RE: Tape drive motors

Posted by tomservo (M) on April 6, 2023 at 07:41:45

In Reply to: RE: Tape drive motors posted by Scholl on April 2, 2023 at 05:38:04:

Hi
I searched Google Patents but only found the Canadian patent for that.

The evolution of that was the commutated voice coil idea, then the Servodrive (the rotary version of the commutated coil), then the full rotary woofer and motor, the Phoenix Cyclone was an example made under license.

The attached picture was part of a "large" one of those full rotary drivers. 8 of these were placed at the exit of a 20 foot diameter cooling fan at the Redondo Beach nuclear power plant to cancel the low frequency fan noise.
Each of those had the displacement of 6x 18 inch woofers moving an inch peak to peak. The noise canceling system was in place for about 2 weeks before the earthquake knocked the power plant off line for good

https://patents.google.com/patent/US4531025A/en?q=(tom+danley+subwoofer)&oq=tom+danley+++subwoofer&page=1

https://patents.google.com/patent/CA1199875A/en?q=(tom+danley+subwoofer)&oq=tom+danley+++subwoofer&page=1

https://patents.google.com/patent/US4763358A/en?q=(tom+danley+subwoofer)&oq=tom+danley+++subwoofer&page=1

https://www.diymobileaudio.com/threads/phoenix-gold-cyclone-12-in-rotary-subwoofer-rare-working.453370/

I was thinking, i might have something like the motor you mentioned, I think it was from a very old hard drive memory, i mean old!. This was maybe a 6 or 7 inch square alnico magnet and a 4 inch voice coil made of very heavy rectangular wire. There were two rods that guided the VC. Somewhere in my old house i have that and intend to pick it up when i finish moving.

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Follow Ups Full Thread

Topic - Help with identifying horn sub - KanedaK 00:30:26 03/26/23 (26)

RE: Help with identifying horn sub - Alpha Al 18:39:00 03/28/23 (3)

RE: Help with identifying horn sub - claudej1@aol.com 12:52:41 03/29/23 (2)

Notice I sail CAB, not SUB nt - Alpha Al 16:36:55 03/29/23 (0)

RE: Help with identifying horn sub - Bill Fitzmaurice 14:02:21 03/29/23 (0)

RE: Help with identifying horn sub - KanedaK 03:23:57 03/27/23 (1)

Twin Tubas work for me... - Ivan303 07:11:34 03/27/23 (0)

RE: Help with identifying horn sub - tomservo 07:05:21 03/26/23 (17)

RE: Help with BT7 - claudej1@aol.com 08:40:37 03/26/23 (16)

RE: Help with BT7 - tomservo 16:20:36 03/26/23 (15)

Servo Drive for sale - Scholl 13:17:49 04/05/23 (2)

RE: Servo Drive for sale - tomservo 07:27:08 04/06/23 (1)

Someone bought them NT - Scholl 06:47:10 04/07/23 (0)

Tape drive motors - Scholl 06:31:57 04/01/23 (7)

RE: Tape drive motors - tomservo 07:29:12 04/01/23 (6)

RE: Tape drive motors - Scholl 05:38:04 04/02/23 (5)

RE: Tape drive motors - tomservo 07:41:45 04/06/23 (4)

PS: Thank you for the links. - Scholl 12:59:08 04/09/23 (0)

RE: Tape drive motors - Scholl 06:38:28 04/09/23 (1)

RE: Tape drive motors - tomservo 10:53:59 04/10/23 (0)

RE: Tape drive motors - claudej1@aol.com 08:29:23 04/08/23 (0)

RE: Help with BT7 - claudej1@aol.com 21:23:23 03/26/23 (3)

RE: Help with BT7 - tomservo 12:35:34 03/28/23 (2)

RE: Help with BT7 - claudej1@aol.com 14:15:43 03/28/23 (1)

RE: Help with BT7 - tomservo 11:00:46 03/31/23 (0)

Maybe hd 15 from Roger mogale - merdy 06:04:40 03/26/23 (0)

RE: Help with identifying horn sub - Bill Fitzmaurice 05:29:19 03/26/23 (0)

Follow Ups

RE: Tape drive motors - tomservo 07:41:45 04/06/23 (4)

PS: Thank you for the links. - Scholl 12:59:08 04/09/23 (0)

RE: Tape drive motors - Scholl 06:38:28 04/09/23 (1)

RE: Tape drive motors - tomservo 10:53:59 04/10/23 (0)

RE: Tape drive motors - claudej1@aol.com 08:29:23 04/08/23 (0)

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