Recessed alternator pole piece

Details Recessed alternator pole piece Recessed alternator pole piece

2000-05-05

2001-10-23

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S049540

Reexamination Certificate

active

06307297

ABSTRACT:

TECHNICAL FIELD
The present invention relates to improved rotor members for alternator mechanisms.
BACKGROUND
Conventional alternators for vehicles include stator members and rotor members, together with rectifiers and other components, all mounted in a housing. The stator member is fixedly mounted in the housing member and the rotor member is rotatably mounted on a shaft inside the stator. One or more bearing members are used to facilitate rotation of the rotor.
Rotor members with claw pole designs have two pole pieces have claw fingers positioned around a rotor coil. The claw fingers of the two pole pieces are interleaved together in the rotor member and permanent magnets are positioned on, between, or adjacent the claw fingers and secured thereto. The rotor field coil comprises a wire winding on a bobbin.
The magnets in the rotor members are positioned to provide additional magnetic field sources that aid the field coil and prevent flux leakage between the claw fingers. The overall length of the alternator can be a primary consideration in the design and development relative to the particular vehicle and vehicle engine space requirements. In reducing the axial length of an alternator, however, sacrifices typically need to be made in the length of the rotor coil or in the stiffness of the claw fingers. Shortening the rotor coil can reduce the power output of the alternator, however, and lengthening the claw fingers may allow them to flex outwardly during high speed rotation and make undesirable contact with the stator member.
Thus, it is desirable to provide an alternator rotor member which does not reduce the power output of the alternator, or result in claw fingers which could contact the stator during rotation.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved alternator mechanism. It is also an object of the present invention to provide an improved rotor member for an alternator mechanism.
It is a further object of the present invention to provide an improved rotor member for an alternator mechanism which has a reduced axial length. It is a still further object of the present invention to provide an improved rotor member for an alternator which has a-shortened axial length and does not have a reduced power output or significant length of unsupported claw fingers without sufficient stiffness to prevent outward deflection during rotation.
These and other objects, purposes, and advantages of the invention are provided by the following invention, which is described below and further disclosed and described in the attached drawings and appended claims.
In accordance with the present invention, a rotor member for a vehicle alternator mechanism is provided which has a shortened axial length without a reduced power output or stiffness of the claw fingers. Each of the pole pieces minimizes the unsupported length of the claw fingers and still allows the claw members to have sufficient length to allow the alternator mechanism to provide the necessary power output. An annular channel or recess is provided in the back iron of the pole pieces in order to allow a wider coil than what would normally be utilized. A ridge or ring of metal material surrounding the channel provides support for the claw fingers and enhanced high speed rotational capability.
The present invention also provides a large surface area on the pole piece, below the magnets to provide sufficient metal for the flux from the magnets and allow relatively large magnets to be used in the design. Additionally, the close proximity of the inside diameter of the channel with the outside diameter of the field coil provides for a heat transfer surface in which the heat generated by the field coil can transfer to the cooler pole piece.
Further features and details of the invention are disclosed below in the accompanying description, attached drawings, and appended claims.


REFERENCES:
patent: 2950401 (1960-08-01), Evans
patent: 4614889 (1986-09-01), Ikegami et al.
patent: 5132581 (1992-07-01), Kusase
patent: 5325003 (1994-06-01), Saval et al.
patent: 5329199 (1994-07-01), Yockey et al.
patent: 5361011 (1994-11-01), York
patent: 5382862 (1995-01-01), Ward et al.
patent: 5796201 (1998-08-01), Kamitani
patent: 5828155 (1998-10-01), Adachi et al.

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