lineair motor

[bert71]

I am searching for information regarding main parameters of performance of lineair motors. I will briefly explain my problem. I want to move a "U" profiled aluminum bar by means of a lineair motor. Vertical to the upstanding flanges of the profile a magnetic sinus form field (2, 3,.. phase) is generated. This field produces a current in the U-profile bar. Due to the induced current a force is generated to move the profile perpendicular to the magnetic field and the current. As you already see it is simular to an AC asynchronious motor.
Scematically: =U= (where = is a coil and U the profile)
The profile is 30mm wide and approx 10mm high. The distance between the profile and the coil is approx. 2mm both sides. The velocity of the profile should be between 1 and 5 m/s. The power about 300 W. What is the efficiency I can expect? Is the great distance between the coils (30+2+2 mm)a problem? Where should I pay attention to? What will influence the efficiency?

Thanks in advance.

 

[SERVOCAM]

I think I understand what your looking to do. You want to move you U-shaped part via linear induction. I have heard this being done and sold an linear induction motor to move an aluminum container.

The AC linear induction motor was stationary and when a product came down the conveyor, we were doing non-contact lane-diverting. The aluminum acts as the reaction plate for the motor. When AC voltage is applied to the coil, a traveling magnetic field is created. This induces current in the reaction plate which end up creating its own magnetic filed. The interaction of the two magnetic fields generate a force...and the aluminum part moves.

If you need more force, use multiple coils. Using a variable frequency inverter will give you speed & direction control.

Not sure how many companies make Linear AC Induction motors, I sold the Baldor one,

http://www.baldorlinear.com

Cameron Anderson - Sales & Applications Engineer
Aerotech, Inc. -

http://www.aerotech.com

"Dedicated to the Science of Motion"

 

[bert71]

Thank you for your reply.

I checked the Website of baldor and there was a lot of technical data which I could use. I haven't read all of it but think it is likely that I can make some interpolations.
I curious, does there also exist a book (with not to much differential equations) about lineair motors?
Nevertheless the hint to the baldor website was a very good one.

Thank you.

 

[TheDOG]

You may also want to try a company in the US called Anorad:

http://www.anorad.com

 

[SERVOCAM]

We have a little book on linear motors...but do not cover Linear Induction really. Visit all the linear motor mfgs and see what they have on their sites and do a few searches on the web for some articles. The first 7 are the ones that make thier own motors, the rest do not.

1. Aerotech (me)
2. Anorad
3. Trilogy
4. Kollmorgen & NEAT
5. Etel
6. Baldor
7. Copley (old LDL)

8. Parker Daedal
9. Bayside
10...more out there



Cameron Anderson - Sales & Applications Engineer
Aerotech, Inc. -

http://www.aerotech.com

"Dedicated to the Science of Motion"