Source: https://patents.google.com/patent/US20080211324A1/en
Timestamp: 2019-12-10 23:17:20
Document Index: 534492582

Matched Legal Cases: ['Application No. 0300657', 'Application No. 60', 'art 30', 'art 30', 'arts 21', 'art 30', 'arts 21', 'arts 21', 'art 30', 'arts 21', 'art 21', 'art 22', 'arts 21', 'arts 21']

US20080211324A1 - Linear motor - Google Patents
US20080211324A1
US20080211324A1 US12/119,321 US11932108A US2008211324A1 US 20080211324 A1 US20080211324 A1 US 20080211324A1 US 11932108 A US11932108 A US 11932108A US 2008211324 A1 US2008211324 A1 US 2008211324A1
US12/119,321
US7884508B2 (en
2003-03-10 Priority to SE0300657 priority
2008-05-12 Priority to US12/119,321 priority patent/US7884508B2/en
2008-05-12 Application filed by Hoganas AB filed Critical Hoganas AB
2008-09-04 Publication of US20080211324A1 publication Critical patent/US20080211324A1/en
2011-02-08 Publication of US7884508B2 publication Critical patent/US7884508B2/en
239000000696 magnetic material Substances 0 abstract claims description 28
239000006247 magnetic powder Substances 0 abstract claims description 28
239000011162 core materials Substances 0 abstract description 135
This application claims benefit of Swedish Patent Application No. 0300657-4, filed Mar. 10, 2003, U.S. Provisional Application No. 60/476,196, filed on Jun. 6, 2003, and is a divisional of U.S. patent application Ser. No. 10/792,803, filed on Mar. 5, 2004, which is now U.S. Pat. No. ______, and incorporates these applications by reference in their entireties.
The stator 12 of the linear motor 10 includes an additional part, an inner stator part 30. The inner stator part 30 may be a tube that is positioned inside the stator parts 21 a-c and 22 a-c, leaving a space between an outer perimeter of the inner stator part 30 and an inner perimeter of the stator parts 21 a-c and 22 a-c. The function of the inner stator part is to act as a part in a magnetic circuit which the stator parts 21 a-c and 22 a-c also are part of. The inner stator part 30 may be made of the same soft magnetic material and by using the same technique as the rest of the stator, which is described above. The inner stator part is arranged to keep its position in relation to the stator parts 21 a-c and 22 a-c.
In FIGS. 5 and 6 there is shown a stator core 20 according to one embodiment. As mentioned above the stator core 20 is divided into two separate stator parts, a first stator part 21 and a second stator part 22. The stator core 20 has an inner perimeter 50, an outer perimeter 52, and a splitting plane 54. The inner perimeter should be understood as a line that defines an inner boundary of the stator core 20 and the outer perimeter should be understood-as a line that defines an outer boundary of the stator core 20. This stator core may also be described as having the shape of a circular ring. In the figure the outer perimeter 52 encircles the inner perimeter 50, however, the stator core 20 may include gaps extending radially through the stator core 20 and still be thought of as having an outer perimeter encircling an inner perimeter, at least essentially encircling an inner perimeter. The splitting plane 54 is the plane resulting from dividing the stator core into two stator parts 21, 22.
The splitting plane 54 of the stator core 20 maybe arranged at an equal axial distance from a first surface 66 of the stator core facing axially and a second surface 68 of the stator core facing axially in the opposite direction. If the teeth 56 and 58 extends axially along the inner perimeter by the same axial distance and the splitting plane 54 is arranged as previously mentioned the two stator parts are identical and one set of manufacturing tools may be used to produce them. Accordingly, the initial cost of producing a stator may be reduced in relation to a stator requiring two different sets of tools for producing the different stator parts 21 and 22.
The permanent magnets 34 a-c are arranged with their poles N and S facing in an axial direction. Also, the permanent magnet sections 34 a-c are arranged so that a north pole N of a permanent magnet section, e.g. permanent magnet section 34 b, is facing a north pole N of an adjacent permanent magnet section, e.g. permanent magnet section 34 c. Accordingly the south pole S of a permanent magnet section is facing a south pole of an adjacent permanent magnet section, e.g. permanent magnet sections 34 a and 34 b. This results in that the soft magnetic sections 32 a-d may act as magnets with a radially directed polarization vector.
1. Mover for a linear motor, said mover comprising at least one section of soft magnetic material and at least one permanent magnet, said at least one section of soft magnetic material and said at least one permanent magnet being aligned in an axial direction of the mover, wherein a polarization vector of said at least one permanent magnet is directed axially.
2. Mover according to claim 1, wherein said section made of soft magnetic material is made of soft magnetic powder.
5. Mover according to claim 1, wherein the mover is tubular.
6. Mover according to claim 1, wherein said at least one section of soft magnetic material is provided with at least a first axial end having an end surface and wherein said at least one permanent magnet is arranged in contact with essentially the entire end surface of said first axial end.
7. Mover according to claim 1, wherein a circumferentially and axially extending surface of said at least one permanent magnet is arranged essentially flush with a circumferentially and axially extending surface of the mover that is arranged to face an intended stator.
8. Mover according to claim 2, wherein the mover comprises at least two permanent magnets, a first permanent magnet and a second permanent magnet, that are aligned in said axial direction and wherein the distance between the axial center of said at least two permanent magnets is 0.75 to 1.5 times the pitch of a prospective stator.
US12/119,321 2003-03-10 2008-05-12 Linear motor Expired - Fee Related US7884508B2 (en)
SE0300657 2003-03-10
US10/792,803 Division US7378763B2 (en) 2003-03-10 2004-03-05 Linear motor
US20080211324A1 true US20080211324A1 (en) 2008-09-04
US7884508B2 US7884508B2 (en) 2011-02-08
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