CN216490121U

CN216490121U - Magnetic suspension motor rotor axial displacement detection structure

Info

Publication number: CN216490121U
Application number: CN202122605001.7U
Authority: CN
Inventors: 包金哲; 刘淑云; 吴立华; 董继勇
Original assignee: Nanjing Cigu Technology Co Ltd
Current assignee: Nanjing Cigu Technology Co Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-05-10
Anticipated expiration: 2031-10-28

Abstract

The utility model discloses an axial displacement detection structure of a magnetic suspension motor rotor, wherein an impeller is arranged at the end part of the rotor, the detection structure comprises an axial displacement sensor arranged on a rotor protection bearing pressing plate and an axial position detection disc sleeved on the rotor, and the axial position detection disc is tightly pressed between the impeller and a step surface arranged on the rotor and synchronously rotates with the rotor; a sealing ring for sealing between the axial position detection disc and the motor shell is arranged on the periphery of the axial position detection disc; the rotor protection bearing pressure plate is used as the mounting support of the axial displacement sensor, the outer circle serves as the sealing surface while the axial position detection disc is matched for displacement detection, one part has multiple purposes, the part is saved, the space is saved, the structure is compact, the using effect is good, and the structure that impellers are uniformly arranged at two ends of the rotor can be met.

Description

Magnetic suspension motor rotor axial displacement detection structure

Technical Field

The utility model relates to the technical field of magnetic suspension equipment, in particular to a structure for detecting axial displacement of a rotor of a magnetic suspension motor.

Background

In the existing magnetic suspension motor equipment used for magnetic suspension fans, air compressors, refrigeration compressors and the like, the axial displacement of a rotor needs to be detected so as to control the axial clearance between the rotor and a thrust magnetic bearing within a reasonable range, and for the structure of a single impeller, an axial displacement sensor is arranged at the end part of the rotor in a conventional mode, and the sensor is over against the central position of an axle end to detect the displacement of the rotor; but all set up the structure of impeller to the rotor both ends, this kind of structure can't be suitable for to set up sensor support isotructure alone inside the motor, occupy motor inner space, increased the installation degree of difficulty.

SUMMERY OF THE UTILITY MODEL

The technical purpose is as follows: the utility model discloses a magnetic suspension motor rotor axial displacement detection structure which can detect the axial displacement of a rotor with impellers arranged at two shaft ends without independently arranging a sensor support and aims to solve the problem that the existing magnetic suspension motor rotor displacement detection structure occupies the inner space of a motor and cannot be suitable for detecting the axial position of the rotor with the impellers arranged at two shaft ends of the rotor.

The technical scheme is as follows: in order to achieve the technical purpose, the utility model adopts the following technical scheme:

an axial displacement detection structure of a magnetic suspension motor rotor is characterized in that an impeller is arranged at the end part of the rotor, the detection structure comprises an axial displacement sensor arranged on a rotor protection bearing pressing plate and an axial position detection disc sleeved on the rotor, and the axial position detection disc is tightly pressed between the impeller and a step surface arranged on the rotor and rotates synchronously with the rotor; and a sealing ring for sealing between the axial position detection disc and the motor shell is arranged on the periphery of the axial position detection disc.

Preferably, a mounting groove for mounting the axial displacement sensor is formed in one side of the rotor protection bearing pressing plate, which is away from the axial position detection disc, a mounting hole penetrating through the rotor protection bearing pressing plate is formed in the mounting groove, the axial displacement sensor is fixed in the mounting hole, a circuit board electrically connected with the axial displacement sensor is further arranged in the mounting groove, a circle of wiring groove for wiring is formed in the rotor protection bearing pressing plate, pouring sealant is poured into the wiring groove, and the electric wire is fixed in the wiring groove through the pouring sealant.

Preferably, the wiring groove of the utility model adopts an annular design concentric with the rotor protection bearing, the glue blocking and wire passing block is arranged on the circumference of the wiring groove, the height of the glue blocking and wire passing block is equal to the height of the wiring groove, and the glue blocking and wire passing block is provided with a wire passing hole.

Preferably, the height of the pouring sealant is lower than the upper edge of the wiring groove.

Preferably, the sealing ring and the motor shell, and the rotor protection bearing pressing plate and the rotor protection bearing seat are fixed by screws.

Has the advantages that: the axial displacement detection structure of the magnetic suspension motor rotor provided by the utility model has the following beneficial effects:

1. the utility model is suitable for the rotor protection bearing pressure plate to be used as the support of the axial displacement sensor, a fixed support does not need to be arranged independently, the space is saved, the axial displacement of the rotor is detected through the axial position detection disc arranged between the rotor protection bearing pressure plate and the impeller, the utility model is also suitable for the structure of installing the impellers at two shaft ends, the structure is compact, the space is reduced, the number of parts is reduced, the part management is reduced, and the installation is convenient.

2. The rotor protection bearing pressure plate is provided with the mounting groove, the mounting groove is internally provided with the through mounting hole, and the rotor protection bearing pressure plate is provided with the annular wiring groove, so that wiring and positioning are facilitated when the axial displacement sensor is mounted.

3. The axial position detection disc is tightly pressed between the impeller and the step surface arranged on the rotor, the sealing ring is arranged on the periphery of the axial displacement detection disc, and the outer circle of the axial position detection disc is used as a sealing surface.

4. According to the utility model, the glue blocking and wire passing block is arranged in the wire distributing groove, and the wire passing hole for passing the electric wire is arranged on the glue blocking and wire passing block, so that the phenomenon that the circuit protrudes out of the rotor to protect the bearing pressing plate, and is influenced by the bearing to cause damage and influence on signal transmission is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a cross-sectional view of the present invention taken along the axial direction of the rotor;

FIG. 2 is a view of the rotor protection bearing press plate of the present invention;

FIG. 3 is a cross-sectional view of the rotor protection bearing retainer plate of the present invention taken along a radius through the mounting hole;

the device comprises a rotor 1, an impeller 2, a rotor protection bearing pressing plate 3, an axial displacement sensor 4, an axial position detection plate 5, a sealing ring 6, a mounting groove 7, a circuit board 8, a wiring groove 9, a glue blocking wiring block 10 and a wiring hole 11.

Detailed Description

The present invention will be more clearly and completely described below by way of a preferred embodiment in conjunction with the accompanying drawings, without thereby limiting the scope of the utility model to the described embodiment.

Fig. 1 shows an axial displacement detection structure of a magnetic suspension motor rotor provided by the utility model, wherein two ends of the rotor 1 are connected with impellers 2; two ends of the rotor 1 are sleeved with protective bearings 12, and the protective bearings 12 are arranged in the motor through protective bearing seats 13; the rotor protection bearing pressing plate 3 is arranged between the protection bearing seat 13 and the impeller 2, the detection structure comprises an axial displacement sensor 4 arranged on the rotor protection bearing pressing plate 3 and an axial position detection disc 5 sleeved on the rotor 1, and the axial position detection disc 5 is tightly pressed between the impeller 2 and a step surface arranged on the rotor and rotates synchronously with the rotor 1; a seal ring 6 for sealing between the axial position detection disk 5 and the motor case is provided on the outer periphery of the axial position detection disk 5. And the sealing ring 6 and the motor shell, and the rotor protection bearing pressing plate 3 and the rotor protection bearing seat are fixed by screws.

The rotor protection bearing pressure plate 3 is used as the mounting bracket of the axial displacement sensor 4, the structure is compact, the original structure is utilized, the occupied space is reduced, and parts are saved; the axial displacement detection of the rotor with impellers arranged at the two ends can be realized by matching with the axial position detection disc 5 which synchronously rotates with the rotor 1, and the use design requirements are met; the axial position detection disc is used as an axial displacement detection point, the outer circle of the axial position detection disc is used as a sealing surface, the radial sealing of the impeller is realized by matching with a sealing ring, and one part has multiple purposes, so that the parts are saved, and the space is saved.

In order to further simplify the fixation of the sensor and simultaneously avoid the detection part from being influenced by the rotating structure of the motor, as shown in fig. 2-3, a mounting groove 7 for mounting the axial displacement sensor 4 is arranged on one side of the rotor protection bearing pressing plate 3, which is far away from the axial position detection disc 5, a mounting hole penetrating through the rotor protection bearing pressing plate 3 is arranged in the mounting groove 7, the axial displacement sensor 4 is fixed in the mounting hole, a circuit board 8 electrically connected with the axial displacement sensor 4 is also arranged in the mounting groove 7, a circle of wiring groove 9 for wiring is arranged on the rotor protection bearing pressing plate 3, pouring sealant is poured in the mounting groove 7 and the wiring groove 9, and the axial displacement sensor 4 and the electric wire are both fixed by the pouring sealant; the sensor and the circuit are both arranged in the rotor protection bearing pressing plate 3 and cannot be influenced by an external structure, the safety of the detection structure is improved, and the service life is prolonged.

The wiring groove 9 adopts an annular design concentric with the rotor protection bearing, a glue blocking and threading block 10 is arranged on the circumference of the wiring groove 9, the height of the glue blocking and threading block 10 is equal to the height of the wiring groove 9, a threading hole 11 is arranged on the glue blocking and threading block 10, a wiring harness is fixed by pouring glue after passing through the threading hole 11, and the height of the pouring glue is lower than the upper edge of the wiring groove; the arrangement and the fixation of the circuit are convenient.

When the rotor protection bearing pressure plate is used, the axial displacement sensor 4 is fixed on the rotor protection bearing pressure plate 3, the position is unchanged, the axial position detection disc 5 moves in the axial direction synchronously along with the rotor 1, the axial displacement sensor 4 detects the axial position of the axial position detection disc 5, the rotor position is further determined, and the axial displacement of the rotor is judged.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the utility model and these are intended to be within the scope of the utility model.

Claims

1. A magnetic suspension motor rotor axial displacement detection structure is characterized by comprising an axial displacement sensor (4) arranged on a rotor protection bearing pressing plate (3) and an axial position detection disc (5) sleeved on a rotor (1), wherein the axial position detection disc (5) is tightly pressed between the impeller (2) and a step surface arranged on the rotor and synchronously rotates with the rotor (1); and a sealing ring (6) for sealing between the axial position detection disc (5) and the motor shell is arranged on the periphery of the axial position detection disc (5).

2. The magnetic suspension motor rotor axial displacement detection structure of claim 1, characterized in that, the rotor protection bearing pressing plate (3) is provided with a mounting groove (7) for mounting the axial displacement sensor (4) at a side away from the axial position detection disc (5), a mounting hole penetrating through the rotor protection bearing pressing plate (3) is arranged in the mounting groove (7), the axial displacement sensor (4) is fixed in the mounting hole, a circuit board (8) electrically connected with the axial displacement sensor (4) is further arranged in the mounting groove (7), a circle of wiring groove (9) for wiring is arranged on the rotor protection bearing pressing plate (3), potting adhesive is poured in the wiring groove (9), and the electric wire is fixed in the wiring groove (9) through the potting adhesive.

3. The structure for detecting the axial displacement of the rotor of the magnetic suspension motor as claimed in claim 2, wherein the cabling slot (9) is designed in an annular shape concentric with the rotor protection bearing, the glue blocking and threading block (10) is arranged on the circumference of the cabling slot (9), the height of the glue blocking and threading block (10) is equal to the height of the cabling slot (9), and the glue blocking and threading block (10) is provided with a threading hole (11).

4. A magnetic levitation motor rotor axial displacement detection structure as claimed in claim 3, characterized in that the height of the potting adhesive is lower than the upper edge of the cabling channel (9).

5. The structure for detecting the axial displacement of the rotor of the magnetic suspension motor as claimed in claim 1, wherein the sealing ring (6) and the motor housing, and the rotor protection bearing pressure plate (3) and the rotor protection bearing seat are fixed by screws.