Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-09-17
2001-03-06
Waks, Joseph (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C029S598000
Reexamination Certificate
active
06198194
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an electrical machine and, more particularly, to a segmented rotor for a variable reluctance electric machine.
BACKGROUND OF THE INVENTION
One type of variable reluctance motor utilizes a rotor formed of axially spaced apart disks that are rotatable relative to a stator portion. The stator portion is stationary and also formed of disks located intermediate adjacent pairs of the rotor disks. A stator winding circumscribes each stator pole pair and, when energized, directs an electromagnetic field axially through a magnetic circuit formed of the energized stator pole pair and adjacent rotor poles. Torque is generated when a pair of rotor poles move toward a position of axial alignment relative to an adjacent energized stator pole pair to minimize the reluctance. Examples of this type of variable reluctance motor are disclosed in U.S. Pat. No. 3,700,944 to Heintz and U.S. Pat. No. 3,992,641 to Heinrich et al.
Another type of variable reluctance motor is formed of an elongated rotor mounted coaxially within an elongated annular stationary stator. Each of the rotor and stator has a plurality of radially protruding poles or teeth that extend axially. An annular air gap separates the rotor poles from the stator poles. The stator generates an electromagnetic field when a stator winding associated with a pair of opposed stator poles is energized. The electromagnetic field is directed radially with respect to a central axis extending longitudinally through the rotor and the stator. The electromagnetic field urges a pair of opposed rotor poles into radial alignment with the stator poles being energized to minimize the reluctance of the corresponding magnetic circuit formed by the energized stator poles and adjacent rotor poles. The movement of the rotor, in turn, generates torque. Examples of this type of variable reluctance machine are disclosed in U.S. Pat. No. 4,670,696 to Byrne et al. and U.S. Pat. No. 5,747,912 to Sakuma et al.
SUMMARY OF THE INVENTION
The present invention is directed to a rotor for an electric machine that includes a first elongated rotor segment having a plurality of axially extending rotor poles arranged in a circular array about a central axis that extends longitudinally through the rotor. A second rotor segment, which engages the first rotor segment, has a plurality of axially extending rotor poles arranged in a circular array about the central axis. The poles of the second rotor segment are rotated in a first direction about the central axis relative to the poles of the first rotor segment. The rotor also includes a third rotor segment that engages at least one of the first and second rotor segments. The third rotor segment has a plurality of axially extending rotor poles arranged in a circular array about the central axis. The poles of the third rotor segment are rotated in a second direction about the central axis relative to the poles of the first rotor segment.
REFERENCES:
patent: 3171049 (1965-02-01), Jarrett
patent: 3700944 (1972-10-01), Heintz
patent: 3959672 (1976-05-01), Walker et al.
patent: 3992641 (1976-11-01), Heinrich et al.
patent: 4536672 (1985-08-01), Kanayama et al.
patent: 4626719 (1986-12-01), Foster
patent: 4670696 (1987-06-01), Byrner et al.
patent: 4902923 (1990-02-01), Okauchi
patent: 4920292 (1990-04-01), Albrecht et al.
patent: 4959578 (1990-09-01), Varga
patent: 5245238 (1993-09-01), Lynch et al.
patent: 5485046 (1996-01-01), Kaplan et al.
patent: 5619087 (1997-04-01), Sakai
patent: 5679995 (1997-10-01), Nagate et al.
patent: 5729065 (1998-03-01), Fremery et al.
patent: 5739612 (1998-04-01), Davenport
patent: 5747912 (1998-05-01), Sakuma et al.
patent: 5763976 (1998-06-01), Huard
Tarolli, Sundheim, Covell Tummino & Szabo L.L.P.
TRW Inc.
Waks Joseph
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