permanent magnets - goudsmit magnetics · permanent magnets play an important role in the present...

Driven by magnetism since 1959

Permanent Magnets

Goudsmit Magnetics - Driven by magnetism

Goudsmit Magnetic Supplies

Goudsmit Magnetic Supplies forms part of the Goudsmit Magnetics Group operating worldwide, a family business incorporated in 1959 with branches in The Netherlands, France, Germany, UK, Czech Republic and China. The company is specialized in delivering high quality permanent magnets and magnet systems to, among others, the automotive, electronics and medical industries.

Permanent Magnets

Permanent Magnets play an important role in the present technologically advanced living environment. They are indispensable in electrical engineering, with applications in, among others, generators, motors and relays.In the automotive industry the use of permanent magnets has also increased strongly in the last years, for example in air bags, ABS-systems and sensors. The number of applications keeps increasing on a daily basis. In addition the alternative energy sources

(wind, sun and water power) are an increasingly larger market for the application of magnets. Traditionally AlNiCo and Ferrite are the most commonly used, but the demand for smaller and more powerful magnets has resulted in the development of magnet types based on the so-called rare earth materials. Samarium Cobalt (SmCo) and Neodymium (NdFeB) permanent magnets; these develop enormous magnetic power at small dimensions and are available in a large diversity.

As one of the few European suppliers of magnets Goudsmit Magnetic Supplies is, in addition to being ISO 9001:2008 certified, also certified for ISO/TS 16949:2009 and makes optimal use of a worldwide operating distribution network. We can also offer you the support of our expert R&D and Quality engineers.

Neodymium (NdFeB) permanent magnets - table 1

page 3 Goudsmit Magnetics - Driven by magnetism

Neodymium (NdFeB)

Neodymium-Ferro-Boron (NdFeB) Magnets are delivered by Goudsmit under the brand name Neoflux®. It is the most powerful magnet, with a maximum energy product going up to even more than 50 MGOe. As protection against corrosion Neodymium magnets are provided with a coating that can consist of Nickel, Nickel-Copper-Nickel, Zinc, Tin, Aluminium, Teflon or Epoxy. These magnets are used, among others, in motors, megaphones, separators,

MRI scanners, windmills, electronics and vehicles, usually in combination with sensors.

Permanent Magnets

Grade

GSN-35GSN-38GSN-40GSN-42GSN-45GSN-48GSN-50GSN-52GSN-33MGSN-35MGSN-38MGSN-40MGSN-42MGSN-45MGSN-48MGSN-50MGSN-30HGSN-33HGSN-35HGSN-38HGSN-40HGSN-42HGSN-44HGSN-46HGSN-48HGSN-30SHGSN-33SHGSN-35SHGSN-38SHGSN-40SHGSN-42SHGSN-44SH

Corrosion stable

specify as

38H/S40H/S42H/S44H/S46H/S48H/S

35SH/S38SH/S40SH/S42SH/S44SH/S

Remanence

BrmT

min11701220126013001330137014101430114011701220126013001330137014101080114011701220126013001330136013801080114011701220126013001330

min870870870870900900830820830870900930950980101010308108308709009309509709801010810830870900930950970

min263279303318334358382398239263279303318334358382223239263279303318334350366223239263279303318334

typ11201260130013301370141014401480117012201260130013301370141014401140117012201260130013301360138014101140117012201260130013301360

typ920920920920930930850840859891915915915915980980810830870900930950970980106086088092095098010001020

typ279303318334358382398422263279303318334358382398239263279303318334350366382239263279303318334350

Normalcoercivity

HcbkA/m

Intrinsiccoercivity

HcjkA/mmin955955955955955875875875111411141114111411141114111411141353135313531353135313531353135313531592159215921592159215921592

Maximumenergy product

BH (max)kJ/m3

Max. operatingtemperature

°C80808080808080801001001001001001009090120120120120120120120120120150150150150150150150

Neodymium (NdFeB) permanent magnets - table 2


Permanent Magnets

Grade

GSN-28UHGSN-30UHGSN-33UHGSN-35UHGSN-38UHGSN-40UHGSN-28EHGSN-30EHGSN-33EHGSN-35EHGSN-38EHGSN-25AHGSN-28AHGSN-30AHGSN-25BH

Corrosion stable

specify as

30UH/S33UH/S35UH/S38UH/S40UH/S

30EH/S33EH/S35EH/S38EH/S25AH/S28AH/S30AH/S25BH/S

Remanence

BrmT

min 1040108011401170122012501040108011401170122097010401080950

min770810830 870900900770810830870900730770810710

min199223239263279302199223239263279180203220170

typ 108011401170122012601280108011401170122012601020108011401000

typ810860880920950950810860880920950770810860750

typ223239263279303326223239263279303200218250190

Normalcoercivity

HcbkA/m

Intrinsiccoercivity

HcjkA/mmin198919891989198919891989238723872387238723872787278727873000


BH (max)kJ/m3


°C180180180180180180200200200200200220220220230

Samarium-Cobalt permanent magnets


Samarium-Cobalt (SmCo)

SmCo magnets pertain, just like Neodymium-Ferro-Boron (Neoflux®) magnets, to the rare earth magnets. SmCo magnets have excellent magnetic characteristics with a maximum energy product of 18 to 30 MGOe, a low temperature coefficient and a high stability. Moreover they are very resistant to oxidation and require no coating under normal circumstances. SmCo magnets are the best choice, especially for applications where durability is of great importance.

For example within advanced electronic products, medical equipment and the automotive industry. The maximum usage temperature is approx. 300˚C.

Permanent Magnets

Grade

SmCo5GSS-20GSS-22Sm2Co17GSS-24GSS-26GSS-28GSS-30

Remanence

BrmT

min

850 890

920 1000 1040 1070

min

637 661

661 677 677 700

min

151 167

175 191 207 223

typ

950 1000

1040 1060 1100 1120

typ

756 772

796 820 820 828

typ

175 191

199 215 231 247

Normalcoercivity

HcbkA/m

Intrinsiccoercivity

HcjkA/mmin

1194 1194

1194 1194 1194 1194


BH (max)kJ/m3


°C

250 250

350 350 350 350

AlNiCo Permanent Magnet Specifications


AlNiCo

AlNiCo magnets are made of Aluminium, Nickel and Cobalt. Most AlNiCo magnets are cast, whereby the alloy is cast in a sand form in liquid state at very high temperatures. This can take place in complex forms, such as for example the form of a horseshoe. To prevent demagnetisation the correct length/diameter proportion must be maintained.

Permanent Magnets

Grade

Cast AlNiCoGSA-5AGSA-5BGSA-6GSA-7GSA-8AGSA-8BGSA-9AGSA-9BSintered AlNiCoGSAS-5GSAS-6GSAS-8

Remanence

BrmTmin

1200 12501300135080090010001080

11501100800

min

50525658110115110120

4858110

min

4044526038446080

342838

Normalcoercivity

HcbkA/m

Intrinsiccoercivity

HcjkA/mmin

52545860112117112122

5060112


BH (max)kJ/m3


°C

525 525525525550550550550

525525550

Ferrite Permanent magnets


Ferrite

Ferrite Magnets or ceramic magnets are the most used magnets with a maximum energy product from 1 to approx. 4.3 MGOe. Ferrite is the cheapest magnet material and has a high corrosion resistance, which means a coating is not necessary. Ferrite magnets can be produced both isotropic and anisotropic and the usage temperature is a maximum of 225˚C. The applications are very broad; think about products such as megaphones, microwaves,

measuring equipment, toys, motors, reed-contacts etc.

Permanent Magnets

Grade

IsotropicGSFD-10AnisotropicGSFD-25GSFD-30GSFD-33GSFD-40GSFD-42GSFD-44

Remanence

BrmT

min

210

380390390390415430

min

127

143175239271215247

min

6,4

252727283033

typ

240

400410410410435450

typ

159

175207271295239271

typ

9,5

293131323336

Normalcoercivity

HcbkA/m

Intrinsiccoercivity

HcjkA/mmin

211

147179243307219251


BH (max)kJ/m3


°C

225

225225225225225225

Plastic Bonded NdFeB permanent magnets - table 1

Plastic Bonded NdFeB permanent magnets - table 2


Plastic bonded NdFeB Magnets can be manufactured by means of pressing or extruding from basic material consisting of Ferrite, NdFeB, or SmCo. It is mixed with thermoplastic material, such as polyamide. The advantage is that it can be pressed or extruded in complex forms. Plastic bonded NdFeB magnets have a great resistance against corrosion, but it is still advisable to provide them with a coating so that the durability is optimal.

Due to the isotropy, the plastic bonded magnets can be magnetized in different directions.

Permanent Magnets

Plastic Bonded Neodymium

Grade

CompressionGSNB-6CGSNB-8ACGSNB-8CGSNB-8BCGSNB-8CCGSNB-9CGSNB-10CGSNB-11CGSNB-11ACGSNB-12AC

Grade

InjectionGSNB-3IGSNB-4IGSNB-5IGSNB-5AIGSNB-6IGSNB-6AIGSNB-7I

Remanence

BrmT

Remanence

BrmT

min

550600620620610650680700700740

min

200400450450510480540

min

285360385410410400420445400420

min

120250280300295335320

min

44566464647076807884

min

8283736444051

typ

620640690660650700720740740800

typ

400460510500560560640

typ

370400445465455440470480440455

typ

240335360360375400400

typ

56647272727684888492

typ

10364444525259

Normalcoercivity

HcbkA/m

Normalcoercivity

HcbkA/m

Intrinsiccoercivity

HcjkA/mmin

6007156408801190640640680520520

Intrinsiccoercivity

HcjkA/mmin

4805756408756401035640


BH (max)kJ/m3


BH (max)kJ/m3


°C

100110120150125120120120110110


°C

100110120150120130120

Goudsmit Magnetic Supplies B.V.Prunellalaan 14 • NL 5582 HB Waalre • The NetherlandsTelefoon: +31 (0)40 221 90 15 • Fax: +31 (0)40 222 02 56

www.goudsmitmagnets.com [email protected]

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