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31
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by jwatte on April 10, 2014, 02:09:50 PM »
I think you're right -- I had the rpm/omega conversion wrong. That takes the necessary gearing to something like 3000:1 (depending on the RPM of your motor.) With a gearbox that an withstand 540 N.m. That's into performance car/motorbike territory...
32
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by thandar on April 10, 2014, 11:40:44 AM »
at first thank you all for you answers
@ tommy even if torque was sufficient this kind of mechanism doesn't fit with my designs. ofc its my fault cause I haven't made clear the exact purpose of my arm.

@jwatte I used this formula (Torque (N.m) = 9.5488 x Power (kW) / Speed (RPM)) for my calculations but there is a possibility to have been misguided :P what u think?
33
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by jwatte on April 10, 2014, 10:11:50 AM »
Quote
theoretically a 200W motor rotating with 4rpm could give about 480Nm

That's not what my math says, but my math could be wrong. Could you show your formula so I could figure it out?
34
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by gerard on April 10, 2014, 09:04:18 AM »
Quote
if so can u suggest any particular geared motor?

thandar, not sure about your application, but I'v had a notion of using these type motors(link below)
with an electric brake(a must for that type application) and encoder(also a must have) for an arm type device.

http://www.robotmarketplace.com/products/NPC-B81HT.html


Tommy

this motor barely passes 100Nm
even heavy duty ampflow gearboxes ahave a failure point of 400Nm

for 500Nm you will need some industrial grade motors and gearboxes
nothing even close to light 'light'
35
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by Tommy on April 09, 2014, 04:07:52 PM »
Quote
if so can u suggest any particular geared motor?

thandar, not sure about your application, but I'v had a notion of using these type motors(link below)
with an electric brake(a must for that type application) and encoder(also a must have) for an arm type device.

http://www.robotmarketplace.com/products/NPC-B81HT.html


Tommy

 
36
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by thandar on April 09, 2014, 12:25:55 PM »
well theoretically a 200W motor rotating with 4rpm could give about 480Nm. That would do  :P
but as u said I cant find such a gearbox on the shelf...
should I use harmonic drive instead of a planetary gearbox??

thanks for the advice, I'll check the automotive industy and review the AC induction motors
 
37
Electronics / Re: Arduino and motor battery
« Last post by MarkyMark on April 09, 2014, 11:44:44 AM »
Thanks all. Ok I'll put a 2nd battery to safe. What's the easiest lightest battery that will power the due?
38
Electronics / Re: Wild thumper controller
« Last post by Han on April 09, 2014, 11:11:43 AM »
also, there is no error. there is simply no response at all.
39
Electronics / Re: Wild thumper controller
« Last post by Han on April 09, 2014, 11:07:14 AM »
as the user manual states:


Using either a PC and the USB port or another proc
essor connected to D0(RX) and D1(TX) the sample
software will support these
basic serial commands:

“FL” flushes the buffer. This occurs automatically on power up and if an invalid command is received.

“AN” request analog data. 10 bytes will be received, The “high” and “low” byte of analog inputs 1-5.

“SV” followed by the “high” and “low” byte of 7 servo positions in uS. 14 bytes must be sent.

“HB” followed by 4 bytes of data sets the mode (0-2) and power (0-255) of each “H” bridge.

hence, as i understand it, i am supposed to type into the serial monitor the following to make a motor move:
"HB2200"
and then click send.

i have also tried:

HB
send
2
send
200
send

as well as
HB 2 200
send

and
HB
send
2200

to no avail. it is the sample code on the sparkfun site, and i have set it to serial mode, as instructed. still, i am completely lost.
40
Electronics / Re: Wild thumper controller
« Last post by jwatte on April 09, 2014, 10:53:48 AM »
When you say "it doesn't work," what are you trying, and what is the result?
If you can copy some lines of code and some lines of the error messages you're seeing, that might help.
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