Topic: Brushless ESC with INSTANT reverse??? (Read 14341 times)

RyanB · « **on:** October 06, 2011, 06:53:33 pm »

Does any one know of a brushless ESC with instant reverse option and not stupid money???

barriew · « **Reply #1 on:** October 06, 2011, 07:10:13 pm »

Check up this post - http://www.modelboatmayhem.co.uk/forum/index.php?topic=31935.0

I have one of these which I am putting in the Kitshack RTTL. It will get its first outing on Sunday. Mine's 60amp, but there is a range of them. No sure if they are Chinese amps though, although I don't expect to need more than 20A

Barrie

RyanB · « **Reply #2 on:** October 06, 2011, 07:15:14 pm »

Thanks Barrie, I have had a good look and will bare them in mind, can you let me know how it runs? I am trying to avoid having to blip reverse before you actually get reverse.

barriew · « **Reply #3 on:** October 06, 2011, 07:19:52 pm »

Quote from: Ryan on October 06, 2011, 07:15:14 pm

Thanks Barrie, I have had a good look and will bare them in mind, can you let me know how it runs? I am trying to avoid having to blip reverse before you actually get reverse.

I know what you mean - I have both a Hobbyking and another from Giantcod which claim to be instant reverse, but I can't get them set up to operate that way. I bought the program card for this one. When I tested the set up (dry) yesterday, I could only get it to go forward, but I didn't check the programming or the Tx set up as that was not the object of the exercise

I'll let you know how I get on.

Barrie

xilsoe · « **Reply #4 on:** October 06, 2011, 07:37:16 pm »

The Robbe ROXXY 9XX series has instant reverse. Expensive though.

http://www.conrad.de/ce/de/overview/7107106/SchalterRegler-fuer-Robbe-BL-Motore

RyanB · « **Reply #5 on:** October 06, 2011, 08:30:40 pm »

Cheers Barrie, look forward to hearing about them

john s 2 · « **Reply #6 on:** October 06, 2011, 11:00:00 pm »

Purely out of interest. How does a motor spinning at say 30000 rpm take to being put straight into reverse? it seems to me to not be a good idea or am i wrong? John.

HS93 (RIP) · « **Reply #7 on:** October 06, 2011, 11:07:16 pm »

Quote from: John s on October 06, 2011, 11:00:00 pm

Purely out of interest. How does a motor spinning at say 30000 rpm take to being put straight into reverse? it seems to me to not be a good idea or am i wrong? John.

Defiantly not good especially with the torque of some brushless motors, hope you prop is welded on

Peter

dondecap · « **Reply #8 on:** October 06, 2011, 11:24:44 pm »

hi guys.
instant reverse is 'an impossability'
the esc goes through the brake on its way to reverse so there will always be a delay.
as said above ......you do have spare shafts and props eh?
how long does it take you to go from forward to full reverse then to neutral and down again? to engage reverse
thats the quickest reverse you will get...
even if you used micro switches to 'reverse currant' to the motor it would still not be 'instant'
regards
don

Nige52 · « **Reply #9 on:** October 07, 2011, 08:20:37 am »

I'm pretty sure Ryan means an ESC that operates the same as perhaps an Mtroniks Viper? So you can go forward and then backwards without having to blip the stick downwards twice? A bit like the old fashioned Double de Clutching?

My forward/reverse brushless esc's are a pain in the butt. The one that works the best is the one in my Fairey Spearfish, a 60a Seaking one, but even that is a pain as the Double de Clutching operation is only successful sometimes....in fact I usually have to wait for the wind to turn the boat round as it won't work.....the others I have are worse than useless and the reversing doesn't work at all in a lot of the cases....

dondecap · « **Reply #10 on:** October 07, 2011, 08:30:54 am »

hi guys,
I use a 'rchobbyart' brushed esc.....prob just a generic chinese one :)
I have the throttle centralized with a spring and the 'slide also centralized' .............
this works every time for me .............go from forward to full reverse to neutral and then sail reversed.
this brakes the motor/prop and takes about a second or two to perform the action.
regards
don

Nige52 · « **Reply #11 on:** October 07, 2011, 09:45:23 am »

Won't work with a brushless motor though Don......

Martin (Admin) · « **Reply #12 on:** October 07, 2011, 10:18:44 am »

Quote from: Nige52 on October 07, 2011, 09:45:23 am

Won't work with a brushless motor though Don......

Isn't that what you program into the speed controller?

Also 'back EMF' seems to come to mind from my college days....

dreadnought72 · « **Reply #13 on:** October 07, 2011, 10:22:53 am »

Quote from: dondecap on October 06, 2011, 11:24:44 pm

hi guys.
instant reverse is 'an impossability'

Hi Don.

Certainly is. It'd also break the laws of physics.

The OP is asking that rotational kinetic energy needs to be quelled, instantly. Dividing "joules" by "time" when "time=0" would mean "watts = infinite", presumably causing similar effects to turning the Large Hadron Collider up to 11.

Andy

RyanB · « **Reply #14 on:** October 07, 2011, 10:39:25 am »

This is all getting rather technical, infant on as mentioned a esc that acts like an mtronics, were as you have very little delay and no double clicking! I think I am just going to use 700bb with mtronics esc and 11.1 lipo, should give me enough power for what I need!

malcolmfrary · « **Reply #15 on:** October 07, 2011, 10:41:51 am »

As users, most of us don't care about the exact application of the laws of physics. We just want the thing to work in the way that old fashioned out-dated equipment has been doing for years past. With brushed motors, all that energy has to be dissipated and overcome and reversed, but it all happens with one action of the stick. What is wanted is for the same to happen with brushless motors. It does not need to be directly instant in the dictionary sense of the word, it just needs for a motor, being told to be full forward and going full forward, when the stick is moved to full reverse, to have the motor transition to full reverse in an orderly manner without the faffing about of blipping the throttle.

Martin (Admin) · « **Reply #16 on:** October 07, 2011, 10:51:50 am »

Have you had a look at the MTroniks brushless sets?

http://www.mtroniks.net/products.asp/SubcatID/1/brushless-speed-controllers.htm

Nige52 · « **Reply #17 on:** October 07, 2011, 10:53:12 am »

Quote from: Martin - admin. on October 07, 2011, 10:18:44 am

Isn't that what you program into the speed controller?

Also 'back EMF' seems to come to mind from my college days....

No, I meant that a brushless motor won't work with the one Don suggested....

Martin (Admin) · « **Reply #18 on:** October 07, 2011, 10:57:26 am »

RyanB · « **Reply #19 on:** October 07, 2011, 11:08:46 am »

I have Martin but I don't want to spend that much, it would be over £200 for the power I need!

barriew · « **Reply #20 on:** October 07, 2011, 05:29:29 pm »

Ryan,

Tried again to today but no success. The programmer says it set up for Reverse, but it will only go forward

This is using a Spektrum DX5e. I will try it with my Radio Link 4 and see if it works then, if not its back to Astec I guess. I will probably use a different ESC for Sunday's test.

Barrie

dondecap · « **Reply #21 on:** October 07, 2011, 07:51:08 pm »

hi guys.
I mentioned my setup as an example ....
I know a brushless motor will not run with a brushed controler...... but surly the reverse brushless contolers would be programed to run in the same manner...
forward, return stick to neutral, which is the brake action, carry on through to reverse....on mine I have to go full reverse and return to neutral to switch the reverse on, but this is as said, that action only takes 1 or 2 seconds then you are in 'full reverse' if required ..........motor way braking??????

for this my throttle stick had to be neutral at halfway with the throttle slider/trim at half also.

regards
don

dondecap · « **Reply #22 on:** October 07, 2011, 08:03:03 pm »

hi guys
a cheaper option if you are looking at a large amp controler is the servo and two micro switches to 'reverse currant' between the motor and the esc.....it only needs to swap two wires to reverse rotation.
regards
don

malcolmfrary · « **Reply #23 on:** October 08, 2011, 09:22:42 am »

There should be no need to add a pile of extra hardware, nor should there be any need to use a different method of handling the controls. There is a small computer built into these ESCs, which is perfectly capable of doing the job - it just needs the programmer to do his job properly, then, if he has done so, to persuade the writer of the instructions to express himself in an understandable way. There physical electronic bits are already there, there is a program module looking at the input, there is another module telling the output what to do, it seems that it needs another module in between these to allow the control to happen like it does in the old, outmoded stuff.

barriew · « **Reply #24 on:** October 08, 2011, 09:52:12 am »

Well, I've solved the problem. It is necessary to set up the stop and full speed positions of your Tx using the programmer. Having done so, it now works exactly like an ACTion, Mtroniks or other brushed MARINE controller. No need to double dip or pause at neutral - it goes straight from forwards to reverse. Whether this means my prop will fly off is another matter, but I don't see why it should be any different to any other controller.

Now to test in in the water tomorrow.

Barrie

Malcolm - it was the instructions as usual that were at fault. No mention that this was required, just how to do it not why you need to

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Author Topic: Brushless ESC with INSTANT reverse??? (Read 14341 times)

RyanB

RyanB

xilsoe

RyanB

dondecap

Nige52

dondecap

Nige52

RyanB

Nige52

RyanB

dondecap

dondecap