Bridge Type Segmentation Neo Laminated Magnet N42UH for High-Speed Motor Item No. MPCO-LAMN series
| Material | Sintered Neodymium-Iron-Boron (NdFeB) |
|---|---|
| Grade | N42UH |
| Shape | Arc/Segment |
| Dimensions | custom design |
| Coating | Nickel |
| Magnetization | Through Thickness |
| Tolerance | +/- 0.05 mm |
| Density | 7.40 ~ 7.70 g/cm3 |
| Weight | 38.33 g |
| Operating Temperature | 180 ℃ |
| Remanence (Br) | > 13.5 kGs, 1.35 T |
| Coercivity (HcB) | > 1022 kA/m, 12.8 kOe |
| Intrinsic Coercivity (HcJ) | >1990 kA/m, >25 kOe |
| Maximum Energy (BHmax) | 358 ~ 390 kJ/m3, 45 ~ 49 MGOe |
| Vickness Hardness | 500 ~ 700 HV |
| Compressive Strength | 1000 ~ 1100 MPa |
| Tensile Strength | 80 ~ 90 MPa |
| Bending Strength | 150 ~ 400 MPa |
| Thermal Conductivity | 8 ~ 10 W/(m·K) |
| Young’s Modulus | 150 ~ 200 Gpa |
| Electrical Resistivity C∥ | 1.4 ~ 1.6 μΩ·m |
| Electrical Resistivity C⊥ | 1.2 ~ 1.4 μΩ·m |
| Thermal Expansion C∥ | 4 ~ 9 x 10^-6/K |
| Thermal Expansion C⊥ | -2 ~ 10 x 10^-6/K |
MPCO MAGNET make Ndfeb magnets with grade from N35-N56, N35M-N54M, N35H-N54H, N35SH-N52SH, N35UH-N50UH, N33EH-N48EH, N30AH-N42AH, and SmCo magnet YXG24-YXG35, YXG24M-YXG33M, YXG28H-YXG33H. We can design, simulate, manufacture and assemble a variety of large and medium magnetic assembly and magnetic shielding assembly according to customer requirements. Phosphate Coating Lamination Permanent Magnet N42AH For Motors and Rotors
Eddy current is one of the biggest difficulties in the motor industry which will give rise to the temperature of permanent magnets and caused demagnetization, then affected the working efficiency of the motor. Laminated magnet is regarded as a wise solution to solve the eddy current loss in the surge of high-speed rotating machinery development.
Eddy Current Loss of Permanent Magnets
In most cases, the eddy current loss of permanent magnets is much lower than iron loss and copper loss of the motor, but it will generate a large temperature rise in the high-speed motor and the high power density motor.
Ideally, stator magnetic field and rotor magnetic field of PMSM are rotating synchronously, or relatively static, thus permanent magnets without eddy current loss in such case. In fact, there are a series of space and time harmonics are existing in the air gap magnetic field, and these harmonic components are stemming from cogging effect, non-sinusoidal distribution of magnetomotive force and phase current. The harmonic magnetic field will link with rotor magnetic field and hence generated eddy current and caused relevant eddy current loss. It should be also noted that the harmonic magnetic field and eddy current loss will rise with increasing motor speed.
About Laminated Magnet
Laminated magnet is made by bonding several pieces of thin magnets together via special isolation glue which also be called magnet segmentation technology, and thus dramatically reduce the eddy flux loss of the magnets without changing the structure and performance of the motors. Either laminated SmCo magnets or laminated Neodymium magnets are available. Actually, puzzles existing in the development of laminated magnet are the assembly process and consequently high costs. MPCO has collected much experience via some axial flux motor projects.
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