DE102016212022A1 - rotor - Google Patents

Abstract

For manufacturing cost reduction while maintaining power and torque comprises the rotor (100) of an IPM machine with a magnetically conductive rotor core (102) to each magnetic pole of the rotor (100) has a first, second, third and fourth recess (106, 107, 110, 111), in which at least a first, second, third or fourth permanent magnet (125, 126) is arranged, wherein • first and second recess in opening to the rotor core outer surface (109) opening first (108) and third and fourth recess in itself the second "V" -shaped configuration (112) opening towards the rotor core outer surface is arranged relative to one another, • the second "V" -shaped configuration is interleaved with the recesses of the first "V" -shaped configuration, • the permanent magnets with ferrite material, preferably completely, are formed, • in particular the recesses along the legs of the "V" -shaped designs are larger, preferably multiple, particular s preferably at least three times, as transverse to, • further in particular the permanent magnets are at least largely, preferably at least almost completely, magnetized along the smaller dimension of the recesses.

Description

The invention relates to a rotor of a permanent magnet excited electric machine. The invention further relates to a permanent magnet excited electrical machine. The invention also relates to a vehicle, in particular a road vehicle.

State of the art

Like in the DE 10 2014 102 411 A1 As shown, IPM machines include a rotor having a plurality of alternating polarity magnets disposed around an outer circumference of the rotor. The rotor is rotatable within a stator containing multiple windings. The rotor interacts magnetically with the stator to produce rotation of the rotor about an axis of rotation. An IPM machine can use either ferrite magnets or rare earth magnets, such as neodymium-iron-boron - NdFeB - formed in the rotor. Ferrite magnets are less expensive than rare-earth magnets, but produce lower power when used in identically designed IPM machines.

From the DE 10 2014 102 411 A1 Now, a rotor core for an internal permanent magnet machine is known which includes at least one ferrite pole and at least one rare earth pole arranged in an alternating relationship radially about an axis. The ferrite poles define a plurality of first pole cavities, and the rare earth poles define a plurality of second pole cavities. One of the plurality of ferrite magnets is disposed in each of the first pole cavities of the ferrite poles, and one of the plurality of rare earth magnets is disposed in each of the second pole cavities of the rare earth poles.

This rotor core is thus designed for mixed assembly with magnets of different materials. In this case, the second pole cavities for the rare earth magnets are arranged in mutually interleaved V-shape, wherein smaller magnets form an internal "V" and larger magnets form an outboard "V". The rare earth magnets may completely fill the second pole cavities, or they may leave one or more air gaps between the rare earth magnets and the respective second pole cavities. Thus, it is shown that at the foot and at the end of the legs of the V-forms - the large "V" as well as the small "V" - each one Luftkavität is arranged. These air cavities immediately adjoin the rare earth magnets and are essentially three-sided.

The rotor assembly of DE 10 2014 102 411 A1 Thus, both ferrite magnets and rare earth magnets are arranged in alternating poles to minimize the volume of rare earth magnets, while substantially maintaining the performance of an equivalent rotor assembly of only rare earth magnets. Minimizing the bulk of the rare earth magnets reduces the manufacturing cost of the rotor assembly as compared to a rotor assembly of only rare earth magnets.

Also the DE 10 2010 002 786 A1 shows an IPM machine of the type, as used for example for drive motors and hybrid electric vehicles. This machine comprises a rotor having a plurality of ferrite magnets arranged in one or more layers, wherein at least one of the layers comprises rare earth magnets - eg NdFeB magnets - adjacent to the ferrite magnets to avoid demagnetization or to reduce. In the spatial arrangement of the magnets to each other "V" shape - the "inner V" - and arc shape - the "outer V" - combined. In this spatial arrangement, each adjacent pair of "V" shape magnet on the one hand and arcuate on the other hand may be separated by an air gap or other non-magnetic material - eg, plastic or the like.

DESCRIPTION OF THE INVENTION: Problem, Solution, Advantages

The object of the invention is to further reduce the manufacturing costs of an IPM machine while retaining the greatest possible power and torque, in particular due to the described use of rare-earth magnets in the rotor.

• • eine erste Ausnehmung, in der wenigstens ein erster Dauermagnet angeordnet ist,
• • eine zweite Ausnehmung, in der wenigstens ein zweiter Dauermagnet angeordnet ist,
• • eine dritte Ausnehmung, in der wenigstens ein dritter Dauermagnet angeordnet ist,
• • eine vierte Ausnehmung, in der wenigstens ein vierter Dauermagnet angeordnet ist,

wobei

• • die erste und zweite Ausnehmung in sich zur Rotorkernaußenfläche hin öffnender erster "V"-förmiger Gestaltung und
• • die dritte und vierte Ausnehmung in sich zur Rotorkernaußenfläche hin öffnender zweiter "V"-förmiger Gestaltung

zueinander angeordnet sind,

• • erste und zweite "V"-förmige Gestaltung ineinander derart verschachtelt sind, dass sich die zweite "V"-förmige Gestaltung zwischen den Ausnehmungen der ersten "V"-förmigen Gestaltung befindet,
• • die Dauermagnete mit Ferritwerkstoff ausgebildet, vorzugsweise vollständig aus Ferritwerkstoff gebildet, sind,
• • insbesondere die Ausnehmungen in einer Erstreckung entlang der Schenkel der "V"-förmigen Gestaltungen eine größere, bevorzugt um ein Mehrfaches größere, Abmessung aufweisen als in einer Erstreckung quer zu den Schenkeln der "V"-förmigen Gestaltungen, besonders bevorzugt wenigstens die dreifache Abmessung,
• • weiter insbesondere eine Magnetisierungsrichtung der Dauermagnete wenigstens weitgehend, bevorzugt wenigstens nahezu vollständig, entlang der geringeren Abmessung der Ausnehmungen ausgerichtet ist.

This object is achieved by a rotor of a permanent magnet-excited electric machine with a magnetically conductive rotor core, which comprises to each magnetic pole of the rotor:

• A first recess, in which at least one first permanent magnet is arranged,
• A second recess, in which at least one second permanent magnet is arranged,
• A third recess in which at least one third permanent magnet is arranged,
• A fourth recess in which at least one fourth permanent magnet is arranged,

in which

• • The first and second recess in opening toward the rotor core outer surface first "V" -shaped design and
• The third and fourth recesses have a second "V" -shaped configuration opening towards the rotor core outer surface

are arranged to each other,

• First and second "V" -shaped designs are interleaved with each other such that the second "V" -shaped configuration is located between the recesses of the first "V" -shaped configuration,
• The permanent magnets are formed with ferrite material, preferably formed entirely of ferrite material,
• In particular, the recesses in an extension along the legs of the "V" -shaped designs have a larger, preferably several times greater, dimension than in an extension transverse to the legs of the "V" -shaped designs, more preferably at least three times the dimension .
• • Furthermore, in particular a magnetization direction of the permanent magnets at least largely, preferably at least almost completely, along the smaller dimension of the recesses is aligned.

In this arrangement, the permanent magnets can be arranged individually in each one of the recesses. Optionally, two or more permanent magnets in each one of the recesses may be arranged next to and / or behind one another. An arrangement next to each other means that two or more permanent magnets with their magnetic north poles on the one hand and their magnetic south poles on the other hand are positioned adjacent to each other; i.e. Same magnetic poles of the permanent magnets are adjacent to each other. In an arrangement in succession, a magnetic pole of a first of the permanent magnets in the direction of a magnetization of the permanent magnets connects to a counterpart magnetic pole of an adjacent second of the permanent magnets; e.g. a magnetic north pole of the first permanent magnet to a magnetic south pole of the second permanent magnet.

The rotor core outer surface is equal to the rotor outer surface, i. coincides with an at least substantially circular cylindrical surface of the rotor. With the direction indication "to the rotor core outer surface" is then designated by a rotational axis of the rotor and thus the rotor core in the radial direction outward direction. Incidentally, the recesses extend in the axial direction of the rotor and thus of the rotor core, i. in the direction of the axis of rotation, at least partially, preferably completely, over at least one axial section of the rotor or of the rotor core. The rotor may preferably be constructed with a plurality of such axial sections, also referred to as segments. Particularly preferably, the individual segments about the rotational axis against each other by a predetermined angle - the helix angle - arranged twisted. For example, 6 segments are provided, with two each in the axial direction immediately adjacent segments are rotated by 1 angle degree against each other. This twisted arrangement - referred to as a skew - serves to reduce the so-called Nutrastmoments the electric machine.

By configuring the recesses and thus the permanent magnets to be arranged therein in a first and a second "V" -shaped configuration and by the nested arrangement of the first and the second "V" -shaped configuration, in which the first and second recesses of the first "V" -shaped design lie outside and the third and fourth recesses of the second "V" -shaped design are embedded inside in the first "V" -shaped design, both a basic moment and in particular a reluctance torque of the electric machine are increased; this increase is particularly large in comparison with an arrangement in which only a single "V" -shaped design is provided per magnetic pole of the rotor. This makes it possible to use permanent magnets formed in the rotor with ferrite material instead of rare-earth magnets and, despite the lower magnetization of the ferrite permanent magnets, i. their compared to rare earth magnets lower permanent magnet flux to achieve high performance of the machine. In this configuration, all the permanent magnets in the rotor may preferably be formed exclusively with ferrite material while the machine still has high power. The invention thus enables a cost-effective production of a powerful machine.

The preferred embodiment, wherein the recesses extend in an extent along the legs of the "V" -shaped designs, preferably a multiple times greater dimension than in an extension transverse to the legs of the "V" -shaped designs, and in the further the magnetization direction of the permanent magnets along the smaller dimension of the recesses is aligned, allows the use of flat, space and material-saving permanent magnets and thus a compact, high-performance rotor assembly.

Advantageous embodiments of the invention are characterized in the subclaims.

• • sind radial einwärts gerichtete Enden der ersten und zweiten Ausnehmung von einer Rotorkerninnenfläche nur durch eine radiale Abmessung eines wenigstens nahezu ringförmigen inneren Rotorkern-Tragbereichs, der sich in Umfangsrichtung des Rotorkerns – und damit des Rotors – entlang der Rotorkerninnenfläche erstreckt, beabstandet

und/oder

• • sind radial auswärts gerichtete Enden der ersten, zweiten, dritten und vierten Ausnehmung von der Rotorkernaußenfläche nur durch eine radiale Abmessung eines wenigstens nahezu ringförmigen äußeren Rotorkern-Tragbereichs, der sich in Umfangsrichtung des Rotorkerns entlang der Rotorkernaußenfläche erstreckt, beabstandet.

According to a preferred embodiment of the rotor according to the invention

• • are radially inwardly directed ends of the first and second recesses of a rotor core inner surface only by a radial dimension of at least a substantially annular inner rotor core support portion which extends in the circumferential direction of the rotor core - and thus the rotor - along the rotor core inner surface, spaced

and or

• • radially outward-facing ends of the first, second, third and fourth recesses are spaced from the rotor core outer surface only by a radial dimension of an at least substantially annular outer rotor core support portion extending circumferentially of the rotor core along the rotor core outer surface.

The rotor core inner surface is a preferably circular-cylindrical or at least substantially circular-cylindrical boundary of the rotor core to a rotor shaft, which is preferably rotationally symmetrical in the rotor core and arranged centrally; the latter is preferably formed with non-magnetic material. The rotor core inner surface is formed as an inner surface of a space region of the rotor core, which is preferably - but not necessarily - integrally formed from material of the rotor core, ie in particular magnetically conductive material, but which primarily serves a mechanical transmission of forces between the rotor core and rotor shaft. This space area of the rotor core encloses the rotor shaft at least approximately annular, i. at least nearly circular cylindrical and is referred to here as the inner rotor core support area. In particular, this inner rotor core support portion serves to accommodate mechanical stresses caused by centrifugal forces and torques acting on the rotor during operation, but also by mechanical stresses on the rotor core from manufacture, e.g. by shrinking onto the rotor shaft. The radial dimension of this inner rotor core support region is selected to be as small as is possible by the mechanical loads mentioned, so that the first and second recesses and thus the permanent magnets arranged therein extend as close as possible to the rotor core inner surface.

The outer rotor core support portion corresponds in material, design and purpose to the inner rotor core support portion and defines the rotor core along the rotor core outer surface. The outer rotor core support region extends in the circumferential direction of the rotor and thus of the rotor core along the rotor core outer surface and serves essentially for absorbing centrifugal forces in the rotor, in particular centrifugal forces exerted on the permanent magnets in the recesses. The radial dimension of this outer rotor core support area is chosen to be as low as the mechanical loads mentioned so that the recesses and thus the permanent magnets arranged therein extend as close as possible to the rotor core outer surface.

Overall, it is thus achieved that the recesses and thus the permanent magnets arranged therein extend radially over as large a part as possible of the radial dimension of the rotor core. In particular, with an orientation of the magnetization of the permanent magnets transversely to the legs of the "V" -shaped configurations, these permanent magnets transversely to their magnetization receive a maximum dimension by this extension of the recesses and thus the permanent magnets arranged therein, whereby the permanent magnet flux is increased. For a given pole pitch of the magnetic poles of the rotor, this extension of the recesses also causes the legs of the "V" shaped configurations to be as steep as possible within the pole pitch, i. at the lowest possible angle to each other.

In a further preferred embodiment of the rotor according to the invention, the at least one permanent magnet extend at least almost completely over the respective recesses, the recesses concerned at least almost completely filling. Optionally, at least one of the recesses at least one air pocket at a radially inwardly and / or at a radially outwardly directed end.

As air pockets are here generally kept free of rotor core material and permanent magnets, magnetically non-conductive space areas in the rotor core. As magnetically non-conductive space regions are designated space regions whose relative magnetic permeability is at least almost equal to 1, that is at least almost equal to that of the vacuum.

For a radial direction, i. here along the legs of the "V" -shaped designs, as far as possible extension of the recesses and the permanent magnets received therein air pockets of the type mentioned are to be minimized as possible; On the other hand, stray fluxes are reduced by the air pockets and thus the performance of the machine is increased. Air pockets with very small dimensions, preferably smaller dimensions than the smallest of the dimensions of the permanent magnets, are preferred here, however, since this makes it possible to obtain large dimensions of the permanent magnets with a correspondingly high permanent magnet flux.

• • weisen die erste und die zweite Ausnehmung in einer Erstreckung entlang der Schenkel der ersten "V"-förmigen Gestaltung eine größere, bevorzugt wenigstens nahezu die doppelte, Abmessung auf als die dritte und die vierte Ausnehmung entlang der Schenkel der zweiten "V"-förmigen Gestaltung

und/oder

• • weisen die erste und die zweite Ausnehmung in einer Erstreckung quer zu den Schenkeln der ersten "V"-förmigen Gestaltung eine größere, bevorzugt um wenigstens nahezu 10% größere, Abmessung auf als die dritte und die vierte Ausnehmung quer zu den Schenkeln der zweiten "V"-förmigen Gestaltung

und/oder

• • ist ein Öffnungswinkel der Schenkel der zweiten "V"-förmigen Gestaltung größer, bevorzugt um wenigstes nahezu 20% größer, als ein Öffnungswinkel der Schenkel der ersten "V"-förmigen Gestaltung.

According to a further preferred embodiment of the rotor according to the invention

• • The first and the second recess in a dimension along the legs of the first "V" -shaped design a larger, preferably at least almost twice the dimension as the third and the fourth recess along the legs of the second "V" -shaped layout

and or

• The first and the second recess have a larger, preferably at least approximately 10% larger, dimension than the third and the fourth recess, transversely to the legs of the first "V" -shaped configuration, in an extension transverse to the legs of the second " V "-shaped design

and or

• • An opening angle of the legs of the second "V" -shaped design is larger, preferably at least nearly 20% larger than an opening angle of the legs of the first "V" -shaped design.

In a preferred magnetization direction of the permanent magnets, which extends transversely to the legs of the "V" -shaped designs, thus the first and second recesses for magnetization thicker and transverse to the magnetization direction permanent magnets are formed as the third and fourth recesses.

Advantageously continue to border the third and the fourth recess at their radially inwardly directed ends as closely as possible, only separated by a supporting web of rotor core material, which serves to absorb centrifugal forces and is so narrow, as it is possible for a fulfillment of this purpose. This also litter flows are avoided or reduced.

According to a preferred embodiment of the rotor according to the invention, the first recess extends to a first of the magnetic poles of the rotor at least almost parallel to the circumferentially immediately adjacent second recess of a circumferentially to the first of the magnetic poles of the rotor immediately adjacent second of the magnetic poles of the rotor. In this case, then an opening angle of the first "V" -shaped design is at least almost equal to an angle of the pole pitch of the magnetic poles of the rotor. Sections of the rotor material between the individual magnetic poles of the rotor in this case have along their extent in the radial direction at least almost uniform width in the circumferential direction of the rotor.

• • erstreckt sich wenigstens eine magnetisch nichtleitende, bevorzugt viereckige, flusslenkende Ausnehmung entlang der Umfangsrichtung des Rotorkerns zwischen radial einwärts gerichteten Enden der ersten und zweiten Ausnehmung,
• • sind insbesondere mehrere derartige magnetisch nichtleitende, bevorzugt viereckige, flusslenkende Ausnehmungen zwischen den radial einwärts gerichteten Enden der ersten und zweiten Ausnehmung vorzugsweise entlang der Umfangsrichtung aneinandergereiht und durch, bevorzugt mit dem Rotorkern einstückig aus Rotorkernwerkstoff gebildete, Tragstege voneinander getrennt.

In a further preferred embodiment of the rotor according to the invention

• At least one magnetically nonconductive, preferably quadrangular, flux-guiding recess extends along the circumferential direction of the rotor core between radially inwardly directed ends of the first and second recesses,
• • are in particular a plurality of such magnetically non-conductive, preferably quadrangular, flux-guiding recesses between the radially inwardly directed ends of the first and second recesses preferably lined up along the circumferential direction and separated by, preferably integrally formed with the rotor core of rotor core material, supporting webs.

This at least one flux-guiding recess, preferably also designed as Luftkavität, serves in particular to reduce or prevent magnetic leakage flux from the permanent magnets in the first and second recess in the inner rotor core support area and the rotor shaft, which would worsen the basic moment of the machine. The at least one flow-guiding recess is provided with respect to the first and the second recess, in particular by the centrifugal force absorption and separated as thin as possible supporting webs for an effective flow control; further support webs are provided between two or more such flux-guiding recesses. If a plurality of these flux-guiding recesses provided, they can be strung together both in the circumferential direction and in the radial direction - separated by support webs.

As a result of the above-described design features of the rotor according to the invention, an optimum configuration for a high torque of the electric machine, i. achieved both a high base torque and a high reluctance torque, wherein the rotor core is designed for optimal force absorption and for the greatest possible leakage flux reduction.

According to a preferred development of the rotor according to the invention, at least one recess for receiving at least one fastening means is arranged in the rotor core in a space region between the first and the second recess, in particular between radially inwardly directed ends of the first and the second recess. Preferably, the at least one fastening means is adapted, in a rotor whose rotor core is constructed with two or more rotor core elements, in particular rotor lamination sections, to connect the rotor core elements, in particular rotor lamination sections, of at least one segment of the rotor. Particularly preferably, the at least one fastening means is designed to connect at least almost all rotor core elements, in particular rotor sheet sections, of all segments of the rotor with one another. Advantageously, the at least one fastening means with a screw, preferably with bolts configured; optionally rivets, staples or the like can be used. In order to easily obtain the above-described skew, the at least one recess for receiving the at least one fastener from a segment to the next segment in the axial direction by the helix angle in the circumferential direction about the rotation axis is preferably rotated in the rotor core element, in particular rotor lamination cut positioned. In this way, the skewing results in the threading of the rotor core elements, in particular rotor laminations, on the at least one fastening means, in particular bolts, in the desired order by itself.

The recesses are dispensable when the rotor core elements, in particular rotor laminations, are connected by other means, e.g. by gluing, in particular with an electrically insulating adhesive, or the like.

The above object is further achieved by a rotor core element, in particular a rotor lamination section, which is characterized by an embodiment having the features of a rotor of the aforementioned type.

• • eine erste Ausnehmung, in der wenigstens ein erster Dauermagnet angeordnet ist,
• • eine zweite Ausnehmung, in der wenigstens ein zweiter Dauermagnet angeordnet ist,
• • eine dritte Ausnehmung, in der wenigstens ein dritter Dauermagnet angeordnet ist,
• • eine vierte Ausnehmung, in der wenigstens ein vierter Dauermagnet angeordnet ist.

The rotor core element according to the invention, in particular the rotor laminated section according to the invention, for the magnetically conductive rotor core according to the invention of the rotor of the permanent magnet excited electric machine according to the invention therefore comprises for each magnetic pole of the rotor:

• A first recess, in which at least one first permanent magnet is arranged,
• A second recess, in which at least one second permanent magnet is arranged,
• A third recess in which at least one third permanent magnet is arranged,
• • A fourth recess in which at least a fourth permanent magnet is arranged.

• • die erste und zweite Ausnehmung in sich zur Rotorkernaußenfläche hin öffnender erster "V"-förmiger Gestaltung und
• • die dritte und vierte Ausnehmung in sich zur Rotorkernaußenfläche hin öffnender zweiter "V"-förmiger Gestaltung

zueinander angeordnet, wobei

• • die erste und die zweite "V"-förmige Gestaltung ineinander derart verschachtelt sind, dass sich die zweite "V"-förmige Gestaltung zwischen den Ausnehmungen der ersten "V"-förmigen Gestaltung befindet.

There are

• • The first and second recess in opening toward the rotor core outer surface first "V" -shaped design and
• The third and fourth recesses have a second "V" -shaped configuration opening towards the rotor core outer surface

arranged to each other, wherein

• The first and second "V" -shaped designs are interleaved with each other such that the second "V" -shaped configuration is located between the recesses of the first "V" -shaped configuration.

In a preferred development of this rotor core element according to the invention, moreover, the recesses have, in an extension along the limbs of the "V" -shaped designs, a larger, preferably several times larger, dimension than in an extension transverse to the limbs of the "V" -shaped configurations , more preferably at least three times the size.

• • sind radial einwärts gerichtete Enden der ersten und zweiten Ausnehmung von einer Rotorkerninnenfläche nur durch eine radiale Abmessung eines wenigstens nahezu ringförmigen inneren Rotorkern-Tragbereichs, der sich in Umfangsrichtung des Rotorkernelements entlang der Rotorkerninnenfläche erstreckt, beabstandet

und/oder

• • sind radial auswärts gerichtete Enden der ersten, zweiten, dritten und vierten Ausnehmung von der Rotorkernaußenfläche nur durch eine radiale Abmessung eines wenigstens nahezu ringförmigen äußeren Rotorkern-Tragbereichs, der sich in Umfangsrichtung des Rotorkernelements entlang der Rotorkernaußenfläche erstreckt, beabstandet.

According to a preferred embodiment of the rotor core element according to the invention, in particular rotor lamination section, for the rotor according to the invention

• • radially inwardly directed ends of the first and second recesses are spaced from a rotor core inner surface only by a radial dimension of an at least substantially annular inner rotor core support portion extending circumferentially of the rotor core member along the rotor core inner surface

and or

• • radially outward-facing ends of the first, second, third and fourth recesses are spaced from the rotor core outer surface only by a radial dimension of an at least substantially annular outer rotor core support portion extending circumferentially of the rotor core member along the rotor core outer surface.

In a further preferred embodiment of the rotor core element according to the invention, the recesses are designed such that the at least one permanent magnets extend at least almost completely over the respective recesses, at least almost completely filling the respective recesses. Optionally, at least one of the recesses at least one air pocket at a radially inwardly and / or at a radially outwardly directed end.

• • weisen die erste und die zweite Ausnehmung in einer Erstreckung entlang der Schenkel der ersten "V"-förmigen Gestaltung eine größere, bevorzugt wenigstens nahezu die doppelte, Abmessung auf als die dritte und die vierte Ausnehmung entlang der Schenkel der zweiten "V"-förmigen Gestaltung

und/oder

• • weisen die erste und die zweite Ausnehmung in einer Erstreckung quer zu den Schenkeln der ersten "V"-förmigen Gestaltung eine größere, bevorzugt um wenigstens nahezu 10% größere, Abmessung auf als die dritte und die vierte Ausnehmung quer zu den Schenkeln der zweiten "V"-förmigen Gestaltung

und/oder

• • ist ein Öffnungswinkel der Schenkel der zweiten "V"-förmigen Gestaltung größer, bevorzugt um wenigstes nahezu 20% größer, als ein Öffnungswinkel der Schenkel der ersten "V"-förmigen Gestaltung.

In a further preferred embodiment of the rotor core element according to the invention

• • The first and the second recess in a dimension along the legs of the first "V" -shaped design a larger, preferably at least almost twice the dimension as the third and the fourth recess along the legs of the second "V" -shaped layout

and or

• The first and the second recess have a larger, preferably at least approximately 10% larger, dimension than the third and the fourth recess, transversely to the legs of the first "V" -shaped configuration, in an extension transverse to the legs of the second " V "-shaped design

and or

• • An opening angle of the legs of the second "V" -shaped design is larger, preferably at least nearly 20% larger than an opening angle of the legs of the first "V" -shaped design.

Further preferably, in the rotor core element according to the invention, the first recess extends to a first of the magnetic poles of the rotor at least almost parallel to the circumferentially immediately adjacent second recess of a circumferentially to the first of the magnetic poles of the rotor immediately adjacent second of the magnetic poles of the rotor.

• • erstreckt sich wenigstens eine magnetisch nichtleitende, bevorzugt viereckige, flusslenkende Ausnehmung entlang der Umfangsrichtung des Rotorkernelements zwischen radial einwärts gerichteten Enden der ersten und zweiten Ausnehmung, und
• • sind insbesondere mehrere derartige magnetisch nichtleitende, bevorzugt viereckige, flusslenkende Ausnehmungen zwischen den radial einwärts gerichteten Enden der ersten und zweiten Ausnehmung vorzugsweise entlang der Umfangsrichtung aneinandergereiht und durch, bevorzugt mit dem Rotorkernelement einstückig aus Rotorkernwerkstoff gebildete, Tragstege voneinander getrennt.

In a further preferred embodiment of the rotor core element according to the invention

• • extends at least one magnetically non-conductive, preferably quadrangular, flux-guiding recess along the circumferential direction of the rotor core element between radially inwardly directed ends of the first and second recesses, and
• • In particular, a plurality of such magnetically non-conductive, preferably quadrangular, flux-guiding recesses between the radially inwardly directed ends of the first and second recesses preferably strung together along the circumferential direction and separated by, preferably integrally formed with the rotor core element of rotor core material, support webs.

Finally, according to a preferred embodiment of the rotor core element according to the invention in a space between the first and the second recess, in particular between radially inwardly directed ends of the first and the second recess, arranged in the rotor core element at least one recess for receiving at least one fastening means.

The rotor core element according to the invention, in particular the rotor lamination section, can be produced inexpensively in a simple manner since it can be formed with simple contours which can be easily produced by conventional machining methods, e.g. by punching or the like. It is just as easy to produce a rotor core for a rotor with the described features and advantages as well as a total of the rotor described with the rotor core element according to the invention, in particular rotor lamination section.

The above object is also achieved by a permanent magnet excited electric machine having a rotor of the type described above and / or a rotor core element, in particular a rotor lamination section, of the type described above. The machine designed according to the invention can be produced with cost-effective materials, in particular cost-effective permanent magnets made of ferrite material, and has a high performance, in particular a high power density on. An equipment of the electric machine with expensive rare earth magnets is therefore unnecessary.

Finally, the above-mentioned object is also achieved by a vehicle, in particular a road vehicle, which has a permanently magnetically excited electric machine of the aforementioned type and / or is equipped with a machine which is formed with a rotor of the type described above, and / or the one Machine having a rotor core element, in particular rotor lamination section, the aforementioned type. The vehicle can be equipped in this way with a cost-effective and powerful drive, in particular traction drive.

Brief description of the drawings

Embodiments of the invention are illustrated in the drawings and will be described in more detail below, with matching elements in all figures are given the same reference numerals and a repeated description of these elements is omitted. Show it:

1 an example of a rotor lamination formed according to the invention for a magnetically conductive rotor core of a rotor according to the invention of a permanent-magnet-excited electric machine according to the invention as a total view in a plan view in the axial direction,

2 a section from 1 with a configuration for a magnetic pole of the rotor with the rotor lamination section according to 1 and

3 a dimensioning example of a preferred sizing of the configuration 2 ,

Preferred embodiment of the invention

In 1 is with the reference numeral 101 an example of an inventively designed rotor sheet section as a rotor core element for a magnetically conductive rotor core 102 an example of a rotor according to the invention 100 and in a plan view in the axial direction, ie in the direction of a rotation axis 103 of the rotor 100 , reproduced. The rotor core 102 and thus the rotor 100 extends in the axial direction into the plane of the drawing. The rotor 100 is intended for use in a permanent magnet-excited electric machine according to the invention, in particular an induction machine. The rotor 100 for example 1 has ten magnetic poles whose center position in the circumferential direction 104 through from the axis of rotation 103 radially outwardly directed pole axes 105 is indicated, however, any other number of magnetic poles is also possible. Each two adjacent magnetic poles, ie their pole axes 105 , are in the circumferential direction 104 spaced apart by a pole angle W1. Because of the axial extent are the pole axes 105 strictly speaking, surfaces extending in the axial direction, and the magnetic poles form axially aligned strips. For each of the magnetic poles has the rotor sheet section 101 and thus the rotor core 102 a configuration of also extending in the axial direction recesses, which in the one Z marked section 1 after the detailed image 2 with the corresponding dimensioning example 3 is shown in more detail.

This configuration according to 2 includes a first recess for each of the magnetic poles 106 and a second recess 107 moving in to a rotor core outer surface 109 opening first "V" -shaped design 108 are arranged to each other. The rotor core outer surface 109 forms a radially outwardly facing edge of the rotor core 102 and at the same time the rotor 100 and is preferably circular cylindrical and to the axis of rotation 103 designed rotationally symmetrical. At the rotor core outer surface 109 points the rotor core 102 and thus the rotor 100 a first diameter labeled D1. The first recess 106 and the second recess 107 as well as the first "V" -shaped design 108 are to the respective polar axis 105 formed symmetrically. Furthermore, the configuration according to 2 for each of the magnetic poles, a third recess 110 and a fourth recess 111 in a way to the rotor core outer surface 109 opening second "V" -shaped design 112 are arranged to each other. The third recess 110 and the fourth recess 111 as well as the second "V" -shaped design 112 are also to the pole axis mentioned 105 formed symmetrically. Here are the first and the second "V" -shaped design 108 . 112 interleaved in such a way that the second "V" -shaped design 112 between the first recess 106 and the second recess 107 the first "V" -shaped design 108 located.

The first, second, third and fourth recesses 106 . 107 . 110 . 111 have radially outward ends 113 . 114 . 115 respectively. 116 on the outside of the rotor core 109 only by an at least nearly annular outer rotor core support area 117 are spaced, extending in the circumferential direction 104 of the rotor core 102 along the rotor core outer surface 109 extends. The outer rotor core support area 117 points in the radial direction of the rotor core 102 a radial dimension denoted by D8, which results as half the difference of the first diameter D1 and a second diameter D2; the second diameter D2 describes the radial position of the radially outward ends 113 . 114 . 115 respectively. 116 , The radial dimension D8 is dimensioned as small as when taking into account the rotor core 102 occurring mechanical loads is possible.

The rotor core 102 is radially inward, ie to the axis of rotation 103 through, through a rotor core inner surface 118 Bound like the rotor core outer surface 109 also circular cylindrical and rotationally symmetrical to the axis of rotation 103 is formed and has a seventh diameter D7. With the rotor core inner surface 118 closes the rotor core 102 positive and / or positive fit to a rotation axis 103 rotationally symmetrical centrally arranged rotor shaft on; the latter is preferably formed with non-magnetic material, but not explicitly shown in the drawing.

The first and second recesses 106 . 107 have radially inwardly directed ends 119 respectively. 120 on, from the rotor core inner surface 118 only by an at least nearly annular inner rotor core support area 121 are spaced, extending in the circumferential direction 104 of the rotor core 102 along the rotor core inner surface 118 extends. The radial position of the radially inwardly directed ends 119 . 120 the first and second recess 106 . 107 is described by a sixth diameter D6. The inner rotor core support area 121 points in the radial direction of the rotor core 102 a radial dimension denoted by D9, which results as half of the difference of the sixth diameter D6 and the seventh diameter D7 and which is also dimensioned as small as when taking into account in the rotor core 102 occurring mechanical loads is possible.

The third and fourth recesses 110 . 111 have in contrast radially inwardly directed ends 122 respectively. 123 on, from the rotor core inner surface 118 more than just the inner rotor core support area 121 are spaced. The radial position of the radially inwardly directed ends 122 respectively. 123 the third and fourth recess 110 . 111 is described by a third diameter D3. The difference between the second diameter D2 and the sixth diameter D6 is preferably at least almost twice the difference between the second diameter D2 and the third diameter D3, with a deviation of about 5%, a maximum of 10%. In other words, the first and the second recess 106 . 107 in the radial direction or in its extension along the legs of the first "V" -shaped design 108 a larger, preferably at least almost twice the dimension as the third and the fourth recess 110 . 111 in the radial direction or in its extension along the legs of the second "V" -shaped design 112 , This is in the rotor core 102 between the first and second recesses 106 . 107 and the third and the sixth diameter D3, D6 a space area 124 formed with rotor core material whose design is explained in more detail below.

• • für die erste und die zweite Ausnehmung 106, 107, dass die Differenz D2 – D6 wenigstens das Fünffache einer als erste Abmessung bezeichneten Abmessung A1 der ersten und zweiten Ausnehmung 106, 107 quer zu den Schenkeln der ersten "V"-förmigen Gestaltung 108 beträgt, und
• • für die dritte und die vierte Ausnehmung 110, 111, dass die Differenz D2 – D3 wenigstens das Dreifache einer als zweite Abmessung bezeichneten Abmessung A2 der dritten und vierten Ausnehmung 110, 111 quer zu den Schenkeln der zweiten "V"-förmigen Gestaltung 112 beträgt.

In the example illustrated rotor core 102 have the recesses 106 . 107 . 110 . 111 in an extension along the legs of the "V" -shaped designs 108 . 112 ie between the radially inwardly directed ends 119 . 120 . 122 respectively. 123 on the one hand and the radially outwardly directed ends 113 . 114 . 115 respectively. 116 on the other hand, a dimension which is preferably several times larger than in an extension transverse to the legs of the "V" -shaped designs 108 . 112 , Again circumscribed by the radial extensions of the recesses 106 . 107 . 110 . 111 , ie by the difference D2 - D3 between the second D2 and third D3 diameter or by the difference D2 - D6 between the second D2 and sixth D6 diameter, applies specifically

• • for the first and the second recess 106 . 107 in that the difference D2 - D6 is at least five times a dimension A1 of the first and second recesses designated as the first dimension 106 . 107 across the thighs of the first "V" shaped design 108 is, and
• • for the third and the fourth recess 110 . 111 in that the difference D2 - D3 is at least three times a dimension A2 of the third and fourth recesses designated as the second dimension 110 . 111 transverse to the thighs of the second "V" shaped design 112 is.

In addition, in the illustrated example, the first dimension A1 is preferably at least almost 10% larger than the second dimension A2.

Further, an opening angle W4 of the legs, that is, the third and fourth recess 110 . 111 , the second "V" -shaped design 112 larger, preferably at least almost 20% larger than an opening angle W3 of the legs, ie the first and second recesses 106 . 107 , the first "V" -shaped design 108 ,

The first, second, third and fourth recesses 106 . 107 . 110 respectively. 111 are provided for receiving a first, second, third and fourth permanent magnet. This is in 3 based on the first recess 106 in which the first permanent magnet 125 is arranged, as well as the fourth recess 111 in which the fourth permanent magnet 126 is arranged, indicated. Here are the first 125 and the second permanent magnet is made identical; as are the third and the fourth 126 Permanent magnet identically formed. In the example shown are the permanent magnets 125 . 126 designed in one piece cuboid with rounded edges and corners, but instead several, preferably also cuboid, permanent magnets in each one of the recesses 106 . 107 . 110 respectively. 111 be provided. In a rotor constructed with several axially successively arranged segments 100 in which the magnetic poles are segment-by-segment by a predetermined helix angle in the circumferential direction 104 offset from each other, ie, twisted, are arranged, the individual permanent magnets extend in the axial direction only a maximum of one segment; otherwise, an extension of each of the permanent magnets is over at least substantially the entire axial dimension of the rotor 100 or the rotor core 102 possible.

The permanent magnets - including the exemplified first and fourth permanent magnet 125 . 126 according to 3 - In the inventively constructed rotor 100 are formed with ferrite material, preferably made entirely of ferrite material. This allows a cost-effective production of the rotor. Furthermore, in particular, a magnetization direction of the permanent magnets - that is, also of the first and fourth permanent magnets exemplified 125 . 126 according to 3 - At least largely, preferably at least almost completely, along the smaller dimension A1, A2 of the recesses 106 . 107 respectively. 110 . 111 aligned, so transversely to the legs of the "V" -shaped designs 108 . 112 ,

In this case, the magnetization direction of the permanent magnets - including the example of the first and fourth permanent magnets shown 125 . 126 according to 3 - alternately from one of the magnetic poles of the rotor 100 in the circumferential direction 104 next to the magnetic poles from the polar axis 105 of the relevant magnetic pole pointing the way and to the polar axis 105 the relevant magnetic pole pointing. As a result, the magnetic poles of the rotor are 100 at least almost in the polar axis 105 , and along the circumferential direction 104 alternating magnetic north poles and south poles.

In the illustrated embodiment, the permanent magnets extend 125 . 126 not completely on the relevant recesses 106 . 107 . 110 respectively. 111 , Only the first and second recess 106 . 107 become at the radially inwardly directed ends 119 . 120 at least almost completely filled by the first and second permanent magnets. At the radially outward ends 113 . 114 the first and second recess 106 . 107 and at the radially inwardly and radially outwardly directed ends 122 . 123 and 115 . 116 the third and fourth recess 110 respectively. 111 is ever an air pocket 127 . 128 such as 129 . 130 and 131 . 132 intended. The air pockets are advantageous 127 . 128 such as 129 . 130 and 131 . 132 formed by the fact that the ends 113 . 114 . 115 . 116 . 122 respectively. 123 the recesses 106 . 107 . 110 respectively. 111 pointed or obtuse - that is not perpendicular - to the extension of the recesses 106 . 107 . 110 respectively. 111 along the legs of the "V" -shaped designs 108 respectively. 112 aligned, whereas the permanent magnets 125 . 126 have mutually perpendicular surfaces. For example, the radially inward end 122 the third recess 110 at an obtuse angle to the direction along the through the third recess 110 formed leg of the second "V" -shaped design 112 aligned; relative to the right angle formed by the rectangular surfaces of the third permanent magnet right angle W6 thus leaves the space for the air pocket 129 , By contrast, for example, the radially inwardly directed end 120 the second recess 107 at a right angle W5 to the direction along the through the second recess 107 formed leg of the first "V" -shaped design 108 aligned so that no air pocket is formed here.

The air pockets prevent in the above-described direction of magnetization of the permanent magnets a magnetic short circuit or magnetic leakage flux at said ends 113 . 114 . 115 . 116 . 122 and 123 ,

The suppression of stray magnetic fluxes also serves that the radially inwardly directed ends 122 . 123 the third and fourth recess 110 . 111 are as close as possible to each other; they are only by a first support bridge 133 made of rotor core material, which serves to absorb centrifugal forces and whose width T1 is chosen as narrow as possible for a fulfillment of this purpose, separated from each other.

Instead of directly to the first 125 and second permanent magnet subsequent air pockets are in the illustrated embodiment between the radially inwardly directed ends 119 . 120 the first and second recess 106 . 107 two along the circumferential direction 104 of the rotor core 102 extending, magnetically non-conductive, quadrangular, flux-guiding recesses 134 . 135 arranged. The flow-directing recesses 134 . 135 , preferably forming air-filled cavities, are between the radially inwardly directed ends 119 . 120 the first 106 and second 107 Recess along the circumferential direction 104 strung together and through with the rotor core 102 integrally formed from rotor core material support webs 136 . 137 . 138 separated from each other. In detail, closes along the circumferential direction 104 to the first recess 106 a first 134 the flow-directing recesses 134 . 135 on, separated by a second 136 the support bars 136 . 137 . 138 , At the first 134 the flow-directing recesses 134 . 135 closes in the circumferential direction 104 a second 135 the flow-directing recesses 134 . 135 on, separated by a third 137 the support bars 136 . 137 . 138 , To the second 135 the flow-directing recesses 134 . 135 closes in the circumferential direction 104 the second recess 107 on, separated by a fourth 138 the support bars 136 . 137 . 138 , Radially inward are the flux steering recesses 134 . 135 completed by boundaries that extend along the sixth diameter D6. Radially outward are the flux-guiding recesses 134 . 135 completed by boundaries that extend along a fifth diameter D5.

The fifth diameter D5 is greater than the sixth diameter D6, but less than the third diameter D3 and chosen to be as small as possible, so that through the flux-guiding recesses 134 . 135 on the one hand leakage flux at the radially inwardly directed ends 119 . 120 the first and second recess 106 . 107 Effectively suppressed, for torque generation on the rotor 100 to be used magnetic rivers but not or as little disturbed. Preferably, the fifth diameter D5 is selected to be at most 8% to 10% larger than the sixth diameter D6. In addition, the second, third and fourth support bridge are also 136 . 137 . 138 with the rotor core 102 formed integrally from rotor core material and serve to absorb centrifugal forces. Also, the width T3 of the third support bridge 137 and the width T2 of the second and fourth support webs 136 respectively. 138 is chosen as narrow as it is possible for a fulfillment of this purpose.

In the illustrated embodiment, all corners of all recesses are also 106 . 107 . 110 . 111 . 134 and 135 rounded with a radius R1. Advantageously, this radius R1 for all corners of all recesses 106 . 107 . 110 . 111 . 134 and 135 identical. The fillets serve, among other things, a more even distribution of mechanical stresses in the rotor core 102 ,

Furthermore, the first recess extends 106 to a first of the magnetic poles of the rotor 100 at least nearly parallel to the one in the circumferential direction 104 immediately adjacent second recess 107 one in the circumferential direction 104 to the first of the magnetic poles of the rotor 100 immediately adjacent second of the magnetic poles of the rotor 100 , Between the first recess 106 to the first of the magnetic poles of the rotor 100 and in the circumferential direction 104 immediately adjacent second recess 107 the second of the magnetic poles of the rotor 100 is thus in the rotor core 102 a radially aligned strip of rotor core material having one in the circumferential direction 104 dimensioned width, which is designed at least substantially constant along the radial direction. This is in this strip over the entire radial extent of the rotor core 102 At least created almost homogeneous conditions for the magnetic flux, whose lines of force from the first permanent magnet 125 in the first recess 106 to the first of the magnetic poles of the rotor 100 to the second permanent magnet in the circumferential direction 104 immediately adjacent second recess 107 the second of the magnetic poles of the rotor 100 extend. Accordingly, the pole angle W1 between each two adjacent magnetic poles of the rotor 100 or their pole axes 105 and the opening angle W3 of the legs, ie the first and the second recess 106 . 107 , the first "V" -shaped design 108 at least nearly agree.

In the room area 124 between the first 106 and the second 107 Recess, in particular between sections of the first 106 and the second 107 Recess near the radially inwardly directed ends 119 respectively. 120 the first 106 and the second 107 Recess, is in the rotor core 102 at least one recess 139 arranged for receiving at least one fastening means. The at least one fastening means is preferably formed with a screw connection, a rivet or the like. The recess 139 is along a to the axis of rotation 103 arranged concentric circle with a fourth diameter D4; the fourth diameter D4 determines the radial position of the recess 139 for the at least one fastening means. In the circumferential direction 104 is the location of the recess 139 for that at least a fastening means by an angle W2 determines the angular position of the recess 139 for the at least one attachment means relative to the pole axis 105 indicates. For each of the magnetic poles of the rotor 100 is a recess 139 provided for the at least one fastening means, so that the recesses 139 two in the circumferential direction 104 adjacent magnetic poles in this circumferential direction 104 are rotated by the pole angle W1 against each other.

The recess 139 for the at least one fastening means is formed in the illustrated example by a circular bore having a diameter D10, which is determined by the nature and dimensions of the at least one fastening means. Opposite the third diameter D3 and thus the radially inwardly directed ends 122 . 134 the third and fourth recess 110 . 111 is the recess 139 for the at least one fastener spaced by a third dimension A3. Compared to the fifth diameter D5 and thus the radially outward boundaries of the flux-guiding recesses 134 . 135 is the recess 139 for the at least one fastener spaced by a fourth dimension A4. The dimensions A3 and A4 are preferably selected identically.

In a structure of the rotor 100 with two or more, axially juxtaposed segments varies the angle W2, ie the angular position of the recess 139 for the at least one attachment means relative to the pole axis 105 , from segment to segment to the desired helix angle, so that in the rotor 100 all recesses 139 for the at least one attachment means of axially one behind the other magnetic poles of the rotor 100 aligned. This can be very straightforward, the at least one fastener straight through the entire axial extent of the rotor 100 be guided.

A preferred dimensioning example of the rotor core 102 for the rotor according to the invention 100 returns the following table.

• • erste und zweite Ausnehmung in sich zur Rotorkernaußenfläche hin öffnender erster (108) und dritte und vierte Ausnehmung in sich zur Rotorkernaußenfläche hin öffnender zweiter "V"-förmiger Gestaltung zueinander angeordnet sind,
• • sich die zweite "V"-förmige Gestaltung zwischen den Ausnehmungen der ersten "V"-förmigen Gestaltung, mit dieser ineinander verschachtelt, befindet,
• • die Dauermagnete mit Ferritwerkstoff, vorzugsweise vollständig, gebildet sind,
• • insbesondere die Ausnehmungen entlang der Schenkel der "V"-förmigen Gestaltungen größer sind, bevorzugt mehrfach, besonders bevorzugt wenigstens dreifach, als quer dazu,
• • weiter insbesondere die Dauermagnete wenigstens weitgehend, bevorzugt wenigstens nahezu vollständig, entlang der geringeren Abmessung der Ausnehmungen magnetisiert sind.

In summary, the invention provides a rotor of an IPM machine with a magnetically conductive rotor core, which includes a first, second, third and fourth recess for reducing the manufacturing cost while maintaining power and torque to each magnetic pole of the rotor, in which at least a first, second, fourth, third or fourth permanent magnet is arranged, wherein

• First and second recesses in a first opening to the rotor core outer surface (FIG. 108 ) and third and fourth recesses are arranged in relation to one another to the rotor core outer surface opening second "V" -shaped design to each other,
• The second "V" -shaped configuration is interleaved with the recesses of the first "V" -shaped configuration,
• The permanent magnets are formed with ferrite material, preferably completely,
• In particular the recesses along the legs of the "V" -shaped designs are larger, preferably several times, more preferably at least three times, than transversely thereto,
• • Furthermore, in particular the permanent magnets at least largely, preferably at least almost completely, are magnetized along the smaller dimension of the recesses.

LIST OF REFERENCE NUMBERS

100

rotor

101

Rotor sheet section as rotor core element of 102

102

Rotor core of 100

103

Rotation axis of 100

104

Circumferential direction of 100 and 102

105

Pole axes of the magnetic poles of 100

106

First recess in 101 respectively. 102

107

Second recess in 101 respectively. 102

108

First "V" -shaped design includes 106 . 107

109

Rotor core outer surface: radially outward boundary of 102

110

Third recess in 101 respectively. 102

111

Fourth recess in 101 respectively. 102

112

Second "V" shaped design includes 110 . 111

113

Radially outward end of 106

114

Radially outward end of 107

115

Radially outward end of 110

116

Radially outward end of 111

117

Outer rotor core support area of 101 respectively. 102

118

Rotor core inner surface of 102

119

Radially inward end of 106

120

Radially inward end of 107

121

Inner rotor core support area of 101 respectively. 102

122

Radially inward end of 110

123

Radially inward end of 111

124

Space area with rotor core material between 106 . 107 as well as D3, D6

125

First permanent magnet in 106

126

Fourth permanent magnet in 111

127

Air bag on 113 from 106

128

Air bag on 114 from 107

129

Air bag on 122 from 110

130

Air bag on 123 from 111

131

Air bag on 115 from 110

132

Air bag on 116 from 111

133

First supporting bridge between 122 from 110 and 123 from 111

134

First flow-directing recess in 101 respectively. 102

135

Second flow-directing recess in 101 respectively. 102

136

Second support bridge between 106 and 134

137

Third support bridge between 134 and 135

138

Fourth carrying bridge between 135 and 107

139

Recess for fastening means, e.g. Screw connection, rivet

A1

First dimension: dimension of 106 . 107 across the thighs of 108

A2

Second dimension: dimension of 110 . 111 across the thighs of 112

A3

Third dimension: distance from 139 opposite D3

A4

Fourth dimension: distance from 139 opposite D5

D1

First diameter: diameter of 102 and thus 100 at 109

D2

Second diameter: radial position of 113 . 114 . 115 116

D3

Third Diameter: Radial location of 122 . 123

D4

Fourth diameter: radial position of 139

D5

Fifth diameter: radial position of the radially outward edges of 134 . 135

D6

Sixth diameter: radial position of 119 . 120

D7

Seventh diameter: diameter of 118

D8

Radial dimension of 117 in the radial direction of 101 respectively. 102

D9

Radial dimension of 121 in the radial direction of 101 respectively. 102

D10

diameter of 139

R1

Radius of the fillets of the corners of 106 . 107 . 110 . 111 . 134 . 135

T1

Width of 133

T2

Width of 136 and 138

T3

Width of 137

W1

Pole angle between each two adjacent magnetic poles or their polar axes 105

W2

Angular position of 139 across from 105

W3

Opening angle of the legs, ie 106 . 107 , from 108

W4

Opening angle of the legs, ie 110 . 111 , from 112

W5

Right angle of 120 to 107

W6

Right angle of the second permanent magnet 122 in 110

Z

Extract from 1 : Detail view after 2 and 3

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102014102411 A1 [0002, 0003, 0005]
• DE 102010002786 A1 [0006]

Claims (10)

Rotor ( 100 ) of a permanent magnet excited electric machine with a magnetically conductive rotor core ( 102 ) connected to each magnetic pole of the rotor ( 100 ) comprises: a first recess ( 106 ), in which at least one first permanent magnet ( 125 ), a second recess ( 107 ), in which at least one second permanent magnet is arranged, • a third recess ( 110 ), in which at least a third permanent magnet is arranged, • a fourth recess ( 111 ), in which at least a fourth permanent magnet ( 126 ), wherein • the first and second recesses ( 106 . 107 ) in the rotor core outer surface ( 109 ) opening first "V" -shaped design ( 108 ) and • the third and fourth recesses ( 110 . 111 ) in the rotor core outer surface ( 109 ) opening second "V" -shaped design ( 112 ) are arranged to each other, • first and second "V" -shaped design ( 108 ; 112 ) are interleaved in such a way that the second "V" -shaped configuration ( 112 ) between the recesses ( 106 . 107 ) of the first "V" -shaped design ( 108 ), • the permanent magnets ( 125 . 126 ) formed with ferrite material, preferably formed entirely of ferrite material, are, in particular the recesses ( 106 . 107 . 110 . 111 ) in an extension along the legs of the "V" -shaped designs ( 108 . 112 ) have a larger, preferably several times greater dimension than in an extension transverse to the legs of the "V" -shaped designs ( 108 . 112 ), more preferably at least three times the dimension, • furthermore in particular a magnetization direction of the permanent magnets ( 125 . 126 ) at least substantially, preferably at least almost completely, along the smaller dimension of the recesses ( 106 . 107 . 110 . 111 ) is aligned. Rotor ( 100 ) according to claim 1, characterized in that • radially inwardly directed ends ( 119 . 120 ) of the first and second recesses ( 106 . 107 ) from a rotor core inner surface ( 118 ) only by a radial dimension (D9) of an at least nearly annular inner rotor core support region (D9) 121 ) extending in the circumferential direction ( 104 ) of the rotor core ( 102 ) along the rotor core inner surface ( 118 ), are spaced and / or • radially outwardly directed ends ( 113 . 114 . 115 . 116 ) of the first, second, third and fourth recesses ( 106 . 107 . 110 . 111 ) from the rotor core outer surface ( 109 ) only by a radial dimension (D8) of an at least nearly annular outer rotor core support region (D8) 117 ) extending in the circumferential direction ( 104 ) of the rotor core ( 102 ) along the rotor core outer surface ( 109 ), are spaced apart. Rotor ( 100 ) according to claim 1 or 2, characterized in that the at least one permanent magnet ( 125 . 126 ) at least almost completely over the respective recesses ( 106 . 107 . 110 . 111 ), the relevant recesses ( 106 . 107 . 110 . 111 ) at least almost completely filling; optionally, that at least one of the recesses ( 106 . 107 . 110 . 111 ) at a radially inwardly and / or at a radially outwardly directed end ( 113 . 114 . 115 . 116 . 119 . 120 . 122 . 123 ) at least one air pocket ( 127 . 128 . 129 . 130 . 131 . 132 ) having. Rotor ( 100 ) according to one or more of the preceding claims, characterized in that • the first and the second recess ( 106 . 107 ) in an extension along the legs of the first "V" shaped configuration ( 108 ) have a larger, preferably at least almost double, dimension than the third and the fourth recess ( 110 . 111 ) along the legs of the second "V" shaped configuration ( 112 ) and / or • the first and the second recess ( 106 . 107 ) in an extension transverse to the legs of the first "V" shaped configuration ( 108 ) have a larger, preferably at least approximately 10% larger, dimension (A1) than the third and the fourth recess (FIG. 110 . 111 ) across the legs of the second "V" shaped configuration ( 112 ) and or An opening angle (W4) of the legs of the second "V" shaped configuration ( 112 ) larger, preferably at least almost 20% larger, than an opening angle (W3) of the legs of the first "V" -shaped configuration (FIG. 108 ). Rotor ( 100 ) according to one or more of the preceding claims, characterized in that the first recess ( 106 ) to a first of the magnetic poles of the rotor ( 100 ) at least nearly parallel to the one in the circumferential direction ( 104 ) immediately adjacent second recess ( 107 ) one in the circumferential direction ( 104 ) to the first of the magnetic poles of the rotor ( 100 ) immediately adjacent second of the magnetic poles of the rotor ( 100 ). Rotor ( 100 ) according to one or more of the preceding claims, characterized in that • at least one magnetically non-conductive, preferably quadrangular, flux-guiding recess ( 134 . 135 ) along the circumferential direction ( 104 ) of the rotor core ( 102 ) between radially inwardly directed ends ( 119 . 120 ) of the first and second recesses ( 106 . 107 ), in particular a plurality of such magnetically non-conductive, preferably quadrangular, flux-guiding recesses (US Pat. 134 . 135 ) between the radially inwardly directed ends ( 119 . 120 ) of the first and second recesses ( 106 . 107 ) preferably along the circumferential direction ( 104 ) and through, preferably with the rotor core ( 102 ) integrally formed of rotor core material, supporting webs ( 136 . 137 . 138 ) are separated from each other. Rotor ( 100 ) according to one or more of the preceding claims, characterized in that in a spatial area ( 124 ) between the first and the second recess ( 106 . 107 ), in particular between radially inwardly directed ends ( 119 . 120 ) of the first and second recesses ( 106 . 107 ), in the rotor core ( 102 ) at least one recess ( 139 ) is arranged for receiving at least one fastening means. Rotor core element ( 101 ), in particular rotor laminations ( 101 ), characterized by a design with the characteristics of a rotor ( 100 ) according to one or more of the preceding claims. Permanent magnet excited electric machine, characterized by a rotor ( 100 ) according to one or more of claims 1 to 7 and / or a rotor core element ( 101 ), in particular rotor laminations ( 101 ), according to claim 8. Vehicle, in particular road vehicle, characterized by a permanent magnet-excited electric machine according to claim 9 and / or a machine with a rotor ( 100 ) according to one or more of claims 1 to 7 and / or a machine having a rotor core element ( 101 ), in particular rotor laminations ( 101 ), according to claim 8.

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