角与瞬态电流首半波峰值之间的基本关系，进而提出了由限流值和空间向量轨迹确定初始两相和第三相触发角的方法，并以固定步长均匀递减的方式由投入时转速计算出其它后续触发角；结合仿真和实验验证了快速软投入对冲击电流的抑制作用，并分析了不同转速下投入时对电源快速软投入过程的影响。3对典型周期性变工况负载特性进行能耗分析，深入研究断续供电节能机理和控制模式，并进一步发展了以断续供电为主的综合节能控制新技术。

This paper presents several control methods for BLDC motor, and describes their fundamental principles ,advantages and disadvantages in brief. The method of speed-independent function,based on a new flux linkage function,is explained in detail. This method makes it possible to detect the rotor position over a wide speed range from near zero to high speed.

本文介绍了几种无位置传感器无刷直流电动机的转子位置检测方法，并对它们的基本原理，优缺点作了简单的说明，详细地阐述了基于一种新磁链函数之上的与速度无关的位置函数控制方法，利用这种方法从零转速到高转速的宽速度范围内能检测到转子位置。

From the experimental results, both in no-load and full-load cases, all the proposed slip estimation schemes exhibit good performances of speed tracking and robust load disturbances rejection.

由实验结果证明不管在无载或满载情况下，所提出四种不同无转速感测的系统都具有良好的转速追踪能力，并且对於负载的扰动系统都拥有很好的强健性能。

Applications:belt converyers,scraper converyers,and converyes,of all kinds all of ball mills hoisters,crushers, execavators,mixers,straighteners,cranes,etc.

碎机、挖掘机、搅拌机、绞直机、起重机等各种机械。选用：在无特殊要求的情况下，可根据电动机的转速（即液力偶合器的输入转速）和

By restricting accumulation of negative integral elements when performing integration by a proportional integral control unit until the actual temperature of a cooling target fluid reaches the corresponding target temperature, the method having this feature enables the control of the fan revolution speed so that the fan revolution speed rises immediately when the actual temperature of the cooling target fluid exceeds the target temperature.

通过限制积累负积分元素时，表演融合，由比例积分控制单元，直到实际温度冷却液指标达到相应的目标温度，该方法具有这项功能可控制风扇转速，使风扇转速立即上涨时，实际温度的冷却液指标超过目标温度。

The influences of volumetric coefficient, pressure coefficient, temperature coefficient, and leakage coefficient on compressor volumetric efficiency were analyzed.

容积系数主要与压缩机的结构尺寸和吸、排气压力比有关，压力比的变化对容积系数构成以多变膨胀指数为幂的指数影响；转速变化对压力系数构成二次影响；温度系数和泄漏系数同时受到与压力比和转速的影响。

There are six technical characteristics in the system. lUsing the way alike differential input to increase the ability of anti-jamming. 2Combining multiple thread with DMA to ensure real time online monitor. 3Realizing high precision measurement of rotating speed by general purpose counter and timing in A/D card.4Using TCP/IP network protocol to realize high speed data transport between upper computer and lower computer.

该监测诊断系统具有六大主要技术特点： 1、利用准差动输入，提高现场抗干扰能力； 2、将基于Windows平台的多线程技术与DMA技术结合，保障在线系统采样的实时性与多任务性； 3、采用A/D卡自带定时/计数器对机组转速进行高精度测量，实现加窗转速跟踪快速分析； 4、利用TCP/IP协议实现上下位机网络数据高速传输； 5、采用传统振动测试与RS—485总线结合对多种测试信号进行混合采集。

To compare with traditional EVT system, reserved some advantages, such as two rotors can run at different speed, and so on. The innovations of BL-DMPM included:① No brush and slide rings were needed, so simpled the structure of motor, and improved the reliability.② The rated speed of two rotors can be different according to selection of pole numbers, so the proposed motor was more appropriate than the traditional one when it was used in hybrid electrical vehicle, where large torque at low speed was needed.

它保留了传统双机械端口电机的主要优点，如两个机械端口可运行在不同转速和可无极连续变速等，而取消了传统双机械端口电机中的电刷和滑环，简化了电机结构，提高了可靠性，可以设计成使两个机械转子的额定转速相差很大，从而更适用于需要低速大力矩的混合动力汽车等场合。

The innovations of BL-DMPM included:① No brush and slide rings were needed,so simpled the structure of motor,and improved the reliability.② The rated speed of two rotors can be different according to selection of pole numbers,so the proposed motor was more appropriate than the traditional one when it was used in hybrid electrical vehicle,where large torque at low speed was needed.

它保留了传统双机械端口电机的主要优点，如两个机械端口可运行在不同转速和可无极连续变速等，而取消了传统双机械端口电机中的电刷和滑环，简化了电机结构，提高了可靠性，可以设计成使两个机械转子的额定转速相差很大，从而更适用于需要低速大力矩的混合动力汽车等场合。

B Where the Load up/down program is not provided, the Engineer shall increase and decrease the speed in accordance with the speed increase and decrease procedure of each ship, and shall pay attention to the Load Indicator, the RPM of the Main Engine or RPM of the propeller shaft, CPP pitch, the speed

如已提供增减负荷程序，轮机员应根据速度增加和减少程序进行加减速，特别注意，负荷显示、主机转速、螺旋桨轴转速、可变螺距、船速等，避免突然加减负荷。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐