Linear Motor

JMAG can be used to model linear electric machines. When modeling a linear machine, it is critically important to have an accurate model of the forces on the tooth tips. This requires very accurate mesh that can account for model symmetry. If the mesh is not symmetrical, it may produce numerical errors in the force calculation. Accurate mesh is also necessary when testing precise movements of the components.

Evaluation Items

Cogging force, thrust force, attractive force, response, eddy current, residual magnetization, current control, induced voltage, efficiency, loss, heat generation, vibration and noise

Case Studies

Electromagnetic-Force Analysis

A harmonic analysis of the torque waveforms will help identify the optimal magnet skew. An appropriate skew angle will reduce cogging torque by 50% or more while maintaining the same thrust force. Reducing cogging torque will drastically reduce the amount of noise that the machine generates.




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    • Application Catalog

    112 – Starting Thrust Force Anal…

    OverviewLinear motors are widely used for carrier devices and machine tools because of their high-speed performance, …

    8 Mar 2018

    • JMAG-RT Model Library

    [RTML-045] LSM_01

    Features and principal useGeometry display on JMAG-DesignerTypeModelLSM_01Model nameLSMMax. Power2(kW)Direct current …

    6 Mar 2018

    • JMAG Users Conference Proceedings

    Development of a rail brake for railwa…

    Yasuaki Sakamoto, Maglev Systems Technology Division, Railway Technical Research Institute

    13 Mar 2015

    • Application Catalog

    134 – Speed Control Analysis of …

    OverviewLinear motors are widely used for carrier devices and machine tools because of their high-speed performance, …

    26 Nov 2009

    • Application Catalog

    104 – Thrust Force Analysis of a…

    OverviewLinear motors are widely used for carrier devices and machine tools because of their high-speed performance, …

    9 Mar 2009

    • Application Catalog

    54 – Analysis of the Cogging For…

    OverviewLinear motors have been widely used in carrier devices and the drive units of machine tools due to their capa…

    24 Oct 2008

    • Application Catalog

    64 – Thrust Force Analysis of a …

    OverviewLinear motors are widely used for carrier devices and machine tools because of their high-speed performance, …

    • Application Catalog

    41 – Positioning Control Analysi…

    OverviewLinear motors are widely used for carrier devices and machine tools because of their high-speed performance, …

    16 Jan 2008

    • Application Catalog

    2 – Cogging Analysis of a PM Lin…

    OverviewLinear motors have been widely used in carrier devices and the drive units of machine tools due to their capa…

    30 Oct 2006

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