CN220022507U

CN220022507U - Magnetic suspension motor

Info

Publication number: CN220022507U
Application number: CN202320523533.2U
Authority: CN
Inventors: 陆屹; 周国辉
Original assignee: Fujian Snowman Compressor Co ltd
Current assignee: Fujian Snowman Compressor Co ltd
Priority date: 2023-03-17
Filing date: 2023-03-17
Publication date: 2023-11-14
Anticipated expiration: 2033-03-17

Abstract

The utility model relates to a magnetic suspension motor, which comprises a motor shell, a motor stator, a motor rotor and two groups of magnetic suspension bearing assemblies, wherein the motor stator is fixed on the middle end surface in the motor shell, the two groups of magnetic suspension bearing assemblies are respectively fixed on the left side and the right side in the motor shell and are respectively sleeved on rotating shafts on the two sides of the motor rotor, each group of magnetic suspension bearing assemblies comprises a group of auxiliary bearings, a gap is arranged between the rotating shaft of the motor rotor and the corresponding auxiliary bearing, and the auxiliary bearings support the rotating shaft of the motor rotor when the magnetic suspension bearing assemblies are not in a magnetic suspension working state. Therefore, the motor rotor, the motor stator and the magnetic suspension bearing assembly are combined together in the motor shell, the motor volume is reduced, the anti-interference capability of the magnetic suspension motor during high-speed rotation is improved, the auxiliary bearing can support the rotating shaft of the motor rotor when the magnetic suspension assembly is not in a magnetic suspension working state, and a certain axial impact load is born, so that the stability of the magnetic suspension motor is improved.

Description

Magnetic suspension motor

Technical Field

The utility model relates to the technical field of motors, in particular to a magnetic suspension motor.

Background

The high-speed rotating machine is widely applied in the industrial fields of compressors, fans, refrigerants and the like, and along with the continuous increase of the application rotating speed, the efficiency and the reliability of equipment face a huge test, and the magnetic suspension high-speed motor has the characteristics of no bearing friction loss, no lubrication and the like, so that the high-speed rotating machine can easily meet the high-speed application scene of tens of thousands of revolutions.

However, the existing magnetic suspension high-speed motor is generally complex in structure, complex in assembly process and unreasonable in space layout, so that the motor volume is increased, and the manufacturing and maintenance costs are high.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the utility model provides a magnetic suspension motor, which reduces the volume of the motor and simplifies the assembly process.

In order to solve the technical problems, the utility model adopts the following technical scheme:

in a first aspect, an embodiment of the present utility model provides a magnetic levitation motor, including:

the motor comprises a motor shell, a motor stator, a motor rotor and two groups of magnetic suspension bearing assemblies;

the motor stator is fixed on the middle end surface in the motor shell, the middle part of the motor rotor is positioned in the motor stator, and the two groups of magnetic suspension bearing assemblies are respectively fixed on the left side surface and the right side surface in the motor shell and are respectively sleeved on rotating shafts on the two sides of the motor rotor;

each group of magnetic suspension bearing assemblies comprises a group of auxiliary bearings, a gap is arranged between the rotating shaft of the motor rotor and the corresponding auxiliary bearings, and the auxiliary bearings support the rotating shaft of the motor rotor when the magnetic suspension bearing assemblies are not in a magnetic suspension working state.

The utility model has the beneficial effects that the motor rotor, the motor stator and the magnetic suspension bearing assembly are combined together in the motor shell, the motor volume is reduced in the assembly process, the anti-interference capability of the magnetic suspension motor during high-speed rotation is improved, the auxiliary bearing can support the rotating shaft of the motor rotor when the magnetic suspension assembly is not in a magnetic suspension working state, a certain axial impact load is born, and the stability of the magnetic suspension motor is improved.

Optionally, the two groups of magnetic suspension bearing assemblies comprise a left magnetic suspension bearing assembly and a right magnetic suspension bearing assembly;

the left magnetic suspension bearing assembly and the right magnetic suspension bearing assembly comprise radial magnetic suspension coils, at least one of the left magnetic suspension bearing assembly and the right magnetic suspension bearing assembly comprises a pair of axial magnetic suspension coils, and the radial magnetic suspension coils and the axial magnetic suspension coils are respectively sleeved on rotating shafts on corresponding sides.

As can be seen from the above description, the radial magnetic levitation coils and the axial magnetic levitation coils sleeved on the corresponding sides of the rotating shaft can realize active electromagnetic control, and the generated magnetic force enables the motor rotor to maintain a levitation state in the axial and radial directions during high-speed operation.

Optionally, the motor rotor further comprises a thrust disc, wherein the thrust disc is positioned between a pair of axial magnetic suspension coils and is fixedly connected with the end face of the rotating shaft of the motor rotor.

From the above description, the thrust disc is subjected to the magnetic force of the axial magnetic levitation coil, so that the motor rotor is ensured to maintain a balanced state when being subjected to axial load.

Optionally, the unilateral maximum gap between the thrust disc and the axial magnetic suspension coil is 0.1mm-0.3mm.

According to the description, the unilateral maximum gap between the thrust disc and the bearing magnetic suspension coil is limited, so that the maximum magnetic force action of the axial magnetic suspension coil on the thrust disc is ensured.

Optionally, bearing seats are correspondingly arranged on the left side surface and the right side surface in the motor casing, and the two groups of magnetic suspension bearing assemblies are respectively and fixedly connected with the bearing seats on the corresponding sides.

From the above description, the magnetic suspension bearing assembly is fixed with the motor shell through the bearing seats on the left and right sides of the motor shell, so that the complete superposition of the rotating shaft of the motor rotor and the motor stator core part is ensured.

Optionally, the device further comprises a left displacement sensor and a right displacement sensor, wherein the left displacement sensor and the right displacement sensor are sleeved on the rotating shaft at the corresponding side.

According to the above description, the left displacement sensor and the right displacement sensor sleeved on the rotating shaft of the motor rotor can feed back the displacement condition of the motor rotor in real time, so that the motor rotor is ensured to maintain a balanced state.

Optionally, the motor housing is provided with a spiral cooling flow passage inside corresponding to the motor stator.

According to the description, the spiral cooling flow channel corresponding to the motor stator is cast in the motor shell, so that the cooling of the motor stator is realized while the coolant is prevented from contacting the motor rotor, and the peak performance of the motor is improved.

Optionally, the windings at two ends of the motor stator are covered with epoxy glue layers.

From the above description, the epoxy glue layer on the winding can ensure the insulation and heat dissipation performance of the winding.

Optionally, the motor further comprises an electric connecting piece, threaded holes are formed in two ends outside the motor casing, and the electric connecting piece is in sealing connection with the threaded holes.

As is apparent from the above description, the electrical connector can lead the cable inside the motor housing to the outside of the motor housing through the screw hole.

Optionally, a unilateral maximum gap between the rotating shaft of the motor rotor and the corresponding auxiliary bearing is 0.2mm-0.4mm.

According to the description, the unilateral maximum gap between the rotating shaft of the motor rotor and the corresponding auxiliary bearing is limited, so that the rotating shaft of the motor rotor can be effectively supported when the magnetic suspension bearing assembly is not in a magnetic suspension working state, a certain axial impact load is born, and the structural safety of the motor rotor from a suspension state to a landing state is ensured.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment 1 of a magnetic levitation motor according to the present utility model;

[ reference numerals description ]

1. A motor housing; 11. a spiral cooling flow passage; 12. a bearing seat; 13. a threaded hole;

2. a motor stator; 21. a winding;

3. a motor rotor; 31. a rotating shaft;

4. a magnetic bearing assembly; 41. an auxiliary bearing; 42. a left magnetic bearing assembly; 43. a right magnetic bearing assembly; 44. radial magnetic suspension coils; 45. an axial magnetic levitation coil;

5. a thrust plate;

6. a left displacement sensor;

7. a right displacement sensor;

8. an electrical connection.

Detailed Description

In order that the above-described aspects may be better understood, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

Wherein reference herein to an "upper" bearing noun is made to the orientation of fig. 1.

Example 1:

referring to fig. 1, the utility model improves a magnetic suspension motor, which comprises a motor shell 1, a motor stator 2, a motor rotor 3, two groups of magnetic suspension bearing assemblies 4, a thrust disc 5, a left displacement sensor 6, a right displacement sensor 7 and an electric connecting piece 8.

The motor shell 1 is formed by casting and processing aluminum magnesium alloy, the whole motor shell is of a cylindrical structure, and each group of installation end faces are internally processed and used for installing components such as a motor stator 2, a magnetic suspension bearing component 4 and the like.

In this embodiment, the motor stator 2 is fixed on the middle end surface in the motor housing 1, where the motor housing 1 is provided with a spiral cooling flow channel 11 in the interior corresponding to the motor stator 2, and cooling of the motor stator 2 is achieved through the refrigerant of the spiral cooling flow channel 11, so as to increase the peak performance of the motor. Wherein, the two ends of the motor stator 2 are covered with epoxy glue layers on the windings 21, the insulation and heat dissipation of the windings 21 are ensured by the epoxy glue layers, and in a specific embodiment, the epoxy glue layers are 2mm beyond the end surfaces of the windings 21. Specifically, in this embodiment, the motor housing 1 and the motor stator 2 are installed in an interference fit by heating, and then the windings 21 at both ends of the motor stator 2 are completely covered with potting epoxy to complete the fixed installation of the motor stator 2.

As shown in fig. 1, the two groups of magnetic suspension bearing assemblies 4 are respectively fixed on the left and right side surfaces in the motor housing 1 and respectively sleeved on the rotating shafts 31 on the two sides of the motor rotor 3. The left side surface and the right side surface in the motor shell 1 are correspondingly provided with bearing seats 12, and the two groups of magnetic suspension bearing assemblies 4 are respectively and fixedly connected with the bearing seats 12 on the corresponding sides, so that the motor stator 2, the motor rotor 2 and the magnetic suspension bearing assemblies 4 are combined together in the motor shell 1, the assembly process is simplified, the motor volume is reduced, and meanwhile, the anti-interference capability of the magnetic suspension motor during high-speed rotation is improved.

Each group of magnetic suspension bearing assemblies 4 comprises a group of auxiliary bearings 41, and the auxiliary bearings 41 support the rotating shaft 31 of the motor rotor 3 when the magnetic suspension bearing assemblies 4 are not in a magnetic suspension working state, wherein the unilateral maximum gap between the rotating shaft 31 of the motor rotor 3 and the corresponding auxiliary bearings 41 is 0.2mm-0.4mm, so that the magnetic suspension bearing assemblies 4 are ensured to support the motor rotor 3 to bear a certain axial impact load when the magnetic suspension bearing assemblies 4 are not in the magnetic suspension working state, and the stability of the magnetic suspension motor is improved. In a specific embodiment, the auxiliary bearings 41 of the two sets of magnetic suspension bearing assemblies 4 are a deep groove ball auxiliary bearing 41 and a pair of angular contact ball auxiliary bearings 41, respectively, and the unilateral maximum gap between the rotating shaft 31 of the motor rotor 3 and the corresponding auxiliary bearing 41 is preferably 0.3mm.

As shown in fig. 1, the two sets of magnetic bearing assemblies 4 include a left magnetic bearing assembly 42 and a right magnetic bearing assembly 43, where the left magnetic bearing assembly 42 and the right magnetic bearing assembly 43 each include a radial magnetic suspension coil 44, and at least one of the left magnetic bearing assembly 42 and the right magnetic bearing assembly 43 includes a pair of axial magnetic suspension coils 45, where the radial magnetic suspension coils 44 and the axial magnetic suspension coils 45 are respectively sleeved on the rotating shaft 31 on the corresponding sides, and active electromagnetic control can be implemented by the radial magnetic suspension coils 44 and the axial magnetic suspension coils 45 sleeved on the corresponding sides of the rotating shaft 31, so that the motor rotor 3 can maintain a suspension state in the axial and radial directions during high-speed operation by generated magnetic force. In a particular embodiment, the axial magnetic levitation coil 45 in this embodiment is positioned on the right magnetic bearing assembly 43 in the orientation shown in FIG. 1. As shown in fig. 1, the left displacement sensor 6 and the right displacement sensor 7 are sleeved on the rotating shaft 31 at the corresponding sides, so as to realize feedback on the displacement condition of the motor rotor 3 in real time, thereby ensuring that the motor rotor 3 maintains a balanced state.

The thrust discs 5 are located between the pair of axial magnetic levitation coils 45 and are fixedly connected with the end face of the rotating shaft 31 of the motor rotor 3, and the unilateral maximum gap between the thrust discs 5 and the axial magnetic levitation coils 45 is 0.1mm-0.3mm, so that the thrust discs 5 are guaranteed to be subjected to the magnetic force action of the axial magnetic levitation coils 45, the motor rotor 3 is guaranteed to maintain a balanced state when being subjected to axial load, and in a specific embodiment, the unilateral maximum gap between the thrust discs 5 and the axial magnetic levitation coils 45 is preferably 0.2mm.

Specifically, referring to fig. 1, in the present embodiment, the middle portion of the motor rotor 3 is located in the motor stator 2, a set of auxiliary bearings 41, a left displacement sensor 6 and a radial magnetic levitation coil 44 are sequentially sleeved on the left rotating shaft 31 of the motor rotor 3, and an axial magnetic levitation coil 45, a thrust disc 5, a set of auxiliary bearings 41, a right displacement sensor 7 and a radial magnetic levitation coil 44 are sequentially sleeved on the right rotating shaft 31 of the motor rotor 3.

Wherein, the both ends outside motor housing 1 are provided with screw hole 13, electric connector 8 with screw hole 31 sealing connection to when guaranteeing the inside sealed of casing, realize that electric connector 8 draws forth the outside of motor housing 1 with the cable conductor in the motor housing 1 through screw hole 31, with carry out signal feedback and processing to the bearing controller.

From this, the working principle of this embodiment is as follows:

the magnetic suspension motor in the utility model realizes the stability of the magnetic suspension motor by using the magnetic suspension bearing assemblies 4 which are arranged at the left side and the right side in the motor shell 1 and sleeved on the rotating shafts 31 at the two sides of the motor rotor 3. When the magnetic suspension motor operates, active electromagnetic control is realized through the radial magnetic suspension coil 44 and the axial magnetic suspension coil 45 in the magnetic suspension bearing assembly 4, the magnetic force generated by the radial magnetic suspension coil 44 and the axial magnetic suspension coil 45 enables the motor rotor 3 to be in a stable balanced state in the axial direction and the radial direction when the motor rotor 3 operates at a high speed, the axial center position change of the motor rotor 3 is detected in real time through the left displacement sensor 6 and the right displacement sensor 7 in the magnetic suspension bearing assembly 4, the position change is transmitted to the bearing controller outside the motor shell 1 through a cable, the bearing controller converts the acquired position change into a control signal, and the magnitude of the current in the radial magnetic suspension coil 44 and the axial magnetic suspension coil 45 is controlled, so that the axial center of the motor rotor 3 is driven to return to the position in the right center, therefore, the motor rotor 3 can always be in a stable balanced state when the magnetic suspension motor is operated, the motor rotor 3 can be ensured to be stably operated, and the auxiliary bearing 41 in the bearing assembly 4 can bear a certain axial impact load when the motor rotor is not operated, and the motor rotor 3 is ensured to safely and further stably fall from the suspension state.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.

In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.

Claims

1. The magnetic suspension motor is characterized by comprising a motor shell, a motor stator, a motor rotor and two groups of magnetic suspension bearing assemblies;

2. A magnetic levitation motor as defined in claim 1, wherein two sets of said magnetic bearing assemblies comprise a left magnetic bearing assembly and a right magnetic bearing assembly;

3. A magnetic levitation motor as defined in claim 2, further comprising a thrust disc positioned between a pair of said axial magnetic levitation coils and fixedly coupled to a shaft end surface of said motor rotor.

4. A magnetic levitation motor as defined in claim 3, wherein the single-sided maximum gap between said thrust disc and said axial magnetic levitation coil is 0.1mm-0.3mm.

5. A magnetic levitation motor according to claim 1, wherein bearing seats are correspondingly arranged on the left and right sides in the motor housing, and two groups of the magnetic bearing assemblies are fixedly connected with the bearing seats on the corresponding sides respectively.

6. A magnetic levitation motor according to claim 1, further comprising a left displacement sensor and a right displacement sensor, wherein the left displacement sensor and the right displacement sensor are sleeved on the rotating shaft on the corresponding sides.

7. A magnetic levitation motor according to claim 1, wherein the motor housing is provided with a spiral cooling flow passage at an interior corresponding to the motor stator.

8. A magnetic levitation motor according to claim 1, wherein both end windings of the motor stator are covered with an epoxy layer.

9. A magnetic levitation motor as defined in claim 1, further comprising an electrical connector, wherein threaded holes are provided at both ends of the motor housing, and wherein the electrical connector is hermetically connected to the threaded holes.

10. A magnetic levitation motor according to claim 1, wherein the unilateral maximum gap between the rotating shaft of the motor rotor and the corresponding auxiliary bearing is 0.2-0.4 mm.