×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Efficiency in motor control

Efficiency in motor control

Efficiency in motor control

(OP)
I have been asked to provide some input on improving efficiency in motor control. Improved motor efficiency is only one part of the equation as most of the energy wastage is in the driven load. Any good ideas or pointers?

Mark Empson
http://www.lmphotonics.com

RE: Efficiency in motor control

Maybe you should forget about your driven load when you first look at this problem - and evaluate the efficiency/complexity/charachteristics of the existing control network and how it was matched to the driven load - once this is known you can then look at improving the control network.  Try looking at a software package called Simbol/look up a method called the de Souza method - a simple approach to the design of control networks - and modelling systems.  you cannot change the efficiency of the load (if it already exists)- so start looking at the order of the control network once you understand how they were matched originally and how to improve that network.  

RE: Efficiency in motor control

You have a great website.

Can you be more specific about what info you want.

RE: Efficiency in motor control

(OP)
Just looking for ideas other than changing the motor to improve the overall efficiency of installations.

Mark Empson
http://www.lmphotonics.com

RE: Efficiency in motor control

It will be very hard to improve the efficiency of the electric motors unless you want to spend the bucks to buy super energy-efficient motors.  You will have to wait for a time-period payback, which can be good depending on what you are powering. Short term, in-house solutions include power factor correction, precision alignment of components and reducing vibration.  Reduce or eliminate steam and air leaks. Infrared analysis and tribology can also benefit, depending on your particular application.  

RE: Efficiency in motor control

Any driving arrangement for a given load can be looked from three aspects to arrive at the optimal selection of an efficient system - Electrical (motor), electronic (control) and mechanical (transmission between the prime mover and the load). Truly speaking, there is no single system which can be called the best and a combination can be arrived at by studying the application (charecteristics and parameters of driven load)

Electrically, an optimal rating is to be arrived at depending on the load parameters. This would mean matching the prime mover characteristics with load characteristics. The result could be an AC / DC / Servo...

Electronically, the speeds or torque controlling methods (considering feedbacks and tolerences)have to be incorporated in the control scheme resulting in simple V/F, Vector control, analog/digital, servo...with application specific modules.

Mechanically, the losses in the transmissions have to be looked into. This is one aspect that people seem to overlook in most cases. A worm reduction gearbox is a highly inefficient gearbox for large reduction ratios (so much so that in many cases motors are selected more to cover the losses in the gearboxes than to drive the machine) and planetary / hellical gearboxes are much more efficient.

So, invariably it is the overlapping areas of engineering and economics that decide selection of the right combination and this overlapping area would shift from application to application.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

White Paper - Implementing a Multi-Domain System
IoT systems are multi-domain designs that often require AMS, Digital, RF, photonics and MEMS elements within the system. Tanner EDA provides an integrated, top-down design flow for IoT design that supports all these design domains. Learn more about key solutions that the Tanner design flow offers for successful IoT system design and verification. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close