Magtrol Hysteresis Dynamometer HD-400-2 RPM and Torque Tested working euc

[Nicholas Stock]

Pricey, but those spinners look clean...:)

Look at this on eBay

Magtrol Hysteresis Dynamometer HD-400-2 RPM and Torque Tested working euc

Not my auction etc etc..

Nick

Sent from my iPhone

[Bill Notfaded]

Hmmmm I wonder how it works with that wheel? It's supposed to show the RPM of that wheel spinning? I like this stuff and dekatrons.

[Bill Notfaded]

Maybe it's not the wheel but the post on the axis and the wheel has some adjustment on it?

[GastonP]

It is a dynamometer, and as such, it measures force. In this case, torque. It is based in the electromagnetic brake principle and dynamic balance and all of this is done to measure the force of a motor or other rotating device in a dynamical way.

Probably there is an electromagnet either in the box behind the dial or within the thick axis. The axis rotates at a speed imposed by the DUT (Device Under Test), which we cannot know what it was but we can assume it was some kind of motor/engine.

The electromagnet generates a field that is induced in the axis/disc, which in turn generates a counterfield that attracts the axis to the electromagnet. This results in a braking effect. Changing the current through the electromagnet changes in turn the amount of force. The disc must have some kind of spring behind which is calibrated in force units. When the disc is in the "0" position, the force imposed by the rotating axis equals the one in the disc, thus balancing the system. One reads the force as a proportion to the magnetic field / current through the electromagnet.

I hope I could explain it well, but the principle is really simple. The idea of using a magnetic brake is that there are few losses in the system (no friction as in a mechanical brake) and the calibration is easier and last a lot longer.

[Bill Notfaded]

That's helps a lot X you explained it well.  I was trying to imagine how the disc enabled adjusting the test somehow because it's obviously graduated.  I wish it had a test mode... I don't see anything like that on it... I was thinking to simulate turning the magnetic field so you could get the dekatrons going without having to spin the axis potentially fast or with force.

Thanks,

Bill

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[GastonP]

I am 100% sure that one of the outputs from the yoke is just a pulse either going out from a sensor coil or a simple mechanical microswitch.

A simple reverse engineering of the input connectors to the dekatron box should lead you to the right one. I can lend a hand if you can get hold of simple schematics or a description of what you see.

Regards

   Gastón

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[Bill Notfaded]

Thanks GP I appreciate the offer.  I love dekatrons.  I'm hoping I can work the price down some.

Bill

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