Three-armature motor

Abstract

The present invention provides a three-armature motor, including a stator assembly and a rotor assembly, wherein the stator assembly includes an outer stator core and an inner stator core, the rotor assembly includes a rotating shaft and a magnetic ring, the magnetic ring includes an inner magnetic ring and an outer magnetic ring connected as one body, and the magnetic ring is set in a magnetic conductive shell, a first armature is formed between the outer circumferential side of the outer stator core and the outer magnetic ring, the inner magnetic ring is in a gap formed between the outer stator core and the inner stator core, a second armature is formed between the inner circumferential side of the outer stator core and the inner magnetic ring, and a third armature is formed between the outer circumferential side of the inner stator core and the inner magnetic ring. According to the present invention, the outer stator core and the inner stator core utilize both the inner and outer annular surfaces of the inner magnetic ring, increasing the utilization area of ​​the permanent magnetic material, thereby improving the efficiency and power density of the motor, and at the same time, since the inner magnetic ring and the outer magnetic ring are connected as one body, the three armatures simultaneously provide magnetic field force for the rotor, greatly improving the torque output of the motor.

Description

Technical Field

[0001] The invention belongs to the technical field of motor vehicle manufacturing, and in particular relates to a three-armature motor. Background Art

[0002] At present, permanent magnet motors are generally composed of a stator and a rotor, that is, single armature drive. For surface-mounted magnetic tiles or magnetic ring rotors, only the outer cylindrical surface of the permanent magnet material is used by the stator, and the utilization area of ​​the permanent magnet material is low, which limits the efficiency and power density of the motor. Moreover, single armature drive motors are difficult to meet the requirements of low-speed high torque and high-speed operation capabilities at the same time. In order to achieve high torque output, it is usually necessary to increase the size of the motor to increase the electromagnetic force, which increases the cost and increases the motor's demand for installation space. Summary of the invention

[0003] Therefore, the present invention provides a three-armature motor, which can overcome the contradiction between the motor output torque and the motor volume in the related art, that is, the motor with larger output torque has larger volume, and the motor with smaller volume has smaller output torque.

[0004] In order to solve the above problems, the present invention provides a three-armature motor, including a stator assembly and a rotor assembly, wherein the stator assembly includes an outer stator core and an inner stator core, the rotor assembly includes a rotating shaft and a magnetic ring, the magnetic ring includes an inner magnetic ring and an outer magnetic ring connected as one body and the magnetic ring is sleeved in a magnetic conductive shell, a first armature is formed between the outer circumferential side of the outer stator core and the outer magnetic ring, the inner magnetic ring is in a gap formed between the outer stator core and the inner stator core, a second armature is formed between the inner circumferential side of the outer stator core and the inner magnetic ring, and a third armature is formed between the outer circumferential side of the inner stator core and the inner magnetic ring.

[0005] In some embodiments, the magnetic conductive shell and the magnetic ring are interference fit, and the magnetic conductive shell and the rotating shaft are interference fit.

[0006] In some embodiments, the magnetic shell and the rotating shaft are interference-fitted through a through hole, the axial length of the interference fit between the hole wall of the through hole and the rotating shaft is L, the diameter of the rotating shaft and the through hole at the interference fit position is D, and L≥D / 2.

[0007] In some embodiments, a connecting ring is provided between the inner magnetic ring and the outer magnetic ring, and a mating connection between the connecting ring and the magnetic conductive shell has a concave-convex connection structure.

[0008] In some embodiments, the connecting ring is provided with a first guide hole, and the matching connection between the magnetic conductive shell and the connecting ring is also provided with a second guide hole, and the positions of the first guide hole and the second guide hole are adapted to each other.

[0009] In some embodiments, the tooth length of the first stator teeth on the outer circumferential side of the outer stator core is shorter than the tooth length of the second stator teeth on the inner circumferential wall of the outer stator core; and / or the tooth length of the third stator teeth on the outer circumferential wall of the inner stator core is longer than the tooth length of the second stator teeth on the inner circumferential wall of the outer stator core.

[0010] In some embodiments, the outer stator core is overmolded with an outer frame, and the inner stator core is overmolded with an inner frame. The material of the outer frame and the inner frame is one of nylon PA66, PBT or PET.

[0011] In some embodiments, the two axial end surfaces of the outer stator core wrapped with the outer skeleton and the two axial end surfaces of the inner stator core wrapped with the inner skeleton are connected as a whole through injection molding.

[0012] In some embodiments, the material of the injection molded part is bulk molding compound.

[0013] In some embodiments, an axial end surface of the outer stator core has a first area, which is an area not covered by the injection molded part, and an axial end surface of the inner stator core has a second area, which is an area not covered by the injection molded part, and the first area and the second area are on the same side of the stator assembly.

[0014] The present invention provides a three-armature motor, in which the outer stator core and the inner stator core utilize both the inner and outer ring surfaces of the inner magnetic ring, thereby increasing the utilization area of ​​the permanent magnetic material, thereby improving the efficiency and power density of the motor. At the same time, since the inner magnetic ring and the outer magnetic ring are connected as one, the three armatures simultaneously provide magnetic field force for the rotor, greatly improving the torque output of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the external structure of a three-armature motor according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 Schematic diagram of the internal structure;

[0017] Figure 3 for Figure 1 Schematic diagram of the assembly of the magnetic shell, magnetic ring, outer stator core and inner stator core (axial projection);

[0018] Figure 4 for Figure 1 Schematic diagram of the structural breakdown of the three-armature motor;

[0019] Figure 5 for Figure 1Schematic diagram of structural breakdown of the stator assembly;

[0020] Figure 6 for Figure 1 Schematic diagram of the structural decomposition of the magnetic ring and the magnetic shell;

[0021] Figure 7 for Figure 1 Schematic diagram of the assembly of the magnetic ring and the magnetic shell.

[0022] The reference numerals are:

[0023] 1. Magnetic shell; 1a. Groove; 2. Magnetic ring; 2a. Inner magnetic ring; 2b. Outer magnetic ring; 2c. First guide hole; 2d. Protrusion; 3. Stator assembly; 3a. Outer stator core; 3b. Inner stator core; 3c. Injection molded part; 4. Rotating shaft; 5. Bearing; 6. Outer frame; 7. Inner frame; 8. Wire passing structure. DETAILED DESCRIPTION

[0024] See also Figures 1 to 7 As shown, according to an embodiment of the present invention, a three-armature motor is provided, including a stator assembly 3 and a rotor assembly, wherein the stator assembly 3 includes an outer stator core 3a and an inner stator core 3b, the rotor assembly includes a rotating shaft 4 and a magnetic ring 2, the magnetic ring 2 includes an inner magnetic ring 2a and an outer magnetic ring 2b connected as one body, and the magnetic ring 2 is sleeved in a magnetic conductive shell 1, a first armature is formed between the outer circumferential side of the outer stator core 3a and the outer magnetic ring 2b, the inner magnetic ring 2a is in a gap formed between the outer stator core 3a and the inner stator core 3b, a second armature is formed between the inner circumferential side of the outer stator core 3a and the inner magnetic ring 2a, and a third armature is formed between the outer circumferential side of the inner stator core 3b and the inner magnetic ring 2a. In this technical solution, the outer stator core 3b and the inner stator core 3a utilize both the inner and outer ring surfaces of the inner magnetic ring 2a, increasing the utilization area of ​​the permanent magnetic material, thereby improving the efficiency and power density of the motor. At the same time, since the inner magnetic ring 2a and the outer magnetic ring 2b are connected as a whole, the three armatures simultaneously provide magnetic field force for the rotor, greatly improving the torque output of the motor.

[0025] The magnetic shell 1 is, for example, an iron shell. In some embodiments, the outer peripheral side of the outer magnetic ring 2b is interference-fitted with a magnetic shell 1 (an iron shell in a specific embodiment), and the magnetic shell 1 and the magnetic ring 2 are interference-fitted, and the magnetic shell 1 and the rotating shaft 4 are interference-fitted. In this way, the magnetic shell 1 can serve as a magnetic circuit conducting medium for the magnetic ring 2, especially the outer magnetic ring 2b, and can also serve as an output connection component for the motor rotation drive. Furthermore, the magnetic shell 1 and the rotating shaft 4 are interference-fitted through a through hole, and the axial length of the hole wall of the through hole and the rotating shaft 4 is L, and the diameter of the rotating shaft 4 and the through hole interference fit position is D, L ≥ D / 2, so as to ensure the bonding force between the magnetic shell 1 and the rotating shaft 4.

[0026] In some embodiments, there is a connecting ring between the inner magnetic ring 2a and the outer magnetic ring 2b, and the matching connection between the connecting ring and the magnetic shell 1 has a concave-convex connection structure, which can further increase the tangential bonding force between the magnetic ring 2 and the magnetic shell 1, and effectively prevent the thermal expansion of the two when the motor is heated up, resulting in a reduction in the interference, so that the magnetic ring 2 will produce idling. The concave-convex connection structure can be specifically a protrusion 2d provided on the connecting ring and a groove 1a provided on the magnetic shell 1. In a preferred embodiment, the inner magnetic ring 2a, the outer magnetic ring 2b and the connecting ring connected therebetween are formed by the same material through a mold.

[0027] In order to facilitate the smooth alignment of the concave-convex connection structure between the magnetic ring 2 and the magnetic shell 1, in some embodiments, the connecting ring is provided with a first guide hole 2c, and the matching connection between the magnetic shell 1 and the connecting ring is also provided with a second guide hole (not shown in the figure), and the positions of the first guide hole 2c and the second guide hole are adapted to each other. Specifically, when the magnetic ring 2 and the magnetic shell 1 are assembled, a pin is inserted into the first guide hole 2c and the second guide hole to form a positioning guide for the positions of the two.

[0028] In some embodiments, the tooth length of the first stator tooth on the outer circumferential side of the outer stator core 3a is shorter than the tooth length of the second stator tooth on the inner circumferential wall of the outer stator core 3a; and / or the tooth length of the third stator tooth on the outer circumferential wall of the inner stator core 3b is longer than the tooth length of the second stator tooth on the inner circumferential wall of the outer stator core 3a, which is beneficial to ensure that each stator tooth has a larger slot area.

[0029] In some embodiments, the outer stator core 3a is coated with an outer frame 6, and the inner stator core 3b is coated with an inner frame 7. The material of the outer frame 6 and the inner frame 7 is one of nylon PA66, PBT or PET. Furthermore, 10%-30% glass fiber can be appropriately added to enhance the strength of the frame. The outer frame 6 and the inner frame 7 mainly surround the core teeth, and the winding coil (not shown in the figure) is wound on the tooth frame. The frame isolates the core from the coil to play an insulating role and prevent the coil from leaking or scratching. The yoke frame is provided with a wire passing structure 8, which plays a role in guiding and fixing the wire, facilitating the winding of the coil and preventing the wire from being loose and messy.

[0030] In some embodiments, the two axial ends of the outer stator core 3a wrapped with the outer skeleton 6 and the two axial ends of the inner stator core 3b wrapped with the inner skeleton 7 are connected as a whole through the injection molding 3c. The outer stator core 3a and the inner stator core 3b are connected as a whole through the injection molding 3c, which can simplify the assembly process of the motor. It can be understood that the corresponding bearing chamber can also be formed on the injection molding 3c by injection molding, and then the corresponding bearing 5 is arranged in the bearing chamber to realize the connection between the rotating shaft 4 and the stator assembly. The material of the injection molding 3c is bulk molding compound (BMC), which is light, cheap, high in strength, has excellent electrical properties, mechanical properties, heat resistance, chemical corrosion resistance, flame retardancy, and can adapt to various molding processes, and the product quality is stable. It should be noted that the injection molding 3c in the technical solution is only at the axial end of the stator core, and it does not cover the teeth of the stator core, which can enhance the heat dissipation capacity of the stator.

[0031] An axial end face of the outer stator core 3a has a first region, which is an area not covered by the injection molded part 3c. An axial end face of the inner stator core 3b has a second region, which is an area not covered by the injection molded part 3c. The first region and the second region are located on the same side of the stator assembly. The outer stator core 3a and the inner stator core 3b to be connected as one by injection molding can be positioned in the axial direction by reserving the first region and the second region. The first region and the second region are, for example, respectively an exposed circular ring surface on the inner cylindrical shaft end of the outer stator core 3a and an exposed circular ring surface on the outer cylindrical shaft end of the inner stator core 3b. The ring width of the exposed circular ring surface is not less than 0.5 mm.

[0032] The assembly process of the motor is as follows: ① stacking the inner stator core 3b and the outer stator core 3a; ② injection molding the skeleton of the inner stator core 3b and the outer stator core 3a (that is, the aforementioned inner skeleton 7 and outer skeleton 6); ③ winding; ④ positioning the inner stator core 3b and the outer stator core 3a and then injection molding the injection molded part 3c; ⑤ pressing the magnetic ring 2 into the magnetic shell 1; ⑥ pressing the bearing at the shaft end into the rotating shaft 4; ⑦ passing the rotating shaft 4 through the stator assembly, and placing the bearing at the shaft end in the bearing chamber; ⑧ pressing another bearing into the rotating shaft 4 and placing it in the corresponding bearing chamber; ⑨ pressing the magnetic shell 1 into the rotating shaft 4.

[0033] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A three-armature motor, characterized in that: The invention comprises a stator assembly (3) and a rotor assembly, wherein the stator assembly (3) comprises an outer stator core (3a) and an inner stator core (3b), and the rotor assembly comprises a rotating shaft (4) and a magnetic ring (2), wherein the magnetic ring (2) comprises an inner magnetic ring (2a) and an outer magnetic ring (2b) which are connected as one body, and the magnetic ring (2) is sleeved in a magnetic conductive shell (1), a first armature is formed between the outer circumferential side of the outer stator core (3a) and the outer magnetic ring (2b), the inner magnetic ring (2a) is located in a gap formed between the outer stator core (3a) and the inner stator core (3b), and the inner magnetic ring (2a) of the outer stator core (3a) is provided with a first armature. A second armature is formed between the circumferential side and the inner magnetic ring (2a), and a third armature is formed between the outer circumferential side of the inner stator core (3b) and the inner magnetic ring (2a); the magnetic shell (1) and the rotating shaft (4) are interference-fitted through a through hole, a connecting ring is provided between the inner magnetic ring (2a) and the outer magnetic ring (2b), and a concave-convex connection structure is provided at a matching connection between the connecting ring and the magnetic shell (1); a first guide hole (2c) is configured on the connecting ring, and a second guide hole is configured at a matching connection between the magnetic shell (1) and the connecting ring, and the positions of the first guide hole (2c) and the second guide hole are adapted to each other.

2. The three-armature motor according to claim 1, characterized in that: The magnetic shell (1) and the magnetic ring (2) are fitted in an interference fit, and the magnetic shell (1) and the rotating shaft (4) are fitted in an interference fit.

3. The three-armature motor according to claim 2, characterized in that: The axial length of the sleeve fit between the hole wall of the through hole and the rotating shaft (4) is L, the diameter of the interference fit position between the rotating shaft (4) and the through hole is D, and L≥D / 2.

4. The three-armature motor according to claim 1, characterized in that: The tooth length of the first stator teeth on the outer circumferential side of the outer stator core (3a) is shorter than the tooth length of the second stator teeth on the inner circumferential wall of the outer stator core (3a); and / or the tooth length of the third stator teeth on the outer circumferential wall of the inner stator core (3b) is longer than the tooth length of the second stator teeth on the inner circumferential wall of the outer stator core (3a).

5. The three-armature motor according to claim 4, characterized in that: The outer stator core (3a) is coated with an outer frame (6), and the inner stator core (3b) is coated with an inner frame (7). The material of the outer frame (6) and the inner frame (7) is one of nylon PA66, PBT or PET.

6. The three-armature motor according to claim 5, characterized in that: The two axial end surfaces of the outer stator core (3a) wrapped with the outer frame (6) and the two axial end surfaces of the inner stator core (3b) wrapped with the inner frame (7) are connected as one piece via an injection molded part (3c).

7. The three-armature motor according to claim 6, characterized in that: The material of the injection molded part (3c) is bulk molding compound.

8. The three-armature motor according to claim 6, characterized in that: An axial end face of the outer stator core (3a) has a first region, the first region is a region not covered by the injection molded part (3c), and an axial end face of the inner stator core (3b) has a second region, the second region is a region not covered by the injection molded part (3c), and the first region and the second region are located on the same side of the stator assembly.

Images