Hello,
I have a query related to a project that I'm working on. I have to design a system that has to run a DC motor for 24/7 continuously with a weight of about 1kg on its shaft. I am using a high torque DC motor on 24V and a motor driver for the speed and power control, connected to an arduino.
I wanted to know that is there any other requirement like any closed loop feedback or anything else that would be required to maintain the constant motion of the motor or the motor driver would do the work here.
It's a little urgent, if you can help me with any suggestions I would be very grateful.
jremington:
Please state your requirements.
If this is a radial load, you need to buy a motor with bearings specified for greater than that load. Likewise if axial.
24/7 does not define your requirement. How many days/weeks/years is your design for?
Any motor with sleeve bearings will not fit. Some with ball bearings may. Some with sealed ball bearings would work better. An axial load will require a thrust bearing, which will be a ball bearing in addition to the normal shaft bearing.
Actually it is a rotating art piece for a museum attached to the top of ceiling, so it is an axial load in the gravitational direction. It has to rotate constantly at a speed of around 4rpm. There are 8 of them, connected to a 24V power supply with motor drivers and arduino.
Sorry, used the term 24/7 because the museum hours would be 10hrs/day everyday, didn't knew how to put it.
Actually I'm working on such a project for the first time, I have made many small robotics projects before but I don't know what would be the power or other requirements to keep such heavy and continuously moving motors stable for such long time. I have attached the link to the mechanism pic[upside down] that I've built. It consists of a DC motor, coupling, extended shaft and a bearing. On the other side of the board is the 1kg weight.
Yes but 10 hours a day for how long? If you expect it to run continuously for 100 years with no maintenance then you're out of luck. If it will be running for a few days or even a week or two then you're in with a chance.
4 rpm is almost certainly going to need a gearbox. Electric motors won't normally run smoothly at such low speeds.
MoeIrus:
Actually it is a rotating art piece for a museum attached to the top of ceiling, so it is an axial load in the gravitational direction. It has to rotate constantly at a speed of around 4rpm. There are 8 of them, connected to a 24V power supply with motor drivers and arduino.
Sorry, used the term 24/7 because the museum hours would be 10hrs/day everyday, didn't knew how to put it.
Actually I'm working on such a project for the first time, I have made many small robotics projects before but I don't know what would be the power or other requirements to keep such heavy and continuously moving motors stable for such long time. I have attached the link to the mechanism pic[upside down] that I've built. It consists of a DC motor, coupling, extended shaft and a bearing. On the other side of the board is the 1kg weight.
Paul_KD7HB:
Do I see a weld on the bearing housing?
No it's not a direct weld on the bearing. There is the holder that's welded having the bearing inside it.
Paul_KD7HB:
Thinking ahead, what is the worst that can happen if your design fails?
Well, they would pay me as soon as I show them in its working condition but I don't think that doing the job in an unreliable way would give me any benefit.
Is there any other addition you think would be necessary?
MoeIrus:
No it's not a direct weld on the bearing. There is the holder that's welded having the bearing inside it.
Well, they would pay me as soon as I show them in its working condition but I don't think that doing the job in an unreliable way would give me any benefit.
Is there any other addition you think would be necessary?
Properly done!
Of benefit would be knowing the mfg and number of the bearing so one could look at the specs to see it's possible life as a thrust bearing.