Single dipole permanent magnet structure with linear gradient ma

Details Single dipole permanent magnet structure with linear gradient ma Single dipole permanent magnet structure with linear gradient ma

1997-10-22

1999-03-23

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335296, H01F 702

Patent

active

058866094

ABSTRACT:
A dipole permanent magnet structure having a rectangular gap about a longitudinal axis, in which tapered pole pieces form opposing sides of the rectangular gap to permit establishing a magnetic field in the gap. Permanent magnets having a rectangular shape are coupled to the rear, or base, of each pole piece, and have a magnetic field oriented in the same direction as the pole pieces, perpendicular to longitudinal axis, thereby establishing a magnetic field between the pole pieces. Additional permanent magnets, including a pair of blocking magnets, are coupled to the aforementioned permanent magnets to form a magnetic circuit. The orientation of the magnetic field of each permanent magnet is generally aligned in the direction of the lines of flux in the magnetic circuit to maximize the flux density within the air gap created by formation of the permanent magnets. Moreover, the pair of blocking magnets each form an opposing side of the rectangular gap adjacent to the pole pieces to prevent fringing. The pole pieces and blocking magnets are tapered along the longitudinal axis such that the rectangular gap narrows from the proximate end to the distal end of the gap. The structure is thus capable of generating a magnetic field having a linear range of flux densities from a relatively low flux density to a flux density greater than the residual flux density of the magnet material. Indeed, the gap flux density is limited only by the saturation flux density of the pole pieces. Thus, the permanent magnets can be made of magnet material having high coercivity and high saturation magnetization level. An embodiment of the magnet structure is capable of generating a magnetic field in the air gap having a flux density range of 0.5 Tesla or less to 2.0 Tesla or more.

REFERENCES:
patent: Re33736 (1991-11-01), Clarke
patent: 4549155 (1985-10-01), Halbach
patent: 4592889 (1986-06-01), Leupold et al.
patent: 4647887 (1987-03-01), Leupold
patent: 4654618 (1987-03-01), Leupold
patent: 4692732 (1987-09-01), Leupold et al.
patent: 4701737 (1987-10-01), Leupold
patent: 4764743 (1988-08-01), Leupold et al.
patent: 4810986 (1989-03-01), Leupold
patent: 4831351 (1989-05-01), Leupold et al.
patent: 4835137 (1989-05-01), Leupold
patent: 4835506 (1989-05-01), Leupold
patent: 4839059 (1989-06-01), Leupold
patent: 4859973 (1989-08-01), Leupold
patent: 4859976 (1989-08-01), Leupold
patent: 4861752 (1989-08-01), Leupold
patent: 4862126 (1989-08-01), Leupold
patent: 4862128 (1989-08-01), Leupold
patent: 4887058 (1989-12-01), Leupold
patent: 4893103 (1990-01-01), Leupold
patent: 4894360 (1990-01-01), Leupold
patent: 4911627 (1990-03-01), Leupold
patent: 4917736 (1990-04-01), Leupold
patent: 4928081 (1990-05-01), Leupold
patent: 4953555 (1990-09-01), Leupold
patent: 4994777 (1991-02-01), Leupold et al.
patent: 4994778 (1991-02-01), Leupold
patent: 5014028 (1991-05-01), Leupold
patent: 5028902 (1991-07-01), Leupold et al.
patent: 5034715 (1994-09-01), Leupold et al.
patent: 5041419 (1991-08-01), Leupold
patent: 5055812 (1991-10-01), Abele et al.
patent: 5063004 (1991-11-01), Leupold
patent: 5072204 (1991-12-01), Leupold
patent: 5075662 (1991-12-01), Leupold et al.
patent: 5162771 (1992-11-01), Abele
patent: 5347254 (1994-09-01), Leupold
Herbert A. Leupold and Ernest Potenziani II: An Overview of Modern Permanent Magnet Design; Research and Development Technical Report SLCET-TR-90-6; Aug. 1990.
Rollin J. Parker; Advances in Permanent Magnetism; John Wiley & Sons, Copyright 1990.
Lester R. Moskowitz; Permanent Design and Application Handbook; Cahners Books International, Inc., Copyright 1976.

Affiliated with

Also associated with

Rating

Single dipole permanent magnet structure with linear gradient ma does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Single dipole permanent magnet structure with linear gradient ma, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single dipole permanent magnet structure with linear gradient ma will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2130430