Magnetics - Revision history

Adamcolton: /* Power */

2020-06-30T19:54:44Z

Power

← Older revision		Revision as of 19:54, 30 June 2020
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	Looking at [https://www.mag-inc.com/Media/Magnetics/Datasheets/0P44416TC.pdf this one] the volume is about 80kmm^2.		Looking at [https://www.mag-inc.com/Media/Magnetics/Datasheets/0P44416TC.pdf this one] the volume is about 80kmm^2.

			[https://www.homemade-circuits.com/ferrite-core-material-selection-guide-smps/ This] is a great resource. I should look at push-pull circuit and try to understand the large equation in the middle describing the WaAc of a transformer.

	== Materials ==		== Materials ==

Adamcolton: /* Power */

2020-06-30T01:25:21Z

Power

← Older revision		Revision as of 01:25, 30 June 2020
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	=== Power ===		=== Power ===
	From [https://www.mag-inc.com/getattachment/Products/Ferrite-Cores/PowerDesign-FerriteCatalog2017.pdf this] document, they have a great table showing cores listed for power at various frequencies. They only go up to 250kHz. But it looks like P and R materials actually reach peak performance around 500kHz. The power curve seems to flatten off, so that increase might not actually buy much, but maybe another 10%. A 110v 15A wall outlet can only provide up to about 1500W. Looking for values in the chart, the cores that match that are not terribly expensive. Less than $10, possibly as little as $1. I need to do research, but it simplifies the problem of getting high power cores. Though at the cost of needing a high frequency switch.		From [https://www.mag-inc.com/getattachment/Products/Ferrite-Cores/PowerDesign-FerriteCatalog2017.pdf this] document, they have a great table showing cores listed for power at various frequencies. They only go up to 250kHz. But it looks like P and R materials actually reach peak performance around 500kHz. The power curve seems to flatten off, so that increase might not actually buy much, but maybe another 10%. A 110v 15A wall outlet can only provide up to about 1500W. Looking for values in the chart, the cores that match that are not terribly expensive. Less than $10, possibly as little as $1. I need to do research, but it simplifies the problem of getting high power cores. Though at the cost of needing a high frequency switch.

			Looking at [https://www.mag-inc.com/Media/Magnetics/Datasheets/0P44416TC.pdf this one] the volume is about 80kmm^2.

	== Materials ==		== Materials ==

Adamcolton at 21:02, 29 June 2020

2020-06-29T21:02:32Z

← Older revision		Revision as of 21:02, 29 June 2020
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	The correct frequency is critical. Ideally, the frequency should be as low as possible without saturating the transformer. Higher frequency increases hysteresis loss.		The correct frequency is critical. Ideally, the frequency should be as low as possible without saturating the transformer. Higher frequency increases hysteresis loss.

			=== Power ===
			From [https://www.mag-inc.com/getattachment/Products/Ferrite-Cores/PowerDesign-FerriteCatalog2017.pdf this] document, they have a great table showing cores listed for power at various frequencies. They only go up to 250kHz. But it looks like P and R materials actually reach peak performance around 500kHz. The power curve seems to flatten off, so that increase might not actually buy much, but maybe another 10%. A 110v 15A wall outlet can only provide up to about 1500W. Looking for values in the chart, the cores that match that are not terribly expensive. Less than $10, possibly as little as $1. I need to do research, but it simplifies the problem of getting high power cores. Though at the cost of needing a high frequency switch.

	== Materials ==		== Materials ==

Adamcolton: /* DIY Tests */

2019-09-09T16:01:47Z

DIY Tests

← Older revision		Revision as of 16:01, 9 September 2019
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	* Permeability		* Permeability
	* Hysterisis		* Hysterisis
			I may also need a way to measure and quantify saturation.

	== Notes from "Transformer and Inductor Design Handbook" ==		== Notes from "Transformer and Inductor Design Handbook" ==

Adamcolton: /* DIY Tests */

2019-09-09T15:54:37Z

DIY Tests

← Older revision		Revision as of 15:54, 9 September 2019
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	If I had access to a kiln I could try making soft ferrites by mixing Fe2O3 and ZnO and heating to 1500F.		If I had access to a kiln I could try making soft ferrites by mixing Fe2O3 and ZnO and heating to 1500F.

			I need a way to measure
			* Permeability
			* Hysterisis

	== Notes from "Transformer and Inductor Design Handbook" ==		== Notes from "Transformer and Inductor Design Handbook" ==

Adamcolton: /* DIY Tests */

2019-01-25T20:15:14Z

DIY Tests

← Older revision		Revision as of 20:15, 25 January 2019
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	* laminated steel plates		* laminated steel plates
	* plaster as binder		* plaster as binder
			* steel shavings: these are cheap and might provide a core closer to electrical steel

	If I had access to a kiln I could try making soft ferrites by mixing Fe2O3 and ZnO and heating to 1500F.		If I had access to a kiln I could try making soft ferrites by mixing Fe2O3 and ZnO and heating to 1500F.

Adamcolton: /* Notes from "Transformer and Inductor Design Handbook" */

2018-08-29T16:47:10Z

Notes from "Transformer and Inductor Design Handbook"

@@ Line 54: / Line 54: @@
    B =&mu;H
    &mu;: permeability of core
 [[Category:Electronics]]
 [[Category:Notes]]

Adamcolton: /* Notes from "Transformer and Inductor Design Handbook" */

2018-08-29T16:09:17Z

Notes from "Transformer and Inductor Design Handbook"

← Older revision		Revision as of 16:09, 29 August 2018
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	* Magnetizing: Gilberts/cm = Oersteds		* Magnetizing: Gilberts/cm = Oersteds
	* Flux Density: Gauss		* Flux Density: Gauss
			* Resistance to flux: Reluctance

	Magnetomotive Force		Magnetomotive Force

Adamcolton at 16:03, 29 August 2018

2018-08-29T16:03:57Z

← Older revision		Revision as of 16:03, 29 August 2018
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	Magnetomotive Force		Magnetomotive Force
	mmf = 0.4ΠNI		mmf = 0.4πNI
	N: number of turns		N: number of turns
	I: current		I: current

			Magnetizing Force
			H = mmf / MPL
			MPL: magnetic path length

			Flux Density
			B =μH
			μ: permeability of core
	[[Category:Electronics]]		[[Category:Electronics]]
	[[Category:Notes]]		[[Category:Notes]]

Adamcolton at 16:01, 29 August 2018

2018-08-29T16:01:36Z

← Older revision		Revision as of 16:01, 29 August 2018
Line 42:		Line 42:

	Magnetomotive Force		Magnetomotive Force
	mmf = 0.4πNI		mmf = 0.4ΠNI
	N: number of turns		N: number of turns
	I: current		I: current
	[[Category:Electronics]]		[[Category:Electronics]]
	[[Category:Notes]]		[[Category:Notes]]