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...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
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.
Robot advances in connectivity, collaboration, and programming; Advanced process control; Industrial wireless developments; Multiplatform system integration
Sensor-to-cloud interoperability; PID and digital control efficiency; Alarm management system design; Automotive industry advances
Make Big Data and Industrial Internet of Things work for you, 2017 Engineers' Choice Finalists, Avoid control design pitfalls, Managing IIoT processes
Motion control advances and solutions can help with machine control, automated control on assembly lines, integration of robotics and automation, and machine safety.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

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

Big Data and bigger solutions; Tablet technologies; SCADA developments
SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Flexible offshore fire protection; Big Data's impact on operations; Bridging the skills gap; Identifying security risks
click me