Recent content by bal_jop

At last... Got it working. It is not as heavy a weight, it is only a 300 kg total gross weight, but a working model. Thank you so much @anorlunda and @JBA for giving me some of the design insight.

@anorlunda, Apologies for my late response. In many of the 250 watt motors, I see the torque is in the range of 30-40 N. Please go ahead and post it to DIY forum, you could point me there so that I can continue following up. @JBA, I would prefer the user to stop and start the roller at their...

Thank you so much for staying on. Hub motors are electric BLDC motors, with the stator providing the shaft to mount the payload, and the rotor being used as the wheel. Please check https://gogoa1.com/t/hub-motors Now, What would be the initial torque and power required to move the roller, from...

@anorlunda, Thank you for taking your time to explain. The closest coefficient of friction, I am able to find is; 0.04 - 0.08 car tire on solid sand, gravel loose worn, soil medium hard I took this from; https://www.engineeringtoolbox.com/rolling-friction-resistance-d_1303.html Fr = c *...

@anorlunda, it need not go beyond 10km/hr. Could you explain the friction part?

I am working on a 500 kg roller, which I want to pull using electric motor. I am considering hub motor, since it is easier to frame a basic ev with it. Now I need to know the capacity of the hub motor, I need to choose. Roller weight = 500 kg Frame weight + driver weight = 150 kg speed required...

okay after a long time... I would like to know what is the best limit switch I could use?

hmmm... I am not sure, I am thinking of attaching the turn lever with the shaft of the motor directly. I am a novice when it comes to engineering... but I am going to give it a try... What do you suggest would be a good limit switch?

I want the valve to be either fully open or fully closed no intermittent states...

yeha, I want to power a PVC plastic gate valve with the 12 v motor, but I need to know when to stop powering the motor, i.e. when the valve is fully open or fully closed.

The valve is for agricultural irrigation purpose.

I was looking at 2 inch actuated valves. In the Indian market they cost around 12,000 rupees(~$220). I have a couple of car window control motors. I was thinking of building a valve with it. I would appreciate your thoughts on some simple design.

okay, I got it here; http://answers.yahoo.com/question/index?qid=20081224212857AAiPmUA The rating is not with lux assumption but with KW of light/m^2; which is like http://answers.yahoo.com/question/index?qid=20081224212857AAiPmUA 668,449 lux = 1000 watts/square meter But looking at this it...

I see in most of the spec that the panel rating assumes temperature not more than 25 degree and light at 1000 lux. Producing a 1000 lux of light in a photographer's studio with LED lighting is a child's play. Refer; http://answers.yahoo.com/question/index?qid=20061216164802AA3VNeZ This...

Sorry, if you feel I am still persisting with this... I was doing some calculation on LED's at http://led.linear1.org/led.wiz for 10,000 LED's each 1 ohm resistor dissipates 0.225 mW the wizard thinks 1/4W resistors are fine for your application together, all resistors dissipate 281.25 mW...