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Arc Laminated Samarium Cobalt Magnets for Eddy Current Losses

/Arc Laminated Samarium Cobalt Magnets for Eddy Current Losses
  • ARC Laminated Samarium Cobalt Magnets

Arc Laminated Samarium Cobalt Magnets for Eddy Current Losses, High Temperature Segment SmCo Laminated Magnet,  Lamination SmCo Magnets For Reduce Energy Loss in High Efficiency Motors, sintered SmCo rare earth laminated magnets, Magnet Segmentation Technology

Arc Laminated Samarium Cobalt Magnets for Eddy Current Losses Part No. HSLAMIM-18
Customzied Specific Requirements
Know as Lamination Magnetic Core
OEM or ODM service: Accept
Dimension: Customized size
Custom Grade: SmCo5,  Sm2Co17
Magnetization direction: Thickness, Length, Axially, Diametre, Radially, Multipolar
Surface Treatment: UNCOATED, Silver, Gold, Zinc, Ni-cu-Ni. Epoxy etc.
Tolerance: +/-0.02 – 0.05mm
Application: SmCo rare earth permanent magnets are widely applied in Auto, energy-efficient Motors and Generators, Machinery, Audio/Video and Communication Equipment, Medical Device(MRI), Office Automation, Magnetic Separator, etc.

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.

The fewer the eddy current loss becomes, the lower the heat generates to enhance higher efficiency. Nowadays the demand of laminated rare earth magnets has been going up, because aerospace, industrial markets and promising EV especially are dedicating to pursuing the balance between motor power and heat.  Custom Drawing Design Block Insulated Magnet Thanks to knowledge in electric motor and extensive experience in laminated magnets, Horizon can work with customers to improve motor performance through ensuring laminated magnets with following characteristics:

Stable working at temperature up to 200˚C
Consistency of insulation guaranteed
Insulation layer ranging 25 -100 μm
Magnet layer with thickness from 0.5mm and up in a wide of shapes like block, loaf, segment and wedge
Magnet material in SmCo or Neodymium

Samarium Cobalt magnets (SmCo) may be weaker than NdFeB magnets at room temperature but SmCo will often outperform NdFeB above +150 to +180 deg C (subject to the application and grade). SmCo magnets are ideal for aerospace, automotive, sensor, loudspeaker, motor and military applications. In mission critical applications they are an ideal first choice. SmCo magnets offer minimal change in magnetic output over a small temperature change (with far less variation than NdFeB or ferrite; only Alnico is better). The Low Temperature Coefficient (LTC) versions have less variation in magnetic output with temperature change (due to added Gd and Er). SmCo magnets performance over a massive range of temperatures (from near to -273 deg C up to +350 deg C). The H versions Sm2Co17 have higher Hci and operate up to +350°C rather than +300°C.SmCo and NdFeB could be interchangeable e.g. SmCo30 should perform very similarly to N30 at ambient temperature. ISO / IATF Certificated High Temperature Segment SmCo Laminated 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.
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.

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