Axial positioning structure of magnetic suspension motor rotor

Abstract

The utility model provides an axial positioning structure of a magnetic suspension motor rotor, which is mounted on the periphery of a main shaft, is used for positioning the axial relative position of the main shaft in a casing, and comprises an axial rotor disc, the axial rotor disc is fixedly sleeved on the periphery of the main shaft, and two sides of the axial rotor disc are respectively provided with a magnetic component. Each magnetic attraction part is fixedly connected to the inner ring of the machine shell, and the two magnetic attraction parts are used for positioning the axial relative position of the main shaft in the machine shell in a magnetic attraction mode. According to the axial positioning structure of the magnetic suspension motor rotor, the axial rotor disc and the main shaft can be driven to move axially through magnetic attraction of the magnetic attraction component, so that the relative position of the main shaft in the casing can be adjusted, and a worker can control the axial position of the main shaft conveniently.

Description

Technical Field

[0001] The utility model belongs to the field of magnetic suspension motors, in particular to an axial positioning structure of a rotor of a magnetic suspension motor. Background Art

[0002] Magnetic levitation motor is a special motor with contactless operation between stator and mover. According to the force of magnetic field, it is divided into attraction type and repulsion type; according to the degree of magnetic field coupling, it is divided into independent control type of suspension force and driving force and coupling control type of suspension force and driving force; according to the structure of stator and mover, it is divided into magnetic levitation rotary motor and magnetic levitation linear motor. It is used in occasions such as magnetic levitation trains, magnetic levitation bearings and magnetic levitation artificial heart blood pumps. In the existing technology, there is a problem of axial movement during the movement of the mover due to the contactless operation between the stator and mover, which will cause equipment abnormality or damage. Utility Model Content

[0003] In view of this, the utility model aims to propose an axial positioning structure for a magnetic levitation motor rotor to solve the problem of axial movement when the rotor and stator on the output shaft of the prior art magnetic levitation motor are in a suspended state and there is no axial limit.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A magnetic levitation motor rotor axial positioning structure is installed on the periphery of the main shaft and is used to locate the axial relative position of the main shaft in the casing. The structure comprises an axial rotor disk, and the axial rotor disk is fixedly sleeved on the periphery of the main shaft. A magnetic attraction component is respectively arranged on both sides of the axial rotor disk, and each magnetic attraction component is fixedly connected to the inner ring of the casing. The two magnetic attraction components are used to magnetically locate the axial relative position of the main shaft in the casing.

[0006] Furthermore, a mounting groove is arranged on the periphery of the main shaft, the axial rotor disk is fixedly sleeved into the mounting groove through a rotor lock nut, and first gaskets are arranged on both sides of the axial rotor disk, one side of the first gasket abuts against the mounting groove wall or one end of the shaft lock nut.

[0007] Furthermore, the first gasket is a hollow cylindrical structure.

[0008] Furthermore, the magnetic component is an axial bearing coil, and each group of axial bearing coils is fixedly connected to the inner ring of the casing through an axial positioning sleeve.

[0009] Furthermore, the axial positioning sleeve is a hollow cylindrical structure, the main shaft is located in the inner ring of the axial positioning sleeve, one end of the axial positioning sleeve is fixedly connected to the inner ring of the casing through an end cover or a fixed cover plate, the other end of the axial positioning sleeve is provided with an annular groove, the axial bearing coil is installed in the annular groove through a coil lock nut, a gap is provided between the two coil lock nuts, and the axial rotor disk is located in the gap.

[0010] Furthermore, the width of the gap is greater than the thickness of the axial rotor disk, and the main shaft can drive the axial rotor disk to float in the gap.

[0011] Furthermore, the main stator is fixedly installed on the inner ring of the casing, and the two ends of the casing are covered with end covers, a through hole is provided in the middle of the end cover, the periphery of the main shaft is located in the through hole, the periphery of the main shaft is provided with an annular groove, and the main rotor is installed in the annular groove.

[0012] Furthermore, the main rotor includes a plurality of first magnets and a fixed sleeve, the plurality of first magnets are arranged along the circumference of the annular groove, the inner ring of the fixed sleeve is fixedly connected to the outer ring of the main shaft, and the upper end of each first magnet is abutted to the inner ring of the fixed sleeve, and the lower end of the first magnet is abutted to the outer periphery of the main shaft.

[0013] Compared with the prior art, the magnetic suspension motor rotor axial positioning structure described in the utility model has the following beneficial effects:

[0014] (1) The magnetic suspension motor rotor axial positioning structure described in the utility model can drive the axial rotor disk and the main shaft to move axially through the magnetic attraction of the magnetic attraction component, so as to adjust the relative position of the main shaft in the casing, making it easier for the staff to control the axial position of the main shaft.

[0015] (2) In the magnetic suspension motor rotor axial positioning structure described in the utility model, the first gasket is a hollow cylindrical structure, and the staff can adjust the thickness of the first gasket to meet different installation conditions. The axial positioning component has a simple structure, is stable and reliable, and can withstand the high-speed output of a high-power motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0017] Figure 1 A schematic cross-sectional structure diagram of a magnetic levitation motor according to an embodiment of the utility model;

[0018] Figure 2 It is a cross-sectional schematic diagram of the main rotor according to an embodiment of the utility model;

[0019] Figure 3 It is a cross-sectional schematic diagram of an axial positioning structure of a magnetic levitation motor rotor according to an embodiment of the utility model.

[0020] Description of reference numerals:

[0021] 1. Casing; 2. End cover; 3. Main stator; 4. Main rotor; 41. Fixed sleeve; 42. First magnetic steel; 5. Main shaft; 6. Axial rotor disk; 7. Axial positioning sleeve; 8. Axial bearing coil; 9. Coil lock nut; 10. Fixed cover plate; 11. First gasket; 12. Rotor lock nut. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] like Figure 1-Figure 3 As shown, a magnetic levitation motor rotor axial positioning structure is installed on the periphery of the main shaft 5 and is used to locate the axial relative position of the main shaft 5 in the casing 1, including an axial rotor disk 6, and the axial rotor disk 6 is fixedly sleeved on the periphery of the main shaft 5, a magnetic attraction component is respectively arranged on both sides of the axial rotor disk 6, and each magnetic attraction component is fixedly connected to the inner ring of the casing 1, and the two magnetic attraction components are used for magnetically positioning the axial relative position of the main shaft 5 in the casing 1.

[0027] The outer periphery of the main shaft 5 is provided with a mounting groove, and the axial rotor disk 6 is fixedly sleeved into the mounting groove through the rotor lock nut 12, and first gaskets 11 are respectively provided on both sides of the axial rotor disk 6, one side of the first gasket 11 abuts against the mounting groove wall or one end of the shaft lock nut, and the first gasket 11 is a hollow cylindrical structure, and the staff can meet different installation conditions by adjusting the thickness of the first gasket 11. The axial positioning assembly has a simple structure, is stable and reliable, and can withstand the high-speed output of a high-power motor.

[0028] The magnetic component is an axial bearing coil 8 , and each group of axial bearing coils 8 is fixedly connected to the inner ring of the housing 1 through an axial positioning sleeve 7 .

[0029] The axial locating sleeve 7 is a hollow cylindrical structure. The main shaft 5 is located in the inner ring of the axial locating sleeve 7. One end of the axial locating sleeve 7 is fixedly connected to the inner ring of the casing 1 through the end cover 2 or the fixed cover plate 10. The other end of the axial locating sleeve 7 is provided with an annular groove. The axial bearing coil 8 is installed in the annular groove through the coil lock nut 9. A gap is provided between the two coil lock nuts 9, and the axial rotor disk 6 is located in the gap. The width of the gap is greater than the thickness of the axial rotor disk 6. The main shaft 5 can drive the axial rotor disk 6 to float in the gap. The axial rotor disk 6 is hard-limited by the two coil lock nuts 9. After the axial bearing coil 8 passes through, the axial rotor disk 6 and the main shaft 5 can be driven to move axially through magnetic attraction, so as to adjust the relative position of the main shaft 5 in the casing 1, so as to facilitate the staff to control the axial position of the main shaft 5.

[0030] The main stator 3 is fixedly installed on the inner ring of the casing 1, and the end covers 2 are covered at both ends of the casing 1. A through hole is provided in the middle of the end cover 2. The periphery of the main shaft 5 is located in the through hole, and the inner diameter of the through hole is larger than the outer diameter of the main shaft 5. An annular groove is provided on the periphery of the main shaft 5, and the main rotor 4 is installed in the annular groove. The main rotor 4 is located on the inner ring of the main stator 3, and a gap is provided between the main rotor 4 and the main stator 3. No bearing is arranged between the main shaft 5 and the casing 1, so as to avoid energy loss caused by bearing friction, improve energy conversion efficiency, reduce transmission components, and reduce product cost.

[0031] The main stator 3 includes a plurality of first magnetic steels 42 and a fixed sleeve 41. The plurality of first magnetic steels 42 are arranged along the circumference of the annular groove. The first magnetic steels 42 are permanent magnets of the prior art. The inner ring of the fixed sleeve 41 is fixedly sleeved to the outer ring of the main shaft 5, and the upper end of each first magnetic steel 42 abuts against the inner ring of the fixed sleeve 41, and the lower end of the first magnetic steel 42 abuts against the periphery of the main shaft 5. The first magnetic steel 42 is fixed to the outer ring of the main shaft 5 by the fixed sleeve 41. Compared with the traditional process of welding both ends of solid magnetic steel, the surface mounting process saves more permanent magnet materials. Since most of the stress of the rotor is concentrated on the motor shaft, the permanent magnets of the rotor can be segmented, which can reduce the skin effect and reduce the loss. The thickness of the sleeve can be more conveniently adjusted to adjust the motor air gap, which is convenient for the development of high-speed motors in various applications. In addition, there is no need to weld the two ends of the fixed sleeve 41, which solves the risks of deformation, stress concentration, and open welding caused by welding.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic suspension motor rotor axial positioning structure, mounted to the periphery of a main shaft (5), characterized in that: The invention comprises an axial rotor disk (6), and the axial rotor disk (6) is fixedly sleeved on the outer periphery of the main shaft (5), a magnetic attraction component is respectively arranged on both sides of the axial rotor disk (6), and each magnetic attraction component is fixedly connected to the inner ring of the casing (1), and the two magnetic attraction components are used for magnetically positioning the axial relative position of the main shaft (5) in the casing (1).

2. The magnetic suspension motor rotor axial positioning structure according to claim 1, characterized in that: A mounting groove is arranged on the periphery of the main shaft (5), and the axial rotor disk (6) is fixedly sleeved into the mounting groove through a rotor lock nut (12), and first gaskets (11) are arranged on both sides of the axial rotor disk (6), and one side of the first gasket (11) abuts against a wall of the mounting groove or one end of the shaft lock nut.

3. The magnetic suspension motor rotor axial positioning structure according to claim 2, characterized in that: The first gasket (11) is a hollow cylindrical structure.

4. The magnetic suspension motor rotor axial positioning structure according to claim 1, characterized in that: The magnetic component is an axial bearing coil (8), and each group of axial bearing coils (8) is fixedly connected to the inner ring of the housing (1) through an axial positioning sleeve (7).

5. The magnetic suspension motor rotor axial positioning structure according to claim 4, characterized in that: The axial positioning sleeve (7) is a hollow cylindrical structure. The main shaft (5) is located in the inner ring of the axial positioning sleeve (7). One end of the axial positioning sleeve (7) is fixedly connected to the inner ring of the casing (1) through an end cover (2) or a fixed cover plate (10). The other end of the axial positioning sleeve (7) is provided with an annular groove. The axial bearing coil (8) is installed in the annular groove through a coil lock nut (9). A gap is provided between the two coil lock nuts (9), and the axial rotor disk (6) is located in the gap.

6. The magnetic suspension motor rotor axial positioning structure according to claim 5, characterized in that: The width of the gap is greater than the thickness of the axial rotor disk (6), and the main shaft (5) can drive the axial rotor disk (6) to float in the gap.

7. The magnetic suspension motor rotor axial positioning structure according to claim 1, characterized in that: The main stator (3) is fixedly mounted on the inner ring of the casing (1), and the two ends of the casing (1) are covered with end covers (2). A through hole is provided in the middle of the end cover (2), and the periphery of the main shaft (5) is located in the through hole. An annular groove is provided on the periphery of the main shaft (5), and the main rotor (4) is installed in the annular groove.

8. The magnetic suspension motor rotor axial positioning structure according to claim 7, characterized in that: The main rotor (4) comprises a plurality of first magnetic steels (42) and a fixed sleeve (41), wherein the plurality of first magnetic steels (42) are arranged along the circumference of the annular groove, the inner ring of the fixed sleeve (41) is fixedly sleeved to the outer ring of the main shaft (5), and the upper end of each first magnetic steel (42) is abutted to the inner ring of the fixed sleeve (41), and the lower end of the first magnetic steel (42) is abutted to the outer periphery of the main shaft (5).

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