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Radial Flux Motors Permanent Magnet Lamination, radial flux BLDC motor block laminated magnets, Lamination strong sintered NdFeB magnets for new-energy Auto, AC Laminated Frame RPMAC Motors, Industrial electric motors magnet
Radial Flux Motors Permanent Magnet Lamination Part No. HSLAMIM-27 – Laminated magnet is to cut the whole magnet into many small pieces of magnet, and then use specific glue to bond together. These small magnets are insulated from each other and enable to cut down electromagnetic eddy current.
When the permanent magnet motor is running, the motor will generate harmonic and the magnets themselves will generated skin effect, these all will bring a lot of eddy current loss, and then the temperature of permanent magnet rises, which results in irreversible demagnetization and affects the safety and stability of motor operation. So, the design of laminated magnet assembly is able to cut down risk and loss, however to improve the efficiency of motor.
The eddy current simulation experiment of different piecemeal permanent magnets
Experiment: NdFeB N35UH magnet, dimensions: 20*160*5MM
Magnets are tested at different excitation frequencies in a non-piecewise and piecewise manner .
Testing results :
The eddy current loss of magnet decreases with the increase of magnet segments
The thickness of insulating layers is within 0.04mm
In normal temperature, the bond strength of insulating layers can reach more than 50MPa
The maximum working temperature can reach 200°C
The whole geometric tolerance is within 0.05mm
These small magnets are insulated from each other
Reducing electromagnetic eddy current
Remaining the same magnetic properties with the whole magnet or ever superior
On a radial flux BLDC motor, the magnets are positioned such that their poles lie radially at the outer edge of the rotor. The magnetic flux from the magnets interacts with the windings of the stator. The flux loop starts at the first permanent magnet on the rotor, crossing the air gap between the rotor and stator. It then passes through the first metal tooth on the stator. The flux flows along the steel core of the stator until it passes through a second tooth on the stator, then flowing back to the second magnet on the rotor. Laminated Type Magnet for Axial-Flux Motors and Generators
There is another way, which is loosely based on a design that Nicola Tesla researched and patented in 1889. An axial flux motor places the permanent magnets on the face of the rotor, and puts the stator in front of the rotor. To balance the magnetic forces, two rotors are often used—one on either side of the stator. The flux loop starts at a magnet on the rotor and passes through the air gap between rotor and stator. The flux passes axially through the first stator tooth and immediately arrives at a second magnet (when dual rotors are used). Unlike the radial flux motor, the flux path is one-dimensional, allowing the use of grain-oriented magnetic steels for greater efficiency.