Stator frame and electric machine

Abstract

The present disclosure provides a stator core, each of the common terminal core segments includes a yoke portion, the yoke portion includes a terminal end having an end face, and a common terminal is disposed on the end face. The windings of different phases are connected to the common terminals on each common terminal core segment by transition wires, so that the common terminals are short-circuited, and the transition wires pass above the end faces of all the common terminal core segments. At least a portion of the at least two common terminal core segments includes a wire guard post disposed on the end face thereof, the wire guard post prevents the transition wires from being displaced radially outward. The present disclosure also provides an electric machine. The wire guard post on the common terminal core segment can protect the transition wires connected between the common terminals, and prevent the transition enameled wires from being extruded in the direction of the outer diameter of the stator (the housing) or being broken off during the stator injection molding stage, thereby improving product yield.

Description

Technical Field

[0001] This disclosure provides a stator frame and also provides an electric motor. Background Technology

[0002] Motor stators are typically manufactured through automated winding of enameled wire onto a stator frame, followed by injection molding. To improve winding efficiency and avoid the inefficiency of multi-stage winding, a single enameled wire is usually used to continuously wind the U, V, and W phases. To wind all three phases in one go, all phase enameled wires must pass through a common terminal. However, due to the limited size of the common terminal, a single common terminal cannot accommodate all the passing enameled wires; therefore, two or more common terminals are needed to distribute the amount of enameled wire passing through.

[0003] Normally, a stator winding should have only one common terminal, meaning that the U-phase, V-phase, and W-phase share one common terminal. If multiple common terminals are required due to objective reasons, transition enameled wire should be used to connect these common terminals together, short-circuiting them to form a common node with the same potential, thus forming a single common terminal.

[0004] The transition enameled wire used to connect multiple common terminals is typically suspended relative to the stator bobbin around which the windings are wound. When the winding process is complete and the injection molding stage begins, the injection molding compound is injected into the mold under pressure. For example... Figure 6 and Figure 7 As shown, because the transition enameled wire is suspended and lacks support, under the action of injection molding pressure, the transition enameled wire may be pushed by the injection molding material towards the stator outer diameter (outer shell) (e.g. Figure 7 (As shown by the dashed circle in the image), it can even be squeezed and broken. Such squeezing or breakage can cause short circuits or open circuits in the windings, seriously affecting the electrical performance and reliability of the motor. More seriously, such problems are often only detected later in the production line, leading to a decrease in production yield, increased production costs, and wasted resources. Utility Model Content

[0005] In response to the problems and needs mentioned above, this disclosure proposes a novel technical solution that solves the aforementioned problems and brings about other technical effects by adopting the following technical features.

[0006] This disclosure provides a stator frame, comprising: a plurality of frame blocks, including at least two common terminal frame blocks, wherein each of the at least two common terminal frame blocks includes a yoke, the yoke including a terminal end having an end face, and a common terminal being disposed on the end face; wherein windings of different phases are connected to the common terminal on each common terminal frame block by a transition line to short-circuit the common terminals, and the transition line passes over the end faces of all common terminal frame blocks, wherein at least a portion of the at least two common terminal frame blocks includes a guard post disposed on its end face, the guard post preventing the transition line from radially outward displacement.

[0007] Preferably, the wire guard post is located at the corner of the end face of the corresponding common terminal frame block, and the corner is located radially outward relative to the common terminal on the corresponding common terminal frame block.

[0008] Preferably, the guard post has a height H1 in the axial direction relative to the end face, and the transition line has a maximum height H2 in the axial direction relative to the end face, and H1 ≥ H2.

[0009] Preferably, the corresponding common terminal frame block further includes a terminal socket disposed on its end face for receiving the corresponding common terminal. The terminal socket has a partition plate located radially inside the transition line. The partition plate has a maximum height H3 in the axial direction relative to the end face, and H1 / H3 = 0.8~1.2.

[0010] Preferably, the end face of the terminal end of each common terminal frame block includes positioning blocks disposed at two corners of the end face, the two corners being located radially outward relative to the common terminal on the end face, and the wire guard post being disposed on one or both of the positioning blocks.

[0011] Preferably, the guard post and the corresponding positioning block are formed separately and then connected together.

[0012] Preferably, the wire guard post, the corresponding positioning block, and the common terminal frame where they are located are integrally formed.

[0013] Preferably, the portion of the guard post that contacts the transition line is formed as a plane or an arc surface.

[0014] Preferably, the plurality of skeleton blocks include three common terminal skeleton blocks.

[0015] Preferably, the common terminals on all common terminal frame blocks are electrically connected together by a single transition line; or the common terminals on all common terminal frame blocks are electrically connected by multiple transition lines, with each transition line short-circuited to the others.

[0016] This disclosure also provides an electric motor including a stator comprising the stator frame described above.

[0017] Through this disclosure, all common terminals together constitute a total common terminal, and the wire guard posts on the common terminal frame blocks can protect the transition wires connected between the common terminals so that they are not suspended, thereby protecting the transition enameled wires from being squeezed into the direction of the stator outer diameter (shell) or broken during the stator injection molding stage, thus improving product yield. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a stator frame in an in-line configuration according to a preferred embodiment of the present disclosure;

[0019] Figure 2 This is a schematic diagram showing the segmentation of the common terminal frame in a stator frame according to a preferred embodiment of the present disclosure;

[0020] Figure 3 This is a top view of the stator after it has been rolled up according to a preferred embodiment of the present disclosure;

[0021] Figure 4 A front view of a common terminal frame block in a stator frame according to a preferred embodiment of the present disclosure;

[0022] Figure 5 This is a schematic diagram of the common terminal frame segmentation in the stator frame according to another preferred embodiment of the present disclosure;

[0023] Figure 6 and Figure 7 These are schematic diagrams and top views of the common terminal frame blocks in the stator frame of the prior art. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0025] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0026] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by those skilled in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Where the number of components is not specified, the number of components may be one or more; similarly, terms such as “a,” “the,” and “described” do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “install,” “set,” “connect,” or “link” are not limited to physical or mechanical installation, setting, or connection, but may include electrical installation, setting, or connection, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate the relative positional relationship of the equipment during use or as shown in the accompanying drawings; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] Preferred embodiments according to this disclosure will now be described with reference to the accompanying drawings. It should be understood that the radial, axial, and circumferential directions of each frame segment are aligned with the radial, axial, and circumferential directions of the motor rotor. Although Figure 1 The stator frame is shown in a generally straight state, but after being rolled up, it has circumferential and radial directions. Figure 3 (This shows the state after stator rolling), and then the axial direction X and radial direction R of the skeleton blocks are shown in... Figure 2-3 As shown, the circumferential direction (unmarked) is consistent with the circumferential direction of the arc surface of the skeleton block.

[0028] See Figure 1 and Figure 2 The preferred embodiment of this disclosure provides a stator frame including multiple frame blocks, and Figure 1 The image shows three common terminal block 1 of the stator frame. Figure 2 A magnified view shows a schematic diagram of the yoke portion of the three common terminal frame blocks 1.

[0029] Furthermore, each common terminal frame block 1 includes a yoke, which includes a terminal end having an end face 11, and a common terminal 3 is disposed on the end face 11. Windings of different phases (e.g., U, V, W phases) are connected to the common terminal 3 on each common terminal frame block 1 via transition lines 2 (also called transition enameled wires) to short-circuit each common terminal 3, and the transition lines 2 pass over the end faces 11 of all common terminal frame blocks 1. Two of the three common terminal frame blocks 1 (i.e.,...) Figure 2 The left and middle common terminal frame blocks also include a wire guard post 13 disposed on its end face 11, which can prevent the transition line 2 from radially displaced outward.

[0030] It should be understood that, Figure 2 The common terminal frame block 1 on the right side is the frame block where the last common terminal 3 connected to the transition line 2 is located. Therefore, it is not necessary to set the wire protection post 13 on the common terminal frame block 1. That is to say, not every common terminal frame block 1 needs to be set with a wire protection post 13. Only the wire protection post 13 needs to be set on the common terminal frame block 1 that needs to block and protect the transition line 2 as needed.

[0031] In addition, the number of common terminal frame blocks 1 can vary depending on the different motor structures and actual needs, but usually the number of common terminal frame blocks 1 is at least two.

[0032] Through this disclosure, three common terminals together constitute a total common terminal, and the wire guard posts on the common terminal frame can protect the transition wires connected between the common terminals so that they are not suspended, thereby protecting the transition enameled wires from being squeezed into the direction of the stator outer diameter (shell) or broken during the stator injection molding stage, thus improving product yield.

[0033] Preferably, the common terminals 3 on all common terminal frame blocks 1 are electrically connected together by a transition line 2; or the common terminals 3 on all common terminal frame blocks 1 are electrically connected by multiple transition lines 2, and each transition line 2 is short-circuited to the others.

[0034] See further Figure 2 and Figure 3 The guard post 13 can be installed at the corner of the end face 11 of the corresponding common terminal frame block 1, which is located radially outward relative to the common terminal 3 on the corresponding common terminal frame block 1. This corner is essentially the radially outermost position of the end face 11, located between two adjacent common terminal frame blocks, and is usually the position where the transition line 2 is most easily compressed. Therefore, this position is usually the most suitable for installing the guard post 13, thereby providing sufficient blocking and protection for the transition line 2.

[0035] Preferably, see Figure 4 The guard post 13 has an axial height H1 relative to the end face 11, and the transition line 2 has a maximum axial height H2 relative to the end face 11, where H1 ≥ H2. Therefore, the guard post 13 can provide sufficient blocking and protection for the transition line 2 in the axial direction.

[0036] More preferably, the corresponding common terminal frame block 1 further includes a terminal socket 4 disposed on its end face 11 for receiving the corresponding common terminal 3. The terminal socket 4 itself may also have a wire-blocking post 42 for retaining the transition line 2. Furthermore, the terminal socket 4 also has a wire-blocking plate 41 located radially inside the transition line 2, the wire-blocking plate 41 having a maximum axial height H3 relative to the end face 11, and H1 / H3=0.8~1.2. Since the terminal socket 4 and its wire-blocking plate 41 can have different forms according to the structural and performance requirements of different stator frames, by setting the height of the wire-blocking post 13 according to the above proportional relationship, the need to provide sufficient protection for the transition line 2 can be basically met.

[0037] It should be understood that the stator frame of this invention is suitable for automatic winding operations. During automatic winding, an automatic winding fixture (not shown) is typically used to fix the stator frame to accommodate the automatic winding operation. Therefore, as... Figure 5 As shown, according to a preferred embodiment of the present invention, the end face 11 of each common terminal frame block 1 includes positioning blocks 14 disposed at two corners of the end face 11, and these two corners are located radially outward relative to the common terminal 3 on the end face 11, so as to be suitable for engagement with an automatic winding fixture. Furthermore, a wire guard post 13 is disposed on one or both of the positioning blocks 14. Figure 2-3 and Figure 4-5 In the preferred embodiment shown, a wire guard post is provided at the right corner of the end face 11 of the corresponding common terminal frame block 1, while the left corner may not have a wire guard post.

[0038] In other words, the guard post 13 and the corresponding positioning block 14 are formed separately and connected together (e.g. Figure 4-5 As shown), they can be connected together by any suitable method, such as bonding, welding, snap-fit ​​connection, or bolt connection. Therefore, without modifying the existing stator frame design and molds, only the wire guard posts need to be installed on the positioning blocks of the common terminal frame sections in the existing stator frame.

[0039] Alternatively, the wire guard post 13, the corresponding positioning clip 14, and the common terminal frame block 1 where they are located can be integrally formed (e.g., Figure 2-3 As shown in the figure, it can be integrally formed during the injection molding process of the stator frame itself. The strength of the wire guard post can be increased by integrally molding the wire guard post and the common terminal frame separately.

[0040] Preferably, such as Figure 3As shown, the part of the guard post 13 that contacts the transition line 2 can be formed as a plane or as an arc (not shown), so that the part of the guard post 13 that contacts the transition line 2 will not form sharp corners or edges, thus avoiding damage to the paint of the transition line 2 caused by the transition line 2 being pressed onto the guard post 13 during the stator injection molding stage.

[0041] This disclosure also provides an electric motor including a stator comprising a stator frame as described above.

[0042] The exemplary embodiments of this disclosure have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A stator frame, characterized in that, include: Multiple skeleton blocks, including at least two common terminal skeleton blocks (1), wherein each of the at least two common terminal skeleton blocks (1) includes a yoke, the yoke including a terminal end having an end face (11), and a common terminal (3) is disposed on the end face (11); In this process, windings of different phases are connected to common terminals (3) on each common terminal frame block (1) via transition lines (2) to short-circuit each common terminal (3), and the transition lines (2) pass over the end faces (11) of all common terminal frame blocks (1). At least a portion of the at least two common terminal frame blocks (1) includes a wire guard post (13) disposed on its end face (11), the wire guard post (13) preventing the transition line (2) from radially displacing outward.

2. The stator frame as described in claim 1, characterized in that, The guard post (13) is located at the corner of the end face (11) of the corresponding common terminal frame block (1), and the corner is located radially outward relative to the common terminal (3) on the corresponding common terminal frame block (1).

3. The stator frame as described in claim 2, characterized in that, The guard post (13) has a height H1 in the axial direction relative to the end face (11), and the transition line (2) has a maximum height H2 in the axial direction relative to the end face (11), and H1 ≥ H2.

4. The stator frame as described in claim 3, characterized in that, The corresponding common terminal frame block (1) further includes a terminal socket (4) disposed on its end face (11) for receiving the corresponding common terminal (3), the terminal socket (4) having a partition plate (41) located radially inside the transition line (2), the partition plate (41) having a maximum height H3 in the axial direction relative to the end face (11), and H1 / H3=0.8~1.

2.

5. The stator frame as described in claim 1, characterized in that, Each common terminal frame block (1) has a terminal end face (11) including two positioning blocks (14) at two corners of the end face (11), the two corners being located radially outward relative to the common terminal (3) on the end face (11), and the wire guard post (13) being disposed on one or both of the positioning blocks (14).

6. The stator frame as described in claim 5, characterized in that, The guard post (13) and the corresponding positioning block (14) are formed separately and connected together.

7. The stator frame as described in claim 5, characterized in that, The wire guard post (13), the corresponding positioning block (14), and the common terminal frame block (1) where they are located are integrally formed.

8. The stator frame as described in any one of claims 1-7, characterized in that, The portion of the guard post (13) that contacts the transition line (2) is formed as a plane or an arc.

9. The stator frame as described in any one of claims 1-7, characterized in that, The plurality of skeleton blocks include three common terminal skeleton blocks (1).

10. The stator frame as described in any one of claims 1-7, characterized in that, All common terminals (3) on all common terminal frame blocks (1) are electrically connected together by a transition line (2); or all common terminals (3) on all common terminal frame blocks (1) are electrically connected by multiple transition lines (2), and each transition line (2) is short-circuited to the other.

11. An electric motor, characterized in that, It includes a stator, which includes a stator frame as described in any one of claims 1-10.

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