Permanent magnet motor stator structure of fractional slot concentrated winding

Abstract

The utility model relates to a permanent magnet motor stator structure with fractional slot concentrated windings, which is structurally characterized in that a stator core is formed by mutually connecting a plurality of stator core modules in the radial direction and the axial direction, dovetail concave-convex mechanisms matched in shape are arranged on two sides of each stator core module, and the radially adjacent stator core modules are mutually clamped through the dovetail concave-convex mechanisms. Stator teeth are formed on the inner side of each stator core module, the stator teeth are parallel teeth, and tooth part additional grooves are formed in the outer ends of the stator teeth. The center of each stator core module is provided with an axial through vent hole, the positions of the vent holes of the stator core modules axially located on the same straight line correspond to each other and are communicated with each other, and a cooling pipeline is connected between the vent holes at the outer ends of the adjacent stator core modules in the horizontal direction at the two ends of the stator core. The motor has the advantages that the modular design is adopted, the stator structure is simplified, each stator tooth can be independently wound and then assembled, the winding efficiency can be improved, the production and manufacturing cost can be reduced, and the motor power density and the motor energy efficiency can be effectively improved through the heat dissipation structure.

Description

Technical Field

[0001] This utility model relates to a permanent magnet motor stator structure, specifically a permanent magnet motor stator structure with fractional slot concentrated windings. Background Technology

[0002] In existing technologies, permanent magnet motors generally have integer slot windings, which have the problems of complex winding structure, large amount of copper used at the ends, low efficiency and power density, and cannot effectively meet the needs of some advanced application scenarios that require high efficiency and low torque ripple. Utility Model Content

[0003] This invention proposes a stator structure for a permanent magnet motor with fractional slot concentrated windings. Its purpose is to overcome the above-mentioned shortcomings of the existing technology, simplify the structure, reduce costs, and improve motor energy efficiency and power density.

[0004] The technical solution of this utility model is a stator structure for a permanent magnet motor with fractional slot concentrated winding. The structure includes a stator core and coils. The coils are wound on the stator core, which is composed of several stator core modules arranged radially and axially interconnected. Each stator core module has dovetail-shaped interlocking mechanisms on both sides. Radially adjacent stator core modules are interlocked via these dovetail mechanisms. Each stator core module has stator teeth formed on its inner side; these teeth are parallel teeth, and the outer ends of the teeth have additional slots. The parallel tooth design can relatively increase the slot fill factor and improve motor efficiency. The modular single-tooth core module design reduces winding difficulty and improves production efficiency.

[0005] Preferably, the stator core module has an axially penetrating ventilation hole at its center. The ventilation holes of the stator core modules axially aligned in a straight line are corresponding and interconnected. Cooling pipes connect the ventilation holes at the outer ends of horizontally adjacent stator core modules at both ends of the stator core. All cooling pipes on the stator core are arranged in an axial S-shape. The arrangement of ventilation holes and cooling pipes can improve the motor cooling efficiency and increase the motor power density. The S-shaped arrangement can ensure the uniformity of temperature distribution during the cooling process and improve cooling efficiency.

[0006] Preferably, the gap between the ventilation holes and the cooling pipes is filled with thermally conductive silicone. This can further improve heat dissipation efficiency.

[0007] Preferably, the depth of the additional groove in the tooth is 0.5 mm. This can effectively optimize the cogging torque and reduce motor torque pulsation.

[0008] The advantages of this utility model are: simple and reasonable structural design, modular design, simplified stator structure, each stator tooth can be wound separately and then assembled, which can improve winding efficiency and reduce production cost. It is also preferably equipped with a heat dissipation structure, which can effectively improve motor power density and motor energy efficiency. Attached Figure Description

[0009] Figure 1 This is a partial cross-sectional view of the stator structure of the permanent magnet motor with fractional slot concentrated winding according to this utility model.

[0010] Figure 2 This is a top view schematic diagram of the stator structure of a permanent magnet motor with fractional slot concentrated windings according to this utility model.

[0011] In the diagram, 1 is the stator core, 2 is the coil, 3 is the cooling pipe, 4 is the stator core module, 5 is the dovetail convex-concave mechanism, 6 is the ventilation hole, 7 is the stator tooth, and 8 is the tooth auxiliary groove. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to embodiments and specific implementation methods.

[0013] like Figure 1 , 2 As shown, a stator structure of a permanent magnet motor with fractional slot concentrated winding includes a stator core 1 and coils 2. The coils 2 are wound on the stator core 1. The stator core 1 is composed of several stator core modules 4 arranged radially and axially connected to each other. The stator core modules 4 have axially penetrating ventilation holes 6 in their centers. The ventilation holes 6 of the stator core modules 4 located on a straight line are corresponding and interconnected. Cooling pipes 3 are connected between the ventilation holes 6 at the outer ends of the stator core modules 4 that are horizontally adjacent at both ends of the stator core 1. Thermally conductive silicone is filled in the gap between the ventilation holes 6 and the cooling pipes 3. All the cooling pipes 3 on the stator core 1 are arranged in an axial S-shape. The stator core modules 4 are provided with dovetail convex-concave mechanisms 5 on both sides. Radially adjacent stator core modules 4 are interlocked by the dovetail convex-concave mechanisms 5. Each stator core module 4 has stator teeth 7 formed on its inner side. The stator teeth 7 are parallel teeth. The outer end of the stator teeth 7 is provided with additional tooth grooves 8.

[0014] Based on the above structure, specifically...

[0015] The arrangement of ventilation holes 6 and cooling pipes 3 improves motor cooling efficiency and increases motor power density. The application of thermal grease further enhances heat dissipation efficiency. The overall axially S-shaped arrangement of the cooling pipes 3 ensures uniform temperature distribution during cooling, thereby improving cooling efficiency.

[0016] The dovetail convex-concave mechanism 5 ensures a tight fit and reliable connection between the stator core modules 4.

[0017] The 7-parallel stator tooth design can relatively improve the slot fill factor and enhance motor energy efficiency, while the resulting modular single-tooth core module design can reduce winding difficulty and improve production efficiency.

[0018] The depth of the additional groove 8 in the tooth is preferably 0.5mm, which can effectively optimize the tooth cogging torque and reduce motor torque pulsation.

[0019] The integral stator winding adopts a fractional slot concentrated winding with a span of 1-2, which can effectively reduce the amount of copper used at the winding ends, reduce material consumption and manufacturing costs, and improve motor energy efficiency and reliability.

[0020] All of the components described above are existing technologies, and those skilled in the art can use any model and existing design that can achieve their corresponding functions.

[0021] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A stator structure for a permanent magnet motor with fractional slot concentrated windings, characterized in that, It includes a stator core (1) and a coil (2). The coil (2) is wound on the stator core (1). The stator core (1) is composed of several stator core modules (4) arranged radially and axially connected to each other. The stator core modules (4) are provided with dovetail convex-concave mechanisms (5) with matching shapes on both sides. Radial adjacent stator core modules (4) are interlocked by the dovetail convex-concave mechanisms (5). Each stator core module (4) has stator teeth (7) formed on its inner side. The stator teeth (7) are parallel teeth. The outer end of the stator teeth (7) is provided with tooth additional grooves (8).

2. The stator structure of a permanent magnet motor with fractional slot concentrated windings as described in claim 1, characterized in that, The stator core module (4) has an axially penetrating ventilation hole (6) in the center. The ventilation holes (6) of the stator core module (4) located on a straight line are corresponding and connected. Cooling pipes (3) are connected between the ventilation holes (6) at the outer ends of the stator core modules (4) that are horizontally adjacent at both ends of the stator core (1). All cooling pipes (3) on the stator core (1) are arranged in an axial S-shape.

3. The stator structure of a permanent magnet motor with fractional slot concentrated windings as described in claim 2, characterized in that, The gap between the ventilation hole (6) and the cooling pipe (3) is filled with thermally conductive silicone.

4. The stator structure of a permanent magnet motor with fractional slot concentrated windings as described in claim 1, characterized in that, The toothed additional groove (8) has a depth of 0.5 mm.

Images