经过克里斯·戈特利布（Chris Gottlieb）和迈克·施韦纳（Mike Schweiner），罗克韦尔自动化全球产品经理
A look at four ways that single-cable motion solutions can simplify system design.
Have complex cabling systems tied you up? OEMs today are expected to reduce system cost and inventory, while simultaneously increasing sustainability and ease of use. These tasks can be difficult with motion systems communicating through analog encoders that require multiple cables to operate effectively.
But today, digital technology has paved the way for the creation of single-cable motion solutions that bundle servo feedback and power cables into a single, all-inclusive cable. Pairing this new technology with highly engineered motors and drives, machine builders have a proven single-development platform for both servo and induction motor control. The result: less design time, smaller cabinet space, improved power density and greater energy efficiency.
罗克韦尔自动化’s smaller Allen-Bradley Kinetix 5500 servo drive enables a smaller cabinet, which helps reduce machine footprint and improve manufacturing facility floor usage.
How does it work?
Traditional servo drives and motors are connected by two cables—one for power and one for feedback. The encoder, located in the servo motor, acts as a position sensor sending analog signals in the form of sine waves to communicate position and location of the motor shaft. The servo drive reads the signals to determine absolute position of the servo motor. In these systems, power travels over a different cable to prevent electromagnetic interference with the feedback transmissions.
Single-cable motion solutions are now available with digital encoders. Digital information packets are less susceptible to interference from power transmissions. A digital encoder also improves motion-system diagnostics because many different packets of information can be sent over the same digital-bus system, without the need for a wire dedicated to a specific analog signal. This frees up users to collect additional data, which allows the system to run and start to use added data points to optimize performance. Additionally, a digital encoder sends absolute coordinates to the drive, removing the need for the servo drive to break down or read the message. Because the information packets are digital in nature, and due to technology and design improvements with the servo interface, cable, circuit boards and connectors, servo feedback signals in single-cable solutions are less susceptible to power-line interference than a traditional analog pulse width modulation (PWM) signal. The PWM action produces electrical noise that can interfere with feedback signals.
单盖设计的好处
单芯电缆运动解决方案可以提供一个高度engineered, robust alternative to current motion systems. Without compromising system performance, OEMs can reap the following additional benefits:
系统成本降低– Developing servo motion systems with a single-cable approach means OEMs only have to buy, design for, maintain and stock a single cable, reducing total system cost. Recent ordering practices have also made it possible for OEMs to purchase cable(s) in one-meter increments, allowing them to buy what the application demands and no more.
Ease of use- 每次伺服驱动器的电缆终止较少，减少了安装时间，降低了调试和维护错误的机会，并大大减少了用于故障排除和维修的时间。具有两条电缆，一个伺服电机和伺服驱动器的传统系统，除了进行整体系统通信的接线外，还需要14条或更多电线才能进行反馈和电源连接。如果存在连接错误，则用户必须单独通过每条电线来诊断和修复问题。借助单电缆解决方案，现在有三根电线，两条制动线（如果需要）和两条通信线，可以极大地简化该过程。您从系统中取出的每条电线都可以保存在设置和维修中。
更少的终止也简化了机器维护，这可以最大程度地减少雇用外部承包商的需求，即节省时间，金钱和挫败感。
From an applications standpoint, a variety of applications exist where single-cable solutions are useful. On any small machine where space is at a premium, one cable to route instead of two is really helpful, and having the cable in 1-m increments reduces coiling of cables where users may not have space. Additionally, for multiple axes, it greatly simplifies wiring, so if the user is spending ten minutes to wire up a single axis on a traditional system, with the fewer feedback connections, it will go much faster—potentially a couple of minutes. Over ten or more axes, this saves a significant amount of time.
Enhanced energy efficiency and sustainability- 通过优化的驱动力配对开发了单式运动解决方案。这可以追溯到如何产生扭矩 - 通过磁铁和伺服电动机中的专用铜绕组之间的相互作用。为了创建更多的扭矩或更快地使电动机移动，必须添加额外的铜。相反，有时伺服电机包含比必要的更多的铜缠绕，最终使用过多的能量。就像您只希望您的汽车以15,000 rpm的速度行驶，如果您只行驶15英里 /小时，您就不希望只需要以8,000 rpm的电动机驱动500 rpm运行的输送机。具有最佳匹配电动机和驱动等级的运动系统使用可比解决方案的一半。单口解决方案通常以优化系统的形式出售。将其与消除多余的电缆相结合，OEM具有总体运动解决方案，需要更少的能量和更少的零件才能运行。
占地面积减少- 单式解决方案实现了较小的伺服驱动器，这又意味着机柜可能更小。这有助于减少机器占地面积并改善制造工厂的使用情况。
Single-cable motion solutions provide OEMs with an array of benefits without compromising system scalability and performance—once again proving the old adage ‘less is more.’
罗克韦尔自动化
ab.rockwellautomation.com
帖子Single-cable Designs Cure Wiring Woesappeared first onWire and Cable Tips.
Filed Under:电线和电缆提示,Cables + cable management
