A brushless motor with a high stability rotor

Abstract

The present invention provides a brushless motor with a high-stability rotor, comprising a motor housing, a base, a stator assembly, an extrusion ring, an extrusion piece, a positioning cover and a rotor assembly, wherein the base is fixedly connected to one end of the motor housing, the positioning cover is fixedly connected to the other end of the motor housing, the stator assembly, the extrusion ring, the extrusion piece and the rotor assembly are arranged inside the motor housing, the motor housing comprises a housing body, a cooling groove, an inclined groove, an air duct and a positioning ring, the cooling groove and the air duct are both arranged inside the housing body, and the cooling groove frames the air duct inside, the inclined groove is arranged on one side of the side end face of the housing body, the positioning ring is fixedly connected to the inner wall of the housing body, the positioning cover comprises a positioning cover body, a fixing groove, a fixing assembly, a bearing and a fixing plate, the fixing plate is fixedly connected to the positioning cover body through the fixing assembly, the present invention effectively improves the stability of the brushless motor during operation, and at the same time, the motor has a good internal heat dissipation effect while satisfying the sealing effect.

Description

Technical Field

[0001] The invention relates to the technical field of brushless motors, in particular to a brushless motor with a high-stability rotor. Background Art

[0002] Brushless motor is a new type of motor. The working principle of brushless motor is opposite to that of traditional brushed motor. In brushless motor, the fixedly wound coil is used as the stator, and the permanent magnet is used as the rotor. The DC power is converted into a three-phase AC circuit by the control circuit and then transmitted to the coil. The coil can thus generate an alternating magnetic field, and the permanent magnet rotates in the magnetic field generated by the coil. Since the coil does not rotate, the brush as a conductive element is eliminated, so it is called a brushless motor. Compared with brushed motors, there is no relative friction between the stator and rotor of brushless motors, so the kinetic energy loss is small, the space occupied is small, and it has a broad application prospect in the field of high speed and high integration.

[0003] Many parts of existing brushless motors are generally fixed by glue, which is not reliable and can easily lead to poor stability of the motor. At the same time, a certain level of sealing is required inside the brushless motor, which leads to poor heat dissipation inside the motor. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a brushless motor with a high-stability rotor to solve the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the present invention is implemented through the following technical solutions: a brushless motor with a high-stability rotor, comprising a motor housing, a base, a stator assembly, an extrusion ring, an extrusion piece, a positioning cover and a rotor assembly, wherein the base is fixedly connected to one end of the motor housing, the positioning cover is fixedly connected to the other end of the motor housing, the stator assembly, the extrusion ring, the extrusion piece and the rotor assembly are arranged inside the motor housing, the motor housing comprises a housing body, a cooling groove, an inclined groove, an air duct and a positioning ring, the cooling groove and the air duct are both opened inside the housing body, and the cooling groove frames the air duct inside, the inclined groove is opened on one side of the side end surface of the housing body, and the positioning ring is fixedly connected to the inner wall of the housing body,

[0008] The positioning cover comprises a positioning cover body, a fixing groove, a fixing assembly, a bearing and a fixing plate, wherein the fixing plate is fixedly connected to the positioning cover body through the fixing assembly, and the fixing assembly comprises a threaded tube, an octagonal screw head and a threaded column, wherein the octagonal screw head is fixedly connected to one end of the threaded tube, and one end of the threaded column is fixedly connected to the inside of the threaded tube, the bearing is arranged inside the positioning cover body, and the fixing groove is arranged on the side end surface of the positioning cover body.

[0009] The rotor assembly comprises a magnetic core, a fixing ring, a fixing column and a main shaft. The fixing column is fixedly connected to the side end surface of the main shaft, and the magnetic core is fixed to the side end surface of the fixing column through the fixing ring.

[0010] As a further preference, the extrusion ring and the extrusion piece are located on a side adjacent to the stator assembly and the positioning cover inside the motor housing, and the extrusion ring is adjacent to the stator assembly, and the extrusion piece is adjacent to the positioning cover.

[0011] As a further preference, the cooling groove is filled with coolant, at least one group of the air ducts is evenly opened inside the shell body, one end of the air duct is connected to the inner cavity of the shell body, the other end of the air duct passes through the positioning ring and is connected to the inner cavity of the shell body, and a through groove is opened in the inner cavity of the extrusion part, and the through groove is connected to the end of the air duct away from the positioning ring.

[0012] As a further preference, the inclined slot and the fixed slot are both inclined slots, and are both inclined toward the wind direction of the base, the positioning cover is embedded in the motor housing, and the inclined slot and the fixed slot are positioned to match each other.

[0013] As a further preference, the motor housing and the positioning cover are fixed inside the inclined groove and the fixing groove by bolts.

[0014] As a further preference, one end of the stator assembly abuts against one side of the positioning ring, and the other end of the stator assembly is squeezed and fixed by the extrusion ring, the extrusion piece and the positioning cover when the positioning cover is installed inside the motor housing.

[0015] As a further preference, the lengths of the threaded tube and the threaded column are both smaller than the thickness of the positioning cover, the length of the threaded tube is smaller than the length of the threaded column, and the octagonal screw head is embedded on the side of the fixing plate away from the positioning cover body and is fixed in position.

[0016] As a further preference, the interface of the fixing column is a regular tetradecagon, there are fourteen groups of magnetic cores, and the fourteen groups of magnetic cores are respectively arranged on fourteen faces of the fixing column.

[0017] As a further preference, the fourteen groups of magnetic cores are arranged at intervals.

[0018] (III) Beneficial effects

[0019] The present invention provides a brushless motor with a high-stability rotor, which has the following beneficial effects:

[0020] 1. In the present invention, the positioning cover is embedded and fixed inside the motor housing by bolts, and the bolts are fixed at an angle, so that after the bolts are tightened, there is a large supporting force in the horizontal direction. The positioning cover is fixed to the motor housing and the stator assembly is squeezed and fixed by the extrusion ring and the extrusion piece. Through this double extrusion, the stator assembly can be completely fixed without shaking, thereby ensuring the stability of the motor. At the same time, the positioning cover body and the fixing plate on the positioning cover are fixed by the fixing assembly, so that the positioning cover body and the fixing plate are fixed and tightened, and the bearing is fixed and stable inside the positioning cover, thereby further ensuring the stability of the motor.

[0021] 2. The present invention provides fourteen groups of magnetic cores on the rotor assembly, and the magnetic cores are fixed by fixing rings. The cross-section of the fixing column is a regular tetragon, so that the magnetic cores are easy to install. At the same time, the rotor assembly will rotate when the motor is working. When the fourteen groups of magnetic cores rotate with the rotor assembly, centrifugal force will be generated to suck the gas on one side of the rotor assembly into the other side. The edges on the fixing column play a good guiding role, which can accelerate the cooling of the rotor assembly. The temperature of the gas after the rotor assembly is cooled will increase. The rotor assembly is connected on both sides inside the motor housing through an air duct, so that the gas with increased temperature will enter one side of the rotor assembly through the air duct. At the same time, the gas in the air duct will be cooled by the coolant inside the cooling tank, so that a motor gas cooling cycle is formed inside the motor, so that the motor itself has an excellent cooling effect when it is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a brushless motor with a high-stability rotor according to the present invention;

[0023] Figure 2 It is a schematic cross-sectional view of the brushless motor with a high-stability rotor of the present invention;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the motor housing of the present invention;

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the positioning cover of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the fixing assembly of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the rotor assembly of the present invention.

[0028] In the figure: 1 motor housing, 2 base, 3 stator assembly, 4 extrusion ring, 5 extrusion part, 6 positioning cover, 7 rotor assembly, 8 housing body, 9 cooling groove, 10 inclined groove, 11 air duct, 12 positioning ring, 13 positioning cover body, 14 fixing groove, 15 fixing assembly, 16 bearing, 17 fixing plate, 18 threaded tube, 19 octagonal screw head, 20 threaded column, 21 magnetic core, 22 fixing ring, 23 fixing column, 24 main shaft. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] 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" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0034] The embodiment of the present invention provides a brushless motor with a high-stability rotor, including a motor housing 1, a base 2, a stator assembly 3, an extrusion ring 4, an extrusion piece 5, a positioning cover 6 and a rotor assembly 7. The base 2 is fixedly connected to one end of the motor housing 1, and the positioning cover 6 is fixedly connected to the other end of the motor housing 1. The stator assembly 3, the extrusion ring 4, the extrusion piece 5 and the rotor assembly 7 are arranged inside the motor housing 1. The motor housing 1 includes a housing body 8, a cooling groove 9, an inclined groove 10, an air duct 11 and a positioning ring 12. The cooling groove 9 and the air duct 11 are both opened inside the housing body 8, and the cooling groove 9 frames the air duct 11 inside. The inclined groove 10 is opened on one side of the side end surface of the housing body 8, and the positioning ring 12 is fixedly connected to the inner wall of the housing body 8.

[0035] The positioning cover 6 includes a positioning cover body 13, a fixing groove 14, a fixing assembly 15, a bearing 16 and a fixing plate 17. The fixing plate 17 is fixedly connected to the positioning cover body 13 through the fixing assembly 15. The fixing assembly 15 includes a threaded tube 18, an octagonal screw head 19 and a threaded column 20. The octagonal screw head 19 is fixedly connected to one end of the threaded tube 18. One end of the threaded column 20 is fixedly connected to the inside of the threaded tube 18. The bearing 16 is arranged inside the positioning cover body 13. The fixing groove 14 is provided on the side end surface of the positioning cover body 13.

[0036] The rotor assembly 7 includes a magnetic core 21 , a fixing ring 22 , a fixing column 23 and a main shaft 24 . The fixing column 23 is fixedly connected to a side end surface of the main shaft 24 , and the magnetic core 21 is fixed to a side end surface of the fixing column 23 through the fixing ring 22 .

[0037] The motor of this embodiment is assembled from a motor housing 1 , a base 2 , a stator assembly 3 , an extrusion ring 4 , an extrusion piece 5 , a positioning cover 6 and a rotor assembly 7 .

[0038] In this embodiment, the extrusion ring 4 and the extrusion piece 5 are located on a side adjacent to the stator assembly 3 and the positioning cover 6 inside the motor housing 1 , and the extrusion ring 4 is adjacent to the stator assembly 3 , and the extrusion piece 5 is adjacent to the positioning cover 6 .

[0039] like Figure 1-3 As shown, the cooling groove 9 is filled with coolant, and the interior of the positioning ring 12 can be cooled by the coolant in the cooling groove 9. At least one group of air ducts 11 is evenly opened in the shell body 8. One end of the air duct 11 is connected to the inner cavity of the shell body 8, and the other end of the air duct 11 passes through the positioning ring 12 and is connected to the inner cavity of the shell body 8. A through groove is opened in the inner cavity of the extruded part 5, and the through groove is connected to the end of the air duct 11 away from the positioning ring 12. The flow channel of the air duct 11 can enable the gas on both sides of the stator assembly 3 to exchange.

[0040] In this embodiment, the inclined groove 10 and the fixed groove 14 are both inclined grooves, and are both inclined toward the wind direction of the base 2. The positioning cover 6 is embedded in the motor housing 1, and the positions of the inclined groove 10 and the fixed groove 14 are adapted. The motor housing 1 and the positioning cover 6 are fixed inside the inclined groove 10 and the fixed groove 14 by bolts.

[0041] When the positioning cover 6 is fixedly connected to the motor housing 1 , the positioning cover 6 is completely embedded in the motor housing 1 by continuously tightening the bolts.

[0042] Specifically, one end of the stator assembly 3 is against one side of the positioning ring 12, and the other end of the stator assembly 3 is squeezed and fixed by the extrusion ring 4, the extrusion piece 5 and the positioning cover 6 when the positioning cover 6 is installed inside the motor housing 1. The positioning cover 6 provides an axial extrusion force to the extrusion piece 5 when embedded in the motor housing 1. Under the action of the extrusion ring 4, the extrusion piece 5 and the positioning cover 6, the position of the stator assembly 3 is completely fixed to ensure that the stator assembly 3 does not shake when the motor is working.

[0043] In this embodiment, the lengths of the threaded tube 18 and the threaded column 20 are both smaller than the thickness of the positioning cover 6, the length of the threaded tube 18 is smaller than the length of the threaded column 20, the octagonal screw head 19 is embedded in the side of the fixing plate 17 away from the positioning cover body 13, and the position is fixed, and a group of plum screw heads are fixedly connected to the other end of the threaded column 20. When the threaded column 20 is tightened by the plum screw head, the threaded column 20 will continue to extend into the threaded tube 18, and then the distance between the octagonal screw head 19 and the plum screw head will gradually decrease, so that the position of the bearing 16 is completely fixed, so that the bearing 16 does not shake when the motor is working.

[0044] In this embodiment, the cross-section of the fixing column 23 is a regular tetradecagon, there are fourteen groups of magnetic cores 21, and the fourteen groups of magnetic cores 21 are respectively arranged on fourteen faces of the fixing column 23. The fourteen groups of magnetic cores 21 are arranged at intervals, and the fixing column 23 makes the installation of the fourteen groups of magnetic cores 21 more convenient.

[0045] Among them, when the rotor assembly 7 rotates, the fourteen groups of magnetic cores 21 will generate centrifugal force to cause the gas on one side of the rotor assembly 7 to be sucked into the other side. The edges on the fixed column 23 play a good guiding role, which can accelerate the cooling of the rotor assembly 7. The temperature of the gas after the rotor assembly 7 is cooled will increase. The gas with increased temperature will enter one side of the rotor assembly 7 through the air duct 11. At the same time, the gas in the air duct 11 will be cooled by the coolant inside the cooling tank 9, so that a motor gas cooling cycle is formed inside the motor, which makes the motor have an excellent cooling effect.

[0046] Working principle: the positioning cover 6 is embedded and fixed on one side of the motor housing 1 by bolts, and the bolts are tilted to fix the positioning cover 6 and the motor housing 1, so that the bolts provide a horizontal component force to the positioning cover 6. Through this horizontal component force, the extrusion ring 4 and the extrusion piece 5 work together to completely fix the position of the stator assembly 3, ensuring that the stator assembly 3 will not shake, thereby making the motor work stably. At the same time, the fixing assembly 15 is continuously tightened to fix the position of the bearing 16 between the positioning cover body 13 and the fixing plate 17, further ensuring the stability of the motor. The rotor assembly 7 is fixed with fourteen groups of magnetic cores 21 through the fixing ring 22. At the same time, the rotor assembly 7 is connected on both sides of the motor housing 1 through the air duct 11. When the rotor assembly 7 rotates, the fourteen groups of magnetic cores 21 will transfer the gas on one side of the rotor assembly 7 to the other side. The gas cools the rotor assembly 7 through the gap between the fourteen groups of magnetic cores 21, and then flows back through the air duct 11. The cooling groove 9 cools the gas, so that the inside of the motor can self-cool for a long time.

[0047] In summary, the present invention provides a brushless motor with a high-stability rotor, which is fixed in the motor housing 1 by bolts embedded in the positioning cover 6, and the bolts are fixed at an angle, so that after the bolts are tightened, there is a large supporting force in the horizontal direction. The positioning cover 6 is fixed to the motor housing 1 and the stator assembly 3 is squeezed and fixed by the extrusion ring 4 and the extrusion piece 5. Through this double extrusion, the stator assembly 3 is completely fixed without shaking, thereby ensuring the stability of the motor. At the same time, the positioning cover body 13 and the fixing plate 17 on the positioning cover 6 are fixed by the fixing assembly 15, so that the positioning cover body 13 and the fixing plate 17 are fixed and tightened, and the bearing 16 is fixed and stably inside the positioning cover 6, thereby further ensuring the stability of the motor.

[0048] Secondly, fourteen groups of magnetic cores 21 are arranged on the rotor assembly 7, and the magnetic cores 21 are fixed by fixing rings 22, and the cross-section of the fixing column 23 is a regular tetragon, so that the magnetic cores 21 are easy to install. At the same time, the rotor assembly 7 will rotate when the motor is working. When the fourteen groups of magnetic cores 21 rotate with the rotor assembly 7, centrifugal force will be generated to suck the gas on one side of the rotor assembly 7 into the other side. The edges on the fixing column 23 play a good guiding role, which can accelerate the cooling of the rotor assembly 7. The temperature of the gas after the rotor assembly 7 is cooled will increase, and the rotor assembly 7 is connected on both sides inside the motor housing 1 through the air duct 11, so that the gas with increased temperature will enter one side of the rotor assembly 7 through the air duct 11, and at the same time, the gas in the air duct 11 will be cooled by the coolant inside the cooling tank 9, so that a motor gas cooling cycle is formed inside the motor, so that the motor itself has an excellent cooling effect when it is working.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A brushless motor with a high-stability rotor, comprising a motor housing (1), a base (2), a stator assembly (3), an extrusion ring (4), an extrusion piece (5), a positioning cover (6) and a rotor assembly (7), characterized in that: The base (2) is fixedly connected to one end of the motor housing (1), the positioning cover (6) is fixedly connected to the other end of the motor housing (1), the stator assembly (3), the extrusion ring (4), the extrusion piece (5) and the rotor assembly (7) are arranged inside the motor housing (1), the motor housing (1) comprises a housing body (8), a cooling groove (9), an inclined groove (10), an air duct (11) and a positioning ring (12), the cooling groove (9) and the air duct (11) are both opened inside the housing body (8), and the cooling groove (9) frames the air duct (11) inside, the inclined groove (10) is opened on one side of the side end surface of the housing body (8), and the positioning ring (12) is fixedly connected to the inner wall of the housing body (8), The positioning cover (6) comprises a positioning cover body (13), a fixing groove (14), a fixing assembly (15), a bearing (16) and a fixing plate (17); the fixing plate (17) is fixedly connected to the positioning cover body (13) via the fixing assembly (15); the fixing assembly (15) comprises a threaded tube (18), an octagonal screw head (19) and a threaded column (20); the octagonal screw head (19) is fixedly connected to one end of the threaded tube (18); one end of the threaded column (20) is fixedly connected to the inside of the threaded tube (18); the bearing (16) is arranged inside the positioning cover body (13); the fixing groove (14) is provided on a side end surface of the positioning cover body (13); The rotor assembly (7) comprises a magnetic core (21), a fixing ring (22), a fixing column (23) and a main shaft (24); the fixing column (23) is fixedly connected to a side end surface of the main shaft (24); and the magnetic core (21) is fixed to a side end surface of the fixing column (23) via the fixing ring (22); The extrusion ring (4) and the extrusion piece (5) are located inside the motor housing (1) on a side adjacent to the stator assembly (3) and the positioning cover (6), and the extrusion ring (4) is adjacent to the stator assembly (3), and the extrusion piece (5) is adjacent to the positioning cover (6); The cooling groove (9) is filled with a coolant, at least one group of the air ducts (11) is evenly arranged inside the shell body (8), one end of the air duct (11) is connected to the inner cavity of the shell body (8), the other end of the air duct (11) passes through the positioning ring (12) and is connected to the inner cavity of the shell body (8), the inner cavity of the extrusion piece (5) is provided with a through groove, and the through groove is connected to the end of the air duct (11) away from the positioning ring (12); The inclined groove (10) and the fixed groove (14) are both inclined grooves, and are both inclined towards the wind direction of the base (2); the positioning cover (6) is embedded in the motor housing (1), and the inclined groove (10) and the fixed groove (14) are adapted in position.

2. A brushless motor with a high stability rotor according to claim 1, characterized in that: The motor housing (1) and the positioning cover (6) are fixed inside the inclined groove (10) and the fixing groove (14) by means of bolts.

3. A brushless motor with a high stability rotor according to claim 2, characterized in that: One end of the stator assembly (3) abuts against one side of the positioning ring (12), and the other end of the stator assembly (3) is squeezed and fixed by the extrusion ring (4), the extrusion piece (5) and the positioning cover (6) when the positioning cover (6) is installed inside the motor housing (1).

4. A brushless motor with a high stability rotor according to claim 1, characterized in that: The lengths of the threaded tube (18) and the threaded column (20) are both less than the thickness of the positioning cover (6), the length of the threaded tube (18) is less than the length of the threaded column (20), and the octagonal screw head (19) is embedded on a side of the fixing plate (17) away from the positioning cover body (13) and is fixed in position.

5. A brushless motor with a high stability rotor according to claim 1, characterized in that: The interface of the fixing column (23) is a regular tetradecagon, the magnetic cores (21) are fourteen groups in total, and the fourteen groups of magnetic cores (21) are respectively arranged on fourteen faces of the fixing column (23).

6. A brushless motor with a high stability rotor according to claim 5, characterized in that: The fourteen groups of magnetic cores (21) are arranged at intervals.

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