Permanent Tile Segment Shape NdFeB Laminated Magnet Part No. HSLAMIM-09
Customzied Specific Requirements
Know as Lamination Magnetic Core
OEM or ODM service: Accept
Grade: 30H-48H, 30SH-45SH, 30UH-40UH, 28EH-38EH, 30AH-33AH…
Surface Treatment: Phosphate / epoxy
Tolerance: +/-0.02 – 0.05mm
Laminated Segment Magnets can reduce Eddy Current Loss in high Efficiency Motors
High efficiency demands the best materials, and the laminated rare earth magnets are proven to reduce eddy current losses in high efficiency motors. Fewer eddy current losses means lower heat and greater efficiency.
Technical requirement:
Laminated phosphating NdFeB/Neo rotor Magnet
1. The thinnest available insulating layers, <20 um;
2. Performance at temperatures up to 200˚C;
3. Magnet layers from .5 mm and up custom shapes and sizes in neodymium magnets.
Application scope:
Aerospace, Automotive, Motorsport, and Industrial Markets are turning to Laminated Rare Earth Square Magnets, and are working to balance the tradeoff between power and heat.
Calculation of eddy current losses with and without Lamination are shown below:
Laminated Magnets for eddy current reduction.
The permanent magnet eddy current loss caused by the space harmonics increased with the number of segments decreasing, and the permanent magnet eddy current loss caused by the time harmonics did not increase with the number of segments decreasing. So, when the motor is designed, especially designing the high speed motor, by using the magnet segmentation to reduce the eddy current loss in the magnets, first of all, consider output current waveform of the inverter and pay attention to the ratio between the pole axial length and the penetration depth of high harmonics waveform of current. Lastly, the compromise between cost of segmental magnetic pole and the magnitude of reducing the eddy current loss also needs to be considered; generally the numbers of segments do not exceed. Rectangular Lamination Permanent Magnet Transformer Core for Motor
Calculation and Analysis of Permanent Magnet Eddy Current Loss Fault with Magnet Segmentation, The first reason is that the axial split magnetic pole is equivalent to the oblique pole, and the air gap flux density waveform is improved; the other reason is that the sectional pole blocked the formation of eddy current loop, so the permanent magnetic eddy current loss decreased with the increased of number of segments. The source of excitation provided by the inverter contains a large number of harmonic components and higher harmonic amplitude. The depth of penetration of low order harmonic is larger and more than magnetic direction length, so it is not considered. However, the depth of penetration of high order harmonic is smaller and the skin effect is very strong, so permanent magnet eddy current loss produced by time harmonic will have a maximum value.
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