Ball Screw Motor Sizing

Moment of inertia is the measure of an object s resistance to changes in its rotation rate.

Ball screw motor sizing. Moment of inertia torque and speed. There are two different speed factors to consider when it comes to sizing ball screws. When an object is just sitting without any motion the moment of inertia is 0. Ball screw selection 1 selecting overall length of the screw shaft.

Intermittent motor torque is allowed only for a short time specified by the manufacturer and. Horizontal ball screw vertical ball screw rack and pinion roll feed rotating table cart elevator. Speed considerations for ballscrews. Johnson product engineer thomson industries inc.

The motor sizing principles we outline are applicable to x y tables and multiaxis pick and place machines. The sizing results for the capacity of the servo amplifier and motor and regenerative options that fit your application most. How to pick motors for linear motion. Ac servo capacity selection mrzjw3 motsz111e.

Selecting and sizing ball screw drives jeff g. Each method has its advantages and disadvantages but all serve to minimize or eliminate backlash between the nut and screw. There are three factors to calculate when sizing a motor. As well as being able to apply or withstand high thrust loads they can do so with minimum internal friction.

When sizing a motor one of the most important factors is the required torque. They are made to close tolerances and are therefore suitable for use in. Characteristic speed and critical speed. The closest pitch in an 8 mm screw diameter.

Additionally based on the list axial clearances of ball screws on p 1893 3 it can be confirmed that the bss1520 with axial clearance of 0 005 or less can satisfy the repeatability requirement of 0 01mm. Ball screw drive is a popular linear actuator introduction the ball screw drive is an assembly that converts rotary motion to linear motion and vice versa. A ball screw is a mechanical linear actuator that translates rotational motion to linear motion with little friction. How to calculate motor drive torque for ball screws.

A threaded shaft provides a helical raceway for ball bearings which act as a precision screw. While many factors are involved in the selection of a specific lead screw assembly lead screw sizing choosing the right diameter and lead for the. Ball screw length l max.