A Halbach array is a special arrangement of permanent magnets that augments the magnetic field on one side of the array while canceling the field to near zero on the other side. This is achieved by having a spatially rotating pattern of magnetization.
The rotating pattern of permanent magnets (on the front face; on the left, up, right, down) can be continued indefinitely and have the same effect. The effect of this arrangement is roughly similar to many horseshoe magnets placed adjacent to each other, with similar poles touching.
Magnet: Neodymium Magnet
Hardware part: 20# steel, martensitic stainless steel
Linear Halbach arrays:
Such as the brushless AC motor, voice coils, magnetic drug targeting to high-tech applications such as wiggler magnets which are used in Particle accelerators and Free-electron lasers.
Such as brushless AC motors, magnetic couplings, and high field cylinders. Both brushless motors and coupling devices use multiple field arrangements.
Halbach arrays are widely used in magnet rotors. Rare-earth permanent magnet motor is a new type of permanent magnet rotor, it began in the early 70s. And the rare-earth permanent magnet motor has a series of advantages, such as small size, light weight, high efficiency, and good characteristics. Its applications are very extensive and extend all over fields of aviation, space, defense, equipment manufacturing, industrial and agricultural production, and daily life.
Halbach arrays can be made by neo magnets. Sintered NdFeB magnet is one of the high-performance rare earth magnets, with high remanence, high coercive force, high energy product and high performance/cost ratio, It is easily produced into various sizes.
Sintered NdFeB magnets are widely used in high performance stepper, DC motors, servo motors, and linear motors, actuators, loudspeakers, headphones, electronic instruments, switches, relays, magnetic imaging for medical and geophysical applications, holding systems, magnetic bearings, magnetic couplings, hard disk drives, magnetic separator, magnetic lifter, other magnetic tools and so on.
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