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� No More Shielded Cables for Motors Because of Nanocrystalline Absorbers Hans-Joachim Poess www.magnetec.de 20160122

No More Shielded Cables for Motors because of Nanocrystalline Absorbers

State of the art

Cables are needed to transfer the Energy

Shielded cables

They are needed to reduce radiated

emissions

Radiated emissions

Why they have to be eliminated

CoolTube

Nanocrystalline Absorbers eliminates the emissions


Cable

How did I get to Cable …

The Half Epic MTB ride 2015 in Cable Wisconsin.

… by luck

I´m not a specialist of Cable but I like

Mountain biking and Nanocrystalline Materials.


Pictures

Enter your sub headline here

Variable Frequency Drivescreates EMC – noise


Conducted emissions

Measured by Rogowski coils


Pictures


Variable Frequency Drivescreates EMC – noise conducted and radiated

depending on the cable length and types

Source of pictures http://epa.de http://pe.org.pl/articles/2012/1b/39.pdf

http://www.belden.com/docs/upload/vfd_choosing_wp.pdf


http://www.belden.com/docs/upload/vfd_choosing_wp.pdf

What is important for the cables to

minimize radiated emissions:

Symmetric cables

Shielding of the whole cable

Shielding parts of the cable

The best would be to avoid the radiation

Is this possible ?



Test the part

OKThe root cause of the radiated emissions is the switching of the IGBT´s

Most important is the dU/dt

The switching frequency is how often it happens

Harmonics of the dU/dt are in the Megaherzrange up to Gigaherz

Interference with other machines

Solutions: Distance; Shielding; Absorption


http://pe.org.pl/articles/2012/1b/39.pdf

Inverter

Grid with Impedances and interaction of noise


http://en.tdk.eu/tdk-en/373562/tech-library/articles/applications---cases/applications---cases/never-again-shielded-cables/172050


Solution: Inductor Tube


http://en.tdk.eu/tdk-en/373562/tech-library/articles/applications---cases/applications---cases/never-again-shielded-cables/172050

Reduce noise level without shielded motorcable

Target:


Starting of investigation

150 m unshielded

motor cable

First solution

block of Nanoperm

Cores M-649

with 3 turns

Inductor

DriveMotor

150 m unshielded cable


Without choke

And 150 m

Unshielded motor cable

Stacked Nanoperm Cores M-649 with 3 turns

Inside of the requested standard limits

Above the requested standard limits



Radiated Noise measurement Drive with Motor cable

50 m motor cable up to 150 motor cable and more

Frequency rang 100 Kilohertz up to 1 Gigahertz


Nanocrystalline Absorbers:

Produced from amorphous tape nanocrystallized

while 10 hours annealing under Hydrogen at about 600 °C and magnetic field


Special stacked Nanocrystalline Cores

Annealed for High frequencies in the range up to 1 Gigaherz

Working already from nearly Direct Current DC

Easy to mount

Function is the combination of an Inductor and an Absorber

Changing dangerous emissions to safe thermal energy

Prototype


Drive

About 3 kWMotor cable

unshielded up to

150 m

Motor

Nanocrystalline Absorber

Trademark CoolTube


2017 Fieldtest for the whole rang e

up to 1,2 MW

2016

4. QuarterFieldtests up to 315 kW

2016

3. QuarterFieldtests for

Up to 75 kW

2016

2. QuarterFieldtests for

Up to 30 kW.

2016

1. Quartermore Fieldtestsfor up to 3 kW.

Roadmapping

Nanocrystalline Absorbers:

Prototype


Websearch: magnetec cooltube

USA http://www.coolblue-mhw.com/

More info´s under


Hans-Joachim

PoessHead of Development

Magnetec GmbH

Industriestrasse 7

D- 63505 Langenselbold

Germany

Tel. +49 6184 9202-12

[email protected]


Tape wound core made out of a melt


What is the effect of the Inductive Absorbers ?

Without inductive Absorbers With inductive Absorbers


Calculation Imax Nanoperm of µr

H= I*N/lfe magnetic field (A/m)

B=µ0*µr*Imax*N/lfe magnetic induction (Vs/Am)

B=µ0*µr*H

Imax= (B*lfe)/(µ0*µr*N)

B= 1 Vs/Am

material constant Nanoperm (1,2T) 20 % savetymargin

µ0= 4*pi*10^-7 Vs/m² constant

µr – relative Permeability; N=turn no.

Lfe – middle pathlength)


Dimensioning Imax calculation

Imax= (B*lfe)/(µ0*µr*N)

Examples on one core dimension

63x50x30 mm

Imax (µr=30000) = 4,8 A

Imax (µr=1000) = 143A

Imax (µr=500) = 286 A

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