Patent
Magnetic field generator
| العنوان: | Magnetic field generator |
|---|---|
| Patent Number: | 8,674,797 |
| تاريخ النشر: | March 18, 2014 |
| Appl. No: | 13/144996 |
| Application Filed: | February 26, 2010 |
| مستخلص: | There is provided a magnetic field generator in which separation and dislocation of permanent magnets from their permanent magnet groups is prevented easily and reliably for a long period of time without sacrificing productivity. A magnetic field generator 10 includes a permanent magnet group 14a which is provided on a plate yoke 12a; a pole piece 16a which is provided in a first main surface of the permanent magnet group 14a, leaving an exposed region 18b thereon; a frame-like member 34 which is provided on the plate yoke 12a to surround the permanent magnet group 14a; and a flange-shaped member 36 which is provided in the pole piece 16a to cover the exposed region 18b. Presser bolts 44 are threaded into the frame-like member 34 and press an outer circumferential surface 18a of the permanent magnet group 14a directly or via insertion members 42. Presser bolts 48 are threaded into the flange-shaped member 36, and press the exposed region 18b of the permanent magnet group 14a directly or via insertion members 46. A plate yoke 12b has the same configuration. |
| Inventors: | Aoki, Masaaki (Takatsuki, JP); Kishimoto, Michiaki (Takeo, JP) |
| Assignees: | Hitachi Metals, Ltd. (Tokyo, JP) |
| Claim: | 1. A magnetic field generator comprising: a permanent magnet group including a plurality of permanent magnets bonded together, for generation of a magnetic field on a first main-surface side of the permanent magnet group; a cover member including a frame-like member provided to surround the permanent magnet group; a block-like insertion member for insertion into a gap between the permanent magnet group and the frame-like member; and a pressing member provided in the frame-like member for pressing the permanent magnet group; wherein the pressing member is threaded into the frame-like member and presses the insertion member to an outer circumferential surface of the permanent magnet group, thereby fixing the permanent magnet without coming into direct contact with the permanent magnet. |
| Claim: | 2. A magnetic field generator comprising: a permanent magnet group including a plurality of permanent magnets bonded together, for generation of a magnetic field on a first main-surface side of the permanent magnet group; a plate yoke provided with the permanent magnet group; a cover member including a frame-like member provided to surround the permanent magnet group; wherein the frame-like member includes a plurality of frame-like member pieces; an insertion member for insertion into a gap between the permanent magnet group and the frame-like member; a pressing member provided in the frame-like member for pressing the permanent magnet group; wherein the pressing member is threaded into the frame-like member and presses the insertion member to an outer circumferential surface of the permanent magnet group, thereby fixing the permanent magnet without coming into direct contact with the permanent magnet; and a reinforcing member provided in the frame-like member; wherein the reinforcing member includes at least one of a first top plate provided at an upper portion of the frame-like member piece, a second top plate provided at an upper corner portion of the frame-like member piece, a bottom plate provided at a lower corner portion of the frame-like member piece, a plate-like member provided on a side surface of the frame-like member piece, and an L-shaped member provided to abut on a side surface of the frame-like member piece and on the plate yoke. |
| Claim: | 3. The magnetic field generator according to claim 2 , wherein the reinforcing member includes the first top plate; the magnetic field generator further including an insertion member for insertion into a gap between the first top plate and the permanent magnet group; wherein the insertion member is made of a magnetic material selectively. |
| Claim: | 4. The magnetic field generator according to claim 1 or 2 , wherein the pressing member presses the permanent magnet group, thereby preventing separation of the permanent magnet from the permanent magnet group. |
| Claim: | 5. The magnetic field generator according to claim 1 or 2 , further including a pole piece provided in the first main surface of the permanent magnet group while leaving an exposed region in the first main surface; wherein the cover member includes a flange-shaped member provided in an outer circumferential surface of the pole piece to cover the exposed region of the permanent magnet group; and the pressing member is also provided in the flange-shaped member for pressing the permanent magnet group. |
| Claim: | 6. The magnetic field generator according to claim 1 or 2 , wherein the cover member is a non-magnetic member. |
| Current U.S. Class: | 335/306 |
| Patent References Cited: | 4217568 August 1980 Chiba et al. 4672346 June 1987 Miyamoto et al. 6198286 March 2001 Trequattrini et al. 6452472 September 2002 Aoki 6664878 December 2003 Chen et al. 6781495 August 2004 Aoki et al. 6828891 December 2004 Jarvis et al. 6897751 May 2005 Aoki et al. 7463129 December 2008 Danby et al. 7796002 September 2010 Hashimoto et al. 2002/0062884 May 2002 Kaneko 2004/0145436 July 2004 Strom 2004/0194288 October 2004 Lochner 2004/0194289 October 2004 Zheng 2004/0246083 December 2004 Aoki et al. 2008/0100406 May 2008 Hashimoto 60-71112 May 1985 60-239005 November 1985 60-257109 December 1985 61-152956 September 1986 63-107006 May 1988 8-336273 December 1996 10-275720 October 1998 11-186013 July 1999 2001-46351 February 2001 2001-326118 November 2001 2002-190404 July 2002 2003-168604 June 2003 2003-293008 October 2003 2004-305743 November 2004 2004-305746 November 2004 2004-358097 December 2004 2008-279265 November 2008 |
| Other References: | International Search Report for International Application No. PCT/JP2010/053166 dated Mar. 15, 2010. cited by applicant Extended European Search Report mailed May 13, 2013 in counterpart application No. 10746348.1 (9 pages). cited by applicant |
| Primary Examiner: | Musleh, Mohamad |
| Attorney, Agent or Firm: | Kratz, Quintos & Hanson, LLP |
| رقم الانضمام: | edspgr.08674797 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |