An asymmetric slot type outer rotor permanent magnet motor stator core

Abstract

The utility model relates to motor stator core technical field especially an asymmetric slot type's outer rotor permanent magnet motor stator core, solved the stator core body long -term operation easy to appear tooth deformation, yoke part cracking, and traditional reinforcement structure is single outer -pasted type beam, leads to the insufficient rigidity of core whole, under the high -speed operating condition easy to produce vibration displacement, and further influence motor operation precision and service life problem. An asymmetric slot type's outer rotor permanent magnet motor stator core, including the core assembly, the reinforcement assembly includes the reinforcement cylinder, the reinforcement cylinder outside surface fixed connection in the stator core body inner wall. Through the stereoscopic structure design of reinforcement assembly, the reinforcement cylinder is adhered to the stator core body inner wall and forms radial support, cooperates both sides circular hollow reinforcement piece and carries out the location to the core axial both ends, effectively dispersed the concentrated load of electromagnetic radial force to the core tooth part, yoke part, avoids local deformation.

Description

Technical Field

[0001] This utility model relates to the field of motor stator core technology, and in particular to an asymmetric slotted external rotor permanent magnet motor stator core. Background Technology

[0002] The stator core of an asymmetric slotted external rotor permanent magnet motor is a key component constituting the motor's magnetic circuit and supporting windings. It is constructed from laminated silicon steel sheets in a ring-shaped structure. In this structure, the slots extend from the inner diameter side to the outer diameter side, forming a closed yoke between the slot bottom and the outer diameter of the core, serving as an important channel for the magnetic circuit. The number of slots is evenly distributed along the circumference, and the asymmetric characteristics of adjacent slots maintain a regularity. This optimizes the air gap magnetic field distribution through the asymmetry of the slot shape and ensures the stability of motor operation through the ring-shaped symmetry of the overall structure.

[0003] Current technology reduces cogging torque through asymmetric slot design, thereby optimizing the air gap magnetic flux density waveform.

[0004] While existing asymmetric slotted stator cores for external rotor permanent magnet motors reduce cogging torque and optimize air gap magnetic flux density waveforms through their asymmetric slot design, they face numerous prominent problems in practical applications. In terms of operation, the stator core itself relies solely on the strength of its stacked silicon steel sheets to bear electromagnetic radial forces and torque pulsations, making it prone to tooth deformation and yoke cracking over long-term operation. Furthermore, traditional reinforcement structures are mostly single external stiffeners, failing to provide three-dimensional support, resulting in insufficient overall core rigidity. This leads to vibration and displacement under high-speed conditions, affecting motor operating accuracy and service life. Therefore, to address these shortcomings of existing technologies, we urgently need an innovative asymmetric slotted stator core for external rotor permanent magnet motors to solve these problems. Utility Model Content

[0005] The purpose of this invention is to provide an asymmetric slotted external rotor permanent magnet motor stator core, which solves the problem that the stator core body relies solely on the strength of its own silicon steel sheet stacking to bear electromagnetic radial force and torque pulsation, which is prone to tooth deformation and yoke cracking during long-term operation; and that traditional reinforcement structures are mostly single external stiffeners, which cannot form three-dimensional support, resulting in insufficient overall rigidity of the core, which is prone to vibration and displacement under high speed conditions, thus affecting the motor's operating accuracy and service life.

[0006] To achieve the above objectives, this utility model provides an asymmetric slotted external rotor permanent magnet motor stator core, including a core assembly. The core assembly includes a stator core body, and a reinforcing component is provided on the outside of the stator core body. The reinforcing component includes a reinforcing cylinder, and the outer surface of the reinforcing cylinder is fixedly connected to the inner wall of the stator core body.

[0007] The outer surface of the reinforcing cylinder is fixedly connected with two circular hollow reinforcing plates, which are positioned correspondingly.

[0008] The inner wall of the circular hollow reinforcing sheet is fixedly connected with an annular reinforcing ring, and there are two annular reinforcing rings in corresponding positions.

[0009] Both annular reinforcing rings have short reinforcing bars fixedly connected to their side surfaces, and the number of short reinforcing bars is several and they are evenly distributed on the side surfaces of the two annular reinforcing rings.

[0010] The two circular hollow reinforcing plates and the two annular reinforcing rings are all fixedly connected by metal reinforcing bolts. There are six metal reinforcing bolts, which are evenly distributed between the two circular hollow reinforcing plates and the two annular reinforcing rings.

[0011] Among them, the two annular reinforcing rings are fixedly connected to the two sides of the stator core body on one side, and the short reinforcing bars on both sides are fixedly connected to the two sides of the stator core body on one side.

[0012] The stator core body has irregular grooves on its side surface, and the number of irregular grooves is evenly distributed on the side surface of the stator core body.

[0013] 1. In this utility model, through the three-dimensional structural design of the reinforcing component, the reinforcing cylinder fits into the inner wall of the stator core body to form radial support, and the two circular hollow reinforcing plates on both sides limit the axial ends of the core, effectively dispersing the concentrated load of the electromagnetic radial force on the core teeth and yoke, and avoiding local deformation.

[0014] 2. In this utility model, through the cooperation of the annular reinforcing ring, the short rod reinforcing rib and the metal reinforcing bolt, the short rod reinforcing rib directly connects the annular reinforcing ring and the stator core body, while the metal reinforcing bolt strengthens the connection strength between the circular hollow reinforcing plate and the annular reinforcing ring, forming a rigid frame with multi-node support, thereby reducing the vibration amplitude at high speeds. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the right side view of an embodiment of the present invention.

[0018] Figure 3 This is a side view structural diagram of an embodiment of the present utility model.

[0019] Figure 4 This is a partial structural schematic diagram of an embodiment of the present utility model.

[0020] Figure 5 This is an embodiment of the present utility model. Figure 4 Enlarged schematic diagram of the structure at point A in the diagram.

[0021] In the figure: 1. Core assembly; 101. Stator core body; 102. Irregular groove; 2. Reinforcing assembly; 201. Reinforcing cylinder; 202. Circular hollow reinforcing plate; 203. Annular reinforcing ring; 204. Short rod reinforcing rib; 205. Metal reinforcing bolt. Detailed Implementation

[0022] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0023] The first embodiment of this application is as follows: Please see Figure 1 - Figure 5A stator core for an asymmetric slotted external rotor permanent magnet motor includes a core assembly 1, which includes a stator core body 101. A reinforcing assembly 2 is provided on the outer side of the stator core body 101. The reinforcing assembly 2 includes a reinforcing cylinder 201, the outer surface of which is fixedly connected to the inner wall of the stator core body 101. Two circular hollow reinforcing plates 202 are fixedly connected to the outer surface of the reinforcing cylinder 201, and their positions correspond to each other. Two annular reinforcing rings 203 are fixedly connected to the inner wall of the circular hollow reinforcing plates 202, and their positions correspond to each other. Short reinforcing ribs 204 are fixedly connected to the side surfaces of both annular reinforcing rings 203, and their numbers are evenly distributed on the side surfaces of the two annular reinforcing rings 203. Metal reinforcing bolts 205 are fixedly connected between each of the two circular hollow reinforcing plates 202 and the two annular reinforcing rings 203. There are six metal reinforcing bolts 205, evenly distributed between the two circular hollow reinforcing plates 202 and the two annular reinforcing rings 203. The corresponding surface of each of the two annular reinforcing rings 203 is fixedly connected to both sides of the stator core body 101. Similarly, the corresponding surface of each of the short reinforcing ribs 204 on both sides is fixedly connected to both sides of the stator core body 101. The stator core body 101 of the core assembly 1 is made of high-silicon electrical steel sheets. This material has excellent magnetic permeability and low iron loss characteristics, which can reduce hysteresis loss and eddy current loss during motor operation, ensuring the efficient magnetic conduction performance of the stator core body 101 as the core channel of the motor magnetic circuit. The reinforcing cylinder 201, the circular hollow reinforcing plate 202, and the annular reinforcing ring 203 of the reinforcing assembly 2 are all made of low-carbon steel. Low-carbon steel has high strength and toughness, which can provide stable support for the stator core body 101 and prevent the stator core body 101 from deforming during motor operation vibration. The short rod reinforcing rib 204 is made of alloy structural steel. The high strength characteristics of alloy structural steel can... The connection stability between the reinforcing component 2 and the stator core body 101 is further enhanced, and the external force on the stator core body 101 is dispersed. The metal reinforcing bolt 205 is made of stainless steel, which has excellent corrosion resistance and fatigue resistance. It can prevent the metal reinforcing bolt 205 from loosening due to rust or fatigue damage during long-term use, and ensure the continuous reinforcement effect of the reinforcing component 2 on the stator core body 101. At the same time, the two annular reinforcing rings 203 and the short rod reinforcing ribs 204 on both sides are fixedly connected to the two sides of the stator core body 101. Through the synergistic effect of the material properties of each reinforcing component, the overall structural strength and magnetic performance of the stator core are guaranteed.

[0024] Please see Figure 1 - Figure 5Based on the first embodiment, an irregular groove 102 is provided on the side surface of the stator core body 101. The number of irregular grooves 102 is several and they are evenly distributed on the side surface of the stator core body 101. The stator core body 101 has several uniformly distributed irregular slots 102 on its side surface. The slot walls are made of the same high-silicon electrical steel sheet material as the stator core body 101. The high permeability of this material ensures the continuity of the magnetic circuit in the area surrounding the irregular slots 102, avoiding an increase in local magnetic reluctance due to the slots. At the same time, considering that the irregular slots 102 may reduce the local structural strength of the stator core body 101, the high-silicon electrical steel sheet is locally quenched in the transition area at the edge of the irregular slots 102 to improve the hardness and strength of the material in this area. This prevents cracking or deformation at the edge of the irregular slots 102 when the stator core body 101 is fitted with windings or subjected to operating stress. This ensures the stable fitting function of the irregular slots 102 for the windings and maintains the overall structural reliability and magnetic conductivity of the stator core body 101.

[0025] Working principle: First, the stator core body 101 in the core assembly 1 is made of high-silicon electrical steel sheets laminated together. Utilizing the high permeability and low iron loss of the high-silicon electrical steel sheets, the stator core body 101, as the core of the motor's magnetic circuit, can efficiently conduct the magnetic field, reducing hysteresis and eddy current losses, thus providing a foundation for stable motor magnetic performance. In the reinforcement assembly 2 configured on its outer side, the reinforcement cylinder 201, the circular hollow reinforcement plate 202, and the annular reinforcement ring 203 are made of low-carbon steel, relying on low... The high strength and high toughness of carbon steel are utilized to form a ring-shaped support structure for the stator core body 101. This structure is achieved by fixing the reinforcing cylinder 201 to the inner wall of the stator core body 101 and the annular reinforcing ring 203 to both sides of the stator core body 101, preventing deformation of the stator core body 101 during motor operation vibration. Simultaneously, the short reinforcing ribs 204 are made of alloy structural steel, which, with its higher mechanical strength, further strengthens the connection between the annular reinforcing ring 203 and the stator core body 101. The connection stability of the stator core body 101 is improved, and the external forces on the stator core body 101 are dispersed. The metal reinforcing bolt 205 is made of stainless steel. By utilizing the corrosion resistance and fatigue resistance of stainless steel, a stable connection between the circular hollow reinforcing plate 202 and the annular reinforcing ring 203 is achieved. This avoids the loosening of the reinforcing component 2 due to rust or fatigue during long-term use, and ensures the continuous reinforcement effect of the reinforcing component 2 on the stator core body 101. Based on the first embodiment, several irregularly distributed slots 102 are opened on the side surface of the stator core body 101. The slot walls are made of high-silicon electrical steel to maintain the continuity of the magnetic circuit. The transition area at the edge of the slot is locally quenched to improve the hardness and strength of the material. This ensures that the irregular slots 102 can stably accommodate the windings and avoids the reduction of the local structural strength of the stator core body 101 caused by the opening of the slots. Finally, through the synergistic effect of the material properties of each component, the overall magnetic performance, structural stability and functional reliability of the stator core are unified.

[0026] 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 process, method, article, or apparatus.

[0027] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. An asymmetric slotted external rotor permanent magnet motor stator core, comprising a core assembly (1), characterized in that, The core assembly (1) includes a stator core body (101), and a reinforcing component (2) is provided on the outside of the stator core body (101). The reinforcing component (2) includes a reinforcing cylinder (201), and the outer surface of the reinforcing cylinder (201) is fixedly connected to the inner wall of the stator core body (101).

2. The asymmetric slotted external rotor permanent magnet motor stator core according to claim 1, characterized in that, The outer surface of the reinforcing cylinder (201) is fixedly connected with two circular hollow reinforcing plates (202) in corresponding positions.

3. The asymmetric slotted external rotor permanent magnet motor stator core according to claim 2, characterized in that, The inner wall of the circular hollow reinforcing plate (202) is fixedly connected with an annular reinforcing ring (203), and there are two annular reinforcing rings (203) in corresponding positions.

4. The asymmetric slotted external rotor permanent magnet motor stator core according to claim 3, characterized in that, Both annular reinforcing rings (203) have short reinforcing bars (204) fixedly connected to their side surfaces. The number of short reinforcing bars (204) is several and they are evenly distributed on the side surfaces of the two annular reinforcing rings (203).

5. The asymmetric slotted external rotor permanent magnet motor stator core according to claim 2, characterized in that, Metal reinforcing bolts (205) are fixedly connected between the two circular hollow reinforcing plates (202) and the two annular reinforcing rings (203). There are six metal reinforcing bolts (205) and they are evenly distributed between the two circular hollow reinforcing plates (202) and the two annular reinforcing rings (203).

6. The asymmetric slotted external rotor permanent magnet motor stator core according to claim 3, characterized in that, The two annular reinforcing rings (203) are fixedly connected to the two sides of the stator core body (101) on one side, and the two short reinforcing bars (204) are fixedly connected to the two sides of the stator core body (101) on one side.

7. The asymmetric slotted external rotor permanent magnet motor stator core according to claim 1, characterized in that, The stator core body (101) has irregular grooves (102) on its side surface. The number of irregular grooves (102) is several and they are evenly distributed on the side surface of the stator core body (101).

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