MotorLab

MotorLab sizing suite

Screw-driven motor sizing

Estimate torque and speed for ball and lead screw systems. Advanced mode includes external loads, inertia, and duty cycle.

Inputs

Screw type

Select Lead or Ball screw type for realistic efficiency assumptions.

Screw lead

mm/rev

Linear travel per revolution in mm/rev.

Load mass

Total moving load mass in kilograms.

Desired linear speed

mm/s

Target linear speed in mm/s.

Time to reach speed

Acceleration time from rest to target speed.

Orientation

H for horizontal motion or V for vertical lift.

Friction coefficient

Effective friction coefficient for guides and screw system.

Screw efficiency

Mechanical screw efficiency from 0 to 1.

Gear ratio (screw : motor)

Transmission ratio from screw torque to motor torque.

Drive efficiency

Gearbox and coupling efficiency from 0 to 1.

Results

Key resultsRequired motor performance

Required continuous torque

0.011Nm

Required peak torque

0.011Nm

Required speed

7,200RPM

Use these results to find motors

All results

Lead

0.01

m/rev

Linear speed

0.4

m/s

Linear acceleration

0.5

m/s^2

Normal force

147.15

Friction force

8.829

Axial force (no friction)

7.5

Total axial force

16.329

Screw torque

0.029

Screw speed

2,400

RPM

Motor torque

0.011

Motor speed

7,200

RPM

Screw motor sizing - Mode 1

Inputs

Item	Value	Unit
Screw type	Ball
Screw lead	10	mm/rev
Load mass	15	kg
Desired linear speed	400	mm/s
Time to reach speed	0.8	s
Orientation	H
Friction coefficient	0.06
Screw efficiency	0.9
Gear ratio (screw : motor)	3
Drive efficiency	0.9

Key results

Item	Value	Unit
Required continuous torque	0.011	Nm
Required peak torque	0.011	Nm
Required speed	7,200	RPM

Outputs

Item	Value	Unit
Lead	0.01	m/rev
Linear speed	0.4	m/s
Linear acceleration	0.5	m/s^2
Normal force	147.15	N
Friction force	8.829	N
Axial force (no friction)	7.5	N
Total axial force	16.329	N
Screw torque	0.029	Nm
Screw speed	2,400	RPM
Motor torque	0.011	Nm
Motor speed	7,200	RPM