Half-split tooth yoke separation type outer rotor iron core structure for concentrated winding type motor

Abstract

The invention discloses a split-half tooth yoke separation type outer rotor core structure for a concentrated winding type motor, and relates to the field of stator and rotor core structures, and the split-half tooth yoke separation type outer rotor core structure is characterized in that magnetic steel is uniformly arranged on the inner side of a rotor core body at equal intervals, a stator core is arranged on the inner side of the rotor core body, and the stator core is of a tooth yoke separation type structure; the inner side end part of the stator core is a stator tooth part, and the stator tooth part is of a split-half structure. According to the split-half tooth yoke separation type outer rotor iron core structure for the concentrated winding type motor, a circle of magnetic steel which is uniformly distributed is arranged on the inner side of a rotor iron core body, a stator iron core is correspondingly arranged on the inner side of the rotor iron core body, the stator iron core is in a tooth yoke separation type design, and a stator tooth part adopts a split-half type structure; and after all the flat copper wires are wound, the flat copper wires are integrally spliced and formed, and the groove type of the stator iron core is a parallel groove design, so that the space utilization rate of the stator groove is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of stator and rotor core structure technology, specifically to a split-tooth yoke separate external rotor core structure for a concentrated winding motor. Background Technology

[0002] Concentrated winding motors mainly refer to the arrangement of stator windings, while the rotor structure varies depending on the type of motor. In a concentrated winding permanent magnet synchronous motor, the core function of the rotor core is to carry and guide the magnetic field of the permanent magnet, which interacts with the pulsating magnetic field generated by the concentrated winding of the stator to achieve electromechanical energy conversion.

[0003] In existing technologies, motors have low efficiency, high friction between the rotor core and the shaft, and a low overall service life.

[0004] To overcome the above shortcomings, a prior art Chinese patent (publication number CN118300295A) discloses a rotor core comprising multiple laminations, each lamination having a mounting hole. The mounting hole is circular, and the edge of the mounting hole has multiple grooves evenly spaced. The multiple laminations are stacked and fixed together along the height direction to form the rotor core. The mounting holes of the multiple laminations are coaxially arranged to form a through hole for mounting a shaft. Adjacent laminations are staggered by a fixed angle, so that the grooves of adjacent laminations are staggered and continuous in the height direction to form a contact surface. The contact surface is helical. The shaft is mounted in the through hole, and the contact surface abuts against the outer wall of the shaft. The groove between two adjacent contact surfaces forms a cooling channel with the outer wall of the shaft. Through the above design, while maintaining the heat dissipation performance between the shaft and the rotor core, the multiple helical contact surfaces distribute the contact between the outer wall of the shaft and the grooves of the rotor core across the entire outer circumference, increasing the friction between the rotor core and the shaft and extending the service life of the motor.

[0005] Although existing technologies can overcome the shortcomings mentioned above, other problems still exist in their operation, such as: the stator core torque inside the rotor core is high, the stator slot space utilization rate of the stator core is low, which can easily affect the overall performance. Concentrated winding motors have lower performance and low utilization rate. Summary of the Invention

[0006] The purpose of this invention is to provide a split-tooth yoke separate external rotor core structure for a concentrated winding motor, in order to solve the problems mentioned in the background art, such as high stator core torque on the inner side of the rotor core, low stator slot space utilization of the stator core, which easily affects the overall performance, resulting in low performance and low utilization of the concentrated winding motor.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a split-yoke external rotor core structure for a concentrated winding motor, comprising a rotor core body, wherein magnets are evenly spaced on the inner side of the rotor core body, and a stator core is provided on the inner side of the rotor core body, and the stator core has a split-yoke structure, wherein the inner end of the stator core is a stator tooth portion, and the stator tooth portion has a split-yoke structure, wherein a stator slot is opened at the middle end of the stator core, and a reinforcing rib is opened on the outer side of the stator slot, thereby increasing the overall structural strength and reducing the motor cogging torque.

[0008] Furthermore, the stator slot width is h1, the maximum stator tooth dimension is h2, the minimum stator tooth dimension is h3, the maximum magnet width is h4, the stator slot shoulder height is b1, the magnet thickness is b2, the stator tooth angle is α, the magnet angle is β, and the motor air gap is δ. These characteristics satisfy the following: .

[0009] Furthermore, the outer diameter of the stator core is D1, the inner diameter of the stator core is Di1, the outer diameter of the rotor core body is D2, the inner diameter of the rotor core body is Di2, and the spacing between the magnets after arrangement is h5. These characteristics satisfy: (D1 / Di1) / 3δ <h5<(D2 / Di2) / δ。

[0010] Furthermore, the prefabricated coil is sequentially inserted into the teeth from the root of the teeth, and the entire copper wire is spliced ​​together after all the copper wires are wrapped around the teeth.

[0011] Furthermore, the stator slots are parallel slots, which significantly improve slot utilization compared to parallel teeth.

[0012] Furthermore, the stator slot is provided with a winding, and the winding is a flat wire, and the winding is a coil prefabricated to match the tooth profile.

[0013] Furthermore, the stator core is installed by cold pressing the two stator teeth with the installed windings onto the stator yoke as a whole, with the stator teeth and stator yoke having an interference fit.

[0014] Furthermore, a ring of evenly arranged magnets is provided in the inner circle of the rotor core body. The magnets are fixed by adhesive bonding, and the magnets are positioned by using tooling to limit the circumferential dimensions of the magnets before bonding.

[0015] Furthermore, the windings are evenly spaced in the stator slots, and the spacing between windings is the same as the spacing between the windings and the insulating paper.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This concentrated winding motor adopts a split-tooth yoke separation external rotor stator and rotor core structure. The outer side is set as the rotor core, and a ring of evenly distributed magnets is arranged inside the rotor core body. The inner side is set as the stator core. The stator core is a split-tooth yoke design. Its stator teeth adopt a split-tooth structure. During manufacturing, flat copper wire is first wound around each stator tooth segment. After all the flat copper wires are wound, they are spliced ​​together as a whole. The slot shape of the stator core is a parallel slot design, which helps to greatly improve the space utilization of the stator slots. Furthermore, a reinforcing rib structure is specially provided on the outside of the stator slot. Compared with the absence of reinforcing ribs, this can effectively enhance the overall mechanical strength of the stator core and also help reduce the cogging torque of the motor.

[0017] 2. The stator yoke is cold-pressed onto the stator teeth of the stator core. The stator teeth and stator yoke are interference fit. This concentrated winding motor has the outstanding feature of high torque density. Its structural design significantly improves the core slot fill factor, thereby improving material utilization efficiency and overall motor performance, and ultimately achieving higher motor power density. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the trapezoidal reinforcing rib stator and rotor laminations and winding magnet structure of the present invention.

[0019] Figure 2 For the present invention Figure 1 Schematic diagram of the structure at point A in the middle.

[0020] Figure 3 This is a schematic diagram of the rectangular reinforcing rib stator and rotor laminations and winding magnet structure of the present invention.

[0021] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0022] Figure 5 This is a schematic diagram of the stator and rotor laminations and winding magnet structure of the present invention.

[0023] Figure 6 This is a partial schematic diagram of the stator and rotor laminations and winding magnets of the present invention.

[0024] Figure 7 This is a schematic diagram of the stator core structure of the present invention.

[0025] Figure 8 This is a partial schematic diagram of the stator core of the present invention.

[0026] Figure 9 This is a schematic diagram of the stator core tooth splicing structure of the present invention.

[0027] Figure 10 This is a schematic diagram of the splicing structure of the half-piece stator core teeth of the present invention.

[0028] Figure 11 This is a schematic diagram of the stator core yoke structure of the present invention.

[0029] Figure 12 This is a schematic diagram of the rotor core structure of the present invention.

[0030] Figure 13 This is a schematic diagram of the magnet structure of the present invention.

[0031] Figure 14 The curves showing the effect of current on efficiency in this application and prior art are shown.

[0032] Figure 15 The curves showing the influence of electrical angle on cogging torque in this application and prior art are shown.

[0033] In the diagram: 1. Rotor core body; 2. Stator core; 3. Magnet; 4. Stator yoke; 5. Stator teeth; 6. Stator slot; 7. Winding. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1: As Figures 1-15 The technical solution shown is a split-yoke external rotor core structure for a concentrated winding motor. To solve the problems of low torque density, low efficiency, and insufficient power density, the following is disclosed: a rotor core body 1, with magnets 3 evenly spaced on the inner side of the rotor core body 1, and a stator core 2 on the inner side of the rotor core body 1. The stator core 2 has a split-yoke structure, and the inner end of the stator core 2 is a stator tooth 5, which has a split-yoke structure. A stator slot 6 is opened at the middle end of the stator core 2, and reinforcing ribs are opened on the outer side of the stator slot 6 to increase the overall structural strength and reduce the motor cogging torque.

[0036] Traditional stator core 2 is usually an integral structure, and the integral structure of stator core 2 uses semi-closed slots with narrow slot openings. When winding, the wires must be inserted one by one through the narrow slot openings. For some large-diameter windings 7, it may not be possible to assemble them. However, after setting the stator core 2 as a tooth-yoke separated structure, since the teeth are independent and the slot openings are wider, the windings 7 can be wound separately before the stator core 2 is assembled. The windings 7 can be directly fitted onto the teeth, or the teeth can be inserted into the pre-wound coils, and then the teeth and yoke can be assembled and fixed.

[0037] The existing stator tooth section 5 is a one-piece structure. Therefore, when actually placing the winding 7, factors such as dimensional tolerance or winding coil expansion may prevent the last winding 7 from being placed in the stator slot 6. However, by setting the stator tooth section 5 as a split structure, the winding 7 can be placed in place first during the assembly of the winding 7, and then the split stator tooth section 5 can be closed and fixed, thereby closing the magnetic circuit of the entire stator core 2 and wrapping all the windings 7.

[0038] The stator slot 6 has a width of h1, the stator tooth 5 has a maximum dimension of h2, the stator tooth 5 has a minimum dimension of h3, the magnet 3 has a maximum width of h4, the stator slot 6 has a shoulder height of b1, the magnet 3 has a thickness of b2, the stator tooth 5 has an angle of α, the magnet 3 has an angle of β, and the motor air gap is δ. These characteristics satisfy the following: .

[0039] The outer diameter of stator core 2 is D1, the inner diameter of stator core 2 is Di1, the outer diameter of rotor core body 1 is D2, the inner diameter of rotor core body 1 is Di2, and the spacing between magnets 3 after arrangement is h5. The characteristic satisfies: (D1 / Di1) / 3δ <h5<(D2 / Di2) / δ。

[0040] The prefabricated coil is sequentially inserted into the tooth from the root of the tooth 5 around the winding 7. After all the copper wires are wrapped around the tooth, the whole assembly is then performed.

[0041] The stator slot 6 is a parallel slot, which significantly improves slot utilization compared to parallel teeth.

[0042] The stator slot 6 is equipped with a winding 7, and the winding 7 is a flat wire. The winding 7 is a coil prefabricated to match the tooth profile.

[0043] The stator core 2 is installed by cold pressing the two stator teeth 5, after the winding 7 is installed, onto the stator yoke 4. The stator teeth 5 and the stator yoke 4 are interference fit.

[0044] The inner ring of the rotor core body 1 is provided with a ring of evenly arranged magnets 3. The magnets 3 are fixed by adhesive bonding. The magnets 3 are positioned by using tooling to limit the circumferential dimensions of the magnets 3 before bonding.

[0045] The windings 7 are evenly spaced in the stator slots 6, and the spacing between windings 7 is the same as the spacing between windings 7 and insulating paper.

[0046] This concentrated winding type 7 motor adopts a split-tooth yoke separated external rotor and stator core structure. The outer side is set as the rotor core, and a ring of evenly distributed magnets 3 is arranged on the inner side of the rotor core body 1. The inner side is correspondingly set as the stator core 2. The stator core 2 has a split-tooth yoke design, and its stator teeth 5 adopt a split-tooth structure. During manufacturing, flat copper wire is first wound around each segment of the stator teeth 5. After all the flat copper wires are wound, they are spliced ​​together as a whole. The slots of the stator core 2 are parallel slots, which helps to significantly improve the stator slots 6. In addition to improving space utilization, a reinforcing rib structure is specially opened on the outside of the stator slot 6, which can effectively enhance the overall mechanical strength of the stator core 2 and also help reduce the cogging torque of the motor. The stator yoke 4 is installed on the stator teeth 5 of the stator core 2 by cold pressing. The stator teeth 5 and the stator yoke 4 are interference fit. This concentrated winding type 7 motor has the outstanding feature of high torque density. Its structural design significantly improves the core slot fill factor, thereby improving material utilization efficiency and overall motor performance, and ultimately achieving higher motor power density.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A split-tooth yoke separate external rotor core structure for a concentrated winding motor, comprising a rotor core body (1), characterized in that: The rotor core body (1) is provided with magnets (3) evenly spaced on the inner side, and the rotor core body (1) is provided with a stator core (2) on the inner side. The stator core (2) is a tooth-yoke separation structure. The inner end of the stator core (2) is a stator tooth (5), and the stator tooth (5) is a split structure. The middle end of the stator core (2) is provided with a stator slot (6), and the outer side of the stator slot (6) is provided with reinforcing ribs to increase the overall structural strength and reduce the motor cogging torque.

2. The split-tooth yoke separate external rotor core structure for a concentrated winding motor according to claim 1, characterized in that: The stator slot (6) has a width of h1, the stator tooth (5) has a maximum dimension of h2, the stator tooth (5) has a minimum dimension of h3, the magnet (3) has a maximum width of h4, the stator slot (6) has a shoulder height of b1, the magnet (3) has a thickness of b2, the stator tooth (5) has an angle of α, the magnet (3) has an angle of β, and the motor air gap is δ. These characteristics satisfy the following: .

3. The split-tooth yoke separate external rotor core structure for a concentrated winding motor according to claim 1, characterized in that: The stator core (2) has an outer diameter of D1 and an inner diameter of Di1. The rotor core body (1) has an outer diameter of D2 and an inner diameter of Di2. The magnets (3) are arranged with a spacing of h5. The characteristic satisfies: (D1 / Di1) / 3δ <h5<(D2 / Di2) / δ。 4. The split-tooth yoke separate external rotor core structure for a concentrated winding motor according to claim 1, characterized in that: The prefabricated coil is sequentially inserted into the tooth from the root of the tooth on the stator tooth (5) and then spliced ​​together after all the copper wires are wrapped around it.

5. The split-tooth yoke separate external rotor core structure for a concentrated winding motor according to claim 1, characterized in that: The stator slot (6) is a parallel slot.

6. The split-tooth yoke separate external rotor core structure for a concentrated winding motor according to claim 1, characterized in that: The stator slot (6) is provided with a winding (7), and the winding (7) is a flat wire. The winding (7) is a coil prefabricated to match the tooth shape.

7. The split-tooth yoke separate external rotor core structure for a concentrated winding motor according to claim 1, characterized in that: The stator core (2) is installed by cold pressing the two stator teeth (5) after the winding (7) is installed onto the stator yoke (4) as a whole. The stator teeth (5) and the stator yoke (4) are interference fit.

8. The split-tooth yoke separate external rotor core structure for a concentrated winding motor according to claim 1, characterized in that: The rotor core body (1) has a ring of evenly arranged magnets (3) in the inner ring. The magnets (3) are fixed by adhesive bonding. The magnets (3) are positioned by tooling, which limits the circumferential dimensions of the magnets (3) during bonding.

9. The split-tooth yoke separate external rotor core structure for a concentrated winding motor according to claim 6, characterized in that: The windings (7) are evenly spaced in the stator slots (6), and the spacing between windings (7) is the same as the spacing between windings (7) and insulating paper.

Images