×
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

Jobs

Looking for High Temp AC or DC-Brushless Motor

Looking for High Temp AC or DC-Brushless Motor

Looking for High Temp AC or DC-Brushless Motor

(OP)
We are looking for either an AC motor or DC-brushless motor that can work under 0-100°C temperature ranges (this is the estimated winding temperature even with a cooling fan, ventilation, and heat sink).  The specs include:

-3000 to 6000 rpm (it will be fixed speed, but these are the acceptable ranges; gearing is an option but not optimal)
-10 oz-in torque (very little torque at nominal and starting conditions)
-greater than 10,000 continuous duty life
-less than 2.25" diameter and 4.5" long
-working temp. ranges between 0°C to 100°C (winding temp)
-reversible direction
-24VDC or 220VAC (could use lower VAC w/ step-down transformer; e.g. 115VAC, 24VAC)

The motor is turning a magnet that is coupled to a gear pump.  It is pumping fluid that reaches 200°C, but even with heat-isolated coupling, fan cooling, and heat sinking the motor temp is still high.

All AC motors that I've found have been too big.  Also, I can't use one with a brake because it dissipates too much heat.  We are okay with switching a series capacitor, though.

If we go with a DC-brushless, I would like to find one with integrated electronics to decrease the development time.  Unfortunately, this is something I need to get on order within the next couple of days.  We have 2 control signals availabe for reversing, starting and stopping.

The reason we are going w/ an AC or DC-brushless is for the long-life.  We were using a DC brush motor, and we only got 1000hrs continuous duty out of it.  We could use a stepper, but I haven't a small enough driver board to fit into our chassis.

I hope I covered all of the details.  I would really appreciate any feedback, as this has become a huge roadblock in the development of our project.  Thanks in advance to anyone w/ input!

Todd B.
Electrical Engineer

RE: Looking for High Temp AC or DC-Brushless Motor

Suggestion: Visit
http://www.thomasregister.com
and type Motors: Brushless DC under Product or Service, which will return 186 companies to contact with your motor specifications.
Alternately, type Motors: AC under Product or Service, which will return 260 companies to contact with your motor specifications.

RE: Looking for High Temp AC or DC-Brushless Motor

Call EAD Motors 603-742-3330.  Sounds like a piece of cake.

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!


Resources