Linear Servo Motor

Linear Servo Motor

The Nippon Pulse’s Linear Shaft Motor is a brushless, high-precision direct drive linear servo motor with a tubular design. The motor consists of a magnetic shaft and coil assembly (forcer), and is driven and controlled by the flow of current. The Linear Shaft Motor can replace ball-screws, pneumatics, U-shaped motors and other linear motion systems.

Design Concepts of the Linear Servo Motor

  • - Simple: Two parts and a non-critical air gap

    - Non-Contact: No wearing and maintenance free
    - high precision
  • : Ironless design and all the magnetic flux is used

Basic Structure of a Linear Shaft Motor

The magnetic structure of the Shaft is built in such a manner that there is no space between each magnet; it is fully supported within itself. The magnetic structure is then inserted into a protective stainless-steel tube. This process is protected by numerous patents. This patented process produces a very strong magnetic field twice that of other linear motors.

Forcer Construction

The coils of the Linear Shaft Motor are of a cylindrical design, providing a number of key advantages over other linear motors.

  • The cylindrical design of the coil assembly is very stiff without external stiffening materials (i.e. iron used by platen-style linear motors).
  • The coils surrounding the magnets allow for the optimal use of all the magnetic flux. This makes the air gap non-critical.
  • As long as the forcer does not come in contact with the shaft, there is no variation in the linear force.
  • The magnetic flux cuts motor windings at right angles for maximum efficiency.
  • All sides of the coil are positioned to allow for maximum dissipation of heat.
  • The more efficient Linear Shaft Motor requires less power in a compact design while producing a comparable force to that of a similarly sized traditional linear motor.

Linear Shaft Motor Specification Overview

- Variety of shaft diameters, ranging from 4mm to 100mm
- Stroke lengths of 20mm to 4.6M
- Achievable peak force of 2340N
- Maximum continuous force of 585N


Linear servo Motor

 design concept

Advantages of linear servo motors

Linear Shaft Motor Sizing   
One of the most straightforward tasks in the design of a linear motion system is to specify a motor and drive combination that can provide the force, speed and acceleration that is required by the mechanical design.
This is all too often the most overlooked aspect of the linear motion system design. Often, the engineer will select a motor, and then design a system around it. This approach leads to improperly sized motors for the application, making this the most costly aspect of the system, not only from the perspective of the initial purchase cost, but also due to service maintenance and energy costs.

Applications of the linear servo motors


Frequently asked questions


If you have a question that needs an answer, this is the place.

Part number



Download the linear Shaft application worksheet
(Excel file)

we also have a "simple" version (IPAD)

3-D CAD models

 download the related CAD-files


More information:

Contact us for more detailed information:

+31 499 371007 (NL) 

+49 2157 128990 (DE)