CN118868535A - A bearingless motor air gap adjustment method and motor - Google Patents

Abstract

The invention discloses a method for adjusting an air gap of a bearingless motor, which comprises a rotor and a stator, wherein the rotor is arranged on a rotor bracket, the stator is fixedly connected with an end cover of the motor, and the method for adjusting the air gap comprises the following steps: s1, symmetrically arranging a plurality of fixing blocks on the common inner side surfaces of the rotor bracket and the end cover; s2, symmetrically arranging a plurality of stop blocks between the rotor support and the axial gap of the end cover, and adjusting the axial distance between the rotor and the stator; s3, applying torque to the fixed block, so that the fixed block is simultaneously pressed on the inner side surfaces of the end cover and the rotor bracket, and the air gap between the stator and the rotor reaches a required value; s4, applying torque to the end cover and the rotor support in the axial direction so that the stop block generates friction force between the end cover and the rotor support. The invention can maintain the uniformity and the precision of the air gap between the rotor and the stator.

Description

A bearingless motor air gap adjustment method and motor

Technical Field

The present invention relates to the technical field of motors, and more specifically, to an air gap adjustment method for a bearingless motor. The present invention also relates to a bearingless motor.

Background Art

At present, in the process of upgrading and renovating large-scale ship motors, it is necessary to borrow the existing rotating shaft on the original motor, design it into a motor with a shaft, and use the transmission shaft to drive the motor rotor to rotate. However, the rotating shaft cannot be moved at will. To assemble the motor to the transmission shaft, the motor needs to be designed into a multi-petal structure, that is, the whole circular structure such as the rotor, stator, rotor bracket, and end cover is divided into at least two petals, and fixed on the transmission shaft through structures such as flanges and cone sleeves. Since the motor rotor is a permanent magnet rotor, the rotor surface has a strong magnet, and the motor itself has no bearings for support and positioning, this structure needs to ensure that the stator and rotor are assembled at the same time when the transmission shaft is installed. During the manufacturing and shipping process of the motor, it is necessary to ensure that the stator and rotor are assembled together, and the air gap between the stator and rotor is uniform. It is a difficult problem to ensure that there is no eccentricity in the air gap. In the prior art, it is difficult to ensure that the air gap of the bearingless motor is uniform during assembly. Even if the air gap has been adjusted at the factory, the motor is prone to vibration during transportation and installation. It is difficult to ensure that the uniform air gap will not be eccentric or the stator and rotor will rub due to vibration or attraction between the stator and rotor.

The utility model with publication number CN220544845U discloses a split-half permanent magnet shaft-engaging generator, which is a bearingless structure, and both the rotor and the stator are split-half structures. The utility model discloses an L-shaped connecting piece for fixing the rotor to the end plate, but it cannot achieve the purpose of adjusting the air gap and maintaining the air gap uniformity.

Summary of the invention

In view of the problems in the prior art that the air gap between the stator and rotor of a bearingless motor is difficult to maintain uniform and is easily impacted during installation and transportation, causing air gap eccentricity, the present invention provides a bearingless motor air gap adjustment method and a motor to solve the above problems.

A bearingless motor air gap adjustment method and a motor, the motor comprising a rotor and a stator, the rotor being mounted on a rotor support, the stator being fixedly connected to an end cover of the motor, the air gap adjustment method comprising the following steps:

S1. Arrange a plurality of fixing blocks on the common inner side surface of the rotor support and the end cover, and at least one pair of the fixing blocks is symmetrically arranged;

S2, arranging a plurality of stop blocks between the axial gap between the rotor support and the end cover, adjusting the axial distance between the rotor and the stator by the stop blocks, and at least one pair of the stop blocks are symmetrically arranged;

S3, applying torque to the fixing block so that the fixing block is pressed on the inner side surfaces of the end cover and the rotor bracket at the same time, so that the air gap between the stator and the rotor reaches the required value;

S4. Applying torque axially to the end cover and the rotor support so that a stop block generates friction between the end cover and the rotor support.

In the present invention, the fixed blocks and the stop blocks are symmetrically arranged, that is, on the whole circle whose inner side surface of the rotor bracket is the outer ring, a plurality of fixed blocks are provided, and at least two of the fixed blocks are centrally symmetrical with respect to the center of the rotor, or are axially symmetrical with respect to the axis passing through the center of the rotor; a plurality of stop blocks are provided between the rotor bracket and the end cover gap, and at least two of the stop blocks are also centrally symmetrical with respect to the center of the rotor, or are axially symmetrical with respect to the axis passing through the center of the rotor. The symmetrically arranged fixed blocks and stop blocks can make the stator and the rotor accurately positioned and the air gap uniform.

Furthermore, in the step S1, one end of the fixing block is fixed to the inner side of the end cover by bolt 2, and the other end of the fixing block is pressed against the inner side of the rotor bracket.

Furthermore, in the S2 step, screw holes are provided on the sides of the end cover and the rotor bracket facing the stop block installation position, and a through hole is provided on the stop block. Bolt 1 passes through the screw hole on the side of the end cover and the through hole on the stop block, and is connected to the screw hole on the rotor bracket, and the stop block is fixed by the tightening action of bolt 1.

Furthermore, a torque is applied to the second bolt so that the fixing block is closely attached to the inner side of the end cover and the rotor bracket, and the stator and the rotor are symmetrically fastened by the fixing block to maintain an air gap.

Further, in step S4, the end cover and the rotor bracket are tightened by applying torque to the bolt 1, so that the end cover and the rotor bracket generate friction with the stop block.

Furthermore, in the step S2, the stop blocks are evenly arranged between the axial gap between the rotor support and the end cover.

Furthermore, in the step S1, one end of the fixing block is fixed to the inner side of the rotor bracket by bolt 2, and the other end of the fixing block is pressed against the inner side surface of the end cover.

Furthermore, the motor is a multi-petal motor, and the rotor, stator and rotor bracket of the motor are all composed of more than two petals spliced into a whole circle.

Furthermore, the number of lobes of the stator is not equal to the number of lobes of the rotor.

A bearingless motor adopts the above-mentioned air gap adjustment method.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention first sets a fixed block and a stop block on the end cover and the rotor bracket, applies torque to the fixed block successively, adjusts the axial and radial relationship between the end cover and the rotor bracket, and the stator and the end cover are fixedly connected, and the rotor and the rotor bracket are fixedly connected, thereby achieving the purpose of controlling and maintaining the uniformity of the air gap between the rotor and the stator. The radial alignment of the stator and the rotor is maintained by the fixed block, so that the stator and the rotor can produce a uniform gap, and the axial alignment between the stator and the rotor is ensured by the action of the stop block, and a friction force is generated at the same time, which jointly ensures the uniformity of the air gap with the fixed block. Under the joint action of the fixed block and the stop block, the air gap will not be eccentric or even the stator and the rotor will rub against each other due to impact vibration during the transportation of the motor.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the installation of a stop block and a stop block fixed on a motor in the present application;

FIG. 2 is a schematic diagram of the overall structure of the motor of the present invention.

In the schematic diagram: 1. Rotor bracket; 2. End cover; 3. Bolt 2; 4. Positioning stop block; 5. Fixing block; 6. Bolt 1; 7. Rotor; 8. Stator.

DETAILED DESCRIPTION

In order to clearly illustrate the technical features of the application scheme of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" 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 application 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 application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, reference terms; "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like are intended to mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

Example 1

As shown in Figures 1 and 2, a method for adjusting the air gap of a bearingless motor is provided. The motor includes a rotor 7, a stator 8, a motor end cover 2, and a rotor bracket 1 for supporting the rotor 7; the motor is provided with a positioning stop block 4 and a fixing block 5; the stop block 4 is provided between the axial distance between the motor end cover 2 and the rotor bracket 1, and the fixing block 5 is installed on the inner side of the motor end cover 2 and the inner side of the motor rotor bracket 1; the motor end cover 2 is installed on the motor base and forms a whole with the motor stator 8, and the rotor bracket 1 is a part of the motor rotor 7. The method for adjusting the air gap of the motor includes the following steps:

S1. A plurality of fixing blocks 5 are arranged on the common inner side surface of the rotor bracket 1 and the end cover 2. In the present embodiment, four fixing blocks are provided. Based on the working position of the motor, one fixing block is provided in each of the upper, lower, left and right directions. The upper and lower fixing blocks are centrally symmetrical, and the left and right fixing blocks are centrally symmetrical.

In this embodiment, one end of the fixing block 5 is fixed to the inner side of the end cover 2 by means of a bolt 2 3 , and the other end of the fixing block 5 is pressed onto the inner side surface of the rotor bracket 1 .

S2. A plurality of stop blocks 4 are arranged between the axial gap between the rotor bracket 1 and the end cover 2. The stop blocks are used to adjust the axial distance between the rotor 7 and the stator 8. In this embodiment, four stop blocks are provided. Based on the working position of the motor, one stop block is provided in each of the upper, lower, left and right directions. The upper and lower stop blocks are centrally symmetrical, and the left and right stop blocks are centrally symmetrical.

A screw hole is provided on the side of the end cover 2 facing the installation position of the stop block 4, and a bolt 6 passes through the screw hole to be connected to the stop block 4, and the stop block 4 is fixed by the bolt 6.

S3, applying torque to the fixing block 5 so that the fixing block 5 is pressed on the inner side surfaces of the end cover 2 and the rotor bracket 1 at the same time, symmetrically adjusting the fixing block, and controlling the accuracy of the air gap through the machining accuracy of the contact surfaces of the fixing block, the end cover, and the rotor bracket, so that the air gap between the stator 8 and the rotor 7 reaches the required value;

S4, applying torque axially to the end cover 2 and the rotor support 1, so that the stopper 4 generates friction between the end cover 2 and the rotor support 1. In this embodiment, the end cover and the rotor support are tightened by applying torque to bolt 1.

In this embodiment, a plurality of stop blocks 4 are provided on the motor, and the stop blocks 4 are installed between the axial distance between the motor rotor bracket 1 and the motor end cover 2, and the stop blocks 4 are symmetrically distributed, and the stop blocks 4 are firmly fixed by bolts 6. After the stop blocks 4 are fixed and tightened by bolts 6, the stop blocks 4 are positioned by relying on their thickness size, so that the axial size between the stator 8 and the rotor 7 is kept constant, and a friction force is generated at the same time, so as to achieve the effect of axial alignment of the stator 8 and the rotor 7, and at the same time, it can also ensure that the motor rotor 7 will not move in the axial direction, so as to achieve the effect of axial fixing of the rotor 7; one side of the fixing block 5 is installed on the inner side surface of the motor end cover 2, and the fixing blocks 5 are symmetrically distributed and installed on the inner side surface of the motor end cover 2 by bolts 2 3, so that the other side of the fixing block 5 is pressed on the motor rotor bracket 1, and after the fixing blocks 5 are symmetrically fixed and tightened by bolts 2 3, a certain air gap is maintained radially between the rotor 7 and the stator 8, and the accuracy of the air gap between the stator 8 and the rotor 7 is maintained by the flatness of the fixing block 5 itself.

With the joint action of the fixing block 5 and the stop block 4, the motor can be prevented from having air gap eccentricity or even stator-rotor friction due to impact vibration during transportation, thereby ensuring better protection of the motor during storage, shipment and installation after manufacturing, and making the shipment and installation of the bearingless motor more convenient and quicker.

This embodiment also discloses a motor using the above-mentioned air gap adjustment method, wherein the motor is a multi-petal motor, that is, the rotor 7, the stator 8, the rotor bracket 1, and the end cover 2 are all multi-petal structures assembled into a full circular structure, wherein the number of petals of the rotor 7 and the stator 8 are not equal.

Example 2

As shown in Figures 1 and 2, a method for adjusting the air gap of a bearingless motor is provided. The motor includes a rotor 7, a stator 8, a motor end cover 2, and a rotor bracket 1 for supporting the rotor 7; the motor is provided with a positioning stop block 4 and a fixing block 5; the stop block 4 is provided between the axial distance between the motor end cover 2 and the rotor bracket 1, and the fixing block 5 is installed on the inner side of the motor end cover 2 and the inner side of the motor rotor bracket 1; the motor end cover 2 is installed on the motor base and forms a whole with the motor stator 8, and the rotor bracket 1 is a part of the motor rotor 7. The method for adjusting the air gap of the motor includes the following steps:

S1. Arrange a plurality of fixing blocks 5 on the common inner side surface of the rotor support 1 and the end cover 2, wherein at least one pair of fixing blocks 5 is in a symmetrical relationship;

S2. A plurality of stop blocks 4 are arranged between the axial gap between the rotor support 1 and the end cover 2 to adjust the axial distance between the rotor 7 and the stator 8, and at least one pair of the stop blocks 4 is in a symmetrical relationship;

S3, applying torque to the fixing block 5, so that the fixing block 5 is pressed on the inner side surfaces of the end cover 2 and the rotor bracket 1 at the same time, so that the air gap between the stator 8 and the rotor 7 reaches the required value;

S4, applying torque axially to the end cover 2 and the rotor support 1, so that the stop block 4 generates friction force between the end cover 2 and the rotor support 1.

In this embodiment, six fixing blocks 5 are provided. Based on the working position of the motor, one is provided in each of the left and right directions, and they are symmetrical with the center of the rotor 7 as the center point. Three are provided on the top and one is provided on the bottom. The fixing block 5 in the middle position on the top is symmetrical with the fixing block 5 on the bottom with the center of the rotor as the center point. Among the three fixing blocks 5 on the top, the two on the sides are in an axially symmetrical relationship.

In this embodiment, six stop blocks 4 are provided, with one each in the left and right directions based on the position of the motor when it is working, and they are symmetrical with the center of the rotor 7 as the center point, three are provided on the top and one is provided on the bottom, wherein the stop block 4 at the middle position on the top and the stop block 4 on the bottom are symmetrical with the center of the rotor 7 as the center point. Among the three stop blocks 4 on the top, the two on both sides are in an axisymmetric relationship.

In other embodiments, four stop blocks 4 and four fixing blocks 5 are provided, and two of them are in an axisymmetric relationship with each other.

The symmetry axis referred to in this embodiment is an axis passing through the center of the rotor 7 .

Example 3

The difference between this embodiment and embodiment 2 is that three fixing blocks 5 and stop blocks 4 are provided, evenly arranged on the inner side surfaces of the end cover 2 and the rotor bracket 1, and three stop blocks 4 are provided, evenly arranged in the gap between the end cover 2 and the rotor bracket 1.

Example 4

As shown in FIG. 2 , a method for adjusting the air gap of a bearingless motor is provided. The motor comprises a rotor 7 and a stator 8 . The rotor 7 is mounted on a rotor bracket 1 , and the stator 8 is fixedly connected to an end cover 2 of the motor.

The difference from Example 1 is that the fixing screw hole of the stop block 4 is set on the rotor bracket 1, one end of the fixing block 5 is fixed on the inner side of the rotor bracket 1, and the other end is pressed on the inner side of the end cover 2. The side of the rotor bracket 1 is provided with a screw hole opposite to the installation position of the stop block 4, and the bolt 1 6 passes through the screw hole on the side of the rotor bracket 1 to connect with the stop block 4. One end of the fixing block 5 is fixed to the inner side of the rotor bracket 1 by the bolt 2 3, and the other end of the fixing block 5 is pressed on the inner side of the end cover 2.

In other embodiments, the fixing screw hole of the stopper block 4 is provided on the end cover 2, and the fastening bolt of the fixing block 5 is provided on the rotor bracket 1. Alternatively, the fixing screw hole of the stopper block 4 is provided on the rotor bracket 1, and the fastening bolt of the fixing block 5 is provided on the inner side of the end cover 2. The above embodiments can achieve the effect of adjusting the air gap and maintaining the air gap uniform.

Specifically, in order to connect the upper and lower halves or more petal structures into one and ensure the same assembly tolerance as the overall machine base, the motor end cover 2 can also be connected by using a flange plate, and the end cover 2 can use high-strength bolts and specific anti-loosening washers to fasten the upper and lower petal structures.

Obviously, the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. 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 claims of the present invention.

Claims (10)

1. The method for adjusting the air gap of the bearingless motor is characterized by comprising a rotor and a stator, wherein the rotor is arranged on a rotor bracket, the stator is fixedly connected with an end cover of the motor, and the method for adjusting the air gap comprises the following steps of:

s1, arranging a plurality of fixing blocks on the common inner side surfaces of the rotor bracket and the end cover, wherein at least one pair of fixing blocks are symmetrically arranged;

s2, arranging a plurality of stop blocks between the rotor support and the axial gap of the end cover, and adjusting the axial distance between the rotor and the stator, wherein at least one pair of stop blocks are symmetrically arranged;

S3, applying torque to the fixed block, so that the fixed block is simultaneously pressed on the inner side surfaces of the end cover and the rotor bracket, and the air gap between the stator and the rotor reaches a required value;

S4, applying torque to the end cover and the rotor support in the axial direction so that the stop block generates friction force between the end cover and the rotor support.

2. The method for adjusting the air gap of the bearingless motor according to claim 1, wherein in the step S2, screw holes are formed in the side surfaces of the end cover and the rotor bracket, which are opposite to the mounting position of the stop block, through holes are formed in the stop block, and a first bolt penetrates through the screw holes in the side surface of the stop block and the through holes in the stop block and is connected with the screw holes in the rotor bracket, and the stop block is fixed through the first bolt.

3. The method for adjusting an air gap of a bearingless motor according to claim 1, wherein in the step S1, one end of the fixing block is fixed on the inner side of the end cover through a second bolt, and the other end of the fixing block is pressed on the inner side surface of the rotor bracket.

4. A method of adjusting an air gap of a bearingless motor according to claim 3, wherein a torque is applied to the second bolt to make a fixing block closely contact with the end cover and the inner side of the rotor support, and the fixing block is symmetrically fastened to make the stator and the rotor maintain the air gap.

5. The bearingless motor air gap adjustment method of claim 2, wherein in step S4, the end cap and the rotor support are tensioned by applying a torque to the first bolt, such that both the end cap and the rotor support generate friction with the stop block.

6. The bearingless motor air gap adjustment method of claim 1, wherein a plurality of the fixed blocks are uniformly arranged on the rotor support and the inner side of the end cover.

7. The bearingless motor air gap adjustment method of claim 1, wherein in step S2, the stop blocks are uniformly disposed between the rotor support and the end cap axial void.

8. The method for adjusting an air gap of a bearingless motor according to claim 1, wherein in the step S1, one end of the fixing block is fixed on the inner side of the rotor bracket by a second bolt, and the other end of the fixing block is pressed on the inner side surface of the end cover.

9. The bearingless motor air gap adjusting method of claim 1, wherein the motor is a multi-petal motor, and a rotor, a stator and a rotor bracket of the motor are spliced into a whole circle by more than two petals.

10. A bearingless motor characterized by employing the air gap adjustment method of any one of claims 1-9.