Team Shakesc : Build Diary

[Ellis]

I bought one a while ago, and an ESC, only just now getting to the point of using them in a bot. The lack of stock is indeed worrying.

As in-depth as you can make the videos would be brilliant, in terms of what you are actually doing on the transmitter and how it reacts. Otherwise impossible to tell what is controlled and what is accidental!

[shakesc]

Feel the need to message them on this. Motor + this service makes it a lot more expensive

[shakesc]

So ran some testing
Unfortunately 1 motor is running sensored and the other will only run unsensored

All driving tests were done with the motors unsensored

Acceleration


Also youtube
Probably got to around 3/4 stick before impacting the door

Its not lacking in power and all tests I've done I've been impressed by the power these motors can give.

Control tests


Generally controllable but the garage floor isn't very smooth so its not a great surface to do test drives. It gives some demo of forward / reverse
Stick movement isnt too large

Run up test without sensor on both motors

Minimum stick movement to get motor rotation to full stick

Run up test with sensor on left hand motor

Minimum stick movement to get motor rotation to full stick

and youtube


The big difference is the low speed. With the sensor the low speed start up is slower and more controlled

[Flag Captured]

It does, and the smallest is 50mm, however I don't know if the 30-something quid it costs includes the motor itself...

Failing that, it does list the exact sensor used within the motors - I certainly wouldn't try it myself but I guess there's the possibility of adding those kind of sensors to any other outrunner, if it comes to it?

[Eventorizon]

Feel the need to message them on this. Motor + this service makes it a lot more expensive

I would guess they have spotted a market and they are doing this to increase profit. Can't blame them really, its a very hard and specialised thing to do, especially if they are milling into a motor. If they mess up its going to cost them a lot.

[harry hills]

Dude fix your trims lol One motor starts a long way before the other when you're driving it around

[Mega Masher]

Just asking, in the second video I saw a blue welder. Which type or model is it?

[shakesc]

I certainly wouldn't want to attempt this myself. Want I do want is a reliable supply of sensored outrunners - I'm coming away from using speed 900's due to supply issues (out of the frying pan into the fire!)

I've messaged them and will post the response

[overkill]

Interesting how one of your motors doesn't run properly - its almost the same situation as I had. Did you go through the routine of testing all the phase combinations on each motor? The custom sensor service is expensive when their standard sensored 50mm motor is 47 pounds including the motor. As they mention a large range of motor sizes, I doubt the one price includes the motor itself.

[Ellis]

Cheers Chris. The acceleration footage seems to drop a load of frames - you able to see if a reupload would fix that? Perhaps to YouTube; photobucket's video support is notoriously pants.

Also, in the general drive video, it looks very much like one side starts before the other, and at random. This is typical of sensorless brushless drives with low reduction. Can you confirm if it's transmitter inputs causing how the robot is behaving or if it's the drive? I realise it's a small space but the control looks very lumpy.

Finally, in the on-the-bench testing, one motor starts way before the other. Is that trims? It's very marked!

edit: oh and in the acceleration test, it hits the door, and judging by the squeal, the motor stalls and doesn't get going again? Not promising if it can't defeat the (admittedly high) grip of the tyres on the rough surface.