阅读说明：本技术 一种电机转子结构、永磁电机 (Motor rotor structure and permanent magnet motor ) 是由 熊博文 张芳 龚高 彭利明 于 2021-07-26 设计创作，主要内容包括：本发明公开了一种电机转子结构、永磁电机。所述电机转子结构包括：第一短轴,所述第一短轴的一端形成有第一端部连接段；第二短轴,所述第二短轴与所述第一短轴同轴设置,且所述第二短轴的一端形成有第二端部连接段；转子护套,所述转子护套采用筒状结构且沿转子护套轴向方向具有伸缩性,其中所述转子护套的一端套设在所述第一端部连接段上；所述转子护套的另一端套设在所述第二端部连接段上；磁钢,所述磁钢设置在所述转子护套内,且所述磁钢位于所述第一端部连接段和所述第二端部连接段之间；速度驱动器组件,嵌套在所述转子护套内部,用于驱动所述转子护套产生伸缩形变。(The invention discloses a motor rotor structure and a permanent magnet motor. The motor rotor structure includes: a first stub shaft having one end formed with a first end connection section; the second short shaft is coaxially arranged with the first short shaft, and a second end connecting section is formed at one end of the second short shaft; the rotor sheath is of a cylindrical structure and has elasticity along the axial direction of the rotor sheath, and one end of the rotor sheath is sleeved on the first end connecting section; the other end of the rotor sheath is sleeved on the second end connecting section; the magnetic steel is arranged in the rotor sheath, and the magnetic steel is positioned between the first end connecting section and the second end connecting section; and the speed driver assembly is nested inside the rotor sheath and is used for driving the rotor sheath to generate telescopic deformation.)

1. An electric motor rotor structure, comprising:

a first stub shaft having one end formed with a first end connection section;

the second short shaft is coaxially arranged with the first short shaft, and a second end connecting section is formed at one end of the second short shaft;

the rotor sheath is of a cylindrical structure and has elasticity along the axial direction of the rotor sheath, and one end of the rotor sheath is sleeved on the first end connecting section; the other end of the rotor sheath is sleeved on the second end connecting section;

the magnetic steel is arranged in the rotor sheath, and the magnetic steel is positioned between the first end connecting section and the second end connecting section;

and the speed driver assembly is nested inside the rotor sheath and is used for driving the rotor sheath to generate telescopic deformation.

2. The electric machine rotor structure of claim 1, wherein an end of the first end connection section near the magnetic steel is sleeved with the rotor sheath, and a diameter of a portion of the first end connection section not sleeved with the rotor sheath is larger than a diameter of a portion of the first end connection section sleeved with the metal sheath.

3. The electric machine rotor structure of claim 2, wherein an end of the second end connecting section near the magnetic steel is sleeved with the rotor sheath, and a diameter of a portion of the second end connecting section not sleeved with the rotor sheath is larger than a diameter of a portion of the second end connecting section sleeved with the metal sheath.

4. The electric machine rotor structure of claim 3, wherein the rotor sheath comprises:

the middle section sheath is wrapped with the magnetic steel; and

the first telescopic sheath is connected to one end of the middle-section sheath and sleeved with the first end connecting section; and/or a second telescopic sheath connected to the other end of the middle sheath, wherein the second end connecting section is sleeved with the second telescopic sheath;

when the first telescopic sheath is in a contracted state, the first telescopic sheath is matched with the first end connecting section to form a first annular heat dissipation groove, and the first annular heat dissipation groove is used for dissipating heat of a motor rotor structure; and/or when the second telescopic sheath is in a contraction state, the second telescopic sheath is matched with the second end connecting section to form a second annular heat dissipation groove, and the second annular heat dissipation groove is used for dissipating heat of the motor rotor structure.

5. The electric machine rotor structure of claim 4, wherein the first telescoping sheath is an interference fit with the first end connection and the first telescoping sheath has a coefficient of thermal expansion less than the coefficient of thermal expansion of the first end connection.

6. The electric machine rotor structure of claim 4, wherein the second telescoping jacket is an interference fit with the second end connection and has a coefficient of thermal expansion less than a coefficient of thermal expansion of the second end connection.

7. The electric machine rotor structure of claim 1, wherein the speed drive assembly comprises:

at least one first speed drive disposed within the rotor sheath and located proximate an outer end side of the first end connection segment; and/or the presence of a gas in the gas,

at least one second speed drive disposed within the rotor sheath and located proximate an outer end side of the second end connection segment.

8. The electric machine rotor structure of claim 7, wherein the speed drive assembly comprises a plurality of first speed drives evenly distributed about the rotor sheath inner circumferential wall.

9. The electric machine rotor structure of claim 7, wherein the speed drive assembly comprises a plurality of secondary speed drives evenly distributed about the rotor sheath inner circumferential wall.

10. A permanent magnet electrical machine, characterized in that the permanent magnet electrical machine comprises an electrical machine rotor structure according to any of claims 1-9.

11. The permanent magnet motor according to claim 10, wherein when the rotor is at a low rotation speed, the rotor sheath cuts the alternating magnetic field to generate eddy currents, the eddy currents are absorbed by the driver embedded in the rotor sheath, the driver is charged, and the sheath is in an initial state; when the rotor is in a high rotating speed, the driver discharges electricity to push the telescopic part in the sheath to extend to cover the rotor shaft, and the sheath and the short shaft are in a tightly-holding state; when the rotating speed of the motor is reduced from high speed to low speed, the driver is charged again, the telescopic part sheath and the short shaft are not held tightly, and the driver pushes the sheath back to the initial state.

Technical Field

The invention relates to the technical field of motors, in particular to a motor rotor structure and a permanent magnet motor.

Background

At present, the high-speed permanent magnet synchronous motor has the advantages of high power density, good dynamic response, simple structure and the like, and becomes one of the research hotspots in the international electrotechnical field. However, due to the over-high rotation speed, the parts of the rotor are easily broken or even loosened under the action of a large centrifugal force, which leads to the phenomenon that the suspension precision of the rotor is deteriorated and the rotor is unstable under high-frequency operation and is forced to stop.

Disclosure of Invention

In view of this, the invention discloses a motor rotor structure and a permanent magnet motor, which are used for at least solving the problem that rotor parts are easy to loosen.

In order to achieve the above object, the invention adopts the following technical scheme:

the present invention discloses in a first aspect an electric motor rotor structure, comprising:

a first stub shaft having one end formed with a first end connection section;

the second short shaft is coaxially arranged with the first short shaft, and a second end connecting section is formed at one end of the second short shaft;

the rotor sheath is of a cylindrical structure and has elasticity along the axial direction of the rotor sheath, and one end of the rotor sheath is sleeved on the first end connecting section; the other end of the rotor sheath is sleeved on the second end connecting section;

the magnetic steel is arranged in the rotor sheath, and the magnetic steel is positioned between the first end connecting section and the second end connecting section;

and the speed driver assembly is nested inside the rotor sheath and is used for driving the rotor sheath to generate telescopic deformation.

Further optionally, one end of the first end connecting section, which is close to the magnetic steel, is sleeved with the rotor sheath, and the diameter of the part, which is not sleeved with the rotor sheath, of the first end connecting section is larger than the diameter of the part, which is sleeved with the first end connecting section, of the metal sheath.

Further optionally, one end of the second end connecting section, which is close to the magnetic steel, is sleeved with the rotor sheath, and the diameter of the part of the rotor sheath, which is not sleeved with the second end connecting section, is larger than the diameter of the part of the metal sheath, which is sleeved with the second end connecting section.

Further optionally, the rotor sheath comprises:

the middle section sheath is wrapped with the magnetic steel; and

the first telescopic sheath is connected to one end of the middle-section sheath and sleeved with the first end connecting section; and/or a second telescopic sheath connected to the other end of the middle sheath, wherein the second end connecting section is sleeved with the second telescopic sheath;

when the first telescopic sheath is in a contracted state, the first telescopic sheath is matched with the first end connecting section to form a first annular heat dissipation groove, and the first annular heat dissipation groove is used for dissipating heat of a motor rotor structure; and/or when the second telescopic sheath is in a contraction state, the second telescopic sheath is matched with the second end connecting section to form a second annular heat dissipation groove, and the second annular heat dissipation groove is used for dissipating heat of the motor rotor structure.

Further optionally, the first telescopic sheath is in interference fit with the first end connection section, and a coefficient of thermal expansion of the first telescopic sheath is smaller than a coefficient of thermal expansion of the first end connection section.

Further optionally, the second telescopic sheath is in interference fit with the second end connecting section, and a coefficient of thermal expansion of the second telescopic sheath is smaller than a coefficient of thermal expansion of the second end connecting section.

Further optionally, the speed driver assembly comprises:

at least one first speed drive disposed within the rotor sheath and located proximate an outer end side of the first end connection segment; and/or the presence of a gas in the gas,

at least one second speed drive disposed within the rotor sheath and located proximate an outer end side of the second end connection segment.

Further optionally, the speed driver assembly comprises a plurality of first speed drivers evenly distributed around the rotor sheath inner circumferential wall.

Further optionally, the speed driver assembly comprises a plurality of secondary speed drivers evenly distributed around the rotor sheath inner circumferential wall.

The invention discloses a permanent magnet motor in a second aspect, wherein the permanent magnet motor comprises any one of the motor rotor structures.

Has the advantages that: the invention improves the structure of the motor rotor, so that the rotor can be telescopically deformed to tightly hold and nest the rotating shaft in the rotating process, the problems of breakage and even loosening of parts of the rotor caused by the action of larger centrifugal force are solved, the suspension precision of the rotor is ensured, and the phenomenon of forced shutdown caused by the instability of the rotor under high-frequency operation is avoided. The motor rotor structure ensures the stability of rotation and integrally protects the connection relation between the rotors.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.

FIG. 1 illustrates a schematic view of a rotor structure (rotor sheath retracted) of an electric machine of an embodiment;

fig. 2 shows a schematic view of a rotor structure (rotor sheath extended) of an electric machine of an embodiment.

In the figure: 1. a first minor axis; 11. a first end connection section; 2. a second minor axis; 21. a second end connection section; 3. a rotor sheath; 31. a first telescoping sheath; 32. a middle section sheath; 33. a second telescoping sheath; 4. magnetic steel; 51. a first speed driver; 52. a second speed driver.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

When present motor rotor rotational speed was too high, the phenomenon that each spare part of rotor received the effect of great centrifugal force very easy emergence fracture and even pine and take off, this will lead to rotor suspension precision variation, thereby the phenomenon of shut down is forced to the rotor unstability under the high frequency operation. According to the invention, by improving the structure of the motor rotor, a telescopic rotor sheath is designed to be sleeved on the two rotating shafts, and the nesting is tighter and tighter as the rotating speed is higher, so that the stability of the connection of the rotating shafts is ensured, the problem of loosening among the rotor components is effectively solved, and the phenomenon that the rotor is unstable under high-frequency operation after the suspension precision of the rotor is deteriorated so as to be forced to stop is prevented.

To further illustrate the technical solution of the present invention, the following specific examples are provided as shown in fig. 1-2.

Example 1

In the present embodiment, there is provided a rotor structure of an electric motor, including:

a first stub shaft 1, one end of which 1 is formed with a first end connection section 11;

a second stub shaft 2, the second stub shaft 2 being coaxially disposed with the first stub shaft 1, and a second end connection section 21 being formed at one end of the second stub shaft 2;

the rotor sheath 3 is of a cylindrical structure and has elasticity along the axial direction of the rotor sheath 3, wherein one end of the rotor sheath 3 is sleeved on the first end connecting section 11; the other end of the rotor sheath 3 is sleeved on the second end connecting section 21;

the magnetic steel 4 is arranged in the rotor sheath 3, and the magnetic steel 4 is positioned between the first end connecting section 11 and the second end connecting section 21;

and the speed driver assembly is nested inside the rotor sheath 3 and is used for driving the rotor sheath 3 to generate telescopic deformation.

The motor rotor structure is characterized in that two short shafts are sleeved by a telescopic rotor sheath 3 through improving a rotor connection mode, and a magnetic steel 4 and a speed driver component adopt a micro speed driver and are arranged in the rotor sheath 3; the telescopic part based on the rotor sheath 3 is made of a material with a thermal expansion coefficient far smaller than that of the short shaft, and the rotor sheath 3 is driven to extend and tightly hold the short shaft by using a speed driver component embedded in the rotor sheath 3 in the high-speed rotation process of the rotor, so that the suspension precision of the rotor is effectively improved, and the stable operation of the motor at a high rotating speed is ensured. Preferably: the rotor sheath 3 is made of alloy materials. It should be noted that: the micro speed driver is preferably a speed driver with the length and width dimensions not exceeding 10mm, and the shape of the micro speed driver can be determined according to the structure of the sheath.

In some optional manners, an end of the first end connecting section 11 close to the magnetic steel 4 is sleeved with the rotor sheath 3, and a diameter of a portion of the first end connecting section 11 not sleeved with the rotor sheath 3 is larger than a diameter of a portion of the first end connecting section 11 sleeved with the alloy sheath. And/or one end of the second end connecting section 21 close to the magnetic steel 4 is sleeved with the rotor sheath 3, and the diameter of the part of the second end connecting section 21 not sleeved with the rotor sheath 3 is larger than that of the part of the second end connecting section 21 sleeved with the alloy sheath. Based on set up the reducing structure on the minor axis, also can carry on spacingly to the specific degree of depth that 3 covers of rotor sheath were established, prevent that rotor sheath 3 from excessively nesting on the minor axis and causing the unable condition such as withdraw of 3 parts of rotor sheath, also can avoid rotor sheath 3 overreach to influence other structures.

Specifically, the rotor sheath 3 includes:

the middle section sheath 32, the middle section sheath 32 is wrapped with the magnetic steel 4; and

the first telescopic sheath 31 is connected with one end of the middle section sheath 32, and the first end connecting section 11 is sleeved with the first telescopic sheath 31; and/or a second telescopic sheath 33 connected to the other end of the middle sheath 32, wherein the second end connecting section 21 is sleeved with the second telescopic sheath 33.

Preferably, the middle sheath 32 has annular nesting grooves at both ends thereof, and the retractable sheath can be partially nested in the annular nesting grooves, so that the retractable sheath can reduce the portion nested in the annular nesting grooves, i.e. more portion extending outwards, when the speed driver is driven.

Correspondingly, when the first telescopic sheath 31 is in a contracted state, the first telescopic sheath 31 is matched with the first end connecting section 11 to form a first annular heat dissipation groove, and the first annular heat dissipation groove is used for dissipating heat of the motor rotor structure; and/or when the second telescopic sheath 33 is in a contracted state, the second telescopic sheath 33 is matched with the second end connecting section 21 to form a second annular heat dissipation groove, and the second annular heat dissipation groove is used for dissipating heat of the motor rotor structure. In the embodiment, as the magnetic steel 4 is arranged between the two short shafts, the micro speed driver is embedded in the rotor sheath 3, and the first short shaft 1, the second short shaft 2, the magnetic steel 4 and the outer telescopic rotor sheath 3 are in interference fit, the rotor sheath 3 does not change in the axial direction (in a shrinkage state) when the motor rotor rotates at a low speed, and an annular heat dissipation groove (a concave step) is formed, so that the heat dissipation area can be effectively increased; when the rotating speed is high, the speed driver pushes the rotor 3 sheath, the rotor sheath 3 stretches, the short shaft is effectively covered, and the rotor strength is enhanced. In the present embodiment, when the rotor speed is higher than 50000R/min, it is determined as high speed, and conversely, it is determined as low speed.

In this embodiment, the first telescopic sheath 31 of the rotor sheath 3 is in interference fit with the first end connecting section 11, and preferably, the thermal expansion coefficient of the first telescopic sheath 31 is selected to be smaller than that of the first end connecting section 11 when the material is selected. Optionally, the thermal expansion coefficient proportional relation satisfies: the coefficient of thermal expansion of the first telescopic sheath 31 is less than one tenth of the coefficient of thermal expansion of the first end connecting section 11.

Meanwhile, when the rotor sheath is matched with the second end connecting section 21, the second telescopic sheath 33 can be in interference fit with the second end connecting section 21, and the thermal expansion coefficient of the second telescopic sheath 33 is smaller than that of the second end connecting section 21. Optionally, the thermal expansion coefficient proportional relation satisfies: the second telescopic sheath 33 has a thermal expansion coefficient less than one tenth of the thermal expansion coefficient of the second end connecting section 21.

In the embodiment, optimization of material selection of the telescopic sheath is combined, the strength of the rotor can be effectively enhanced at a high rotating speed, all parts of the rotor are ensured to be in a tightly-held state, the suspension precision is improved, and stable operation of the motor is ensured; at low rotation speed, the rotor loss is reduced, the heat dissipation area is increased, and the temperature rise at the rotor side is effectively reduced; and when the rotor is in a full-speed section, the efficient and stable operation of the motor can be ensured.

In some alternatives, the speed driver assembly comprises: at least one first speed drive 51 arranged in the rotor housing and located close to the outer end side of the first end connection section 11; and/or at least one second speed drive 52 disposed within the rotor sheath and located proximate an outer end side of the second end coupling segment 21.

Preferably, the speed drive assembly comprises a plurality of first speed drives 51, the plurality of first speed drives 51 being evenly distributed around the inner circumferential wall of the rotor sheath. The speed drive assembly includes a plurality of secondary speed drives 52, the plurality of secondary speed drives 52 being evenly distributed about the inner circumferential wall of the rotor sheath.

It should be noted that: the rotor rotates at high speed to generate eddy current in the sheath, so that the electric energy is supplied to the micro speed driver, and when the driver detects a given rotating speed (high rotating speed), the telescopic part of the sheath is driven to effectively cover the short shaft, and the thermal expansion coefficient of the telescopic sheath material is far smaller than that of the short shaft. Therefore, under the action of temperature, the sheath can tightly hold the short shaft,

example 2

In this embodiment, a permanent magnet motor is provided, and the permanent magnet motor includes the motor rotor structure according to any one of embodiments 1.

The motor rotor structure comprises two short shafts, magnetic steel 4, a micro speed driver and a telescopic rotor sheath. The magnetic steel 4 is arranged between the two short shafts, the micro speed driver is embedded in the rotor sheath, and the telescopic part of the rotor sheath is made of a material with a thermal expansion coefficient far smaller than that of the short shafts; the two short shafts, the magnetic steel 4 and the telescopic rotor sheath at the outer side are in interference fit.

When the rotor is at a low rotating speed, the sheath cuts the alternating magnetic field to generate eddy currents, the eddy currents are effectively absorbed by the micro driver embedded in the sheath, the driver is charged at the moment, and the sheath is in an initial state.

When the rotor is in a high rotating speed, the micro driver discharges electricity to push the telescopic part in the sheath to extend and effectively cover the rotor shaft, and the sheath and the short shaft are in a tightly-holding state due to the fact that the thermal expansion coefficient is far smaller than that of the short shaft, so that stable operation of the rotor at a high speed is effectively guaranteed.

When the rotating speed of the motor is reduced to a low rotating speed, the micro-driver is charged again, the telescopic part sheath and the short shaft are not held tightly along with the reduction of the loss of the rotor side and the reduction of the temperature under the low frequency, and the micro-speed driver pushes the sheath back to the initial state. Along with the shrink of rotor sheath length, cause the eddy current loss to reduce, the recess that exposes will effectively increase rotor heat radiating area, and the rotor temperature rise further reduces, effectively promotes the motor performance.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.