阅读说明：本技术 一种永磁同步电机 (Permanent magnet synchronous motor ) 是由 陈志� 刘元宜 于 2019-12-05 设计创作，主要内容包括：本发明公开了一种永磁同步电机,包括环形转子、内环形定子及外环形定子,环形转子包括交替设置的N极磁铁与S极磁铁；每个N极磁铁均包括至少两个沿轴向排布连接的N极磁片；每个S极磁铁均包括至少两个沿轴向排布连接的S极磁片；内环形定子及外环形定子均与环形转子配合连接；至少两个沿轴向排布连接的N极磁片对齐设置且至少两个沿轴向排布连接的S极磁片对齐设置,内环形定子与外环形定子沿周向错位设置；或者,内环形定子与外环形定子沿周向对齐设置,并且至少两个沿轴向排布连接的N极磁片及至少两个沿轴向排布连接的S极磁片均沿周向错位设置,且至少两个N极磁片与至少两个S极磁片错位的方向相同。(The invention discloses a permanent magnet synchronous motor which comprises an annular rotor, an inner annular stator and an outer annular stator, wherein the annular rotor comprises N-pole magnets and S-pole magnets which are alternately arranged; each N-pole magnet comprises at least two N-pole magnetic sheets which are axially arranged and connected; each S-pole magnet comprises at least two S-pole magnetic sheets which are axially arranged and connected; the inner annular stator and the outer annular stator are both connected with the annular rotor in a matching way; at least two N pole magnetic sheets which are axially arranged and connected are arranged in an aligned mode, at least two S pole magnetic sheets which are axially arranged and connected are arranged in an aligned mode, and the inner annular stator and the outer annular stator are arranged in a staggered mode in the circumferential direction; or, interior annular stator aligns the setting with outer annular stator along circumference to at least two N utmost point magnetic sheets of arranging the connection and at least two S utmost point magnetic sheets of arranging the connection along the axial all along circumference dislocation set, and two at least N utmost point magnetic sheets are the same with the direction of two at least S utmost point magnetic sheets dislocation.)

1. A permanent magnet synchronous motor, comprising:

the annular rotor comprises N-pole magnets and S-pole magnets which are alternately arranged; each N-pole magnet comprises at least two N-pole magnetic sheets which are axially arranged and connected; each S-pole magnet comprises at least two S-pole magnetic sheets which are axially arranged and connected;

the stator comprises an inner annular stator and an outer annular stator, wherein the inner annular stator and the outer annular stator are both connected with an annular rotor in a matching way, the inner annular stator is arranged on the inner side of the annular rotor, and the outer annular stator is arranged on the outer side of the annular rotor;

the at least two N pole magnetic sheets which are axially arranged and connected are arranged in an aligned mode, the at least two S pole magnetic sheets which are axially arranged and connected are arranged in an aligned mode, and the inner annular stator and the outer annular stator are arranged in a staggered mode along the circumferential direction; alternatively, the first and second electrodes may be,

interior annular stator aligns the setting along circumference with outer annular stator, and two at least N utmost point magnetic sheets of arranging the connection along the axial reach two at least S utmost point magnetic sheets of arranging the connection along the axial all along circumference dislocation set, just two at least N utmost point magnetic sheets are the same with the direction of two at least S utmost point magnetic sheets dislocation.

2. The permanent magnet synchronous motor according to claim 1, wherein the ring-shaped rotor includes a yoke on which the N-pole magnets and the S-pole magnets are alternately arranged.

3. The permanent magnet synchronous motor according to claim 2, wherein the annular rotor includes an inner annular rotor and an outer annular rotor respectively disposed inside and outside the yoke, the inner annular rotor being connected to the inner annular stator, and the outer annular rotor being connected to the outer annular stator.

4. The permanent magnet synchronous motor according to claim 2, wherein the inner layer annular rotor includes inner N-pole magnets and inner S-pole magnets alternately arranged inside a yoke, and the outer layer annular rotor includes outer N-pole magnets and outer S-pole magnets alternately arranged outside the yoke; the inner N-pole magnet and the outer N-pole magnet are oppositely arranged on two sides of the magnet yoke, and the inner S-pole magnet and the outer S-pole magnet are oppositely arranged on two sides of the magnet yoke.

5. The permanent magnet synchronous motor according to claim 4, wherein the inner annular stator and the outer annular stator are arranged in a circumferential alignment manner, and at least two N pole magnetic pieces arranged and connected in the axial direction in the inner N pole magnet are the same as the N pole magnetic pieces arranged and connected in the axial direction in the outer N pole magnet in a circumferential dislocation direction; and at least two S pole magnetic sheets which are axially arranged and connected in the inner S pole magnet are staggered in the same direction with at least two S pole magnetic sheets which are axially arranged and connected in the outer S pole magnet.

6. The permanent magnet synchronous motor according to any one of claims 1 to 5, wherein the inner annular stator comprises an inner annular frame and inner stator cores extending outward from the inner annular frame, each inner stator core having an inner coil wound thereon.

7. The permanent magnet synchronous motor according to claim 6, wherein the inner ring-shaped framework and the inner stator core are integrally formed.

8. The permanent magnet synchronous motor according to any one of claims 1 to 5, wherein the outer annular stator comprises an outer annular frame and outer stator cores extending inward from the outer annular frame, and each outer stator core is wound with an outer ring coil.

9. The permanent magnet synchronous motor of claim 8, wherein the outer annular skeleton is integrally formed with the outer stator core.

10. The PMSM of any one of claims 1-5, wherein each N-pole magnet includes three N-pole pieces axially aligned and connected and each S-pole magnet includes three S-pole pieces axially aligned and connected.

Technical Field

The invention relates to the technical field of motor equipment, in particular to a permanent magnet synchronous motor.

Background

The permanent magnet synchronous motor is a synchronous motor which generates synchronous rotating magnetic fields by permanent magnet excitation, and a permanent magnet synchronous motor system has the characteristics of small volume, simple structure, high reliability, high control precision, high torque density, good torque stability and low noise. In recent years, permanent magnet synchronous motors are increasingly widely used in the technical fields of industry, agriculture, household appliances, office automation equipment and the like.

The permanent magnet synchronous motor mostly adopts a structure with tooth grooves, and due to the existence of the motor tooth grooves, an air gap between a stator and a rotor of the motor is not uniform, so that the distortion of an air gap magnetic field is caused, namely, the tooth groove effect, and the tooth groove effect can cause speed fluctuation, so that adverse factors such as position control errors and vibration are caused, and the performance of the motor is reduced.

In view of the above, a new technical solution is needed to solve the above technical problems.

Disclosure of Invention

An object of the present invention is to provide a new technical solution for a permanent magnet synchronous motor.

According to a first aspect of the present invention, there is provided a permanent magnet synchronous motor comprising:

the annular rotor comprises N-pole magnets and S-pole magnets which are alternately arranged; each N-pole magnet comprises at least two N-pole magnetic sheets which are axially arranged and connected; each S-pole magnet comprises at least two S-pole magnetic sheets which are axially arranged and connected;

the stator comprises an inner annular stator and an outer annular stator, wherein the inner annular stator and the outer annular stator are both connected with an annular rotor in a matching way, the inner annular stator is arranged on the inner side of the annular rotor, and the outer annular stator is arranged on the outer side of the annular rotor;

the at least two N pole magnetic sheets which are axially arranged and connected are arranged in an aligned mode, the at least two S pole magnetic sheets which are axially arranged and connected are arranged in an aligned mode, and the inner annular stator and the outer annular stator are arranged in a staggered mode along the circumferential direction; alternatively, the first and second electrodes may be,

interior annular stator aligns the setting along circumference with outer annular stator, and two at least N utmost point magnetic sheets of arranging the connection along the axial reach two at least S utmost point magnetic sheets of arranging the connection along the axial all along circumference dislocation set, just two at least N utmost point magnetic sheets are the same with the direction of two at least S utmost point magnetic sheets dislocation.

Optionally, the ring-shaped rotor includes a yoke on which the N-pole magnets and the S-pole magnets are alternately arranged.

Optionally, the annular rotor includes an inner annular rotor and an outer annular rotor respectively disposed inside and outside the magnetic yoke, the inner annular rotor is connected to the inner annular stator, and the outer annular rotor is connected to the outer annular stator.

Optionally, the inner-layer annular rotor comprises inner N-pole magnets and inner S-pole magnets alternately arranged on the inner side of the magnetic yoke, and the outer-layer annular rotor comprises outer N-pole magnets and outer S-pole magnets alternately arranged on the outer side of the magnetic yoke; the inner N-pole magnet and the outer N-pole magnet are oppositely arranged on two sides of the magnet yoke, and the inner S-pole magnet and the outer S-pole magnet are oppositely arranged on two sides of the magnet yoke.

Optionally, the inner annular stator and the outer annular stator are arranged in a circumferential alignment manner, and at least two axially aligned and connected N-pole magnetic sheets in the inner N-pole magnet are the same as at least two axially aligned and connected N-pole magnetic sheets in the outer N-pole magnet in the circumferential misalignment direction; and at least two S pole magnetic sheets which are axially arranged and connected in the inner S pole magnet are staggered in the same direction with at least two S pole magnetic sheets which are axially arranged and connected in the outer S pole magnet.

Optionally, the inner ring-shaped stator includes an inner ring-shaped frame and inner stator cores extending outward from the inner ring-shaped frame, and each inner stator core is wound with an inner ring coil.

Optionally, the inner annular framework and the inner stator core are integrally formed.

Optionally, the outer annular stator includes an outer annular frame and an outer stator core extending inward from the outer annular frame, and each outer stator core is wound with an outer ring coil.

Optionally, the outer annular framework is integrally formed with the outer stator core.

Optionally, each of the N-pole magnets includes three N-pole magnetic pieces axially arranged and connected and each of the S-pole magnets includes three S-pole magnetic pieces axially arranged and connected.

According to the permanent magnet synchronous motor provided by the invention, the maximum positions of the annular rotor relative to the inner annular stator and the outer annular stator, which generate the cogging torque, are staggered in the circumferential direction through circumferential dislocation, so that the phenomena of vibration, speed fluctuation and the like caused by the cogging during the operation of the whole motor are reduced.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic structural diagram of a first embodiment of a permanent magnet synchronous motor according to the present invention;

fig. 2 is a schematic structural diagram of a second embodiment of a permanent magnet synchronous motor according to the present invention;

FIG. 3 is a schematic structural diagram of an embodiment of a ring rotor in a PMSM according to the present invention;

fig. 4 is a schematic structural view of another embodiment of a ring rotor in a permanent magnet synchronous motor according to the present invention;

fig. 5 is a partial schematic structural view showing another embodiment of a ring rotor in a permanent magnet synchronous motor according to the present invention;

fig. 6 is a schematic structural diagram of an inner annular stator and an outer annular stator in a permanent magnet synchronous motor according to the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

According to an embodiment of the present invention, there is provided a permanent magnet synchronous motor including:

the annular rotor 1 comprises N-pole magnets and S-pole magnets which are alternately arranged; each N-pole magnet comprises at least two N-pole magnetic sheets which are axially arranged and connected; each S-pole magnet comprises at least two S-pole magnetic sheets which are axially arranged and connected;

the permanent magnet synchronous motor also comprises an inner annular stator 2 and an outer annular stator 3, wherein the inner annular stator 2 and the outer annular stator 3 are both connected with the annular rotor 1 in a matching way, the inner annular stator 2 is arranged on the inner side of the annular rotor 1, and the outer annular stator 3 is arranged on the outer side of the annular rotor 1;

the at least two N pole magnetic sheets which are axially arranged and connected are arranged in an aligned mode, the at least two S pole magnetic sheets which are axially arranged and connected are arranged in an aligned mode, and the inner annular stator 2 and the outer annular stator 3 are arranged in a staggered mode in the circumferential direction; alternatively, the first and second electrodes may be,

interior annular stator 2 aligns the setting along circumference with outer annular stator 3, and two at least N utmost point magnetic sheets of arranging the connection along the axial reach two at least S utmost point magnetic sheets of arranging the connection along the axial all along circumference dislocation set, just two at least N utmost point magnetic sheets are the same with the direction of two at least S utmost point magnetic sheets dislocation.

In order to reduce the cogging effect, the permanent magnet synchronous motor provided in the embodiment of the present invention includes two schemes, as shown in fig. 1, the first scheme is that at least two N-pole magnetic pieces axially arranged and connected and at least two S-pole magnetic pieces axially arranged and connected, which correspond to N-pole magnets and S-pole magnets on an annular rotor 1, are all aligned, where the aligned arrangement means that at least two N-pole magnetic pieces are aligned along a circumferential side and at least two S-pole magnetic pieces are also aligned along a circumferential side, and at the same time, an inner annular stator 2 and an outer annular stator 3 are circumferentially staggered;

referring to fig. 2, a second scheme is to align the inner annular stator 2 and the outer annular stator 3 in the circumferential direction, and simultaneously, at least two N pole magnetic pieces and at least two S pole magnetic pieces corresponding to the N pole magnet and the S pole magnet on the annular rotor 1 are all arranged in a staggered manner in the circumferential direction, that is, the at least two N pole magnetic pieces are arranged in a staggered manner in the circumferential direction along the side edges and the at least two S pole magnetic pieces are also arranged in a staggered manner in the circumferential direction along the side edges, and the at least two N pole magnetic pieces and the at least two S pole magnetic pieces are also arranged in the same staggered manner in the same direction and at the same staggered distance, that is, the at least two N pole magnetic pieces and the at least two S pole magnetic pieces are staggered in the.

Within two kinds of technical scheme above, annular stator 2 misplaces along circumference with outer annular stator 3 relatively, perhaps the mode that misplaces takes place along circumference for N utmost point magnetic sheet and S utmost point magnetic sheet on the annular rotor 1, staggers in circumference through the maximum position that annular rotor 1 took place cogging torque relatively inner annular stator 2 and outer annular stator 3 to vibrations, speed fluctuation etc. that bring by cogging when reducing whole motor operation. In addition, the permanent magnet synchronous motor provided by the embodiment of the invention is provided with the double-layer stator of the inner annular stator 2 and the outer annular stator 3, so that the power of the motor can be effectively improved, and the energy efficiency of the motor is higher.

In one embodiment, the ring rotor 1 includes a yoke 101, and the N-pole magnets and the S-pole magnets are alternately disposed on the yoke 101. The magnetic yoke 101 itself does not generate a magnetic field, and only serves as a carrier of the N-pole magnet and the S-pole magnet to transmit magnetic lines of force in a magnetic circuit, and the material of the magnetic yoke 101 may be, for example, a silicon steel sheet, or may be soft iron, soft magnetic alloy, or the like. N-pole magnets and S-pole magnets are alternately arranged on the yoke 101 with a gap between every two adjacent N-pole magnets and S-pole magnets.

Referring to fig. 3, in one embodiment, the annular rotor 1 includes an inner annular rotor 11 and an outer annular rotor 12 respectively disposed inside and outside a yoke 101, the inner annular rotor 11 is connected to the inner annular stator 2, and the outer annular rotor 12 is connected to the outer annular stator 3. The double-layer rotor design comprising the inner-layer annular rotor 11 and the outer-layer annular rotor 12 in the embodiment can effectively improve the power of the motor, so that the energy efficiency of the motor is higher.

In one embodiment, the inner annular rotor 11 includes inner N-pole magnets 111 and inner S-pole magnets 112 alternately disposed inside the yoke 101, and the outer annular rotor 12 includes outer N-pole magnets 121 and outer S-pole magnets 122 alternately disposed outside the yoke 101; the inner N-pole magnet 111 and the outer N-pole magnet 121 are disposed to face each other on both sides of the yoke 101, and the inner S-pole magnet 112 and the outer S-pole magnet 122 are disposed to face each other on both sides of the yoke 101. That is, one inner N-pole magnet 111 corresponds to one outer N-pole magnet 121 on the opposite side of the yoke 101, while one inner S-pole magnet 112 corresponds to one outer S-pole magnet 122 on the opposite side of the yoke 101. The arrangement can ensure that the magnetic action can be increased after the inner annular rotor 11 and the outer annular rotor 12 are overlapped so as to improve the power of the motor.

Referring to fig. 2, 4 and 5, in one embodiment, the inner annular stator 2 and the outer annular stator 3 are circumferentially aligned, and at least two axially aligned N-pole magnet pieces of the inner N-pole magnet 111 are circumferentially shifted in the same direction as at least two axially aligned N-pole magnet pieces of the outer N-pole magnet 121; at least two S-pole magnet pieces axially arranged and connected in the inner S-pole magnet 112 and at least two S-pole magnet pieces axially arranged and connected in the outer S-pole magnet 122 are in the same direction. In the embodiment of providing the double-layer ring rotor including the inner-layer ring rotor 11 and the outer-layer ring rotor 12, when the cogging effect is reduced by the second aspect, the N-pole pieces in the N-pole piece outer N-pole magnet 121 in the inner N-pole magnet 111 need to be circumferentially displaced in the same direction and the same width, and the S-pole piece in the inner S-pole magnet 112 and the S-pole piece in the outer S-pole magnet 122 need to be circumferentially displaced in the same direction and the same width.

Referring to fig. 6, in one embodiment, the inner ring stator 2 includes an inner ring frame 21 and inner stator cores 22 extending from the inner ring frame 21, and each inner stator core 22 is wound with an inner ring coil 23. The gap between every two adjacent inner stator cores 22 forms the tooth slot of the inner annular stator 2, and the material of the inner annular framework 21 and the inner stator cores 22 may be, for example, silicon steel sheets.

In one embodiment, the inner ring frame 21 and the inner stator core 22 are integrally formed. The integral forming is convenient to manufacture and has firm structure.

In one embodiment, the outer annular stator 3 includes an outer annular frame 31 and outer stator cores 32 extending inward from the outer annular frame 31, and each of the outer stator cores 32 has an outer coil 33 wound thereon. The gap between every two adjacent outer stator cores 32 forms the tooth slot of the outer annular stator 3, and the material of the outer annular framework 31 and the outer stator cores 32 may be, for example, silicon steel sheets.

In one embodiment, the outer annular frame 31 is integrally formed with the outer stator core 32. The integral forming is convenient to manufacture and has firm structure.

In one embodiment, each of the N-pole magnets includes three N-pole magnetic pieces axially arranged and connected and each of the S-pole magnets includes three S-pole magnetic pieces axially arranged and connected. Every N utmost point magnet sets up three N utmost point magnetic sheet and every S utmost point magnet sets up three S utmost point magnetic sheet and can easy to assemble and the effect when adopting the second scheme to reduce the tooth' S socket effect is more obvious.

In the above embodiments, "inner" refers to a direction toward the center of a circle as shown in fig. 1 and 2, and "outer" refers to a direction away from the center of a circle as shown in fig. 1 and 2.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, the terms describing the positional relationships in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.