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61
Electronics / Re: Arduino and motor battery
« Last post by MarkyMark on April 09, 2014, 07:55:58 AM »
Thank you.  If the preferred is separate wires, does that mean that ideally it would have separate batteries?
62
Electronics / Re: Arduino and motor battery
« Last post by waltr on April 09, 2014, 07:50:53 AM »
In theory yes, in practice how you wire from the boost converter to the Arduino and motor driver is important.
What you want is separate set of wires to each but since these motors do not draw much current you shouldn't have much problems. So give it a try.
63
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by thandar on April 09, 2014, 05:45:04 AM »
well budget isnt a problem at this stage  :P
about specifications the things I rly care about is high torque, low voltage and as small size as possible. I've calculated that Power of 150W-200W would be efficient. Im open to suggestions
64
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by venturemfg on April 09, 2014, 05:02:57 AM »
you can find many. All you need is to decide on budget and specifications.
65
Electronics / Arduino and motor battery
« Last post by MarkyMark on April 09, 2014, 02:16:50 AM »
Sorry, probably been asked 1,00 times before!

I wish to power two micro 6v motors.  I am using a  Polymer Lithium Ion Batteries - 1000mAh 3.7V  battery and a Pololu Adjustable Boost Regulator.  Can I use the output to power both the motor and the Arduino Due board or do I need separate battery for the board?

Thanks in advance
66
Software / Basic stepper motor control (Arduino Uno and 28BYJ-48 steppers)
« Last post by StanD on April 08, 2014, 04:50:25 PM »
A while back I "discovered" stepper motors, when my eBay package with 2 little 28BYJ-48 steppers and 2 ULN2003 drivers arrived. Given a total price of less than $8 shipped, I figured there is not much to loose. I have to say that I am quite impressed with the result. Steppers, even cheap ones like these, seem to be great for small robot projects where you want some more accuracy in performance, but do not want to implement a complex closed loop systems with wheel encoders, accelerometers and gyros. Here is a quick video of the result:

StepperBot: 28BYJ-48 Stepper Motors, UNL2003 driver and Arduino Uno


I posted more details, wiring diagrams and Arduino code (using the AccelStepper library) on my blog:
http://42bots.com/tutorials/28byj-48-stepper-motor-with-uln2003-driver-and-arduino-uno/
67
Electronics / Re: Sending emails
« Last post by vipulan12 on April 08, 2014, 04:24:09 PM »
alright, thanks for the links
68
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by thandar on April 08, 2014, 11:23:58 AM »
at first thanks for the immediate response.

speed isnt a problem for me, I wouldnt mind to get that torque even at 3rpm or 1rpm as u said. Im looking for bldc cause I wanna have the motor as compact and light as possible. and I wanna keep the voltage low cause Im planning to use batteries to power the robot
69
Mechanics and Construction / Re: high torque-low voltage geared BLDC motor
« Last post by jwatte on April 08, 2014, 10:22:29 AM »
For equipment as heavy duty as 500 Nm, you will not find "hobby" style stores that carry these.
You will have to look at industrial supply companies that specialize in motion control.
Also, for that level of torque, you may need to look at AC induction motors, as permanent magnet based motors may not be available that can achieve that.

How fast do you need the shaft to spin at? Achieving 500 Nm at 1 rpm is going to be a lot simpler than achieving 500 Nm at 100 rpm!

It may be that the power you need requires you to go to electric vehicle type motors. These typically require drive voltages higher than 24V -- the Nissan Leaf runs at 400V, and has 280 Nm of torque. But, again, what speed you need is an important factor.

Places that sell this kind of equipment can be found on Google -- just look for "motion control."
Expect to spend many thousand dollars for the motor, and as much more for the control/inverter circuitry.
70
Mechanics and Construction / high torque-low voltage geared BLDC motor
« Last post by thandar on April 08, 2014, 09:39:11 AM »
hey everyone,
Im designing a robotic arm and looking to combine a 12V or 24V bldc motor with a suitable gearbox in order to give me torque up to 500Nm. Do u think thats posible? if so can u suggest any particular geared motor?
I dont know if it is allowed in this forum but can u also suggest me some online shops for motoros and gearboxes? thanks in advance  ;)
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