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Joined: Feb 2004
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Super Hero
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Super Hero
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No need to run them in now, then. The manufacturer should have done that in the first place! Don't people know anything these days? frown


If you don't inspect ... don't expect.
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Master
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Master
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No when they is from Manchestoor


Dr Gazpacho Von Hovercraft is available for consultation
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webbie Offline OP
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They have brushes on there motors still for suction pumps? I thought they went out with the Arc, sorry Noah.

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Sage
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Sage
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Brushless!


Make the impossible POSSIBLE. I know we all can and it is the wisdom to distinguish one from the other.

My blog: http://biomedicalengineeringconsultancy.blogspot.sg/

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Super Hero
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Super Hero
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Cost! smile


If you don't inspect ... don't expect.
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Master
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It may not have been brushes (I can't remember my commutators from my squirrel cages these days nevermind B vs phi graphs!), it was all the materials in the pump were new and stiff and needed a good old run-in like an old motor car. Not had a problem since and the company ensure they are run on and off load before giving them the ok to be sold


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Super Hero
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Super Hero
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It could also have been, of course, "ingress" of all sorts of unmentionable er, debris! whistle

I would expect a universal motor (that is, a series-wound commutator type) in most low-end mains-powered suction pumps, by the way. But I guess that, in this thread, we are basically talking about simple battery-powered portable suctions units. And therefore, simple DC motors, with commutators and brushes.

Brushless DC motors are around, of course (you find them, for instance, in 3.5" floppy disk drives) ... and they are essentially permanent magnet AC motors. But they require the added "complication" (read as cost) of the controller circuitry.

But (just in case there's anyone reading who hasn't already noticed), where the brushless DC motor has really "taken off" is in the realm of flying model aircraft (yes, that was a pun)! smile


If you don't inspect ... don't expect.
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Master
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Master
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you must have gone to those lectures with the chaps from GEC that I "missed" smilewink

Last edited by Gazpacho; 25/06/09 10:57 AM.

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Super Hero
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Super Hero
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What's that ... the one about debris? smile

I can't remember the last time I attended a lecture. But it must have been something like thirty years ago!

It's just that I'm interested in motors ...

... also:-

Anaesthetic Agents
Batteries
BlueTooth
Computer Code
Disk Drives
IDE
EPROM's
Filters
FireWire
Fuses
Lamps
Lubricants
Medical Gases
Membranes
Memory Cards
Operating Systems
PCI
Pumps
SCSI
USB
Wi-Fi
X-Ray Tubes ... etc., etc., etc.


If you don't inspect ... don't expect.
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Master
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Just music, beer and motorbikes for me now cool


Dr Gazpacho Von Hovercraft is available for consultation
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