Servo motor versus induction motor systems

Cover story tutorial: Choosing between permanent magnet servo motor or induction motor systems depends on application performance criteria. Consider this advice for the best fit. See more information and photos online, including comparative table.

10/31/2012


Control Engineering, October 2012Motor selection: When deciding between permanent magnet (PM) servo motor or induction motor systems, consider dynamic performance, torque density, inertia matching, and control schemes. Choosing between servos and induction motors depends on the level of application performance and costs. Induction motors are simple, low cost, and straightforward.

Servo motors can offer higher performance, faster speeds, and smaller sizes. PM synchronous motors offer advantages on high-energy- consuming and high-dynamic applications, compared to induction motors. Variable frequency drives used with asynchronous motors also can be used with synchronous servo motors, producing higher efficiencies than an asynchronous motor, using perhaps 30% less energy in positioning applications.

Induction motor systems (lower cost, rugged, reliable, and well known) can offer an alternative to servo motor systems (the traditional, established solution) for certain applications. This, of course, is based on similar electronic controls being used (with the latest technology and approximately the same cost), leaving the cost of motors the differentiating issue.

Thanks to Frank Bartos, Control Engineering contributing editor, and to the four authors below, for the information above. In this issue, “Inside Machines” has a direct drive rotary motor technologies article.

- Edited by Mark T. Hoske, content manager, CFE Media, Control Engineering, mhoske@cfemedia. com.

The articles below were in the cover story in a shorter format. Links to the longer online versions follow.

 

Permanent magnet motors outperform induction motors in many applications

Permanent magnet synchronous motors offer significant advantages on high-energy-consuming and high-dynamic applications, compared to induction motors. See table, photo gallery.

 

Permanent magnet servomotors versus induction motor systems

Motor selection: When deciding on the use of permanent magnet (PM) servomotors or induction motor systems, consider dynamic performance, torque density, inertia matching, and control schemes.

 

Servos versus induction motors: Look at performance, costs

Choosing between servos and induction motors depends on the level of performance required by the application and costs. Induction motors are simple, low-cost, and straightforward. Servos can offer higher performance, faster speeds, and smaller sizes.

 

Drives and designs can make synchronous servo motors more efficient

Information in the last section of the cover story was summarized from this article. Energy-saving drive solutions - Industrial Energy Management: Intelligent concepts cut costs and protect the environment while saving energy; high-efficiency energy conversion and recovery of braking energy also can help.



No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
Each year, a panel of Control Engineering editors and industry expert judges select the System Integrator of the Year Award winners.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Learn how to create value with re-use; gain productivity with lean automation and connectivity, and optimize panel design and construction.
Go deep: Automation tackles offshore oil challenges; Ethernet advice; Wireless robotics; Product exclusives; Digital edition exclusives
Lost in the gray scale? How to get effective HMIs; Best practices: Integrate old and new wireless systems; Smart software, networks; Service provider certifications
Fixing PID: Part 2: Tweaking controller strategy; Machine safety networks; Salary survey and career advice; Smart I/O architecture; Product exclusives
The Ask Control Engineering blog covers all aspects of automation, including motors, drives, sensors, motion control, machine control, and embedded systems.
Look at the basics of industrial wireless technologies, wireless concepts, wireless standards, and wireless best practices with Daniel E. Capano of Diversified Technical Services Inc.
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
This is a blog from the trenches – written by engineers who are implementing and upgrading control systems every day across every industry.
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Control Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.