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Description
The coil surface type is defined as a circular cross section swept along a helical curve where the helical axis of symmetry is along Z. There are four parameters which completely specify the coil surface; the helix radius (R), the circle radius (r), the coil pitch and the number of coil turns. The following figure illustrates the parameters used in the coil surface definition for R = 0.5, r = 0.124, pitch = 0.25 and turns = 4.
Mathematically, the surface definition is parameterized according to the following equations:
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Parameterization
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Surface
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Helical Curve
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Local Coordinate Vectors
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Auxiliary Relations
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Navigation
This feature can be accessed by selecting Coil Surface (spiral surface) as the surface type on the Surface tab of a surface dialog box.
Controls
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Control
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Inputs / Description
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Defaults
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Logical Parent
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Name of Parent entity.
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Name
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Name of surface supplied by user.
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Surf n
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Description
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Description of the surface.
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Traceable
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Surface can be raytraced.
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Checked
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Use for trimming only
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Never raytrace. Surface used for trimming only.
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Unchecked
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Surface Type
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Surface type to create.
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Surface Settings
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Helix Radius
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Major radius of the coil (R in the diagram above)
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0.5
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Circle Radius
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Minor (filament) radius (r in the diagram above)
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0.05
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Pitch
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Distance between neighbor coil turns
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0.25
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Turns
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Number of coil turns (can be non-integer)
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4
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OK
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Accept settings and close dialog box.
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Cancel
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Discard settings and close dialog box.
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Apply
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Accept settings and keep dialog box open.
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Help
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Access this Help page.
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Application Notes
Surface Trimming
The coil surface is an explicit parametric surface and therefore cannot be used to trim other surfaces. However, the coil surface can be trimmed by FRED's other implicit surface types.
Surface Deformation
The Coil Surface is a "non-sagable" surface and therefore cannot be used as a deforming surface. A "sagable" surface is defined as single-valued in z.
Related Topics
Surface types summary
Create a new surface
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Copyright © Photon Engineering, LLC
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