Bearingless motor

Abstract

The utility model provides a bearingless motor, which is characterized in that a stator assembly is sleeved on the inner ring of a shell, a main rotor is arranged outside a middle shaft, the main rotor is positioned on the inner ring of the stator assembly, an axial positioning assembly is arranged on the shell, the axial positioning assembly is used for adjusting the axial relative positions of the middle shaft, the main rotor and the stator assembly, and a radial detection assembly is arranged on the shell. The radial detection assembly is used for detecting the concentricity of the stator assembly and the main rotor. According to the bearingless motor provided by the utility model, the axial relative position between the middle shaft and the shell is limited through the axial positioning assembly, the middle shaft is prevented from moving in the shell, and the concentricity between the middle shaft and the shell is detected in real time through the radial detection assembly, so that the stable output of the middle shaft is ensured, and the damage of the device caused by the movement of the middle shaft is prevented; the middle shaft can be limited without additionally arranging a bearing between the shell and the middle shaft, energy consumption caused by friction of transmission parts is reduced, the output efficiency of the middle shaft is improved, and the device is simple in structure and easy to implement.

Description

Technical Field

[0001] The utility model belongs to the field of motors, and in particular relates to a bearingless 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 prior art, there is a problem of axial movement during the movement of the mover due to the contactless operation between the stator and the mover, which will cause equipment abnormality or damage. If bearings are added to limit the relative position between the stator and the mover, there is a problem of transmission components affecting the output of the main shaft due to inadequate lubrication or wear of parts. Utility Model Content

[0003] In view of this, the utility model aims to provide a bearingless motor to solve the problem that if no bearing is added between the central shaft and the housing of the prior art motor, the central shaft will move, and adding a bearing will affect the output efficiency of the central shaft.

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

[0005] A bearingless motor comprises a shell, a central shaft, a stator assembly, a main rotor, an axial positioning component and a radial detection component. The shell is arranged on the periphery of the central shaft, and the stator assembly is sleeved in the inner ring of the shell. The main rotor is arranged outside the central shaft, and the main rotor is located in the inner ring of the stator assembly. The shell is provided with an axial positioning component, which is used to adjust the axial relative position of the central shaft, the main rotor and the stator assembly. The shell is provided with a radial detection component, which is used to check the concentricity of the stator assembly and the main rotor.

[0006] Furthermore, the main rotor includes a permanent magnet, and a central axis is respectively arranged at both ends of the permanent magnet, the two central axes are arranged opposite to each other, and the periphery of the permanent magnet is fixedly connected to one end of a central axis through a sleeve.

[0007] Furthermore, an axial positioning assembly is respectively provided at both ends of the sleeve, and each axial positioning assembly includes two permanent magnet rings. A permanent magnet ring is respectively fixedly installed on the inner ring of one end of the sleeve and one end of the outer shell. The permanent magnet ring is concentrically arranged with the sleeve and the outer shell, and a gap is provided between the two permanent magnet rings.

[0008] Furthermore, the radial detection component is a positioning sensor, and the positioning sensor is used to detect the concentricity between the radial positioning component and the main shaft.

[0009] 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 outer shell, the sensor winding coil is arranged on the sensor stator core, the outer periphery of the central axis is fixedly sleeved on 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.

[0010] Furthermore, an end cover is installed at each end of the shell, and the central axis is located at the inner circle of the end cover, the sensor stator core is fixedly connected to the outer side of the end cover, and a permanent magnet ring is fixedly installed on the inner side of the end cover and one end of the sheath.

[0011] Compared with the prior art, the bearingless motor described in the utility model has the following beneficial effects: the axial relative position between the central axis and the outer shell is limited by an axial positioning component to prevent the central axis from moving in the outer shell; the concentricity between the central axis and the outer shell is detected in real time by a radial detection component to ensure stable output of the central axis and prevent damage to the device due to movement of the central axis; the central axis can be limited without installing bearings between the outer shell and the central axis, thereby reducing energy loss caused by friction of transmission components and improving the output efficiency of the central axis; the device has a simple structure and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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:

[0013] Figure 1 A cross-sectional schematic diagram of a bearingless motor according to an embodiment of the utility model;

[0014] Figure 2 It is a cross-sectional schematic diagram of the assembly of the central shaft and the main rotor described in an embodiment of the utility model.

[0015] Figure 3 for Figure 1 A partial enlarged view of middle A.

[0016] Description of reference numerals:

[0017] 1-housing; 2-central shaft; 3-stator assembly; 4-main rotor; 41-permanent magnet; 42-sheath; 5-axial positioning assembly; 51-permanent magnet ring; 6-radial detection assembly; 61-sensor rotor core; 62-sensor lock nut; 63-sensor winding coil; 64-sensor stator core; 7-impeller; 8-end cover. DETAILED DESCRIPTION

[0018] 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.

[0019] 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.

[0020] 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.

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0022] like Figure 1-Figure 3 As shown, a bearingless motor includes a housing 1, a central shaft 2, a stator assembly 3, a main rotor 4, an axial positioning component 5 and a radial detection component 6. The housing 1 is arranged outside the central shaft 2, and the stator assembly 3 is sleeved in the inner ring of the housing 1. The main rotor 4 is arranged outside the central shaft 2, and the main rotor 4 is located in the inner ring of the stator assembly 3. The housing 1 is provided with an axial positioning component 5, and the axial positioning component 5 is used to adjust the axial relative position of the central shaft 2, the main rotor 4 and the stator assembly 3. The housing 1 is provided with a radial detection component 6, and the radial detection component 6 is used for the stator assembly 3 and the concentricity of the main rotor 4, the axial relative position between the central axis 2 and the outer shell 1 is limited by the axial positioning component 5 to prevent the central axis 2 from moving in the outer shell 1, and the concentricity between the central axis 2 and the outer shell 1 is detected in real time by the radial detection component 6 to ensure the stable output of the central axis 2 and prevent the device from being damaged due to the movement of the central axis 2. The central axis 2 can be limited without installing a bearing between the outer shell 1 and the central axis 2, which reduces the energy loss caused by the friction of the transmission parts and improves the output efficiency of the central axis 2. The device has a simple structure and is easy to implement.

[0023] Since it is difficult for a mechanical bearing motor to achieve a high speed, and the life of the air bearing is difficult to guarantee, the magnetic bearing of the traditional magnetic levitation motor has a complex structure and a large volume, which increases the axial length of the motor and reduces the yield strength of the main rotor 4. The bearingless motor described in this embodiment, such as Figure 1 As shown, since high-speed motors generally have fewer stages and larger spans, the slot fill rate of the core is generally not high, which can improve the utilization rate of the core. The stator assembly 3 of this embodiment includes a main shaft stator core, and the two ends of the main shaft stator core are wound with magnetic suspension coils. The main shaft stator core is added with magnetic suspension coils, and the position of the main rotor 4 is controlled by the axial main shaft stator core. This structure can greatly shorten the length of the motor, reduce the use of materials, make the motor body structure simple and easy to install and process, increase the yield strength of the main rotor 4, increase the motor speed, and increase the motor power density.

[0024] The main rotor 4 includes a permanent magnet 41, and a central axis 2 is respectively arranged at both ends of the permanent magnet 41, and the two central axes 2 are arranged opposite to each other. The periphery of the permanent magnet 41 is fixedly connected to one end of a central axis 2 through a sleeve 42, and an axial positioning component 5 is respectively arranged at both ends of the sleeve 42, and each axial positioning component 5 includes two permanent magnet rings 51, and a permanent magnet ring 51 is fixedly installed on one end of the sleeve 42 and the inner ring of one end of the shell 1 respectively. The permanent magnet ring 51 is concentrically arranged with the sleeve 42 and the shell 1, and a gap is provided between the two permanent magnet rings 51. According to the same-level repulsion characteristics of the two oppositely arranged permanent magnet rings 51, the axial position of the central axis 2 in the shell 1 is adjusted. This structure is simple in structure, low in cost, safe and reliable, and can be adjusted through magnetic self-adaptation without human control.

[0025] The radial detection component 6 is a positioning sensor, which is used to detect the concentricity of the radial positioning component and the main shaft. The positioning sensor can be selected from existing technologies, or it can be as follows Figure 3 As shown, the positioning sensor includes a sensor rotor core 61, a sensor lock nut 62, a sensor winding coil 63 and a sensor stator core 64. The sensor stator core 64 is fixedly connected to one end of the housing 1. The sensor winding coil 63 is arranged on the sensor stator core 64. The outer periphery of the central axis 2 is fixedly sleeved with the sensor rotor core 61 through the sensor lock nut 62, and the sensor rotor core 61 is located in the inner circle of the sensor stator core 64. 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 detects the position of the main rotor 4 due to the different voltages induced by the change in the position of the sensor rotor core 61. 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 61 will not be changed, which can reduce costs, facilitate installation, and increase reliability.

[0026] An end cover 8 is installed at each end of the shell 1, and the central axis 2 is located at the inner ring of the end cover 8. The sensor stator core 64 is fixedly connected to the outer side of the end cover 8, and a permanent magnet ring 51 is fixedly installed on the inner side of the end cover 8 and one end of the sleeve 42. The end cover 8 is used to facilitate the installation and maintenance of the radial detection component 6 and the axial positioning component 5.

[0027] 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 bearingless motor, characterized in that: The invention comprises an outer shell (1), a central shaft (2), a stator assembly (3), a main rotor (4), an axial positioning component (5) and a radial detection component (6); the outer shell (1) is arranged on the periphery of the central shaft (2), and the stator assembly (3) is sleeved on the inner ring of the outer shell (1); the main rotor (4) is arranged outside the central shaft (2), and the main rotor (4) is located on the inner ring of the stator assembly (3); the outer shell (1) is provided with an axial positioning component (5), and the axial positioning component (5) is used to adjust the axial relative position of the central shaft (2), the main rotor (4) and the stator assembly (3); the outer shell (1) is provided with a radial detection component (6), and the radial detection component (6) is used to check the concentricity of the stator assembly (3) and the main rotor (4).

2. A bearingless motor according to claim 1, characterized in that: The main rotor (4) comprises a permanent magnet (41), and a central shaft (2) is respectively arranged at both ends of the permanent magnet (41), the two central shafts (2) are arranged opposite to each other, and the periphery of the permanent magnet (41) is respectively fixedly connected to one end of a central shaft (2) through a sheath (42).

3. A bearingless motor according to claim 2, characterized in that: An axial positioning assembly (5) is respectively arranged at both ends of the sleeve (42), and each axial positioning assembly (5) comprises two permanent magnetic rings (51). One end of the sleeve (42) and the inner ring of one end of the outer shell (1) are respectively fixedly mounted with a permanent magnetic ring (51). The permanent magnetic ring (51) is arranged concentrically with the sleeve (42) and the outer shell (1), and a gap is arranged between the two permanent magnetic rings (51).

4. The bearingless motor according to claim 1, characterized in that: The radial detection component (6) is a positioning sensor, and the positioning sensor is used to detect the concentricity between the radial positioning component and the main shaft.

5. A bearingless motor according to claim 4, characterized in that: The positioning sensor comprises a sensor rotor core (61), a sensor lock nut (62), a sensor winding coil (63) and a sensor stator core (64); the sensor stator core (64) is fixedly connected to one end of the housing (1); the sensor winding coil (63) is arranged on the sensor stator core (64); the outer periphery of the central axis (2) is fixedly sleeved on the sensor rotor core (61) through the sensor lock nut (62); and the sensor rotor core (61) is located in the inner ring of the sensor stator core (64).

6. A bearingless motor according to claim 5, characterized in that: An end cover (8) is respectively installed at both ends of the housing (1), and the central axis (2) is located at the inner ring of the end cover (8). The sensor stator core (64) is fixedly connected to the outer side of the end cover (8), and a permanent magnet ring (51) is respectively fixedly installed on the inner side of the end cover (8) and one end of the sheath (42).

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