Darron Mawhinney
Mechanical
- Nov 27, 2019
- 1
Hello All,
I need some advice on selecting a motor for my application.
I am not electrically minded in anyway and have no experience with motors.
My application is a large turn table (seem my rough sketch attached)
The top plate is approx 1000mm in diameter 5mm thick and will carry a weight of approx 200kgs.
This must rotate at approx 3rpm with a soft start and a soft stop controlled by a switch , ideally the rotation will be in either direction. The motion must be smooth as the items on the top plate must feel as little effect of the motion as possible.
The top plate is separated from the bottom plate by a thrust bearing (100mm diameter) and the periphery of the plate is supported by 4x ball transfer units.
I have constructed the plates and the motion is free enough for the desired application and I can easily rotate the top plate with a gentle push of my hand.
however I need to control the rotation especially at the start and stop as this is when the item on the top plate feels the most disturbance of the motion.
My plan is to attach a plastic ring gear to the underside of the top plate and offer a motor shaft through a hole in the bottom plate then attach a spur gear to engage with the ring gear and provide the motion.
I need to know how big the motor needs to be (bearing in mind the bearings have made the motion very free and way) and what I would need to make the motor start gently and reach approx 3rpm within a few seconds, and then stop softly also.
Any help would be grately appreciated, thank you.
Darron.
I need some advice on selecting a motor for my application.
I am not electrically minded in anyway and have no experience with motors.
My application is a large turn table (seem my rough sketch attached)
The top plate is approx 1000mm in diameter 5mm thick and will carry a weight of approx 200kgs.
This must rotate at approx 3rpm with a soft start and a soft stop controlled by a switch , ideally the rotation will be in either direction. The motion must be smooth as the items on the top plate must feel as little effect of the motion as possible.
The top plate is separated from the bottom plate by a thrust bearing (100mm diameter) and the periphery of the plate is supported by 4x ball transfer units.
I have constructed the plates and the motion is free enough for the desired application and I can easily rotate the top plate with a gentle push of my hand.
however I need to control the rotation especially at the start and stop as this is when the item on the top plate feels the most disturbance of the motion.
My plan is to attach a plastic ring gear to the underside of the top plate and offer a motor shaft through a hole in the bottom plate then attach a spur gear to engage with the ring gear and provide the motion.
I need to know how big the motor needs to be (bearing in mind the bearings have made the motion very free and way) and what I would need to make the motor start gently and reach approx 3rpm within a few seconds, and then stop softly also.
Any help would be grately appreciated, thank you.
Darron.
