CN214756014U

CN214756014U - Electric machine

Info

Publication number: CN214756014U
Application number: CN202121071242.1U
Authority: CN
Inventors: 李金长
Original assignee: Sew Motor Suzhou Co ltd
Current assignee: Sew Motor Suzhou Co ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-11-16
Anticipated expiration: 2031-05-19

Abstract

The invention relates to an electric machine having a rotor shaft and a lamination stack, wherein the lamination stack is inserted on the rotor shaft, wherein the lamination stack has grooves spaced uniformly from one another in the circumferential direction for receiving short-circuit bars of a squirrel-cage armature, wherein the lamination stack has slit groups regularly spaced from one another in the circumferential direction with reference to the axis of rotation of the rotor shaft, wherein each slit group has at least three slits, wherein each slit is designed in the shape of a circular arc or elliptical arc, wherein the slits of the respective slit groups are oriented concentrically to one another.

Description

Electric machine

Technical Field

The utility model relates to a motor with rotor shaft and lamination stack.

Background

A single lamination of a rotor with a set of slots for forming reluctance poles is known from document EP 3788701 a 1.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is therefore to improve an electric machine having a rotor shaft and a lamination stack, wherein a simple operation should be possible.

According to the invention, this object is achieved by an electric machine having a rotor shaft and a lamination stack according to the features given below.

In connection with an electric machine having a rotor shaft and a lamination stack, the important feature of the invention is that the lamination stack is inserted onto the rotor shaft,

wherein the lamination stack, in particular on its radial outer periphery with reference to the rotational axis of the rotor shaft, has circumferentially evenly spaced grooves for receiving short-circuit bars of the squirrel-cage armature,

wherein the lamination stack, in particular for forming the magnetic reluctance poles, has groups of slots regularly spaced apart from one another in the circumferential direction with reference to the axis of rotation of the rotor shaft,

wherein each slit group is provided with at least three slits,

wherein each slit is designed in the shape of a circular arc or an elliptical arc,

wherein the slits in the same slit group are oriented concentrically to each other.

The advantage here is that the magnetic resistance can be constructed very simply. Because the embodiment of the invention through the groove enables an equalization of the magnetic resistance poles, a more uniform, i.e. more balanced, course of change of the torque can be achieved during the rotational movement.

In an advantageous embodiment, the number of slot groups is four. The advantage here is that the synchronized operation of the power grid can be achieved with little effort.

In an advantageous embodiment, each slit is delimited radially inwardly by a first circular arc and radially outwardly by a second circular arc, with reference to the center of a circle containing the respective circular arc or with reference to the center point of an ellipse or to the focus of an ellipse containing the respective elliptical arc. The advantage here is that a field distribution in the lamination stack which is as efficient as possible can be achieved.

In an advantageous embodiment, all circles of the circular arcs containing all slits have the same center point, or all ellipses of the elliptical arcs containing all slits have the same center point or focus of the ellipse, in particular, are arranged concentrically with respect to one another. The advantage here is that the magnetoresistive pole can be strongly formed.

In an advantageous embodiment, the radial extent of the respective slit is based on the center of the circle or on the center point or focus of the ellipse

Constant in the circumferential direction around the centre of the circle or around the centre point or focus of the ellipse, and/or

Independent of the circumferential angle around the center of the circle or around the center point or focus of the ellipse.

The advantage here is that an effective field guidance can be achieved.

In an advantageous embodiment, the radial extent of the respective slit with reference to the center of the circle, the center point of the ellipse or the focus of the ellipse increases with increasing radial distance from the center of the circle, the center point of the ellipse or the focus of the ellipse. The advantage here is that the field lines can be bunched and thus an efficient magnetoresistive pole can be formed.

In an advantageous embodiment, the radial distance between each two slits closest to one another in the same slit group with respect to the center of the circle, the center point of the ellipse or the focus of the ellipse increases with increasing distance from the center of the circle, the center point of the ellipse or the focus of the ellipse. The advantage here is that an effective field guidance can be achieved.

In an advantageous embodiment, the radial distance between each two slits closest to one another in the same slit group with reference to the center of the circle, the center point of the ellipse or the focus of the ellipse is independent of the distance from the center of the circle, the center point of the ellipse or the focus of the ellipse, i.e., in particular, the radial distance is constant. The advantage here is that an effective field guidance can be achieved.

In an advantageous embodiment, each slit is at a minimum distance from one of the grooves at its respective end arranged opposite or in the circumferential direction, wherein the value of the minimum distance is the same value, i.e. in particular the same, for all ends of all slits. The advantage here is that an effective field guidance can be achieved.

In one advantageous embodiment, the squirrel-cage armature and the lamination stack are designed as a composite part. The advantage here is that a cost-effective production can be achieved.

In one advantageous embodiment, the stator of the electric machine has a three-phase winding. The advantage here is that the electric machine can be operated as an asynchronous machine, but the electric machine can still be operated in a grid-synchronous manner due to the reluctance behavior of the electric machine produced by the reluctance poles.

In an advantageous embodiment, the slot groups are identical to one another, i.e. can be brought into register with one another, in particular by rotation about the axis of rotation of the rotor shaft. The advantage here is that a low-vibration and low-wave rotary operation can be achieved.

In an advantageous embodiment, the slot groups have the same radial distance from the axis of rotation of the rotor shaft. The advantage here is that quiet running in rotation can be achieved.

The present invention is not limited to the above-described combinations of features. The above-described combinations of features and/or individual features and/or other possibilities of reasonable combinations of features described below and/or of features shown in the drawings can be brought about by a person skilled in the art, in particular from the object set out and/or by comparison with the prior art.

Drawings

The invention will now be described in detail with reference to the schematic drawings:

fig. 1 shows an oblique view of a rotor of an electric machine according to the invention.

Fig. 2 shows an oblique view of the squirrel cage armature 2 of the rotor.

Fig. 3 shows an oblique view of the stator lamination 3.

Fig. 4 shows a plan view of the stator lamination 3.

List of reference numerals:

1 rotor shaft

2 squirrel-cage armature

3 laminated sheet group

40 slit

41 groove

Detailed Description

As shown in the drawing, the rotor of the electrical machine has a rotor shaft 1 which is inserted into a lamination stack 3, which is designed as a composite with a squirrel cage armature 2. The short-circuit rings of the squirrel-cage armature 2, which are arranged axially on both sides, are produced by overmoulding, in particular with aluminum and/or copper.

The short-circuit bars of the squirrel-cage armature, which connect the short-circuit rings, are likewise produced during the injection molding and fill the axially oriented grooves 41 of the lamination stack 3.

The lamination stack 3 is composed of a single lamination arranged in a stacked manner in the axial direction.

Each of the individual laminations is preferably designed as a stamping.

As shown in fig. 4, each individual lamination of the lamination stack has grooves 41 on its outer circumference, which are all arranged at the same radial distance relative to the axis of rotation of the rotor shaft 1 and are spaced evenly from one another in the circumferential direction.

Radially inside the groove 41, four slit groups are arranged, which are regularly spaced apart from one another in the circumferential direction and form four reluctance poles, so that a motor which operates on the principle of an asynchronous motor with a squirrel cage armature additionally has reluctance poles, so that a synchronous grid operation, in particular without slip, can be achieved.

Each slit group has three slits which are formed in a curved manner in the form of a circular segment, wherein the respective circles in which the individual slits in the respective slit group lie are oriented concentrically with respect to one another.

Each slit has a constant radial extension in a circumferential direction along a circle to which the respective slit corresponds, wherein the radial extension is referenced to a center of the corresponding circle.

However, the radial extension of the respective slits increases with increasing distance from the center of the circle. In the respective reluctance poles, therefore, a homogenization and/or equalization of the reluctance pole strength in the circumferential direction can be achieved.

The radial distance between two slits closest to each other in the radial direction in the respective slit group always has the same value, in particular independently of the distance from the center of the circle.

Each slot group has three slots arranged concentrically.

Each slit 40 is spaced on its end arranged opposite or in the circumferential direction, respectively, from a respective one of the grooves 41 by a minimum distance, wherein the value of the minimum distance is the same for all ends of all slits.

The stator of the electric machine preferably has a three-phase winding. Thus, a rotating magnetic field can be generated, which enables the motor to operate as a three-phase alternating current motor.

In other embodiments according to the present invention, each slit group includes more than three slits.

In other embodiments according to the invention, the value of the radial distance between two slits in a respective slit group that are closest to each other in the radial direction increases with increasing distance from the center of the circle. A further improved homogenization and/or equalization of the strength of the magnetic resistance poles in the circumferential direction can thus be achieved in the respective magnetic resistance poles.

In other embodiments according to the invention, the slit 40 is not designed in the described circular arc shape, but in an elliptical circular arc shape, wherein the center point of the respective ellipse is used instead of the center point of the respective circle. This improves the homogenization of the magnetoresistive pole strength with respect to the circumferential angle around the focal point of the ellipse, but does not result in a constant distance between the slits 40 along the arc course of the slits 40, but rather results in a varying distance.

In particular, a further improved homogenization and/or equalization can be achieved if the center of the circle is not used but the focus of the respective ellipse.

Claims

1. An electric machine having a rotor shaft and a lamination stack,

the lamination stack is inserted over the rotor shaft,

wherein the lamination stack has slots spaced uniformly apart from one another in the circumferential direction for receiving the short-circuit bars of the squirrel-cage armature,

it is characterized in that the preparation method is characterized in that,

the lamination stack has groups of slits regularly spaced from each other in the circumferential direction with reference to the rotational axis of the rotor shaft in order to form the reluctance poles,

wherein each slit group is provided with at least three slits,

2. An electric machine as claimed in claim 1, characterized in that the slots are located on the radial periphery of the lamination stack with reference to the axis of rotation of the rotor shaft.

3. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the number of sets of slits is four.

4. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

each slit being delimited radially on the inside by a first circular arc and radially on the outside by a second circular arc, with reference to the centre of a circle containing the respective circular arc,

alternatively, the first and second electrodes may be,

each slit is radially inwardly bounded by a first elliptical arc and radially outwardly bounded by a second elliptical arc, with reference to an ellipse center point or ellipse focus of an ellipse containing the respective elliptical arc.

5. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

all circles of the circular arc containing all slits have the same center point or all ellipses of the elliptical arc containing all slits have the same center point or focus of the ellipse, i.e. are arranged concentrically to each other.

6. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

radial extension of the respective slit with reference to the centre of the circle or with reference to the centre point or focus of the ellipse

7. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the radial extension of the respective slits with respect to the center of the circle increases with increasing radial distance from the center of the circle, or the radial extension of the respective slits with respect to the center point or focus of the ellipse increases with increasing radial distance from the center point or focus of the ellipse.

8. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the radial distance between every two slits closest to each other in the same slit group based on the center of the circle or the center point or the focus of the ellipse increases with increasing distance from the center of the circle or the center point or the focus of the ellipse.

9. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the radial distance between every two slits closest to each other in the same slit group, with reference to the center of the circle or to the center point or focus of the ellipse, is independent of the distance from the center of the circle or to the center point or focus of the ellipse, i.e. the radial distance is constant.

10. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

each slit is spaced at its respective end arranged opposite or in the circumferential direction from one of the grooves (41) by a minimum distance, wherein the value of the minimum distance is the same value, i.e. the same, for all ends of all slits.

11. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the squirrel cage armature and the lamination stack are designed as a composite.

12. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the stator of the motor has three-phase windings.

13. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the respective slit groups are designed to be identical to each other.

14. An electric machine as claimed in claim 13, characterized in that the respective groups of slits are designed to be able to coincide with each other by rotation about the axis of rotation of the rotor shaft.

15. The electric machine according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

each slit group has the same radial distance with respect to the rotation axis of the rotor shaft.