Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
1998-10-20
2001-11-06
Arbes, Carl J. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S598000, C029S592100, C310S261100, C310S263000, C310S156030
Reexamination Certificate
active
06311383
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application No. Hei 9-289638 filed on Oct. 22, 1997, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electric-machine-rotor and a method of manufacturing such a rotor.
2. Description of the Related Art
In a rotor having a field coil and no auxiliary permanent magnets, a difference in the magnetic polarity of the claw poles does not cause any problem due to change in the winding direction of the field coil, the position of wire-ends thereof extending from a bobbin, or connection of the wire-ends and slip rings.
As disclosed in JP-A-7-123644, there is a rotor that has auxiliary permanent magnets between claw poles of a pair of pole cores to increase effective magnetic flux and output power. It is necessary for this kind of rotor that the permanent magnets polarize the claw poles in the same polarity as the field coil does when it is energized. Otherwise, sufficient output power can not be generated.
SUMMARY OF THE INVENTION
The present invention is to provide an improved electric-machine-rotor having a field coil and auxiliary permanent magnets that can provide proper magnetic polarity to assure sufficient output power and a method of manufacturing such a rotor.
According to a main feature of the invention, an electric-machine rotor comprising a field coil, a pair of pole cores each having a plurality of claw poles extending alternately from one pole core to the other, a plurality of auxiliary permanent magnets disposed between the claw poles, a pair of slip rings connected to the field coil, and means for indicating proper polarity of the claw poles to be magnetized. Therefore, the permanent magnets can be magnetized properly and easily according to the indication.
The means may be a pair of wire-ends extending from the field coil differently from each other.
According to another feature of the invention, an improved method of manufacturing is applied to an electric-machine rotor composed of a field coil, a pair of pole cores having a plurality of claw poles extending alternately from one pole core to the other, a plurality of auxiliary permanent magnets disposed between the claw poles, and a pair of slip rings connected to the field coil. The method is composed of the steps of forming a pattern on the pole cores to indicate proper polarity of the claw poles and magnetizing the plurality of permanent magnets according to the pattern.
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Irie Hitoshi
Umeda Atsushi
Arbes Carl J.
Denso Corporation
Pillsbury & Winthrop LLP
Trinh Minh
LandOfFree
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