Litz wire size for coils

[6666]

Are your coils just the wire with no other components in them? Are they specified with or without their feedlines attached? Do you have a coil you made using the coil calculator for a specific value that is not shielded or enclosed to get an idea how close it comes to the calc value?

Just my thoughts

Dan

Dan and Green I arrived at my conclusion that my LC200A reads high, after testing numerous coils and comparing the data and comments published from various sources.

[geoscash1]

Question,

I have used both the 250/46 and 175/46 litz (purchased from ebay).

I noticed there are 2 types of litz wire, double layer and single layer.

The single uses single layer nylon for the outside insulation and polyester insulating film for each copper strand. Outer diameter is 0.90 mm.

The double uses double layer nylon for the outside insulation and polyester insulating film for each copper strand and outer diameter is 0.94 mm. Insulation voltage is 500v.


which type is better or does that matter??? since the Q factor seems to be in the same range, 800 to 1500 I am guessing the double layer is going to be a bit slower because of capacitance???

[baum7154]

I would think the double layer would have less capacitance because of greater inter-wire spacing.

Dan

[godigit1]

Hi,
I found this looking for litz wire that is teflon coated, I didnt know they had a triple coated one as well.



Rubadue Wire offers an industry-leading range of high-quality, high temperature electronic wire. In addition to the wires you will find on our website, we manufacture custom insulated products to meet your requirements, always striving to exceed customer expectations. Use this product search and website to make your project a success, from research/development to production, with responsive service and excellent technical support. All of our products are subjected so 100% quality testing helping ensure you receive the highest quality insulated wire on the market. Our primary insulation materials include ETFE, FEP, PFA, Tefzel, and TCA. We also insulate Litz.


Triple Insulated Wire

Rubadue Wire was the first company to design and manufacture triple insulated wires. Triple insulated wires can be used to meet several design requirements and here are a few, but not all:

• Wind directly on top of magnet wire
• Use as primary and secondary winding
• High Voltage
• Reduce space, volume, weight

Double Insulated Wire

Rubadue Wire manufactures several double insulated wires to be used in supplementary isolation applications. Here are some of the design requirements that double insulated wire from Rubadue Wire can meet:

• High Voltage
• Meet creepage and clearance requirements
• Increased safety
• High speed winding capable

Single Insulated Wire

Rubadue Wire manufactures several single insulated wires to be used in basic isolation applications. Below are some of the design requirements met by Rubadue Wire's single insulated wire:

• Hook-up or lead wires
• High Voltage
• Leakage or loss reduction
• High speed winding capable

Litz Wires

Rubadue Wire insulates a wide range of litz wires. If you have not heard of litz wire, don't worry here is what litz wire can do for your wire solutions. Litz wire is made of several strands of enamelled magnet wire that are bunched or stranded together. It is used where losses caused by the skin-and proximity effect on a single wire are too high due to the operating frequency. At the same time the operating temperature is reduced by its use. Litz wire has much greater mechanical flexibility than a single wire with the same cross-section.
Some Applications:

• Solar
• Inductive heating elements
• Power supply units
• Renewable energy
• Automotive

This one with the self bonding layer looks interesting. Got me thinking Only thing I cant find how many strand they are.

REINFORCED (3 LAYERS), DUPONT™ TEFZEL® ETFE INSULATION, .001" / LAYER WITH .0015" SELF-BONDING OVERCOAT


DOWNLOAD SPEC

REQUEST QUOTE

Product Information

Temperature Rating:
155°C


Wire Category:
CoilBond™


Insulation:
DuPont™ Tefzel® ETFE with Self-Bonding Overcoat


Size Range:
20 AWG - 40 AWG


Compliances:
RoHS Compliant
UL 60950-1 (Ed.2), Annex U
UL OBJT2 File No. E206198


Voltage Rating:
1000 V


Breakdown:
Approx. 4500 V


OD Tolerances:
20-24 AWG: +0.0015" / -0.0005"
25-40 AWG: +0.001" / -0.0005"



Insulation Information

Insulation Type:
Fluoropolymer


Thermal:
Continuous Operating Temperature, 150°C


UL Flammability Rating:
V-0


Dielectric Constant:
2.6


Tensile Strength (psi):
6500


Elongation(%):
150-300


Abrasion Resistance:
Excellent


Bondability:
Excellent


UV Resistance:
Excellent


Chemical Resistance:
Excellent


Water Resistance:
Excellent


Long Term Stability:
Excellent




BARE CORE WIRE SPECIFICATIONS:

20	0.0317	0.0320	0.0330	0.0975	0.1053	0.1108
21	0.0282	0.0285	0.0294	0.1229	0.1328	0.1400
22	0.0250	0.0253	0.0261	0.1559	0.1685	0.1781
23	0.0224	0.0226	0.0233	0.1956	0.2112	0.2219
24	0.0199	0.0201	0.0207	0.2478	0.2669	0.2811
25	0.0177	0.0179	0.0184	0.3137	0.3366	0.3554
26	0.0157	0.0159	0.0164	0.3948	0.4266	0.4517
27	0.0141	0.0142	0.0146	0.4982	0.5349	0.5600
28	0.0125	0.0126	0.0130	0.6283	0.6793	0.7125
29	0.0112	0.0113	0.0116	0.7892	0.8446	0.8875
30	0.0099	0.0100	0.0103	1.0009	1.0785	1.1359
31	0.0088	0.0089	0.0092	1.2546	1.3616	1.4376
32	0.0079	0.0080	0.0083	1.5414	1.6852	1.7838
33	0.0070	0.0071	0.0074	1.9392	2.1395	2.2720
34	0.0062	0.0063	0.0066	2.4378	2.7173	2.8962
35	0.0055	0.0056	0.0059	3.0506	3.4391	3.6803
36	0.0049	0.0050	0.0053	3.7803	4.3140	4.6368
37	0.0044	0.0045	0.0048	4.6089	5.3259	5.7505
38	0.0039	0.0040	0.0043	5.7431	6.7406	7.3195
39	0.0034	0.0035	0.0038	7.3539	8.8041	9.6306
40	0.0030	0.0031	0.0034	9.1860	11.2227	12.3700

*ASTM B33 sets no standard for minimum resistance. This is only an indicator to investigate other aspects such as tin-thickness and tin coverage.


Conductor:
Tin Plated Copper, Solid or Stranded (ASTM B-33/ASTM B-286)
Bare Copper and other conductors available


ETFE is a Fluoropolymer compound with excellent electrical properties, heat resistance, chemical resistance, and abrasion resistance. Commonly used in winding wires, UL AWM wires, and medical applications Self-Bonding Overcoat Information: The Self-Bonding Overcoat is a proprietary material intended for bonding the product together and it should not be considered an additional layer of insulation nor should it be used for any additional electrical or mechanical properties


INSULATED WIRE INFORMATION:

T20A01TXXX-1-SB-1.5	20	0.032	0.813	0.041
T21A01TXXX-1-SB-1.5	21	0.029	0.724	0.038
T22A01TXXX-1-SB-1.5	22	0.025	0.643	0.034
T23A01TXXX-1-SB-1.5	23	0.023	0.574	0.032

Address1301 N. 17th Avenue, Greeley, CO, 80631

[Elliot]

Charted all of the coils I have made for the test. The target TC was 5.4usec instead of 5usec today, don't know why. Next test, chart signal amplitude vs target distance for the coils as is. Then shield some of them and with a longer lead line chart signal amplitude vs target distance. Targets, 1x1 inch aluminum can and something smaller. Maybe the smaller target will show a need for Litz wire. Maybe there is another test procedure that would show a need for litz wire. So far I'm not seeing it. Suggestions appreciated. Current profile, constant rate, 160usec on time, 1 amp peak.

This is fantastic stuff, but what happened to the results of coils C and G? Also, where are you measuring the decay time from and to, or is it the rise time you are measuring and trying to minimise?

[green]

This is fantastic stuff, but what happened to the results of coils C and G? Also, where are you measuring the decay time from and to, or is it the rise time you are measuring and trying to minimise?

Didn't make coils C and G. https://www.geotech1.com/forums/atta...2&d=1456254657 Recorded amplifier out with scope, no target and target recording. Subtracted no target from target recording in Excel and charted linear-log.
Coil off command triggers scope, zero time on chart. Test was to determine what effect wire type and solid wire size had on required delay time before target sample. Target controls decay time. Test would have been better if all coils had the same inductance. Tests were done with about 1A peak Tx. Higher peak current might need larger wire. Litz wire would allow about 1us less delay than AWG28 solid. Delay for AWG24 solid maybe 2us more than AWG28 solid. Results from my amplifier and coils wound as shown.