DE102013020461A1 - Rotor for electromechanical machine - Google Patents

Abstract

A rotor (1) for an electromechanical machine (62) is named, which is designed to rotate about an axis (5) with respect to a stator (60), comprising a rotor frame (2), and permanent magnets (4), the permanent magnets (4) are placed in pockets, which are arranged in the azimuthal direction in the rotor frame (2), the permanent magnets (4) being magnetized in the azimuthal direction, and two adjacent permanent magnets (4) each with the same pole facing each other. It is provided here that the permanent magnets (4) protrude (6) in the axial direction over the rotor frame and / or that a number of permanent magnets (4) each have a cross-section which is orthogonal to the axis (5) and which, deviating from a rectangular shape, is at least partially trapezoidal is. An electromechanical machine (62) is also specified, which comprises a stator (60) and such a rotor (1).

Description

The invention relates to a rotor for an electromechanical machine, which is designed for rotation about an axis with respect to a stator, comprising a rotor frame and permanent magnets, wherein the permanent magnets in pockets, which are arranged in the azimuthal direction in the rotor frame, are introduced, wherein the permanent magnets in azimuthal direction are magnetized, and wherein each two adjacent permanent magnets, each with the same pole face each other. The invention further relates to an electromechanical machine with such a rotor.

In one possible mode of operation for an electromechanical machine, for example for an electric motor, a cylindrical rotor with spoke-like permanent magnets is driven by an electromechanical field generated at a stator. Here, the rotor and a part of the stator on a rotational symmetry with respect to the axis of rotation, with respect to which the rotor, radially surrounded by the stator, is rotatably mounted. The rotor comprises a rotor frame, which is usually made of an axially stacked laminated core. The usually cuboid permanent magnets are usually used with a magnetization in the azimuthal direction in axially continuous, spoke-like circumferential recesses in the rotor frame. Here, two adjacent permanent magnets are each magnetized opposite. In the circumferential direction, therefore, in each case the same magnetic poles of each two magnets facing each other, which forms a rotor pole corresponding polarity in a circular sector of the rotor frame between two permanent magnets.

On the side of the stator facing the rotor, a number of electromechanical poles are arranged rotationally symmetrically with respect to the axis of rotation of the rotor. A pole here usually comprises a radially oriented soft iron core, around which a defined number of coil turns of conductor wire is wound, and a radially rotor facing the soft magnetic pole piece, which can be fixedly joined to the soft iron core or made in one piece. The pole pieces are each separated from the rotor by a thin air gap. The individual stator magnets can be electronically controlled or commutated by a power supply. In a corresponding driving a stator magnet is generated by the current flow of the coil winding in the soft iron core and thus in the pole piece, a magnetic flux whose field lines are at least partially aligned radially.

The magnetic flux generated by a driven stator magnet in the region of the rotor interacts with the magnetic flux of the individual rotor poles generated by the permanent magnets; This is called a flux linkage. The drive of the rotor via a suitable frequency with respect to the change in the polarity of the stator magnet and thus their respective attractive or repulsive interaction with the voltage applied to the pole shoes rotor poles, the flux linkage, in particular over the pole pieces and the rotor separating air gap away, an important Target for the efficiency and performance of the electric motor is. If the maximum torque, the maximum rotational frequency or the maximum power of an electric motor is to be increased, an increase in the magnetic flux linkage, ie the effective magnetic flux, is necessary.

The possible dimensions of an electromechanical machine are usually limited by a higher-level device in which the electromechanical machine is used. For example, the radius of the rotor can often be assumed to be unchangeable size for reasons of structural compactness. A possible axial extension of the rotor and the pole pieces has the disadvantage, with a constant number of turns of the coil windings each to extend the current-carrying conductor wire, whereby the ohmic resistance of the individual coil turns increases, resulting in power losses. Moreover, a higher ohmic resistance in the flow of current releases more heat, which is transmitted to the respective soft iron core and thereby adversely affects its magnetic properties. A possible increase in the number of turns of the individual coil turns at the same axial length of the pole pieces is due to the extension of the respective conductor wire and the concomitant increase in the ohmic resistance as it were. In addition, with increasing number of turns, the inductance of the coil increases, which can lead to an adverse mutual induction.

Furthermore, for the most efficient operation of the electromechanical machine, it is advantageous to minimize the magnetic losses which occur due to the short circuit of the magnetic field over parts of the rotor frame, in particular over the region remote from the stator near a lateral surface. The magnetic flux of field lines, which connect the two opposite poles of a magnet together, can not contribute to the flux linkage between the rotor field and the stator field due to the field closure; These losses should be limited as far as possible.

The invention has for its object to provide a rotor for an electromechanical machine, which provides the highest possible effective magnetic flux available. Further, the invention has for its object to provide an advantageous application for such a rotor.

The former object is for a rotor for an electromechanical machine, which is designed for rotation about an axis with respect to a stator, comprising a rotor frame and permanent magnets, wherein the permanent magnets in pockets which are arranged in the azimuthal direction in the rotor frame, are introduced Permanent magnets are magnetized in the azimuthal direction, and wherein each two adjacent permanent magnets, each with the same pole face each other, according to the invention achieved in that the permanent magnets protrude in the axial direction over the rotor frame.

At the stator of the electromechanical machine in this case a number of stator poles is provided, wherein a stator pole may be formed as a pole of an electromagnet or as a pole of an electric induction generator. A stator pole expediently comprises a pole shoe, which faces the rotor in the radial direction.

In a first step, the invention proceeds from the fact that the magnetic flux density at a sufficiently smooth surface of a permanent magnet, which is approximately perpendicular to the azimuthal direction and thus to the magnetization, as substantially, d. h., Up to negligible edge effects, regardless of the axial length of the permanent magnet is to be assumed, since the permanent magnets can be assumed to be magnetized within the reasonable possibilities as to saturation. In this case, a sufficiently smooth surface should be understood as meaning, in particular, an edge-free and uniformly either convex or concave or flat surface and approximately perpendicular to the azimuthal direction such that the greatest contribution of the surface normals in the azimuthal direction takes place at each point of the surface. An axial extension of a permanent magnet increases compared to an axially flush with the rotor frame final permanent magnet to the direction of the magnetization approximately perpendicular surface. Thus, by an axial projection of the permanent magnets due to the uniform flux density at the surfaces of the permanent magnets in the axial direction (with possible variation of the flux density in the radial direction, which is not relevant), the magnetic flux is amplified. This creates, apart from the permanent magnets themselves, no additional material. The additional axial space requirement for an axial projection is to be set in the low two-digit percentage range based on the axial length of the rotor frame and thus does not represent a decisive obstacle to a compact design.

In a further step, the invention recognizes that due to the high reluctance of the air surrounding the rotor for the magnetic field, which is generated by the axially projecting portions of the permanent magnets, the termination of the field lines on the rotor frame and components of the stator, which in the vicinity of Rotors are arranged, is searched. In particular, in a rotor frame made of easily magnetizable material, it is energetically unfavorable at an axially projecting portion of a permanent magnet to close the field lines from one azimuthal side to the opposite pole magnetized other side over the surrounding air, since the reluctance there is higher by several orders of magnitude than in the rotor frame , In this case, the rotor frame is preferably made of ferromagnetic material, in particular of soft magnetic material.

In the rotor frame, in particular in the case of a rotor frame of easily magnetizable material, rotor poles each having the same polarity of the magnetization of the mutually facing surfaces of each two adjacent permanent magnets, which bound such a rotor pole in the circumferential direction, form in the circular ring sectors between the individual permanent magnets. A described amplification of the magnetic flux in the rotor by the axial projection of two adjacent permanent magnets thus leads to an amplification of the magnetic flux in the corresponding rotor pole. This flux, which is amplified in comparison to axially flush permanent magnets, leads in the region of the rotor pole to an increased magnetic flux density at a lateral surface of the rotor frame facing the stator poles.

If the electromechanical machine is operated as a motor, and correspondingly a stator pole as an electromagnet with approximately radially directed field lines at the radial boundary surface of the stator pole, an axial projection of the permanent magnets results due to the increased flux density at the stator-side lateral surface of the rotor frame in otherwise constant parameters Area of the rotor poles to an increased effective flux between a rotor and a stator pole or for improved Flußverkettung. Likewise, in a generator operation of the electromechanical machine by the increased flux density at a rotor pole, an electrical induction generator of the stator is penetrated by a stronger magnetic flux, which leads to a higher induction voltage.

In a third step, it is recognized that in case of a possible short circuit of the field of a permanent magnet over parts of the rotor frame, the rotor frame is easier to magnetically saturate due to the resulting from the axial projection of the permanent magnets increased flow than without axial projection. As a result, possible efficiency losses of the electromechanical machine are reduced.

In an advantageous embodiment, a soft magnetic material is attached to the axial boundary surfaces of the rotor frame between the axially projecting permanent magnets. The material for the rotor frame is often more expensive than a soft magnetic material, so that a filling of the axial supernatant with soft magnetic material can lead to an overall reduction in production costs.

Alternatively, the first object is for a rotor for an electromechanical machine, which is designed for rotation about an axis with respect to a stator, comprising a rotor frame and permanent magnets, wherein the permanent magnets in pockets, which are arranged in the azimuthal direction in the rotor frame, are introduced the permanent magnets are magnetized in the azimuthal direction, and wherein each two adjacent permanent magnets, each with the same pole face each other, according to the invention achieved in that a number of permanent magnets each having an orthogonal to the axis cross-section, which is at least partially trapezoidal deviating from a rectangular shape.

In this case, it is assumed in a first step that, in particular for a substantially annular rotor, with rectangular-shaped permanent magnets, the edge length on the radially inner side represents a limiting factor for constructional reasons. Since the permanent magnets can be considered to be largely magnetized to saturation, a trapezoidal broadening of a permanent magnet radially outward at a constant magnetization due to the larger volume leads to a larger magnetic moment in the azimuthal direction. If the electromechanical machine is operated as a motor, and correspondingly a stator pole as an electromagnet with field lines oriented approximately radially at the radial boundary surface of the stator pole, a trapezoidal azimuthal widening of the permanent magnets due to the thereby increased magnetic moment in the azimuthal direction leads, with otherwise constant parameters an increased torque around the axis of rotation.

In a second step, the invention recognizes that a sectional trapezoidal shape, in particular a trapezoidal taper on the radially outer end of a permanent magnet, simplifies the mounting of the permanent magnet, as a result of a taper at the radially outer end of a pocket for a permanent magnet in the rotor frame without additional retaining lugs to the radial fuse gets along, but can take on a permanent magnet by positive engagement occurring during rotation of the rotor centrifugal forces. The saving of further components for the radial securing of the permanent magnets enables a simpler and less expensive production of the rotor frame.

Based on a desired magnetic moment of the permanent magnets as a fixed design parameter is also determined in a third step, since the permanent magnets can be assumed to be magnetized to saturation, a radially outwardly widened or radially inwardly tapered trapezoidal shape of the permanent magnets compared to a Rectangular shape has a shorter edge length at the radially inner end result, and generally azimuthally has less space in the region of the radially inner end of the rotor frame. This widened, compared to a rectangular shape, the circular ring sector between two permanent magnets in this area, which additionally opens the option to use the space gained for a further structural change of the rotor frame in this area, which shorted the field of a permanent magnet on the rotor frame in this area should suppress.

Of course, the initially stated object is achieved by a combination of the aforementioned inventive solutions. Accordingly, it is provided in another solution according to the invention that the permanent magnets project in the axial direction over the rotor frame, and that a number of permanent magnets each have an orthogonal to the axis cross-section, which is at least partially trapezoidal deviating from a rectangular shape.

Preferably, the rotor frame is made of a stacked in the axial direction laminated core. This suppresses the formation of eddy currents in axial-radial planes during a rotation of the rotor, which can in turn affect the performance of the electromechanical machine by induced magnetic fields. For this purpose, the individual layers of the laminated core are electrically isolated from each other, for example by a paint.

Conveniently, sintered ferrite magnets and / or plastic-bonded permanent magnets are used as permanent magnets. Such magnets have with respect to the cost of a relatively high magnetization, which has a favorable effect on the production costs.

In an advantageous embodiment, an edge of at least one permanent magnet is chamfered. In this way, the holder of the permanent magnet can be simplified in the rotor frame by a part of the rotor frame or a fixedly joined to the rotor frame material fills the chamfer complementary.

Conveniently, the permanent magnets are pressed into the rotor frame and / or cast. This leads to a simple and fast production process.

In a further advantageous embodiment, at least one axially projecting beyond the rotor frame permanent magnet on at least one of its axially projecting side surfaces of a axially projecting from an axial end plate of the laminated core bending. The fold exerts a force on the at least one permanent magnet on the side surface and thereby helps to keep it in its position. This is preferably a side surface of the at least one permanent magnet, which is approximately perpendicular to the azimuthal direction. In particular, the at least one permanent magnet can abut against a further axially protruding side surface on a further axially projecting from an axial end plate of the laminated core bending. Preferably, the further axially projecting side surface of the permanent magnet is approximately perpendicular to the azimuthal direction, so that the two respective folds protrude axially from the end plate similar to a wing door and help to keep the permanent magnet azimuthal in its position. By a non-positive connection between the permanent magnet and the folds and radial forces on the permanent magnets, in particular during a rotation of the rotor occurring centrifugal forces, at least partially absorbed.

It may prove to be advantageous if one or each axially projecting fold of the axial end plate comprises a further fold, which rests on the axial end face of the respective permanent magnet. As a result, axial forces on the respective permanent magnets, for example due to an unforeseen impact against the electromechanical machine, can also be absorbed by the or each fold, and the assembly of the respective permanent magnet is simplified.

Expediently, in addition, one or each axially protruding fold of the axial end plate on the side facing away from the stator after assembly in the circumferential direction on a supernatant, which presses the respective permanent magnet radially in the direction of the stator. This also simplifies assembly and further helps to easily hold the respective permanent magnet in its desired position.

It proves to be further advantageous if the rotor frame has a respective recess in the radial direction on a boundary surface of at least one permanent magnet remote from the stator after assembly, such that each radial connecting line passes from a point of the at least one permanent magnet to a lateral surface of the rotor facing away from the stator the respective recess leads. Such a recess impedes the short circuit of the magnetic field of the respective permanent magnet on the rotor frame, since the field from the north pole to the south pole of the permanent magnet must be closed around the recess, and thus less material of the rotor frame is available for short circuit, whereby the material at the same Residual flux density is rather magnetically saturable and thus a magnetization for short-circuit rejects easier than without recess. The suppression of the short circuit thus reduces power losses, as the electromechanical machine is effectively more flux density of a permanent magnet available.

In this case, one or each recess preferably at least partially surrounds the respective permanent magnet at its azimuthal boundary surfaces in the radial direction. This effectively increases the recess and thus extends the distance to be traveled for the short circuit of the field of the respective permanent magnet in the material of the rotor frame while simultaneously reducing the available magnetizable material of the rotor frame. As a result, the short circuit of the field is further complicated, which increases the performance of the electromechanical machine.

Conveniently, a number of resilient brackets is arranged in the recess, which presses the respective permanent magnet radially in the direction of the stator. This helps keep the respective permanent magnet in position in the radial direction with as little material as possible, which could short the field of the permanent magnet. In particular, for this purpose, the or each bracket can be made of the material of the rotor frame or of a dia- or paramagnetic material.

Advantageously, a number of gap-like recesses is provided in the rotor frame between two or two adjacent permanent magnets, which extends into the region of a Stator-side lateral surface of the rotor frame are formed out and which extend in the region of the stator lateral surface substantially in the radial direction. The result of this is that the magnetic flux flowing from the mutually facing, unipolarly magnetized surfaces of the respective adjacent permanent magnets can not form any order in the circular sector between the respective permanent magnets, but concentrically aligns radially with the stator and thus with the stator poles and thus with the magnetic flux Flow amplified in this area forming Rotorpols. This leads to a better flux linkage between the rotor and the stator and thus increases the performance of the electromechanical machine.

Preferably, the or each recess of the rotor frame is completely or partially filled with a dia- or paramagnetic filler, in particular with a plastic. This further enhances the concentration of magnetic flux of a rotor pole on the stator lateral surface.

Conveniently, the dia- or paramagnetic filler at at least one axial end of the rotor at least partially over a number of recesses and is used for balancing the rotor and / or has a shape of a fan blade on. This represents a particularly advantageous multi-purpose use of the filling material, with which the or each recess of the rotor frame is filled or filled. In particular, in this case of axially projecting filler material by a number formed as fan blades projections a fan may be formed, which can be used to cool a further arranged in the vicinity of the electromechanical machine device.

The second object is achieved by an electromechanical machine comprising a stator and a rotor of the type described above. The advantages of the rotor and its developments can be analogously transmitted to the electromechanical machine.

Embodiments of the invention will be explained with reference to drawings. Show

1 in an oblique view, a rotor with held by folds, axially projecting permanent magnet,

2 in an oblique view, a rotor with axially projecting permanent magnets and a magnet between the permanent magnet arranged soft magnetic material,

3 in an oblique view, a rotor with trapezoidal permanent magnets, around whose radially inner ends in the rotor frame wide recesses are made,

4 in a plan view a rotor with sections of trapezoidal permanent magnet,

5 in an oblique view, a rotor with partially chamfered permanent magnets, which are partially supported by brackets, and

6 in an oblique view, a rotor with Flußbarrieren, which are filled with a filling material.

In 1 is a rotor in the oblique view 1 shown in the rotor frame 2 a number of substantially cuboidal permanent magnets 4 is introduced. The permanent magnets 4 are in the rotor frame 2 rotationally symmetric with respect to an axis 5 , which as the axis of rotation of the rotor 1 is provided, arranged, and point with respect to the rotor frame 2 one axial projection each 6 on. In the radial direction are in the rotor frame 2 at the permanent magnets 4 inner recesses 8th or outer recesses 10 intended. Two adjacent permanent magnets 4 are at the respective mutually facing side surfaces 12 homopolar magnetized, so that in the circular sector 14 of the rotor frame 2 between the permanent magnets 4 a rotor pole 15 the corresponding polarity is formed. The rotor poles are made by thin webs 16 on an inner ring 18 of the rotor 1 held.

The rotor frame 2 is from a laminated core 19 made, the axial end plate 20 axial bends 22 which, at the azimuthal side surfaces 24 the axial overhangs 6 the permanent magnets 4 issue. The from the axial end plate 20 of the laminated core 19 protruding bends 22 have more bends 26 on, which at the axial end faces 28 the permanent magnets 4 rest. Furthermore, on each radially inner side of each fold 22 a supernatant 30 arranged, which at the axial projection of the inner radial end face 32 of the respective permanent magnet 4 rests.

By the axial projection 6 the permanent magnets 4 increases the available magnetic flux density. Due to the high magnetic resistance of the rotor 1 surrounding air becomes the additional field, which is defined by the axial projection 6 is generated, moving to a conclusion of the field lines over the rotor 1 to search. This leads in the area of the rotor poles 15 each to an increased magnetic flux, which leads to an improved linkage with the magnetic Flow leads, which is generated by a not shown in the drawing, radially outer stator pole.

The inner recesses 8th and the outer recesses 10 reduce the short circuit of the field of a permanent magnet 4 over the rotor frame 2 , On the inside, such a short circuit can only be done via a bridge 16 and the inner ring 18 of the rotor frame 2 to lead. The jetty 16 is therefore preferably designed so that it all on one of them with the inner ring 18 connected circular ring sector 14 occurring centrifugal forces in a rotation can, however, this is kept as narrow as possible, so that in the laminated core 19 Magnetic saturation occurs as quickly as possible at the bridge, which prevents another short circuit of the field.

The bends 22 simplify it, a permanent magnet 4 azimuthally in position. This can in particular by a non-positive connection on the axial projection 6 on both axial sides of the rotor 1 respectively. In addition, keep the bends 26 the permanent magnet 4 axially in position, and by the supernatant 30 becomes the permanent magnet 4 pressed radially outward in the direction of a stator not shown in detail in the drawing.

In 2 is a rotor in the oblique view 1 with axially over the rotor frame 2 protruding permanent magnets 4 shown, wherein between the respective axial projection 6 the permanent magnets 4 Circular sectors with soft magnetic material 40 are arranged. The permanent magnets 4 in this case are non-positively by strap 42 , each from the jetty 18 go out, held in their position. The soft magnetic material 40 is magnetized in this case, and contributes to the respective rotor pole 15 at. Since it is usually cheaper than the laminated core 19 from which the rotor frame 2 is manufactured, total costs can be saved.

In 3 is a rotor in the oblique view 1 with trapezoidal permanent magnets 4 shown. The inner recesses 8th in the rotor frame 2 in this case partially surround the respective permanent magnet 4 in the radial direction. This will cause the short circuit of the field of a permanent magnet 4 further complicated, since this on the radial inside only over the extended web 16 to the rotor pole 15 and the inner ring 18 can lead. The narrow extended bridge 16 In this case, due to a slight magnetic saturation, only a small amount of magnetic flux can be transmitted, making the short-circuit of the field more difficult. The permanent magnets 4 be in the inner recess 8th through comb-like structures 64 , which against the radially inner end face 32 push, force-locked in position. The comb-like structures 64 are on a wedge-shaped portion of the rotor frame 2 formed between the recess 8th and trapezoidal permanent magnet 4 is arranged.

In 4 is a rotor in plan view 1 with sections of trapezoidal permanent magnets 4 shown, which widen radially outwardly first trapezoidal and tapered trapezoidal to the radially outer end. By this taper to the outside are the permanent magnets 4 positively in the rotor frame 2 brought in. Further retaining lugs or stirrups for azimuthal or radial fixation are eliminated.

In 5 is a rotor in the oblique view 1 with axially projecting permanent magnets 4 shown, which in each case at the radially inner end face 32 in the axial direction with chamfers 44 are provided. The permanent magnets 4 be in the inner recess 8th by strap 42 , each from the jetty 16 go out and against the chamfer 44 push, and by strap 46 , which from the inner ring 18 of the rotor frame 2 go out and against the radially inner end face 32 push, force-locked in position.

In 6 is a rotor in the oblique view 1 with axially projecting permanent magnets 4 shown in the circular sectors 14 between every two adjacent permanent magnets 4 in the rotor frame 2 as river barriers gap-like recesses 50 are introduced, which to the outer surface 52 of the rotor 1 towards increasingly radial. The river barriers 50 as well as the inner recesses 8th and the outer recesses 10 are with a non-magnetic filler 54 filled, which in some places axially over the rotor frame 2 protrudes and there as a fan blade 56 is trained. The river barriers 50 provide a concentration of magnetic flux in the rotor poles 15 to the outer surface 52 of the rotor 1 out, leaving the flow of a rotor pole 15 an improved linkage with the flow of a corresponding stator pole 58 a stator 60 the electromechanical machine 62 having.

LIST OF REFERENCE NUMBERS

1

rotor

2

rotor frame

4

permanent magnet

5

axis

6

axial projection of a permanent magnet

8th

inner recess

10

outer recess

12

Side surface of a permanent magnet

14

Annular sector between two adjacent permanent magnets

15

rotor pole

16

Bridge to the circular ring sector

18

Inner ring of the rotor frame

19

laminated core

20

axial end plate of the rotor frame

22

axial fold

24

azimuthal side surface of the axial supernatant

26

fold

28

axial end face of a permanent magnet

30

Overhang on a fold

32

radially inner end face of a permanent magnet

40

soft magnetic material

42

hanger

44

Chamfer on a permanent magnet

46

hanger

50

slit-like recess as a river barrier

52

outer surface of the rotor

54

non-magnetic filler

56

fan blade

58

stator

60

stator

62

electromechanical machine

64

comb-like structure

Claims (17)

Rotor ( 1 ) for an electromechanical machine ( 62 ), which for rotation about an axis ( 5 ) with respect to a stator ( 60 ), comprising a rotor frame ( 2 ) and permanent magnets ( 4 ), wherein the permanent magnets ( 4 ) in pockets, which in the azimuthal direction in the rotor frame ( 2 ), are introduced, wherein the permanent magnets ( 4 ) are magnetized in the azimuthal direction, and wherein each two adjacent permanent magnets ( 4 ) are each facing the same pole, characterized in that the permanent magnets ( 4 ) in the axial direction over the rotor frame ( 6 ). Rotor ( 1 ) for an electromechanical machine ( 62 ), which for rotation about an axis ( 5 ) with respect to a stator ( 60 ), comprising a rotor frame ( 2 ) and permanent magnets ( 4 ), wherein the permanent magnets ( 4 ) in pockets, which in the azimuthal direction in the rotor frame ( 2 ), are introduced, wherein the permanent magnets ( 4 ) are magnetized in the azimuthal direction, and wherein each two adjacent permanent magnets ( 4 ) each facing the same pole, in particular rotor ( 1 ) according to claim 1, characterized in that a number of permanent magnets ( 4 ) one to the axis ( 5 ) has orthogonal cross section, which is at least partially trapezoidal deviating from a rectangular shape. Rotor ( 1 ) according to claim 1, characterized in that at the axial boundary surfaces of the rotor frame ( 2 ) between the axially projecting permanent magnets ( 4 ) a soft magnetic material ( 40 ) is arranged. Rotor ( 1 ) according to one of the preceding claims, characterized in that the rotor frame ( 2 ) from a laminated in the axial direction laminated core ( 19 ) is made. Rotor ( 1 ) according to one of the preceding claims, characterized in that as permanent magnets ( 4 ) sintered ferrite magnets and / or plastic-bonded permanent magnets are used. Rotor ( 1 ) according to one of the preceding claims, characterized in that at least one edge of at least one permanent magnet ( 4 ) is chamfered ( 44 ). Rotor ( 1 ) according to one of the preceding claims, characterized in that one or each permanent magnet ( 4 ) in the rotor frame ( 2 ) is pressed and / or poured. Rotor ( 1 ) according to one of claims 4 to 7, characterized in that at least one axially over the rotor frame ( 2 ) protruding permanent magnet ( 4 ) on at least one of its axially projecting side surfaces ( 24 ) of one of an axial end plate ( 20 ) of the laminated core ( 19 ) axially projecting fold ( 22 ) is present. Rotor ( 1 ) according to claim 8, characterized in that one or each axially protruding fold ( 22 ) of the axial end plate ( 20 ) another fold ( 26 ), which of the axial end face ( 28 ) of the respective permanent magnet ( 4 ) rests. Rotor ( 1 ) according to claim 8 or claim 9, characterized in that one or each axially protruding fold ( 22 ) of the axial end plate ( 20 ) at the stator ( 60 ) after assembly facing away in the circumferential direction a supernatant ( 30 ), which the respective permanent magnet ( 4 ) radially in the direction of the stator ( 60 ) presses. Rotor ( 1 ) according to one of the preceding claims, characterized in that the rotor frame ( 2 ) on a stator ( 60 ) after assembly facing away from the interface ( 32 ) at least one permanent magnet ( 4 ) in the radial direction in each case a recess ( 8th ) such that each radial connecting line from a point of the at least one permanent magnet ( 4 ) to a stator ( 60 ) facing away from the lateral surface of the rotor ( 1 ) through the respective recess ( 8th ) leads. Rotor ( 1 ) according to claim 11, characterized in that one or each recess ( 8th ) the respective permanent magnet ( 4 ) at its azimuthal interfaces ( 12 ) at least partially surrounds in the radial direction. Rotor ( 1 ) according to claim 11 or claim 12, characterized in that in the recess ( 8th ) a number of resilient straps ( 42 . 46 ) is arranged, which the respective permanent magnet ( 4 ) radially in the direction of the stator ( 60 ) presses. Rotor ( 1 ) according to one of the preceding claims, characterized in that in the rotor frame ( 2 ) between two or two adjacent permanent magnets ( 4 ) a number of slit-like recesses ( 50 ) is provided, which up to the area of a stator after lateral side surface ( 52 ) of the rotor frame ( 2 ) are formed and which in the region of the stator lateral surface ( 52 ) extend substantially in the radial direction. Rotor ( 1 ) according to any one of claims 11 to 14, characterized in that the or each recess ( 8th . 10 . 50 ) of the rotor frame ( 2 ) in whole or in part with a dia- or paramagnetic filler ( 54 ), in particular with a plastic, is filled. Rotor according to claim 15, characterized in that the dia- or paramagnetic filling material ( 54 ) at at least one axial end of the rotor ( 1 ) partially over a number of recesses ( 8th . 10 . 50 ) and while balancing the rotor ( 1 ) is inserted and / or a form of a fan blade ( 56 ) having. Electromechanical machine ( 62 ) comprising a stator ( 60 ) and a rotor ( 1 ) according to any one of claims 1-16.

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