Stabilizers for Blue Angel, engineering question [Archive] — Page 2 — Yachting and Boating World Forums | Boats and Yacht Catalog

Stabilizers for Blue Angel, engineering question [Archive] — Page 2 — Yachting and Boating World Forums

21 мая 2014 | Author: | No comments yet »
Benetti 30M

While sitting on the fence, (well actually in my car on the way home from SOF)

I just want to add a small comment to the discussion;

I m sure that there might be wrong wording, or wrong interpretation from my side, in my posts;

with my limited knowledge of the subject, and me nor mr CMC are native English speaking.

Or that small important details are lost somewhere (the devil is in the detail 🙂 )

f.e. in the discussions above, is many times referred and contested that the speed of the electric fins is a advantage,.

So now I have to say, that when I referred to the faster reaction of the fins to Mr. CMC as being an advantage,

he answered its not really the speed of the fins, but more important, the usage of the very high Q accelerometers (3pcs) and the processing power behind which is the power in the system. (detecting variations or acceleration in the roll movement)

Again, I don t want to go in discussion about these details, just because I don t know much about brushless electric motors nor stabilizers, but I don t think it makes sense to discuss the quality s of CMC without knowing accurate details.

Nevertheless, I know for sure that the moving speed of the electric fins is higher then their hydraulic fins. I don t remember where, but I have read accurate rotating speed figures from the CMC electric fins, in comparison with their hydraulic fins. (something like 25% faster iirc)

But again, I can t explain if or why this could be a advantage, and don t want to.

About the heat issue, my observation is very simple:

CMC states there is absolutely no problem, in none of their systems,

Benetti 93

I will be using the smallest system with the smallest fins (they have two bigger sizes of fins available for the same motor)

and most systems / motors are installed in a watertight box, not in BA,

(I can t even see heat sink ribs on these DC motors, like the ones you know from average AC motors.)

So my conclusion is that I don t expect issue s with heat.

As there is no alternative for CMC, (in my case) I m about to order a system.

Bart, this is a really interesting thread, and you are getting all sorts of opinions, which if like mine, are quite uninformed. Some, like JFM and MM have good experience with other systems, and some of us have an engineering background (JFM qualifies on both counts).

However, it really makes sense to me, that if the system has good sensing and control properties, then it should work better than without. However, I can’t believe an electric motor system is fundamentally more responsive than a hydraulic system, as there is more inertia in the electric motor and gearbox. I still struggle with the info you have from CMC that the motor does not generate heat. The magnetic flux, and electrical energy in the electric motor will always generate heat, brushless or not. As JFM has tried to explain, holding the motor in position against a restoring force will generate heat through the resistance in the windings. My analogy is to consider you are trying to stop your car from rolling down a hill, you are backs to the wall, holding the car in place. You are going to feel mighty hot after a while, even though the is no motion or kinetic energy.

Anyway, the bottom line is that you are going ahead, and I look forward to hearing about the results in due course.

Benetti 93

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