Hi, I am designing a folding curtain of about 76M in width & 20M in height.
The main shaft will be 76M long having pulleys at 3M distance, polyester straps will be connected to the pulleys & to the bottom load bar,
on rotation the pulleys will wind the strap thus lifting the bottom bar & the curtain,
Problem:
If I use one motor in centre then the 38M long free shaft has to transfer the torque!
The hollow shaft dia increases enormously, so along with the shaft the bearing block & all arrangement cost & size increases.
due to transfer of torque to such length the resulting deflection in twist is about 20mm, that will mean that the pulley closer to drive will take more load then the farther most pulley, also the twist is about 20MM.
Solution:
To use three gear motors connected parallelly in principle this will work as they have the same out put rpm (12rpm),
My dark area:
If one of the motor does not work then the other two motors will be additionally loaded and fail,
I am looking out for an electronic solution where all three motors are monitored for equal voltage, shuts down the system in case of any problem, indiacte problem motor, This circuit has to be economical & dependable.
Pl. GUIDE
The main shaft will be 76M long having pulleys at 3M distance, polyester straps will be connected to the pulleys & to the bottom load bar,
on rotation the pulleys will wind the strap thus lifting the bottom bar & the curtain,
Problem:
If I use one motor in centre then the 38M long free shaft has to transfer the torque!
The hollow shaft dia increases enormously, so along with the shaft the bearing block & all arrangement cost & size increases.
due to transfer of torque to such length the resulting deflection in twist is about 20mm, that will mean that the pulley closer to drive will take more load then the farther most pulley, also the twist is about 20MM.
Solution:
To use three gear motors connected parallelly in principle this will work as they have the same out put rpm (12rpm),
My dark area:
If one of the motor does not work then the other two motors will be additionally loaded and fail,
I am looking out for an electronic solution where all three motors are monitored for equal voltage, shuts down the system in case of any problem, indiacte problem motor, This circuit has to be economical & dependable.
Pl. GUIDE