步进式

To control stepping motors, the balance bridge power drive circuit is made up by TDA1521 integrated audio power amplifier, the pulse allotter is made up by the parallel ports of computer and latches.

双回转机构的步进电机控制电路由TDA1521音频集成功率放大器组成平衡桥式功率驱动电路，由计算机并行口经过锁存器构成脉冲分配器。

The system adopted active tracking,namely calculate the input angle of the tracking device in advance,the angle is correspondent to the sun position some moment.Photoelectric sensors react the sunlight that putting on different position of the platform, feedback electrical signal.Then single-chip applys the subprogram and sends out pulse to step motors according to the signals,can control the rotate angle and direction of the step motor. The mechanism has realized the automatic track to the sun, so that the trackers top flat board can be always vertical to the sunlight and arrive the furthest receiving energy.

系统采用主动式跟踪，即预先计算好对应于某时刻太阳位置的跟踪机构的输入角度，通过跟踪器上平台不同位置上摆放的光电传感器感受该太阳位置的光照，反馈回电信号，单片机根据该信号调用子程序发出脉冲对步进电动机的转动角度和方向进行控制，实现了机构对太阳的自动跟踪，使跟踪装置的上平台始终处于垂直于光照方向，达到了能量最大限度的接收。

Stepper motor is a pulse will be transferred into angular displacement of the Electrical and Mechanical-DAC devices.

步进电机是一个将脉冲信号转移成角位移的机电式数模转换器装置。

Stepper motor is the working principle of electrical pulse signal into angular displacement of a Electromechanical Digital to Analog.

步进电机的工作原理是将电脉冲信号转换成角位移的一种机电式数模转换器。

The position of permanent magnet, optimum length of axial field coil and choosing principle of iron core length are discussed.

然后提出了混合磁路多边耦合电机的方案，即在永磁感应子式步进电动机上增设一套轴向励磁线圈以对永磁体磁场进行补偿。

The triangle mesh model of surface was extracted by constructin g an implicit surface function.

首先建立插值散乱数据点的隐式曲面方程，然后使用步进立方体算法提取出曲面的三角网格模型。

In order to overcome the statistic of step sizes in the inertial system, we have designed an inchworm system by electromagnetic clamping. A displacement speed of 30μm/s has been attained, and its step sizes is uniform.

为了克服惯性移动方式所出现的步长随机性的问题，我们又进一步研制了电磁吸引式的步进驱动系统，实际测得其移动速率约为30μm/s。

The main products include: large type heating furnace of continuous walking type furnace and annular furnace、 Tilting Aluminum Melting、holding temperature furnace、 homogenization furnace、 annealing furnace、quenching furnace、aging furnace used for aluminum material;copper material of heating furnace、 annealing furnace（brightness/commonly）、reverberator etc; heating furnace、quenching furnace、tempering furnace、drying furnace、sintering furnace、carburizing nitriding furnace、aging furnace、quenching and high tempering furnace、normalizing furnace、galvanizing line and color coating line used for steel;sand core surface drying furnace、casting annealing furnace used in automobile generator profession;the main type furnaces include: pusher-type furnace、roller- type furnace、rotary- type furnace、 pit type furnace、 mesh-belt furnace、well- ty

公司的主要产品包括：步进炉、环行炉等大型加热炉；铝材方面的熔铝炉、保温炉、加热炉、均质炉、退火炉、固熔炉、时效炉等；铜材方面的加热炉、退火炉、反射炉等；钢铁方面的加热炉、淬火炉、回火炉、烘干炉、烧结炉、渗碳炉、氮化炉、时效炉、调质炉、正火炉、镀锌线、彩涂线等；汽车发动机行业的砂芯表干炉、铸件退火炉等；主要炉型有推杆炉、辊底炉、转底炉、坑式炉、网带炉、井式炉、燃油炉、箱式炉、台车炉、多用炉、钟罩炉、真空炉等。

The main products include: large type heating furnace of continuous walking type furnace and annular furnace、 Tilting Aluminum Melting、holding temperature furnace、 homogenization furnace、 annealing furnace、quenching furnace、aging furnace used for aluminum material;copper material of heating furnace、 annealing furnace（brightness/commonly）、reverberator etc; heating furnace、quenching furnace、tempering furnace、drying furnace、sintering furnace、carburizing nitriding furnace、aging furnace、quenching and high tempering furnace、normalizing furnace、galvanizing line and color coating line used for steel;sand core surface drying furnace、casting annealing furnace used in automobile generator profession;the main type furnaces include: pusher-type furnace、roller- type furnace、rotary- type furnace、 pit type furnace、 mesh-belt furnace、well- type furnace 、gas fired furnace、 box type furnace、trolley furnace、multi-purpose furnace、 bell-type furnace 、vacuum-type furnace and so on.

公司的主要产品包括：步进炉、环行炉等大型加热炉；铝材方面的熔铝炉、保温炉、加热炉、均质炉、退火炉、固熔炉、时效炉等；铜材方面的加热炉、退火炉、反射炉等；钢铁方面的加热炉、淬火炉、回火炉、烘干炉、烧结炉、渗碳炉、氮化炉、时效炉、调质炉、正火炉、镀锌线、彩涂线等；汽车发动机行业的砂芯表干炉、铸件退火炉等；主要炉型有推杆炉、辊底炉、转底炉、坑式炉、网带炉、井式炉、燃油炉、箱式炉、台车炉、多用炉、钟罩炉、真空炉等。

Based on the electronic focus technology development of state-of-the-art,the paper suggested a complete apparatus s cheme ofauto-focus based on SSPD(self-scanned photodiode array)and 8098 singl e chipprocessor,giving out a focus criterion algorithm based on image high freq uencystatistics.The function of auto-focus of both reflected and transparent o pticalmicroscope was realized.Meanwhile some corresponding problems such as sta bility of lightsource,step motor driving etc.were also discussed,which greatly improved the accuracy andreliability of the system.

文摘：在介绍与分析了国内外电子调焦系统的技术发展与现状的基础上，提出了一种基于SSPD与8098单片微处理器自动调焦的整体技术方案，给出了基于图像高频成分统计的聚焦判识算法，在此基础上实现了反射式与透射式光学显微镜的自动调焦，同时对系统的可靠性有关的其它相关问题如光源稳定性、步进电机驱动等问题也进行了讨论。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。