A high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system

Abstract

The application discloses a kind of high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system, including rotor shaft, permanent magnet, pressure sensor, sensor wire, rotating slip ring and data acquisition component, permanent magnet is sleeved on rotor shaft, pressure sensor is installed in the outer wall of rotor shaft, pressure sensor is connected with one end of sensor wire, the other end of sensor wire is connected with rotating slip ring, rotating slip ring is sleeved on rotor shaft, and rotating slip ring is connected with data acquisition component.The monitoring system disclosed in the application, pressure sensor connects sensor wire, sensor wire connects rotating slip ring, data acquisition component connects rotating slip ring, during the normal operation of surface-mounted high-speed permanent magnet motor, data acquisition component acquires pressure sensor pressure value is zero, it indicates that permanent magnet has no pressure to pressure sensor, i.e.permanent magnet and pressure sensor are separated, and data acquisition component acquires pressure sensor pressure value is not zero, then permanent magnet and rotor shaft are normal operation.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of high-speed motors, in particular to a high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system. BACKGROUND

[0002] Surface-mounted high-speed permanent magnet motors have become an important development direction of high-speed motors and a research hotspot in the field of high-speed motors at home and abroad due to the advantages of high power density, small size, high efficiency and the like.

[0003] The rotor shaft and permanent magnet of a surface-mounted high-speed permanent magnet motor are protected by a rotor core sheath after being assembled together, and have the advantage of high air gap magnetic density. However, under the action of high-speed rotating load, the permanent magnet will bear a large centrifugal force, which easily leads to the separation of the rotor shaft and the permanent magnet of the surface-mounted high-speed permanent magnet motor, aggravates the imbalance of the rotor, causes the stator and the rotor to rub, and leads to the destruction of the rotor.

[0004] Therefore, how to avoid the separation of the rotor shaft and the permanent magnet of the surface-mounted high-speed permanent magnet motor during operation is a technical problem to be solved by those skilled in the art. SUMMARY

[0005] The application aims to provide a high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system, which realizes the monitoring of the radial position of the permanent magnet of the surface-mounted high-speed permanent magnet motor by detecting the radial pressure of the permanent magnet of the surface-mounted high-speed permanent magnet motor, and achieves the monitoring of whether the rotor shaft and the permanent magnet are separated during the operation of the surface-mounted high-speed permanent magnet motor.

[0006] To solve the above technical problem, the application provides a high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system, which comprises a rotor shaft, a permanent magnet, a pressure sensor, a sensor lead, a rotating slip ring and a data acquisition component, the permanent magnet is sleeved on the rotor shaft, the pressure sensor is installed in the outer peripheral wall of the rotor shaft, one end of the pressure sensor is connected with the sensor lead, the other end of the sensor lead is connected with the rotating slip ring, the rotating slip ring is sleeved on the rotor shaft, and the rotating slip ring is connected with the data acquisition component.

[0007] Preferably, the rotor shaft is provided with a mounting hole for mounting the pressure sensor.

[0008] Preferably, the pressure sensor is in radial gap fit with the mounting hole, and the maximum gap between the pressure sensor and the mounting hole is less than 0.1 mm.

[0009] Preferably, a spring abutting against the bottom of the pressure sensor is arranged in the mounting hole.

[0010] Preferably, a collar for fixing the top of the sensor wire is arranged in the mounting hole.

[0011] Preferably, the spring is a butterfly spring.

[0012] Preferably, a wire groove for mounting the sensor wire is arranged in the rotor shaft and along the axial direction thereof, and the mounting hole is in communication with the wire groove.

[0013] Preferably, the number of the pressure sensors is at least two, and the pressure sensors are arranged along the axial direction of the rotor shaft.

[0014] Preferably, the top detection end surface of the pressure sensor coincides with the surface of the rotor shaft.

[0015] Preferably, a rotor core sheath is arranged on the outer periphery of the permanent magnet.

[0016] The high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system provided by the application comprises a rotor shaft, a permanent magnet, a pressure sensor, a sensor wire, a rotating slip ring and a data acquisition component, the permanent magnet is sleeved on the rotor shaft, the pressure sensor is installed in the outer peripheral wall of the rotor shaft, one end of the pressure sensor is connected with the sensor wire, the other end of the sensor wire is connected with the rotating slip ring, the rotating slip ring is sleeved on the rotor shaft, and the rotating slip ring is connected with the data acquisition component. The monitoring system disclosed in the application connects the pressure sensor to one end of the sensor wire, connects the other end of the sensor wire to the rotating slip ring, connects the data acquisition component with the rotating slip ring, installs the pressure sensor in the outer peripheral wall of the rotor shaft, and sleeves the permanent magnet on the rotor shaft, while ensuring that the pressure sensor can contact the permanent magnet and ensuring that the data transmitted by the pressure sensor to the data acquisition component through the sensor wire is not zero, that is, ensuring that the permanent magnet has pressure on the pressure sensor. By monitoring whether the pressure value of the pressure sensor collected by the data acquisition component is zero during the normal operation of the surface-mounted high-speed permanent magnet motor, it is determined whether the rotor shaft of the surface-mounted high-speed permanent magnet motor contacts the permanent magnet. If the pressure value of the pressure sensor collected by the data acquisition component is zero, it indicates that the permanent magnet has no pressure on the pressure sensor, that is, the permanent magnet is separated from the pressure sensor, at this time, the surface-mounted high-speed permanent magnet motor needs to be stopped running to avoid the permanent magnet and the rotor shaft from being swept. If the pressure value of the pressure sensor collected by the data acquisition component is not zero, it indicates that the permanent magnet is in normal contact with the pressure sensor, and it can be determined that the permanent magnet and the rotor shaft are in normal operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only aim at the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings.

[0018] Figure 1 A schematic diagram of the overall structure of a specific embodiment provided by the present application is shown in the figure.

[0019] Figure 2 A sectional view of the structure shown in the figure is shown in the figure. Figure 1

[0020] Figure 3 A sectional view of the rotor shaft shown in the figure is shown in the figure. Figure 1

[0021] Figure 4 A partial enlarged view of the structure shown in the figure is shown in the figure. Figure 2 Among them,

[0022] Among them: Figures 1-4

[0023] Rotor shaft - 1, mounting hole - 101, wire slot - 102, permanent magnet - 2, pressure sensor - 3, sensor wire - 4, rotating slip ring - 5, data acquisition component - 6, spring - 7, collar - 8, rotor core sheath - 9. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0025] Please refer to Figures 1 to 4 , Figure 1 A schematic diagram of the overall structure of a specific embodiment provided by the present application is shown in the figure. Figure 2 A sectional view of the structure shown in the figure is shown in the figure. Figure 1 A sectional view of the rotor shaft shown in the figure is shown in the figure. Figure 3 A sectional view of the rotor shaft shown in the figure is shown in the figure. Figure 1 A sectional view of the structure shown in the figure is shown in the figure. Figure 4 A sectional view of the structure shown in the figure is shown in the figure. Figure 1 A sectional view of the structure shown in the figure is shown in the figure.

[0026] ​​​In a specific embodiment provided by the application, mainly comprising a rotor shaft 1, a permanent magnet 2, a pressure sensor 3, a sensor lead wire 4, a rotating slip ring 5 and a data acquisition component 6, the permanent magnet 2 is sleeved on the rotor shaft 1, the pressure sensor 3 is installed in the outer peripheral wall of the rotor shaft 1, the pressure sensor 3 is connected with one end of the sensor lead wire 4, the other end of the sensor lead wire 4 is connected with the rotating slip ring 5, the rotating slip ring 5 is sleeved on the rotor shaft 1, and the rotating slip ring 5 is connected with the data acquisition component 6.

[0027] In the application, the permanent magnet 2 is sleeved on the rotor shaft 1, the pressure sensor 3 is installed in the outer peripheral wall of the rotor shaft 1, the pressure sensor 3 is used for detecting the radial pressure of the permanent magnet 2, the pressure sensor 3 is connected with one end of the sensor lead wire 4, the other end of the sensor lead wire 4 is connected with the rotating slip ring 5, the sensor lead wire 4 is used for transmitting the radial pressure value of the permanent magnet 2 detected by the pressure sensor 3 to the rotating slip ring 5, the rotating slip ring 5 is sleeved on the rotor shaft 1, and the rotating slip ring 5 is connected with the data acquisition component 6, and the data acquisition component 6 is used for acquiring the radial pressure of the permanent magnet 2 of the rotating slip ring 5.

[0028] Specifically, in the actual application process, the pressure sensor 3 is connected with one end of the sensor lead wire 4, the other end of the sensor lead wire 4 is connected to the rotating slip ring 5, the data acquisition component 6 is connected with the rotating slip ring 5, the pressure sensor 3 is installed in the outer peripheral wall of the rotor shaft 1, the permanent magnet 2 is sleeved on the rotor shaft 1, at the same time, it is ensured that the pressure sensor 3 can contact the permanent magnet 2, and it is ensured that the data transmitted by the pressure sensor 3 to the data acquisition component 6 through the sensor lead wire 4 is not zero, that is, it is ensured that the permanent magnet 2 has pressure on the pressure sensor 3, by monitoring whether the pressure value of the pressure sensor 3 acquired by the data acquisition component 6 is zero in the normal operation process of the surface-mounted high-speed permanent magnet motor, whether the rotor shaft 1 of the surface-mounted high-speed permanent magnet motor and the permanent magnet 2 are in contact is judged, if the pressure value of the pressure sensor 3 acquired by the data acquisition component 6 is zero, it indicates that the permanent magnet 2 has no pressure on the pressure sensor 3, that is, the permanent magnet 2 is separated from the pressure sensor 3, at this time, the surface-mounted high-speed permanent magnet motor needs to be stopped running to avoid the permanent magnet 2 and the rotor shaft 1 from sweeping the hall, if the pressure value of the pressure sensor 3 acquired by the data acquisition component 6 is not zero, it indicates that the permanent magnet 2 is in normal contact with the pressure sensor 3, then it can be determined that the permanent magnet 2 and the rotor shaft 1 are in normal operation.

[0029] The fixing of the pressure sensor 3 is described in detail below. The rotor shaft 1 is provided with a mounting hole 101 for mounting the pressure sensor 3. The pressure sensor 3 is in radial clearance fit with the mounting hole 101, and the maximum clearance between the pressure sensor 3 and the mounting hole 101 is less than 0.1 mm. A spring 7 is arranged in the mounting hole 101 and abuts against the bottom of the pressure sensor 3. The surface-mounted high-speed permanent magnet motor rotor shaft 1 is provided with a mounting hole 101 for placing the pressure sensor 3. The depth of the mounting hole 101 is consistent with the height of the assembled collar 8, pressure sensor 3 and spring 7. It is necessary to ensure that the top detection end surface of the pressure sensor 3 coincides with the surface of the rotor shaft 1. The mounting hole 101 is in radial clearance fit with the pressure sensor 3, and the maximum clearance is 0.1 mm. The spring 7 is a butterfly spring.

[0030] Further, the surface-mounted high-speed permanent magnet motor rotor shaft 1 is provided with an axial mounting hole 101 for conveniently leading out the pressure sensor lead wire 4. The rotor shaft 1 is further provided with a wire slot 102 for mounting the sensor lead wire 4 along the axial direction thereof. The mounting hole 101 communicates with the wire slot 102. The sensor lead wire 4 extends to the rotating part of the rotating slip ring 5 through the wire slot 102. The stationary part of the rotating slip ring 5 is mounted outside the rotating part of the rotating slip ring 5. The stationary part of the rotating slip ring 5 communicates with the data acquisition component 6. The data acquisition component 6 acquires the pressure value transmitted to the stationary part of the rotating slip ring 5.

[0031] It should be noted that the pressure sensor 3 is placed in the mounting hole 101 of the high-speed permanent magnet motor rotor shaft 1 which is processed by a lathe. The bottom of the pressure sensor 3 is connected to the bottom surface of the mounting hole 101 through the spring 7. The collar 8 is arranged to limit the pressure sensor 3 to avoid radial displacement of the pressure sensor 3 outward during high-speed rotation,

[0032] Further, the number of pressure sensors 3 is at least two, and the pressure sensors 3 are arranged along the axial direction of the rotor shaft 1. Two pressure sensors 3 arranged along the axial direction of the rotor shaft 1 can monitor different positions of the permanent magnet 2, improve the accuracy of monitoring pressure, avoid the situation that the pressure sensor 3 is damaged and cannot normally transmit pressure, and ensure the accuracy of real-time monitoring.

[0033] Finally, the permanent magnet 2 is provided with a rotor core sheath 9. The rotor core sheath 9 protects the rotor. The metal sheath adopts a hot sheath process, and the composite material sheath adopts a winding process or a cold pressing process.

[0034] In summary, the high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system provided by the embodiment mainly comprises a rotor shaft, a permanent magnet, a pressure sensor, a sensor lead wire, a rotating slip ring and a data acquisition component, the permanent magnet is sleeved on the rotor shaft, the pressure sensor is installed in the outer peripheral wall of the rotor shaft, one end of the pressure sensor is connected with the sensor lead wire, the other end of the sensor lead wire is connected with the rotating slip ring, the rotating slip ring is sleeved on the rotor shaft, and the rotating slip ring is connected with the data acquisition component. The monitoring system disclosed in the application connects the pressure sensor to one end of the sensor lead wire, connects the other end of the sensor lead wire to the rotating slip ring, connects the data acquisition component with the rotating slip ring, installs the pressure sensor in the outer peripheral wall of the rotor shaft, and sleeves the permanent magnet on the rotor shaft, so that the pressure sensor can contact the permanent magnet, and the data transmitted by the pressure sensor to the data acquisition component through the sensor lead wire is not zero, that is, the permanent magnet has pressure on the pressure sensor. By monitoring whether the pressure value of the pressure sensor collected by the data acquisition component is zero during the normal operation of the surface-mounted high-speed permanent magnet motor, whether the rotor shaft of the surface-mounted high-speed permanent magnet motor contacts the permanent magnet is determined. If the pressure value of the pressure sensor collected by the data acquisition component is zero, it indicates that the permanent magnet has no pressure on the pressure sensor, that is, the permanent magnet is separated from the pressure sensor, at this time, the surface-mounted high-speed permanent magnet motor needs to be stopped running to avoid the permanent magnet and the rotor shaft from being swept.

[0035] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A monitoring system for the contact state between the rotor shaft and the permanent magnet of a high-speed permanent magnet motor, characterized in that, The device includes a rotor shaft (1), a permanent magnet (2), a pressure sensor (3), a sensor wire (4), a rotating slip ring (5), and a data acquisition component (6). The permanent magnet (2) is mounted on the rotor shaft (1). The pressure sensor (3) is installed inside the outer peripheral wall of the rotor shaft (1). One end of the pressure sensor (3) is connected to the sensor wire (4), and the other end of the sensor wire (4) is connected to the rotating slip ring (5). The rotating slip ring (5) is mounted on the rotor shaft (1) and is connected to the data acquisition component (6). The rotor shaft (1) is provided with a mounting hole (101) for mounting the pressure sensor (3). The mounting hole (101) is also provided with a retaining ring (8) for fixing the top of the sensor wire (4); A spring (7) is provided inside the mounting hole (101) to abut against the bottom of the pressure sensor (3); The rotor shaft (1) is provided with a groove (102) for mounting the sensor wire (4) along its axial direction, and the mounting hole (101) is connected to the groove (102).

2. The high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system according to claim 1, characterized in that, The pressure sensor (3) is radially clearance fitted with the mounting hole (101), and the maximum gap between the pressure sensor (3) and the mounting hole (101) is less than 0.1 mm.

3. The high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system according to claim 1, characterized in that, The spring (7) is a butterfly spring.

4. The high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system according to any one of claims 2 to 3, characterized in that, The number of pressure sensors (3) is at least two, and the pressure sensors (3) are arranged axially along the rotor shaft (1).

5. The high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system according to claim 4, characterized in that, The top detection end face of the pressure sensor (3) coincides with the surface of the rotor shaft (1).

6. The high-speed permanent magnet motor rotor shaft and permanent magnet contact state monitoring system according to claim 3, characterized in that, The permanent magnet (2) is provided with a rotor core sheath (9) on its outer periphery.

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