WO2019174315A1

WO2019174315A1 - Rotor structure, permanent magnet assisted synchronous reluctance motor, and electric car

Info

Publication number: WO2019174315A1
Application number: PCT/CN2018/119791
Authority: WO
Inventors: 廖克亮; 胡余生; 陈彬; 卢素华
Original assignee: 珠海格力电器股份有限公司
Priority date: 2018-03-16
Filing date: 2018-12-07
Publication date: 2019-09-19
Also published as: CN108321953A; CN108321953B

Abstract

A rotor structure, a permanent magnet assisted synchronous reluctance motor, and an electric car. The rotor structure comprises a rotor body (10), which is provided with a permanent magnet slot group, comprising an inner permanent magnet slot (11). The rotor body (10) is further provided with a first bent slot (21) and a second bent slot (22). The first bent slot (21) is in communication with a first end of the inner permanent magnet slot (11), the geometric center line in the length direction of the first bent slot (21) and the geometric center line in the length direction of the first end of the inner permanent magnet slot (11) having a first angle. The second bent slot (22) is in communication with a second end of the inner permanent magnet slot (11), the geometric center line in the length direction of the second bent slot (22) and the geometric center line in the length direction of the second end of the inner permanent magnet slot (11) having a second angle. The first angle and the second angle are of unequal values. Making the values of the first angle and the second angle unequal can optimize the magnetic circuit of the rotor structure, thus increasing the torque of the rotor structure, reducing the effects of torque ripple, raising the resistance of the motor to demagnetization, and improving the efficiency of the motor.

Description

Rotor structure, permanent magnet auxiliary synchronous reluctance motor and electric vehicle

Technical field

The present invention relates to the field of electrical equipment, and in particular to a rotor structure, a permanent magnet assisted synchronous reluctance motor, and an electric vehicle.

Background technique

The torque output from the motor is not a constant value, but is a regular sinusoidal change as the rotor rotates within the stator. The ratio of the peak-to-peak value of the torque output waveform to the average value is called torque ripple. The larger the torque ripple, the more uneven the motor output, and the greater the vibration and noise. Therefore, the magnitude of torque ripple is one of the important parameters to measure the quality of the motor.

The permanent magnet reluctance motor is a new type of motor. It has been widely used in modern production and life because it can make full use of permanent magnet torque and reluctance torque. For permanent magnet motors, the risk of demagnetization is a major problem that restricts the application of permanent magnet motors. For motors to be more suitable for more complex applications, the motor needs to have stronger anti-demagnetization capability. The motor of the prior art has a problem of high demagnetization strength and low motor efficiency.

Summary of the invention

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a rotor structure, a permanent magnet assisted synchronous reluctance motor, and an electric vehicle to solve the problem of low efficiency of the prior art motor.

In order to achieve the above object, according to an aspect of the invention, a rotor structure is provided, comprising: a rotor body having a magnetic steel groove group formed on the rotor body, the magnetic steel groove group including an inner magnetic steel groove, and the rotor body further open a first folding groove and a second folding groove, wherein the first folding groove communicates with the first end of the inner magnetic steel groove, the geometric center line of the longitudinal direction of the first folding groove and the first end of the inner magnetic steel groove The geometric center line in the longitudinal direction has a first angle, the second hinge groove communicates with the second end of the inner magnetic steel groove, and the geometric center line of the longitudinal direction of the second folding groove and the second end of the inner magnetic steel groove The geometric centerline in the length direction has a second angle, wherein the first angle is not equal to the second angle.

Further, the first end of the inner magnetic steel groove extends outward in the radial direction of the rotor body, and the second end of the inner magnetic steel groove extends outward in the radial direction of the rotor body, and the inner magnetic steel groove a central portion is convexly disposed toward a center of the rotor body, the first end of the first folded groove is in communication with the first end of the inner magnetic steel groove, and the second end of the first folded groove extends toward the outer edge of the rotor body and Gradually away from the straight axis of the rotor body.

Further, the first end of the second folding groove communicates with the second end of the inner magnetic steel groove, and the second end of the second folding groove extends toward the outer edge of the rotor body and is gradually disposed away from the straight axis.

Further, the inner magnetic steel grooves are symmetrically disposed about the straight axis of the rotor body.

Further, the rotor body is formed by laminating a plurality of rotor punches having a front surface and a reverse surface, and a front surface of one of the adjacent two rotor punching sheets is disposed opposite to a reverse surface of the other rotor punching sheet.

Further, the magnetic steel trough group further comprises: an outer magnetic steel trough, the outer magnetic steel trough is disposed adjacent to the inner magnetic steel trough, and a magnetic conductive channel is formed between the outer magnetic steel trough and the inner magnetic steel trough, A first end of the outer magnetic steel groove extends outwardly in a radial direction of the rotor body, and a second end of the outer magnetic steel groove extends outward in a radial direction of the rotor body.

Further, the outer magnetic steel groove is generally V-shaped, curved or U-shaped.

Further, the central portion of the outer magnetic steel groove is convexly disposed toward the center of the rotor body.

Further, a third folding groove and a fourth folding groove are further formed on the rotor body, the third folding groove is in communication with the first end of the outer magnetic steel groove, and the second end of the fourth folding groove and the outer magnetic steel groove Connected.

Further, the geometric center line of the longitudinal direction of the third folding groove has a third angle with the geometric center line of the longitudinal direction of the first end of the outer magnetic steel groove, and the geometric center line and the outer length of the fourth folding groove The geometric center line of the second end of the layer magnetic steel groove has a fourth angle, wherein the third angle is not equal to the fourth angle.

Further, the first end of the third folded groove is in communication with the first end of the outer magnetic steel groove, and the second end of the third folded groove is extended toward the outer edge of the rotor body and is gradually disposed away from the straight axis of the rotor body, fourth The first end of the folded groove communicates with the second end of the outer magnetic steel groove, and the second end of the fourth folded groove extends toward the outer edge of the rotor body and is gradually disposed away from the straight axis.

further,

Wherein α1 is a central angle formed between a midpoint of a sidewall of the second end of the third folded groove adjacent to the outer edge of the rotor body and a line between the center of the rotor body and the straight axis; α2 is the first hinge groove a central angle formed between a midpoint of the sidewall of the second end adjacent to the outer edge of the rotor body and a line between the center of the rotor body and the straight axis; p is the number of pole pairs of the rotor structure; N _S is the number of teeth of the stator teeth ; N _C is the number of layers of the inner magnetic steel trough and the outer magnetic steel trough.

further,

Where α3 is the central angle formed between the midpoint of the sidewall of the second end of the fourth folded groove near the outer edge of the rotor body and the line at the center of the rotor body and the straight axis; α4 is the second hinge groove a central angle formed between a midpoint of the sidewall of the second end adjacent to the outer edge of the rotor body and a line between the center of the rotor body and the straight axis; p is the number of pole pairs of the rotor structure; N _S is the number of teeth of the stator teeth ; N _C is the number of layers of the inner magnetic steel trough and the outer magnetic steel trough.

further,

Wherein α1 is a central angle formed between a midpoint of a side wall of the second end of the third folded groove near the outer edge of the rotor body and a line connecting the center of the rotor body and the straight axis; α3 is a fourth hinge groove a central angle formed between a midpoint of the sidewall of the second end adjacent to the outer edge of the rotor body and a line between the center of the rotor body and the straight axis; p is the number of pole pairs of the rotor structure; N _S is the number of teeth of the stator teeth .

Further, at least one of the first folding groove, the second folding groove, the third folding groove and the fourth folding groove has a length L, and a radius of the rotor body is Dr, wherein L/Dr≤0.2.

Further, the first folding groove, the second folding groove, the third folding groove and the fourth folding groove have the same width, or the width of the first folding groove and the second folding groove, the third folding groove and the fourth folding groove At least one of the widths is different.

According to another aspect of the present invention, there is provided a permanent magnet assisted synchronous reluctance motor comprising a rotor structure which is the rotor structure described above.

According to another aspect of the present invention, an electric vehicle is provided comprising a rotor structure which is the rotor structure described above.

By applying the technical solution of the present invention, the first angle is set to be unequal to the second angle, and the magnetic circuit of the rotor structure can be effectively optimized, thereby increasing the torque of the rotor structure and reducing the rotational artery moment, thereby improving The anti-magnetic retraction capability of the motor improves the efficiency of the motor.

DRAWINGS

The accompanying drawings, which are incorporated in the claims of the claims In the drawing:

Figure 1 is a schematic view showing the structure of a first embodiment of a rotor structure according to the present invention;

Figure 2 is a schematic view showing the structure of a second embodiment of a rotor structure according to the present invention;

Figure 3 is a schematic view showing the structure of a third embodiment of a rotor structure according to the present invention;

Figure 4 is a schematic view showing the structure of a fourth embodiment of a rotor structure according to the present invention;

Figure 5 is a schematic view showing the structure of a fifth embodiment of a rotor structure according to the present invention;

Figure 6 is a schematic view showing the average torque of a rotor according to the present invention;

Figure 7 is a view showing the relationship between the anti-demagnetization ability and the off-angle of the rotor according to the present invention;

Figure 8 is a diagram showing torque waveforms generated by a forward stacked rotor die according to the present invention;

Figure 9 is a diagram showing torque waveforms generated by reverse stacked rotor blades in accordance with the present invention;

Fig. 10 is a view showing torque waveforms generated by a rotor chip stacked in forward and reverse directions according to the present invention.

Wherein, the above figures include the following reference numerals:

10. The rotor body;

11. Inner magnetic steel trough;

12. Outer magnetic steel trough;

21, a first folding groove; 22, a second folding groove; 23, a third folding groove; 24, a fourth folding groove;

30, stator; 31, stator teeth.

detailed description

It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments.

It is to be noted that the terminology used herein is for the purpose of describing particular embodiments, and is not intended to limit the exemplary embodiments. As used herein, the singular " " " " " " There are features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or order. It is to be understood that the terms so used are interchangeable as appropriate, such that the embodiments of the invention described herein can be implemented, for example, in a sequence other than those illustrated or described herein. In addition, the terms "comprises" and "comprises" and "the" and "the" are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to Those steps or units may include other steps or units not explicitly listed or inherent to such processes, methods, products or devices.

For convenience of description, spatially relative terms such as "above", "above", "on top", "above", etc., may be used herein to describe as in the drawings. The spatial positional relationship of one device or feature to other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation of the device described. For example, if the device in the figures is inverted, the device described as "above other devices or configurations" or "above other devices or configurations" will be positioned "below other devices or configurations" or "at Under other devices or configurations." Thus, the exemplary term "above" can include both "over" and "under". The device can also be positioned in other different ways (rotated 90 degrees or at other orientations) and the corresponding description of the space used herein is interpreted accordingly.

Exemplary embodiments in accordance with the present application will now be described in more detail with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. It is to be understood that the embodiments are provided so that this disclosure will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art, in which The thicknesses of the layers and regions are denoted by the same reference numerals, and the description thereof will be omitted.

Referring to Figures 1 through 10, in accordance with an embodiment of the present invention, a rotor structure is provided.

The rotor body 10 is provided with a magnetic steel groove group, and the magnetic steel groove group includes an inner magnetic steel groove 11. The first main groove 21 and the second folding groove 22 are further formed on the rotor body 10, and the first folding groove 21 is in communication with the first end of the inner magnetic steel groove 11, the geometric center line of the longitudinal direction of the first folding groove 21 has a first angle with the geometric center line of the longitudinal direction of the first end of the inner magnetic steel groove 11. The second folding groove 22 communicates with the second end of the inner magnetic steel groove 11, and the geometric center line of the longitudinal direction of the second folding groove 22 and the geometric center line of the second end of the inner magnetic steel groove 11 have a second angle, wherein the first angle is not equal to the second angle.

In the embodiment, the first angle is set to be unequal to the second angle, and the magnetic circuit of the rotor structure can be effectively optimized, thereby increasing the torque of the rotor structure and reducing the rotational artery moment, thereby improving the effect. The anti-magnetic retraction capability of the permanent magnet auxiliary synchronous reluctance motor (hereinafter referred to as the motor) improves the efficiency of the motor.

The first end of the inner magnetic steel groove 11 extends outward in the radial direction of the rotor body 10. The second end of the inner layer magnetic steel groove 11 extends outward in the radial direction of the rotor body 10. The central portion of the inner magnetic steel groove 11 is convexly disposed toward the center of the rotor body 10. The first end of the first folded groove 21 communicates with the first end of the inner layer magnetic steel groove 11. The second end of the first hinge groove 21 extends toward the outer edge of the rotor body 10 and is gradually disposed away from the straight axis d (shown in FIG. 2) of the rotor body 10. The first end of the second folded groove 22 communicates with the second end of the inner layer magnetic steel groove 11, and the second end of the second folded groove 22 extends toward the outer edge of the rotor body 10 and is gradually disposed away from the straight axis. Such a configuration can gradually increase the distance between the first and

second folding grooves

21 and 22 and the straight shaft, and can effectively increase the guiding effect of the first and

second folding grooves

21 and 22 on the magnetic field.

Preferably, the inner layer magnetic steel groove 11 is symmetrically disposed with respect to the straight axis of the rotor body 10. This setting can effectively increase the inductance on the straight axis.

As shown in FIGS. 8 to 9, the rotor body 10 is formed by laminating a plurality of rotor punches having a front surface and a reverse surface, and the front surface of one of the adjacent rotor blades is punched with the other rotor. The opposite side of the piece is set oppositely. The rotor of the motor is formed by stacking the rotor blades in a positive and negative order. Due to the asymmetry of the rotor punching structure, the torque waveform period and amplitude generated by the motor under each pole are also asymmetrical. The torque waveform generated by the forward stacked rotor blades is as shown by f in Fig. 8, and the torque waveform generated by the reversely stacked rotor blades is as shown by f1 in Fig. 9. The torque waveform obtained by the rotor made by reversing the rotor blanks should be the superposition of the waveforms of the two rotor punches, thereby weakening the cogging torque. The torque waveform of the rotor chip after the reverse stack is superimposed as shown by f2 in FIG. The rotor of the motor has a slotted shape, and the slot has a top turning structure and is asymmetrical left and right. The torque ripple is weakened by the positive and negative stacking of the rotor blades. The shape of the folded groove is not limited to the shape in the preferred embodiment, and is not limited to the equal-width structure, and a rectangular shape may be employed, and the two-arm magnetic steel groove and the bottom magnetic steel groove may have an arc structure.

The magnetic steel trough group also includes an outer magnetic steel trough 12. The outer magnetic steel groove 12 is disposed adjacent to the inner magnetic steel groove 11. A magnetic conductive path is formed between the outer magnetic steel groove 12 and the inner magnetic steel groove 11. The first end of the outer magnetic steel groove 12 extends outward in the radial direction of the rotor body 10. The second end of the outer magnetic steel groove 12 extends outward in the radial direction of the rotor body 10. This arrangement facilitates the magnetic conduction function of the magnetic conductive channel.

The outer magnetic steel groove 12 is generally V-shaped, curved or U-shaped. The central portion of the outer magnetic steel groove 12 is convexly disposed toward the center of the rotor body 10. This arrangement can effectively increase the magnetic permeability of the rotor structure, which in turn increases the torque of the rotor structure.

A third folding groove 23 and a fourth folding groove 24 are further defined in the rotor body 10. The third folding groove 23 communicates with the first end of the outer magnetic steel groove 12, and the fourth folding groove 24 and the outer magnetic steel groove 12 The second ends are connected. This arrangement can effectively increase the magnetic permeability of the rotor structure, which in turn increases the torque of the rotor structure.

The geometric center line of the third folded groove 23 in the longitudinal direction has a third angle with the geometric center line of the longitudinal direction of the first end of the outer magnetic steel groove 12. The geometric center line of the longitudinal direction of the fourth folding groove 24 has a fourth angle with the geometric center line of the longitudinal direction of the second end of the outer magnetic steel groove 12, wherein the third angle is not equal to the fourth angle. This arrangement can also effectively increase the torque of the rotor structure.

Specifically, the first end of the third folded groove 23 communicates with the first end of the outer magnetic steel groove 12. The second end of the third fold groove 23 extends toward the outer edge of the rotor body 10 and is gradually disposed away from the straight axis of the rotor body 10. The first end of the fourth folded groove 24 communicates with the second end of the outer magnetic steel groove 12. The second end of the fourth folded groove 24 extends toward the outer edge of the rotor body 10 and is gradually disposed away from the straight axis.

Preferably,

Wherein α1 is the central angle formed between the midpoint of the side wall of the second end of the third folded groove 23 near the outer edge of the rotor body 10 and the line between the center of the rotor body 10 and the straight axis, and α2 is the first a central angle formed between a midpoint of the second end of the folded groove 21 adjacent to the outer edge of the rotor body 10 and a line between the center of the rotor body 10 and the straight axis, p is the number of pole pairs of the rotor structure, N _S is the number of teeth of the stator teeth; N _C is the number of layers of the inner magnetic steel groove 11 and the outer magnetic steel groove 12. In the present embodiment, the magnetic field is formed by the stator teeth 31 of the stator 30 through the air gap and then through the rotor magnetic flux path, and the magnetic flux is maximized at the relative position of the magnetic flux path and the stator tooth portion, and the generated torque is also maximum. By changing the turning angle, the width and position of the magnetic flux path between each layer of magnetic steel are changed, and the position and size of the torque peak and the valley value are changed accordingly to change the torque waveform. By changing the turning angle, the demagnetizing magnetic field can be guided, so that the demagnetizing magnetic field does not act on the permanent magnet, and the influence of the demagnetizing magnetic field on the permanent magnet is reduced, thereby achieving the purpose of improving the anti-demagnetization capability.

further,

Wherein α3 is a central angle formed between a midpoint of the sidewall of the second end of the fourth folded groove 24 near the outer edge of the rotor body 10 and a line connecting the center of the rotor body 10 and the straight axis; α4 is the second a central angle formed between a midpoint of the second end of the folded groove 22 adjacent to the outer edge of the rotor body 10 and a line between the center of the rotor body 10 and the straight axis, p is the number of pole pairs of the rotor structure, N _S is the number of teeth of the stator teeth, and N _C is the number of layers of the inner magnetic steel groove 11 and the outer magnetic steel groove 12.

In this embodiment, no permanent magnets are disposed in the first folding groove 21, the second folding groove 22, the third folding groove 23, and the fourth folding groove 24. At least one of the first folding groove 21, the second folding groove 22, the third folding groove 23, and the fourth folding groove 24 has a length L, and the radius of the rotor body 10 is Dr, wherein L/Dr ≤ 0.2. This arrangement facilitates better routing of the flux lines.

In this embodiment, the rotor punching groove is asymmetrically left and right, and the top magnetic steel groove of each layer is uniformly offset to the left by about half a pitch, that is, the following relationship is satisfied:

Wherein α1 is the central angle formed between the midpoint of the side wall of the second end of the third folded groove 23 near the outer edge of the rotor body 10 and the line between the center of the rotor body 10 and the straight axis, and α3 is the fourth a central angle formed between a midpoint of the second end of the folded groove 24 adjacent to the outer edge of the rotor body 10 and a line between the center of the rotor body 10 and the straight axis, p is the pole number of the rotor structure, N _S is the number of teeth of the stator teeth.

Specifically, the widths of the first folding groove 21, the second folding groove 22, the third folding groove 23, and the fourth folding groove 24 are all the same, or the width of the first folding groove 21 is different from the second folding groove 22 and the third folding groove The width of at least one of the groove 23 and the fourth folding groove 24 is different. The relationship between the average torque of the rotor of the present invention and the anti-demagnetization ability of the rotor and the off angle can be referred to Figs. 6 and 7.

The rotor structure in the above embodiment can also be used in the field of electrical equipment technology, that is, in accordance with another aspect of the present invention, an electric machine is provided. The motor includes a rotor structure which is the rotor structure in the above embodiment.

The rotor structure in the above embodiment can also be used in the field of electric vehicle technology, that is, according to another aspect of the present invention, an electric vehicle is provided. The electric vehicle includes a rotor structure which is the rotor structure in the above embodiment.

As shown in Fig. 2, the motor has a rotor and a stator, and the number of poles is 2P. The stator has a cogging structure, and Ns stator teeth are evenly distributed under each pole. The rotor of the motor is formed by stacking rotor blades. Each rotor punching plate is provided with a plurality of magnetic steel grooves, and the magnetic steel grooves are used for placing permanent magnets, and the number of layers is Nc. The shape of the magnetic steel groove is approximately U-shaped, and can be divided into three parts: a top folding groove, a two-arm magnetic steel groove and a bottom magnetic steel groove. The top magnetic steel groove is designed to have a turning shape, the angle between the folding groove and the center line of the rotor, and the angle between the two-arm magnetic steel groove and the center line of the rotor are different. The angle between the line connecting the center point of the upper part of the groove to the center of the rotor and the center line of each pole of the rotor is the turning angle of the groove, and the turning angles of the left and right tops of each layer of the magnetic steel groove are α1, α2, α3, α4, respectively.

As shown in Fig. 3 to Fig. 5, the rotor of the motor is provided with a plurality of air grooves from the inside to the outside in the radial direction. The top of each layer of the air groove adopts a turning design, and the turning design can change the magnetic field of the rotor to avoid the demagnetizing magnetic field facing the permanent magnet. The motor is resistant to demagnetization. By adjusting the length L1 of the folding groove, the motor torque output can be ensured while improving the anti-demagnetization capability of the motor.

The turning angle of each pole of the motor rotor is asymmetrical to the left and right, and the obtained torque waveform under each pole is also asymmetrical. By laminating the rotor blanks in a positive and negative manner (positive and reverse stacking), a superposition of the torque waveform (positive stack) and its mirror waveform (reverse stack) per pole can be obtained. The peak value of the synthesized torque waveform obtained by superimposing the asymmetric torque waveform is smaller than the original waveform peak value, so the torque ripple of the motor can be significantly reduced in this embodiment. At the same time, the eddy current loss of the motor is reduced due to the reduction of the axial contact area between the rotor blades. The air groove turning can optimize the magnetic field distribution and improve the anti-demagnetization ability of the motor. Therefore, the motor adopting the technical solution has low torque ripple, strong anti-demagnetization capability and high efficiency.

In addition to the above, it should be noted that "one embodiment", "another embodiment", "an embodiment" and the like referred to in the specification refers to a specific feature, structure or structure described in connection with the embodiment. Features are included in at least one embodiment of the general description of the application. The appearance of the same expression in various places in the specification does not necessarily refer to the same embodiment. Further, when a particular feature, structure, or feature is described in conjunction with any embodiment, it is claimed that such features, structures, or characteristics are also included in the scope of the invention.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A rotor structure, comprising:

a rotor body (10), the rotor body (10) is provided with a magnetic steel groove group, the magnetic steel groove group comprises an inner magnetic steel groove (11), and the rotor body (10) is further provided with a first a folding groove (21) and a second folding groove (22), wherein the first folding groove (21) communicates with the first end of the inner magnetic steel groove (11), the first folding groove (21) a geometric center line in the longitudinal direction having a first angle with a geometric center line of a length direction of the first end of the inner layer magnetic steel groove (11), the second folding groove (22) and the inner layer magnetic The second end of the steel trough (11) is in communication, and the geometric center line of the longitudinal direction of the second chamfer (22) and the geometric center line of the length direction of the second end of the inner magnetic steel trough (11) have a second angle, wherein the first angle is not equal to the second angle.
The rotor structure according to claim 1, wherein a first end of said inner magnetic steel groove (11) extends outward in a radial direction of said rotor body (10), said inner layer magnetic A second end of the steel groove (11) extends outward in a radial direction of the rotor body (10), and a central portion of the inner magnetic steel groove (11) is convex toward a center of the rotor body (10) The first end of the first folding groove (21) is in communication with the first end of the inner magnetic steel groove (11), and the second end of the first folding groove (21) is oriented toward the ground. The outer edge of the rotor body (10) extends and is gradually disposed away from the straight axis of the rotor body (10).
The rotor structure according to claim 2, wherein the first end of the second folding groove (22) communicates with the second end of the inner magnetic steel groove (11), and the second folding A second end of the slot (22) extends toward the outer edge of the rotor body (10) and is progressively disposed away from the straight axis.
The rotor structure according to any one of claims 1 to 3, characterized in that the inner layer magnetic steel groove (11) is symmetrically arranged with respect to a straight axis of the rotor body (10).
The rotor structure according to any one of claims 1 to 3, characterized in that the rotor body (10) is formed by lamination of a plurality of rotor punches having front and back faces, adjacent to two The front side of one of the rotor blanks is disposed opposite the opposite side of the other of the rotor blades.
The rotor structure according to any one of claims 1 to 3, wherein the magnetic steel groove group further comprises:

An outer magnetic steel groove (12), the outer magnetic steel groove (12) is disposed adjacent to the inner magnetic steel groove (11), the outer magnetic steel groove (12) and the inner layer A magnetic conductive passage is formed between the magnetic steel grooves (11), and a first end of the outer magnetic steel groove (12) extends outward in a radial direction of the rotor body (10), the outer magnetic steel A second end of the slot (12) extends outwardly in a radial direction of the rotor body (10).
The rotor structure according to claim 6, wherein said outer magnetic steel groove (12) is entirely V-shaped, curved or U-shaped.
The rotor structure according to claim 6, characterized in that the central portion of the outer magnetic steel groove (12) is convexly disposed toward the center of the rotor body (10).
The rotor structure according to claim 6, wherein the rotor body (10) is further provided with a third folding groove (23) and a fourth folding groove (24), and the third folding groove (23) A first end of the outer magnetic steel trough (12) is in communication with the second end of the outer magnetic steel trough (12).
The rotor structure according to claim 9, characterized in that the geometric center line of the longitudinal direction of the third chamfer (23) and the longitudinal direction of the outer end of the outer magnetic steel groove (12) The center line has a third angle, and the geometric center line of the longitudinal direction of the fourth folding groove (24) has a fourth angle with the geometric center line of the length direction of the second end of the outer magnetic steel groove (12) Wherein the third angle is not equal to the fourth angle.
The rotor structure according to claim 9, wherein the first end of the third folding groove (23) communicates with the first end of the outer magnetic steel groove (12), and the third folding a second end of the slot (23) extending toward the outer edge of the rotor body (10) and gradually away from a straight axis of the rotor body (10), the first end of the fourth hinge groove (24) being The second ends of the outer magnetic steel grooves (12) are in communication, and the second ends of the fourth folded grooves (24) extend toward the outer edge of the rotor body (10) and are gradually disposed away from the straight axis.
The rotor structure according to claim 11 wherein:

Wherein α1 is the line connecting the midpoint of the side wall of the second end of the third folded groove (23) close to the outer edge of the rotor body (10) and the center of the rotor body (10) Describe the central angle formed between the straight axes;

Α2 is a line connecting the midpoint of the side wall of the second end of the first folded groove (21) close to the outer edge of the rotor body (10) to the center of the rotor body (10) and the straight a central angle formed between the axes;

p is the number of pole pairs of the rotor structure;

N S is the number of teeth of the stator teeth;

N C is the number of layers of the inner magnetic steel groove (11) and the outer magnetic steel groove (12).
The rotor structure according to claim 11 wherein:

among them,

Α3 is a line connecting the midpoint of the side wall of the second end of the fourth folded groove (24) close to the outer edge of the rotor body (10) to the center of the rotor body (10) and the straight a central angle formed between the axes;

Α4 is a line connecting the midpoint of the side wall of the second end of the second folded groove (22) close to the outer edge of the rotor body (10) to the center of the rotor body (10) and the straight a central angle formed between the axes;

p is the number of pole pairs of the rotor structure;

N S is the number of teeth of the stator teeth;

N C is the number of layers of the inner magnetic steel groove (11) and the outer magnetic steel groove (12).
The rotor structure according to claim 11 wherein:

Wherein α1 is the line connecting the midpoint of the side wall of the second end of the third folded groove (23) close to the outer edge of the rotor body (10) and the center of the rotor body (10) Describe the central angle formed between the straight axes;

Α3 is a line connecting the midpoint of the side wall of the second end of the fourth folded groove (24) close to the outer edge of the rotor body (10) to the center of the rotor body (10) and the straight a central angle formed between the axes;

p is the number of pole pairs of the rotor structure;

N S is the number of teeth of the stator teeth.
The rotor structure according to claim 11, wherein the first folding groove (21), the second folding groove (22), the third folding groove (23), and the fourth folding groove At least one of (24) has a length L, and a radius of the rotor body (10) is Dr, wherein L/Dr ≤ 0.2.
The rotor structure according to claim 11, wherein the first folding groove (21), the second folding groove (22), the third folding groove (23), and the fourth folding groove (24) having the same width, or the width of the first folding groove (21) and the second folding groove (22), the third folding groove (23) and the fourth folding groove (24) At least one of the widths of the ) is different.
A permanent magnet assisted synchronous reluctance machine comprising a rotor structure, characterized in that the rotor structure is the rotor structure according to any one of claims 1 to 16.
An electric vehicle comprising a rotor structure, characterized in that the rotor structure is the rotor structure according to any one of claims 1 to 16.