Learning Electrics

[Don T.]

I'm a retired nitro outrigger guy (1977 thru 1984) trying
to figure out these electrics from searching the Q&A.
" You've come a long way baby!" However, I'll bet nitro
smells a lot better than burned electronics, which is the
reason for some of my questions.

From what I see, it looks like a brushless motor is the way
to go in P hydro or 1/12 scale hydro and the ones that come
to mind are the Aveox 1412/1.5 or Hacker (not sure which
one- B50-9L"?").

I also have noted that you can run the Aveox with a
Sensorless ESC without connecting the sensor. How
does this effect the the performance and what does
a sensor do anyway?

What ESC's would easily handle these two motors on 12 cells?

Would a parllel to series switch be just as good?

Should you cool the can on a brushless?

Any input would be appreciated.

Thanks Don Templeton

[AndyKunz]

The sensors on a bl motor are Hall-effect switches. It tells the controller the position of the armature in the can. The controller uses this information to send a new set of voltages to the FETs, effecting what is known as "commutation."

In a sensorless motor, the Hall sensors are eliminated. Instead, the controller senses the current flowing in each winding, and uses that information to commutate at exactly the right time.

In a sensored motor, the timing is fixed in the same sort of way it is in a brushed motor. In a sensorless motor, the controller is continually optimizing the timing to fit the load at any instant. At least, that's possible. Usually they cheat a little, but they are still able to get more accurate timing out than is effected by the Hall sensors.

Andy

[Ray Bidwell]

So Andy why can you use a sensorless esc with a sensored motor. Does not the esc need the info sent from the sensors.

[KevinW]

[In a sensorless motor, the Hall sensors are eliminated. Instead, the controller senses the current flowing in each winding, and uses that information to commutate at exactly the right time.]

The sensorless controller only uses the three power wires (required on either motor) to collect the data it needs.

Kevin W.

[Avenger]

WAY WAY WAY over my head!

[Don T.]

Actually, it all makes very good since to me!

"At least I'm pretty sure it does."

Thanks Andy & Kevin!

Now, if someone can give me answers to
my other questions it would really help.

Don Templeton

Don let me see if I can help you with some of your other questions. Hacker motor for 12 cells would be a B50 XL7 or 8. Be careful if you go to the 7 though. Start with small props and don't try running more than 5 laps. Aveox 1412 1.5Y is also a good choice and of course there are brushless motors but Hopf and Lehner to consider also.

Controllers, because you said easily can handle 12 cells I say either the Schulze WO105 or the new Hacker Master 99. When it comes to cooling normally the controllers are cooled but most of us are not cooling the motors. I have found no ill effect by not cooling the motors but I highly recommend cooling the controller.

Hope this helps some.

Larry

[Don T.]

Larry,

Thanks for the great information. I think that will do it
for the time being.

Thanks again

Don T.