Motor air gap eccentricity simulation device

Abstract

The utility model discloses a motor air gap eccentricity simulation device which comprises a machine shell, a stator, a rotor, a first end cover, a second end cover, a first jacking assembly and a second jacking assembly. The first end cover and the second end cover are connected to the two axial ends of the machine shell respectively, the machine shell can move relative to the first end cover in the radial direction of the machine shell and is locked to the first end cover, and the second end cover can move relative to the machine shell in the radial direction of the machine shell and is locked to the machine shell; the first jacking assembly comprises a plurality of first jacking elements distributed in the circumferential direction of the machine shell, and the first jacking elements are connected to the first end cover. The second jacking assembly comprises a plurality of second jacking elements distributed in the circumferential direction of the machine shell, and the second jacking elements are connected to the second end cover. According to the scheme, the first jacking assembly and the second jacking assembly are arranged, so that the risk that the stator and the rotor are easy to attract each other due to magnetic attraction force can be reduced in the process of adjusting different eccentric sizes of the stator and the rotor of the motor.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of motor eccentricity simulation, in particular to a motor air gap eccentricity simulation device. BACKGROUND

[0002] In the manufacturing and assembling process of the electric drive of a new energy automobile, the theoretical concentricity of the motor stator and rotor cannot be guaranteed, and the eccentricity fault of the motor stator and rotor will affect the NVH performance (Noise, Vibration Harshness, noise, vibration and harshness) of the motor.

[0003] In terms of eccentricity fault simulation, the eccentricity fault simulation device can adjust the different eccentricity sizes between the stator and the rotor, so as to simulate different eccentricity degrees of the motor stator and rotor.

[0004] However, due to the magnetic attraction between the stator and the rotor of the motor, during the adjustment of the different eccentricity sizes of the motor stator and rotor, the stator and the rotor are in a relative active state, which causes the stator and the rotor to be easily attracted to each other due to the magnetic attraction, thereby causing the problem that the stator or the rotor is difficult to move. CONTENT OF THE INVENTION

[0005] The application provides to reduce the risk that the stator and the rotor are easily attracted to each other due to the magnetic attraction during the adjustment of the different eccentricity sizes of the motor stator and rotor.

[0006] To solve the above technical problems, the technical scheme provided by the application is:

[0007] A motor air gap eccentricity simulation device, comprising a housing, a stator, a rotor, a first end cover, a second end cover, a first top driving assembly and a second top driving assembly;

[0008] The first end cover and the second end cover are respectively connected to the axial two ends of the housing, the housing can move relative to the first end cover along the radial direction of the housing and be locked to the first end cover, and the second end cover can move relative to the housing along the radial direction of the housing and be locked to the housing;

[0009] The stator and the rotor are located in the housing, the stator is sleeved outside the rotor and fixed to the housing, and one end of the rotor in the axial direction is rotationally connected to the first end cover and the other end is rotationally connected to the second end cover;

[0010] The first end cap is fixedly connected with a first top driving assembly, the first top driving assembly comprises a plurality of first top driving elements which are distributed circumferentially along the shell, the first top driving elements are connected to the first end cap, and the first top driving elements are configured to be movable relative to the first end cap along the radial direction of the shell to top drive the shell, so that the first end cap is moved relative to the shell along the radial direction of the shell.

[0011] The second end cap is fixedly connected with a second top driving assembly, the second top driving assembly comprises a plurality of second top driving elements which are distributed circumferentially along the shell, the second top driving elements are connected to the second end cap, and the second top driving elements are configured to be movable relative to the second end cap along the radial direction of the shell to top drive the shell, so that the second end cap is moved relative to the shell along the radial direction of the shell.

[0012] Based on the above scheme, the following improvements can be made.

[0013] In some embodiments, the first top driving assembly further comprises a plurality of first connecting seats, the first connecting seats are fixed to one side of the first end cap which faces the shell in the axial direction of the shell, and the first top driving elements are connected to the first end cap through the first connecting seats.

[0014] In some embodiments, the shell is fixedly connected with an annular boss, the annular boss is located at one end of the shell which faces the first end cap;

[0015] The first connecting seats are located outside the annular boss in the radial direction of the shell, and the first top driving elements are configured to be movable relative to the first end cap along the radial direction of the shell to top drive the outer circumferential surface of the annular boss.

[0016] In some embodiments, the first top driving elements comprise first top driving bolts, the first connecting seats are provided with internal threads, and the cooperation between the first top driving bolts and the internal threads realizes the movement of the first top driving bolts relative to the first end cap.

[0017] In some embodiments, the second top driving assembly further comprises a plurality of second connecting seats, the second connecting seats are fixed to one side of the second end cap which is away from the shell in the axial direction of the shell, and the second top driving elements are connected to the second end cap through the second connecting seats.

[0018] In some embodiments, the second connecting seats comprise first connecting parts and second connecting parts which are perpendicular to each other, the first connecting parts are fixed to one side of the second end cap which is away from the shell in the axial direction of the shell, and the second connecting parts are located outside the shell in the radial direction and are arranged in a spaced manner with the outer circumferential surface of the shell.

[0019] The second top driving element is connected to the second connecting portion, and is configured to be movable relative to the second connecting portion along the radial direction of the casing to drive the outer circumferential surface of the casing.

[0020] In some embodiments, the second top driving element comprises a second top driving bolt, the second connecting seat is provided with an internal thread, and cooperation of the second top driving bolt and the internal thread enables movement of the second top driving bolt relative to the second end cover.

[0021] In some embodiments, the first end cover is provided with a first scale line on the surface thereof in the axial direction of the casing, and the first scale line is used to read the distance of movement of the casing relative to the first end cover along the radial direction of the casing.

[0022] In some embodiments, the second end cover is provided with a second scale line on the surface thereof in the axial direction of the casing, and the second scale line is used to read the distance of movement of the second end cover relative to the casing along the radial direction of the casing.

[0023] In some embodiments, the casing is fixedly connected with a ring-shaped boss, and the ring-shaped boss is located at the end of the casing facing the first end cover.

[0024] The ring-shaped boss is provided with a first fixing hole, the first end cover is provided with a first locking hole capable of being axially aligned with the first fixing hole, and the diameter of the first fixing hole is greater than the diameter of the first locking hole.

[0025] The motor air gap eccentric simulation device further comprises a first locking bolt, the casing can pass through the first fixing hole and be fastened to the first locking hole through the screw rod of the first locking bolt, and the head of the first locking bolt is pressed against the surface of the ring-shaped boss facing away from the first end cover, so as to fasten the casing to the first end cover.

[0026] In some embodiments, the end surface of the casing facing the second end cover is provided with a second locking hole, the second end cover is provided with a second fixing hole capable of being axially aligned with the second locking hole, and the diameter of the second fixing hole is greater than the diameter of the second locking hole.

[0027] The motor air gap eccentric simulation device further comprises a second locking bolt, the second end cover can pass through the second fixing hole and be fastened to the second locking hole through the screw rod of the second locking bolt, and the head of the second locking bolt is pressed against the surface of the second end cover facing away from the casing, so as to fasten the second end cover to the casing.

[0028] The beneficial effects of the present application are as follows:

[0029] The motor air gap eccentric fault simulation tool of the application comprises a shell, a stator, a rotor, a first end cover, a second end cover, a first jacking assembly and a second jacking assembly. The first end cover is used to be connected to a dynamometer, thereby providing a load for the simulation tool. One end of the rotor is rotatably connected to the first end cover, and the other end is rotatably connected to the second end cover. The first end cover is fixed and does not move. When the shell moves, the stator fixedly connected to the shell moves with it. Moving the shell also moves the second end cover connected to the shell, thereby moving the end of the rotor opposite to the first end cover. Since the second end cover can move relative to the shell, the radial position of the end of the rotor connected to the second end cover can be changed by moving the second end cover relative to the shell, thereby achieving the adjustment of different eccentric degrees of the stator and the rotor.

[0030] In addition, during the eccentricity adjustment process, the shell and the first end cover, and the shell and the second end cover are in a relative active state. The magnetic attraction force between the stator and the rotor can cause the stator and the rotor to be attracted to each other. The first jacking assembly and the second jacking assembly are provided. Therefore, when the shell needs to move relative to the first end cover, each first jacking element in the first jacking assembly can move radially along the shell to jack the shell, thereby moving the shell relative to the first end cover. Since each first jacking element radially supports the shell, the stator and the rotor in the shell can be prevented from being attracted to each other. When the second end cover needs to move relative to the shell, each second jacking element in the second jacking assembly can move radially along the shell to jack the shell, thereby moving the second end cover relative to the shell. Since each second jacking element radially supports the second end cover, the stator and the rotor in the shell can be prevented from being attracted to each other. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor based on these drawings.

[0032] Figure 1 is a perspective structural schematic view of the motor air gap eccentric simulation device provided by the application;

[0033] Figure 2 is Figure 1 a front view of the motor air gap eccentric simulation device of

[0034] Figure 3 is Figure 1 and Figure 2 axial sectional views of the motor air gap eccentric simulation device of

[0035] Figure 4is a structural diagram of two eccentric types of the motor air gap eccentric simulation device provided by the application;

[0036] Figure 5 is an assembly structure perspective view of the motor air gap eccentric simulation device provided by the application and a dynamometer;

[0037] Figure 6 is Figure 3 a partial enlarged view of the motor air gap eccentric simulation device at the first top driving element;

[0038] Figure 7 is Figure 1 and Figure 3 a top view of the first end cover in the motor air gap eccentric simulation device;

[0039] Figure 8 is Figure 1 and Figure 3 a three-dimensional structural schematic view of the motor air gap eccentric simulation device;

[0040] Figure 9 is Figure 3 a partial enlarged view of the motor air gap eccentric simulation device at the second top driving element;

[0041] Figure 10 is Figure 1 and Figure 3 a top view of the second end cover in the motor air gap eccentric simulation device;

[0042] Figure 11 is Figure 7 a partial enlarged view of the first end cover at the first scale line.

[0043] Explanation of reference signs:

[0044] motor air gap eccentric simulation device 100; motor shell 110; mounting cavity 1100; annular boss 111; first locking bolt 1110; first fixed hole 1111; second locking hole 112; first end cover 120; first bearing seat 121; first bearing 122; first locking hole 123; first scale line 124; sunken area 125; second end cover 130; second locking bolt 1300; rotary transformer 131; measurement hole 132; second bearing seat 133; second bearing 134; second fixed hole 135; stator 140; rotor 150; first top driving assembly 160; first top driving element 161; first connecting seat 162; first fixing member 163; second top driving assembly 170; second top driving element 171; second connecting seat 172; first connecting part 1721; second connecting part 1722; second fixing member 173; output shaft 180; dynamometer 200. DETAILED DESCRIPTION

[0045] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0046] Reference herein to“an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the embodiments described herein are combinable with each other.

[0047] The eccentric fault of the motor is a common fault type of the motor, and the eccentric fault of the stator and the rotor of the motor affects the NVH (Noise, Vibration Harshness) of the motor in operation. In order to analyze the influence of the eccentric fault of the motor on the NVH of the motor in operation, in the related art, a motor air gap eccentric simulation device is used to simulate the eccentric fault of the motor, and the motor air gap eccentric simulation device can adjust different eccentric sizes of the stator and the rotor of the motor, and is used to analyze the influence of different eccentric degrees on the motor NVH. However, in the process of adjusting the different eccentric sizes of the stator and the rotor of the motor, since the stator and the rotor are in a relative active state, and there is a magnetic attraction force between the stator and the rotor, the stator and the rotor are easily attracted to each other due to the magnetic attraction force, resulting in difficulty in adjusting the eccentric size of the stator and the rotor of the motor.

[0048] In view of this, in the process of adjusting the different eccentric sizes of the stator and the rotor of the motor, in order to reduce the risk that the stator and the rotor are easily attracted to each other due to the magnetic attraction force, the present application provides a motor air gap eccentric simulation device, which can overcome the influence of the magnetic attraction force between the stator and the rotor in the adjusting process, thereby reducing the risk that the stator and the rotor are attracted to each other. The specific structure, principle and function of the motor air gap eccentric simulation device of the present application will be described in detail below in combination with the drawings.

[0049] The present application provides a motor air gap eccentric simulation device for simulating the eccentric fault of the stator and the rotor of the motor, and can adjust different eccentric degrees of the stator and the rotor. In one embodiment, referring to Figures 1 to 3 , Figure 1 is a perspective structural schematic diagram of an embodiment of the motor air gap eccentric simulation device provided by the present application, Figure 2 is a front view of the motor air gap eccentric simulation device of Figure 1 , Figure 3 is a side view of the motor air gap eccentric simulation device of Figure 1 , and Figure 2An axial sectional view of the motor air gap eccentric simulation device.

[0050] The motor air gap eccentric simulation device 100 comprises a casing 110, a first end cover 120, a second end cover 130, a stator 140, a rotor 150, a first top driving assembly 160 and a second top driving assembly 170.

[0051] The first end cover 120 and the second end cover 130 are respectively connected to the axial two ends of the casing 110, and the casing 110, the first end cover 120 and the second end cover 130 jointly enclose to form a mounting cavity 1100, and the stator 140 and the rotor 150 are located in the mounting cavity 1100.

[0052] One end of the rotor 150 is rotationally connected to the first end cover 120, and the other end is rotationally connected to the second end cover 130, the stator 140 is sleeved outside the rotor 150 and fixed to the casing 110, and the stator 140 cooperates with the rotor 150 to generate electromagnetic force to provide the rotor 150 with rotational speed and torque.

[0053] The stator 140 and the casing 110 can be quickly fixed and installed by shrink fitting process, and the basic principle of the shrink fitting process is to use the property of thermal expansion and cold contraction to enable the casing 110 to be assembled to the outside of the stator 140. Specifically, the casing 110 can be heated to a high temperature so that the casing 110 obtains a larger volume, and then the casing 110 is quickly assembled to the outside of the stator 140. As the casing 110 cools down, its volume will decrease, generating friction with the stator 140, thereby achieving stable assembly.

[0054] The casing 110 can move along its radial direction relative to the first end cover 120 and be locked to the first end cover 120, and the second end cover 130 can move along the radial direction of the casing 110 relative to the casing 110 and be locked to the casing 110.

[0055] When adjusting the eccentric size, the first end cover 120 is fixed, and when moving the casing 110 radially, the stator 140 fixedly connected with the casing 110 moves with it, and moving the casing 110 also drives the second end cover 130 connected with the casing 110 to move, thus driving the end of the rotor 150 connected with the second end cover 130 to move. Since the second end cover 130 can move relative to the casing 110, the radial position of the end of the rotor 150 connected with the second end cover 130 can be changed by moving the second end cover 130 relative to the casing 110, so as to measure the required stator-rotor gap. In this way, the adjustment of different eccentric degrees of the stator 140 and the rotor 150 can be realized.

[0056] Since the radial position of the casing 110 relative to the first end cover 120 is adjusted, the casing 110 and the first end cover 120 are in a relative active state, and the radial position of the second end cover 130 relative to the casing 110 is adjusted, the second end cover 130 and the casing 110 are also in a relative active state. During the adjustment process, the magnetic attraction force between the stator 140 and the rotor 150 causes the stator 140 and the rotor 150 to be attracted to each other. The first and second top driving assemblies 160 and 170 can overcome the influence of the magnetic attraction force and reduce the risk of the stator 140 and the rotor 150 being attracted to each other.

[0057] The first top driving assembly 160 includes a plurality of first top driving elements 161 distributed circumferentially along the casing 110. The first top driving elements 161 are connected to the first end cover 120 and are configured to move radially along the casing 110 relative to the first end cover 120 to drive the casing 110, thereby forcing the casing 110 to move radially along the casing 110 relative to the first end cover 120. The plurality of first top driving elements 161 of the first top driving assembly 160 can move relative to the first end cover 120 to drive the casing 110 and move the casing 110 radially. Therefore, when the casing 110 moves radially relative to the first end cover 120, the plurality of first top driving elements 161 of the first top driving assembly 160 can provide radial support to the casing 110 at multiple locations. The support force can overcome the magnetic attraction force between the stator 140 and the rotor 150 and reduce the risk of the stator 140 and the rotor 150 being attracted to each other due to the magnetic attraction force.

[0058] The second top driving assembly 170 includes a plurality of second top driving elements 171 distributed circumferentially along the casing 110. The second top driving elements 171 are connected to the second end cover 130 and are configured to move radially along the casing 110 relative to the second end cover 130 to drive the casing 110, thereby forcing the second end cover 130 to move radially along the casing 110 relative to the casing 110. Therefore, when the second end cover 130 moves radially relative to the casing 110, the plurality of second top driving elements 171 of the second top driving assembly 170 can provide radial support to the second end cover 130 at multiple locations. The support force can overcome the magnetic attraction force between the stator 140 and the rotor 150 and reduce the risk of the stator 140 and the rotor 150 being attracted to each other due to the magnetic attraction force.

[0059] In the present application, by moving the casing 110 radially along the casing 110 relative to the first end cover 120 and locking the casing 110 to the first end cover 120, and moving the second end cover 130 radially along the casing 110 relative to the casing 110 and locking the second end cover 130 to the casing 110, the adjustment of different eccentricity can be quickly achieved, and the adjustment process is simple and efficient.

[0060] And, in the motor air gap eccentricity simulation device 100 of the present application, after adjusting the eccentricity degree of the stator and the rotor, when the central axis of the rotor 150 is parallel to the central axis of the stator 140 with a certain interval, the parallel eccentricity (also called static eccentricity) type of motor air gap can be simulated (as shown in (a) of Figure 4 when the central axis of the rotor 150 is inclined to cross the central axis of the stator 140, the inclined eccentricity type of motor air gap can be simulated (as shown in (b) of Figure 4 Therefore, the motor air gap eccentricity simulation device 100 of the present application can be used to simulate two different eccentricity types of motors.

[0061] For example, the housing 110 first moves 0.5mm radially relative to the first end cover 120, driving the second end cover 130 to move 0.5mm synchronously, at this time, if the second end cover 130 is moved back 0.5mm, the motor air gap eccentricity simulation device 100 of the present application can be used to simulate the fault condition of parallel eccentricity, if the second end cover 130 is moved back 0.2mm, the motor air gap eccentricity simulation device 100 of the present application can be used to simulate the fault condition of inclined eccentricity.

[0062] In one embodiment, the first end cover 120 of the present application can be used to be mounted to a dynamometer, and the dynamometer is used to provide a load to the motor air gap eccentricity simulation device 100, please refer to Figure 5 , Figure 5 is a three-dimensional schematic view of the assembly structure of the motor air gap eccentricity simulation device 100 of the present application and the dynamometer, specifically, the dynamometer 200 and the first end cover 120 in the motor air gap eccentricity simulation device 100 are fastened and connected through bolts and other fasteners, the dynamometer 200 is connected to the output end of the motor air gap eccentricity simulation device 100, as an example, combined with Figure 3 and Figure 5 The motor air gap eccentricity simulation device 100 further comprises an output shaft 180, the output shaft 180 is provided through the first end cover 120 and is connected to one end of the rotor 150 through spline connection, and the dynamometer 200 is connected to the output shaft 180 to provide a load. Figure 5 The scheme of simulating a horizontal motor by the motor air gap eccentricity simulation device 100 is shown.

[0063] The following describes how the housing 110 is locked to the first end cover 120, and how the second end cover 130 is locked to the housing 110.

[0064] According to the foregoing, since the first end cover 120 needs to be mounted to the dynamometer 200, the side of the casing 110 axially away from the first end cover 120 is blocked by the dynamometer 200, in order to facilitate locking of the casing 110 to the first end cover 120, in an embodiment, the annular boss 111 is fixedly connected to the casing 110, and the annular boss 111 is located at the end of the casing 110 axially towards the first end cover 120, so that the operation of locking the casing 110 to the first end cover 120 can be realized at the annular boss 111.

[0065] Specifically, please refer to Figure 6 , Figure 6 is Figure 3 The local enlarged view of the motor air gap eccentric simulation device 100 at the first top driving element 161, in an embodiment, the annular boss 111 is provided with a first fixing hole 1111, and the first end cover 120 is provided with a first locking hole 123 capable of being axially aligned with the first fixing hole 1111, and the diameter of the first fixing hole 1111 is greater than the diameter of the first locking hole 123.

[0066] The motor air gap eccentric simulation device 100 further comprises a first locking bolt 1110, the casing 110 can pass through the first fixing hole 1111 by the screw rod of the first locking bolt 1110 and be fastened to the first locking hole 123, and the head of the first locking bolt 1110 is pressed against the side of the annular boss 111 axially away from the first end cover 120, so as to fasten the casing 110 to the first end cover 120.

[0067] Since the screw rod of the first locking bolt 1110 needs to pass through the first fixing hole 1111 and be fastened to the first locking hole 123, the first locking hole 123 is a threaded hole to be able to threadedly cooperate with the screw rod of the first locking bolt 1110 to realize locking, the diameter of the first fixing hole 1111 needs to be greater than the rod diameter of the screw rod of the first locking bolt 1110, so as to facilitate adjustment of the position of the casing 110 relative to the first end cover 120 in the radial direction of the casing 110, the diameter of the first fixing hole 1111 depends on the limit distance of the radial movement of the casing 110, that is, the adjustable range of the radial position of the casing 110, and the first fixing hole 1111 can be a circular hole, of course, other shape holes such as square holes are not excluded.

[0068] In this embodiment, when adjusting the movement distance of the casing 110 relative to the first end cover 120 in the radial direction of the casing 110, the first locking bolt 1110 can be loosened first, the casing 110 is forced to move relative to the first end cover 120 in the radial direction of the casing 110 by the movement of each first top driving element 161 relative to the first end cover 120 in the radial direction of the casing 110, and then the first locking bolt 1110 is locked after the casing 110 is moved to the required distance in the radial direction.

[0069] Further, please refer toFigure 1 and Figure 6 , together with Figure 7 and Figure 8 , Figure 7 is Figure 1 and Figure 3 a top view of the first end cover 120 in the motor air gap eccentric simulation device 100 of Figure 8 is Figure 1 and Figure 3 a perspective structural schematic view of the shell 110 in the motor air gap eccentric simulation device 100, the number of the first locking holes 123 on the first end cover 120 and the number of the first fixing holes 1111 on the annular boss 111 are both multiple, the multiple first locking holes 123 are distributed along the circumference of the first end cover 120, and the multiple first fixing holes 1111 are distributed along the circumference of the annular boss 111. In the embodiment, the multiple first locking bolts 1110 are adopted to realize the locking between the annular boss 111 of the shell 110 and the first end cover 120, and the locking effect is better. Figure 1 and Figure 7 and Figure 8 It is shown that the number of the first locking bolts 1110, the first locking holes 123 on the first end cover 120 and the first fixing holes 1111 on the annular boss 111 are all twelve, and it can be understood that in other embodiments, the number of the first locking bolts 1110, the first locking holes 123 on the first end cover 120 and the first fixing holes 1111 on the annular boss 111 can also be other values.

[0070] Please refer to Figure 9 , Figure 9 is Figure 3 a partial enlarged view of the second top moving element 171 in the motor air gap eccentric simulation device 100, together with Figure 8 In an embodiment, the end face of the shell 110 facing the second end cover 130 is provided with the second locking hole 112, and the second end cover 130 is provided with the second fixing hole 135 which can be axially aligned with the second locking hole 112, and the hole diameter of the second fixing hole 135 is greater than the hole diameter of the second locking hole 112.

[0071] The motor air gap eccentric simulation device 100 further comprises the second locking bolt 1300, the second end cover 130 can pass through the second fixing hole 135 and be fastened to the second locking hole 112 through the shank of the second locking bolt 1300, and the head of the second locking bolt 1300 is pressed against the side of the second end cover 130 away from the shell 110, so as to fasten the second end cover 130 to the shell 110.

[0072] Since the screw rod of the second locking bolt 1300 needs to pass through the second fixing hole 135 and be fastened to the second locking hole 112, the second locking hole 112 is a threaded hole to be able to threadedly cooperate with the screw rod of the second locking bolt 1300 to achieve locking, and the hole diameter of the second fixing hole 135 needs to be greater than the rod diameter of the screw rod of the second locking bolt 1300, so that the second end cover 130 can move along the radial direction of the shell 110 relative to the shell 110, and the hole diameter of the second fixing hole 135 depends on the limit distance of the radial movement of the second end cover 130 relative to the shell 110, that is, the adjustable range of the radial position of the second end cover 130, and the second fixing hole 135 can be a circular hole, and of course, other shaped holes such as square holes are not excluded.

[0073] In this embodiment, when adjusting the movement distance of the second end cover 130 relative to the shell 110 in the radial direction of the shell 110, the second locking bolt 1300 is first loosened, the second end cover 130 is forced to move relative to the shell 110 in the radial direction of the shell 110 through the movement of each second top driving element 171 relative to the second end cover 130 in the radial direction of the shell 110, and the second end cover 130 moves to the required distance, and then the second locking bolt 1300 is locked.

[0074] Further, referring to Figure 1 , Figure 8 and Figure 9 , in combination with Figure 10 , Figure 10 is Figure 1 and Figure 3 the top view of the second end cover 130 in the motor air gap eccentric simulation device 100, the number of the second locking bolt 1300, the second fixing hole 135 on the second end cover 130 and the second locking hole 112 on the end face of the shell 110 is the same and is multiple, multiple second fixing holes 135 are distributed along the circumferential direction of the second end cover 130, and multiple second locking holes 112 are distributed along the circumferential direction of the shell 110. In this embodiment, multiple second locking bolts 1300 are used to achieve locking between the shell 110 and the second end cover 130, and the locking effect is better. Figure 1 , Figure 8 and Figure 10 show that the number of the second locking bolt 1300, the second fixing hole 135 on the second end cover 130 and the second locking hole 112 on the end face of the shell 110 is eight, and it can be understood that in other embodiments, the number of the second locking bolt 1300, the second fixing hole 135 on the second end cover 130 and the second locking hole 112 on the end face of the shell 110 can also be other values.

[0075] The structure of the first and second top driving assemblies 160 and 170 and the principle of how the first top driving assembly 160 drives the movement of the casing 110 and how the second top driving assembly 170 drives the movement of the second end cover 130 are described in detail below.

[0076] Referring again to Figure 1 and Figure 6 In one embodiment, the first top driving assembly 160 further comprises a plurality of first connecting seats 162 fixed to the side of the first end cover 120 facing the casing 110 in the axial direction of the casing 110, and the first top driving element 161 is connected to the first end cover 120 through the first connecting seats 162.

[0077] In this embodiment, the first connecting seats 162 fixed to the first end cover 120 serve as the mounting support structure of the first top driving element 161, and the radial movement of the first top driving element 161 relative to the first connecting seats 162 along the casing 110 realizes the radial movement of the first top driving element 161 relative to the first end cover 120 along the casing 110, so that the first top driving element 161 can drive the casing 110.

[0078] The first connecting seats 162 can be fixed to the first end cover 120 through first fixing members 163, which can be bolts, screws, or other fixing members. In other embodiments, the first connecting seats 162 can also be fixed to the first end cover 120 by welding or other methods, or the first connecting seats 162 can be part of the first end cover 120 itself.

[0079] When the casing 110 is fixedly connected with the annular boss 111 described above, the first connecting seats 162 are located on the outside of the annular boss 111 in the radial direction of the casing 110, and the first top driving element 161 is configured to move relative to the first connecting seats 162 in the radial direction of the casing 110 to drive the outer circumferential surface of the annular boss 111. It can be understood that in other embodiments, the casing 110 can also not be connected with the annular boss 111, and the first top driving element 161 can directly drive the outer circumferential surface of the casing 110 to achieve the driving of the casing 110 by the first top driving element 161.

[0080] In one embodiment, the first top driving element 161 comprises a first top driving bolt, and the first connecting seat 162 is provided with an internal thread, and the cooperation of the first top driving bolt and the internal thread of the first connecting seat 162 realizes the movement of the first top driving bolt relative to the first end cover 120.

[0081] In the embodiment, the first top driving element 161 is threadedly connected with the first connecting seat 162, so that the movement of the first top driving element 161 relative to the first connecting seat 162 can be achieved by screwing the first top driving element 161, and after the first top driving element 161 is loosened, the first top driving element 161 can still keep the locked state with the first connecting seat 162, that is, the first top driving element 161 can still keep the support effect on the shell 110 in the radial direction.

[0082] In one embodiment, the second top driving assembly 170 further comprises a plurality of second connecting seats 172, the second connecting seats 172 are fixed to the second end cover 130 on the side of the shell 110 axially away from the shell 110, and the second top driving element 171 is connected to the second end cover 130 through the second connecting seats 172.

[0083] In the embodiment, the second connecting seats 172 fixed to the second end cover 130 serve as the mounting support structure of the second top driving element 171, and the movement of the second top driving element 171 relative to the second end cover 130 in the radial direction of the shell 110 is achieved by the movement of the second top driving element 171 relative to the second connecting seats 172 in the radial direction of the shell 110, so that the movement of the second end cover 130 in the radial direction of the shell 110 forced by the second top driving element 171 can be achieved.

[0084] The second connecting seats 172 can be fixed to the second end cover 130 through second fixing members 173, and the second fixing members 173 can be bolts, screws or other fixing members. In other embodiments, the second connecting seats 172 can also be fixed to the second end cover 130 through welding or other ways, or the second connecting seats 172 are part of the second end cover 130.

[0085] Again referring to Figure 1 , Figure 3 and Figure 9 , in one embodiment, the second connecting seats 172 comprise first connecting portions 1721 and second connecting portions 1722 perpendicular to each other, the first connecting portions 1721 are fixed to the second end cover 130 on the side axially away from the shell 110, and the second connecting portions 1722 are located on the radial outer side of the shell 110 and are arranged in a spaced manner with the outer circumferential surface of the shell 110; the second top driving element 171 is connected to the second connecting portions 1722, and the second top driving element 171 is configured to be movable relative to the second connecting portions 1722 in the radial direction of the shell 110 to top the outer circumferential surface of the shell 110.

[0086] In one embodiment, the second top driving element 171 comprises a second top driving bolt, and the second connecting seat 172 is provided with an internal thread, and the cooperation of the second top driving bolt and the internal thread of the second connecting seat 172 achieves the movement of the second top driving bolt relative to the second end cover 130.

[0087] In the embodiment, the second top driving element 171 is threadedly connected with the second connecting seat 172, so that the movement of the second top driving element 171 relative to the second connecting seat 172 can be realized by screwing the second top driving element 171, and after the second top driving element 171 is loosened, the second top driving element 171 can still keep the locked state with the second connecting seat 172, that is, the second top driving element 171 can still keep the radial support of the second end cover 130.

[0088] Referring again to Figure 6 and Figure 7 In one embodiment, the first end cover 120 is provided with a first scale line 124 on the surface of the shell 110 in the axial direction of the shell 110, please refer to Figure 11 , Figure 11 is Figure 7 the first end cover 120 at the first scale line 124, and the first scale line 124 is used to read the distance of the movement of the shell 110 relative to the first end cover 120 in the radial direction of the shell 110. Specifically, after the radial movement of the shell 110 relative to the first end cover 120, the edge of the annular boss 111 can coincide with a certain scale of the first scale line 124, so as to read the position of the shell 110 relative to the first end cover 120.

[0089] The first scale line 124 can at least have a 0 mark line, and the meaning of the 0 mark line is that the stator 140 is in the original concentric initial state, that is, the state that the stator and the rotor are not eccentric, and the position of the edge of the annular boss 111 on the first end cover 120. In the embodiment, by providing the first scale line 124, the distance of the movement of the shell 110 relative to the first end cover 120 can be conveniently read, and after the stator 140 and the rotor 150 are assembled, the concentric initial state of the stator 140 can be adjusted, so as to ensure that the assembly effect of the stator 140 is consistent with the original state, and the different eccentric amounts of the stator and the rotor can be adjusted by adjusting the position of the shell 110 relative to the first end cover 120 and the position of the second end cover 130 relative to the shell 110.

[0090] Referring again to Figure 7 , along the circumferential direction of the first end cover 120, a plurality of first scale lines 124 can be provided to more accurately read the distance of the movement of the shell 110 relative to the first end cover 120 in the radial direction of the shell 110.

[0091] In other embodiments, the first scale line 124 can also not be provided on the first end cover 120, and other ways can be used to read the distance of the movement of the shell 110 relative to the first end cover 120 in the radial direction of the shell 110, for example, the number of turns of the first top driving assembly 160.

[0092] In one embodiment, in order to achieve the coarse positioning of the housing 110 relative to the first end cover 120 when the housing 110 is installed to the first end cover 120, a sinking area 125 can also be provided on the face of the first end cover 120 facing the housing 110, and the first scale line 124 can be provided on the sinking area 125 close to the edge, and the annular boss 111 can be clamped into the sinking area 125, so as to achieve the coarse positioning of the annular boss 111 in the radial direction of the housing 110 relative to the first end cover 120.

[0093] In one embodiment, the second end cover 130 is provided with a second scale line on the face in the axial direction of the housing 110, and the second scale line is used to read the distance of the second end cover 130 moving in the radial direction of the housing 110 relative to the housing 110, and the second scale line can be provided on the face of the second end cover 130 facing the housing 110 in the axial direction of the housing 110.

[0094] In the embodiment, by providing the second scale line on the second end cover 130, the distance of the second end cover 130 moving in the radial direction of the housing 110 relative to the housing 110 is facilitated to be read. In the case that the first scale line 124 is provided on the first end cover 120, the first scale line 124 and the second scale line can be used to obtain the eccentricity of the stator and the rotor. For example, the housing 110 is first moved by 0.5 mm in the radial direction of the housing 110 (obtained by reading the first scale line 124), and the second end cover 130 is synchronously moved by 0.5 mm, at this time, if the second end cover 130 is moved back by 0.5 mm (obtained by reading the second scale line), the motor air gap eccentricity simulation device 100 of the application can be used to simulate the parallel eccentricity fault condition, and if the second end cover 130 is moved back by 0.2 mm (obtained by reading the second scale line), the motor air gap eccentricity simulation device 100 of the application can be used to simulate the inclined eccentricity fault condition.

[0095] Continuing to refer to Figure 1 and Figure 10 In one embodiment, the second end cover 130 is provided with a measuring hole 132, the measuring hole 132 is in communication with the installation cavity 1100, and the measuring hole 132 is configured to be inserted by a measuring tool to measure the eccentricity of the rotor 150 relative to the stator 140, and the measuring tool can be a micrometer or other manual measuring tool for measuring the gap size. The measuring hole 132 is at least aligned with the air gap between the stator 140 and the rotor 150 in the radial direction of the housing 110, so as to facilitate the measuring tool to be inserted into the air gap between the stator 140 and the rotor 150, thereby measuring the eccentricity of the rotor 150 relative to the stator 140.

[0096] Further, the number of the measuring holes 132 on the second end cover 130 is multiple, and the multiple measuring holes 132 are distributed along the circumference of the second end cover 130. In the embodiment, the number of the measuring holes 132 on the second end cover 130 is multiple, so that the eccentricity of the rotor 150 relative to the stator 140 at different positions in the circumferential direction can be measured, and more comprehensive data of the eccentricity can be obtained. Figure 1 and Figure 10 It is shown that the number of the measuring holes 132 on the second end cover 130 is four, and it can be understood that in other embodiments, the number of the measuring holes 132 on the second end cover 130 can also be other numbers. The specific shape of the measuring holes 132 on the second end cover 130 is not limited in the present application, which can be a rectangle as shown in Figure 1 and Figure 10 , a circle, a triangle, or a polygon, etc., and the shape is subject to the convenience of inserting the measuring tool and measuring the size of the air gap between the stator 140 and the rotor 150.

[0097] In one embodiment, referring again to Figure 3 , the first end cover 120 is fixed with the first bearing seat 121 in the mounting cavity 1100, the second end cover 130 is fixed with the second bearing seat 133 in the mounting cavity 1100, and one end of the rotor 150 is installed on the first bearing seat 121 through the first bearing 122, and the other end of the rotor 150 is installed on the second bearing seat 133 through the second bearing 134. In this way, the rotor 150 is rotatably connected to the first end cover 120 at one end and rotatably connected to the second end cover 130 at the other end.

[0098] In some embodiments, the second end cover 130 is further provided with a rotary transformer 131, which can be used to accurately measure the position, speed and rotation direction of the rotor 150, and convert these information into signals to feed back to the control system of the motor air gap eccentricity simulation device 100, so as to realize accurate control of the motor air gap eccentricity simulation device 100. Specifically, the rotary transformer 131 is also a small motor, which includes a stator, a rotor and a winding coil. The stator of the rotary transformer 131 is fixed on the second end cover 130, and the rotor of the rotary transformer 131 is fixed on the rotor 150 of the simulation tool and rotates synchronously with it. Since the rotary transformer 131 is used to measure the position, speed and rotation direction of the motor rotor, which is a well-known technology in the field of motors, the structure, principle and function of the rotary transformer 131 will not be described here.

[0099] The terms "first", "second", "third", etc. in the present application are only used for descriptive purpose and cannot be understood as indicating the number of the technical features indicated. Thus, the features defined with "first", "second", "third" can include at least one of the features explicitly or implicitly. All directional indications, such as upper, lower, left, right, front, back, etc., in the present application are only used for explaining the relative position relationship, movement condition, etc. between the components, if the specific posture (as shown in the drawings) is changed, the directional indications will also change accordingly. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover the non-exclusive inclusion.

[0100] The above only describes the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An electric machine air gap eccentricity simulation device, characterized by, The motor comprises a housing, a stator, a rotor, a first end cover, a second end cover, a first top driving assembly and a second top driving assembly. The first end cover and the second end cover are respectively connected to the axial two ends of the housing, the housing can move relative to the first end cover along the radial direction of the housing and is locked to the first end cover, and the second end cover can move relative to the housing along the radial direction of the housing and is locked to the housing. The stator and the rotor are located in the housing, the stator is sleeved outside the rotor and is fixed to the housing, one end of the rotor in the axial direction is rotationally connected to the first end cover, and the other end is rotationally connected to the second end cover. The first top driving assembly comprises a plurality of first top driving elements distributed circumferentially along the housing, the first top driving elements are connected to the first end cover, and the first top driving elements are configured to move relative to the first end cover along the radial direction of the housing to drive the housing, so that the housing moves relative to the first end cover along the radial direction of the housing. The second top driving assembly comprises a plurality of second top driving elements distributed circumferentially along the housing, the second top driving elements are connected to the second end cover, and the second top driving elements are configured to move relative to the second end cover along the radial direction of the housing to drive the housing, so that the second end cover moves relative to the housing along the radial direction of the housing.

2. The motor air gap eccentricity simulation device according to claim 1, wherein The first top driving assembly further comprises a plurality of first connecting seats, the first connecting seats are fixed to the side of the first end cover facing the housing in the axial direction of the housing, and the first top driving elements are connected to the first end cover through the first connecting seats.

3. The motor air gap eccentricity simulation device according to claim 2, wherein The housing is fixedly connected with an annular boss, and the annular boss is located at the end of the housing facing the first end cover; The first connecting seats are located outside the annular boss in the radial direction of the housing, and the first top driving elements are configured to move relative to the first end cover along the radial direction of the housing to drive the outer circumferential surface of the annular boss.

4. The motor air gap eccentricity simulation device according to claim 2 or 3, wherein The first top driving elements comprise first top driving bolts, the first connecting seats are provided with internal threads, and the cooperation between the first top driving bolts and the internal threads realizes the movement of the first top driving bolts relative to the first end cover.

5. The motor air gap eccentricity simulation device according to claim 1, wherein The second top driving assembly further comprises a plurality of second connecting seats, the second connecting seats are fixed to the side of the second end cover away from the housing in the axial direction of the housing, and the second top driving elements are connected to the second end cover through the second connecting seats.

6. The motor air gap eccentricity simulation device according to claim 5, wherein The second connecting seat comprises a first connecting portion and a second connecting portion which are perpendicular to each other, the first connecting portion is fixed to a side of the second end cover which is axially away from the shell, and the second connecting portion is located radially outside the shell and is spaced apart from the outer circumferential surface of the shell; The second top element is connected to the second connecting portion, and the second top element is configured to be movable along the radial direction of the shell relative to the second connecting portion to top the outer circumferential surface of the shell.

7. The motor air gap eccentricity simulation device according to claim 5 or 6, wherein The second top element comprises a second top bolt, the second connecting seat is provided with an internal thread, and the cooperation between the second top bolt and the internal thread realizes the movement of the second top bolt relative to the second end cover.

8. The motor air gap eccentricity simulation device according to claim 1, wherein The first end cover is provided with a first scale line on a side thereof which is axially towards the shell, and the first scale line is used to read the distance by which the shell is moved relative to the first end cover along the radial direction of the shell; And / or, the second end cover is provided with a second scale line on a side thereof which is axially towards the shell, and the second scale line is used to read the distance by which the second end cover is moved relative to the shell along the radial direction of the shell.

9. The motor air gap eccentricity simulation device according to claim 1, wherein The shell is fixedly connected with an annular boss which is located at an end of the shell which is towards the first end cover; A first fixing hole is formed in the annular boss, and a first locking hole is formed in the first end cover which can be axially aligned with the first fixing hole, the diameter of the first fixing hole is larger than the diameter of the first locking hole; The motor air gap eccentricity simulation device further comprises a first locking bolt, the shell can pass through the first fixing hole by the screw rod of the first locking bolt and is fastened to the first locking hole, and the head of the first locking bolt is pressed against a side of the annular boss which is away from the first end cover, so as to fasten the shell to the first end cover.

10. The motor air gap eccentricity simulation device according to claim 1 or 9, wherein A second locking hole is formed in the end surface of the shell which is towards the second end cover, and a second fixing hole is formed in the second end cover which can be axially aligned with the second locking hole, the diameter of the second fixing hole is larger than the diameter of the second locking hole; The motor air gap eccentricity simulation device further comprises a second locking bolt, the second end cover can pass through the second fixing hole by the screw rod of the second locking bolt and is fastened to the second locking hole, and the head of the second locking bolt is pressed against a side of the second end cover which is away from the shell, so as to fasten the second end cover to the shell.

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