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sharath4
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India - Member - Proud to be INDIAN Engineering Fields - Power Engineering - New Member

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Location: Bengaluru, India
Posts: 91

Identification of Magnets

07/20/2011 2:01 AM

Hello everybody,

I have one permanent magnet motor. I found that the rotor is having NdFeB magnets. Now i am in confusion that whether it is sintered NdFeB magnet or bonded NdFeB magnet? So i am thinking how to identify this. Is it possible only by measuring Magnetic flux density value of magnet?



Hoping for your valuable suggestions


Regards,
sharath

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rakesh_semwal
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#1

Re: Identification of Magnets

07/20/2011 10:59 AM

Sintered type are normally plated and give high flux density, on other hand bonded magnet will have some color like brown depending on the resin used for bonding, and will show lower magnetic flux density than of former one.You can also differentiate them by scratching or by checking hardness.
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sharath4
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#2
In reply to #1

Re: Identification of Magnets

07/21/2011 1:51 AM

Dear Rakesh,

Thank you very much for your suggestion. But the magnet is assembled in rotor, so neither i can scratch it nor open it to check its hardness. so what can i do for it?

Please excuse me if my question is very basic.

Regards,

sharath

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suresh sharma
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Join Date: Dec 2007
Location: Mumbai, India
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#3

Re: Identification of Magnets

07/21/2011 7:53 AM

I understand it is high torque motor which mostly used for feeding rolls in machine. Why you want to study rotor magnets?. Is motor under breakdown?. Better contact mfr.

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sharath4
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Location: Bengaluru, India
Posts: 91
#4
In reply to #3

Re: Identification of Magnets

07/22/2011 2:01 PM

I have measured the flux density value of the magnet by gaussmeter. The magnetic flux density value on the surface is coming in the range of 400 to 500 mT. so i can consider it as sintered NdFeB magnet, since sintered magnets give more energy product than bonded.

Am i right?

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