- #1
beeohbee
- 8
- 0
Hi everybody,
I'm making a machine at home which will cut a predetermined length of ribbon from a reel. I've designed it all but I'm not sure what sort of spec motor to use.
I'll be using a microcontroller to take the users input and a sensor will sense the size of the wheel. The microcontroller can then calculate when to cut the ribbon so that it's the correct length.
Essentially, a motor will drive a reel of ribbon which will be held vertically on a horizontal shaft. The reel will weigh no more than 2kg and is about 0.3m in diameter. I'm happy for it to rotate at any speed between 1 and 5 rps so I've modeled it on 3 rps.
I've calculated the torque by modelling the wheel as 2kg in mass and assuming that that weight is located at a distance of 0.15m from the shaft. I used that to find the power needed, which is roughly 55W.
Could anybody advise me on the sort of motor which would be useful in this situation? I'm not sure if it would be best using a high torque DC motor at about 12V or if an AC motor would be better. I can use a relay to switch an AC circuit on but I don't know if that would be even more over the top. The types of motor are a little over my head at the moment so any help is appreciated.
I know it's a completely over-engineered project but I thought it would be a good exercise to educate myself on electrical systems and electronics.
Cheers,
Rich
I'm making a machine at home which will cut a predetermined length of ribbon from a reel. I've designed it all but I'm not sure what sort of spec motor to use.
I'll be using a microcontroller to take the users input and a sensor will sense the size of the wheel. The microcontroller can then calculate when to cut the ribbon so that it's the correct length.
Essentially, a motor will drive a reel of ribbon which will be held vertically on a horizontal shaft. The reel will weigh no more than 2kg and is about 0.3m in diameter. I'm happy for it to rotate at any speed between 1 and 5 rps so I've modeled it on 3 rps.
I've calculated the torque by modelling the wheel as 2kg in mass and assuming that that weight is located at a distance of 0.15m from the shaft. I used that to find the power needed, which is roughly 55W.
Could anybody advise me on the sort of motor which would be useful in this situation? I'm not sure if it would be best using a high torque DC motor at about 12V or if an AC motor would be better. I can use a relay to switch an AC circuit on but I don't know if that would be even more over the top. The types of motor are a little over my head at the moment so any help is appreciated.
I know it's a completely over-engineered project but I thought it would be a good exercise to educate myself on electrical systems and electronics.
Cheers,
Rich