Multipolar Isotropic Ferrite Ring Permanent Magnet, Ceramic Multi-pole Magnets, motor rotor permanent ring magnets, Radially Orientation Multi-polar Magnetic Ring, Anisotropic hard ferrite magnetic rings for electronic motors Multipolar Isotropic Ferrite Ring Permanent Magnet Features: Specification size: custom design drawing Magnetizing mode: Radial 6 poles Type: Permanent Magnet Tolerance: +0.1mm Composition: Sintered Ferrite Magnet (hard ceramic) […]
Laminated SmCo Magnet Segmentation Technology, Laminated Samarium Cobalt Magnets for Eddy Current Losses, High Temperature Segment SmCo and NdFeB Laminated Magnet, Lamination SmCo Magnets For Reduce Energy Loss in High Efficiency Motors, sintered SmCo rare earth laminated magnets, Magnet Segmentation Technology
Laminated SmCo Magnet Segmentation Technology Part No. HSLAMIM-19
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
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.
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. Arc Laminated Samarium Cobalt Magnets for 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.