QUESTION:
Do you have an example demonstrating a modeling procedure that can be used to model a current fed voice coil motor, such as those used in computer hard disk drives? This must be a 3D model and I would like to be able to calculate the structural response and coil displacement as a function of time given current excitation in the stranded coil.
ANSWER:
A 3D COUPLED FIELD model of a hypothetical voice
coil motor is attached to this solution. Inspect the
presentation. Place the animations in the same directory that you copy
the presentation to so that they will play in the presentation.
A well documented parameterized input file and post processing macro are
included. The input file creates the model and calculates the transient
magnetostructural response. The post processing macro produces xy plots
of (1) the net MVDI force acting on the magnetic circuit and (2) the net
Lorentz force acting on the coil.
Results quantities calculated:
1) Fields due to permanent magnets in magnetic circuit of current
in coil
2) Forces acting on magnetic circuit (MVDI) and coil (Lorentz)
3) Coil displacement versus time
Assumptions:
1) No eddy currents are induced in magnetic circuit - it is
modeled with SOLID96 MSP elements
2) Coil is current fed (current, rather than voltage controlled).
SOLID62 coupled field elements are used for this.
3) In my example the coil undergoes rigid body motion (due to
nodal coupling on displacement degree of freedom) and so is stress free.
However, by eliminating the nodal coupling, the deformation as well as
the translation of the coil could be calculated.
Note that I tried a number of other modeling strategies, including the
multifield solver. However, to date, this is the only approach I have
been able to successfully implement for this type of simulation.
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QUESTION: Do you have an example demonstrating a modeling procedure that can be used to model a current fed voice coil motor, such as those used in computer hard disk drives? This must be a 3D model and I would like to be able to calculate the structural response and coil displacement as a function of time given current excitation in the stranded coil. ANSWER: A 3D COUPLED FIELD model of a hypothetical voice coil motor is attached to this solution. Inspect the presentation. Place the animations in the same directory that you copy the presentation to so that they will play in the presentation. A well documented parameterized input file and post processing macro are included. The input file creates the model and calculates the transient magnetostructural response. The post processing macro produces xy plots of (1) the net MVDI force acting on the magnetic circuit and (2) the net Lorentz force acting on the coil. Results quantities calculated: 1) Fields due to permanent magnets in magnetic circuit of current in coil 2) Forces acting on magnetic circuit (MVDI) and coil (Lorentz) 3) Coil displacement versus time Assumptions: 1) No eddy currents are induced in magnetic circuit - it is modeled with SOLID96 MSP elements 2) Coil is current fed (current, rather than voltage controlled). SOLID62 coupled field elements are used for this. 3) In my example the coil undergoes rigid body motion (due to nodal coupling on displacement degree of freedom) and so is stress free. However, by eliminating the nodal coupling, the deformation as well as the translation of the coil could be calculated. Note that I tried a number of other modeling strategies, including the multifield solver. However, to date, this is the only approach I have been able to successfully implement for this type of simulation. |
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