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Registered Member #1571
Joined: Wed Jul 02 2008, 03:26AM
Location: Bendigo Victoria Australia
Posts: 44
Hi there,
I have wound a secondary using a platter winding technique. That is, a number of square spiral coils next to each other. See the picture.
I am asking if anybody knows how to calculate the inductance of such a winding given it has a ferrite core and given that you know the number of turns, the dimensions of the core the voltage and the frequency. It can be done for a normal winding quite easily but how does the fact its wound in a platter configuration change the calculation if at all?
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
If the core is closed, only the number of turns is important. The inductance is proportional to the square of the number of turns. If you wrap a known number of turns around the core and measure the inductance, you know the constant that multiplies the square of the number of turns, and can determine the inductance of any coil. With an open core, this is also very close to the truth. The exact geometry of the coil is important only in a coil without core, or with air core. Voltage and frequency appear only if you consider nonlinear effects as core saturation, and the distributed capacitance of the coil.
Registered Member #1571
Joined: Wed Jul 02 2008, 03:26AM
Location: Bendigo Victoria Australia
Posts: 44
Thanks Antonio,
I have this winding sitting just over a cm away from the core itself - for clearance. How does the fact a winding is not sitting next to the core and is wound "wider" than the area of the core affect the inductance if at all?
Registered Member #1819
Joined: Thu Nov 20 2008, 04:05PM
Location:
Posts: 137
Antonio wrote ...
If the core is closed, only the number of turns is important. The inductance is proportional to the square of the number of turns. If you wrap a known number of turns around the core and measure the inductance, you know the constant that multiplies the square of the number of turns, and can determine the inductance of any coil. With an open core, this is also very close to the truth. The exact geometry of the coil is important only in a coil without core, or with air core. Voltage and frequency appear only if you consider nonlinear effects as core saturation, and the distributed capacitance of the coil.
Any open (gapped) core can be considered as a single homogeneous (Did I spell that right?) material with an effective permeability of u. This is what you are trying to find.
DO NOT ignore voltage or frequency, as they can cause severe problems if not optimized to your core. I can help with this, if you provide the dimensions of your core.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Is the 89 SHS your core? Or is this removed and replaced with ferrite? Rough inductance will be L=(4.06 x N^2 x u x A)/(27 x l) All units in inches. A=cross sectional area, l=length of coil. u=permeability of core N=no. turns. Can you share the purpose of the coil? High voltage will introduce problems with the sharp corners.
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Inductance calculation for a platter wound transformer...
