Abstract
In this article, we present a permanent magnet dipole design with strong in-plane, open access magnetic field. The design starts with a Halbach structure. A pair of magnets with orientation opposite to the magnetic field of the Halbach dipole are added to cancel the effect of the two sections of the Halbach ring. The net result is equivalent to removing the two sections whose orientation is the same as the field in the gap. The final structure is a dipole with an open access air gap and a strong in-plane magnetic field. We analyzed the structure using current sheet method. We then used BEA (Boundary Element Analysis) software to simulate the structure. A prototype dipole was built. The field from the prototype dipole was measured and compared to the analytical and BEA results.
Highlights
THE MAGNET FIELDS FROM PERMANENT MAGNET DIPOLES CAN BE CATEGORIZED INTO TWO MAIN GROUPS: transverse magnetic field and axial magnetic field
It is often difficult to generate strong in-plane magnetic field with open access air gap as the magnetic flux will diverge to the open space from the region of interest
To evaluate the magnetic field of the resultant structure, a pair of magnets with orientation opposite to the magnetic field of the Halbach dipole are added to cancel the effect of the two sections removed from the Halbach cylinder
Summary
THE MAGNET FIELDS FROM PERMANENT MAGNET DIPOLES CAN BE CATEGORIZED INTO TWO MAIN GROUPS: transverse magnetic field and axial magnetic field. A magnetic field of 5.16 Tesla was achieved with a 2 mm air gap using radially oriented segments.. It is often difficult to generate strong in-plane magnetic field with open access air gap as the magnetic flux will diverge to the open space from the region of interest. The design presented in this study starts with a Halbach structure as the Halbach structure is the most efficient permanent magnet structure to generate strong magnetic field.. We remove the sections parallel to the magnetic field direction and split the Halbach cylinder into two halves to generate the open access air gap. To evaluate the magnetic field of the resultant structure, a pair of magnets with orientation opposite to the magnetic field of the Halbach dipole are added to cancel the effect of the two sections removed from the Halbach cylinder. The field from the prototype dipole was measured and compared to the analytical and BEA results
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