End plate for an electric machine, electric machine and method for assembling an electric machine

Patent metadata

Field	Value
Publication number	US-9859769-B2
Application number	US-201314404264-A
Country	US
Kind code	B2
Filing date	May 28, 2013
Priority date	May 31, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

An end plate for an electric machine includes: a bearing receptacle in which a magnetic bearing which is configured for rotatably mounting a rotor of the electric machine can be accommodated; and a radially outwardly pointing circumferential contour on which a number of at least three supporting elements are provided, which supporting elements each protrude radially beyond the circumferential contour by a determined protruding amount, with the result that the supporting elements define a discontinuous external circumferential contour of the end plate. The respective protruding amounts of the support elements are dimensioned such that the end plate can be fitted in by making a center of the magnetic bearing correspond to at least one of a geometric longitudinal axis of the electric machine and a magnetic longitudinal axis of the electric machine.

First claim

The invention claimed is:

1. An end plate ( 30 ) for an electric machine ( 1 ), the end plate comprising:
a magnetic bearing ( 80 ) configured to rotatably mount a rotor ( 20 ) of the electric machine ( 1 );
a bearing receptacle ( 40 ), configured to accommodate the magnetic bearing ( 80 ) therewithin; and
a radially outer circumferential contour ( 50 ), on which at least three support elements ( 60 , 70 ) are provided, each of which protrudes radially outside, with respect to the circumferential contour ( 50 ), by a protruding amount (M) so as to define a discontinuous outer circumferential contour of the end plate ( 30 ), the at least three support elements ( 60 , 70 ) being detachably fastened to the end plate ( 30 ) by fasteners ( 63 , 73 ), the fasteners ( 63 , 73 ) being arranged so as to be circumferentially orientated along the circumferential contour of the end plate ( 30 ),
wherein the respective protruding amounts (M) of the at least three support elements ( 60 , 70 ) are dimensioned so that the end plate ( 30 ) is fitted in by making a center of the magnetic bearing ( 80 ) coincide with at least one of a geometrical longitudinal axis (A 2 ) of the electric machine ( 1 ) and a magnetic longitudinal axis (A 4 ) of the electric machine ( 1 ),
wherein the electric machine ( 1 ) comprises a stator ( 10 ) having a stator housing ( 11 ) having an inner circumference ( 12 ), and wherein the support elements ( 60 , 70 ) are arranged in two groups of support elements distributed about the circumferential contour ( 50 ), wherein the support elements of a first group of the two groups are in engagement with the inner circumference ( 12 ) of the stator housing ( 11 ) so as to fit in the end plate ( 30 ) with respect to the stator housing ( 11 ), and wherein the support elements of a second group of the two groups are in engagement with an inner circumference ( 101 ) of a connecting housing ( 100 ) so as to fit in the connecting housing ( 100 ) with respect to the stator housing ( 11 ) independently of the end plate ( 30 ), and
wherein the support elements ( 60 , 70 ) each have a support surface ( 61 a , 71 a ) located radially at the outermost side of the respective support elements, which are formed stepped axially of the end plate ( 30 ), wherein the stepping of the first group with at least three support elements ( 60 ) radially rises in a first axial direction (AR 1 ), perpendicular to the circumferential orientation of the fasteners ( 63 ) for the first group, as far as to the respective protruding amount (M) and the stepping of the second group with at least three support elements ( 70 ) radially rises in a second axial direction (AR 2 ), perpendicular to the circumferential orientation of the fasteners ( 73 ) for the second group, as far as to the respective protruding amount (M), and wherein within each of the two groups the support elements ( 60 , 70 ) are arranged with a defined angular spacing from one another distributed about the circumferential contour ( 50 ).

2. The end plate ( 30 ) according to claim 1 , wherein the support elements ( 60 , 70 ) are each mounted radially adjustably on the circumferential contour ( 50 ) so that the respective protruding amounts (M) of the support elements ( 60 , 70 ) are adjustable.

3. The end plate ( 30 ) according to claim 1 , wherein each support element ( 60 , 70 ) comprises: a contact body ( 61 , 71 ) located radially to the outside and configured to contact an inner circumference ( 12 ) of the stator housing ( 11 ), and an individual number of shims ( 62 , 72 ) shimmed under the contact body ( 61 , 71 ) radially to the inside, each shim ( 62 , 72 ) having a specific radial thickness dimension.

4. The end plate ( 30 ) according to claim 1 , further comprising respective recesses ( 51 ), each of which extends from the circumferential contour ( 50 ) radially to the inside and circumferentially of the end plate ( 30 ), wherein the support elements ( 60 , 70 ) are arranged in the respective recesses ( 51 ).

5. The end plate ( 30 ) according to claim 1 , wherein within each of the two groups the support elements ( 60 , 70 ) are configured so as to be symmetrically distributed about the circumferential contour ( 50 ).

6. An electric machine ( 1 ) comprising:
a stator ( 10 ) having a stator housing ( 11 );
a rotor ( 20 ) arranged in an inner circumference ( 12 ) of the stator housing ( 11 ); and
an end plate ( 30 ) according to claim 1 ,
wherein for rotatably mounting the rotor ( 20 ), the magnetic bearing ( 80 ) is received in the bearing receptacle ( 40 ) of the end plate ( 30 ), and for radially supporting the end plate ( 30 ) the outer circumferential contour is fitted into the inner circumference ( 12 ) of the stator housing ( 11 ) such that the center of the magnetic bearing ( 80 ) is fitted in with at least one of a geometrical longitudinal axis (A 2 ) of the electric machine ( 1 ) and a magnetic longitudinal axis (A 4 ) of the electric machine ( 1 ).

7. The electric machine ( 1 ) according to claim 6 , wherein the rotor ( 20 ) comprises a rotor shaft ( 21 ), and wherein the magnetic bearing ( 80 ) has an active magnetic bearing with a catch bearing, having an inner ring, which encloses the rotor shaft ( 21 ) and which has an inner diameter that is greater by a predetermined dimension than an outer diameter of the rotor shaft ( 21 ), so that in the case of an energized magnetic bearing ( 80 ) an annular gap between the rotor shaft ( 21 ) and the inner ring of the catch bearing is formed and in the case of a non-energized magnetic bearing ( 80 ) the rotor shaft ( 21 ) rests on an inside of the inner ring.

8. The electric machine ( 1 ) according to claim 7 , further comprising a control device ( 90 ) configured to electrically activate the magnetic bearing ( 80 ), so that in the case of an energized magnetic bearing ( 80 ) an axis of rotation of the rotor shaft ( 21 ) coincides with the center (A 1 ) of the magnetic bearing.

9. A method for assembling an electric machine ( 1 ) according to claim 7 , the method comprising:
inserting the rotor ( 20 ) in the stator housing ( 11 );
fitting the outer circumferential contour of the end plate ( 30 ) into the inner circumference ( 12 ) of the stator housing ( 11 ), so that the magnetic bearing ( 80 ) and the inner ring of the catch bearing enclose the rotor shaft ( 21 );
operating the electric machine ( 1 ) so that its rotor ( 20 ) with an energized magnetic bearing ( 80 ) rotates;
determining a vibration behavior of the rotor ( 20 );
determining a correction offset from the vibration behavior; and
changing the respective protruding amounts (M) of the support elements ( 60 , 70 ) based on the correction offset.

Assignees

• Kabs Gino
• Kleynhans George
• Dettwyler Markus
• Vetter Marcel
• Man Diesel & Turbo Se

Inventors

• Kabs Gino
• Kleynhans George
• Dettwyler Markus
• Vetter Marcel

Classifications

• H02K5/161

  radially supporting the rotary shaft at both ends of the rotor (H02K5/165, H02K5/167, H02K5/173 take precedence) · CPC title

• H02K5/15

  Mounting arrangements for bearing-shields or end plates · CPC title

• H02K7/09 Primary

  with magnetic bearings · CPC title

• H02K2213/09

  Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators · CPC title

• F16C23/00

  Bearings for exclusively rotary movement adjustable for aligning or positioning (F16C27/00 takes precedence {; hydrostatic bearings F16C32/067}) · CPC title