Casing of external rotor motor

Abstract

The utility model relates to the technical field of external rotor motors, in particular to a casing of an external rotor motor. The rotor comprises a rotor yoke and magnetic conductive protrusions, and the cross section of the rotor yoke is annular. The magnetic conduction protrusions are punch forming parts, the rear end faces of the magnetic conduction protrusions are in an arc shape, the diameter of the arc shape is the same as the diameter of the inner wall face of the rotor yoke, and bonding layers are arranged between the magnetic conduction protrusions and the rotor yoke so that the multiple magnetic conduction protrusions can be fixedly connected with the rotor yoke. The rear end faces of the magnetic conduction protrusions are connected with the inner wall face of the rotor yoke, the multiple magnetic conduction protrusions are evenly distributed in the circumferential direction of the inner wall face of the rotor yoke, the magnetic conduction protrusions are made of magnetic conduction low-carbon steel materials, the surfaces of the magnetic conduction protrusions are provided with anti-rust layers, and the anti-rust layers are nickel-plated anti-rust layers or zinc-plated anti-rust layers. The types of the anti-rust layer include but not limited to a nickel-plated anti-rust layer and a zinc-plated anti-rust layer. According to the technical scheme, the problems that the manufacturing cost of the machine shell is high, and the output torque of the outer rotor motor is insufficient are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of external rotor motors, in particular to a casing of an external rotor motor. Background Art

[0002] Outer rotor motors are usually used under low-speed and high-torque conditions, such as dough mixers and hub motors. The casing of traditional outer rotor motors is usually made of precision steel pipes made of magnetic low-carbon steel, and the permanent magnets on them are usually surface-mounted. This type of rotor only has permanent magnetic torque but no magnetic resistance torque. In order to save motor costs, the existing technology uses low-remanence permanent magnets such as ferrite, which results in the motor output torque being too small.

[0003] In order to achieve high torque output, traditional outer rotor motors usually use rare earth permanent magnet materials, such as sintered NdFeB, for their permanent magnets. However, rare earth permanent magnet materials are expensive, resulting in excessively high motor costs. If the motor permanent magnets use low-cost, low-remanence materials such as ferrite, the motor output torque will be insufficient. In order to ensure that the motor still has high torque output when using low-remanence permanent magnets, the motor's reluctance torque must be utilized.

[0004] like Figure 1 As shown in Figure 2, in an outer rotor motor, if the reluctance torque is used, the salient pole ratio of the motor needs to be increased. In a traditional outer rotor motor, the permanent magnets are surface mounted, the inner circle of the casing is a full circle, and the rotor salient pole ratio is basically zero. Figure 2 As shown, according to the processing technology of the prior art, the magnetic protrusions can be added to the rotor casing by cold drawing, or the entire casing can be made of laminated silicon steel sheets, which is very costly. Utility Model Content

[0005] In order to solve the problems in the related art, the utility model provides a casing of an outer rotor motor, which solves the problems of high manufacturing cost of the casing and insufficient output torque of the outer rotor motor.

[0006] To solve the above problems, the following technical solutions are provided:

[0007] The utility model provides a casing of an outer rotor motor, comprising a rotor yoke and magnetic conductive protrusions, wherein the cross section of the rotor yoke is annular; the magnetic conductive protrusions are stamped parts, and an adhesive layer is provided between the magnetic conductive protrusions and the rotor yoke, so that a plurality of magnetic conductive protrusions are fixedly connected to the rotor yoke, and the plurality of magnetic conductive protrusions are uniformly distributed along the circumferential direction of the inner wall surface of the rotor yoke; the magnetic conductive protrusions are made of magnetic low-carbon steel; and the surface of the magnetic conductive protrusions is provided with an anti-rust layer.

[0008] In the above scheme, the rotor yoke and the magnetic protrusion are set, and the magnetic protrusion is stamped, so that the cost of manufacturing the magnetic protrusion is reduced. The rotor yoke and the magnetic protrusion are processed separately, which can greatly reduce the processing cost of the casing, thereby solving the problem of high manufacturing cost of the casing; and the magnetic protrusion is made of magnetic low-carbon steel. The low-carbon steel has high magnetic permeability and can provide magnetic resistance torque for the outer rotor motor, thereby improving the efficiency of the outer rotor motor, so that the outer rotor motor can convert electrical energy and mechanical energy more efficiently during operation. Compared with high-strength steel or stainless steel and other materials, low-carbon steel has a lower cost, which can effectively reduce the manufacturing cost of the outer rotor motor; the surface of the magnetic protrusion has an anti-rust layer, which helps to bond the magnetic protrusion to the rotor yoke. The types of anti-rust layers include but are not limited to nickel-plated anti-rust layers and zinc-plated anti-rust layers.

[0009] The rear end surface of the magnetic conductive protrusion is arc-shaped, and the diameter of the arc is the same as the diameter of the inner wall surface of the rotor yoke. The rear end surface of the magnetic conductive protrusion is connected to the inner wall surface of the rotor yoke.

[0010] Through the above scheme, the rear end face of the magnetic protrusion is adapted to the inner wall surface of the stator yoke, which not only helps to connect the magnetic protrusion and the rotor yoke, but also reduces the air gap between the magnetic protrusion and the rotor yoke, thereby improving the salient pole ratio of the outer rotor motor, helping to increase the magnetic resistance torque of the outer rotor motor, and making the outer rotor motor have a large torque output, thereby solving the problem of small output torque of the outer rotor motor.

[0011] The two sidewall surfaces of the magnetic conductive protrusion are parallel to each other.

[0012] Through the above scheme, a permanent magnet is arranged between two adjacent magnetic protrusions, and the two side wall surfaces of the magnetic protrusion are arranged in parallel, so that the permanent magnet is mainly subjected to radial attraction and radial repulsion inside the outer rotor motor. The magnetic protrusions on both sides of the permanent magnet can provide support for the permanent magnet, preventing the permanent magnet from being subjected to radial attraction and displacement.

[0013] The anti-rust layer is a nickel-plated anti-rust layer.

[0014] Through the above solution, the nickel-plated anti-rust layer has a higher hardness, which can improve the wear resistance of the casing surface. The nickel-plated anti-rust layer has high stability and strong corrosion resistance in the air, effectively protecting the magnetic protrusions from corrosion.

[0015] The anti-rust layer is a galvanized anti-rust layer.

[0016] Through the above solution, the surface of the magnetic protrusion has a galvanized anti-rust layer, which can prevent the magnetic protrusion from rusting to a certain extent, thereby extending the service life of the outer rotor motor.

[0017] The bonding layer is a glue layer, and the magnetic protrusion and the rotor yoke are bonded together by glue, so that the magnetic protrusion and the rotor yoke are fixedly matched.

[0018] Through the above solution, the magnetic protrusion and the rotor yoke are bonded together with glue, thereby greatly reducing the processing cost of the casing.

[0019] The above solution has the following advantages:

[0020] 1. The utility model provides a rotor yoke and a magnetic protrusion, and the magnetic protrusion is formed by stamping, so that the cost of manufacturing the magnetic protrusion is reduced. The rotor yoke and the magnetic protrusion are processed separately, which can greatly reduce the processing cost of the casing. The magnetic protrusion is made of magnetic low-carbon steel. The low-carbon steel has a high magnetic permeability and can provide magnetic resistance torque for the outer rotor motor, thereby improving the efficiency of the outer rotor motor, so that the outer rotor motor can more efficiently convert electrical energy and mechanical energy during operation. Compared with high-strength steel or stainless steel and other materials, low-carbon steel has a lower cost, which can effectively reduce the manufacturing cost of the outer rotor motor. The surface of the magnetic protrusion has an anti-rust layer, which helps to bond the magnetic protrusion to the rotor yoke. The types of anti-rust layers include but are not limited to nickel-plated anti-rust layers and zinc-plated anti-rust layers.

[0021] 2. The rear end face of the magnetic protrusion is arc-shaped, and the diameter of the arc is the same as the diameter of the inner wall of the rotor yoke. The rear end face of the magnetic protrusion is connected to the inner wall of the rotor yoke, and the rear end face of the magnetic protrusion is adapted to the inner wall of the stator yoke, which not only helps to combine the magnetic protrusion and the rotor yoke, but also reduces the air gap between the magnetic protrusion and the rotor yoke, thereby improving the salient pole ratio of the outer rotor motor, helping to increase the magnetic resistance torque of the outer rotor motor, and making the outer rotor motor have a large torque output.

[0022] 3. A permanent magnet is arranged between two adjacent magnetic protrusions, and the two side walls of the magnetic protrusion are parallel to each other, so that the permanent magnet is mainly subjected to radial attraction and radial repulsion inside the outer rotor motor. The magnetic protrusions on both sides of the permanent magnet can provide support for the permanent magnet, preventing the permanent magnet from being subjected to radial attraction and displacement.

[0023] 4. Nickel plating is applied on the surface of the magnetic protrusion. The hardness of the nickel-plated anti-rust layer is relatively high, which can improve the wear resistance of the casing surface. The nickel-plated anti-rust layer has high stability and strong corrosion resistance in the air, which effectively protects the magnetic protrusion from corrosion. Galvanizing on the surface of the magnetic protrusion can prevent the magnetic protrusion from rusting to a certain extent, thereby extending the service life of the outer rotor motor; the magnetic protrusion and the rotor yoke are bonded with glue, which is beneficial to significantly reduce the processing cost of the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the utility model easier to understand, the present invention is further described in detail below based on specific embodiments of the utility model in conjunction with the accompanying drawings, wherein:

[0025] Figure 1 Schematic diagram of an outer rotor motor housing with a surface-mounted permanent magnet in the prior art;

[0026] Figure 2 Schematic diagram of an outer rotor motor housing in which a rotor yoke and a magnetic conductive protrusion are integrated in the prior art;

[0027] Figure 3 This is a schematic diagram of a casing of an outer rotor motor of the present invention;

[0028] Figure 4 This is a schematic diagram of a magnetically conductive protrusion in a casing of an outer rotor motor according to the present invention;

[0029] Figure 5 This is an enlarged schematic diagram of part A of an outer rotor motor of the present invention;

[0030] Description of reference numerals: 100, rotor yoke; 200, magnetic conductive protrusion. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In Example 1, Figure 3As shown, the housing of an outer rotor motor of the present invention includes a rotor yoke 100 and a magnetic protrusion 200. The cross section of the rotor yoke 100 is annular. The magnetic protrusion 200 is a stamped part, which reduces the cost of manufacturing the magnetic protrusion 200. The surface of the magnetic protrusion 200 has an anti-rust layer, which helps to bond the magnetic protrusion 200 to the rotor yoke 100. An adhesive layer is provided between the magnetic protrusion 200 and the rotor yoke 100, so that multiple magnetic protrusions 200 are fixedly connected to the rotor yoke 100, and multiple magnetic protrusions 200 are along the inner wall surface of the rotor yoke 100. The rotor yoke 100 and the magnetic protrusion 200 are uniformly distributed circumferentially. The processing cost of the casing can be greatly reduced by first processing the rotor yoke 100 and the magnetic protrusion 200 separately and then bonding them. The magnetic protrusion 200 is made of magnetic low-carbon steel. The low-carbon steel has a high magnetic permeability and can provide magnetic resistance torque for the outer rotor motor, thereby improving the efficiency of the outer rotor motor, so that the outer rotor motor can more efficiently convert electrical energy and mechanical energy during operation. Compared with high-strength steel or stainless steel and other materials, low-carbon steel has a lower cost, which can effectively reduce the manufacturing cost of the outer rotor motor.

[0033] like Figure 4 As shown, surface A is the rear end surface of the magnetic protrusion 200, surfaces B and C are both side walls of the magnetic protrusion 200, and surface D is the front end surface of the magnetic protrusion 200; the rear end surface of the magnetic protrusion 200 is arc-shaped, and the diameter of the arc is the same as the diameter of the inner wall surface of the rotor yoke 100, the rear end surface of the magnetic protrusion 200 is connected to the inner wall surface of the rotor yoke 100, and the rear end surface of the magnetic protrusion 200 matches the inner wall surface of the stator yoke, which not only helps to combine the magnetic protrusion 200 with the rotor yoke 100, but also reduces the air gap between the magnetic protrusion 200 and the rotor yoke 100, so that the salient pole ratio of the outer rotor motor is improved, which helps to increase the magnetic resistance torque of the outer rotor motor, so that the outer rotor motor has a large torque output.

[0034] like Figure 4 、 5 As shown, a permanent magnet is arranged between two adjacent magnetic protrusions 200, and the two side walls of the magnetic protrusion 200 are arranged in parallel, so that the permanent magnet is mainly subjected to radial attraction x and radial repulsion y inside the outer rotor motor. The magnetic protrusions 200 on both sides of the permanent magnet can provide support for the permanent magnet, preventing the permanent magnet from being subjected to the radial attraction x and causing displacement of the permanent magnet.

[0035] In Example 2, the difference between this embodiment and Example 1 is that the anti-rust layer in this embodiment is a nickel-plated anti-rust layer. The nickel-plated anti-rust layer has a high hardness and can improve the wear resistance of the casing surface. The nickel-plated anti-rust layer has high stability and strong corrosion resistance in the air, and effectively protects the magnetic protrusion 200 from corrosion.

[0036] In Example 3, the difference between this embodiment and Examples 1 and 2 is that the anti-rust layer in this embodiment is a galvanized anti-rust layer, which can effectively prevent the magnetic protrusion 200 from rusting, thereby extending the service life of the outer rotor motor, and by nickel plating or zinc plating on the surface of the magnetic protrusion 200, it helps to bond the magnetic protrusion 200 to the rotor yoke 100.

[0037] In Example 4, the difference between this embodiment and Examples 1, 2, and 3 is that the magnetic protrusion 200 and the rotor yoke 100 in this embodiment are bonded using glue, so that the magnetic protrusion 200 and the rotor yoke 100 are tightly connected, which is beneficial to significantly reduce the processing cost of the casing.

[0038] First, a number of magnetic protrusions 200 are made by stamping, and the surface of the magnetic protrusions 200 is nickel-plated or zinc-plated. Finally, the rear end surface of the magnetic protrusion 200 is glued to the inner wall surface of the rotor yoke 100 with glue, so that the magnetic protrusions 200 are evenly distributed along the inner wall surface of the rotor yoke 100.

[0039] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0040] Obviously, the above embodiments are merely examples for clear explanation and are not limitations on the implementation methods. For ordinary technicians in the field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A housing of an outer rotor motor, characterized in that: The invention comprises a rotor yoke (100) and magnetic conductive protrusions (200), wherein the cross section of the rotor yoke (100) is annular; the magnetic conductive protrusions (200) are stamped parts; an adhesive layer is provided between the magnetic conductive protrusions (200) and the rotor yoke (100), so that a plurality of magnetic conductive protrusions (200) are fixedly connected to the rotor yoke (100), and the plurality of magnetic conductive protrusions (200) are uniformly distributed along the circumferential direction of the inner wall surface of the rotor yoke (100); the magnetic conductive protrusions (200) are made of magnetic conductive low-carbon steel; and the surface of the magnetic conductive protrusions (200) is provided with an anti-rust layer.

2. The outer rotor motor housing according to claim 1, wherein: The rear end surface of the magnetic conductive protrusion (200) is arc-shaped, and the diameter of the arc is the same as the diameter of the inner wall surface of the rotor yoke (100). The rear end surface of the magnetic conductive protrusion (200) is connected to the inner wall surface of the rotor yoke (100).

3. The outer rotor motor housing according to claim 1, wherein: The two sidewall surfaces of the magnetic conductive protrusion (200) are parallel to each other.

4. The outer rotor motor housing according to claim 1, wherein: The anti-rust layer is a nickel-plated anti-rust layer.

5. The outer rotor motor housing according to claim 1, wherein: The anti-rust layer is a galvanized anti-rust layer.

6. The outer rotor motor housing according to claim 1, wherein: The bonding layer is a glue layer, and the magnetic conductive protrusion (200) and the rotor yoke (100) are bonded by glue, so that the magnetic conductive protrusion (200) and the rotor yoke (100) are fixedly matched.

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