How a subwoofer motor is built - Car Audio Classifieds!
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Old 03-28-2011, 09:04 PM
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Default How a subwoofer motor is built

I thought I would write up a simple and clear tutorial as to how a subwoofer motor is build. This write up contains no softparts, simple the motor assembly. For softparts I will have a tutorial up in time.

A motor consists of a yoke (bottom plate), magnet/s, top plate, shorting rings can also be included if anyone gets curious and wants to try and build their own.

First off we have a jig to center the magnets. This jig is made with two 1/2" pieces the bottom plate has the OD of the pole piece while the top one has the OD of the slug/s.



Taking a magnet you place it in the jig, due to how magnets are cut sometimes the the ODs are not all the same although the slug will still be round. In this case we can simply shim the magnet so it is centered in the jig.





Now that a magnet is ready to be placed on the t-yoke we can take a t-yoke. Most steel for subwoofers have a coating on them so they do not oxidize. This coating needs to be scuffed so the glue can stick to a solid surface. Some motors will have paint, others use a nickel plating in this case we have nickel plating.



The steel and magnet will bond to one another via a loctite adhesive. I prefer to use Loctite 392 with Loctite 7387 as the primer. Of the two surfaces being connected it does not matter which gets the glue and which gets the primer. For this example I will show the magnet having the primer applied to it.


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Old 03-28-2011, 09:13 PM
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From this point the yoke can be placed into the magnet allowing the plates to connect, and be placed in a press.




Repeat the steps to add more slugs on top of one another.




Now for the tricky part which has the least option of error. Shimming the top plate. I prefer to use a coil of the same size planned to be used on the motor. Place the coil in the top plate with top of the former down like pictured.



Check to make sure the coil can be pushed down nicely, while also not too loose. In most cases a single shim can be used for this.



Have the top plate scuffed as well and place a bead of glue in the center of it.



With primer on the magnets I prefer to use popscile sticks to hold the top plate above the magnets as I apply the outside shims.




Once shims are applied, remove popscicle sticks, and press coil down as you will notice the top plate center itself. Turn the motor upside down and press it for the last time.





As you can see the magnets still have some primer on them, a little acetone cleans them right up.



You now have a perfectly centered gap



Ready for magnetizer, then from there basket and softparts can be applied.

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Old 03-30-2011, 12:27 AM
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Great tutorial man
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Old 03-30-2011, 12:32 AM
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always wondered..great low down on it all
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Old 03-30-2011, 12:36 AM
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Nice write up Bumpin!
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Old 03-30-2011, 12:36 AM
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you want to build me a super motor
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Old 03-30-2011, 12:41 AM
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I would love to see more of this on the site. Details of things we talk about and use every day, how motors are made and stuff. Thanks man! Enjoyed!
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Old 03-30-2011, 12:45 AM
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Quote:
Originally Posted by BassikInstincts View Post
I would love to see more of this on the site. Details of things we talk about and use every day, how motors are made and stuff. Thanks man! Enjoyed!
Me too. Good stuff
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Old 03-30-2011, 12:47 AM
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Bumpin does it all
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Old 03-30-2011, 12:50 AM
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Great read, man! Was actually wondering about this the other day, and here it is. Will be looking forward to your rundowns on softparts, if you can do so.
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