发明授权
- 专利标题： Method for thermomagnetic encoding of permanent magnet materials
- 专利标题（中）： 永磁材料的热磁编码方法
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申请号： US345055申请日： 1994-11-25
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公开(公告)号： US5492572A公开(公告)日： 1996-02-20
- 发明人: Thaddeus Schroeder , John R. Bradley , Thomas A. Perry , Bruno P. B. Lequesne
- 申请人： Thaddeus Schroeder , John R. Bradley , Thomas A. Perry , Bruno P. B. Lequesne
- 申请人地址： MI Detroit
- 专利权人： General Motors Corporation
- 当前专利权人： General Motors Corporation
- 当前专利权人地址： MI Detroit
- 主分类号： C21D1/04
- IPC分类号： C21D1/04 ; C21D1/09 ; C21D1/34 ; G01D5/249 ; G01P3/487 ; G06K1/12 ; H01F1/03 ; H01F1/057 ; H02K1/27 ; H02K15/03 ; H01F1/04
摘要：
A magnetized or unmagnetized body of a permanent magnet material is heated in a pattern by a laser beam to a temperature sufficient to lower the coercivity of selected heated regions of the pattern and exposed to a magnetic field to magnetize or to remagnetize the selected heated regions. A pattern guide is used in the process to densify the pattern. In the process, energy is directed through the pattern guide and onto the selected regions, while the pattern guide prevents or minimizes heating of unselected portions of the body. Magnets so produced can have very high pole density, digital encoding and analog patterns having gradually varying local field strength.
公开/授权文献
- US4909308A Changeover valve for a central air conditioning unit 公开/授权日：1990-03-20
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