WTC Piston Tanks/Motors - Page 4

Lambsy · Nov 11, 2009, 11:12 PM

Quote:

Originally Posted by jaguar75

You can source them out at a computer parts surplus store.They are used for scanning/printing machines and motion encoding machines.

Why did you try to send noobs to subs or motors on a wild goose chase?
What is so controversial about the numbers of cables to each phase and the winding resistance that it needs to be a secret?

Skip Asay · Nov 11, 2009, 11:30 PM

I guess I'll have to repeat one more time -

On another board you stated - "I have this design of the electronics and batteries figured out with the help of VanTech" when asked how you intended getting power, etc. between your 3 WTCs. And your answers were somewhat cryptic. Care to elaborate?

Skip Asay

Roedj · Nov 12, 2009, 12:40 AM

Skip,

I'm thinking perhaps he meant Vantec a supplier of batteries and other computer accessories.

Dan

Skip Asay · Nov 12, 2009, 12:54 AM

Roedj -

You're probably right but, in reality, it's more of a mechanical problem than electrical/electronic. I just don't see any reason why he'll share just so much and then no more. Perhaps he didn't think of that?

Skip Asay

Albion · Nov 12, 2009, 03:06 AM

I'm really starting to put on weight, i guess if i go for the salt popcorn instead of butter it might help

Sub culture · Nov 12, 2009, 05:10 AM

Based on what John posted up on the CNC zone forum yesterday-

'I have been looking at the Allied Motion CM-900 brushless hollow shaft servo encoder motors for driving screw shafts on 3" diameter x 12" length 1,000ml piston ballast tanks for rov submarines.The water pressure inside the piston is 10psi and the total piston travel should be less than 30 seconds.The motor will have forward,reverse and position memory. Has anyone had experience with these types of motors ?'

http://www.opticalencoder.com/hollow...-encoders.html

Basically a large brushless motor with an optical quadrature encoder built in.

Very nice pieces of kit, but at eye watering prices if purchased off the shelf, and there is absolutely no way you need the precision of a quadrature encoder for accurate ballast control. If you're having them built to a custom spec by a manufacturer, then I guess you are purchasing them new? How much?

I have some little 4 watt maxon motors with a 36:1 planetary gearbox. These are swiss-made, with 5-pole armatures and a fully ballraced gearbox with metal gears. They make very little noise in operation (what can best be described as a low purr).

They're about 3/4" diameter by about 2" long (with gearbox) and weigh about 1 1/2 ounces.

They wind about 350 RPM at 24 volts and seem to be unstoppable, torque rating is in the region of 34-35 oz-in.

They cost me about three quid each off of ebay, and these sort of motors crop up on a regular basis. A proportional control board for piston tanks costs about £40-50, or you can grow your own for about half that, add a pound or two for micro switches, wiring, diodes etc.

Now I wouldn't use these on a 3.5" tank, they're a tad on the small side. For respectable dive times of, say 15 seconds, then a 20-25 watt motor would be a better bet.

Lambsy · Nov 12, 2009, 07:20 AM

Baa!
As I suspected,a gearbox will be required in addition to a worm drive because the custom 900 is only 480mNm at rated.
125 lb or over 500N at 10lb per square inch.

Thanks,Subculture.Perhaps you can find the CM-900 equivalent at a computer surplus supplier cause I'm not even going to try/

Nov 11, 2009, 11:30 PM	#47
Skip Asay Registered User Join Date: Mar 2005 Posts: 177	One More Time I guess I'll have to repeat one more time - On another board you stated - "I have this design of the electronics and batteries figured out with the help of VanTech" when asked how you intended getting power, etc. between your 3 WTCs. And your answers were somewhat cryptic. Care to elaborate? Skip Asay

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Nov 12, 2009, 12:40 AM	#48
Roedj Registered User Join Date: Apr 2008 Posts: 23	Skip, I'm thinking perhaps he meant Vantec a supplier of batteries and other computer accessories. Dan

Nov 12, 2009, 12:54 AM	#49
Skip Asay Registered User Join Date: Mar 2005 Posts: 177	Roedj - You're probably right but, in reality, it's more of a mechanical problem than electrical/electronic. I just don't see any reason why he'll share just so much and then no more. Perhaps he didn't think of that? Skip Asay

Nov 12, 2009, 03:06 AM	#50
Albion Registered User Join Date: Jan 2005 Location: singapore Posts: 152	I'm really starting to put on weight, i guess if i go for the salt popcorn instead of butter it might help

Nov 12, 2009, 05:10 AM	#51
Sub culture Man from Atlantis Join Date: Nov 2003 Location: London Posts: 589	Based on what John posted up on the CNC zone forum yesterday- 'I have been looking at the Allied Motion CM-900 brushless hollow shaft servo encoder motors for driving screw shafts on 3" diameter x 12" length 1,000ml piston ballast tanks for rov submarines.The water pressure inside the piston is 10psi and the total piston travel should be less than 30 seconds.The motor will have forward,reverse and position memory. Has anyone had experience with these types of motors ?' http://www.opticalencoder.com/hollow...-encoders.html Basically a large brushless motor with an optical quadrature encoder built in. Very nice pieces of kit, but at eye watering prices if purchased off the shelf, and there is absolutely no way you need the precision of a quadrature encoder for accurate ballast control. If you're having them built to a custom spec by a manufacturer, then I guess you are purchasing them new? How much? I have some little 4 watt maxon motors with a 36:1 planetary gearbox. These are swiss-made, with 5-pole armatures and a fully ballraced gearbox with metal gears. They make very little noise in operation (what can best be described as a low purr). They're about 3/4" diameter by about 2" long (with gearbox) and weigh about 1 1/2 ounces. They wind about 350 RPM at 24 volts and seem to be unstoppable, torque rating is in the region of 34-35 oz-in. They cost me about three quid each off of ebay, and these sort of motors crop up on a regular basis. A proportional control board for piston tanks costs about £40-50, or you can grow your own for about half that, add a pound or two for micro switches, wiring, diodes etc. Now I wouldn't use these on a 3.5" tank, they're a tad on the small side. For respectable dive times of, say 15 seconds, then a 20-25 watt motor would be a better bet.

Nov 12, 2009, 07:20 AM	#52
Lambsy Registered User Join Date: Nov 2009 Posts: 4	Baa! As I suspected,a gearbox will be required in addition to a worm drive because the custom 900 is only 480mNm at rated. 125 lb or over 500N at 10lb per square inch. Thanks,Subculture.Perhaps you can find the CM-900 equivalent at a computer surplus supplier cause I'm not even going to try/