[PSUBS-MAILIST] PLC Choice

Sun Mar 11 21:48:10 EDT 2018

Steve,
some information in case it helps.
you might have heard some of this from me before, but I have been oil filling 
the thrusters. I started with the Saite motors but a few things went wrong
that were possibly my fault. 
   Firstly I didn't have an oil compensator to create an over-pressure & the
oil was moving up the wiring tube when I started the motor. Possibly the
motor design was creating force that was doing this, or centrifigal
force inside the motor was throwing the oil out.
The oil I was using was degrading the main wire insulations & I suspect
dissolved the glue on the sensor board. They glue the sensor board at Saite
with a glue that can be melted so you can adjust the timing of the motor.
   I suspect the timing went out & it overheated, or it overheated first & 
caused the sensor board to come loose. It stopped running after
30 hrs. 
   I had replaced the propellor shaft with a 316 shaft that I turned down so that I had
12mm to fit the prop & 8mm through the motor. I didn't pay enough attention
to getting the press fit right. The whole bell is attached at that one press fit
point. I think I should have heated up the bell a bit & frozen the shaft & 
pressed it in a press, however would need to be weary of splitting the aluminium.   
The result of the not so tight fit was the bell moving off centre in time, this seemed 
ok when running at speed but would scrape at slow speeds. I had looked around
for a suitable motor with a can bearings like the Turnigy 6374 but not sure if
this is necessary. 
   Tested it out with a 2hp yamaha prop & was getting as good as or better thrust
than the average thruster that I had information on was achieving. Have a number
of props to try out. 
   Next step is to build another thruster housing for the Maytech motor, make a new 
test jig & order a plc to control the tests. 
   One reservation about the Maytech motor is I may have to drill angled holes 
in the end of the bell to cause an oil flow across the windings, or add a small
impeller to do the same.
Are you oil filling? 
Cheers Alan

Sent from my iPad

> On 12/03/2018, at 1:36 PM, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi Alan,
> Hah!  That's the same motor that I ordered - should have checked with you first (1 @ 60Kv and another at 70Kv).
> 
> Yes I'm a big fan of the temperature sensing, and the sensors are nice for FOC control (quieter at slow speeds).
> 
> Cheers,
> Steve
> 
>> On Sun, Mar 11, 2018 at 3:32 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Thanks Steve,
>> any information on them is helpful.
>> Perhaps Maytech are putting out the Vesc with heatsink as a result of problems!
>> Not sure if this instigram link works but it is a preview of the Vesc...
>> https://instagram.com/p/Bd2GOBLA1rU/
>> I bought 6 x 6374 sealed sensored outrunner motors off Maytech that I had them wind to 60kv.
>> They have a temperature sensor on the hall sensor board that the Vesc reads, which
>> will be handy for testing. Am running these in oil.
>> They are using these motors on electric surfboards. The wiring isn't as stiff as the "Saite"
>> motors I tried. 
>> Cheers Alan
>> 
>> 
>> 
>> Sent from my iPad
>> 
>>> On 11/03/2018, at 12:48 PM, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>>> Hi Alan,
>>> Yes I looked at the Maytech VESC builds (and have also ordered a BLDC motor sample from them), but the e-skaters do have a few negative things to say about it.  I've been testing a "E-SK8" version I got from Hobbyking and it's been completely fine, but the FOCBox has all round excellent reviews and looks the part - I'd rather pay a bit more for something so critical (and I want to be able to use FOC control too).  Since I'll be on-selling, hopefully I can get much better than list pricing - I'll let you know if I'm doing a bulk order.
>>> 
>>> Cheers,
>>> Steve
>>> 
>>> 
>>> 
>>>> On Sat, Mar 10, 2018 at 1:37 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>> Steve,
>>>> thanks thats good to hear. 
>>>> I bought my Vesc from Maytech in China. They sell them along with a remote
>>>> controller for skateboard use. They look like they have done a good job, &
>>>> if they haven't you'll hear about it from the Skateboarding community.
>>>> My Vesc cost about $100- & they are about to release a Vesc with heat sink
>>>> in an aluminium housing.
>>>> The Vesc Maytech sent me needed the firmware updating, & then I had to order
>>>> an ST link from them to update the firmware. They sent the wrong wires with it.
>>>> Apart from that, I have been buying bldc motors from them that are good quality.
>>>> Will let you know when they release this & what the price is if you like.
>>>> I was looking at the focbox, it looks like they have done a good job with it.
>>>> Cheers Alan
>>>> 
>>>> 
>>>> Sent from my iPad
>>>> 
>>>>> On 10/03/2018, at 10:04 AM, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>>> 
>>>>> Hi Alan,
>>>>> I've also been using the VESC brushless motor controller (I use the FOCBOX type, which is sold in Australia) for diver propulsion vehicles and they are fantastic, with all their diagnostics and open source firmware. They also can have a Bluetooth module added so everything can be monitored on a smartphone app (Android).
>>>>> 
>>>>> Cheers,
>>>>> Steve
>>>>> 
>>>>> On 10 Mar 2018 6:23 am, "Alan via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:
>>>>> Cliff, Steve, (mainly)
>>>>> just an update on where I am with the plc choice.
>>>>> Even though I had done a plc programming course I was getting totally
>>>>> bewildered with all the I/Os & what sort of information I could extract
>>>>> from my motor controller, BMS etc. Have bought a Vesc which is a small electronic
>>>>> brushless speed controller that can read rpm, amp draw & temperature from my
>>>>> motors. I have over 60 I/Os & most are analogue.
>>>>> I ended up contacting an electrician specialising in industrial automation
>>>>> who is also an electronics geek. He is young enough to be up on all the latest
>>>>> technology. He is coming up with all sorts of ways of reducing the I/Os using
>>>>> raspberry pi etc.
>>>>> So glad to leave it in his hands; will see what he comes up with.
>>>>> Alan
>>>>> 
>>>>> Sent from my iPad
>>>>> 
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