CN113595273A - Motor and assembling method thereof - Google Patents

Abstract

The invention discloses a motor and an assembly method thereof, which aim to solve the problems that the loss of a motor stator core is increased and the motor efficiency is reduced because the conventional motor stator core and a shell are assembled in a shrink fit interference mode. The motor also comprises a motor shell which is formed by rolling plates, wherein the stator core is arranged in the motor shell, and the stator core chain is rolled along with the plates to enable the stator core chain to be connected end to form the stator core. The motor shell is formed by rolling the plate, the stator core is formed along with the plate, the assembly efficiency and the assembly precision are improved, the stress of the motor shell to the stator core is reduced, the loss of the stator core is reduced, and the motor efficiency is improved.

Description

Motor and assembling method thereof

Technical Field

The invention relates to the technical field of motors, in particular to a motor and an assembling method thereof.

Background

At present, the mainstream mode of matching a motor stator core and a shell of a compressor is hot sleeve matching, the basic size of the outer diameter of the motor stator core is slightly larger than the inner diameter of the shell, the shell is heated, the inner diameter of the shell is expanded and sleeved on the motor outer diameter core, and the assembly of the shell and a motor is completed after cooling. With the difference between the two basic dimensions, namely the interference, increasing, the firmer the two are assembled, namely the compressive stress is larger. For the silicon steel material adopted by the stator and rotor lamination of the motor, the larger the compressive stress is, the larger the energy loss of the material in a magnetic field is, the larger the iron loss of the motor is, and the lower the motor efficiency is.

Disclosure of Invention

In view of the above, the invention discloses a motor and an assembly method thereof, which are used for solving the problems that the loss of a motor stator core is increased and the motor efficiency is reduced due to the fact that the existing motor stator core and a shell are assembled in a shrink fit interference mode.

In order to achieve the above object, the invention adopts the following technical scheme:

the invention discloses a motor, which comprises a plurality of stator core units with stator yoke parts, wherein the stator core units on the plurality of stator core units are hinged from head to tail to form a stator core chain, and the head and tail ends of the stator core chain are fixedly connected to form a stator core.

Further, the difference between the stator core circumference length L1 and the dimension L2 of the plate in the stator core chain length direction satisfies: L1-L2 is more than 0 and less than or equal to 0.025 mm.

Further, any stator core unit still has stator tooth, stator yoke portion is equipped with stator tooth, be equipped with on the excircle border of stator yoke portion along the first breach that stator yoke portion thickness direction extends, first breach with stator tooth sets up relatively, the width of first breach along the protruding direction of stretching of stator tooth grow gradually.

Further, the maximum width b2 of the first notch is smaller than the width b3 of the stator teeth, i.e. b2< b 3.

Further, the ratio of the maximum width b2 of the first notch to the minimum width b1 thereof satisfies: b2/b1 is less than or equal to 1.4.

Furthermore, the two sides of the first notch on the outer circle edge of the stator yoke part are respectively provided with a second notch with the same extending direction as the first notch.

Furthermore, third notches are respectively arranged on two sides of the first notch on the outer circle edge of the stator yoke part, and the first notch, the second notch and the third notch are used for dispersing concentrated stress acting on the stator yoke part;

the third gap forms a first edge on the outer circle edge of the stator yoke, and the distance between the outer circle edge of the stator yoke and the first edge is 0.1mm-0.5 mm.

Furthermore, the first notch is located on a center line of the protruding direction of the stator tooth portion, and the second notch and the third notch on two sides of the first notch are symmetrically arranged relative to the center line of the protruding direction of the stator tooth portion.

Further, a minimum distance w1 from the edge of the first notch to the stator tooth root is greater than or equal to a minimum distance w2 from the edge of the third notch to the stator tooth root.

The invention discloses a second aspect of an assembly method of a motor, which comprises the following steps:

a plurality of stator core lamination sheets are laminated to form a plurality of stator core units with the stator yoke parts hinged end to end, and a plurality of stator core units form a stator core chain, or the plurality of stator core lamination sheets are laminated to form a plurality of stator core units, and the stator yoke parts of the plurality of stator core units are hinged end to form a stator core chain;

winding the stator teeth on the stator core chain; after winding is finished, the stator core chain is placed on a plate, and the outer circle edge of a stator yoke part of the stator core chain faces one side of the plate;

the plate is rolled along the circumferential direction of the edge of the excircle of the stator yoke part to form a cylindrical motor shell, and the stator core chain is connected with the two ends of the stator core chain along with the rolling of the plate and fixed together;

and fixing the rolled butt joint of the cylindrical motor shell.

Has the advantages that: the motor shell and the stator core are rolled and formed together, so that the influence of pressure stress and thermal stress on the stator core can be effectively reduced, and meanwhile, the stator core chain is rolled and formed together with the plate, so that the coaxiality is better, the assembly error is reduced, and the assembly efficiency is improved.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.

Fig. 1 shows a schematic view of stator core chains placed on a plate in embodiments 1 and 2;

fig. 2 is a schematic view showing a stator core formed in a motor case in embodiments 1 and 2;

fig. 3 shows a schematic view of a stator core unit in embodiment 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

Current motor casing and stator core adopt interference fit, through to the heating of motor casing adopt the thermal expansion will stator core packs into, and motor thermal stress and compressive stress are great in the assembling process, make the iron loss increase of motor stator yoke portion. In contrast, the motor shell is manufactured in a plate rolling mode, the chain type stator core chain is placed in the plate and rolled along with the plate, the two ends of the stator core chain are in butt joint, and meanwhile, the notch is formed in the edge of the excircle of the yoke part of the stator core, so that the compression stress of multiple stator cores of the motor shell is reduced, and the iron loss of the stator yoke part of the motor is reduced.

To further illustrate the technical solution of the present invention, the following specific examples are provided with reference to fig. 1 to 3.

Example 1

In this embodiment, a motor is provided, as shown in fig. 1 and fig. 2, including a plurality of stator core units 10 having stator yoke portions a, the stator yoke portions a on the plurality of stator core units 10 are hinged end to form a stator core chain, the end to end of the stator core chain is fixedly connected to form a stator core 100, the motor further includes a motor housing 20 formed by rolling a plate C, the stator core 100 is disposed in the motor housing 20, the stator core chain is rolled along with the plate C to form the stator core 100 by end to end connection, wherein after the plate is rolled to form the motor housing 20, a butt joint can be fixed by welding, in this embodiment, the end to end portions of the stator core chain are rolled along with the plate C, and both ends are butted together, thereby avoiding the stator core chain from being welded, and reducing iron loss of the stator core, and meanwhile, the rolled motor shell and the stator core are integrally formed, so that the installation efficiency, the installation precision and the motor efficiency are improved, and the increase of the iron loss of the stator core due to the adoption of thermal expansion type interference assembly is avoided.

Alternatively, the plate C may be a square plate or a rectangular plate.

This embodiment need not weld stator core body, only need weld the casing, avoids the aggravation of the dimensional deviation between each stator core unit 10 that welded stator core brought, and the size such as axiality, circularity in the assembly process is held in the thermal stress that significantly reduces effectively alleviating, easily assembles, improves uniformity and stability.

In this embodiment, the stator core and the motor housing are in interference fit. Optionally, the difference between the stator core circumference L1 and the dimension L2 of the plate along the length direction of the stator core chain satisfies: 0< L1-L2 is less than or equal to 0.025mm, so that the outer diameter of the stator core is larger than the inner diameter of the motor shell 20 to form interference fit.

Adopt the interference mode assembly of integral iron core through thermal expansion among the prior art, there is stress concentration's phenomenon in receiving from casing compressive stress, adopt chain stator core structure in this embodiment, every stator core unit 10 can relieve stress concentration.

In order to further distribute the stress from the motor housing 20, the present embodiment provides a notch in the stator yoke B. Specifically, as shown in fig. 3, any one of the stator core units 10 further includes a stator tooth portion B, the stator yoke a is provided with the stator tooth portion B, the stator tooth portion B is provided on one side of an outer circumferential edge of the stator yoke a, a first notch a2 extending in an axial direction of the outer circumferential edge of the stator yoke a is provided on the outer circumferential edge of the stator yoke a, the first notch a2 is provided opposite to the stator tooth portion B, and a width of the first notch a2 gradually increases along a protruding direction of the stator tooth portion B. When the motor runs, the first notch A2 circulates air, on one hand, the temperature of the stator core is reduced, on the other hand, the stress of the motor shell is dispersed to the two sides of the first notch A2, and the stress is prevented from being concentrated too much.

Preferably, the edge of the stator yoke portion a on the side connected with the stator tooth portion B is a straight edge, so that winding is facilitated.

Further, as shown in fig. 3, the maximum width b2 of the first notch is smaller than the width b3 of the stator teeth, i.e., b2< b 3. Alternatively, the first notch a2 may be shaped as a dovetail. The area of the contact part of the outer circle edge of the stator yoke part A relative to the stator tooth part B and the motor shell 20 is reduced, and the deformation degree of two sides of the stator yoke part A is increased, so that the stress of the contact surfaces close to two ends of the first notch A2 is buffered and restrained. At the same time, the first gap a2 should not be too wide, i.e. b2< b3, to avoid affecting the yoke magnetic circuit. The ratio of the maximum width b2 of the first notch to the minimum width b1 thereof satisfies: b2/b1 is not more than 1.4, which is the best mode of the embodiment.

In order to further distribute the stress of the motor housing on the stator core, specifically, as shown in fig. 3, second notches A3 are respectively arranged on two sides of the first notch a2 on the outer circumferential edge of the stator yoke portion a, and the extending directions of the second notches A3 are the same as the extending directions of the first notches a 2.

Further, as shown in fig. 3, third notches are respectively disposed on two sides of the first notch a2 on the outer circumferential edge of the stator yoke a, and the first notch a2, the second notch A3 and the third notches are used for dispersing the concentrated stress acting on the stator yoke a.

Further, as shown in fig. 3, in order not to affect the magnetic circuit of the stator yoke a, as shown in fig. 3, the third notch forms a first edge a4 on the outer circumferential edge of the stator yoke a, and the distance L between the outer circumferential edge of the stator yoke a and the first edge a4 is 0.1mm to 0.5 mm.

Further, as shown in fig. 3, the first notch a2 is located on a center line of the stator tooth portion B in the protruding direction, and the second notch A3 and the third notch on both sides of the first notch a2 are respectively arranged symmetrically with respect to the center line of the stator tooth portion B in the protruding direction.

The second notch A3 and the third notch on the same side of the first notch A2 divide the outer circle edge into two outer circle edges a and b with the same arc length. Preferably, the second notch a3 is a concave semi-circular arc through groove, and the semi-circular arc through groove and the circular arc transition of the excircle edge can reduce stress concentration.

Further, as shown in fig. 3, a minimum distance w1 from the edge of the first notch a2 to the root of the stator tooth B is greater than or equal to a minimum distance w2 from the edge of the third notch to the root of the stator tooth B.

Further, as shown in fig. 3, the stator core unit is formed by laminating a plurality of stator core laminations, each stator core lamination is provided with a long slot e on one side of the position of the stator tooth portion B and the position of the stator yoke portion a, a protrusion in a shape matched with the long slot e is arranged on the other side of the position opposite to the long slot e, and when the plurality of stator core laminations are laminated together, the long slot e on the stator core lamination is laminated and buckled with the protrusion on the adjacent stator core lamination;

the length direction of the stator tooth part B is consistent with the length direction of the long slot e;

the number of the long grooves e of the stator yoke portion A is 2, the long grooves e are symmetrically arranged on two sides of the stator tooth portion B and are arranged in an outward inclined mode relative to the stator tooth portion B.

The stress direction of the stator core is consistent with the length direction of the long groove e or the bulge, the internal stress of the stator core is reduced, the iron loss of the stator core is further reduced, and the performance of the motor is improved.

Preferably, the head end and the tail end of the stator core chain are fixed in a clamping mode. As shown in fig. 3, in particular, a protrusion q1 along the circumferential direction of the stator core is provided at one end of the stator core chain, and a groove q2 along the circumferential direction of the stator core is provided at the other end of the stator core chain, and when the two ends of the stator core chain are butted, the protrusion q1 and the groove q2 are clamped together to form the stator core.

Example 2

In this embodiment, an assembling method of the motor described in embodiment 1 is provided, and as shown in fig. 1 and fig. 2, the assembling method specifically includes:

a plurality of stator core units 10 with the stator yoke parts A hinged end to end are formed by laminating a plurality of stator core laminations, a plurality of stator core units 10 form a stator core chain, or a plurality of stator core units 10 are formed by laminating a plurality of stator core laminations, and the stator yoke parts A of the plurality of stator core units 10 are hinged end to form a stator core chain;

winding the stator teeth B on the stator core chain; after winding is finished, the stator core chain is placed on a plate C, and the outer circle edge of a stator yoke part A of the stator core chain faces one side of the plate C;

the plate C is rolled along the circumferential direction of the edge of the excircle of the stator yoke part A to form a cylindrical motor shell 20, and the head end and the tail end of the stator core chain are connected and fixed together along with the rolling of the plate C;

the rolled butt joint of the cylindrical motor housing 20 is fixed, preferably by welding.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (10)

1. The motor is characterized in that the motor further comprises a motor shell formed by rolling plates, the stator core is arranged in the motor shell, and the stator core chain is rolled with the plates to enable the stator core chain to be connected end to form the stator core.

2. An electric machine as claimed in claim 1, wherein the difference between the stator core circumference L1 and the dimension L2 of the plates along the length of the stator core chain is such that: L1-L2 is more than 0 and less than or equal to 0.025 mm.

3. The motor according to claim 2, wherein any one of the stator core units further has stator teeth, the stator yoke is provided with the stator teeth, the outer circumferential edge of the stator yoke is provided with a first notch extending in the thickness direction of the stator yoke, the first notch is arranged opposite to the stator teeth, and the width of the first notch is gradually increased along the protruding direction of the stator teeth.

4. An electric machine as claimed in claim 3, characterized in that the maximum width b2 of the first recess is smaller than the width b3 of the stator teeth, i.e. b2< b 3.

5. An electric machine as claimed in claim 4, characterized in that the ratio of the maximum width b2 of the first gap to its minimum width b1 is such that: b2/b1 is less than or equal to 1.4.

6. An electric machine as claimed in any of claims 3 to 5, characterized in that the outer circumferential edge of the stator yoke is provided with second notches on both sides of the first notch, respectively, in the same direction as the first notch.

7. The motor of claim 6, wherein the outer circumference of the stator yoke is further provided with third notches on both sides of the first notch, and the first notch, the second notch and the third notch are used for dispersing the concentrated stress acting on the stator yoke;

the third gap forms a first edge on the outer circle edge of the stator yoke, and the distance between the outer circle edge of the stator yoke and the first edge is 0.1mm-0.5 mm.

8. The motor according to claim 7, wherein the first notch is located at a center line in a projecting direction of the stator teeth, and the second notch and the third notch on both sides of the first notch are symmetrically arranged with respect to the center line in the projecting direction of the stator teeth.

9. The electric machine of claim 7 wherein the minimum distance w1 from the edge of said first notch to the root of said stator teeth is greater than or equal to the minimum distance w2 from the edge of said third notch to the root of said stator teeth.

10. A method of assembling an electrical machine according to any of claims 1 to 9, comprising:

a plurality of stator core lamination sheets are laminated to form a plurality of stator core units with the stator yoke parts hinged end to end, and a plurality of stator core units form a stator core chain, or the plurality of stator core lamination sheets are laminated to form a plurality of stator core units, and the stator yoke parts of the plurality of stator core units are hinged end to form a stator core chain;

winding the stator teeth on the stator core chain; after winding is finished, the stator core chain is placed on a plate, and the outer circle edge of a stator yoke part of the stator core chain faces one side of the plate;

the plate is rolled along the circumferential direction of the edge of the excircle of the stator yoke part to form a cylindrical motor shell, and the stator core chain is connected with the two ends of the stator core chain along with the rolling of the plate and fixed together;

and fixing the rolled butt joint of the cylindrical motor shell.

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