Magnetostatic Analysis of a Solenoid in SolidWorks 

1.  What is a Solenoid?

A solenoid is a coil wound into a tightly packed helix. In physics, the term solenoid refers to a long, thin loop of wire, often wrapped around a metallic core, which produces a magnetic field when an electric current is passed through it. Solenoids are important because they can create controlled magnetic fields and can be used as electromagnets. The term solenoid refers specifically to a coil designed to produce a uniform magnetic field in a volume of space (where some experiment might be carried out). In engineering, the term solenoid may also refer to a variety of transducer devices that convert energy into linear motion. The term is also often used to refer to a solenoid valve, which is an integrated device containing an electromechanical solenoid which actuates either a pneumatic or hydraulic valve, or a solenoid switch, which is a specific type of relay that internally uses an electromechanical solenoid to operate an electrical switch; for example, an automobile starter solenoid, or a linear solenoid, which is an electromechanical solenoid.



2.  Magnetostatic analysis of a Solenoid

When a coil is excited, an electromagnetic force is induced causing the plunger to translate. This example treats this kind of phenomena. A motion study is setup using SW motion, then the Magnetostatic Study of EMS is coupled to it. The EMS solver and the motion solver will be communicating at each step to exchange information about the force and location of the plunger. EMS will calculate the force at the initial position then the force value is passed to the SolidWorks Motion, which in turn takes the force value, applies it to the plunger, calculates the new position and then sends it back to EMS. Then, EMS solver recalculates the force based on the new location and so on. Both solvers keep going back and forth until all steps are covered.


This is a Magnetostatic analysis of a solenoid. The study was coupled with motion to investigate the effect of the current induced electromagnetic force on the motion of the plunger. It was also coupled with thermal analysis to study the effect of Joule heating .




1.   Model View


Magnetic Flux Density Results





Magnetic Field Intensity Results

  1. Applied Current Density Results


  1. Force Density Results
    1. Temperature Results


  1. Temperature Gradient Results

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