• Place of Origin:CN;ZHE
• Type:Permanent
• Composite:Rare Earth Magnet
• Application:Industrial Magnet
• Shape:SEGMENT
• Brand Name:SDM
• Model Number:SDMSS

Low Eddy Current Losses SmCo Segment Laminated Magnet

The magnet made by segmentation technology can be called laminated magnet, layered magnet, split magnet and segmented magnet. For magnet segmentation technology, the whole magnet will be segmented into several pieces, then processed into specific shape and dimension after glued together by special isolation glue.

What is the Advantages of Laminated Magnet?

According to many simulation cases and actual products, the magnet segmentation technique has excellent performance to prevent the eddy current. With the increase of segment, the eddy current losses of permanent magnet significantly decreased. Magnet segmentation technique has been already applied in the NdFeB and SmCo magnet. 

What is Eddy Current Losses laminated magnet

The consumption of motor is the greatest among the rotating machinery. The eddy current losses are one of the worst enemies to high-speed rare earth permanent magnet motor. The eddy current will give rise to the temperature of the rare earth permanent magnet, then the magnet will be demagnetized, therefore influence the work efficiency of the motor. As the metallic material, the rare earth permanent magnet has lower electrical resistance, and it also become the direct source of eddy current losses.

What is Skin Effect

The internal of metal with good conductivity will generate the induced electromotive force under the external changing magnetic field, and formed the eddy current inside the metal. The Joule heating effect of the induced eddy current lead to the above-mentioned eddy current losses. Actually, the eddy current concentrates mainly on the surface layer of the conductor. This phenomenon is known as the skin effect, and the basic reason is that the changing electromagnetic field generates an opposite vortex electric field inside the metallic conductor. The skin depth δ can be described as below relation:

Where μ is the permeability of conductor; ρ is the electrical resistance; ω is the angular frequency of alternating magnetic field, ω=2πf.The higher rotation speed, high permeability and low electrical resistance will cause lower skin depth and high losses.

How to reduce eddy current losses of rare earth magnet?
The eddy current loss of rare earth magnet can be reduced by many ways, among them, the material science researchers have proposed to prepare the high-resistivity magnet, such as:

a. Bonded magnet.

b. High-resistivity sintered magnet.

Due to the existence of binder, the electrical resistance of the bonded magnet would be 102 to 104 times more than simple sintered magnet, but the motor power and maximum operating temperate will be limited. For sintered magnet, submicron fluoride will be served as additive to enhance the grain boundary electrical resistance. Fluoride will help magnet to form a high resistivity layer on its grain boundary, thus improve the electrical resistivity of the whole material.

Magnet segmentation technology is a very practical way to make high-resistivity magnet without changing the composition of the magnet.

 Our Advantages:Laminated Magnet

1.Strategic cooperation with China’s No.1 rare earth miner CHINALCO, which enables us strong and safe backup for rare earth raw materials cost stability, 3 x -3% annual price down guaranteed.

2. ISO/TS 16949, VDA 6.3, ISO9001, ISO14001 certified company, RoHS, REACH, SGS, FDA complied product.

3. 0 PPM performance for General Motor's OEM since 2010, remarkable customers such as SIEMENS, BMW, REGAL BELOIT, NIDEC, ELECTROLUX, S&T Motiv.

4. Over 100 million magnets delivered to American, European, Asian and African countries.

5. One stop service from R&D to mass production.

SDM Workshops

SDM Quality AssuranceLaminated Magnet

As a professional laminated magnet manufacturer, we are certified by ISO9001:2008, ISO/TS16949:2009, RoHS, REACH, TUV, SGS

Products MagnetizationLaminated Magnet

We can do all the magnetization for laminated magnet including: Axial magnetization/Diametrical magnetization/Radial magnetization/Inner-diameter multi-polar magnetization/Outer diameter multi-polar magnetization/Surface magnetization/Complex magnetization/Encoder magnetization/Skewed magnetization.

In order to offer better understanding of these methods of magnetization, please see below explaination.

SDM ReliabilityLaminated Magnet

Demagnetization Curves and inspection report for each order for laminated magnet.

Standard Packing and Shipment

The package for laminated magnet we use:  Sea Pallet / Air Carton / Express Packaging / Plastic Tube / Wooden Case / Vacumm Package and any other packing terms as per your requirement

Shipping Details:

A: We have a discount price with Fedex and DHL. So if the weight is under 100Kg, you can those two shipping companies. But you can also choose TNT, UPS or any other shipping companies if you like. We'll use iron boxes to shield the magnetics force for air shipping.

B: When the weight is over 100Kg,we think sea shipping is more reasonable. We have our own forwarder, you can also entrust your own forwarder.

C: Anyway, we'll respect your choices.

Exhibitions

    CWIEME BERLIN every year, Germany

    HANNOVER MESSE every year, Germany

    CWIEME CHICAGO every year, USA

    You're more than welcomed to visit us at above exhibitions every year. We look forward to a face to face meeting with you.

Flexible Payment Terms

We accept payment by TT, Patpal, West Union and L/C

How to find us

Our manufacturing plants are located in Tonglu, Hangzhou which are only one hour by car from Hangzhou airport or railway station.

We are also only one hour by train from Shanghai or Ningbo, pickup and drop off at Hangzhou Air/Train stations are available if you are traveling to Hangzhou from other cities in China.

Company information

Company name: Hangzhou SDM Magnetics Co., Ltd

Foundation: Since 2004

Location: Hangzhou, China

Products: Sintered&Bonded NdFeB, Cast&Sintered Alnico, Sintered SmCo Magnets and relevant Magnetic Assemblies.

Certification: ISO/TS16949, RoHS, REACH, SGS

Customers: GM, BMW, BENTLY, SIEMENS and REGAL BELOIT and etc.

FAQ

1:How long will you give me the reply?
we will contact you in 12 hours as soon as we can.

2:Could I get samples?

Yes,we have materials in stock to help you to get the samples as soon as we can.

3:How about the quality of the magnets?

We have the certification of ISO,TS and ROSH,we could send the certification test of our company to you.

4:How is the price?

As we believe the quality is the most important,we will provide the best quality magnet we can with reasonable price.

5:Could you provide me the shortest lead time?

We have materials in our stock,if you really need,you can tell us and we will try our best to satisfy you.

6:Could I visit your factory?

Of course,if you need we will help you to visit our factory.

7:If I have paid,when will you help me to produce?

When we have received the money in our account,we will give you the receipt and arrange to produce immediately.

Description