DE102008004225A1 - Electric machine - Google Patents

Abstract

The invention relates to an electric machine with a rotor rotatably mounted about a rotation axis 2 and a rotor enclosing the rotor and one or more recesses 1 for receiving rectangular permanent magnets 4, 4 '. The permanent magnets 4, 4 'in the recess 1 by a plastic 12 completely or partially enclosed. A recess 1 has in the circumferential direction of the rotor side by side two receiving areas 5, 5 ', wherein in each receiving region 5, 5' a permanent magnet 4, 4 'is arranged and wherein the permanent magnets 4, 4' have the same polarization direction and by one or more spacers are held against each other at a distance from each other.

Description

The The invention relates to an electric machine having one around one Rotary axis rotatably mounted rotor and a rotor enclosing or Rotor enclosed stator and one or more recesses for receiving rectangular Permanent magnets, wherein the permanent magnets in the recess of a Plastic completely or partially enclosed.

at Such electrical machines, it is known every permanent magnet to arrange in a separate recess and by injecting plastic full surrounded with plastic and thus protect against corrosion.

task The invention is an electric machine of the aforementioned To create a kind that has a low-cost simple structure and easy to install.

These Task is inventively characterized solved, that a recess in the circumferential direction of the rotor or stator side by side has two recording areas, wherein in each recording area a Permanent magnet is arranged and wherein the permanent magnets have the same polarization direction and by one or more spacers touching each other are kept at a distance.

By this education is possible despite big Extension in the circumferential direction simple and inexpensive rectangular permanent magnets to use.

The Enclose the permanent magnets in the recesses with plastic does not lead only to a corrosion protection but at the same time to a positionally safe Fixing the permanent magnets in the recesses so that no Relative movement of the permanent magnets can occur in the recesses caused by the vibrations and centrifugal forces during operation could become.

there The plastic is in the recesses, the permanent magnets at least partially enclosing injected.

The the permanent magnets receiving recesses may be on the rotor or on the Stator be formed.

Preferably are the recesses closed recesses, which at their for Rotary axis of the rotor axial ends insertion openings for inserting the Have permanent magnets.

Thereby the centrifugal forces acting on the permanent magnets are safe supported.

Around a touch the two permanent magnets used in a recess safely avoid, can between the receiving areas of the permanent magnets Center spacers protrude into the recess, where the two Permanent magnets with one in the circumferential direction of the rotor or stator directed, facing each other end face in Appendix.

there there is a maximized utilization of the recess by the permanent magnets, if the center spacer, in particular by less than half of Radial thickness of the recess radially inwardly into the recess protrudes so that the center spacer radially from the outside in the V-shaped Gap protrudes between the permanent magnets. Radially inside remains a small but certainly sufficient gap between the permanent magnets.

to Positioning of the permanent magnets in the recess under at least largely avoiding a plant of the faces of the permanent magnets the walls directed in the circumferential direction can be facing away from one another Ends of the recording areas of the recess end spacer arranged be, at which the opposite end faces of the permanent magnets are in plant.

In simple education can while the center spacer and / or the Endabstandshalter like a cam be educated.

there preferably protrude the Endabstandshalter, in particular by less than half the radial thickness of the recess from the inside radially outward in the Recess.

Ragen while the Endabstandshalter free in the recesses, it is done a complete one Supplying the magnetic flux to the radially inner pole of the permanent magnet.

One complete Enclose including the end faces of the permanent magnets with plastic is possible in that the axial length the recess is larger as the axial length the permanent magnets and the axial ends of the permanent magnets of the Plastic are enclosed.

Preferably the rotor and / or the stator consists of several to a laminated core joined Sheet metal layers.

By an enclosure the end faces of the permanent magnets with plastic can on end plates of the Sheet metal packages are dispensed with.

It but it is also possible that the laminated core at one or both ends by end plates without Recess is closed.

to support the centrifugal forces can the permanent magnets on the radially outer wall be formed in the rotor recess in abutment.

Spacing agents and Endabstandshalter can be designed as separate components. Component-saving and easy to assemble but it is when the center spacers and / or the Endabstandshalter are formed integrally with the laminated core.

One embodiment The invention is illustrated in the drawing and will be described below described in more detail. Show it

1 a side view of a rotor ring of an electric machine

2 an enlarged section of the side view 1

3 an enlarged section along the line II-II in 1 ,

The illustrated in the figures annular rotor is as a laminated core 13 formed from assembled sheet metal layers and has sixteen axially continuous recesses distributed uniformly on its circumference 1 on, which are closed, and at their to the axis of rotation 2 of the rotor axial ends import openings 3 for inserting permanent magnets 4 . 4 ' exhibit.

Every recess 1 consists of two recording areas 5 . 5 ' each of which is a permanent magnet 4 . 4 ' receiving, with always the two in a recess 1 used permanent magnets 4 . 4 ' have the same radial polarization direction.

Each recording area 5 . 5 ' extends at right angles to a radial directed towards its center.

The permanent magnets 4 . 4 ' have a rectangular cross-section.

In the middle are the two recording areas 5 and 5 ' by a cam-like center spacer 6 separated from each other, the part of the laminated core 13 is and from radially outside radially inwardly into the recess 1 protrudes.

The extension of the center spacer 6 radially inward is about a quarter of the radial width of the recess 1 ,

At the circumferentially opposite ends of the recess 1 also project in one piece with the laminated core 13 formed cam-like Endabstandshalter 7 from radially inward to radially outward into the recess 1 into it.

The extension of the end spacers 7 radially outwardly is also about one quarter of the radial width of the recess 1 ,

The recess 1 extends in the circumferential direction over the Endabstandshalter 7 out so that the end spacers 7 are freeragend.

The radial thickness of the permanent magnets 4 . 4 ' and the reception areas 5 . 5 ' correspond to each other.

In the reception areas 5 . 5 ' used permanent magnet 4 . 4 ' The permanent magnets are based 4 . 4 ' in the circumferential direction with their facing end faces 8th . 8th' at the center spacer 7 and with their faces facing away from each other 9 . 9 ' at the end spacers 7 from.

The width of the center spacer 6 in the circumferential direction is just so large that the radially inner ends of the facing end faces 8th . 8th' the permanent magnets 4 . 4 ' certainly not touch.

The axial length of the laminated core 13 and thus also the recess 1 is greater than the axial length of the permanent magnets 4 . 4 ' so that when in the recesses 1 used in the long term 4 . 4 ' from the permanent magnets 4 . 4 ' to the side surfaces column 10 . 10 ' remain.

For mounting the permanent magnets 4 . 4 ' will be the Bleckpaket 13 vertical with its one end face on a slide 11 hung up and the recesses 1 with a certain amount of plastic grout 12 filled.

Subsequently, the permanent magnets 4 . 4 ' in the recesses 1 inserted so that on both sides of the column 10 . 10 ' remain.

This will make the plastic grout 12 through the gaps between the walls of the recesses 1 and the permanent magnet 4 . 4 ' pressed.

The specific amount of plastic grout 12 is dimensioned so that after reaching the mounting position by the permanent magnets 4 . 4 ' just the upper gap 10 filled and thus the upward side of the permanent magnets 4 . 4 ' from the plastic grout 12 is covered.

After curing of the plastic casting compound 12 all you need is the foil, which is only needed for mounting 11 be removed.

The permanent magnets 4 . 4 ' are then not only correctly positioned and fastened in the recess 1 arranged, but also completely enclosed by the plastic and thus against external influences such. B. corrosion protected.

1

recesses

2

axis of rotation

3

in openings

4

permanent magnets

4 '

permanent magnets

5

receiving areas

5 '

receiving areas

6

Spacing agents

7

end spacers

8th

facing front sides

8th'

facing front sides

9

facing away front sides

9 '

facing away front sides

10

column

10 '

column

11

foil

12

Kunststoffvergussmasse

13

laminated core

Claims (14)

Electric machine having a rotor rotatably mounted about an axis of rotation and a rotor enclosing the rotor or enclosed by the rotor and one or more recesses for receiving rectangular permanent magnets, wherein the permanent magnets are completely or partially enclosed in the receptacle of a plastic, characterized in that a recess ( 1 ) in the circumferential direction of the rotor or stator side by side two receiving areas ( 5 . 5 ' ), wherein in each receiving area ( 5 . 5 ' ) a permanent magnet ( 4 . 4 ' ) and wherein the permanent magnets ( 4 . 4 ' ) have the same polarization direction and are held by one or more spacers against each other touching each other at a distance. Electrical machine according to claim 1, characterized in that the recesses ( 1 ) are formed on the rotor or on the stator. Electrical machine according to one of the preceding claims, characterized in that the recesses ( 1 ) closed recesses ( 1 ) are at their to the axis of rotation ( 2 ) of the rotor axial ends import openings ( 3 ) for introducing the permanent magnets ( 4 . 4 ' ) exhibit. Electrical machine according to one of the preceding claims, characterized in that between the receiving areas ( 5 . 5 ' ) of the permanent magnets ( 4 . 4 ' ) a middle spacer ( 6 ) in the recess ( 1 ) protrudes, on which the two permanent magnets ( 4 . 4 ' ) with a directed in the circumferential direction of the rotor or stator, facing each other end face ( 8th . 8th' ) is in plant. Electrical machine according to claim 4, characterized in that the middle spacer ( 6 ), in particular by less than half the radial thickness of the recess ( 1 ) radially inwardly into the recess ( 1 protrudes. Electrical machine according to one of the preceding claims, characterized in that at the opposite ends of the receiving areas ( 5 . 5 ' ) of the recess ( 1 ) End spacers ( 7 ) are arranged, on which the opposite end faces ( 9 . 9 ' ) of the permanent magnets ( 4 . 4 ' ) are in plant. Electrical machine according to one of claims 4 to 6, characterized in that the middle spacer ( 6 ) and / or the end spacers ( 7 ) are formed like a cam. Electrical machine according to one of claims 6 and 7, characterized in that the end spacers ( 7 ), in particular by less than half the radial thickness of the recess ( 1 ) from the inside radially outward into the recess ( 1 ) protrude. Electrical machine according to claim 8, characterized in that the end spacers ( 7 ) freely in the recesses ( 1 ) protrude. Electrical machine according to one of the preceding claims, characterized in that the axial length of the recess ( 1 ) is greater than the axial length of the permanent magnets ( 4 . 4 ' ) and the axial ends of the permanent magnets ( 4 . 4 ' ) are enclosed by the plastic. Electrical machine according to one of the preceding claims, characterized in that the rotor and / or the stator of several to a laminated core ( 13 ) composed sheet metal layers. Electrical machine according to claim 11, characterized in that that the laminated core at one or both ends by end plates without Recess is closed. Electrical machine according to one of the preceding claims, characterized in that the permanent magnets ( 4 . 4 ' ) at the radially outer Wall of the recess formed in the rotor ( 1 ) is in plant. Electrical machine according to one of claims 4 to 13, characterized in that the middle spacers ( 6 ) and / or the end spacers ( 7 ) in one piece with the laminated core ( 13 ) are formed.