A structure for increasing motor cogging torque and motor

Abstract

The utility model provides a structure and a motor for increasing the motor tooth slot torque to solve the problem that the resistance device is added to the output shaft end of the motor in the prior art to increase the torque, which leads to a complicated structure of the whole machine, increased cost and reduced reliability. The structure includes a magnet and a punching plate. The magnets are n, n is an integer greater than or equal to 2; the n magnets are evenly arranged in a circular manner and form n gaps. The punching plate has m tooth shoes, m is an integer greater than or equal to 2 and m≥n; at least one side of the outer surface of the n tooth shoes has an arc groove in the arc length direction. When the magnet and the punching plate are in a relatively static state, each gap corresponds to one arc groove. The motor has the above structure. The utility model improves the punching plate structure and adds the design of the arc groove, which can increase the tooth slot torque and realize the self-locking function of the motor, with lower cost and more reliable performance.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a structure for increasing motor cogging torque and a motor. Background Art

[0002] With the development and maturity of automotive electronic technology, automobiles are gradually moving towards comfort and intelligence. Electric tailgates have become a technology used and promoted by various OEMs in the process of automobile product design, production and sales.

[0003] The tailgate motor is generally a permanent magnet DC brushed motor, which provides driving force for the tailgate support rod system of the car through the planetary gear structure connected to it. It is often used in the trunk opening mechanism, gull-wing door opening mechanism and side door opening mechanism of the car. Figure 1 ~Attached Figure 3 As shown in FIG. 1 , the motor includes a housing assembly 10, an end cover assembly 20 and a rotor assembly 30. There are two N-pole magnet tiles and two S-pole magnet tiles inside the housing assembly 10. The N-pole magnet tiles and the S-pole magnet tiles are alternately distributed in 360° evenly divided positions on the inner circle of the housing assembly 10. At the same time, the outer arc surface of each N-pole magnet tile and the S-pole magnet tile does not overlap with the arc surface center of the inner arc surface, and there is a certain distance (for example, 0.65 mm), as shown in the attached Figure 4 . The end cover assembly 20 is arranged at the open end of the casing assembly 10. The rotor assembly 30 is arranged inside the casing assembly 10. There is a uniform gap between the outer arc surface of the punching sheet 31 of the rotor assembly 30 and the inner arc surface of the N-pole magnetic tile and the S-pole magnetic tile. When the existing conventional motor is stopped, its maximum tooth groove torque is relatively small. After the trunk and gull-wing door of the car are opened, it will be affected by its own gravity, generating a downward force and cannot remain stationary. In addition, when the car is parked on a sloping road, the side door will also be affected by gravity after opening, generating lateral force, and it is also unable to remain stationary. Therefore, the existing solution is to add a resistance device to the output shaft end of the existing motor to achieve the function of maintaining stillness, which makes the entire mechanism more complicated, the cost is relatively high, and the reliability is reduced. Utility Model Content

[0004] The utility model provides a structure and a motor for increasing the cogging torque of a motor to solve the problem that the prior art increases the torque by adding a resistance device at the output shaft end of the motor, which results in a complex structure of the whole machine, increases the cost, and reduces the reliability. The utility model improves the punch plate structure and adds the design of the arc groove, which can increase the cogging torque and realize the self-locking function of the motor, with lower cost and more reliable performance.

[0005] The technical solution adopted by the utility model is:

[0006] A structure for increasing the cogging torque of a motor, comprising:

[0007] Magnets, wherein the number of the magnets is n, where n is an integer greater than or equal to 2; the n magnets are evenly arranged in a circular manner and form n gaps;

[0008] A punching sheet, wherein the punching sheet has m tooth shoes, m is an integer greater than or equal to 2 and m≥n; at least one side of the outer surface of the n tooth shoes has an arc groove in the arc length direction;

[0009] Wherein, when the magnet and the punching sheet are in a relatively static state, each of the gaps corresponds to one of the arc grooves.

[0010] Furthermore, the cross section of the magnet is fan-shaped, and the centers of the arc surfaces of the inner arc wall and the outer arc wall coincide with each other; n magnets together form a cylindrical structure.

[0011] Furthermore, the arc length of the top of the circular arc groove is less than or equal to 1 / 2 of the arc length of the outer surface of the tooth shoe.

[0012] Furthermore, a protrusion is formed on the arc-shaped groove bottom of the arc groove along the axial center direction of the punching sheet.

[0013] Furthermore, the maximum distance between the outer surface of the protrusion and the arc-shaped groove bottom of the arc groove is the groove depth of the arc groove.

[0014] Furthermore, the cross section of the protrusion is rectangular, triangular, semicircular or trapezoidal.

[0015] Furthermore, the other side of the arc length direction of the tooth shoe provided with the circular arc groove has a cutting edge;

[0016] And / or, the tooth shoe without the circular arc groove has symmetrical cutting edges on both sides of the arc length direction.

[0017] Furthermore, the cutting edge is in a straight line form or an inwardly concave arc form.

[0018] Based on the same inventive concept, the utility model also provides a motor, comprising:

[0019] a housing assembly, the housing assembly having a magnet;

[0020] an end cover assembly, the end cover assembly being disposed at an open end of the housing assembly;

[0021] A rotor assembly, wherein the rotor assembly is disposed in a combined structure of the housing assembly and the end cover assembly; the assembly comprises a punching sheet;

[0022] The magnet and the punching sheet are combined to form the aforementioned structure for increasing the motor cogging torque.

[0023] The beneficial effects of the utility model are:

[0024] 1. The utility model designs a structure for increasing the tooth slot torque of a motor, and the structure includes a magnet and a punching plate. The outer surface of some tooth shoes of the punching plate is provided with an arc groove. When the punching plate stops rotating (that is, when the rotor assembly is in a stationary state), a circular arc groove faces a gap formed by two adjacent magnets. When the rotor assembly switches from a stationary state to a rotating state, and then from a rotating state to a stationary state, the tooth slot torque is increased due to the design of the arc groove in the combined structure of the punching plate and the magnet, and a self-locking function can be achieved. Compared with the method of increasing the motor torque by using an external resistance device, the utility model makes adjustments to the structure of the punching plate itself, which is lower in cost and more reliable in performance.

[0025] 2. The improved motor in the utility model can realize the self-locking function when applied to the trunk opening mechanism, gull-wing door opening mechanism and side door opening mechanism. Compared with the method of setting a resistance device at the output shaft end of the motor, the improved motor structure has higher reliability and can also reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of a motor in the prior art.

[0028] Figure 2 for Figure 1 AA section view.

[0029] Figure 3 It is a schematic diagram of the end face direction of the punching sheet in the prior art.

[0030] Figure 4 It is a schematic diagram of magnetic tiles in the prior art.

[0031] Figure 5 Schematic diagram of the structure of the magnet in Example 1.

[0032] Figure 6 Schematic diagram of the structure of the punching sheet in Example 1.

[0033] Figure 7 Schematic diagram of the internal structure of the motor in Example 1.

[0034] Figure 8 It is a schematic diagram of the structure of the punching sheet in Example 2.

[0035] Fig. 9 This is a schematic diagram of the internal structure of the motor in Example 2. DETAILED DESCRIPTION

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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 referred device or element 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.

[0037] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0038] The embodiments of the utility model are described in detail below with reference to the accompanying drawings. Example

[0039] In the prior art, in order to increase the torque, a resistance device is added to the output shaft end of the motor, which leads to the problem of complex structure of the whole machine, increased cost and reduced reliability. This embodiment provides a structure for increasing the cogging torque of the motor. The structure for increasing the cogging torque of the motor includes a punching sheet 31 as a component of the rotor assembly and a plurality of magnets 11 as a component of the housing assembly. Among them, the plurality of magnets 11 are evenly distributed on the outside of the punching sheet 31 in a circular manner.

[0040] Specifically, as attached Figure 5 As shown, the cross section of the magnet 11 is fan-shaped, and the arc surfaces of the inner arc wall and the outer arc wall of the magnet 11 coincide with each other. The four magnets 11 are evenly distributed in a circular manner and enclose a cylindrical structure. At the same time, four gaps 111 are formed between the four magnets 11.

[0041] As attached Figure 7 As shown, the punching sheet 31 is located in the cylindrical structure surrounded by four magnets 11, and the axial centers of the two coincide with each other. Figure 6As shown, the punching piece 31 has six tooth shoes 311. Among them, two adjacent tooth shoes 311 in the four tooth shoes 311 form a group, and two groups of tooth shoes 311 are separated by the remaining two tooth shoes 311. The outer surfaces of the two tooth shoes 311 in the same group have symmetrical arc grooves 3111 on one side of the arc length direction away from each other. The arc-shaped bottom of the arc groove 3111 is closer to the center of the punching piece 301 than the rest of the outer surface of the tooth shoe 311, thereby forming a step-like structure on the outer surface of the tooth shoe 311. The outer surfaces of the two tooth shoes 311 that serve to separate the two groups of tooth shoes 311 still maintain an arc shape. As shown in the attached Figure 7 As shown, in the structure of the combination of the punching sheet 31 and the magnet 11, when the punching sheet 31 stops rotating (that is, when the rotor assembly is in a stationary state), the four arc grooves 3111 face the four gaps 111 formed by the four magnets 11 respectively, that is, one gap 111 formed by two adjacent magnets 11 corresponds to one arc groove 3111. Since the arc length of the tooth shoe 31 can be adjusted according to demand, when the arc groove 3111 faces the gap 111, the entire arc groove 3111 can face the gap 111, or a part of the arc groove 3111 can face the gap 111. When the rotor assembly switches from a stationary state to a rotating state, and then switches from a rotating state to a stationary state, the design of the arc groove 3111 in the combined structure of the punching sheet 31 and the magnet 11 is equivalent to changing the distance between the tooth shoe and the magnet, increasing the tooth slot torque, and realizing the self-locking function. Compared with the method of increasing the motor torque by using an external resistance device, the present embodiment makes improvements on the structure of the punching sheet itself, which is lower in cost and more reliable in performance.

[0042] Furthermore, in this embodiment, a protrusion 3112 is formed on the bottom of the arc groove 3111 along the axial center direction of the punching sheet 31. The protrusion 3112 divides the arc groove 3111 into two discontinuous parts. The cross section of the protrusion 3112 is roughly rectangular, semicircular, triangular, trapezoidal, etc., and the maximum distance between the outer surface of the protrusion 3112 and the arc groove of the arc groove 3111 is the groove depth of the arc groove 3111. Figure 6 As shown, the cross section of the protrusion 3112 is rectangular, and the distance between the outer surface of the protrusion 3112 and the arc groove of the arc groove 3111 is 1 / 2 of the groove depth of the arc groove 3111. In this embodiment, the tooth torque is further increased by designing the protrusion 3112.

[0043] Furthermore, in this embodiment, the arc length of the top of the circular arc groove 3111 is less than or equal to 1 / 2 of the arc length of the outer surface of the tooth shoe 311 .

[0044] Furthermore, in this embodiment, the outer surfaces of the two tooth shoes 311 that separate the two groups of tooth shoes 311 can also be improved so that both sides have symmetrical cutting edges 3113. The cutting edges 3113 are in the form of straight lines or in the form of concave arcs, as shown in the attached Figure 6 As shown, when the rotor assembly is in a stationary state, the two tooth shoes 311 that separate the two groups of tooth shoes 311 will face the magnet 11. That is, when the rotor assembly is in a stationary state, each tooth shoe 311 facing the magnet 11 has symmetrical cut edges on both sides. In this embodiment, the tooth torque can be further increased by designing the cut edges 3113.

[0045] When the above-mentioned structure for increasing the motor cogging torque is applied to the existing motor structure, an improved motor is obtained. The motor also includes a housing assembly 10, an end cover assembly 20 and a rotor assembly 30. Among them, the housing assembly has the aforementioned magnet 11. The end cover assembly 20 is arranged at the open end of the housing assembly 10. The drill rotor assembly 30 has the aforementioned punching sheet 31. The rotor assembly 31 is located in the combined structure of the housing assembly 10 and the end cover assembly 20. The magnet 11 and the punching sheet 31 are combined to form a structure for increasing the motor cogging torque. After testing, the cogging torque trough value and the cogging torque peak value of the motor are significantly increased.

[0046] When the improved motor is applied to the trunk opening mechanism, gull-wing door opening mechanism and side door opening mechanism, the self-locking function can be realized. Compared with the method of setting a resistance device at the output shaft end of the motor, the improved motor structure has higher reliability and can also reduce manufacturing costs. Example

[0047] This embodiment provides a structure for increasing the motor cogging torque. The structure for increasing the motor cogging torque includes a punching sheet 31 as a component of a rotor assembly and a plurality of magnets 11 as a component of a housing assembly. The plurality of magnets 11 are evenly distributed on the outside of the punching sheet 31 in a circular manner.

[0048] Specifically, the cross section of the magnet 11 is fan-shaped, and the arc surfaces of the inner arc wall and the outer arc wall of the magnet 11 coincide with each other. The four magnets 11 are evenly distributed in a circle and enclose a cylindrical structure. At the same time, four gaps 111 are formed between the four magnets 11.

[0049] As attached Figure 8As shown, the punching sheet 31 has ten tooth shoes 311. Among the ten tooth shoes 311, four adjacent tooth shoes 311 form a group, and two groups of tooth shoes 311 are separated by the remaining two tooth shoes 311. The outer surfaces of the two tooth shoes 311 that are farthest from each other in the four tooth shoes 311 of the same group have symmetrical arc grooves 3111 on one side of the arc length direction that is close to each other. The arc-shaped groove bottom of the arc groove 3111 is closer to the center of the punching sheet 301 than the rest of the outer surface of the tooth shoe 311, thereby forming a step-like structure on the outer surface of the tooth shoe 311. The outer surfaces of the two tooth shoes 311 that serve to separate the two groups of tooth shoes 311 maintain an arc shape. A protrusion 3112 is formed on the arc-shaped groove bottom of the arc groove 3111 along the axial center direction of the punching sheet 31. The protrusion 3112 separates the arc groove 3111 into two discontinuous parts. The cross section of the protrusion 3112 is roughly rectangular, and the distance between the outer surface of the protrusion 3112 and the arc groove of the arc groove 3111 is 1 / 2 of the groove depth of the arc groove 3111. The outer surfaces of the two tooth shoes 311 that separate the two groups of tooth shoes 311, as well as the outer surfaces of the remaining two tooth shoes 311 in the same group, still maintain a complete arc shape. Fig. 9 As shown, in the structure of the combination of the punching sheet 31 and the magnet 11, when the punching sheet 31 stops rotating (that is, when the rotor assembly is in a stationary state), the four arc grooves 3111 face the four gaps 111 formed by the four magnets 11 respectively, and one gap 111 formed by two adjacent magnets 11 corresponds to one arc groove 3111. When the rotor assembly switches from a stationary state to a rotating state, and then switches from a rotating state to a stationary state, the design of the arc groove 3111 in the combined structure of the punching sheet 31 and the magnet 11 is equivalent to changing the distance between the tooth shoe and the magnet, increasing the tooth groove torque, and realizing the self-locking function. Compared with the method of increasing the motor torque by using an external resistance device, the present embodiment makes improvements on the structure of the punching sheet itself, which is lower in cost and more reliable in performance.

[0050] When the above structure for increasing the motor cogging torque is applied to the existing motor structure, an improved motor is obtained. The motor also includes a housing assembly 10, an end cover assembly 20 and a rotor assembly 30. The housing assembly has the aforementioned magnet 11. The end cover assembly 20 is arranged at the open end of the housing assembly 10. The drill rotor assembly 30 has the aforementioned punching sheet 31. The rotor assembly 31 is located in the combined structure of the housing assembly 10 and the end cover assembly 20. The magnet 11 and the punching sheet 31 are combined to form a structure for increasing the motor cogging torque.

[0051] When the improved motor is applied to the trunk opening mechanism, gull-wing door opening mechanism and side door opening mechanism, the self-locking function can be realized. Compared with the method of setting a resistance device at the output shaft end of the motor, the improved motor structure has higher reliability and can also reduce manufacturing costs.

Claims

1. A structure for increasing the cogging torque of a motor, characterized in that: include: Magnets, wherein the number of the magnets is n, where n is an integer greater than or equal to 2; the n magnets are evenly arranged in a circular manner and form n gaps; A punching sheet, wherein the punching sheet has m tooth shoes, m is an integer greater than or equal to 2 and m≥n; at least one side of the outer surface of the n tooth shoes has an arc groove in the arc length direction; Wherein, when the magnet and the punching sheet are in a relatively static state, each of the gaps corresponds to one of the arc grooves.

2. The structure for increasing the motor cogging torque according to claim 1, characterized in that: The cross section of the magnet is fan-shaped, and the centers of the arc surfaces of the inner arc wall and the outer arc wall coincide with each other; n magnets are surrounded to form a cylindrical structure.

3. The structure for increasing the motor cogging torque according to claim 1, characterized in that: The arc length of the top of the circular arc groove is less than or equal to 1 / 2 of the arc length of the outer surface of the tooth shoe.

4. The structure for increasing the motor cogging torque according to claim 2, characterized in that: A protrusion is formed on the arc-shaped groove bottom of the arc groove along the axial center direction of the punching sheet.

5. The structure for increasing the motor cogging torque according to claim 4, characterized in that: The maximum distance between the outer surface of the protrusion and the arc-shaped groove bottom of the arc groove is the groove depth of the arc groove.

6. The structure for increasing the motor cogging torque according to claim 4, characterized in that: The cross section of the protrusion is rectangular, triangular, semicircular or trapezoidal.

7. The structure for increasing the motor cogging torque according to any one of claims 1 to 6, characterized in that: The tooth shoe provided with the circular arc groove has a cutting edge on the other side in the arc length direction; And / or, the tooth shoe without the circular arc groove has symmetrical cutting edges on both sides of the arc length direction.

8. The structure for increasing the motor cogging torque according to claim 7, characterized in that: The cutting edge is in a straight line form or an inwardly concave arc form.

9. A motor, characterized in that include: a housing assembly, the housing assembly having a magnet; an end cover assembly, the end cover assembly being disposed at an open end of the housing assembly; A rotor assembly, wherein the rotor assembly is disposed in a combined structure of the housing assembly and the end cover assembly; the assembly comprises a punching sheet; The magnet and the punching sheet are combined to form a structure for increasing the motor cogging torque as described in any one of claims 1 to 8.

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