Selection Between Gear Motor/Servo Motor

Your leadscrew is way too large in diameter, and the kw is way too high. The friction coefficient could also be made considerably less.

It's 3 metres long so they may be right on diameter to avoid any wobbling. With circulating ball the friction horizontally is small, nowhere near 0.5. Is your 50 kg held only by two leadscrews or is there some other support like a sliding rail or bed?

To know the position of the travelling load is you need a servomotor with an encoder which gives pulses as it turns which can be counted. You need someone conversant with CNC/robotics to advise on type and accuracy of the screw, motor driver, encoder number of pulses per revolution, resetting at each end and some kind of indicator calibrated to show in mm or inches etc. There's a few safety considerations, emergency stop, operator access, end stops.

Hi Kazenngg, I came across a motor that acts like a servo motor it operates at low speeds, speed is controlled by a standard VSD, the motor even when stalled does not draw excess current, it also has full torque over the full speed range it is a brilliant motor you can contact the suppliers direct http://www.ceg.co.nz/

Best Regards

Joe

Before all, I don`t know how you did your Calculus (manually or by software), is probably you`re right, but the last one is most simple. . (Mitsubishi). Compare your results.

After that I recommend you, always use Gearbox, plus servomotor and servo amplifier.

Because of Gearbox increase Torque, you will need much small a servomotor & servo amplifier and of course your cost come down. The Gearbox is important also because servomotor don´t shall be connected directly to the load, because of the lifetime of the bearing will be very short.

In Mitsubishi case, you can obtain a Servomotor & Gearbox in one unit package deciding and find it by software equipment Code and ratio 1:N, eliminating coupling problems between them. The equipment result cover all your needs for your task.

If you want to choose independent gearbox, some companies has table for coupling yours reducer with important manufacturers, including data likes Inertial moment, Torque with it.