Motor stator and motor

Abstract

The present invention discloses a motor stator and a motor, belonging to the technical field of motors. The motor stator comprises a stator core and an insulating frame, wherein the stator core has a core end face, the insulating frame has a frame end face, and a return groove is arranged on the outer periphery of the stator core; the motor stator also comprises a connection structure, wherein the connection structure comprises: a connection groove, which is arranged along the outer peripheral edge of the stator core at one end of the return groove along the axial direction, one end of the connection groove is connected to the core end face, and the other end is connected to the return groove; a connection protrusion, which is arranged to protrude outwardly along the outer peripheral edge of the insulating frame and protrudes from the frame end face in the axial direction of the insulating frame, and an avoidance groove which passes through the connection protrusion is arranged on the outer periphery of the connecting protrusion along the axial direction of the insulating frame, and the connecting protrusion can be inserted into the connecting groove to achieve matching, and the avoidance groove can be connected to the return groove. It can realize the stable fixation of the stator core and the insulating frame, and does not block the flow of the return groove, thereby ensuring the performance of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of electric motors, and in particular to a motor stator and a motor. Background Art

[0002] In order to miniaturize the motor and increase the power, it is expected to increase the slot fill rate of the stator winding. Usually, a circular groove is provided on the end face of the tooth portion of the stator core, the end face of the yoke portion, or the end face of the connection between the tooth portion and the yoke portion (i.e., the root of the tooth), and at the same time, a cylindrical or conical protrusion is provided at the corresponding position of the end face of the insulating skeleton. The insulating skeleton is fixed to the stator core by the engagement of the groove and the protrusion. This prevents the stator core and the insulating skeleton from shifting.

[0003] However, this fixed form has the following defects:

[0004] 1) Each tooth unit of the stator core is provided with at most one groove for fixing the insulating frame to the end face of the stator core. In order to minimize the loss of magnetic flux, the groove is too small, which may cause the insulating frame to be unable to be fully fixed to the end face of the stator core, and may shake or even fall off due to instability.

[0005] 2) When winding on an insulating frame that cannot be fully fixed on the end face of the stator core, the insulating frame is easily deformed and damaged due to the stress of the winding, and the front end of the teeth of the insulating frame is easily lifted, affecting the slot fill rate and thus affecting the motor performance.

[0006] 3) Grooves are opened at the teeth, yoke, tooth roots and other locations with high magnetic density of the stator core, which leads to increased iron loss. The higher the magnetic density, the greater the iron loss.

[0007] 4) Opening grooves at locations with high magnetic density such as the teeth, yoke, and tooth roots of the stator core will hinder the flow of magnetic lines of force and affect the performance of the motor. Summary of the invention

[0008] The purpose of the present invention is to provide a motor stator and a motor, which can achieve stable fixation of the stator core and the insulating frame, and has small iron loss and avoids affecting the flow of magnetic lines of force.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] A motor stator comprises a stator core and an insulating frame arranged at the end of the stator core, wherein the stator core has a core end face at the axial side, the insulating frame has a frame end face at a position corresponding to the core end face, and a return groove is arranged along the axial direction on the outer periphery of the stator core; the motor stator also comprises a connecting structure for connecting the stator core and the insulating frame so that the core end face and the frame end face are fitted together;

[0011] The connection structure comprises:

[0012] A connecting groove is provided along the outer peripheral edge of the stator core at one end of the return groove in the axial direction, one end of the connecting groove is connected to the core end surface, and the other end is connected to the return groove, and the length of the connecting groove along the circumference of the stator core is greater than the width of the return groove;

[0013] A connecting protrusion protrudes outward along the outer peripheral edge of the insulating skeleton and protrudes from the end face of the skeleton in the axial direction of the insulating skeleton. An avoidance groove that passes through the connecting protrusion is opened on the outer periphery of the connecting protrusion along the axial direction of the insulating skeleton. The connecting protrusion can be inserted into the connecting groove to achieve cooperation, and the avoidance groove can be connected to the reflux groove.

[0014] The area where the connecting groove is located does not exceed the area S, wherein the two side edges of the area S are respectively the extension line L1 of the oc line and the extension line L2 of the od line, the inner edge of the area S close to the center of the stator core is the circle d1 with ob as the radius, and the outer edge of the area S away from the center of the stator core is the outer periphery of the stator core; wherein,

[0015] o is the center of the stator core;

[0016] H is the width of the teeth of the stator core;

[0017] a is the midpoint of the bottom of the inter-tooth slot of the stator core;

[0018] b is the position after the line oa is extended by H / 2;

[0019] c is an end point of the tooth portion away from the fillet at the root of one side of the tooth portion of the stator core;

[0020] d is an end point of a fillet at the tooth root on the other side of the tooth portion of the stator core away from the tooth portion.

[0021] Wherein, the connecting protrusion comprises:

[0022] A first connection portion is protruded outwardly along the outer peripheral edge of the insulating frame, and the bottom surface of the first connection portion is flush with the end surface of the frame;

[0023] A second connecting portion, one end of which is connected to the suspended end of the first connecting portion, and the other end of which is arranged to protrude from the end surface of the insulating frame along the axial direction of the insulating frame;

[0024] The avoidance groove passes through the first connection portion and the second connection portion.

[0025] Among the first connection part and the second connection part, at least the length of the second connection part along the circumference of the insulating skeleton is adapted to the length of the connection groove along the circumference of the stator core.

[0026] Wherein, the distance from the bottom surface of the first connecting portion to the end of the second connecting portion along the axial direction of the insulating frame is adapted to the depth of the connecting groove along the axial direction of the stator core.

[0027] Wherein, the first connecting portion and the second connecting portion are integrally formed.

[0028] Wherein, the connecting protrusion and the insulating frame are integrally formed.

[0029] There are at least two connection structures, and at least two connection structures are evenly distributed on the periphery of the stator core and the insulating frame.

[0030] An electric motor comprising the electric motor stator.

[0031] The beneficial effects of the present invention are:

[0032] The motor stator and the motor of the present invention are provided with a connecting groove on the outer periphery of the stator iron core, a connecting protrusion is arranged on the outer periphery of the insulating frame, and the connecting protrusion is inserted into the connecting groove to achieve stable fixation of the two, thereby avoiding shaking and falling off. Since the connecting protrusion and the connecting groove are both located on the outer periphery, and the connecting groove is located at one end of the reflux groove, the magnetic density at the location of the reflux groove is small, and the iron loss is small, thereby ensuring that the opening size of the connecting groove is large, and then the matching area of ​​the connecting protrusion and the connecting groove is large enough, so that the connection stability is further guaranteed, and the increase of iron loss can be effectively avoided. In addition, an avoidance groove is provided on the outer periphery of the connecting protrusion. When the connecting protrusion is placed in the connecting groove, the avoidance groove and the reflux groove are connected, which not only ensures the smooth circulation of oil, but also simplifies the entire structure and does not increase the processing of the stator iron core at other positions, thereby reducing the iron loss well and ensuring the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the motor stator provided by the present invention;

[0034] Figure 2 yes Figure 1 A schematic diagram of a top view structure of a motor stator;

[0035] Figure 3 yes Figure 1 Schematic diagram of the exploded structure of the motor stator;

[0036] Figure 4 yes Figure 1A schematic diagram of the front three-dimensional structure of the insulating skeleton;

[0037] Figure 5 yes Figure 1 A schematic diagram of the back three-dimensional structure of the insulating skeleton;

[0038] Figure 6 yes Figure 1 A schematic diagram of the three-dimensional structure of the stator core;

[0039] Figure 7 yes Figure 6 A schematic diagram of the top view structure of the stator core;

[0040] Figure 8 yes Figure 7 A partial schematic diagram of .

[0041] In the figure:

[0042] 1-stator core; 11-yoke; 12-tooth; 13-tooth front end; 14-inter-tooth slot; 15-return slot; 16-core end face;

[0043] 2-insulating skeleton; 21-skeleton outer wall; 22-skeleton teeth; 23-skeleton inner wall; 24-skeleton groove; 25-skeleton end face;

[0044] 3-Connection groove;

[0045] 4-connecting protrusion; 41-first connecting portion; 42-second connecting portion; 43-avoidance groove. DETAILED DESCRIPTION

[0046] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0048] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; 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 the present invention can be understood according to specific circumstances.

[0049] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] The following is combined with Figure 1-8 The technical solution of the present invention is further illustrated by specific implementation methods.

[0051] The present invention provides a motor, which includes a motor stator. Figures 1 to 3 As shown, the motor stator provided by the present invention comprises a stator core 1 and an insulating frame 2 arranged at the end of the stator core 1. The insulating frame 2 needs to be stably fixed at the end of the stator core 1 and is wound together with the stator core 1 to form the motor stator and work together.

[0052] like Figure 3 , Figure 6 As shown, the stator core 1 includes a yoke 11 located on the outer peripheral side, a tooth portion 12 extending from the inner edge of the yoke 11 to the center thereof, an arc-shaped tooth front end 13 is provided at the suspended end of each tooth portion 12, and an inter-tooth slot 14 is formed between two adjacent tooth portions 12.

[0053] Correspondingly, if Figures 3 to 5 As shown, the insulating skeleton 2 includes a skeleton outer wall 21 located at the periphery, skeleton teeth 22 extending from the inner edge of the skeleton outer wall 21 to the center thereof, a skeleton inner wall 23 is provided at the suspended end of each skeleton tooth 22, and a skeleton groove 24 is formed between two adjacent skeleton teeth 22.

[0054] It should be noted that the skeleton outer wall 21 of the insulating skeleton 2 corresponds to the yoke 11 of the stator core 1, the skeleton teeth 22 of the insulating skeleton 2 correspond one-to-one to the tooth 12 of the stator core 1, the skeleton inner wall 23 of each skeleton tooth 22 corresponds to the tooth front end 13 of the tooth 12, and each skeleton slot 24 corresponds to an inter-tooth slot 14.

[0055] Thus, the insulating frame 2 and the stator core 1 form a good correspondence, so that the two can be well wound after being connected. During the winding process, the insulating frame 2 and the stator core 1 will be subjected to a large winding external force. In order to well fix the stator core 1 and the insulating frame 2, as shown in FIG. Figure 3 As shown, the stator core 1 has a core end face 16 on the axial side. Figure 5 As shown, the insulating frame 2 has a frame end face 25 at a position corresponding to the core end face 16; the core end face 16 and the frame end face 25 need to be fitted together to be stably fixed. After the stator core 1 is connected to the insulating frame 2, a return groove 15 is usually provided along the axial direction on the outer periphery of the stator core 1 to facilitate the circulation of condensate, oil, etc.

[0056] Further Figures 1 to 3 As shown, the motor stator also includes a connection structure for connecting the stator core 1 and the insulating frame 2. Through the connection structure, when the stator core 1 and the insulating frame 2 are matched, the core end face 16 and the frame end face 25 can be quickly fitted together.

[0057] like Figures 1 to 3 As shown, the connection structure includes a connection groove 3 and a connection protrusion 4. The connection groove 3 is opened at one end of the return groove 15 along the axial direction along the outer peripheral edge of the stator core 1, one end of the connection groove 3 is connected to the core end face 16, and the other end is connected to the return groove 15, and the length of the connection groove 3 along the circumference of the stator core 1 is greater than the width of the return groove 15; and the connection protrusion 4 is protruded outwardly along the outer peripheral edge of the insulating frame 2 and protrudes from the frame end face 25 in the axial direction of the insulating frame 2, and the outer periphery of the connection protrusion 4 is opened along the axial direction of the insulating frame 2 with an avoidance groove 43 that passes through the connection protrusion 4, and the connection protrusion 4 can be inserted into the connection groove 3 to achieve matching, and the avoidance groove 43 can be connected to the return groove 15.

[0058] The present invention provides a connection groove 3 on the periphery of the stator core 1, and a connection protrusion 4 on the periphery of the insulating frame 2, and the connection protrusion 4 is inserted into the connection groove 3 to achieve stable fixation of the two, thereby avoiding shaking and falling off. Since the connection protrusion 4 and the connection groove 3 are both located at the periphery, and the connection groove 3 is located at one end of the reflux groove 15, the magnetic density at the location of the reflux groove 15 is small, and the iron loss is small, so that the opening size of the connection groove 3 can be ensured to be large, and then the matching area of ​​the connection protrusion 4 and the connection groove 3 is large enough, so that the connection stability is further guaranteed, and the increase of iron loss can be effectively avoided. At the same time, an avoidance groove 43 is provided on the periphery of the connection protrusion 4. When the connection protrusion 4 is inserted into the connection groove 3, the avoidance groove 43 is connected to the reflux groove 15, which not only ensures the smooth circulation of the oil, but also has a simple structure, and does not require additional processing of the stator core at other positions. The existence of the reflux groove 15 is cleverly used, and then the two structures are combined, so that the iron loss can be well reduced and the performance of the motor can be guaranteed.

[0059] In addition, since the avoidance groove 43 is opened on the outer periphery of the connecting protrusion 4, the connection direction between it and the reflux groove 15 is located on the outer periphery of the connecting protrusion 4. The connection at this outer periphery makes the connection area between the two larger and the fluidity better, ensuring the long-term operation and life of the motor.

[0060] In order to achieve the connection reliability between the insulating frame 2 and the stator core 1, the present invention has at least two connection structures, and at least two connection structures are evenly distributed on the periphery of the stator core 1 and the insulating frame 2. If there are two connection structures, they are symmetrically arranged on both sides of the stator core 1 with the central axis of the stator core 1 as the center, and the two connection structures are distributed at 180°; if there are three connection structures, they are evenly distributed in an annular manner on the periphery of the stator core 1 with the central axis of the stator core 1 as the center, and the three connection structures are distributed at 120°.

[0061] like Figure 4 , Figure 5 As shown, the connecting protrusion 4 includes a first connecting portion 41 and a second connecting portion 42, wherein the first connecting portion 41 is protruded outwardly along the outer peripheral edge of the insulating frame 2, and the bottom surface of the first connecting portion 41 is flush with the frame end surface 25; one end of the second connecting portion 42 is connected to the suspended end of the first connecting portion 41, and the other end is protruded from the frame end surface 25 along the axial direction of the insulating frame 2; the avoidance groove 43 passes through the first connecting portion 41 and the second connecting portion 42. When the connecting protrusion 4 is inserted into the connecting groove 3, the frame end surface 25 cooperates with the core end surface 16, and the second connecting portion 42 is inserted into the connecting groove 3.

[0062] In order to ensure the tightness of the fit between the connecting protrusion 4 and the connecting groove 3, among the first connecting part 41 and the second connecting part 42, at least the length of the second connecting part 42 along the circumference of the insulating skeleton 2 is adapted to the length of the connecting groove 3 along the circumference of the stator core 1. The distance from the bottom surface of the first connecting part 41 to the end of the second connecting part 42 along the axial direction of the insulating skeleton 2 is adapted to the depth of the connecting groove 3 along the axial direction of the stator core 1. This arrangement allows the oil in the reflux groove to flow out from the avoidance groove 43 when passing through the connecting protrusion 4, which can not only ensure the circulation of the oil, but also ensure the connection stability of the connecting protrusion 4 and the connecting groove 3, thereby ensuring the connection stability between the insulating skeleton 2 and the stator core 1, and ensuring that the insulating skeleton 2 does not fall off or shake during winding.

[0063] In particular, the first connection portion 41 and the second connection portion 42 are integrally formed. The connection protrusion 4 is integrally formed with the insulating frame 2. The integral structure achieves structural firmness and provides a guarantee for stable connection.

[0064] In particular, if Figure 7 , Figure 8 As shown, the area where the connecting groove 3 of the present invention is located does not exceed the area S. The edges on both sides of the area S are the extension lines L1 of the line oc and L2 of the line od, respectively. The inner edge of the area S close to the center of the stator core 1 is a circle d1 with a radius ob, and the outer edge of the area S away from the center of the stator core 1 is the outer periphery of the stator core 1; wherein o is the center of the stator core 1; H is the width of the tooth portion 12 of the stator core 1; a is the midpoint of the bottom of the inter-tooth slot 14 of the stator core 1; b is the position after the line oa is extended by H / 2; c is the fillet at the root of one side of the tooth portion 12 of the stator core 1 away from one end of the tooth portion 12; d is the fillet at the root of the other side of the tooth portion 12 of the stator core 1 away from one end of the tooth portion 12.

[0065] In the present invention, when the oa connection is extended by H / 2 or more, the magnetic induction intensity is relatively small and is below 0.8T. It should be noted that 0.8T is the value of the magnetic induction intensity of the motor at rated power. When the value is not greater than 0.8T, the iron loss change is relatively small. Therefore, area S is the area with the lowest magnetic density. By setting the connection groove 3 within area S, the following advantages are achieved:

[0066] ① Reduce iron loss;

[0067] ② Make sure there is enough space in the oil return tank to ensure long-term operation and life of the motor;

[0068] ③ Ensure motor performance and effectively reduce the impact on motor magnetic properties;

[0069] ④Prevent the resin frame from shaking, falling off, deforming, or breaking;

[0070] ⑤ Ensure the slot fill rate.

[0071] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A motor stator, comprising a stator core (1) and an insulating frame (2) arranged at an end of the stator core (1), wherein the stator core (1) has a core end face (16) at an axial side, the insulating frame (2) has a frame end face (25) at a position corresponding to the core end face (16), and a return groove (15) is arranged on the outer periphery of the stator core (1) along the axial direction; It is characterized in that The motor stator also includes a connection structure for connecting the stator core (1) and the insulating frame (2) so that the core end surface (16) and the frame end surface (25) are in close contact with each other; The connection structure comprises: A connecting groove (3) is provided along the outer peripheral edge of the stator core (1) at one end of the return groove (15) in the axial direction, one end of the connecting groove (3) is connected to the core end surface (16), and the other end is connected to the return groove (15), and the length of the connecting groove (3) along the circumference of the stator core (1) is greater than the width of the return groove (15); A connecting protrusion (4) is protruded outwardly along the outer peripheral edge of the insulating frame (2) and protrudes from the frame end face (25) in the axial direction of the insulating frame (2); an avoidance groove (43) penetrating the connecting protrusion (4) is provided on the outer periphery of the connecting protrusion (4) along the axial direction of the insulating frame (2); the connecting protrusion (4) can be inserted into the connecting groove (3) to achieve matching, and the avoidance groove (43) can be connected to the reflux groove (15); The connecting protrusion (4) and the insulating frame (2) are integrally formed; There are at least two connection structures, and at least two of the connection structures are evenly distributed on the periphery of the stator core (1) and the insulating frame (2).

2. The motor stator according to claim 1, It is characterized in that The area where the connecting groove (3) is located does not exceed the area S, wherein the two side edges of the area S are respectively the extension line L1 of the line oc and the extension line L2 of the line od, the inner edge of the area S close to the center of the stator core (1) is a circle d1 with ob as the radius, and the outer edge of the area S away from the center of the stator core (1) is the outer periphery of the stator core (1); wherein, o is the center of the stator core (1); H is the width of the tooth portion (12) of the stator core (1); a is the midpoint of the bottom of the inter-tooth slot (14) of the stator core (1); b is the position after the line oa is extended by H / 2; c is an end point of a fillet at a tooth root on one side of the tooth portion (12) of the stator core (1) that is away from the tooth portion (12); d is an end point of a fillet at the tooth root on the other side of the tooth portion (12) of the stator core (1) away from the tooth portion (12).

3. The motor stator according to claim 1, It is characterized in that The connecting protrusion (4) comprises: A first connection portion (41) is protruding outwardly along the outer peripheral edge of the insulating frame (2), and the bottom surface of the first connection portion (41) is flush with the end surface (25) of the frame; A second connecting portion (42), one end of which is connected to the suspended end of the first connecting portion (41), and the other end of which is arranged to protrude from the end surface (25) of the frame along the axial direction of the insulating frame (2); The avoidance groove (43) passes through the first connecting portion (41) and the second connecting portion (42).

4. The motor stator according to claim 3, It is characterized in that Of the first connecting portion (41) and the second connecting portion (42), at least the length of the second connecting portion (42) along the circumference of the insulating frame (2) is adapted to the length of the connecting groove (3) along the circumference of the stator core (1).

5. The motor stator according to claim 3, It is characterized in that The distance from the bottom surface of the first connecting portion (41) to the end of the second connecting portion (42) along the axial direction of the insulating frame (2) is adapted to the depth of the connecting groove (3) along the axial direction of the stator core (1).

6. The motor stator according to claim 3, It is characterized in that The first connecting portion (41) and the second connecting portion (42) are integrally formed.

7. An electric motor comprising the electric motor stator according to any one of claims 1 to 6.

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