Title:
【発明の名称】磁気変換素子及びその製造方法
Document Type and Number:
Japanese Patent JP2003531368
Kind Code:
A
Abstract:
A magnetic transducer element is formed in a portion (22) of a shaft (20) by an axially-oriented magnetic source (30) comprising a U-shape permanent magnet or electromagnet assembly, the gap (g) between the poles of which is small compared to the pole width (w). The source (30) is brought up to the continually rotating shaft (20) from a distance (D1) to a position closely proximate (D2) the shaft (20) and then retracting the source (30). With an electromagnet the mechanical movement may be emulated by controlling the energising of the electromagnet. An annular, surface-adjacent zone of axially-directed magnetisation is created whose external detectable field (40) has a distribution in the axial direction which shifts axially under applied torque. An axial or radial component may be sensed as a measure of torque. A method of preparing the shaft for magnetisation (magnetic-cleansing) and a post-magnetisation procedure is disclosed.
Inventors:
Mei Rats Accelerator
Application Number:
JP2001576421A
Publication Date:
October 21, 2003
Filing Date:
April 10, 2001
Export Citation:
Assignee:
Fast technology ag
International Classes:
G01L3/10; (IPC1-7): G01L3/10
Domestic Patent References:
| JPS59192930A | 1984-11-01 | |||
| JPS59184505A | 1984-10-19 | |||
| JPS61115312A | 1986-06-02 |
Foreign References:
| WO1999056099A1 | 1999-11-04 |
Attorney, Agent or Firm:
Toshiaki Ikeura