CN105245043A - Segmentation skewed-pole type permanent magnet synchronous motor rotor - Google Patents

Abstract

The invention aims to provide a segmentation skewed-pole type permanent magnet synchronous motor mainly for solving the problems of complex structure and high cost of the existing segmentation skewed-pole type permanent magnet synchronous motor rotor. The segmentation skewed-pole type permanent magnet synchronous motor comprises a main shaft; the main shaft is sleeved with at least two sections of annular permanent magnets; a first flux-isolating baffle ring is arranged between adjacent two annular permanent magnets; and the first flux-isolating baffle ring is provided with a positioning structure used for circumferentially positioning the annular permanent magnets on the two sides of the first flux-isolating baffle ring to enable the at least two sections of the annular permanent magnets, which are axially distributed along the main shaft, to be deflected at a preset angle of theta along the same turning direction of the axial rotation line. Through the positioning structure on the first flux-isolating baffle ring, the segmentation skewed-pole type permanent magnet synchronous motor is realized conveniently and the cogging torque of the motor is reduced; and in addition, the segmentation skewed-pole type permanent magnet synchronous motor is simple in structure, low in cost and capable of solving the bottleneck problem that the annular magnetic steel with larger sizes cannot be processed at present.

Description

A segmented oblique pole permanent magnet synchronous motor rotor

technical field

The invention relates to the field of motors, in particular to a segmented oblique pole permanent magnet synchronous motor rotor.

Background technique

In principle, the oblique pole of the rotor can be considered to be basically the same as the skewed slot of the stator. There are two common methods, as shown in Figure 1 and Figure 2. As shown in Figure 1, the effect of continuous oblique poles is basically the same as that of stator slant slots, but this shape of magnets will greatly increase the production cost of magnets, which is not conducive to mass production. As shown in Fig. 2, the rotor segmented oblique pole method not only has better tooth harmonic and cogging torque weakening effects, but also helps to reduce the processing and production costs of magnetic steel. In order to facilitate manufacturing, the effect of skewed poles is usually adopted by the method of segmental dislocation of rotor magnetic poles.

In the prior art, it is mentioned that the method of segmented oblique poles is used to reduce the cogging torque of the permanent magnet motor. As shown in Figure 3, surface-mounted magnetic steel oblique poles are used, but it is biased towards the elaboration of a generally accepted theory. There are no substantive measures to realize oblique poles.

In the prior art, a segmented oblique pole permanent magnet synchronous motor rotor is also mentioned. Its structure is shown in Figure 4. Although this structure can achieve a better oblique pole effect, the structure is quite complicated, and it is necessary to pursue a certain It is not advisable to make the structure too complicated in terms of performance, and the too complicated structure itself will lead to uncontrollable performance of the motor.

In view of the above problems, it is urgent to provide a new segmented oblique pole permanent magnet synchronous motor rotor to solve the problems of complex structure and high cost in the prior art.

Contents of the invention

In view of this, the present invention provides a segmented oblique pole permanent magnet synchronous motor rotor with simple structure, low cost, and convenient implementation of segmented oblique poles.

For reaching this purpose, the present invention adopts following technical scheme:

A segmented oblique pole permanent magnet synchronous motor rotor, including a main shaft, on which at least two sections of annular permanent magnets are sleeved, and a first magnetic isolation ring is arranged between two adjacent annular permanent magnets, so that A positioning structure is provided on the first magnetic isolation retaining ring for circumferential positioning of the annular permanent magnets on both sides thereof, so that the at least two sections of annular permanent magnets arranged in the axial direction of the main shaft are along the The same rotation direction around the axis is sequentially deflected by a predetermined angle θ.

Preferably, the two side surfaces of the first magnetic isolating retaining ring are respectively attached to the opposite side surfaces of the annular permanent magnet.

Preferably, both ends of the at least two ring-shaped permanent magnets are provided with a second magnetic isolation ring, and the second magnetic isolation ring is an interference fit with the main shaft;

The opposite side surfaces of the second magnetic isolation retaining ring and the annular permanent magnet adjacent to it are attached to each other.

Preferably, it also includes a sheath that is sheathed on the first magnetic isolation stop ring, the at least two annular permanent magnets and the second magnetic isolation stop ring at both ends, and the sheath is connected to the first magnetic isolation stop ring. The magnetic blocking ring, the at least two ring-shaped permanent magnets and the second magnetic blocking rings at both ends are interference fit.

Preferably, the first magnetic isolation ring is in interference fit with the main shaft.

Preferably, the positioning structure includes two first ribs arranged on the first side of the first magnetic isolation blocking ring and two second ribs arranged on the second side of the first magnetic isolation blocking ring, The line connecting the two first ribs and the two second ribs passes through the center of the first magnetic isolation ring, and the angle between the two lines is the preset angle θ;

The annular permanent magnet opposite to the first side of the first magnetic isolation blocking ring is provided with first grooves respectively matched with the two first convex ribs, which are compatible with the first magnetic isolation blocking ring. The ring-shaped permanent magnet opposite to the second side is provided with second grooves respectively matched with the two second ribs.

Preferably, the preset angle θ passes the formula

$\mathrm{\θ}=\frac{2\mathrm{\π}}{LCm(Z,2p)}\frac{N-1}{N}$ get,

Among them, Z is the number of stator slots; p is the number of pole pairs; N is the number of axial segments of the magnetic steel; LCM(Z,2p) represents the least common multiple of the number of stator slots Z and the number of motor poles 2p.

Preferably, the ring-shaped permanent magnet is in a clearance fit with the main shaft and bonded to the main shaft by an adhesive.

Preferably, the sheath material is nickel-based alloy, titanium alloy or carbon fiber material.

The beneficial effects of the present invention are:

The segmented oblique pole permanent magnet synchronous motor rotor provided by the present invention has at least two sections of annular permanent magnets sleeved on the main shaft, and a first magnetic isolation stop ring is arranged between adjacent annular permanent magnets, and through the first magnetic isolation The positioning structure on the retaining ring positions the annular permanent magnets in the circumferential direction, so that at least two segments of annular permanent magnets arranged in the axial direction of the main shaft are deflected by a predetermined angle in turn along the same rotation direction around the axis, so as to facilitate the realization of segmentation The inclined pole reduces the cogging torque of the motor, has a simple structure and low cost, and can solve the bottleneck problem that the current large-sized ring magnets cannot be processed.

Description of drawings

Through the following description of the embodiments of the present invention with reference to the accompanying drawings, the above and other objects, features and advantages of the present invention will be more clear, in the accompanying drawings:

Figure 1 is a schematic diagram of the continuous oblique pole of the rotor;

Figure 2 is a schematic diagram of the segmented oblique poles of the rotor;

Fig. 3 is a schematic diagram of an existing method for implementing segmented oblique poles;

Fig. 4 is a schematic diagram of another existing segmented oblique pole permanent magnet synchronous motor rotor;

Fig. 5 is a cross-sectional view of the segmented oblique pole permanent magnet synchronous motor rotor provided by a specific embodiment of the present invention;

Fig. 6 is an exploded view of the segmented oblique pole permanent magnet synchronous motor rotor provided by the specific embodiment of the present invention;

Fig. 7 is a structural diagram of cooperation between the annular permanent magnet and the first magnetic isolation ring provided by the specific embodiment of the present invention.

In the figure, 1, the main shaft; 11, the first shaft; 12, the second shaft; 13, the third shaft; 2, the annular permanent magnet; 21, the first groove; 22, the second groove; 3, 31, the first rib; 32, the second rib; 4, the second magnetic isolation ring; 5, the sheath.

detailed description

The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. To avoid obscuring the essence of the present invention, well-known methods, procedures, procedures, and components have not been described in detail.

The segmented oblique pole permanent magnet synchronous motor rotor provided by the present invention includes a main shaft, on which at least two sections of annular permanent magnets are sleeved, and a first magnetic isolation stop ring is arranged between adjacent two annular permanent magnets, and the first magnetic isolation A positioning structure is provided on the stop ring for circumferential positioning of the annular permanent magnets on both sides, so that at least two sections of annular permanent magnets arranged in the axial direction of the main shaft are sequentially deflected by preset angles along the same rotation direction around the axis theta. Through the positioning structure on the first magnetic isolation retaining ring, it is convenient to realize segmental oblique poles and reduce the cogging torque of the motor. The structure is simple and the cost is low, which can solve the current bottleneck problem that large-sized annular magnetic steel cannot be processed.

In engineering, the choice of the number of axial segments of segmented oblique pole motors is often less. In mass production, considering the convenience of processing, it is not recommended to have too many axial segments of the rotor. At the same time, the structural strength of the high-speed motor rotor also limits the number of axial segments of the magnetic steel. The number of axial segments of the motor can be selected according to the actual condition of the rotor core, and there is no need to pursue a high number of segments too much: when the number of axial segments is small and the angle of inclination is reasonable, it is still possible to control the harmonics and cogging Torque and torque ripple have a better weakening effect. In mass production, the processing and production cost of magnetic steel can be greatly reduced.

An embodiment of the segmented oblique pole permanent magnet synchronous motor rotor of the present invention will be described below with reference to FIG. 5 and FIG. 6 .

In this embodiment, the number of axial segments is two sections, as shown in Figure 5 and Figure 6, two sections of annular permanent magnets 2 are set on the main shaft 1, and a first magnetic isolation is arranged between two adjacent annular permanent magnets 2. Block ring 3. A positioning structure is provided on the first magnetic isolation ring 3 for circumferential positioning of the annular permanent magnets 2 on both sides thereof, so that one of the annular permanent magnets 2 deflects preset relative to the other annular permanent magnet 2 around the axis Angle θ, so as to realize the segmented oblique pole.

The positioning structure is not limited, as long as it can realize the circumferential positioning of the annular permanent magnet 2, in a preferred embodiment, as shown in Figure 7, the positioning structure includes two rings arranged on the first side of the first magnetic isolation ring 3 The first rib 31 and the two second ribs 32 arranged on the second side of the first magnetic barrier ring 3, the connecting lines of the two first ribs 31 and the two second ribs 32 pass through the first rib The center of the magnetic stop ring 3, and the angle between the two connecting lines is a preset angle θ.

The annular permanent magnet 2 opposite to the first side of the first magnetic isolation retaining ring 3 is provided with first grooves 21 respectively matched with two first ribs 31, and the second side of the first magnetic isolation retaining ring 3 The opposite annular permanent magnet 2 is provided with second grooves 22 respectively matched with two second ribs 32 . The circumferential positioning of the two annular permanent magnets 2 is realized through the cooperation of the ribs and the grooves, and the structure is simple and easy to implement.

Further, the two side surfaces of the first magnetic isolating retaining ring 3 are respectively attached to the side surfaces of the annular permanent magnet 2 opposite to it. The first magnetic barrier ring 3 with convex ribs can not only effectively avoid the axial magnetic flux leakage of the permanent magnet, but also can realize the oblique pole of the permanent magnet more conveniently, and solve the problem that the oblique pole of the permanent magnet motor is difficult.

Further, both ends of the two annular permanent magnets 2 are provided with a second magnetic barrier ring 4, and the second magnetic barrier ring 4 and the opposite side surfaces of the adjacent annular permanent magnet 2 are attached to each other, so that, Magnetic isolation and positioning are realized by the second magnetic isolation blocking ring 4 .

As a preferred method, both the first magnetic isolation ring 3 and the second magnetic isolation ring 4 are interference fit with the main shaft 1, and the ring-shaped permanent magnet 2 is a clearance fit with the main shaft 1 and is bonded to the main shaft 1 through adhesives such as glue. bonding.

Further, it also includes a sheath 5 that is sleeved on the first magnetic isolation ring 3, the two-section annular permanent magnet 2 and the second magnetic isolation ring 4 at both ends, and the sheath 5 is connected to the first magnetic isolation ring 3, the two Both the ring-shaped permanent magnet 2 and the second magnetic isolation retaining ring 4 at both ends are interference fit. Through the protective effect of the sheath 5, the permanent magnet rotor can run safely.

The structure of the main shaft 1 is preferably such that it includes three sections of shafts whose diameters decrease successively from one end to the two ends, which are respectively the first section shaft 11, the second section shaft 12 and the third section shaft 13, wherein, in the third section shaft 13 From one end close to the second section shaft 12 to the other end, the second magnetic isolation stop ring 4, the annular permanent magnet 2, the first magnetic isolation stop ring 3, the annular permanent magnet 2, and the second magnetic isolation stop ring 4 are sequentially set. The second magnetic barrier ring 4 of the second section shaft 12 is attached to the side surface of the second section shaft 12 . One end surface of the sheath 5 is flush with the outer surface of the second magnetic shielding ring 4 away from the second section shaft 12 , and the other end surface is attached to the side surface of the first section shaft 11 .

Preferably, the sheath 5 is made of materials such as nickel-based alloy, titanium alloy or carbon fiber material. The two annular permanent magnets 2 are all made of NdFeB material, have the same shape and size, are magnetized in parallel, and the magnetization direction is perpendicular to the direction of the grooves above.

In addition, the preset angle θ passes the formula

$\mathrm{\θ}=\frac{2\mathrm{\π}}{LCm(Z,2p)}\frac{N-1}{N}$ Initially obtained and can be optimized,

Among them, Z is the number of stator slots; p is the number of pole pairs; N is the number of axial segments of the magnetic steel; LCM(Z,2p) represents the least common multiple of the number of stator slots Z and the number of motor poles 2p. In addition, the preset angle θ can also be obtained through empirical values.

It can be understood that the number of annular permanent magnets 2 is not limited to two sections, and can be set according to specific requirements.

Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

At the same time, it should be understood that example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those skilled in the art. Numerous specific details are given, such as examples of specific components, devices and methods, to provide a thorough understanding of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known device structures and well-known technologies are not described in detail.

When an element or layer is referred to as being "on," "bonded to," "connected to," or "coupled to" another element or layer, it can be directly on the other element or layer. or layer, be directly bonded, connected or coupled to another element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly engaged to," "directly connected to," or "directly coupled to" another element or layer When , there may be no intervening elements or layers. Other words used to describe the relationship between elements should be interpreted in a like fashion (eg, "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be referred to by these Terminology restrictions. These terms may be only used to distinguish one element, component, region, layer or section from another element, region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of example embodiments. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (9)

1. A segmented oblique pole permanent magnet synchronous motor rotor, comprising a main shaft (1), characterized in that: said main shaft (1) is sleeved with at least two sections of annular permanent magnets (2), adjacent to each other A first magnetic isolation retaining ring (3) is arranged between the annular permanent magnets (2), and a positioning structure is arranged on the first magnetic isolation retaining ring (3) for the annular permanent magnets on both sides ( 2) Positioning in the circumferential direction, so that the at least two ring-shaped permanent magnets (2) arranged in the axial direction of the main shaft (1) are sequentially deflected by a preset angle θ along the same rotation direction around the axis. 2. The segmented oblique pole permanent magnet synchronous motor rotor according to claim 1, characterized in that: the two sides of the first magnetic isolation retaining ring (3) are respectively connected to the ring-shaped permanent magnet (2) opposite to it. ) side to fit. 3. The segmented oblique pole permanent magnet synchronous motor rotor according to claim 2, characterized in that: the two ends of the at least two annular permanent magnets (2) are provided with a second magnetic isolation ring (4) , the second magnetic isolation ring (4) is an interference fit with the main shaft (1); The opposite side surfaces of the second magnetic isolation retaining ring (4) and the annular permanent magnet (2) adjacent thereto are arranged in adhering manner. 4. The segmented oblique pole permanent magnet synchronous motor rotor according to claim 3, characterized in that: it also includes sleeves on the first magnetic isolation retaining ring (3), the at least two annular permanent magnets (2 ) and the sheath (5) outside the second magnetic isolating ring (4) at both ends, the sheath (5) is connected with the first magnetic isolating ring (3), the at least two annular permanent Both the magnet (2) and the second magnetic isolation retaining ring (4) at both ends are interference fit. 5 . The segmented oblique pole permanent magnet synchronous motor rotor according to claim 1 , characterized in that: the first magnetic isolation retaining ring ( 3 ) is an interference fit with the main shaft ( 1 ). 6. The segmented oblique pole permanent magnet synchronous motor rotor according to any one of claims 1 to 5, characterized in that: the positioning structure includes a set on the first side of the first magnetic isolation retaining ring (3). Two first ribs (31) and two second ribs (32) arranged on the second side of the first magnetic barrier ring (3), the two first ribs (31) and The connecting line of the two second ribs (32) both passes through the center of the first magnetic isolation ring (3), and the angle between the two connecting lines is the preset angle θ; The annular permanent magnet (2) opposite to the first side of the first magnetic isolation retaining ring (3) is provided with first grooves (21) respectively matched with the two first ribs (31) ), the second side of the annular permanent magnet (2) opposite to the second side of the first magnetic isolation retaining ring (3) is provided with second grooves respectively matched with the two second ribs (32) (twenty two). 7. The segmented oblique pole permanent magnet synchronous motor rotor according to any one of claims 1 to 5, characterized in that: the preset angle θ is obtained by the formula $\mathrm{\θ}=\frac{2\mathrm{\π}}{LCm(Z,2p)}\frac{N-1}{N}$ get, Among them, Z is the number of stator slots; p is the number of pole pairs; N is the number of axial segments of the magnetic steel; LCM(Z,2p) represents the least common multiple of the number of stator slots Z and the number of motor poles 2p. 8. The segmented oblique pole permanent magnet synchronous motor rotor according to any one of claims 1 to 5, characterized in that: the annular permanent magnet (2) is in a clearance fit with the main shaft (1) and is bonded The bonding agent is bonded to the main shaft (1). 9. The segmented oblique pole permanent magnet synchronous motor rotor according to claim 5, characterized in that: the material of the sheath (5) is nickel-based alloy, titanium alloy or carbon fiber material.