High-speed motor structure

Abstract

The utility model provides a high-speed motor structure, which comprises a casing, a main stator, a main rotor and a main shaft, the main stator is fixedly mounted on an inner ring of the casing, end covers are covered at two ends of the casing, a through hole is arranged in the middle of each end cover, the periphery of the main shaft is positioned in the through hole, the inner diameter of each through hole is larger than the outer diameter of the main shaft, and a ring groove is arranged on the periphery of the main shaft. The main rotor is installed in the annular groove and located on the inner ring of the main stator, and a gap is formed between the main rotor and the main stator. According to the high-speed motor structure, the inner diameter of the through hole is larger than the outer diameter of the main shaft, the gap is arranged between the main rotor and the main stator, and no bearing is arranged between the main shaft and the casing, so that energy loss caused by bearing friction is avoided, the energy conversion rate is improved, transmission parts are reduced, and the product cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of high-speed motors, and in particular relates to a high-speed motor structure. Background Art

[0002] High-speed motors usually refer to motors with speeds exceeding 10,000 r / min. They have high speeds, are much smaller than ordinary power motors, are connected to the prime mover, eliminate the traditional reduction mechanism, and have small rotational inertia. Therefore, they have the advantages of high motor power density, effective material saving, high transmission efficiency, low noise, and fast dynamic response. When high-speed motors in the prior art are used, in order to avoid the transmission components reducing the speed of the spindle, the spindle shaft end is usually connected to the housing through an angular contact ball bearing. However, due to inadequate lubrication or wear of parts, there is still a problem that the transmission components affect the spindle output. Utility Model Content

[0003] In view of this, the utility model aims to propose a high-speed motor structure to solve the problem that the high-speed motor in the prior art locates the relative position of the main shaft and the casing through bearings, and the transmission components such as bearings lose energy, thereby reducing the transmission speed.

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

[0005] A high-speed motor structure comprises a casing, a main stator, a main rotor and a main shaft, wherein the main stator is fixedly mounted on the inner ring of the casing, and end covers are provided at both ends of the casing, a through hole is provided in the middle of the end cover, the periphery of the main shaft is located in the through hole, and the inner diameter of the through hole is larger than the outer diameter of the main shaft, an annular groove is provided on the periphery of the main shaft, the main rotor is installed in the annular groove, the main rotor is located in the inner ring of the main stator, and a gap is provided between the main rotor and the main stator.

[0006] 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.

[0007] Furthermore, a radial positioning assembly is installed in the casing, and the radial positioning assembly is used to adjust the concentricity between the main shaft, the main rotor and the main stator.

[0008] Furthermore, the radial positioning component is a magnetic bearing.

[0009] Furthermore, a positioning sensor is provided at one end of the radial positioning assembly, and the positioning sensor is used to detect the concentricity between the radial positioning assembly and the main shaft.

[0010] Furthermore, the positioning sensor includes a sensor rotor core, a sensor locking nut, a sensor winding coil and a sensor stator core. The sensor stator core is fixedly connected to one end of the radial positioning assembly. The sensor winding coil is arranged on the sensor stator core. The outer periphery of the main shaft is fixedly sleeved with the sensor rotor core through the sensor locking nut, and the sensor rotor core is located in the inner ring of the sensor stator core.

[0011] Compared with the prior art, the high-speed motor structure described in the utility model has the following beneficial effects:

[0012] (1) The utility model discloses a high-speed motor structure, wherein the inner diameter of the through hole is larger than the outer diameter of the main shaft, a gap is provided between the main rotor and the main stator, and no bearing is provided between the main shaft and the housing, thereby avoiding energy loss caused by bearing friction, improving energy conversion efficiency, reducing transmission components, and reducing product costs.

[0013] (2) The utility model discloses a high-speed motor structure in which the first magnetic steel is fixed to the outer ring of the main shaft by a fixing sleeve. Compared with the traditional process of welding the two ends of a solid magnetic steel, the surface mounting process saves more permanent magnet materials. Moreover, since most of the stress of the rotor is concentrated on the motor shaft, the permanent magnet of the rotor can be segmented, which can reduce the skin effect and loss. In addition, the thickness of the sleeve can be adjusted more conveniently to adjust the air gap of the motor, which is convenient for the development of high-speed motors in various applications. In addition, the two ends of the fixing sleeve do not need to be welded, which solves the risks of deformation, stress concentration, and open welding caused by welding.

[0014] (3) In the high-speed motor structure described in the utility model, there is a gap between the inner ring of the casing and the outer periphery of the main shaft, and concentric alignment is performed by a radial positioning assembly. In order to prevent the main shaft from deflecting, a radial positioning assembly is respectively provided at both ends of the main stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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:

[0016] Figure 1 A cross-sectional schematic diagram of a high-speed motor structure according to an embodiment of the utility model;

[0017] Figure 2 It is a cross-sectional schematic diagram of the main shaft and the main rotor according to the embodiment of the utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of the radial positioning assembly according to an embodiment of the utility model;

[0019] Figure 4 for Figure 3A partial enlarged view of middle A;

[0020] Figure 5 It is a cross-sectional schematic diagram of the axial positioning assembly described in an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1- housing; 2- end cover; 3- main stator; 4- main rotor; 41- fixed sleeve; 42- first magnetic steel; 5- main shaft; 6- axial positioning assembly; 61- axial rotor disk; 62- axial positioning sleeve; 63- axial bearing coil; 64- coil lock nut; 65- fixed cover plate; 66- first gasket; 67- rotor lock nut; 7- radial positioning assembly; 71- stator assembly; 72- rotor core; 73- bearing bracket; 74- core bracket; 75- stator lock nut; 76- adjustment sheet; 77- rotor positioning sleeve; 8- positioning sensor; 81- sensor rotor core; 82- sensor lock nut; 83- sensor winding coil; 84- sensor stator core. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0027] like Figure 1-Figure 5 As shown, a high-speed motor structure includes a casing 1, a main stator 3, a main rotor 4 and a main shaft 5. The main stator 3 is fixedly installed 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. 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.

[0028] The main rotor 4 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.

[0029] A radial positioning assembly 7 is installed in the casing 1. The radial positioning assembly 7 is used to adjust the concentricity between the main shaft 5, the main rotor 4 and the main stator 3. There is a gap between the inner ring of the casing 1 and the outer periphery of the main shaft 5. The radial positioning assembly 7 is used to perform concentric alignment and to prevent the main shaft 5 from deflecting. Figure 1 As shown, a radial positioning assembly 7 is respectively provided at both ends of the main stator 3 .

[0030] The radial positioning assembly 7 can be a magnetic bearing of the prior art, or a Figure 3 As shown, the radial positioning component 7 includes a stator assembly 71, which is a hollow cylindrical structure. The outer periphery of the stator assembly 71 is fixedly sleeved to the inner ring of the casing 1, and the outer periphery of the main shaft 5 is located in the inner ring of the stator assembly 71. The stator assembly 71 can magnetically attract or repel the main shaft 5. The stator assembly 71 attaches the main shaft 5 by magnetic attraction or magnetic repulsion so that the main shaft 5 is suspended in the inner ring of the casing 1, and the main shaft 5 is magnetically suspended in the inner ring of the stator assembly 71, thereby avoiding friction of the main shaft 5 caused by the mechanical transmission structure, wasting energy and damaging parts.

[0031] The rotor core 72 is fixedly sleeved on the periphery of the main shaft 5 , and the rotor core 72 is fixedly sleeved on the periphery of the main shaft 5 through a rotor positioning sleeve 77 , so that the staff can position and fix the rotor core 72 for easy installation.

[0032] The inner ring of the casing 1 is fixedly installed with the core bracket 74 through the bearing bracket 73, and the core bracket 74 is a barrel-shaped structure. A first through hole is provided in the middle of the core bracket 74, and the main shaft 5 is located in the first through hole. The stator assembly 71 is fixedly installed in the core bracket 74 through the stator lock nut 75. The core bracket 74 positions and fixes the stator assembly 71, so that the stator assembly 71 and the core bracket 74 form an installation module to protect the stator assembly 71 and facilitate installation by the staff.

[0033] An adjustment piece 76 is provided at one end of the stator assembly 71, and a stator lock nut 75 is located at the other end of the stator assembly 71. One end of the adjustment piece 76 abuts against the bottom of the barrel structure. The adjustment piece 76 is a hollow cylindrical structure. The adjustment piece 76 is used to adjust the relative position of the stator assembly 71 in the core bracket 74. The staff can meet different installation conditions by adjusting the thickness of the adjustment piece 76. The radial positioning assembly 7 has a simple structure, is stable and reliable, and can withstand the high-speed output of a high-power motor.

[0034] A positioning sensor 8 is provided at one end of the radial positioning assembly 7 , and the positioning sensor 8 is used to detect the concentricity between the radial positioning assembly 7 and the main shaft 5 .

[0035] The positioning sensor 8 includes a sensor rotor core 81, a sensor locking nut 82, a sensor winding coil 83 and a sensor stator core 84. The sensor stator core 84 is fixedly connected to one end of the radial positioning component 7. The sensor winding coil 83 is arranged on the sensor stator core 84. The outer periphery of the main shaft 5 is fixedly sleeved with the sensor rotor core 81 through the sensor locking nut 82, and the sensor rotor core 81 is located in the inner ring of the sensor stator core 84. Since traditional infrared and ultrasonic position sensors are expensive and too sensitive to the installation position, any slight mistake during operation and debugging requires re-debugging or even replacement of the sensor. The positioning sensor 8 detects the rotor position because the voltage induced by the change in the position of the sensor rotor core 81 is different. This structure is simple and reliable. Even if there is a slight bump during operation and debugging, the relative position of the stator sensor rotor core 81 will not be changed, which can reduce costs, facilitate installation and increase reliability.

[0036] An axial positioning assembly 6 is arranged on the periphery of the main shaft 5, and the axial positioning assembly 6 is used to locate the axial relative position of the main shaft 5 in the casing 1. The axial positioning assembly 6 includes an axial rotor disk 61, and the axial rotor disk 61 is fixedly sleeved to the periphery of the main shaft 5. A magnetic component is respectively arranged on both sides of the axial rotor disk 61, and each magnetic component is fixedly connected to the inner ring of the casing 1. The two magnetic components are used to magnetically locate the axial relative position of the main shaft 5 in the casing 1.

[0037] The outer periphery of the main shaft 5 is provided with a mounting groove, and the axial rotor disk 61 is fixedly sleeved into the mounting groove through a rotor lock nut 67, and first gaskets 66 are respectively provided on both sides of the axial rotor disk 61, one side of the first gasket 66 abuts against the mounting groove wall or one end of the shaft lock nut, and the first gasket 66 is a hollow cylindrical structure, and the staff can meet different installation conditions by adjusting the thickness of the first gasket 66. The axial positioning assembly 6 has a simple structure, is stable and reliable, and can withstand the high-speed output of a high-power motor.

[0038] The magnetic component is an axial bearing coil 63 , and each group of axial bearing coils 63 is fixedly connected to the inner ring of the housing 1 through an axial positioning sleeve.

[0039] The axial locating sleeve is a hollow cylindrical structure. The main shaft 5 is located in the inner ring of the axial locating sleeve. One end of the axial locating sleeve is fixedly connected to the inner ring of the casing 1 through the end cover 2 or the fixed cover plate 65. The other end of the axial locating sleeve is provided with an annular groove. The axial bearing coil 63 is installed in the annular groove through the coil lock nut 64. A gap is provided between the two coil lock nuts 64, and the axial rotor disk 61 is located in the gap. The width of the gap is greater than the thickness of the axial rotor disk 61. The main shaft 5 can drive the axial rotor disk 61 to float in the gap. The axial rotor disk 61 is hard-limited by the two coil lock nuts 64. After the axial bearing coil 63 passes through, the axial rotor disk 61 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.

[0040] 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 high-speed motor structure, characterized in that: The invention comprises a casing (1), a main stator (3), a main rotor (4) and a main shaft (5); the main stator (3) is fixedly mounted on the inner ring of the casing (1); and end covers (2) are sealed at both ends of the casing (1); a through hole is provided in the middle of the end cover (2); the outer 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 outer periphery of the main shaft (5); the main rotor (4) is mounted in the annular groove; the main rotor (4) is located in the inner ring of the main stator (3); and a gap is provided between the main rotor (4) and the main stator (3).

2. A high-speed motor structure according to claim 1, 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).

3. A high-speed motor structure according to claim 1, characterized in that: A radial positioning assembly (7) is installed in the casing (1), and the radial positioning assembly (7) is used to adjust the concentricity between the main shaft (5), the main rotor (4) and the main stator (3).

4. A high-speed motor structure according to claim 3, characterized in that: The radial positioning component (7) is a magnetic suspension bearing.

5. A high-speed motor structure according to claim 3, characterized in that: A positioning sensor (8) is provided at one end of the radial positioning component (7), and the positioning sensor (8) is used to detect the concentricity between the radial positioning component (7) and the main shaft (5).

6. A high-speed motor structure according to claim 5, characterized in that: The positioning sensor (8) comprises a sensor rotor core (81), a sensor lock nut (82), a sensor winding coil (83) and a sensor stator core (84); the sensor stator core (84) is fixedly connected to one end of the radial positioning assembly (7); the sensor winding coil (83) is arranged on the sensor stator core (84); the outer periphery of the main shaft (5) is fixedly sleeved with the sensor rotor core (81) through the sensor lock nut (82); and the sensor rotor core (81) is located in the inner ring of the sensor stator core (84).

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