Stator structure for motor and motor

Abstract

The utility model relates to the field of motors, in particular to a stator structure for a motor, and the stator structure comprises a stator main body (1) which is provided with a first contact pin (11), a second contact pin (12) and a positioning part (13), and the positioning part is separated from the first contact pin and the second contact pin; the circuit board (2) is provided with a first through hole (21), a second through hole (22) and a positioning coupling part (23), the first through hole is suitable for being fixedly connected with the first contact pin, the second through hole is suitable for being fixedly connected with the second contact pin, so that the stator main body (1) is electrically connected with the circuit board (2), and the positioning part (13) and the positioning coupling part (23) are configured to be detachably connected at least in a mutual assembly state. Constraint limiting displacement of the circuit board (2) relative to the stator main body (1) is generated at least in the extension surface of the circuit board (2). According to the embodiment of the invention, the circuit board and the electronic components thereof can be accurately connected to the stator main body.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, in particular to a stator structure for an electric machine and a corresponding electric machine. BACKGROUND

[0002] At present, various electric machines are widely used in the field of household appliances, such as driving motors, fan motors, water pump motors, etc. Among them, single-phase brushless DC motors have the advantages of simple installation structure, small size, high efficiency, low price, etc. When designing the control system of the electric machine, the circuit board needs to be electrically connected with the stator body. However, the existing scheme has the problem that the positioning of the circuit board relative to the stator is not accurate, resulting in damage to the control efficiency of the electric machine. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application proposes an improved stator structure for an electric machine in order to solve at least one technical problem existing in the prior art or other technical problems not mentioned.

[0004] According to a first aspect of the present application, a stator structure for an electric machine is provided, comprising: a stator body having a first pin, a second pin, and a positioning portion spaced apart from the first pin and the second pin; and a circuit board having a first through hole, a second through hole, and a positioning coupling portion, the first through hole being adapted to be fixedly connected with the first pin, and the second through hole being adapted to be fixedly connected with the second pin to realize electrical connection between the stator body and the circuit board, wherein the positioning portion and the positioning coupling portion are configured to be detachably connected at least in the state of being assembled with each other, thereby at least generating a constraint within the extension surface of the circuit board to limit the displacement of the circuit board relative to the stator body.

[0005] According to an optional embodiment of the present application, the stator body has only one positioning portion, and the circuit board has only one corresponding positioning coupling portion.

[0006] According to an optional embodiment of the present application, the positioning portion and the positioning coupling portion are coupled with each other in a zero-clearance or interference manner.

[0007] According to an optional embodiment of the present application, the positioning portion is arranged adjacent to the first pin, and the positioning coupling portion is arranged adjacent to the first through hole.

[0008] According to an optional embodiment of the present application, the first through hole and the second through hole are arranged on the same circumferential line of the circuit board, and the positioning coupling portion is arranged on or immediately adjacent to the same circumferential line.

[0009] According to an optional embodiment of the present application, the positioning coupling portion is arranged between the first through hole and the second through hole.

[0010] According to an optional embodiment of the present application, the positioning portion is a positioning post extending from the stator body towards the circuit board.

[0011] According to an optional embodiment of the present application, the positioning coupling portion is a through hole penetrating the base of the circuit board.

[0012] According to an optional embodiment of the present application, the positioning portion extends parallel to the first pin and the second pin.

[0013] According to an optional embodiment of the present application, the positioning portion has a longitudinal length and / or an inner diameter smaller than the first pin and the second pin.

[0014] According to an optional embodiment of the present application, the positioning portion does not extend beyond the base of the circuit board.

[0015] According to an optional embodiment of the present application, the stator body comprises at least two insulation frames, one of the at least two insulation frames has the first pin, another of the at least two insulation frames has the second pin, and the positioning portion is arranged in the same insulation frame as the first pin.

[0016] According to an optional embodiment of the present application, the first pin is arranged at a middle position of an end face of the corresponding insulation frame, and the positioning portion is arranged at an edge position of the end face of the corresponding insulation frame.

[0017] According to an optional embodiment of the present application, the positioning portion is integrally formed with the corresponding insulation frame.

[0018] According to an optional embodiment of the present application, the insulation frame having the positioning portion has a width greater than that of other insulation frames of the stator body.

[0019] According to an optional embodiment of the present application, the insulation frame having the first pin and the insulation frame having the second pin are adjacent.

[0020] According to an optional embodiment of the present application, the first through hole and the second through hole are respectively arranged at two opposite circumferential edges of the circuit board.

[0021] According to an optional embodiment of the present application, the stator body has N insulation frames, and the circuit board has a substantially N-th ring, N being an even number greater than 1.

[0022] According to a second aspect of the present application, a motor is provided, the motor comprising any of the stator structures according to the present application.

[0023] According to an optional embodiment of the present application, the motor is a single-phase brushless DC motor.

[0024] Through the embodiments of the present application, the precise positioning of the circuit board and its electronic components relative to the stator body can be realized, so that the single-phase motor control parameters are controlled in advance, thereby improving the efficiency of the motor control system and reducing the vibration of the motor operation.

[0025] It should be noted that the advantages and beneficial effects of the present application are not limited to the above-mentioned advantages and beneficial effects, and those skilled in the art can understand other unmentioned advantages and beneficial effects of the present application through the following specific embodiments and claims. BRIEF DESCRIPTION OF DRAWINGS

[0026] The principles, features and advantages of the present application can be better understood by referring to the following detailed description of the present application in conjunction with the accompanying drawings. In the drawings:

[0027] Figure 1 A stator structure with a circuit board in the prior art is shown;

[0028] Figure 2 A front view of a stator structure according to one exemplary embodiment of the present application is shown, in which the positioning part and the positioning coupling part are in an assembled state with each other;

[0029] Figure 3 A top view of the stator structure shown in Figure 2 is shown;

[0030] Figure 4 A perspective view of the stator structure shown in Figure 2 is shown; and

[0031] Figure 5 A perspective view of the stator body of the stator structure shown in Figure 2 is shown.

[0032] LIST OF REFERENCE NUMBERS

[0033] 1 stator body

[0034] 11 first pin

[0035] 12 second pin

[0036] 13 positioning part

[0037] 14 insulating framework

[0038] 15 insulating framework

[0039] 16 stator enameled wire

[0040] 17 stator enameled wire

[0041] 2 circuit board

[0042] 21 first through hole

[0043] 22 second through hole

[0044] 23 positioning coupling portion

[0045] 24 base body

[0046] 25 electronic component, sensor

[0047] 1' stator body of existing stator structure

[0048] 2' circuit board of existing stator structure

[0049] 3' PIN of existing stator structure DETAILED DESCRIPTION

[0050] In order to make the technical problems to be solved, technical solutions and beneficial technical effects of the present application more clear, the present application will be further described in detail below in combination with the drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the principles of the present application, but not to limit the protection scope of the present application. In the drawings of the present application, the features with the same structure or function are denoted by the same reference numerals.

[0051] Figure 1 A stator structure with a circuit board in the prior art is shown. As shown in Figure 1 In the prior art, the circuit board 2' is usually designed as a complete ring, and the stator body 1' has three PINs 3', which are respectively welded to the circuit board 2', wherein two of the PINs 3' are input and output pins of the stator body, and the third PIN 3' serves to support and fix the circuit board. The motor driver can control the commutation of the motor stator, so that the functional components (such as a fan) can operate normally.

[0052] However, in such prior art, since the circuit board needs to be welded to the three PINs 3' of the stator body, i.e. so-called "three-point welding", the area / size of the circuit board is usually relatively large. In addition, the mating holes of the circuit board and the PINs of the stator body are clearance fit, which makes the circuit board and the electronic components (such as integrated chips with built-in Hall sensors) for motor electric control on the circuit board prone to positioning inaccuracies relative to the stator body, which can cause poor commutation consistency of the drive chip, thereby reducing the control efficiency of the motor and increasing the rotation vibration of the motor. Therefore, it is necessary to propose an improved scheme to improve the positioning accuracy when the circuit board is connected to the stator body.

[0053] Figures 2 to 5 A stator structure according to an exemplary embodiment of the present application is shown from different viewing angles, respectively. As shown in Figure 2As shown, the stator structure according to the embodiment of the present application comprises a stator body 1 and a circuit board 2. The stator body 1 comprises a plurality of core laminations stacked with each other. As shown in Figure 2 and Figure 5 As shown, the stator body 1 has a first pin 11, a second pin 12 and a positioning portion 13. As shown in Figure 2 and Figure 3 As shown, the circuit board 2 has a first through hole 21, a second through hole 22 and a positioning coupling portion 23, the first through hole 21 is adapted to be fixedly connected with the first pin 11, the second through hole 22 is adapted to be fixedly connected with the second pin 12, so as to realize the electrical connection between the stator body 1 and the circuit board 2. The circuit board 2 comprises a base body 24 and an electronic element 25 arranged on the base body 24. The electronic element 25 is, for example, an integrated chip, such as an integrated chip with a built-in Hall sensor. In addition, Figure 4 Only one electronic element 25 is shown in the figure, in fact, the circuit board 2 can also have a plurality of electronic elements 25 or other components.

[0054] Specifically, as shown in Figure 5 The stator enameled wires 16 and 17 are wound on the first pin 11 and the second pin 12 respectively, then the first pin 11 and the second pin 12 with the stator enameled wires wound thereon are inserted into the first through hole 21 and the second through hole 22 of the circuit board 2 respectively, and are fixedly connected by welding (such as tin dipping welding). In this way, the electrical connection between the stator body 1 and the circuit board 2 can be realized through the first pin 11 and the second pin 12 and the corresponding stator enameled wires.

[0055] In particular, the positioning portion 13 and the positioning coupling portion 23 can be configured to be detachably connected at least in the assembled state with each other, so as to at least generate a constraint within the extension plane of the circuit board 2 to limit the displacement of the circuit board 2 relative to the stator body 1. Through the cooperation of the positioning portion 13 and the positioning coupling portion 23, the displacement of the circuit board 2 relative to the stator body 1 can be avoided, so as to avoid the positioning deviation caused thereby and improve the positioning accuracy of the circuit board 2 relative to the stator body 1. At the same time, the positioning portion 13 and the positioning coupling portion 23 are detachably connected in the assembled state with each other, which changes the connection mode of the stator body 1 and the circuit board 2 from the "three-point welding" in the prior art to "two-point welding".

[0056] The positioning portion 13 is spaced apart from the first pin 11 and the second pin 12. That is, the positioning portion 13 can be located at a different position from the first pin 11 and the second pin 12 with respect to the circumferential direction of the stator body 1. Since the first pin 11 and the second pin 12 are also spaced apart from each other, the differently positioned positioning portion 13, the first pin 11 and the second pin 12 can constitute a "triangular" arrangement, and the positioning coupling portion 23, the first through hole 21 and the second through hole 22 of the circuit board 2 form a "triangular" arrangement in the extension plane of the circuit board 2. Compared with a "linear" arrangement, such a "triangular" arrangement in the extension plane of the circuit board 2 helps to achieve stable connection of the stator body 1 and the circuit board 2. Here, the so-called "triangular" arrangement can mean that the corresponding three components or elements can be connected two by two to form a triangle. In addition, the three components or elements in the same "triangular" arrangement can be constrained with respect to each other, especially in the extension plane of the circuit board 2, thereby helping to improve the positioning accuracy of the circuit board 2 with respect to the stator body 1.

[0057] Preferably, the stator body 1 can have only one positioning portion 13, and the circuit board 2 has only one corresponding positioning coupling portion 23. In this way, a simple structure and simple connection can be achieved. Preferably, the positioning portion 13 and the positioning coupling portion 23 can be coupled to each other in a zero gap or interference manner. That is, when the positioning portion 13 is coupled to the positioning coupling portion 23, the circuit board 2 can be positioned in place with respect to the stator body 1.

[0058] Preferably, the positioning portion 13 can be arranged adjacent to the first pin 11, and the positioning coupling portion 23 can be arranged adjacent to the first through hole 21. Here and in the following, the first pin 11 can be one of the input pins and the output pins of the stator, and in particular refers to the pin adjacent to the positioning portion 13; the second pin 12 can be the other of the input pins and the output pins of the stator. Additionally or alternatively, the first through hole 21 and the second through hole 22 can be arranged on the same circumferential line of the circuit board 2 (as shown by the dashed line in Figure 3 Additionally or alternatively, the positioning coupling portion 23 can be arranged between the first through hole 21 and the second through hole 22. Since the positions of the first through hole 21 and the second through hole 22 are fixed with respect to each other, arranging the positioning coupling portion 23 between the two through holes can save the size of the circuit board 2 in the circumferential direction. These optional features can individually or in combination help to reduce the size of the circuit board 2 and save space.

[0059] The positioning part 13 can be a positioning post extending from the stator body 1 toward the circuit board 2. Alternatively or additionally, the positioning coupling part 23 can be a through hole penetrating the base 24 of the circuit board 2. Thus, the connection between the positioning part 13 and the positioning coupling part 23 can be achieved with a simple structure.

[0060] Preferably, the positioning part 13 can extend parallel to the first pin 11 and the second pin 12. This facilitates the assembly of the circuit board 2 with the stator body 1, particularly by translating it relative to the stator body 1. For example, during assembly, the positioning part 13, the first pin 11 with the stator enameled wire 16, and the second pin 12 with the stator enameled wire 2 can be simultaneously and correspondingly inserted into the positioning coupling part 23, the first through hole 21, and the second through hole 22, respectively. Then, the circuit board 2 is fixed within its extending surface by the cooperation of the positioning part 13 and the positioning coupling part 23. In some possible embodiments, since there is a fit allowance (i.e., clearance fit) between the first pin 11 and the first through hole 21, and between the second pin 12 and the second through hole 22, the circuit board 2 can rotate to a certain extent relative to the stator body 1 around the cooperating positioning part 13 and the positioning coupling part 23. That is, the pre-assembly of the stator body 1 and the circuit board 2 is thus achieved. Then, for example, by soldering, the first pin 11 and the first through hole 21 are soldered together, and the second pin 12 and the second through hole 22 are soldered together, thereby completing the assembly of the stator body 1 and the circuit board 2 and realizing the corresponding electrical connection.

[0061] Preferably, the positioning portion 13 may have a longitudinal length smaller than that of the first pin 11 and the second pin 12. More preferably, the positioning portion 13 may not extend beyond the base 24 of the circuit board 2. Figure 2 As shown, the first pin 11 and the second pin 12 extend beyond the lower surface of the base 24, ensuring a sufficient and secure connection between the corresponding pins and the through holes. The positioning part 13 does not extend beyond the lower surface of the base 24, which helps save space below the base 24 or avoids positional interference with other motor components. Alternatively or additionally, the positioning part 13 may have an inner diameter smaller than that of the first pin 11 and the second pin 12. A relatively small positioning part 13 can help further improve positioning accuracy. Furthermore, when the positioning part 13 and the positioning coupling part 23 are engaged, the first pin 11 and the second pin 12 may have a fit allowance with the first through hole 21 and the second through hole 22, respectively. This facilitates the engagement of the positioning part 13 and the positioning coupling part 23, and also facilitates subsequent welding between the first pin 11 and the first through hole 21, and between the second pin 12 and the second through hole 22.

[0062] In some embodiments, the stator body 1 can comprise at least two insulation frames 14, 15, one of the at least two insulation frames 14 having the first pins 11, the other of the at least two insulation frames 15 having the second pins 12, the positioning portion 13 being arranged in the same insulation frame 14 as the first pins 11. In this way, the adjacent arrangement of the positioning portion 13 and the first pins 11 can be conveniently realized.

[0063] In order to fix the first pins 11, the end face of the respective insulation frame 14 can be provided with a receiving hole at the middle position thereof to allow the first pins 11 to be inserted therein. In particular, the first pins 11 can be over-matched with the receiving hole of the insulation frame 14, and the first pins 11 can be pressed into the receiving hole to realize a fixed connection. The second pins 12 and the respective insulation frame 15 also have the same design.

[0064] Further, the first pins 11 can be arranged at the middle position of the end face of the respective insulation frame 14, and the positioning portion 13 can be arranged at the edge position of the end face of the respective insulation frame 14. Preferably, the positioning portion 13 is integrally formed with the respective insulation frame 14. Since the positioning portion 13 and the insulation frame 14 do not need to be connected by assembly, the positioning accuracy of the circuit board 2 relative to the stator body 1 can be realized by the positioning portion 13, thereby ensuring the position consistency of the electronic elements 25 on the circuit board 2, improving the control efficiency of the electric control system, and reducing the running vibration of the motor. In one embodiment, the positioning portion 13 can be a further extended positioning column formed at the end face of the respective insulation frame 14.

[0065] Due to the arrangement of the positioning portion 13, the width (in particular, the width in the circumferential direction) of the insulation frame 14 with the positioning portion 13 can be greater than the width of other insulation frames of the stator body 1, thereby facilitating both the structural design and the identification and circuit board assembly.

[0066] In particular, the first through hole 21 and the second through hole 22 are arranged at two opposite circumferential edges of the circuit board 2, respectively. In this way, the positions of the first through hole 21 and the second through hole 22 substantially determine the minimum circumferential size of the circuit board 2. Additionally or alternatively, the insulation frame 14 with the first pins 11 and the insulation frame 15 with the second pins 12 are adjacent. This arrangement can allow the size of the circuit board 2 to be reduced.

[0067] In Figure 1In the prior art shown, due to the full circular shape of the circuit board 2, the three PINs must be arranged away from each other, especially arranged on the three insulating skeletons respectively. Taking the stator structure with four insulating skeletons as an example, in the circumferential direction of the circuit board, the included angle between two PINs is about 90°. Only in this way, sufficient support force can be provided for the circuit board. However, in the embodiments of the present application, the shape and size of the circuit board 2 can be designed according to the range of the first pin 11 and the second pin 12.

[0068] Further preferably, the stator body 1 can have N insulating skeletons, and the circuit board 2 has a substantially Nth ring shape, N being an even number greater than 1. In Figures 2 to 5 In the example shown, N = 4. Thus, the circuit board 2 can be implemented as a "crescent" structure, which can save the space occupied by the circuit board 2 compared with the full circular ring structure in the prior art. In other embodiments of the present application, N can also be equal to 2 or greater than 4.

[0069] The embodiments of the present application also provide an electric machine comprising the stator structure according to any one of the present application. In particular, the electric machine according to the embodiments of the present application can be a single-phase brushless DC motor.

[0070] It is worth noting that in some embodiments, the assembly can also be injection molded after the stator body 1 and the circuit board 2 are assembled, so as to embed the stator body 1 and the circuit board 2 inside the stator housing. Such a stator structure and the corresponding electric machine are also within the scope of the present application.

[0071] According to the embodiments of the present application, by means of "two welding points and one positioning point", the precise positioning of the circuit board and its electronic components relative to the stator body is provided, so that the single-phase motor control parameters are controlled in advance, thereby improving the efficiency of the motor control system and reducing the vibration of the motor operation.

[0072] It should be understood that, in the present document, the expressions "first", "second", etc. are only used for descriptive purposes and should not be understood as indicating or implying relative importance, nor should they be understood as implicitly indicating the number of the technical features indicated. The features defined with "first", "second" can explicitly or implicitly indicate that at least one such feature is included.

[0073] In addition, in the description of the specification, descriptions of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. mean that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the present application. Exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the particular feature, structure, material, or characteristic being described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described in the specification can be combined or recombined in and / or among different embodiments or examples, without being mutually exclusive, by those skilled in the art.

Claims

1. A stator structure for an electric machine, characterized by The stator structure comprises: a stator body (1) having a first pin (11), a second pin (12) and a positioning portion (13) spaced apart from the first pin (11) and the second pin (12); and a circuit board (2) having a first through hole (21) adapted to be fixedly connected with the first pin (11), a second through hole (22) adapted to be fixedly connected with the second pin (12) to realize electrical connection between the stator body (1) and the circuit board (2), and a positioning coupling portion (23), wherein the positioning portion (13) and the positioning coupling portion (23) are configured to be detachably connected at least in an assembled state with each other, thereby at least within an extension plane of the circuit board (2) generating a constraint limiting displacement of the circuit board (2) relative to the stator body (1).

2. The stator structure for an electric machine according to claim 1, characterized in that the stator body (1) has only one positioning portion (13) and the circuit board (2) has only one corresponding positioning coupling portion (23); and / or the positioning portion (13) and the positioning coupling portion (23) are coupled to each other in a zero-clearance or interference manner.

3. The stator structure for an electric machine according to claim 2, characterized in that the positioning portion (13) is arranged adjacent to the first pin (11) and the positioning coupling portion (23) is arranged adjacent to the first through hole (21); and / or the first through hole (21) and the second through hole (22) are arranged on a same circumferential line of the circuit board (2) and the positioning coupling portion (23) is provided on or immediately adjacent to the same circumferential line; and / or the positioning coupling portion (23) is arranged between the first through hole (21) and the second through hole (22).

4. The stator structure for an electric machine according to any one of claims 1-3, characterized in that the positioning portion (13) is a positioning post extending from the stator body (1) towards the circuit board (2); and / or the positioning coupling portion (23) is a through hole penetrating a base body (24) of the circuit board (2).

5. The stator structure for an electric machine according to claim 4, characterized in that the positioning portion (13) extends in parallel with the first pin (11) and the second pin (12); and / or the positioning portion (13) has a longitudinal length and / or an inner diameter smaller than those of the first pin (11) and the second pin (12); and / or the positioning portion (13) does not extend beyond the base body (24) of the circuit board (2).

6. The stator structure for an electric machine according to any one of claims 1-3, 5, characterized in that the stator body (1) comprises at least two insulating frames (14, 15), one of the at least two insulating frames (14) has the first pin (11) and the other of the at least two insulating frames (15) has the second pin (12), and the positioning portion (13) is arranged in the same insulating frame (14) as the first pin (11).

7. The stator structure for an electric machine according to claim 6, characterized in that The first pin (11) is arranged at a middle position of an end surface of the corresponding insulating frame (14), and the positioning portion (13) is arranged at an edge position of the end surface of the corresponding insulating frame (14); and / or The positioning portion (13) is integrally formed with the corresponding insulating frame (14); and / or The width of the insulating frame (14) with the positioning portion (13) is greater than the width of other insulating frames of the stator body (1); and / or The insulating frame (14) with the first pin (11) and the insulating frame (15) with the second pin (12) are adjacent; and / or The first through hole (21) and the second through hole (22) are respectively arranged at two opposite circumferential edges of the circuit board (2).

8. The stator structure for an electric machine according to claim 6, characterized in that, The stator body (1) has N insulating frames, and the circuit board (2) has a substantially Nth part of a ring shape, N being an even number greater than 1.

9. An electric machine characterized by The electric machine comprises the stator structure according to any one of claims 1-8.

10. The electric machine according to claim 9, characterized in that, The electric machine is a single-phase brushless direct current electric machine.

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