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KeepIS

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Joined: 13/10/2014
Location: Australia
Posts: 1848

Posted: 04:44am 21 May 2025

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In case anyone is interested.

I finally had some MS226060-2 arrive from an AliExpress site that has the slowest delivery time I've seen, Site keeps saying my order is canceled due to shipping delays, then they issues a new consignment tracking number, no tracking info and then after a month or so, it suddenly appears at my doorstep via DHL.

Toroids 57.1x26.4x15.2mm

It's the last on on the list, click "View More" to expand the list (57.1x26.4x15.2mm)

These are the original meatier (smaller hole) Blue Toroids that I use, they will just fit 5 turns through a six Stack of Toroids for around 23uH, 4 turns will give 16uH.

You need 12 of these Toroid Rings to make two x 6 stack chokes at either 16uH or 23uH, the price shown is for a 3 pack.

And just to make me want to bash my head against the sharp edge of a desk

Replacing a temporary 40uH Toroid choke in one side of the "Test Inverter" with one of these 23uH chokes, which matches the existing 23uH choke in the other side, has completely eliminated the Buzz I could induce into the Toroid by fast stepping the DC input up or down. It still makes a slight Buzz as you fast step the Voltage up, but as soon AC regulation is reached, the buzz stops and the Toroid remains silent (ear against the Toroid)

Made a slight miscalculation in the Inductance, 4 turns 16uH, 5 turns 23uH.

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Edited 2025-05-22 11:43 by KeepIS

NANO Inverter: Full download - Only Hex Ver 8.1Ks

KeepIS

Guru

Joined: 13/10/2014
Location: Australia
Posts: 1848

Posted: 04:49am 22 May 2025

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There is a difference in the Toroids, these New units are marked as FM571060A, the old Toroids are MS226060-2. I cannot find any reference to FM571060A.

They both give exactly the same Inductance for the Number of turns and are the same size.

The newer units look to have a much softer curve. I have repeated the tests many times and every run is identical.

Yellow: Current 125A per volt.

Blue: Cap discharge voltage from 75V.

Original MS226060-2 Toroids:

The New Toroids:

If you compress the time scale, the second image is virtually the same as the first, it's almost as though there is a small resistance in play? I rechecked the cable, both use the same cable, everything looks identical and the display for each as shown above is always exactly the same no matter how many times I swap them into the JIG.

EDIT:

At 625A, the Cap voltage (blue) has dropped from 75V to 58V, there is still plenty of reactance left.

If the Choke is replaced with the same winding lenght cable, the Cap voltage trace is simply a narrow pulse from 50V to 0V ("almost" zero inductance).

A single power board bank of FETS handling 625A would not see anything like a short, especially as there are effectively two chokes in series with the Toroid.

So "32 FETS" and FOUR chokes in a Dual Inverter can easily handle 800A peak Induction motor start loads.

BTW: I proved that if built correctly, a single wiseguy Power board with two chokes and one Toriod, can easily handle repetitive 650A Peak start loads daily for months.
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Edited 2025-05-23 12:03 by KeepIS

NANO Inverter: Full download - Only Hex Ver 8.1Ks

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