谁了解直线电机？ 点击：10530 | 回复：60
发表于：2007-08-14 16:19:00
31楼
直线电机的原理就好比把一台旋转运动的电动机沿着半径的方向剖开并且展平。在直线电机中，相当于旋转电机定子的叫初级，相当于旋转电机转子的叫次级。初级中通以交流，次级就在电磁力的作用下沿着初级做直线运动。初级要比次级做得长，这样才可以延伸到运动所需要达到的位置。实际上，直线电机既可以把初级做得很长，也可以把次级做得很长，既可以初级固定、次级移动，也可以次级固定、初级移动。
直线电机最常见的种类有平板型、U型、套筒型等。其中平板型是最常用的直线电机形式。其结构简单、安装方便，并且可以根据应用需要选择水冷或自冷，长宽比也可以选择。这种形式的直线电机单机推力最大可达数万牛，速度从每分数十米至数千米，行程可高达千米以上。
目前国内市场上有很多品牌的直线电机，但都是国外企业，如西门子、丹纳赫、发那科等。近几年国内也有几家企业开始生产直线电机，如大族、凯奇电气、上银等。其中，凯奇电气的电机最大推力可达到上万牛。在今年CIMT的展会上看到了这家企业给北京机电院配的三轴直线电机加工中心，这说明国内企业也是很有实力的。
现在在网上可以查到很多这方面的资料，再有可以给这些生产商打电话咨询，一般情况下，不涉及核心技术问题他们都会解答。
直线电机最常见的种类有平板型、U型、套筒型等。其中平板型是最常用的直线电机形式。其结构简单、安装方便，并且可以根据应用需要选择水冷或自冷，长宽比也可以选择。这种形式的直线电机单机推力最大可达数万牛，速度从每分数十米至数千米，行程可高达千米以上。
目前国内市场上有很多品牌的直线电机，但都是国外企业，如西门子、丹纳赫、发那科等。近几年国内也有几家企业开始生产直线电机，如大族、凯奇电气、上银等。其中，凯奇电气的电机最大推力可达到上万牛。在今年CIMT的展会上看到了这家企业给北京机电院配的三轴直线电机加工中心，这说明国内企业也是很有实力的。
现在在网上可以查到很多这方面的资料，再有可以给这些生产商打电话咨询，一般情况下，不涉及核心技术问题他们都会解答。
发表于：2007-08-15 13:48:00
32楼
Any ratio of motor mass to external mass Limitation of rotating motors: ratio of the motor’s moment of inertia to the external moment of inertia ideally 1:1 not applied to linear motors. Linear motor 50 kg can easily move several tons.
High dynamics typically up to 8g through direct drive – No gear unit for speed conversion Minimum moved mass with moving secondaries – dynamics independent of travel range spindle/ belt have inertia proportional to travel length
Double the power with 2 motors connected to one inverter Two motors connected stiffly run in the same way as one large motor with one encoder and one inverter.
Minimal wear  High availability and reliability Example: Handling timber: Drive moves 3.3 km per hour in reverse!
Low noise development Machines with linear motors run more smoothly and quietly
Constantly high positioning accuracy (+/- 10µm is possible) No backlash, no wear out of the gear unit/spindle, no defined belt tension, belt not subject to spring effect
Very good positioning characteristics for speeds up to 6m/s (also with Hiperface absolute encoders) Exceeds conventional limits, belts run smoothly, limit rating for gear rack/pinion typically ~1.5 m/s
Make the best use of space available Several axes move independently of one another on the same rail
Reduced times for machine commissioning and installation at the OEM Machine modules are installed on-site at the end user; new belts do not have to be fitted nor encoders reset
Minimum life cycle costs The operating and maintenance costs during the machine’s life cycle are reduced
Suitable for short strokes and very long travel distances Same design principle for travel distances from 1 mm to 40 m, spindle does not lose tension, no belt noise, gear racks are not exposed
No downtime at block move axis moves „crash“ => spindle locked, belt dismounted, linear motor immediately ready after error reset
No wear debris/ no lubricants With belts or rack&pinion wear debris of the drive can minimize product quality
Innovative machine design
High dynamics typically up to 8g through direct drive – No gear unit for speed conversion Minimum moved mass with moving secondaries – dynamics independent of travel range spindle/ belt have inertia proportional to travel length
Double the power with 2 motors connected to one inverter Two motors connected stiffly run in the same way as one large motor with one encoder and one inverter.
Minimal wear  High availability and reliability Example: Handling timber: Drive moves 3.3 km per hour in reverse!
Low noise development Machines with linear motors run more smoothly and quietly
Constantly high positioning accuracy (+/- 10µm is possible) No backlash, no wear out of the gear unit/spindle, no defined belt tension, belt not subject to spring effect
Very good positioning characteristics for speeds up to 6m/s (also with Hiperface absolute encoders) Exceeds conventional limits, belts run smoothly, limit rating for gear rack/pinion typically ~1.5 m/s
Make the best use of space available Several axes move independently of one another on the same rail
Reduced times for machine commissioning and installation at the OEM Machine modules are installed on-site at the end user; new belts do not have to be fitted nor encoders reset
Minimum life cycle costs The operating and maintenance costs during the machine’s life cycle are reduced
Suitable for short strokes and very long travel distances Same design principle for travel distances from 1 mm to 40 m, spindle does not lose tension, no belt noise, gear racks are not exposed
No downtime at block move axis moves „crash“ => spindle locked, belt dismounted, linear motor immediately ready after error reset
No wear debris/ no lubricants With belts or rack&pinion wear debris of the drive can minimize product quality
Innovative machine design
发表于：2008-09-22 21:36:01
36楼
想要了解直线电机的找我吧 我有详细资料，国类外的都有．楼上的开玩笑啊，你没闭环反馈系统．还敢给他上电！ 那你是做发射塔吧！没有外加反馈的根本就不能控制，当然现在也有反馈集成在电机里的．如美国的smac是直线电机和音圈电机的集合体，重复定位精度达到了１０个纳米．直线电机主要是因为直接和负载相连 所以做出来的东西结构紧促，响应快加速度２０个g都很正常，精度高，便于维护．有需要的可以和我联系youngest3@163.com
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