Motion Coupling

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EMS can couple electromagnetic and motion analyses.  EMS handles such motion via a seamless integration in the most versatile and powerful mechanical motion package, SOLIDWORKS Motion, which accounts for all real-life components like springs, bushings, dampers, etc. 

A Motion analysis combines motion study elements withmatesin motion calculation. Consequently, motion constraints, material properties, mass, and component contact are included in the SOLIDWORKS Motion kinematic solver calculations.

As explained therein, in the motion manager, there are three types of motion study that can be defined:

  •  Animation
  • Basic Motion
  •  Motion Analysis

You may use any of the three types in SOLIDWORKS Motion.  However, you must use Motion Analysis if you want to couple the motion to EMS.


The Motion analysis is used to model the effect of mechanical motion on the electrical performance of electrical machines such as eddy current, inductance, flux linkage, and back emf. Similarly, it models the effect of electrical parameters such as current, voltage, and permanent magnet on the mechanical performance of electrical machines such as force, torque, speed, displacement, and acceleration.  It has many practical applications, including:
  • Motors
  • Generators
  • Clutches
  • Rotary and linear actuators
  • Solenoids
  • NDT sensors
  • Eddy current braking


After running a study coupled to motion analysis, you can view thefollowing:

  • The same electromagnetic results as a non-motion study at each motion time step or position.  Remember that the motion influences all field parameters such as magnetic flux density and eddy current density as well as the circuit quantities such as inductance, back emf, and flux linkage.
  • Kinematics results, i.e. position, speed, and acceleration.

Examples of design issues

The Motion analysis can help study many devices and address numerous phenomena.

Below is just a partial list:

  • Analyze complex electrical machines with powerful coupled electromagnetic motion simulation.
  • Design rotary and linear actuators using real life conditions.
  • Study the effect of motion on electrical parameters such as eddy current, magnetic flux density, inductance, and back emf.
  • Study the effect of electrical input such as current and voltage on the mechanical parameters such as force, torque, speed, and acceleration.
  • Simulate eddy current brakes and magnetic clutches.
  • Design and optimize NDT probes.