Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-11-12
2001-05-22
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C318S611000, C318S716000, C318S717000
Reexamination Certificate
active
06236130
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method and to an arrangement for the excitation of the journalling winding and the drive winding systems in magnetically journalled electrical machines for the purpose of the impressing of angle independent forces and torques and to a corresponding electrical drive.
Magnetic journalling technology opens up fields of application in the construction of machines and apparatuses with extremely high demands on the speed of rotation range, the lifetime, the purity and the imperviousness of the drive system—thus substantially fields of application which cannot or can only with difficulty be realized using conventional journalling techniques. Various embodiments, such as for example high speed milling and grinding spindles, turbocompressors, vacuum pumps, or pumps for highly pure chemical or medical products are already being equipped with magnetic bearings.
A conventional magnetically journalled machine (
FIG. 1
) requires, in addition to a machine unit
1
, two radial magnetic bearings
2
and
3
, an axial magnetic bearing
4
, two mechanical intercept bearings
5
and
6
, as well as a total of ten power controllers
7
,
8
,
9
and
10
for the excitation of the motor and magnetic journalling loops. There are suggestions in the literature (
FIG. 2
) for integrating machines and radial magnetic bearings in a magnetic stator unit. Two separate winding systems
11
and
12
for drive and journalling force windings are introduced in multiple layers into grooves in a stator. Both winding systems have three loops and differ by one in the number of pole pairs. The coils are wound with fractional pitch and distributed over a plurality of grooves, through which an approximately sinusoidal flux linkage is achieved:
4
-pole drive winding
11
(outer): first loop
13
, second loop
14
, third loop
15
two-pole bearing winding
12
(inner): first loop
16
, second loop
17
, third loop
18
The machine cross-sections illustrated in the figures are by way of example and are partly highly simplified and serve exclusively for the more precise explanation of the principle of operation.
Previously realized excitation concepts require sinusoidally distributed air gap flux densities and sinusoidal armature current layers. Distributed winding systems are thereby required (FIG.
2
).
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method and an arrangement which is as uncomplicated and inexpensive as possible for the excitation of the journalling winding and drive winding systems of electrical machines with magnetic journalling in order to be able to impress a predetermined journalling force and torque behavior.
REFERENCES:
patent: 3650581 (1972-03-01), Boden et al.
patent: 3845997 (1974-11-01), Boden et al.
patent: 4841204 (1989-06-01), Studer
patent: 5084643 (1992-01-01), Chen
patent: 5130589 (1992-07-01), Kanemitsu
patent: 5202824 (1993-04-01), Chen
patent: 5471106 (1995-11-01), Curtis et al.
patent: 5625240 (1997-04-01), Bernus
patent: 5666014 (1997-09-01), Chen
patent: 5821656 (1998-10-01), Colby et al.
patent: 5834867 (1998-11-01), Kikuchi et al.
patent: 5925957 (1972-03-01), Chapman
patent: 0739078A2 (1996-10-01), None
patent: 2239038 (1975-02-01), None
patent: WO 95/18925 (1995-07-01), None
Amrhein Wolfgang
Silber Siegfried
Mullins Burton
Sulzer Electronics AG
Townsend and Townsend / and Crew LLP
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