Motor stator and motor

Abstract

The utility model relates to the technical field of motor electric appliances, and discloses a motor stator and a motor, the motor stator is applied to the motor, and a plurality of teeth are arranged in the circumferential direction of a stator core at intervals; the stator framework comprises a first framework and a second framework, and the first framework and the second framework abut against each other and define a mounting space; the stator core is connected between the first framework and the second framework, the plurality of teeth are respectively located in the plurality of mounting spaces, and a winding groove is formed between every two adjacent mounting spaces; coils of the stator winding are wound in the winding grooves, and the number of grooves of each pole and each phase of the stator winding is a fraction. The number of slots of each pole and each phase of the stator winding is a fraction, so that the size of the end part of the stator winding is smaller, the space can be effectively utilized, the motor power density is improved, the iron core utilization rate is improved, and the torque ripple is reduced; the stator framework effectively realizes insulation between the stator winding and the stator iron core, can prevent copper wire paint skin from being scratched by the stator iron core during winding of the stator winding, and avoids turn-to-turn breakdown.

Description

Technical Field

[0001] The utility model relates to the technical field of motor electrical appliances, and particularly to a motor stator and a motor. Background Art

[0002] The motor stator is an important component in motor equipment such as motors and generators, and its performance directly affects the operating efficiency and stability of the motor. In a motor, the stator generates a rotating magnetic field to drive the rotor to rotate, realizing the conversion and transmission of electrical energy.

[0003] In the existing motor stator, the number of slots in the stator core per pole per phase is often selected as the least common multiple of the number of poles of the motor, and the stator winding is often directly wound on the stator core. However, the stator winding of this kind of motor stator is prone to being scratched during winding, and the utilization rate of the stator core is relatively low. Summary of the Utility Model

[0004] In view of this, the utility model provides a motor stator and a motor to solve the problems that the stator winding is prone to being scratched during winding and the utilization rate of the stator core is relatively low.

[0005] In the first aspect, the utility model provides a motor stator applied to a motor, including: a stator core, on the circumferential direction of which a plurality of teeth are arranged at intervals; a stator skeleton, the stator skeleton includes a first skeleton and a second skeleton, the lower end surface of the first skeleton abuts against the upper end surface of the second skeleton and encloses to form a plurality of installation spaces; the stator core is connected between the first skeleton and the second skeleton, the plurality of teeth are respectively located in the plurality of installation spaces, and a winding slot is formed between two adjacent installation spaces; a stator winding, the coils of the stator winding are wound in the winding slot, and the number of slots per pole per phase of the stator winding is a fraction.

[0006] Beneficial effects: The number of slots per pole per phase of the stator winding is a fraction, which makes the end size of the stator winding smaller. Under the same stator size, the space can be utilized more effectively, unnecessary space waste is reduced, the motor power density is improved, the utilization rate of the iron core is improved, and the torque ripple is reduced; the setting of the stator skeleton effectively realizes the insulation between the stator winding and the stator core, and can avoid the copper wire enameled coating of the stator winding being scratched by the stator core during winding, and avoid inter-turn breakdown.

[0007] In an optional embodiment, the first skeleton includes a main frame body and a first baffle, the first baffle is arranged on the upper end surface of the main frame body, and the first baffle is arranged on the inner edge of the main frame body.

[0008] Beneficial effects: By setting the first baffle, it plays a role in limiting the coils of the stator winding, which is convenient for coil combing.

[0009] In an alternative embodiment, the first skeleton further includes a second baffle, the second baffle is disposed on the upper end surface of the main frame body, and the second baffle is disposed on the outer edge of the main frame body.

[0010] Beneficial effects: By cooperatively arranging the second baffle and the first baffle, the copper wire winding is more compact and regular, which is beneficial to improving the slot filling factor and effectively utilizing the space in the slot.

[0011] In an alternative embodiment, the first baffle includes a plurality of sub-baffles, and the plurality of sub-baffles are evenly spaced on the main frame body.

[0012] Beneficial effects: Compared with an integral baffle, the structure is simplified, and the structural weight of the first baffle is reduced on the premise of ensuring the limiting effect.

[0013] In an alternative embodiment, an outlet hole is formed in the sub-baffle, and the coil of the stator winding is adapted to pass through the outlet hole.

[0014] Beneficial effects: The outlet of the stator winding passes through the outlet hole, effectively avoiding uneven heat dissipation when the three-phase windings are arranged in layers and stacked, and at the same time reducing the end height.

[0015] In an alternative embodiment, the sub-baffle includes a plate body and a flange, one end of the plate body is connected to the main frame body, the flange is connected to the other end of the plate body, and the outlet hole is arranged on the plate body.

[0016] Beneficial effects: By providing a flange structure, the coil of the stator winding is further limited, which is beneficial to restricting the winding height of the coil and making the copper wire winding more compact.

[0017] In an alternative embodiment, the motor stator further includes a slip ring, the slip ring is connected to the coil of the stator winding to form a star point, and the slip ring is connected to the second skeleton.

[0018] Beneficial effects: The use of the slip ring can significantly improve the overall performance of the system, reduce the possible twisting and wear of the stator winding coil during rotation, and thus avoid system failures and downtime.

[0019] In an alternative embodiment, the stator winding is a three-phase winding, the winding method of the stator winding is a concentrated winding, and the winding direction of the middle-phase winding of the stator winding is opposite to the winding direction of its adjacent phase.

[0020] In an alternative embodiment, the stator skeleton is integrally formed.

[0021] Beneficial effects: The integrally formed stator skeleton structure is more stable, not easily deformed, reduces the production cycle, and improves production efficiency.

[0022] In a second aspect, the present utility model also provides a motor, including the above-mentioned motor stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic diagram of the assembly structure of the stator core and the stator skeleton according to an embodiment of the present utility model;

[0025] Figure 2 Exploded view of the stator core and the stator skeleton according to an embodiment of the present utility model;

[0026] Figure 3 Schematic diagram of the structure of the stator skeleton according to an embodiment of the present utility model;

[0027] Figure 4 Schematic diagram of the structure of the first skeleton according to an embodiment of the present utility model;

[0028] Figure 5 For Figure 4 Partial enlarged view of A in

[0029] Figure 6 Schematic diagram of the structure of the stator core according to an embodiment of the present utility model;

[0030] Figure 7 Schematic diagram of the structure of the slip ring according to an embodiment of the present utility model;

[0031] Figure 8 Schematic diagram of the winding direction of the stator winding according to an embodiment of the present utility model (the coil is not shown).

[0032] Description of the reference numerals:

[0033] 10. Stator core; 11. Through hole; 20. Stator skeleton; 21. First skeleton; 211. Main frame body; 212. First baffle; 2121. Sub-baffle; 21211. Plate body; 21212. Flange; 21213. Wire outlet hole; 213. Second baffle; 214. First installation groove; 22. Second skeleton; 221. Second installation groove; 23. Winding groove; 24. Installation space; 30. Slip ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present utility model.

[0035] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 8 , describe the embodiments of the present utility model.

[0036] According to an embodiment of the present utility model, in a first aspect, the present utility model provides a motor stator applied to a motor, including a stator core 10, a stator skeleton 20, and a stator winding. A plurality of teeth are circumferentially spaced on the stator core 10; the stator skeleton 20 includes a first skeleton 21 and a second skeleton 22. The lower end surface of the first skeleton 21 abuts against the upper end surface of the second skeleton 22 and encloses to form a plurality of installation spaces 24; the stator core 10 is connected between the first skeleton 21 and the second skeleton 22. The plurality of teeth are respectively located in the plurality of installation spaces 24, and a winding groove 23 is formed between two adjacent installation spaces 24; the coils of the stator winding are wound in the winding groove 23, and the number of slots per pole per phase of the stator winding is a fraction.

[0037] Applying the motor stator of this embodiment, the number of slots per pole per phase of the stator winding is a fraction, making the end dimensions of the stator winding smaller. Under the same stator size, it can more effectively utilize the space, reduce unnecessary space waste, improve the motor power density, improve the utilization rate of the stator core 10, and reduce torque ripple; the setting of the stator skeleton 20 effectively realizes the insulation between the stator winding and the stator core 10, and can prevent the copper wire enameled coating of the stator winding from being scratched by the stator core 10 during winding, and avoid inter-turn breakdown.

[0038] Specifically, in this embodiment, the stator core 10 is formed by stacking silicon steel sheets, and the coils of the stator winding are enameled copper wires.

[0039] It should be noted that the number of poles of the motor is p, and the number of slots of the stator structure is Z. In the related art, the number of slots per pole per phase of the transmission motor stator structure is the least common multiple, that is, Z / 2p is an integer. The motor stator with integer slots has more slots, occupying more space, which may lead to a larger motor volume or heavier weight. While the number of slots of the fractional-slot motor stator is significantly reduced, which helps to reduce the space occupied by the winding groove 23 in the motor stator, improve the utilization rate of the motor space, and thus reduce the motor volume. At the same time, this is also beneficial to simplifying the motor manufacturing process and reducing the manufacturing cost.

[0040] It should be noted that, compared with the motor stator with integral slots, the motor stator with fractional slots usually has a smaller torque. This is because the fractional slot design can change the air gap structure, increase the number of torque fluctuations in one cycle, thereby reducing the torque amplitude and minimizing torque ripple.

[0041] Specifically, please refer to Figure 3 , a plurality of first mounting grooves 214 are provided on the first skeleton 21, a plurality of second mounting grooves 221 are provided on the second skeleton 22, the plurality of first mounting grooves 214 and the plurality of second mounting grooves 221 are arranged in one-to-one correspondence, the lower end surface of the first skeleton 21 abuts against the upper end surface of the second skeleton 22, and the first mounting groove 214 and the second mounting groove 221 communicate to form a mounting space 24, and a plurality of teeth of the stator core 10 are arranged in the plurality of mounting spaces 24.

[0042] Specifically, please refer to Figure 6 , a number of through holes 11 are provided on the stator core 10. The existence of the through holes 11 helps to improve the magnetic field distribution in the stator structure, can make the magnetic field distribution more uniform, reduce magnetic resistance and magnetic leakage, improve the magnetic flux utilization rate, and thus improve the performance and operating efficiency of the motor.

[0043] It should be noted that the lower end surface of the first skeleton 21 abuts against the upper end surface of the second skeleton 22, and the coils of the stator winding are wound in the winding grooves 23 and fasten the first skeleton 21 and the second skeleton 22 together.

[0044] Of course, in other alternative embodiments, the first skeleton 21 and the second skeleton 22 can also be fastened together through other connection structures. For example, the first skeleton 21 and the second skeleton 22 are connected by fasteners; or, plug connectors and slots are respectively provided on the first skeleton 21 and the second skeleton 22 to achieve the plug-in fixation of the first skeleton 21 and the second skeleton 22, etc.

[0045] In one embodiment, the stator skeleton 20 is integrally formed. The integrally formed stator skeleton 20 has a more stable structure, is not easily deformed, reduces the production cycle, and improves production efficiency.

[0046] Specifically, in this embodiment, both the first skeleton 21 and the second skeleton 22 are injection molded.

[0047] It can be understood that the setting of the stator skeleton 20 is equivalent to covering an insulating shell structure on the outer wall of the stator core 10, thereby realizing insulation between the coils of the stator winding and the stator core 10. At the same time, the surface of the injection molded stator skeleton 20 is smooth, which can avoid scratching the copper wire enameled coating during the winding of the stator winding, prevent inter-turn breakdown, and reduce the resistance during winding.

[0048] It should be noted that in the related art, the stator winding is directly wound around the stator core 10, and the enameled wire coating of the copper wire is scratched by the stator core 10 made of metal during the winding process, which affects the performance of the motor.

[0049] It should be noted that in other alternative embodiments, both the first skeleton 21 and the second skeleton 22 can be formed by split splicing. That is, the first skeleton 21 can be formed by splicing a number of sub-structures, and the second skeleton 22 can also be formed by splicing a number of sub-structures. Compared with the skeleton structure formed by split splicing, in the manufacturing process of the stator skeleton 20 in this embodiment, since the splicing and assembly of multiple components are reduced, the accumulation of errors is reduced, and the overall accuracy of the stator skeleton 20 is improved.

[0050] In one embodiment, as Figure 4 shown, the first skeleton 21 includes a main frame body 211 and a first baffle 212. The first baffle 212 is disposed on the upper end surface of the main frame body 211, and the first baffle 212 is disposed on the inner edge of the main frame body 211. By providing the first baffle 212, it plays a limiting role on the coils of the stator winding, facilitating the combing of the coils.

[0051] It should be noted that when the copper wire of the stator winding is wound, some copper wires may be squeezed to the inner side of the inner edge of the main frame body 211, which easily leads to loose or disordered winding. By providing the first baffle 212, when the copper wire of the stator winding is wound, the copper wire is limited at the inner edge of the main frame body 211, preventing the occurrence of disordered winding.

[0052] In one embodiment, as Figure 4 shown, the first skeleton 21 further includes a second baffle 213. The second baffle 213 is disposed on the upper end surface of the main frame body 211, and the second baffle 213 is disposed on the outer edge of the main frame body 211. By the cooperative setting of the second baffle 213 and the first baffle 212, the copper wire is wound more compactly and regularly during winding, which is beneficial to improving the slot fill factor and effectively utilizing the space in the slot.

[0053] Specifically, the winding space of the stator winding is limited between the first baffle 212 and the second baffle 213, which facilitates the selection of the winding space for the copper wire of the stator winding, prevents the copper wire of the stator winding from deviating from the winding slot 23 during the winding process, the copper wire is wound more compactly and regularly, the slot fill factor is improved, and thus the motor efficiency is enhanced.

[0054] In one embodiment, as Figure 4 shown, the first baffle 212 includes a number of sub-baffles 2121, and the number of sub-baffles 2121 are evenly spaced on the main frame body 211. Compared with an integral baffle, the structure is simplified, and the structural weight of the first baffle 212 is reduced on the premise of ensuring the limiting effect.

[0055] It should be noted that in the related art, the first baffle 212 is set as an integral baffle to achieve the limiting effect. In this embodiment, a plurality of spaced sub-baffles 2121 are used to achieve the same limiting effect, and the weight of the first baffle 212 is reduced, thereby reducing the weight of the entire motor stator.

[0056] In one embodiment, as Figure 4 and Figure 5 shown, the sub-baffle 2121 is provided with a wire outlet hole 21213, and the coils of the stator winding are adapted to pass through the wire outlet hole 21213. The stator winding wire exits through the wire outlet hole 21213, effectively avoiding uneven heat dissipation when the three-phase windings are stacked in layers, and at the same time reducing the end height.

[0057] It should be noted that the outlet end of the stator winding directly passes through the wire outlet hole 21213, making the installation and wiring of the stator winding simpler and faster, reducing the stacking and covering of the stator winding, and the stator winding has more heat dissipation area, so that the heat can be more evenly dissipated into the surrounding environment, improving the heat dissipation efficiency of the motor.

[0058] In one embodiment, as Figure 5 shown, the sub-baffle 2121 includes a plate body 21211 and a flange 21212. One end of the plate body 21211 is connected to the main frame 211, the flange 21212 is connected to the other end of the plate body 21211, and the wire outlet hole 21213 is provided on the plate body 21211. By setting the flange 21212 structure, the coils of the stator winding are further limited, which is beneficial to restricting the winding height of the coils and making the copper wire winding more compact.

[0059] Specifically, in this embodiment, the plate body 21211 and the flange 21212 are integrally formed by injection molding.

[0060] It can be understood that when the height of the coils of the stator winding is too high, the upper end of the coils will abut against the flange 21212, thereby restricting the further increase of the winding height of the coils.

[0061] Of course, in other alternative embodiments, the sub-baffle 2121 only includes the plate body 21211, one end of the plate body 21211 is connected to the main frame 211, and the other end of the plate body 21211 is bent to form a flange 21212.

[0062] Of course, in other alternative embodiments, the plate body 21211 and the flange 21212 can also be separately provided, one end of the plate body 21211 is connected to the main frame 211, and the flange 21212 is bonded to the other end of the plate body 21211.

[0063] In one embodiment, as Figure 7As shown, the motor stator further includes a slip ring 30. The slip ring 30 is connected to the coils of the stator winding to form a star point, and the slip ring 30 is connected to the second skeleton 22. The use of the slip ring 30 can significantly improve the overall performance of the system, reduce the possible twisting and wear of the stator winding coils during rotation, and thus avoid system failures and downtime.

[0064] Specifically, the slip ring 30 is a PCB board made of copper foil.

[0065] Of course, in other alternative embodiments, the material of the slip ring 30 can also be selected according to actual situations, such as graphite, etc.

[0066] In one embodiment, as Figure 8 shown, the stator winding is a three-phase winding, the winding method of the stator winding is a concentrated winding, and the winding direction of the middle-phase winding of the stator winding is opposite to that of its adjacent phase.

[0067] Specifically, the stator winding has a total of three phases, U, V, and W. The outgoing ends of the three-phase lines are uniformly distributed on one side of the first skeleton 21 and pass through the outgoing holes 21213 on the sub-baffle 2121, leaving enough length to connect the terminal or the corresponding specification cable; the non-outgoing ends of the three-phase lines are uniformly distributed on one side of the second skeleton 22 and are welded and fixed through the slip ring 30 to form a star point.

[0068] Further, the U-phase copper wire is wound in the Figure 8 shown winding direction, starting from the first tooth, and successively winding around the fifth tooth, the sixth tooth, the tenth tooth, the fourteenth tooth, and the fifteenth tooth, and a lead-out end is branched out on the left side of the winding groove 23; the V-phase copper wire is wound in the Figure 8 shown winding direction, starting from the second tooth, and successively winding around the third tooth, the seventh tooth, the eleventh tooth, the twelfth tooth, and the sixteenth tooth, and a lead-out end is branched out on the right side of the winding groove 23; the W-phase copper wire is wound in the Figure 8 shown winding direction, starting from the fourth tooth, and successively winding around the eighth tooth, the ninth tooth, the thirteenth tooth, the seventeenth tooth, and the eighteenth tooth, and a lead-out end is branched out on the left side of the winding groove 23; that is, the winding direction on the teeth corresponding to the middle-phase winding is opposite to that of the adjacent phase, so that the winding forms a 120° phase belt, and the slip ring 30 is welded to the non-outgoing ends of the stator winding.

[0069] Of course, in other alternative embodiments, the winding method of the stator winding can also be a distributed winding, such as a concentric winding, a lap winding, etc.

[0070] According to an embodiment of the present invention, in a second aspect, the present invention further provides a motor, including the above-mentioned motor stator.

[0071] Although embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the present utility model.

Claims

1. A motor stator, applied to a motor, characterized in that: include: A stator core (10), wherein a plurality of teeth are arranged at intervals in the circumferential direction of the stator core (10); A stator frame (20), the stator frame (20) comprising a first frame (21) and a second frame (22), the lower end surface of the first frame (21) abutting against the upper end surface of the second frame (22) and enclosing to form a plurality of installation spaces (24); the stator core (10) is connected between the first frame (21) and the second frame (22), the plurality of teeth are respectively located in the plurality of installation spaces (24), and a winding slot (23) is formed between two adjacent installation spaces (24); A stator winding, wherein the coils of the stator winding are wound in the winding slots (23), and the number of slots per pole and per phase of the stator winding is a fraction.

2. The motor stator according to claim 1, characterized in that: The first frame (21) comprises a main frame body (211) and a first baffle (212), wherein the first baffle (212) is arranged on the upper end surface of the main frame body (211), and the first baffle (212) is arranged on the inner edge of the main frame body (211).

3. The motor stator according to claim 2, characterized in that: The first frame (21) further comprises a second baffle (213), wherein the second baffle (213) is arranged on the upper end surface of the main frame (211), and the second baffle (213) is arranged on the outer edge of the main frame (211).

4. The motor stator according to claim 2, characterized in that: The first baffle (212) comprises a plurality of sub-baffles (2121), and the plurality of sub-baffles (2121) are evenly spaced and arranged on the main frame (211).

5. The motor stator according to claim 4, characterized in that: The sub-baffle (2121) is provided with a wire outlet hole (21213), and the coil of the stator winding is suitable for passing through the wire outlet hole (21213).

6. The motor stator according to claim 5, characterized in that: The sub-baffle (2121) comprises a plate body (21211) and a flange (21212); one end of the plate body (21211) is connected to the main frame body (211); the flange (21212) is connected to the other end of the plate body (21211); and the wire outlet hole is arranged on the plate body (21211).

7. The motor stator according to any one of claims 1 to 6, characterized in that: The motor stator further comprises a collector ring (30), wherein the collector ring (30) is connected to the coil of the stator winding to form a star point, and the collector ring (30) is connected to the second frame (22).

8. The motor stator according to any one of claims 1 to 6, characterized in that: The stator winding is a three-phase winding, the winding mode of the stator winding is a centralized winding, and the winding direction corresponding to the middle phase winding of the stator winding is opposite to the winding direction of the adjacent phase.

9. The motor stator according to any one of claims 1 to 6, characterized in that: The stator frame (20) is integrally formed.

10. A motor, characterized in that: A motor stator comprising any one of claims 1 to 9.

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