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new Brinkmann belt-drive motor, "Sinus"

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Posted on July 18, 2013 at 12:10:45
caligari
Audiophile

Posts: 415
Joined: March 20, 2008
 It's interesting to know that after the development of the Bardo direct-drive turntable, Brinkmann incorporated the technology into manufacturing their own belt-drive motor to use for the LaGrange and Balance models. It looks like a miniature version of the Bardo motor. Not many manufacturers make their own motors so it's nice to see that a mainly belt-drive company can learn a few things from direct-drive technology. Another interesting thing is that the layout of the coils are symmetrical whereas Bardo's stator coils have a gap. I think symmetry makes sense....... and I can foresee an update of the Bardo...





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The Bardo motor:

 

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RE: new Brinkmann belt-drive motor, "Sinus", posted on July 18, 2013 at 17:42:22
Lew
Audiophile

Posts: 11011
Location: Bethesda, Maryland
Joined: December 11, 2000
 The novelty here is that they are using a coreless motor to drive the belt. It's not merely a "direct-drive" motor, since many types of motor have been used in direct-drive. Dual was the first in the modern era to use a coreless motor in a DD turntable. Their coils were assymetrically placed around the circumference, for reasons I do not fathom. Kenwood basically copied the Dual motor and used it in the L07D. (Around the same time, Pioneer also used a coreless motor in their high end DD turntable, the P3.) Supposedly, Dual brought suit against Kenwood, so Kenwood re-configured their L07D motor in the last run of turntables such that the coils were symmetrically arranged to avoid infringement, just as Brinkmann is now doing. I have no idea whether Brinkmann was motivated by legal aspects or by laws of physics, but in any case, a coreless motor will have virtually no cogging. I am sure that there are at least several other turntables that used coreless motors. I just remembered that the top line JVC/Victor DD turntables, TT81 and TT101 are among them. Would like to know about others.

I also just remembered that the placement of the coils has something to do with the function of the "Hall" speed sensor. You can see it on the new Brinkmann circuit board.

 

RE: new Brinkmann belt-drive motor, "Sinus", posted on July 18, 2013 at 22:13:08
caligari
Audiophile

Posts: 415
Joined: March 20, 2008
Lew: "Dual was the first in the modern era to use a coreless motor in a DD turntable. Their coils were asymmetrically placed around the circumference, for reasons I do not fathom."

Actually, Dual was the one who used symmetrical arrangement of coils in their coreless motor, whereas the copycat, (Kenwood, Brinkmann, etc) motors use asymmetrical coils. Check pictures below.


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Dual EDS-1000 motor, symmetrical coils:


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early version of Kenwood L-07D motor, NOT symmetrical coils:


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later version of Kenwood L-07D with star shaped coils in symmetrical arrangement:

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Sony PS-X9 with NOT symmetrical coils


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Brinkmann Bardo motor with NOT symmetrical coils:

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Another look at the new belt-drive Brinkmann Sinus motor with symmetrical coils:



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Looks like majority of coreless motors since the Dual EDS-1000 have Asymmetrical coil arrangement.

Anyway, it's nice to see the direct drive genre getting some good reps!

I would love to see the innards of the new VPI Direct table.

The more I look at direct drive the more elegant it is mechanically.

 

Agghhhh!, posted on July 19, 2013 at 12:43:24
Lew
Audiophile

Posts: 11011
Location: Bethesda, Maryland
Joined: December 11, 2000
 I think I'm losing it, whatever "it" was. In any case, I love my L07D.
Did you get some of those photos from the "L07D" website? They look familiar. The "late" version L07D is rather rare. There is a certain sense of musical ease I now associate with coreless motor-based turntables, which makes me a big fan of same.

 

RE: Agghhhh!, posted on July 19, 2013 at 16:29:17
caligari
Audiophile

Posts: 415
Joined: March 20, 2008
Lew: "Did you get some of those photos from the "L07D" website?"


Only a couple of them. Good pictures are always found in Japanese sites like amp8.com with very hi-rez images.

Lew: "There is a certain sense of musical ease I now associate with coreless motor-based turntables, which makes me a big fan of same."


I agree. Symmetrical coils or not, all that matters is that coreless motors are musical to the ears. "Musical ease" is a good way to put it. To me it has that belt-drive quality, a sense of flow, but more concise. Good stuff!

 

RE: new Brinkmann belt-drive motor, "Sinus", posted on July 18, 2013 at 15:12:14
6bq5
Audiophile

Posts: 4690
Location: SF Bay
Joined: August 16, 2001
 I have bought many 'shakers' for use in Labs that are made by a German company - previously called VarrioMag that used the coil-effect motor as depicted in both of the examples you cited - an extremely clever solution to certain aspects of the problem...
Happy spinning
Happy Listening

 

RE: new Brinkmann belt-drive motor, "Sinus", posted on July 18, 2013 at 14:16:26
theophile
Audiophile

Posts: 1282
Location: australia
Joined: July 16, 2003
 I might be wrong, but some of the upper end Micro Seiki turntables used a Direct Drive motor for the belt drive.

 

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