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VEBill (Military) 8 Mar 13 11:23ĭoesn't pass thru the copper - around it.I have a hard time getting my head around the minute details of this.
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I'm wondering if there is anyone that has a better understanding in this area that could shed light on what I should do to improve the coil design. Second is the air gaps between the coil windings in the PCB are greater than those of the hand wound coil. There are 2 other issues that I'm thinking of, but I can find very little about either on. The resistor created loss of power transfer, but not nearly enough to cause failure.
#PCB COIL DESIGN PROGRAM SERIES#
I tested the hand wound coil with a 30 ohm resistor in series with the coil, but still, ample performance was found. First off, the DC resistance of the hand wound coil is about 3 ohms, where as the DC resistance of the PCB coil is about 35 ohms. I need to make changes to the PCB to improve this but changes are very expensive, so I need to understand what's going wrong. It also doesn't seem to resonate nearly as well. Problem is, this PCB coil does not pick up power nearly as efficiently as the hand wound coil does. In the same way, capacitance is added to the device under power to bring the system to resonance. The coil windings on the PCB are all in series, so it is also 24 turns. The board house tells me that the inter layer spacing is. 01" spacing between coils on the same layer. I have since designed a PCB with 4 layers of 6 turns each, one ounce copper, with traces. This aids in the power coupling across the gap. The device that is being powered by this coil has capacitors across the input such that the coil and capacitors form a resonant circuit. The device that is rotating has a large, 7" diameter, coil wound in air with 24 turns of 26 gage wire. The device that is stationary outputs an alternating magnetic field at 26kHz (sine wave) using a U shaped ferrite. I have an application in which I am transferring power from a stationary device to a device that is rotating.