Motor stator with tooth crown separation structure and motor

Abstract

The utility model provides a kind of motor stator and motor of tooth crown separation structure, wherein motor stator includes yoke part, tooth part and crown part, the number of tooth part is set to multiple, multiple the tooth part is equidistantly arranged on yoke part along yoke part circumference, the crown part includes multiple tooth crown, multiple the tooth crown is sequentially connected into circular structure, multiple the tooth crown is as corresponding with multiple tooth part, the tooth part is detachably connected with corresponding tooth crown.The utility model crown part is regular circle structure and detachably connected with tooth part, it is favorable to reduce the torque ripple of motor, reduce vibration noise, and increase slot fill factor, improve the power density and slot fill factor of motor, can reduce motor volume and save material.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and in particular relates to a motor stator and motor with a tooth crown separation structure. Background Technology

[0002] Currently, most hybrid motorcycles use external rotor permanent magnet synchronous motors for their power generation systems. The rotor mainly consists of two parts: the rotor housing and the magnets. The magnets are divided into two types of arc-shaped thin sheets, N-pole and S-pole, which are glued one by one to the inner diameter of the rotor housing. The stator core consists of a tooth section and a yoke section, with slots formed between adjacent teeth; the top of the teeth has a crown, and slots are naturally formed between adjacent crowns.

[0003] There are two main stator structure design schemes: one is a complete stator core structure, where coils are wound directly onto the teeth of the stator core to form the stator. For example, a 12-tooth stator core requires 12 coils. To facilitate the entry of the winding head or tooling into the slot for winding, a gap must be left between the coils. Otherwise, once the coil on one tooth is wound, the adjacent tooth cannot be wound. This gap reduces the motor's slot fill factor, increases resistance, and decreases power density and efficiency. Furthermore, to facilitate winding, the slot opening must also have a certain width; a wider slot opening will result in larger torque pulsations and higher vibration and noise in the motor.

[0004] Another type of stator core is the modular structure, which separates the teeth and yoke of the stator core. For example, a 12-tooth stator core can be divided into 12 tooth blocks and 1 yoke block. Each tooth block has a protrusion at its bottom, and the yoke block has a corresponding groove. Winding is done on individual tooth blocks. After the coil is wound, the 12 tooth blocks with coils are combined with the groove of the yoke block to form a complete stator. Although the modular stator structure has a high slot fill factor and a small slot width, the large number of tooth blocks with varying dimensional tolerances leads to irregular deformation after being combined with the yoke groove. This results in poor roundness of the stator outer diameter and poor central symmetry of the teeth, often leading to three-phase inductance imbalance and high low-order vibration noise. Utility Model Content

[0005] The purpose of this utility model is to provide a motor stator and motor with a tooth crown separation structure. The crown is a round structure and is detachably connected to the tooth, which helps to reduce the torque pulsation of the motor, reduce vibration and noise, and increase the slot fill factor, thereby improving the power density and slot fill factor of the motor, and reducing the size of the motor and saving materials.

[0006] This utility model is achieved through the following technical solution:

[0007] A motor stator with a toothed crown separation structure includes a yoke, teeth, and a crown. The number of teeth is set to multiple, and the multiple teeth are evenly spaced along the circumference of the yoke. The crown includes multiple crowns, and the multiple crowns are connected in sequence to form a circular structure. The multiple crowns correspond to the multiple teeth, and the teeth are detachably connected to the corresponding crowns.

[0008] Furthermore, adjacent crowns are connected by a connecting piece.

[0009] Furthermore, the thickness of the connecting piece is less than the thickness of the tooth crown.

[0010] Furthermore, the connecting piece and the crown are integrated into one structure.

[0011] Furthermore, a protrusion is provided on the end of the tooth away from the yoke, and a groove is provided on the tooth crown to engage with the protrusion.

[0012] This utility model also provides an electric motor, including the motor stator with the above-mentioned tooth crown separation structure.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: the tooth crown is connected as a whole to form a closed slot structure stator, which reduces the magnetic reluctance change caused by the magnetic field passing through the slot, which helps to reduce the torque pulsation of the motor and reduce vibration noise. In addition, the crown is a perfect circle structure, which ensures the roundness of the stator's outer diameter and the central symmetry of the tooth, thereby reducing the low-order vibration noise of the motor. The tooth crown and the tooth are detachably connected, which allows the coil to be wound externally and then inserted into the tooth. This not only facilitates winding, but also requires only a small gap between adjacent coils to avoid contact, increases the slot fill factor, improves the power density and slot fill factor of the motor, and can reduce the size of the motor and save materials. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the motor stator with the tooth crown separation structure of this utility model;

[0015] Figure 2 This is a schematic diagram showing the connection between the yoke and the teeth in the motor stator of the tooth crown separation structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the crown portion of the motor stator with the tooth crown separation structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the motor stator after the coil is wound around the tooth crown separation structure of this utility model.

[0018] In the diagram, 1-yoke, 2-tooth, 21-protrusion, 3-crown, 31-tooth crown, 32-connecting piece, 33-groove, 4-coil. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and 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 this utility model.

[0024] Please see Figures 1 to 4 , Figure 1This is a schematic diagram of the motor stator with the tooth crown separation structure of this utility model. Figure 2 This is a schematic diagram showing the connection between the yoke and the teeth in the motor stator of the tooth crown separation structure of this utility model. Figure 3 This is a schematic diagram of the crown portion of the motor stator in the tooth crown separation structure of this utility model. Figure 4 This is a schematic diagram of the motor stator with a toothed crown separation structure after the coil is wound. A motor stator with a toothed crown separation structure includes a yoke, teeth, and a crown. The number of teeth is set to multiple, and the multiple teeth are evenly spaced along the circumference of the yoke. The crown includes multiple tooth crowns, which are sequentially connected to form a circular structure. The multiple tooth crowns correspond to multiple teeth, and the teeth are detachably connected to their corresponding tooth crowns.

[0025] This invention relates to a motor stator with a tooth crown separation structure. The tooth crowns are integrated into a single unit, forming a closed-slot stator structure. This reduces the magnetic reluctance change caused by the magnetic field passing through the slot, which helps to reduce motor torque pulsation. Specifically, torque pulsation is reduced by 1% to 2%, reducing vibration and noise. Furthermore, the crown is a perfectly circular structure with a roundness of 0.04, ensuring both the outer diameter roundness of the stator and the central symmetry of the teeth. The tooth distribution angle tolerance can reach ±0.1°, thus avoiding low-order vibration and noise caused by poor structural symmetry. In one embodiment, adjacent tooth crowns are connected by a connecting piece. The connecting piece and the tooth crown are an integral structure, facilitating the manufacturing and production of the crown. In one embodiment, the thickness of the connecting piece is less than the thickness of the tooth crown. The connecting piece is designed to be relatively narrow, which reduces the magnetic field forming a loop between adjacent teeth through the connecting piece, reducing magnetic leakage.

[0026] The tooth crown and tooth portion are detachably connected, allowing the coil to be wound externally before being fitted into the tooth portion. This not only facilitates winding but also requires only a small gap between adjacent coils to avoid contact, increasing slot fill factor and improving the motor's power density and slot fill factor, thus reducing motor size and saving materials. Specifically, compared to existing in-slot winding processes, the slot fill factor is increased by approximately 5% to 10%, and the motor core length can be shortened by 5% to 10% for the same power. In one embodiment, a protrusion is provided on the end of the tooth portion away from the yoke, and a groove is provided on the tooth crown to engage with the protrusion. During installation, the protrusion on the tooth portion is inserted into the corresponding groove of the tooth crown, achieving a detachable connection between the tooth portions. Furthermore, the protrusion on the tooth portion and the groove of the tooth crown are interchangeable.

[0027] This utility model also provides an electric motor, including the motor stator with the aforementioned toothed crown separation structure. This motor, including the aforementioned motor stator with the toothed crown separation structure, has all the effects of the aforementioned motor stator with the toothed crown separation structure, which will not be elaborated further here.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A motor stator of a crown split structure, characterized by, It includes a yoke, teeth, and a crown. The number of teeth is set to multiple, and the multiple teeth are evenly spaced on the yoke along the circumference. The crown includes multiple crowns, and the multiple crowns are connected in sequence to form a circular structure. The multiple crowns correspond to the multiple teeth, and the teeth and the corresponding crowns are detachably connected.

2. The stator of a toothed crown split structure electric machine according to claim 1, characterized in that, The two adjacent crowns are connected by a connecting piece.

3. The stator of a toothed crown split structure electric machine according to claim 2, characterized in that, The thickness of the connecting piece is less than the thickness of the tooth crown.

4. The stator of a toothed crown split structure electric machine according to claim 3, characterized in that, The connecting piece and the crown are an integral structure.

5. The stator of a toothed crown split structure electric machine according to claim 1, characterized in that, The tooth has a protrusion at the end away from the yoke, and the tooth crown has a groove that engages with the protrusion.

6. An electric machine characterized by The motor stator includes the tooth crown separation structure as described in any one of claims 1-5.

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