The linear stepping motor is rotated by the magnetic rotor core through interaction with the pulsed electromagnetic field generated by the stator, and the rotary motion is converted into linear motion inside the motor by the screw and nut technology. The first introduction of linear stepper motors was in 1968. The following figure shows some typical linear stepper motors.

The result of this is that the design is
greatly simplified, enabling straight-line stepper motors for precise linear
motion without the need for external mechanical linkages in many applications.

When doing linear motion related products
or solutions, we recommend that engineers focus on the following points:

1. What is the load on the system?

The load of the system includes static
load and dynamic load, and the size of the load determines the basic size of
the motor.

Static load: The maximum thrust that the
screw can withstand when it is stationary.

Dynamic load: The maximum thrust that the
screw can withstand when it is in motion.

2. What is the linear running speed of the

The running speed of the linear motor is
closely related to the lead of the screw. When the screw rotates one turn, the
nut advances one lead. For low speeds, it is advisable to choose a screw with a
small lead. For high speed, a larger screw should be selected.

3. What is the accuracy requirement of the

Screw precision: Generally, the precision
of the screw is measured by linear precision, that is, the error between the
actual stroke and the theoretical stroke after the screw rotates the bitter

Repeated positioning accuracy: Repeated
positioning accuracy is an important indicator for the system to be able to
repeatedly reach the specified position.

Backlash: The relative axial movement of
both the screw and the nut of the backlash when they are at rest. As the
working time increases, the backlash increases due to wear. The compensation or
correction of the backlash can be achieved by a clearance nut. Backlash is a
concern when bidirectional positioning is required.

4, other options

Does the installation of linear stepper
motors conform to the mechanical design? How will you connect moving objects to
nuts? What is the effective stroke of the screw? What kind of driver is

MOONS’ has designed and developed the LE
series of linear stepper motors with its expertise and experience in design,
development, manufacturing and marketing of hybrid stepper motors, combined with
high quality spindles and nuts. The LE series linear motors are of external
drive type, and the lead screw is integrated with the motor rotor as the motor
output shaft. The nut is external to the motor and is coupled to the drive
mechanism. When the motor rotates, the nut moves linearly along the screw. The
nut can be a standard nut or a clearance nut. The lead screw length is usually
customized to the application requirements.

The external drive type linear stepper
motor model is shown in the table below.


Frame size

Max Rated Thrust


Screw Length


























External nut linear stepper motors
numbering system:


LE=External nut linear
stepper motors

Motor Type

17=42*42mm,Optional NEMA 8, 11, 14, 17, 23; 4S =
body length code, please refer to the base size confirmation

Lead Screw Type

T0808=screw length 8mm,lead=8mm,Please refer to the catalog for specific parameters.

Screw Length

100=100mm,Defined according to customer
requirements, minimum 1mm increment

Nut Type

AR1=Round standard
for T0808;AR = Round standard nut,BR = Round
anti-backlash nut,AT =Triangular standard nut,BT= Triangular anti-backlash nut,CN=Custom
made nut.

Customized Code

S=Lead screw end machining;0=No special custom,B=Brake,E=Encorder,C=Custom

Rated Current


MOONS’ also introduced the LN series of through-axis
and LC series push-rod linear stepper motors.

LN/LNSM series Non-captive linear stepper

A lead-screw nut is integrated into the
motor rotor, and the lead screw passes through the center of the motor. As the
motor rotates it moves linearly along the lead screw. The lead-screw can be
completely unscrewed from the motor, and can be any length. The motor can be
fixed so that the screw moves in out of the motor, or the lead screw can be
fixed so that the motor moves along the lead screw. In addition, the unique
LNSM series can be compatible with clearance nut and more screw options.

LC series Captive linear stepping motor

lead-screw nut is integrated into the motor rotor, and a lead screw passes
through the center of the motor. The lead screw drives an integral plunger in
and out. The plunger is supported by a housing that is part of the motor. This
is a complete assembly with a shaft that moves in and out. No separate supports
are needed for the screw or nut.