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Measurement System of Ferromagnetic Particles

[Category : - OTHER- Motors]
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In a channel where the liquid under measurement lies or flows, an alternating magnetic field, composed of two spectral components is generated; in a way that the lower frequency component acts along the channel asymmetrically with respect to higher frequency component. The intensity of lower frequency component is chosen so hight, that it magnetizes the ferromagnetic particles in liquid into nonlinear region of magnetizing curve, which causes lowering of intensity of higher frequency component in this part of channel. The asymmetry of higher frequency component along the axis of the channel is measured using a gradiometric coil – this asymmetry is proportional to concentration of ferromagnetic particles in channel.

Besides the technical solutions described in patent documents, additional solutions essential for realization of invention have been elaborated, e.g. for suppression of influence of electromagnetic disturbances, of temperature variations; means for adjustment of coil system etc.

Benefits

– The liquid to be measured can flow continuously through the device; no need to empty the channel periodically for determination of “no ferro”-level in signal.

– The method is selective to ferromagnetic particles.

– The output voltage of the measuring device is not proportional to inductance of coils; inductance variation is only a second order factor.

– Tuning the of coil system into optimal working position is possible without emptying the channel – tuning is possible by monitoring the amplitude of higher frequency component in amplified signal, this components depends in typical applications little on concentration of ferromagnetic particles in channel.

Prototype

In the last prototype (channel Ø10 mm) detection resolution of ?10 mgFe/l achieved. Through optimization and use of digital signal processing resolution of 0,1 mgFe/l is expected.

For comparison: In lubrication oil in combustion engines the ferromagnetic particles concentration can reach 200 mgFe/l and in gearboxes up to 1500 mgFe/l.

The size of the prototype was ca 1 dm³ and its power consumption was under 30 W (supply ±15 V).

Financial information

Applications

Continuous monitoring of power machines: determination of wear; early detection of damage.

Business prospects

There are in operation in the world:
– over 20 000 paper mills, mill trains, cement plants and large power plants;
– over 40 000 cargo ships;
– over 20 000 passenger airplanes for over 30 passengers.

One produces in the world annually:
– over 160 000 diesel engines for boats;
– over 18 000 000 motor trucks.

Other applications:
– gears of large wind mills;
– mills and rotary furnaces;
– hydraulic machines.

A typical device for measuring of particle content in lubrication oil costs ca 1000 $.
If only 0,1 % of the listed machines will be provided with the device according this invention every year, the revenue could well reach millions of $ annually.

Besides the patent, also prototype and unpublished know-how will be sold.

Patent publications:

US 9030193

Asking price:

80,000 USD

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Seller:

hemeltron (Finland)

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