Motor and range hood

Abstract

The utility model provides a motor and a range hood, and relates to the technical field of kitchen appliances, the motor provided by the utility model comprises a stator and a rotor, the rotor is located at the inner side of the stator, the stator comprises a stator iron core, and the proportion range of the inner diameter and the outer diameter of the stator iron core is 0.67-0.75; the rotor comprises a rotor outer core, the rotor outer core comprises a plurality of rotor outer iron cores and a plurality of magnets, and the rotor outer iron cores and the magnets are alternately arranged in a ring one by one; a magnet is clamped between every two adjacent rotor outer iron cores, a first bulge and a second bulge which protrude towards each other are arranged on the faces, facing each other, of every two adjacent rotor outer iron cores, the first bulges are used for limiting the radial outer end faces of the magnets, and the second bulges are used for limiting the radial inner end faces of the magnets.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a motor and a range hood. Background Technology

[0002] The range hood includes a housing and a fan assembly, wherein the fan assembly contains a motor, and the motor contains a rotor and a stator. The rotor rotates relative to the stator. The rotor includes multiple rotor outer iron cores and magnets clamped between two adjacent rotor outer iron cores, and is then wrapped in plastic.

[0003] However, the radial positions of the individual magnets may differ, resulting in poor rotor performance uniformity. Utility Model Content

[0004] The purpose of this utility model is to provide a motor and a range hood to alleviate the technical problem of poor uniformity in the existing motor assembly process.

[0005] In a first aspect, the present invention provides an electric motor comprising: a stator and a rotor, the rotor being located inside the stator, the stator comprising a stator core, the ratio of the inner and outer diameters of the stator core being in the range of 0.67-0.75;

[0006] The rotor includes an outer rotor core, which includes an outer rotor iron core and magnets. There are multiple outer rotor iron cores and magnets, which are arranged alternately in a ring. A magnet is sandwiched between two adjacent outer rotor iron cores. On the surfaces of the two adjacent outer rotor iron cores facing each other, there are first protrusions and second protrusions protruding in the direction of each other. The first protrusion is used to limit the radial outer end face of the magnet, and the second protrusion is used to limit the radial inner end face of the magnet.

[0007] Furthermore, the rotor also includes an inner core, which is located inside the outer core and the two are connected by an elastic body.

[0008] Furthermore, the radially outer end face of the rotor outer core is an arc surface, and the point farthest from the center of the rotor outer core on the radially outer end face of all the rotor outer cores forms a first circular range, with both ends of the arc surface circumferentially located inside the first circular range.

[0009] Furthermore, the outer diameter of the stator ranges from 95mm to 108mm.

[0010] Furthermore, the inner wall of the stator is provided with multiple teeth arranged at equal intervals along the circumference, with adjacent teeth spaced apart.

[0011] The surface of the tooth facing the center of the stator includes an arc surface and a first inclined surface and a second inclined surface symmetrically connected on opposite sides of the arc surface. The distance between the first inclined surface and the second inclined surface on the same tooth gradually increases radially from the inside to the outside.

[0012] Furthermore, it also includes a plastic-encapsulated body and end caps, with both the stator and rotor located within the cavity formed by the plastic-encapsulated body and end caps;

[0013] The encapsulated body is equipped with shock-absorbing pads, which have mounting holes.

[0014] Furthermore, the rotor's outer iron core and magnets are encapsulated into a single structure.

[0015] Furthermore, the stator includes a coil and a stator frame, with the coil wound around the stator frame and the stator frame molded onto the stator core.

[0016] Furthermore, the motor also includes a shaft, which is coaxially connected to the iron core inside the stator via bearings.

[0017] Secondly, the present invention provides a range hood that includes the aforementioned motor.

[0018] This utility model has at least the following advantages or beneficial effects:

[0019] The motor provided by this utility model includes: a stator and a rotor. The rotor is located inside the stator. The stator includes a stator core, and the ratio of the inner and outer diameters of the stator core is in the range of 0.67-0.75. The rotor includes a rotor outer core, which includes a rotor outer core and a magnet. There are multiple rotor outer cores and magnets, which are arranged alternately in a ring. A magnet is sandwiched between two adjacent rotor outer cores. On the surfaces of two adjacent rotor outer cores facing each other, there are first protrusions and second protrusions protruding in the direction of each other. The first protrusion is used to limit the radial outer end face of the magnet, and the second protrusion is used to limit the radial inner end face of the magnet.

[0020] In this embodiment, on the one hand, the ratio of the inner and outer diameters of the stator core ranges from 0.67 to 0.75. In the prior art, the ratio of the inner and outer diameters of the stator core of the motor in the fan assembly of a range hood is approximately 0.65. In this embodiment, the amount of copper used in the motor is effectively reduced, lowering costs. The larger rotor size can improve the motor's torque and efficiency. On the other hand, the first and second protrusions on two adjacent rotor outer cores can jointly limit the magnets from the radial inner and outer sides. During installation, this can serve a positioning function, ensuring that each magnet is evenly arranged along the circumference. During encapsulation, it can also serve a limiting function, preventing relative movement between the magnets and the rotor outer core, thereby improving product uniformity and reducing the defect rate.

[0021] The range hood provided by this utility model includes the aforementioned motor. Because the range hood provided by this utility model uses the aforementioned motor, it also possesses the advantages of a motor. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A cross-sectional view of the motor provided in an embodiment of this utility model;

[0024] Figure 2 A schematic diagram of the rotor and stator of the motor provided for an embodiment of this utility model;

[0025] Figure 3 for Figure 2 A magnified view of a portion of position A in the middle;

[0026] Figure 4 A schematic diagram of the rotor outer iron core of the motor provided in an embodiment of this utility model;

[0027] Figure 5 This is a schematic diagram of the teeth of a motor provided in an embodiment of the present invention.

[0028] Icons: 1-Plastic encapsulated body; 2-Shock-absorbing pad; 3-Stator core; 4-Stator frame; 5-Wire coil; 6-Rotor outer core; 7-Elastomer; 8-Rotor inner core; 9-Shaft; 10-Shaft pin; 11-Bearing; 12-Magnet; 13-End cap; 14-First protrusion; 15-Second protrusion; 16-Gear; 17-First inclined surface; 18-Second inclined surface; 19-First circular area. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] like Figures 1-5 As shown, the motor provided by this utility model includes: a stator, a rotor encapsulated body 1, and an end cover 13. The rotor is located inside the stator. The stator includes a stator core 3, a coil 5, and a stator frame 4. The coil 5 is wound around the stator frame 4, and the stator frame 4 is encapsulated in plastic on the stator core 3.

[0036] The encapsulated body 1 encapsulates the stator core 3, stator frame 4, and coil 5; the encapsulated body 1 is equipped with a damping shock absorber 2, which has mounting holes for connection with an external bracket.

[0037] Unlike existing technologies, the ratio of the inner and outer diameters of the stator core 3 is between 0.67 and 0.75. In existing technologies, the ratio of the inner and outer diameters of the stator core 3 of the motor in the fan assembly of a range hood is approximately 0.65. Therefore, in this embodiment, the stator volume is reduced, the volume of the slots for winding copper wire is reduced, and less copper wire is used. The motor effectively reduces copper usage, lowers costs, and the increased rotor size can improve motor torque and efficiency.

[0038] The rotor includes an outer rotor core, which includes an outer rotor iron core 6 and a magnet 12, which are connected by a plastic seal.

[0039] like Figures 2-4 As shown, there are multiple rotor outer iron cores 6 and magnets 12, which are arranged alternately in a ring. A magnet 12 is sandwiched between two adjacent rotor outer iron cores 6. On the surfaces of two adjacent rotor outer iron cores 6 facing each other, there are first protrusions 14 and second protrusions 15 protruding in the direction of each other. The surface of the first protrusion 14 facing outward is connected to the surface of the rotor outer iron core 6 facing outward, and the surface of the second protrusion 15 facing inward is connected to the surface of the rotor outer iron core 6 facing inward.

[0040] The distance between the first protrusion 14 and the second protrusion 15 is approximately equal to the radial length of the magnet 12. The first protrusion 14 is used to limit the radial outer end face of the magnet 12, and the second protrusion 15 is used to limit the radial inner end face of the magnet 12.

[0041] The first protrusion 14 and the second protrusion 15 on the two adjacent rotor outer iron cores 6 can limit the magnet 12 from the radial inner and outer sides. During installation, they can play a positioning role, so that each magnet 12 is evenly arranged along the circumference. During plastic sealing, they can also play a limiting role, preventing the magnet 12 from moving relative to the rotor outer iron core 6, thereby improving the uniformity of the product and reducing the defect rate.

[0042] In this embodiment, the rotor outer core is made in a split form, which can improve the utilization rate of iron core stamping material and reduce costs.

[0043] like Figure 2 As shown, the rotor also includes an inner rotor core, which is located inside the outer rotor core, and the two are connected by an elastic body 7. The rotor is divided into inner and outer parts, connected in the middle by the elastic body 7, which effectively reduces the resonance noise between the rotor and the external load.

[0044] like Figure 3As shown, the radially outer end face of the rotor outer core 6 is an arc surface, and the points on all the radially outer end faces of the rotor outer core 6 that are farthest from the center of the rotor outer core form a first circular range 19. The two endpoints of the arc surface in the circumferential direction are located inside the first circular range 19, rather than coinciding with the first circular range 19. The two endpoints of the arc surface contract inward, and the rotor outer core 6 is made into a plum blossom-shaped structure, that is... Figure 2 The rotor has ten petal-shaped outer iron cores 6, which reduces the cogging torque of the motor and lowers vibration and noise.

[0045] The stator's outer diameter ranges from 95mm to 108mm, offering good versatility, low noise, and high efficiency. The motor is compatible with machines using all sizes of fan blades, with costs comparable to small-diameter motors and performance improvements over large-diameter motors.

[0046] like Figure 5 As shown, the inner wall of the stator is provided with a plurality of teeth 16 arranged at equal intervals along the circumference, with adjacent teeth 16 spaced apart; the surface of the tooth 16 facing the center of the stator includes an arc surface, and a first inclined surface 17 and a second inclined surface 18 symmetrically connected on opposite sides of the arc surface, and the distance between the first inclined surface 17 and the second inclined surface 18 on the same tooth 16 gradually increases from the inside to the outside along the radial direction.

[0047] The tooth 16 is cut on both sides to form a first inclined surface 17 and a second inclined surface 18. In this way, the extension line of the first inclined surface 17 of one tooth 16 and the extension line of the second inclined surface 18 of the other tooth 16 intersect at an obtuse angle, which reduces the motor cogging torque and reduces vibration noise.

[0048] The motor also includes a rotating shaft 9, which is coaxially connected to the inner iron core of the stator via a bearing 11. The bearing 11 is fixed on the rotating shaft 9, the rotating shaft 9 is fixed on the inner iron core 8 of the rotor, and the shaft pin 10 is fixed on the rotating shaft 9. The bearing 11 is transitionally fitted with the end cover 13 and the plastic encapsulation body 1, and the end cover 13 is interference-fitted with the plastic encapsulation body 1.

[0049] The range hood provided by this utility model includes the aforementioned motor. Because the range hood provided by this utility model uses the aforementioned motor, it also possesses the advantages of a motor.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electric motor, comprising: A stator and a rotor, wherein the rotor is located inside the stator, characterized in that the stator includes a stator core (3), and the ratio of the inner and outer diameters of the stator core (3) is in the range of 0.67-0.75; The rotor includes a rotor outer core, which includes a rotor outer iron core (6) and a magnet (12). There are multiple rotor outer iron cores (6) and magnets (12), which are arranged alternately in a ring. A magnet (12) is sandwiched between two adjacent rotor outer iron cores (6), and each of the two adjacent rotor outer iron cores (6) has a first protrusion (14) and a second protrusion (15) protruding in the direction of each other. The first protrusion (14) is used to limit the radial outer end face of the magnet (12), and the second protrusion (15) is used to limit the radial inner end face of the magnet (12).

2. The motor according to claim 1, characterized in that, The rotor also includes an inner core (8), which is located inside the outer core of the rotor and the two are connected by an elastic body (7).

3. The motor according to claim 1, characterized in that, The radial outer end face of the rotor outer core (6) is an arc surface, and the point farthest from the center of the rotor outer core on the radial outer end face of all the rotor outer cores (6) forms a first circular range (19), and the two endpoints of the arc surface in the circumferential direction are located inside the first circular range (19).

4. The motor according to claim 1, characterized in that, The outer diameter of the stator ranges from 95mm to 108mm.

5. The motor according to claim 1, characterized in that, The inner wall of the stator is provided with a plurality of teeth (16) arranged at equal intervals along the circumference, with adjacent teeth (16) spaced apart; The tooth (16) facing the center of the stator includes an arc surface and a first inclined surface (17) and a second inclined surface (18) symmetrically connected on opposite sides of the arc surface. The distance between the first inclined surface (17) and the second inclined surface (18) on the same tooth (16) gradually increases radially from the inside to the outside.

6. The motor according to any one of claims 1-5, characterized in that, It also includes a plastic encapsulated body (1) and an end cap (13), wherein the stator and the rotor are both located within the cavity formed by the plastic encapsulated body (1) and the end cap (13); The encapsulated body (1) is provided with a shock-absorbing pad (2), and the shock-absorbing pad (2) has mounting holes.

7. The motor according to any one of claims 1-5, characterized in that, The rotor outer core (6) and magnet (12) are encapsulated as a single structure.

8. The motor according to any one of claims 1-5, characterized in that, The stator includes a coil (5) and a stator frame (4). The coil (5) is wound around the stator frame (4), and the stator frame (4) is plastic-coated onto the stator core (3).

9. The motor according to any one of claims 1-5, characterized in that, The motor also includes a rotating shaft (9), which is coaxially connected to the inner core of the stator via a bearing (11).

10. A range hood, characterized in that, Includes the motor described in any one of claims 1-9.

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