New lower price for Axon II ($78) and Axon Mote ($58).
0 Members and 1 Guest are viewing this topic.
I chose Aluminum as a material for the robot body, since it is light, easy to be formed and strong at the same time. But in my place, most of the time it is hot outside, so now am afraid that the robot my heat up and got damaged... any ideas how to overcome this problem?
i was thinking that maybe i can add a layer of material or paint that may help cooling down. I searched and I didn't find something similar, any ideas people???
Another thing, I am using a camera for the robot, and in order to get a vision which as stable as possible in the outdoor terrain, I decided to use sorbothane as a layer under my camera to absorb shocks. This material has some great characteristics. What do think of this? Do u have any other thoughts maybe??
Unless you live in #666, I seriously doubt that it should be too hot for aluminum How hot exactly does it get (in °C or °F)?If anything, it would be the electronics that might get too hot, but there's always a way.
Short of a layer of ice, if you add something it should be an isolating material, like something foamy (i.e. with trapped air) and some mirror finish on the outside to deflect sun rays (like a survival blanket).However, this would trap the heat generated by the 'bot and that would be a bad thing.I do think you exaggerate the heat problem though.
Whenever you add any kind of elastic mounting, you need some dampener as well, like a car where the movements of the springs is kept in check by the shock absorbers.How pronounced is the unsteadiness as it is?
If you are adding suspension, you need to do between the axles and body of the robot.
If you insulate your robot don't forget you are trapping all the heat from the motors and electronics in. You might have to add vents or a fan if you are using big motors. If you have any extra I/O you could add a temperature sensor to your controller and test your insulation ideas.
V_in = voltage to motorA_in = amperage to motorT_out = torque at motor shaftW_out = angular speed at motor shaftWattage_loss = V_in * A_in - T_out * W_out
Well, my outdoor temperature may reach to 55°C in summer time, it is a desert. so, with that temperature, and the vertical sun rays, i think it is possible for the aluminum to get heated right?.
Will the heat generated by the robot be that much?
I did some digging after reading this reply and I read about the aluminum foam and about its different application in aerospace, medicine etc. Is it a good solutions though?
and for the fact that it will trap the heat generated from the robot, will drilling some tiny holes in The 'bot body help in ventelating?
I don't know the amount of unsteadiness yet, my robot still didn't see the light, but since the outdoor terrain is full small stones and stuff, I thought about this problem and tried to solve it. I am sorry, but I didn't understand your last point. You said that if I have to use an elastic mounting, I need to add a dampener, and that goes with the sorbothane as well?? so i need to add another system to the robot or there is any thing simple for robots?
Which desert is that, if I may ask?
If your ambient temperature is 55°C, adding even a few Watt worth of heat may be a disaster for the electronics, if you encapsulate it.
A fine mist of water directed to a heat sink or wet felt strategically placed would help -
Make sure all semiconductors you use are spec'd for industrial, military or automotive temperature range.
yes I did, I have my chassis designed, I’ll be using an AVR microcontroller, particularly the baby orangutan Atmega 328P, 2 ultrasonic rangers for the obstacle avoidance problem, the motor drivers will be the ones in the MCU.. the TB6612FNG dual H-bridge, mounted on the baby orangutan, one blackfin camera and a matchport b/g, what do you think?
The Pololu micro metal gearmotors heat up relatively quickly at high voltages - how much power are you feeding to it? You can calculate approximate wattage lost to heat by doing the equationCode: [Select]V_in = voltage to motorA_in = amperage to motorT_out = torque at motor shaftW_out = angular speed at motor shaftWattage_loss = V_in * A_in - T_out * W_outThat value will have to be dissipated into the environment somehow, so make sure to account for it.
I live in the gulf region, In UAE in particular, and in summer time.. the temperature do reach up to 55oC
When I designed my robot body, I thought of preventing any sand or tiny particles to reach inside and damage or contaminate my circuit and components.. so i designed it to be similar to army tanks some how.. will that be considered as encapsulating electronics?
QuoteMake sure all semiconductors you use are spec'd for industrial, military or automotive temperature range.Will that be written in the specifications for the component itself?? coz i don't remember meeting this specification anywhere....