Rotodynamic machine for the forwarding of a fluid

Details Rotodynamic machine for the forwarding of a fluid Rotodynamic machine for the forwarding of a fluid

1998-04-03

2000-03-28

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

318722, 4174237, H02K 100

Patent

active

060435801

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a rotodynamic machine for the forwarding of a fluid, for example to a turbomachine or a centrifugal pump.
It is known to hold the shaft of a rotodynamic machine for the forwarding of a fluid, such as a turbomachine, in particular a turbo-compressor, in the radial direction using two magnetic bearings arranged in the region of the shaft end. Magnetic bearings have a limited specific bearing capacity which is lower than for conventional bearings. For reasons of space these magnetic bearings are designed to be very narrow in the longitudinal direction of the shaft in turbomachines and therefore possess a low journalling force.


SUMMARY OF THE INVENTION

It is an object of the present invention to journal and to drive the rotor of a rotodynamic machine in a technically and economically more advantageous manner.
The rotodynamic machine in accordance with the invention for the forwarding of a fluid, in particular a turbomachine or a centrifugal pump, comprises a journalled shaft with a rotor and a drive and bearing apparatus, with the drive and bearing apparatus comprising a stator with electrical windings surrounding the shaft, and with the mutual design of the rotor, the stator and the electrical windings and the excitation of the electrical windings by a control device being such that these form a bearing-free motor in order to both journal the shaft without contact and to produce a torque on the shaft through magnetically acting forces. The shaft and the rotor are preferably designed as a unit in such a manner that the rotor forms a part of the shaft, with the rotor being understood in the present specification to mean the rotatable part of the drive and bearing apparatus. The rotor cooperates with the stator in such a manner that the rotor is held in the stator without contact and at the same time can be driven by the stator. Since the rotor is connected firmly to the shaft or is a part of the shaft, the shaft is held and driven by the stator without contact.
A bearing-free motor is understood to mean an electrically excitable drive and bearing apparatus which comprises both a rotor and a stator having electromagnetic coils. The rotor, or the armature, of the bearing-free motor can be driven in accordance with the principles of electric machines in a manner which is known per se, that is, in accordance with the principles of a synchronous motor, of a reluctance motor or of an induction motor or an asynchronous motor respectively. The rotor of the bearing-free motor is held without contact by magnetically acting forces at least in one plane extending perpendicular to the axis of rotation. The electromagnetic coils can be excited in such a manner that the position of the rotor can be actively influenced in a plane extending perpendicular to the axis of rotation of the rotor. The position of the rotor is monitored by sensors and the electromagnetic coils are regulatably excited with a correspondingly designed excitation apparatus in such a manner that the rotor is held without contact in the stator with respect to the plane extending perpendicular to the axis of rotation of the rotor. In addition a torque can be produced on the rotor or the armature via a corresponding excitation of the electromagnetic coils of the stator so that the rotor experiences a rotation about its axial axis. The rotor of a so-called bearing-free motor of this kind is thus to be actively excited with respect to three degrees of freedom, namely the position in the x and y directions and the rotation about its axis. A bearing-free motor having these properties can be designed in accordance with different constructional forms.
A bearing-free motor can for example be designed as a reluctance motor in that the rotor, for example, is designed in the shape of a cross and the stator is formed of a plurality of coils which extend in the radial direction, are arranged in the peripheral direction about the rotor, and can be individually electrically excited. These coils can be excited in such

REFERENCES:
patent: 3224818 (1965-12-01), Sixsmith
patent: 3694041 (1972-09-01), Studer
patent: 3769555 (1973-10-01), Dolbachian et al.
patent: 4057369 (1977-11-01), Isenberg et al.
patent: 5112202 (1992-05-01), Oshima et al.
patent: 5237229 (1993-08-01), Ohishi
patent: 5424595 (1995-06-01), Preston
patent: 5578880 (1996-11-01), Lyons et al.

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