A composite slot wedge and motor having the same

Abstract

The application discloses a composite slot wedge and a motor, and relates to the technical field of motors, in particular to a composite slot wedge and a motor. The composite slot wedge comprises an insulating main body and a pole shoe; one or more pole shoes are arranged on one side or opposite sides of the insulating main body, and the outer side wall of the pole shoe is fixedly connected with the slot side wall of the open slot of the iron core; the inner side wall of the pole shoe is fixedly connected with the insulating main body to cut off the magnetic communication between the inner side wall of the pole shoe and the open slot. The iron core slot of the application is of an open slot structure, the space for wire laying is large, the wire laying of the iron core winding is facilitated, and the process difficulty of the slotting of the iron core is reduced; the pole shoe of the composite slot wedge is matched with the open slot of the iron core, can play the role of a half-open slot, and can improve the electromagnetic performance of the iron core; the pole shoes on the two sides are separated by the insulating main body, can avoid the generation of eddy current due to the communication of the pole shoes on the two sides, and can avoid the influence on the motor efficiency; the side, close to the slot bottom of the open slot, of the pole shoe is provided with the insulating main body, plays the role of insulation, and the pole shoe is fixed by the insulating main body, so that the overall rigidity of the composite slot wedge can be increased, and the insulating main body can play the limiting role on the winding.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a composite slot wedge and a motor having the same. Background Technology

[0002] The iron core in an electric motor is a crucial component of the motor's magnetic circuit. The slots in the iron core used to house the windings include three structures: open slots, semi-open slots, and closed slots. Closed slot structures are rarely used in iron cores. Open slot structures offer the advantage of easy winding placement, but the motor's electromagnetic performance is poor, and the lack of pole shoes increases air gap harmonics, increasing motor losses and reducing performance and efficiency. Semi-open slot structures have pole shoes and offer better core electromagnetic performance, but the placement of the windings is more difficult, making it challenging to use flat copper wire or shaped coils made from flat copper wire.

[0003] Semi-open slots and open slots are often matched with slot wedges. Traditional slot wedges are divided into insulating slot wedges and magnetic slot wedges. Insulating slot wedges are generally used to fix windings in semi-open slots, while magnetic slot wedges are generally used to fix windings in open slots. However, the small slot opening of a semi-open slot makes it difficult to unwind the winding. When an open slot is paired with a magnetic slot wedge, the magnetic slot wedge can act as a pole shoe, but it also generates eddy currents, causing the stator temperature to rise. If the magnetic slot wedge is disconnected, so that the slot opening of the open slot is not connected, the eddy currents generated by the magnetic slot wedge decrease, but the limiting function of the magnetic slot wedge on the winding decreases.

[0004] Therefore, how to reduce the difficulty of production while ensuring electromagnetic performance has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a composite slot wedge and a motor having the same, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A composite groove wedge of the present invention comprises:

[0008] Insulating body;

[0009] One or more pole shoes are provided on one side or opposite sides of the insulating body. The outer sidewall of the pole shoe is fixedly connected to the slot sidewall of the opening slot of the iron core adjacent to it. The inner sidewall of the pole shoe is fixedly connected to the insulating body to cut off the magnetic communication between the inner sidewall of the pole shoe and the opening slot.

[0010] Furthermore, the insulating body has a groove on one side or opposite sides, and the pole shoe is installed on the groove; the side wall of the pole shoe that connects with the side wall of the opening groove is the outer side wall of the pole shoe, and the side wall of the pole shoe that connects with the side wall of the groove is the inner side wall of the pole shoe.

[0011] Furthermore, the insulating body includes an insulating body portion and an insulating bottom portion connected together; the insulating body portion is located between the pole shoe and the groove sidewall on the far side of the opening groove, and the insulating bottom portion is located on the side of the pole shoe near the bottom of the opening groove.

[0012] Furthermore, the inner wall of the groove formed by the bottom of the insulation is a first groove wall; in the direction from the bottom of the insulation to the main body of the insulation, the first groove wall is inclined away from the bottom of the opening groove.

[0013] Furthermore, the insulating body also includes an insulating top connected to the insulating body portion, the insulating top being located on the other side of the pole shoe facing away from the bottom of the opening slot.

[0014] Furthermore, the insulating body also includes insulating ends that block the two ends of the pole shoe along its length to prevent magnetic communication between the pole shoe ends and the opening slot.

[0015] Furthermore, the outer side of the pole shoe is provided with an outwardly extending first protrusion, and the side wall of the opening groove is provided with a slot, and the first protrusion engages with the slot; the cross-sectional shape of the first protrusion is the same as the cross-sectional shape of the slot.

[0016] Furthermore, the insulating end is provided with a second protrusion corresponding to the first protrusion, and the cross-sectional shape of the second protrusion is the same as that of the first protrusion.

[0017] Furthermore, the pole shoe is provided on one side of the insulating body, and the other side of the insulating body facing away from the pole shoe is fixedly connected to the other sidewall of the opening groove.

[0018] Furthermore, the insulating body has a third protrusion on the side opposite to the pole shoe, and the third protrusion is engaged and fixed with the other side wall of the opening groove.

[0019] Furthermore, the pole shoes are provided on both opposite sides of the insulating body, and the insulating body separates the pole shoes located on opposite sides of the insulating body.

[0020] The present invention also provides an electric motor, including an iron core, wherein the iron core is provided with a plurality of open slots, and the open slots are respectively arranged in a one-to-one correspondence with composite slot wedges, wherein the composite slot wedges are as described above.

[0021] Furthermore, the front and rear ends of the insulating body extend out of the opening groove, respectively.

[0022] In summary, the technical effects and advantages of this invention are as follows:

[0023] 1. In this invention, the iron core slot is an open slot structure with a large unwinding space, which facilitates the unwinding of the iron core winding; the pole shoes of the composite slot wedge cooperate with the open slot of the iron core to play the role of a semi-open slot, which can improve the electromagnetic performance of the iron core; in addition, when pole shoes are provided on both sides of the insulating body, the pole shoes on both sides are separated by the insulating body, which can prevent the pole shoes on both sides from connecting and generating eddy currents, thus avoiding affecting the efficiency of the motor; the side of the pole shoe near the bottom of the open slot is provided with an insulating bottom, which plays an insulating role. The pole shoe is fixed by the insulating body, which can increase the overall rigidity of the composite slot wedge, and the insulating body can limit the winding.

[0024] 2. In this invention, the inner wall of the groove wall formed by the insulating bottom is the first groove wall. The force applied by the insulating bottom to the pole shoe includes the supporting force in the direction away from the bottom of the groove and the pressure pointing outward toward the groove wall of the groove. Since the pole shoe is engaged with the groove wall of the groove, the outward pressure of the insulating bottom on the pole shoe can increase the interaction force between the groove wall of the groove and the pole shoe, thereby improving the connection stability between the pole shoe and the groove.

[0025] 3. In this invention, the insulating top on the side of the pole shoe away from the bottom of the slot can further enhance the stiffness of the composite slot wedge, enabling the composite slot wedge to withstand greater forces. Furthermore, the insulating top, insulating body, and insulating bottom cooperate with each other to cover the pole shoe, thus preventing the pole shoe from deforming due to the magnetic force of the permanent magnet.

[0026] 4. In this invention, the insulating body protects both the front and rear ends of the pole shoe, preventing damage to the pole shoe during the assembly of the composite slot wedge; the front and rear ends of the insulating body extend into opening slots, and the insulating body can also limit the end winding outside the iron core.

[0027] 5. In this invention, the shape and specifications of the pole shoe and the open slot in the composite slot wedge are the same as those of the existing semi-open slot, which facilitates subsequent electromagnetic calculations. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the composite groove wedge structure in Embodiment 1 of the present invention;

[0030] Figure 2 This is a top view of the composite groove wedge in Embodiment 1 of the present invention;

[0031] Figure 3 for Figure 2 AA section view;

[0032] Figure 4 This is a schematic diagram of the assembly of the iron core and the composite slot wedge in Embodiment 1 of the present invention. Figure 1 ;

[0033] Figure 5 This is a schematic diagram of the assembly of the iron core and the composite slot wedge in Embodiment 1 of the present invention. Figure 2 ;

[0034] Figure 6 This is a schematic diagram of the opening groove in Embodiment 1 of the present invention.

[0035] Figure 7 This is a schematic diagram of the assembly of the open slot and the composite slot wedge in Embodiment 1 of the present invention;

[0036] Figure 8 for Figure 7 BB section view;

[0037] Figure 9 This is a schematic diagram of the composite groove wedge in Embodiment 2 of the present invention;

[0038] Figure 10 This is a top view of the composite groove wedge in Embodiment 2 of the present invention;

[0039] Figure 11 for Figure 10 CC section view;

[0040] Figure 12 This is a schematic diagram of the composite groove wedge in Embodiment 3 of the present invention;

[0041] Figure 13 This is a top view of the composite groove wedge in Embodiment 3 of the present invention;

[0042] Figure 14 for Figure 13 DD sectional view.

[0043] In the figure: 1. Composite groove wedge; 2. Iron core; 11. Insulation body; 12. Pole shoe; 110. Insulation body part; 111. Insulation bottom; 112. Insulation top; 113. Connecting surface; 114. Chamfered surface; 115. Second protrusion; 116. Third protrusion; 121. First protrusion; 21. Opening groove; 211. Slot. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] Example 1

[0049] This embodiment provides a composite groove wedge 1, such as Figure 1-8As shown, it includes an insulating body 11 and pole shoes 12. The insulating body 11 is the main trunk of the composite slot wedge 1, which serves to fix the pole shoes 12 on one hand and to bear the force of the winding diffusion tendency on the other. The pole shoes 12 are used to connect with the slot sidewall of the open slot 21 to form a magnetic circuit. The structure formed by the pole shoes 12 and the open slot 21 is similar to the existing semi-open slot structure. The pole shoes 12 are used to improve the electromagnetic performance of the iron core 2. Since the open slot 21 has a certain length, the insulating body 11 is elongated. Pole shoes 12 are provided on both sides of the insulating body 11. The outer sidewall of the pole shoes 12 is fixedly connected to the slot sidewall of the adjacent side of the open slot 21. The inner sidewall of the pole shoes 12 is fixedly connected to the insulating body 11 to cut off the magnetic connection between the inner sidewall of the pole shoes 12 and the open slot 21. Specifically, the insulating body 11 has grooves on both opposite sides for mounting the pole shoes 12. The sidewall of the pole shoe 12 that connects with the sidewall of the opening groove 21 is the outer sidewall of the pole shoe 12, and the sidewall of the pole shoe 12 that connects with the sidewall of the groove is the inner sidewall of the pole shoe 12. The opening groove 21 includes a bottom wall, an adjacent sidewall, and a distant sidewall. The distant sidewall and the adjacent sidewall are arranged opposite to each other and are defined by their positions relative to the pole shoe 12. The adjacent sidewall of the opening groove 21 is a sidewall that is directly fixedly connected to the outer sidewall of the pole shoe 12. When the insulating body 11 cuts off the magnetic connection between the inner wall of the pole shoe 12 and the opening slot 21, it not only cuts off the magnetic connection between the inner wall of the pole shoe 12 and the slot side wall of the opening slot 21 on the far side, but also cuts off the magnetic connection between the inner wall of the pole shoe 12 and the bottom wall of the opening slot 21 and the slot side wall of the opening slot 21 on the adjacent side.

[0050] In some embodiments of this example, the cross-section of the insulating body 11 is generally "I"-shaped, including an integrally connected insulating body portion 110, an insulating bottom portion 111, and an insulating top portion 112. The insulating body portion 110 is located between two grooves, separating two pole shoes 12 located on opposite sides of the insulating body 11; the insulating bottom portion 111 is located on the side of the pole shoe 12 closest to the bottom of the opening groove 21; and the insulating top portion 112 is located on the other side of the pole shoe 12 opposite to the bottom of the opening groove. In other embodiments of this example, the insulating body 11 does not include the insulating top portion 112, and the cross-section of the insulating body 11 is generally "⊥"-shaped.

[0051] In this embodiment, the slot on the iron core is an open slot 21 structure, which provides a large space for the winding, facilitating the winding of the iron core and reducing the manufacturing difficulty of slotting the iron core. The pole shoes 12 of the composite slot wedge 1 cooperate with the open slot 21 of the iron core 2, which can act as a semi-open slot and improve the electromagnetic performance of the iron core 2. In addition, the pole shoes 12 on both sides are separated by the insulating body 11, which can prevent the pole shoes 12 on both sides from connecting and generating eddy currents, thus avoiding affecting the efficiency of the motor. The side of the pole shoe 12 near the bottom of the open slot 21 is provided with an insulating bottom 111, which serves as insulation. The pole shoe 12 is fixed by the insulating body 11, which can increase the overall rigidity of the composite slot wedge 1. The insulating body 11 can limit the winding. The insulating top 112 can further enhance the rigidity of the composite slot wedge 1, enabling the composite slot wedge 1 to withstand greater forces. Furthermore, the insulating top 112, the insulating body 110, and the insulating bottom 111 cooperate with each other to cover the pole shoe 12, which can prevent the pole shoe 12 from being deformed by the magnetic force of the permanent magnet.

[0052] Further, the inner wall of the groove wall formed by the insulating bottom 111 is the first groove wall. From the insulating bottom 111 to the insulating main body 110, the first groove wall is inclined away from the bottom of the opening groove 21. In this embodiment, the force applied to the pole shoe 12 by the inclined insulating bottom 111 includes a supporting force away from the bottom of the opening groove 21 and a pressure pointing outwards towards the groove wall of the opening groove 21. Since the pole shoe 12 is engaged with the groove wall of the opening groove 21, the outward pressure of the insulating bottom 111 on the pole shoe 12 can increase the interaction force between the groove wall of the opening groove 21 and the pole shoe 12, thereby improving the connection stability between the pole shoe 12 and the opening groove 21. Optionally, the groove sidewall includes a first groove wall, a second groove wall, and a connecting surface 113. The first groove wall is the inner wall of the insulating bottom 111, the second groove wall is the inner wall of the insulating top 112, and the connecting surface 113 is the inner wall of the insulating main body 110. The two ends of the connecting surface 113 are respectively connected to the inner sides of the first groove wall and the second groove wall. In this embodiment, as shown... Figure 3 As shown, the second groove wall is parallel to the end face of the iron core 2, the connecting surface 113 is perpendicular to the second groove wall, and a chamfered surface 114 can be provided at the connection between the connecting surface 113 and the second groove wall. The first groove wall is inclined, and the inner side of the pole shoe 12 fits into the groove, so that the shape of the pole shoe 12 after it is fitted with the open groove 21 is the same as the shape of the existing semi-open groove, so that the subsequent electromagnetic calculation is the same as the existing calculation method, which is convenient for designers to design and select.

[0053] Specifically, the insulating body 11 also includes insulating ends that block both ends of the pole shoe 12 along its length. The insulating ends protect both ends of the pole shoe 12, preventing damage to the pole shoe 12 during the assembly of the composite slot wedge 1 into the opening slot 21. Optionally, the insulating ends extend out of the opening slot 21, and can also limit the end windings outside the core 2.

[0054] Specifically, the outer side of the pole shoe 12 is provided with an outwardly extending first protrusion 121, and the groove wall of the opening groove 21 is provided with a retaining groove 211, the first protrusion 121 engaging with the retaining groove 211; the cross-sectional shape of the first protrusion 121 is the same as the cross-sectional shape of the retaining groove 211. This application does not limit the specific shape of the first protrusion 121 of the pole shoe 12 and the retaining groove 211 of the opening groove 21, as long as there is a concave-convex fit, it can limit the positioning of the composite groove wedge 1.

[0055] Optionally, the insulating end 112 is provided with a second protrusion 115 corresponding to the first protrusion 121, and the cross-sectional shape of the second protrusion 115 is the same as that of the first protrusion 121. The second protrusion 115 serves to protect the first protrusion 121 and can prevent the first protrusion 121 from being damaged during the process of assembling the composite groove wedge 1 into the opening groove 21.

[0056] This embodiment also provides a motor, such as Figure 4 As shown, the motor can be a disc motor. Figure 5 As shown, the motor can also be a radial motor. Although radial motor windings can now be completed by welding to form lapped windings, continuous wave windings still require the use of open slot windings. That is, the composite slot wedge 1 in this embodiment is also applicable to radial motors. Specifically, as shown... Figure 4-8 As shown, the motor includes an iron core 2, on which multiple open slots 21 are evenly distributed. Each open slot 21 corresponds to a composite slot wedge 1, which is the same as the previously described composite slot wedge 1. Optionally, the front and rear ends of the insulating body 11 extend out of the open slots 21. The shape and specifications formed by the pole shoe 12 in the composite slot wedge 1 and the open slot 21 are the same as those of the existing semi-open slots, facilitating subsequent electromagnetic calculations.

[0057] Taking a disc motor as an example, the iron core 2 is first rolled or stamped, and multiple open slots 21 are machined on the iron core 2. Slots 211 are machined on both sides of the open slots 21 to facilitate the subsequent assembly of the composite slot wedge 1 and to lock the composite slot wedge 1, thus limiting its position. Because the composite slot wedge 1 itself occupies space in the open slots 21, the slots 211 are located at the upper part of the open slots 21. Optionally, the slots 211 are 1-2 mm away from the upper end face of the iron core 2, so that while the slots 211 lock the composite slot wedge 1, the composite slot wedge 1 does not occupy too much space in the open slots 21.

[0058] Next, the pole piece 12 of the composite slot wedge 1 is prepared. Optionally, the pole piece 12 is composed of a soft magnetic material, including but not limited to silicon steel sheets, SMC (soft magnetic composite material), etc.; the soft magnetic material is then formed into the pole piece 12 by methods such as riveting silicon steel sheets, self-adhesive silicon steel sheets, sintering soft magnetic composite materials, etc. The shape of the pole piece 12 matches the open slot 21 to form the same shape as the existing semi-open slot, which facilitates electromagnetic calculations and design calculations for designers.

[0059] After the pole shoe 12 is partially formed, it is placed in a molding die, and then a composite material of insulating body 11 is added to wrap the pole shoe 12. The composite material is a material with good rigidity and insulation, including but not limited to glass fiber. Subsequently, the composite groove wedge 1 is produced by molding.

[0060] In this embodiment, the pole shoe 12 and the insulating body 11 are integrated into a single unit without material fusion, thus avoiding eddy current losses caused by the soft magnetic material of the pole shoe 12 connecting with the iron core 2. Finally, the winding is placed into the open slot 21, and the composite slot wedge 1 is inserted into the open slot 21, so that the first protrusion 121 of the pole shoe 12 engages with the slot 211 of the open slot 21, completing the final assembly. The pole shoe 12, in contact with the iron core 2, forms a magnetic circuit, replacing the semi-open slot pole shoe 12. The insulating body 11 serves as the main structure of the composite slot wedge 1, capable of bearing the force of the winding's diffusion tendency.

[0061] The riveting self-locking process, core winding process, and composite material molding process involved in this technical solution are all relatively mature processes with low processing difficulty. This embodiment can solve problems such as difficulty in winding unwinding, increased air gap harmonics, and increased magnetic slot wedge eddy currents with lower cost and technical requirements.

[0062] Example 2

[0063] like Figure 9-11 As shown, the difference between this embodiment and Embodiment 1 is that: multiple pole shoes 12 are provided on both sides of the insulating body 11, and the number of pole shoes 12 is at least two. In this embodiment, there are two pole shoes 12 on each side, and the two pole shoes 12 on the same side are separated by an insulating body 11. Since the pole shoes 12 on the same side are separated by an insulating body 11, and the insulating body 11 is made of a composite material with good rigidity and insulation, it has a stronger resistance to deformation than the silicon steel sheet and SMC of the pole shoes 12. This embodiment has a stronger resistance to deformation than Embodiment 1. The other structures of this embodiment are the same as those of Embodiment 1.

[0064] Example 3

[0065] Some motors employ asymmetrical pole shoes 12 on one side of the motor stator. Therefore, such as... Figure 12-14As shown, the difference between this embodiment and Embodiment 1 is that: one side of the insulating body 11 is provided with a pole shoe 12, and the number of pole shoes 12 can be arbitrary. In this embodiment, there is one pole shoe 12. The other side of the insulating body 11 is provided with a third protrusion 116 symmetrical to the first protrusion 121. During assembly, the first protrusion 121 and the third protrusion 116 are respectively connected to the slots 211 of the opening slot 21. Other structures in this embodiment are the same as in Embodiment 1.

[0066] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite groove wedge, characterized in that, include: Insulating body; One or more pole shoes are provided on one side or opposite sides of the insulating body. The outer sidewall of the pole shoe is fixedly connected to the slot sidewall of the opening slot of the iron core adjacent to it. The inner sidewall of the pole shoe is fixedly connected to the insulating body to cut off the magnetic communication between the inner sidewall of the pole shoe and the opening slot. The insulating body has a groove on one side or opposite sides, and the pole shoe is installed on the groove; the insulating body includes an integrally connected insulating body part, an insulating bottom and an insulating top, the insulating top, the insulating body part and the insulating bottom cooperate with each other to cover the pole shoe.

2. The composite groove wedge according to claim 1, characterized in that, The sidewall where the pole shoe connects with the sidewall of the opening slot is the outer sidewall of the pole shoe, and the sidewall where the pole shoe connects with the sidewall of the groove is the inner sidewall of the pole shoe.

3. The composite groove wedge according to claim 2, characterized in that, The insulating main body is located between the pole shoe and the slot sidewall on the far side of the opening slot, and the insulating bottom is located on the side of the pole shoe near the bottom of the opening slot.

4. The composite groove wedge according to claim 3, characterized in that, The inner wall of the groove formed by the bottom of the insulation is the first groove wall; in the direction from the bottom of the insulation to the main body of the insulation, the first groove wall is inclined away from the bottom of the opening groove.

5. The composite groove wedge according to any one of claims 1-3, characterized in that, The insulating top is located on the other side of the pole shoe, opposite to the bottom of the opening slot.

6. The composite groove wedge according to any one of claims 1-5, characterized in that, The outer side of the pole shoe is provided with an outwardly extending first protrusion, and the side wall of the opening groove is provided with a slot, and the first protrusion engages with the slot; the cross-sectional shape of the first protrusion is the same as the cross-sectional shape of the slot.

7. The composite groove wedge according to claim 6, characterized in that, The insulating body also includes insulating ends that block the two ends along the length of the pole shoe.

8. The composite groove wedge according to claim 7, characterized in that, The insulating end is provided with a second protrusion corresponding to the first protrusion, and the cross-sectional shape of the second protrusion is the same as that of the first protrusion.

9. The composite groove wedge according to any one of claims 1-8, characterized in that, The pole shoe is provided on one side of the insulating body, and the other side of the insulating body facing away from the pole shoe is fixedly connected to the other sidewall of the opening groove.

10. The composite groove wedge according to claim 9, characterized in that, The insulating body has a third protrusion on the side opposite to the pole shoe, and the third protrusion is engaged and fixed with the other side wall of the opening groove.

11. The composite groove wedge according to any one of claims 1-8, characterized in that, The insulating body has pole shoes on both sides of each other, and the insulating body separates the pole shoes located on both sides of the insulating body.

12. An electric motor, comprising an iron core, characterized in that, The iron core is provided with a plurality of open slots, and the open slots are provided in a one-to-one correspondence with the composite slot wedges. The composite slot wedges are composite slot wedges as described in any one of claims 1-11.

13. The motor according to claim 12, characterized in that, The opening slots extend from both the front and rear ends of the insulating body.

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