where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

ZETEC, Inc.
Zetec is a global leader in nondestructive testing (NDT) solutions for the critical inspection needs of industries the world counts on every day, ...
629 views
Technical Discussions
Massimiliano Pau
Teacher, -
Univ. of Cagliari, Dept. of Mechanical Engineering, Italy, Joined Sep 2002, 25

Massimiliano Pau

Teacher, -
Univ. of Cagliari, Dept. of Mechanical Engineering,
Italy,
Joined Sep 2002
25
08:22 Jan-17-2002
Problems with electromagnetic fields

Dear friends

I'm carrying out some UT immersion test on a aluminium wheel driven by an electric motor.

Unfortunately the signal is very disturbed by "spikes" generated by the motor. Any suggestion in order to reduce (or eliminate) this problem?

Thanks in advance

Massimiliano Pau


 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 526

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
526
00:42 Jan-17-2002
Re: Problems with electromagnetic fields
Simple things to try

1. Move or Shield the power to the motor - make sure the motor wires are not less than 10cm from the probe connections. Check grounding etc. - Thry linking the probe body to the motor case. If its already joined try disconnecting it (These things are seldom rational until you've solved them)

2. Put some capacitors across the motor contacts - 0.1 uF low impedance type should reduce most spikes. Wrap the power leads round a toroid or use series inductors

3. Move the motor - Drive the mechanism via a belt and pulleys (Usually necessary anyway to keep the motor out of the water)

4. Make Sure the motor power supply is not contributing - Some switched mode power supplies can kick out a lot of noise.- Do you get spikes when the voltage is reduced and the motor not turning? If so its not the motor...

Good luck

Joe


4. If all else fails use an AC shaded pole motor or similar -


: Dear friends
.
: I'm carrying out some UT immersion test on a aluminium wheel driven by an electric motor.
.
: Unfortunately the signal is very disturbed by "spikes" generated by the motor. Any suggestion in order to reduce (or eliminate) this problem?
.
: Thanks in advance
.
: Massimiliano Pau
.



 
 Reply 
 

Product Spotlight

Research Center IDEKO develops an ultrasonic train wheel inspection system for CAF

The Basque Research centre IK4-IDEKO has developed a state-of-the-art ultrasonic inspection system f
...
or the train wheel. This system secures a sound condition of train wheels and is thus a significant contribution to rail transport safety. The device was delivered to CAF recently and its use allows the manufacturer to become an approved supplier of rolling stock in Italy, as it meets the demanding homologation standards of this country. \\\\r\\\\n
>

NDTkit RT

NDTkit RT, TESTIA's Digital Radiography software The NDTkit product line software for X-ray analysi
...
s. NDTkit RT is a software benefiting from the Ultis kernel which is dedicated to radiographic image analysis. It offers a set of tools and filtering processes to assist RT operators in finding relevant flaws.
>

GEKKO - Portable Phased Array Testing with TFM in Real-Time

The portable phased array testing system GEKKO provides 64 parallel test channels. On creating testi
...
ng parameters the operator is assisted by the CIVA software. Due to its modular set-up the GEKKO instrument is suitable for operators of all skill levels.
>

Research and Applications Development For NDT

The Research and Applications Development (RAD) group is a newly formed team within Acuren dedicat
...
ed to tackling challenging inspection problems. Our focus is the development of novel, field deployable, advanced inspection techniques for use in cases where standard NDT methods are ineffective. We don't wait for new innovations, we engineer them. From concept to commissioning.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window