o*******r
发帖数: 4921 | 1 国内还是有人能做的.
我们曾经成立了一个公司做 伺服电机+电机控制器.
我们能做到停转在控制位置的3度以内.后来公司还是挂了,我们这些工程师太钻技术的
牛角尖,生产化做的不好,资金的支撑也很糟糕. |
|
o*******r
发帖数: 4921 | 2 恩,我们做到了松下的那个程度.但比德国的同类产品要差. |
|
o*******r
发帖数: 4921 | 3 国内连做的好的编码器都没有.唉.
特别是那些不思进取的大型国营电机厂.10年前离开他们的时候,他们做不出来步进电机
,现在问问他们的VP,还是做不出来.这还只是步进电机. |
|
o*******r
发帖数: 4921 | 4 这个要多跟东阳的那些磁钢厂打交道,他们还是能搞出来的. |
|
g******u
发帖数: 3060 | 5 那请教一下国内做中到大功率的感应电机，无刷直流大概水平如何？（算是１０－５０
０KW级吧）。
感应电机我看到好象有卖到国外的，但是无刷的永磁体之类不知水平怎么样？
还有国内如果电机水平差，是原材料不行，加工不行，还是别的原因？ |
|
p***e
发帖数: 472 | 6 you may take a look at the magazine - eDrive. it used to have quite some
advertisements for servo motors, etc. you may refer to experience over
there. |
|
p***e
发帖数: 472 | 7 you may take a look at the magazine - eDrive. it used to have quite some
advertisements for servo motors, etc. you may refer to experience over
there. |
|
gi
发帖数: 496 | 8 Product Development Electrical Engineer
Sample projects: future platforms, customer designs, quality improvement
Duties:
Leadership role in design and development projects.
Translate user needs from request to proposal through design and final
delivered product.
Design electronic and mechanical systems to meet specific functions and
requirements.
Provide training and technical documentation in support of the customer
training activity.
– Mentor others “train the trainer”.
Requirements:
BSEE or ... 阅读全帖 |
|
C*********4
发帖数: 59 | 9 半导体公司在制程技术上是领先硬盘公司磁头技术的（尽管是不同的材料），但硬盘还
有盘片，servo，channel，整体的集成技术是多年的积累，这两不好比难度， |
|
|
y***k
发帖数: 162 | 11 那时候我们那个UV设计上对那个要求多多。。然后就找起来比较麻烦。
我们没法ebay 买。必须比来比去。。烦死了。。 |
|
|
H*H
发帖数: 1244 | 13 也不知道发这个版对不对
我要设计一个用机械带动的装置。设计如gif动画所显示。（最终是想要，机械手能够
move up and down like in the animation。 并且希望整个装置每９０度旋转， 顺时
针。 ）
这个完全是自己DIY，不需要很精确
整个装置大概１６inch 高。
大部分材料希望用木头。
我需要用servo motor and geneva mechanism。
不知道 哪里可以买到？ google 了一下，motor的种类太太多了，不知到什么样的适合
我的设计。因为是自己DIY
所以当然是价格越便宜越好
要是我的设计有缺陷，请指教。 |
|
D****R
发帖数: 6053 | 14 求8本电子书,每本1000伪币, 请PM我，如果你找到任何一本电子书,在此先感谢.
History of Shock Waves, Explosions and Impact: A Chronological and ...
By Peter O. K. Krehl
Wave Propagation in Fluids: Models and Numerical Techniques
By Vincent Guinot
Hydraulic Power System Analysis
By Arthur Akers, Max Gassman, Richard Smith
Hydraulics of Pipeline Systems
By Bruce E. Larock, Roland W. Jeppson, Gary Z. Watters
Hydraulics of Pipelines: Pumps, Valves, Cavitation, Transients
By J. Paul Tullis
Hydraulic Control Systems
By Herbert E. Merri... 阅读全帖 |
|
t*******t
发帖数: 301 | 15 Let's startup a company.
My background:
Kinematic calibration, visual servoing, motion planning, computer vision,
machine learning, and control theory. Work in a research lab now.
We can do some consulting work first.
the right time for robotics industry. Robotics technologies are mature
enough for many commercial products. There are many areas with huge
potentials, such as personal service robots, flexible manufacturing, and
warehouse operation. What is needed is system integration and fun |
|
M*4
发帖数: 1457 | 16 这些治疗方法都是通过device的：
Continuous positive airway pressure (CPAP)
Bilevel positive airway pressure (BiPAP)
Oral appliances for sleep apnea
Adaptive servo-ventilation (ASV） |
|
k**h
发帖数: 2929 | 17 铁杆野生动物爱好者，希望在这里找到些同好一起聊聊
也来说说动物摄影（不管是不是野生）最基本的一些东西
1. 机位平视，拍摄的时候尽量做到与拍摄对象平视，尤其是小动物，例如拍地上的
松鼠，就要趴在地上拍，从一个松鼠的视角来看一只松鼠，有效地拉近照片的观察者与
拍摄对象的距离
吃橡子的小松鼠 by keah
2. 留白，在动物的运动或视线朝向的方向留出更多的空白，达成视觉上的平衡
黄冠夜鹭 by keah
3. 抓住眼神，不管是拍动物还是人像，眼睛是心灵的窗口，好的照片让观者和动物
有了eye contact，须知动物也是有心情的，看着它的眼神，你会发现它们和我们并无
太多不同，
犀利的眼神, 白尾鹞by keah
平静的眼神 5月清晨的麋鹿 by keah
惊恐的眼神 被惊吓的兔子 by keah
4. 干净的背景，配合柔和的曝光，突出细节
沙滩上的三趾鹬by keah
而强烈的对比度，带来动感和冲击力
落日与雏鹰 by keah
5. 野生动物和生活的环境密不可分，拍动物的时候要将它独特的环境表现出来，令
观者身临其境
悬崖上的土拨鼠 by keah
狼b... 阅读全帖 |
|
c******x
发帖数: 1197 | 18 8. 飞燕那张, al servo是啥对焦方式? |
|
s*****2
发帖数: 3103 | 19 差不多一半是用300 f/2.8 IS II + 2x TC III拍的，另一半是100-400 IS，机身一般
是50D。
如果天空太亮，加曝光补偿即可；拍飞行中的鸟，要用AI Servo。 |
|
a***a
发帖数: 12425 | 20 你说的“300 f/2.8”我能看懂，“IS II + 2x TC III”和“AI Servo”我就不知了、
估计是机型吧。我先练习加曝光补偿这一条。谢！ |
|
s*****2
发帖数: 3103 | 21 这里高手很多，我只说一下自己心得。
首先是兵器要给力。没有办法，拍鸟，尤其是飞鸟，兵器还是很重要的。机身最好使准
专业机以上（这样自动对焦、连拍才给力）。镜头当然要长焦望远，最好是大光圈。我
用的是Canon 70D（我打算明年进一个7D II）, 300mm f/2.8 IS, 大多数时候加一个1.
4x Teleconverter，有时候加一个2x，这样达到420mm f/4,600mm f/5.6。本版有用
500mm f/4 和 600mm f/4的。如果预算有限，最好也进个100-400,80-400，或最少也要
有个70-300 zoom lens.现在还有150-600的镜头，应该也不错，但我没用过。
另外就是多钻研技术啦！拍运动中的动物要用AI Servo Focus，高速连拍，这样偶尔能
蒙中一张，呵呵。总之多练多拍，勤能补拙。 |
|
w******x
发帖数: 4396 | 22 总共换了俩vacuum pump，两个cruise computer，两个vacuum servo和3个cut off
valve。真正有问题的是一个pump和两个valve。 |
|
V***b
发帖数: 3419 | 23 不是RTR，是个kit，这样motor, servo, tires可以用比较高端的，像Tekin FX-R 35T,
Savox SV-1270TG这些RTR里都看不到。 |
|
p*********e
发帖数: 32207 | 24 【 以下文字转载自 Military2 讨论区 】
发信人: pandamalone (0000~史前圣灵猫熊), 信区: Military2
标 题: 美不胜收: F22在jacksonville NAS的飞行展示
发信站: BBS 未名空间站 (Mon Oct 27 13:52:24 2014, 美东)
发信人: pandamalone (0000~史前圣灵猫熊), 信区: PhotoGear
标 题: 美不胜收: F22在jacksonville NAS的飞行展示
发信站: BBS 未名空间站 (Mon Oct 27 02:22:58 2014, 美东)
//按,原文首发在https://bbsmit.org/threads/f22.111398/
器材为5D3+400/5.6,这个组合实际用起来不算理想,
首先因为没有防抖所以当以1/200或更低快门拍摄螺旋桨飞机时画面会糊
其次对焦不算靠谱,体现在当首次对飞机进行对焦时经常性抓不到主体
后来摸索了一下发现如果首先手动对飞机追焦到大体合焦之后再进入AF servo,
则成功率会提高很多,但仍然不能保证一次合焦,最多时需要反复... 阅读全帖 |
|
p*********e
发帖数: 32207 | 25 这个不会,因为我在追焦过程中频繁能看到边缘的各个对焦点合焦
(61个对焦点全部开启并用al servo模式,这样取景器里会实时显示哪些点对上焦)
而且一般我第一张都是试图用中心对焦点先对上,但经常性对不到,
表现为极端off focus,视野里面一片糊(对焦距离在很近,但实际物距很远时的效果)
然后一旦手动拧对焦环到粗略能看到飞机,AF就靠谱得多. |
|
w*******y
发帖数: 60932 | 26 LEGOMindstorms NXT 2.0
Intelligent LEGO Brick Features 32-bit Microprocessor
619 Pieces.
Item # 516801
Link:
http://www.costco.com/Browse/Product.aspx?Prodid=11532052
$239.99
Shipping & Handling included *
LEGO MINDSTORMS NXT is back and better than ever: new models, more
customizable programming and all-new technology! MINDSTORMS NXT 2.0 combines
the versatility of the LEGO building system with new technologies, an
intelligent microcomputer brick and intuitive drag-and-drop programming
softwa... 阅读全帖 |
|
w*******y
发帖数: 60932 | 27 Canon EOS Rebel XS Black with EF-S 18-55IS DSLR:
http://shop.usa.canon.com/webapp/wcs/stores/servlet/product_10051_10051_204269_-1
Features
10.1 Megapixel CMOS Sensor
Canon?s CMOS (complementary metal oxide semiconductor) sensor captures
images with exceptional clarity and tonal range, and offers the most pixels
in its class. It offers many of the same new technologies first seen in
Canon?s professional EOS-1D Mark III to maximize each pixel's light
gathering efficiency. It?s an APS-C size senso... 阅读全帖 |
|
|
w*******y
发帖数: 60932 | 29 www.overdriverc.com:
http://www.overdriverc.com
has the new Blade 3D helicopter at a very low pirce (pre-order). I couldn
't find it lower anywhere and I know how HH is about advertised pricing.
All I know is I want one badly and just put in my preorder.
BNF - www.overdriverc.com:
http://www.overdriverc.com
RTF- www.overdriverc.com:
http://www.overdriverc.com
BLH3580 E-Flite Blade mCP X BNF Micro Helicopter. This helicopter will give
transitioning pilots a more agile and capable collective p... 阅读全帖 |
|
w*******y
发帖数: 60932 | 30 I have no idea why this drive is cheaper than same size and brand drives
that have 32MB cache. I am trying to figure out if there is something
obvious I am missing that is making this drive come in at close to pre
flooding price but can't seem find it. I have placed an order for one myself
but would like to see if others think this is a good deal or not.
Linky:
http://www.amazon.com/Barracuda-7200RPM-Cache-3-5-Inch-Internal
Product Features
1TB 7200 RPM Hard Drive
SATA 6Gb/s interface optimizes ... 阅读全帖 |
|
w*******y
发帖数: 60932 | 31 Seagate Barracuda 7200 3 TB 7200RPM SATA 6 Gb/s NCQ 64MB Cache 3.5-Inch
Internal Bare Drive ST3000DM001
3TB 7200 RPM Hard Drive
SATA 6Gb/s interface optimizes burst performance
Seagate AcuTrac servo technology delivers dependable performance, even
with hard drive track widths of only 75 nanometers
Seagate OptiCache technology boosts overall performance by as much as 45
% over the previous generation.
Ships in Certified Frustration-Free Packaging
Best Fit Applications include:... 阅读全帖 |
|
t**********l
发帖数: 24 | 32 当前职业：嵌入式系统软件
研究（教育背景）：计算机专业(人工智能与智能控制)。 做过智能移动机器人，AGV(
自动导引车)。软硬件都懂一些。
Motion control方面：做过贴片机(SMT machine)的控制系统软件(包括线性马达，
servo, stepper etc)。
兴趣方向：嵌入式系统软硬件开发，RTOS, 机器人实用技术等等。
在美东北部。 |
|
l***g
发帖数: 1035 | 33 what do you need it for? robot? you might want to start with step motor |
|
|
|
t*******t
发帖数: 301 | 36 They have to match. But it is easy to have a match. For example, the 12A8
will drive a brush motor with PWM. Then you need to look at what is the
current range and voltage range. You also need to know what the output
voltage range of your DAQ is. You want to use the full range of the DAQ to
have better resolution. I forgot to mention encoders. To have a closed
loop control, you have to buy a encoder for the motor. Sometimes the motors
are selling with encoders. A cheap potentiometer may |
|
r******s
发帖数: 925 | 37 thanks a lot!
我主要想用AC的，今天上ebay bid 了Yaskawa， 希望能win
12A8
to
motors |
|
a****l
发帖数: 68 | 38 还要提醒一下，电感也要匹配。我前面3年就是用amc的放大器，还不错。 |
|
b**********g
发帖数: 2012 | 39 servo?
先在仿真里面好好调调pid的参数把 |
|
l***g
发帖数: 1035 | 40 like servo in the disc drive, pmsm control. anything that is not replacable
by a PLC. we might be talking about different types of motion control. Robot
ics have time constant on the order of 10ms so it is achievable with rtos; m
otor control has less than 0.1ms time constant so most are not suitable for
rtos yet. |
|
d****o
发帖数: 443 | 41 我不了解电机和控制, 但是想控制一个电机旋转的角度， 比如，5", 10", 15", 是不
是必须要用向打印机里的servo＋encoder ？ 有没有什么现成的模块 ？ |
|
d****o
发帖数: 443 | 42 我不了解电机和控制, 但是想控制一个电机旋转的角度， 比如，5", 10", 15", 是不
是必须要用向打印机里的servo＋encoder ？ 有没有什么现成的模块 ？ |
|
