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[Equipment] Inside View of a ResMed S9 CPAP Machine
#31
I got to thinking about how a 3 phase DC motor worked and found this Youtube video.

Note the motor has 3 wires, and there are 6 switches (transistors.) I was having a little trouble picturing this.
Get the free SleepyHead software here.
Useful links.
Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
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#32
(02-06-2013, 04:51 PM)archangle Wrote: Note the motor has 3 wires, and there are 6 switches (transistors.)

Arch,

Those are actually some type of switched diodes to direct the energy (one-way) to the coils, a transistor is a voltage amplifier with 3 connections each (base, emitter & collector).

The video's design schematic is for a hybrid car motor control.
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#33
(02-07-2013, 02:24 AM)TheWerkz Wrote:
(02-06-2013, 04:51 PM)archangle Wrote: Note the motor has 3 wires, and there are 6 switches (transistors.)

Arch,

Those are actually some type of switched diodes to direct the energy (one-way) to the coils, a transistor is a voltage amplifier with 3 connections each (base, emitter & collector).

The video's design schematic is for a hybrid car motor control.

It's an idealized diagram of how a 3 phase DC motor works. CPAP machine or hybrid car, the principles are the same. It doesn't matter whether the switching elements are mechanical switches, Thyristors, or FET transistors like the S9 uses.

The schematic shows mechanical switches as the switching element. No one's going to build a 3 phase DC motor controller with mechanical switches these days for use in actual production. "Switched diodes" would have a different symbol on a circuit diagram. The diodes are "snubber diodes" used to keep arcs from developing across the switch when the switch opens while driving the inductive load of the motor. (Plus some other more complicated reasons.)
Get the free SleepyHead software here.
Useful links.
Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
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#34
You guys are talking way above my head, for sure. Cool

I have a challenge for you...

Say "Wire Wound Resistors" outloud 10 times fast...

We'll see if your verbal skills matches your mental skills. Bigwink Too-funny
SuperSleeper
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#35
(01-24-2013, 05:33 AM)archangle Wrote: [quote='2Tim215' pid='27861' dateline='1358831133']
... gray square thing labeled 173-086 1026 ...

BZ1 (printed on board next to component) - probably "Buzzer 1" ( see: www designation-systems net/usmilav/electronics.html )

173-086 - white square package, 4 holes near corners
last 4 digits - varies on other units - probably date code YYww - YY=year - ww=week within year.
Probably Intervox surface mount buzzer by International Components Corporation.
see: www icc107 com/inc/Intervox_catalog/main_icc_cat.pdf ,
picture 1 at "Surface Mount Piezo Buzzers", "audible devices" -
picture 2 at page 8, Surface Mount Piezo Buzzers, diagram for BSP1602SM-GW Series


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#36
If you do decide to open one of these up and explore, just be extra careful not to stress any wires, tubings or tubing receptacles as those parts are very easy to break. I can imagine getting specific replacement parts for these units would be harder than pulling teeth and you would have to have some connections to obtain replacement parts for the internals of your CPAP machine. So work slowly, be sure you have adequate lighting so you can see clearly what you're moving around, and before you disconnect something like a connector or a tubing be sure and mark it in such a way that you will later know where it is to go back when you reassemble your unit.

Another suggestion I would offer for first-time explorers and the curious, opt for an expendable CPAP unit to disassemble as opposed to taking apart your good unit that you rely on for your therapy.
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