Anisotropic Bonded Magnet and Direct Current Motor Using the Same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
May 21, 2009
app pub date -
Aug 3, 2006
filing date -
Aug 8, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The rectifying characteristic of a brush-equipped direct current machine is improved, and the life of the machine is extended. As illustrated in FIG. 2, a magnetic flux density reduced portion in which the magnetic flux density is reduced is formed in a magnetic pole section of an anisotropic bonded magnet. The position in the magnetic pole section formed with the magnetic flux density reduced portion is formed at the position at which, when a rectifier coil moves in a rectification section, the absolute value of the density of a magnetic flux penetrating the rectifier coil is increased due to the influence of the magnetic flux density reduced portion. Thus, an inverse voltage can be induced in the rectifier coil in the direction of inversion current during a rectification period. It is therefore possible to facilitate the inversion of the current, and to compensate for inadequate rectification and improve the rectifying characteristic. Accordingly, the occurrence of sparks at the end of the rectification can be prevented.
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