What is Halbach Array Motor

Halbach array motor

Halbach array is a new type of permanent magnet arrangement combined with the radial and tangential array, which can increase the magnetic field on one side of and weakened the magnetic field on the other side.
Using Halbach array in permanent magnet motor can increase the magnetic flux in the air gap and decrease the magnetic flux in the rotor yoke, and it is most suitable for the inner or outer rotor of the external permanent magnet.
At present, the permanent magnet motor is developing toward high power, high function, and miniaturization. The high power density and high efficiency are the basic requirements for all types of permanent magnet motor design.
According to the principle of magnet motor design, the increase of magnetic loading is to increase the motor gap magnetic flux density, which can reduce motor size and improve the power density.

Halbach array motor

For permanent magnet motor, generally, there are two measures to increase air gap flux density in the motor.
1. Change magnetic material: try to use permanent rare earth magnet with higher residual magnetic flux density. But restricted by magnet material performance and price, the actual alternatives are few.
2. Change magnet structure and arrangement

In brief, its application in the permanent magnet motor has great advantages:
1. The sine wave of air-gap magnetic field
2. Good magnetic shielding effect
3. High power density
4. Lightweight
5. Small in size

Neodymium magnets play a very important role in the renewable energy market. So we believe this magnet motor could find a broad range of industrial and automation applications, from electric vehicles, aerospace, independent power generation to other occasions.

The magnetic rotor assemblies are complex, including a wide variety of permanent magnets:
1. Samarium Cobalt (SmCo)
2. Neodymium Iron Boron
3. Ferrite
4. AlNiCo

Author: Maria Higgins

Welcome! I am a Standford Magnets engineer with over 10 years dedication to the R&D of licensed Rare-earth permanent magnets, Neodymium magnets and SmCo magnets, ceramic magnets, flexible magnets and magnetic assemblies since the mid of the 1980s. I shall keep you well informed of the leading-edge knowledge in the Magnets world.

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