Direct-current brushless motor

Abstract

According to the direct-current brushless motor provided by the invention, the rotor assembly is arranged in the stator assembly, the magnetic ring is fixed on the motor shell, the rotor assembly rotates in the magnetic ring, and the magnetic ring is arranged outside, so that higher magnetic field intensity can be obtained, the output torque is larger, the efficiency is higher, the motor shell is of a fixed structure and does not rotate along with the rotation of the rotor assembly, and the reliability of the motor is improved. The direct current brushless motor not only has the structural characteristic of convenient installation of an inner rotor brushless motor, but also has the performance characteristic of large output torque of an outer rotor brushless motor. Compared with a traditional inner rotor brushless motor, the inner rotor brushless motor has the advantages of higher output power, high torque, high efficiency and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct current brushless motor, and particularly relates to a direct current brushless motor. BACKGROUND

[0002] The direct current brushless motor (BLDC) is a kind of synchronous motor, which uses a direct current (DC) power supply, adjusts the current direction and rotation speed through an electronic commutator, has the characteristics of high efficiency, low noise and high precision, and is widely used in electric vehicles, electric tools, industrial automation and other fields.

[0003] The existing direct current brushless motor is divided into an inner rotor brushless motor or an outer rotor brushless motor. The rotor and the magnetic steel of the outer rotor brushless motor can be set to have a larger outer diameter, a higher magnetic field strength and a larger output torque. The outer rotor brushless motor has an external fixed structure, which is convenient for installing other mechanisms. The existing direct current brushless motor cannot have the characteristics of the outer rotor motor and the inner rotor brushless motor, and has poor practical effect. CONTENT OF THE INVENTION

[0004] The present application solves the technical problem that the existing direct current brushless motor is divided into an inner rotor brushless motor or an outer rotor brushless motor. The rotor and the magnetic steel of the outer rotor brushless motor can be set to have a larger outer diameter, a higher magnetic field strength and a larger output torque. The outer rotor brushless motor has an external fixed structure, which is convenient for installing other mechanisms. The existing direct current brushless motor cannot have the characteristics of the outer rotor motor and the inner rotor brushless motor, and has poor practical effect.

[0005] In order to solve the above problems, in order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a direct current brushless motor.

[0006] The utility model discloses a direct current brushless motor, it includes first end cover, rotor assembly, stator assembly, the rotor assembly with the stator assembly is connected,

[0007] The stator assembly includes a shell and a magnetic ring, the central axis of the magnetic ring is in the same straight line with the central axis of the shell, and the shell is sleeved outside the magnetic ring.

[0008] The shell is connected with the first end cover, the shell is sleeved outside the magnetic ring, the magnetic ring is sleeved outside the rotor assembly, and the rotating shaft of the rotor assembly extends outside through the shell.

[0009] Preferably, the end cover assembly and the position control assembly are included, and the end cover assembly and the position control assembly are arranged on the first end cover.

[0010] The end cover assembly is connected with the rotor assembly, and the position control assembly is connected with the end cover assembly.

[0011] Preferably, the position control assembly comprises a Hall sensor, an induction magnetic ring, a three-phase connecting line, a circuit board;

[0012] The induction magnetic ring is connected with the rotor assembly, the Hall sensor is integrated on the circuit board, the three-phase connecting line is connected with the circuit board, and the three-phase connecting line provides a three-phase power supply.

[0013] Preferably, the end cover assembly comprises three ball bearings and an insulating gasket, the three ball bearings are stacked in sequence, and the insulating gasket is arranged between adjacent two ball bearings.

[0014] Preferably, the position control assembly comprises three connecting terminals and an end cover support, the circuit board is fixedly connected with the end cover support, the connecting terminals are connected with the end cover support, the end cover support is connected with the first end cover, and the ball bearings and the connecting terminals are connected with the first end cover through the end cover support;

[0015] The three connecting terminals are connected with the three-phase connecting line, and one connecting terminal is connected with one ball bearing.

[0016] Preferably, the rotor assembly comprises a rotating shaft, a rotor core, a winding coil and a through ring.

[0017] The rotor core is centrally symmetrically arranged, the winding coil is connected with the rotor core, the rotating shaft penetrates the central axis of the rotor core, and the through ring is connected with the rotating shaft.

[0018] The rotor core is installed at the middle part of the rotating shaft, the through ring is installed at one end of the rotating shaft, and the other end of the rotating shaft penetrates the casing.

[0019] Preferably, one end of the rotating shaft, on which the through ring is installed, is connected with the induction magnetic ring.

[0020] Preferably, the stator assembly comprises a connecting bearing, and the connecting bearing is connected with the rotating shaft and the casing respectively.

[0021] Preferably, the through ring comprises insulating bakelite and three groups of electrical connecting pieces, one group of electrical connecting pieces comprises at least one electrical connecting piece, and the through ring is integrally formed with the three groups of electrical connecting pieces through the insulating bakelite and injection molding;

[0022] The insulating bakelite is provided with through grooves, the number of the through grooves is the same as that of the electrical connecting pieces, and one electrical connecting piece is placed in one through groove.

[0023] The electrical connecting pieces are in conduction with the three-phase connecting line, and the electrical connecting pieces are respectively connected with the winding coil and the ball bearing at two ends.

[0024] The conducting ring sequentially passes through the three ball bearings.

[0025] Preferably, the first end and the second end of the conducting ring are divided into an upper section, a middle section and a lower section, and the three ball bearings are arranged corresponding to the upper section, the middle section and the lower section respectively.

[0026] The through slot comprises a first port and a second port, the first port is arranged at one end of the conducting ring, and the second ports of the same group of electrical connectors correspond to the same ball bearing.

[0027] The above technical solutions provided by the present application have the following advantages compared with the prior art:

[0028] The rotor assembly is arranged inside the stator assembly, the magnetic ring is fixed to the shell, the rotor assembly rotates inside the magnetic ring, the magnetic ring is arranged outside, stronger magnetic field strength can be obtained, the output torque is larger, and the efficiency is higher, the shell is a fixed structure and does not rotate with the rotor assembly, so that it is more convenient to install other mechanisms or on other mechanisms, the DC brushless motor not only has the structure feature of the inner rotor brushless motor that is convenient to install, but also has the performance feature of the outer rotor brushless motor that has large output torque, compared with the traditional inner rotor brushless motor, the DC brushless motor can provide greater output power, high torque, high efficiency and other advantages.

[0029] Further, if the existing outer rotor motor is installed on other mechanisms, an additional shell needs to be additionally increased, the shell of the DC brushless motor can avoid the problem of additionally setting the shell, and the overall cost of the motor is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor under the premise of not paying the creative labor.

[0032] Figure 1 The structure schematic diagram of the DC brushless motor provided by the present application is shown in the figure.

[0033] Figure 2 The structure schematic diagram of the DC brushless motor provided by the present application is shown in the figure.

[0034] Figure 3 The structure schematic diagram of the stator assembly of the DC brushless motor provided by the present application is shown in the figure.

[0035] Figure 4 A structure diagram of a rotor assembly of a direct current brushless motor is provided in the present application;

[0036] Figure 5 A connection structure diagram of a rotor assembly, a ball bearing and an induction magnetic ring of a direct current brushless motor is provided in the present application;

[0037] Figure 6 An explosion structure diagram of a circuit board and an induction magnetic ring of a direct current brushless motor is provided in the present application;

[0038] Figure 7 A connection structure diagram of a position control assembly and an end cover assembly of a direct current brushless motor is provided in the present application;

[0039] Figure 8 A connection structure diagram of a conducting ring, a circuit board, a ball bearing and a three-phase connecting wire of a direct current brushless motor is provided in the present application;

[0040] Figure 9 An explosion structure diagram of a ball bearing and an insulating gasket of a direct current brushless motor is provided in the present application;

[0041] Figure 10 A structure diagram of a conducting ring of a direct current brushless motor is provided in the present application;

[0042] Figure 11 An explosion structure diagram of a conducting ring of a direct current brushless motor is provided in the present application.

[0043] Explanation of reference signs:

[0044] 1. A direct current brushless motor;

[0045] 11. A rotor assembly; 111. A rotating shaft; 112. A rotor core; 113. A winding coil; 114. A conducting ring; 1141. An insulating bakelite; 1142. An electrical connecting piece; 1143. A hook; 1144. A connecting part; 1145. A contact part; 1146. A through slot; 1147. A first port; 1148. A second port;

[0046] 12. A stator assembly; 121. A machine shell; 1211. An opening; 122. A magnetic ring; 123. A connecting bearing;

[0047] 13. A first end cover;

[0048] 14. An end cover assembly; 141. A ball bearing; 142. An insulating gasket;

[0049] 15, position control assembly; 151, hall sensor; 152, induction magnetic ring; 153, three-phase connection line; 154, circuit board; 155, connection terminal; 156, end cover support. DETAILED DESCRIPTION

[0050] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0051] Referring to Figures 1-11 The utility model discloses a kind of direct-current brushless motor 1, it includes first end cover 13, rotor assembly 11, stator assembly 12, the rotor assembly 11 is connected with the stator assembly 12, the stator assembly 12 includes casing 121 and magnetic ring 122, the central axis of the magnetic ring 122 is on same straight line with the central axis of the casing 121, the casing 121 is covered in the outside of the magnetic ring 122, the casing 121 is connected with the first end cover 13 buckling, the casing 121 is covered in the outside of the magnetic ring 122, the magnetic ring 122 is covered in the outside of the rotor assembly 11, the rotating shaft 111 of the rotor assembly 11 passes through the casing 121 and extends outside.

[0052] Specifically, magnetic ring 122 is in contact with the inner wall of casing 121, magnetic ring 122 is coaxial with casing 121, first end cover 13 is cover-shaped, casing 121 is buckled on first end cover 13, and the two overlap, rotor assembly 11 and stator assembly 12 are buckled by the two, magnetic ring 122 is covered outside rotor assembly 11, and rotor assembly 11 rotates in stator assembly 12.

[0053] It can be understood that rotor assembly 11 is arranged inside stator assembly 12, direct-current brushless motor 1 is an inner rotor motor, magnetic ring 122 is fixed in casing 121, rotor assembly 11 rotates inside magnetic ring 122, and magnetic ring 122 is arranged outside. Compared with the existing inner rotor motor, magnetic ring 122 is arranged outside rotor, so that the size of magnetic ring 122 can be set larger, stronger magnetic field strength is obtained, the output torque is larger, and the efficiency is higher. In addition, casing 121 is arranged outside stator assembly 12, and casing 121 is a fixed structure and does not rotate with rotor assembly 11, so that it is more convenient to install other mechanisms or on other mechanisms. That is, direct-current brushless motor 1 not only has the structural characteristics of the inner rotor brushless motor, but also has the performance characteristics of the large output torque of the outer rotor brushless motor. Compared with the traditional inner rotor brushless motor, it can provide greater output power, high torque, high efficiency and other advantages.

[0054] Further, the direct current brushless motor 1 is suitable for installation of a standard gear box, and can be used in scenes of large torque and accurate control of position and rotation speed, such as scenes of automobile tail door, tail wing, etc.

[0055] Further, if the existing outer rotor motor is installed on other mechanisms, an additional shell needs to be added, and the shell of the direct current brushless motor can avoid the problem of additional shell setting, and reduce the overall cost of the motor.

[0056] The direct current brushless motor 1 comprises an end cover assembly 14 and a position control assembly 15, the end cover assembly 14 and the position control assembly 15 are arranged on the first end cover 13, the end cover assembly 14 is connected with the rotor assembly 11, and the position control assembly 15 is connected with the end cover assembly 14. Specifically, one end of the opening 1211 of the first end cover 13 is away from the shell 121, the position control assembly 15 and the end cover assembly 14 are installed at one end of the opening 1211 of the first end cover 13, and the rotor assembly 11 penetrates the first end cover 13 and is connected with the end cover assembly 14.

[0057] The position control assembly 15 comprises a Hall sensor 151, an induction magnetic ring 152, a three-phase connecting line 153, and a circuit board 154, the induction magnetic ring 152 is connected with the rotor assembly 11, the Hall sensor 151 is integrated on the circuit board 154, the three-phase connecting line 153 is connected with the circuit board 154, and the three-phase connecting line 153 provides three-phase power supply.

[0058] Specifically, the Hall sensor 151 is fixedly installed on the circuit board 154, the induction magnetic ring 152 is installed on the rotor assembly 11, the induction magnetic ring 152 rotates coaxially with the rotor assembly 11, the three-phase connecting line 153 is connected with the circuit board 154, the three-phase connecting line 153 is in conduction with the rotor assembly 11, and the three-phase connecting line 153 supplies power to the rotor assembly 11. The connecting lines of the two Hall sensors 151 and the center of the circuit board 154 form an included angle, the size of the included angle is 135°, and the position signal is fed back through the potential phase difference generated by the interaction of the Hall sensor 151 and the induction magnetic ring 152. It can be understood that the Hall sensor 151 converts the change of the magnetic field into a corresponding electric signal by detecting the change of the magnetic field, and then provides the rotor position, angle and speed.

[0059] The end cover assembly 14 comprises three ball bearings 141, and insulating pads 142, the three ball bearings 141 are stacked in sequence, and the insulating pads 142 are arranged between adjacent ball bearings 141. Specifically, the three ball bearings 141 are stacked in sequence and arranged concentrically, the ball bearings 141 are used for conduction with the three-phase connecting wires 153 and the rotor assembly 11, the insulating pads 142 are arranged between the ball bearings 141 to insulate the ball bearings 141 from each other, and different ball bearings 141 respectively transmit one phase of the three-phase connecting wires 153 and then transmit to the rotor assembly 11.

[0060] In particular, the ball bearings 141 are made of bearing steel, and the internal grease is conductive grease.

[0061] The position control assembly 15 comprises three connecting terminals 155 and an end cover support 156, the circuit board 154 is fixedly connected with the end cover support 156, the connecting terminals 155 are connected with the end cover support 156, the end cover support 156 is connected with the first end cover 13, the ball bearings 141 and the connecting terminals 155 are buckled by the end cover support 156 and the first end cover 13, the three connecting terminals 155 are connected with the three-phase connecting wires 153, and one connecting terminal 155 is connected with one ball bearing 141.

[0062] Specifically, the three connecting terminals 155 are respectively connected with one ball bearing 141 and electrically conductive, transmitting one phase of the three-phase power supply, the opening 1211 of the first end cover 13 is buckled on the end cover support 156, and the end cover assembly 14 and other mechanisms of the position control assembly 15 are buckled to play a protection role, one ball bearing 141 and one connecting terminal 155 are in conduction to transmit the power supply. The connecting terminal 155 is made of copper sheet, one end of the connecting terminal 155 connected with the ball bearing 141 is arranged in a circular ring shape, and the circular rings of the connecting terminals 155 are uniformly arranged according to the height of the ball bearing 141, so as to avoid the mutual contact between the connecting terminals 155.

[0063] As an embodiment, the first end cover 13 and the end cover support 156 are made by injection molding process, and are made of nylon material by injection molding.

[0064] Particularly, the three connecting terminals 155 are integrally formed with the first end cover through an injection molding process. It can be understood that the connecting terminals match the shape of the conducting ring 114 on the rotor assembly 11, are provided in a circular ring shape, and are in contact with the conducting ring 114. In addition, the outer periphery of the circular ring part of the connecting terminal is further provided with an extended connecting part which is arranged perpendicularly to the circular ring part. The connecting part of the connecting terminal is inserted into the circuit board 154 and is in electrical conduction with the three-phase connecting wires 153 on the circuit board 154. In the manufacturing of the first end cover 13 and the connecting terminal 155, the connecting terminal 155 is first manufactured in shape through a stamping process or the like. Then, the three connecting terminals 155 are placed in the mold according to the predetermined position. The first end cover 13 is manufactured through an injection molding process, so that the connecting terminal 155 and the first end cover 13 become one body. In the subsequent installation, the rotor assembly 11 is inserted into the central position of the connecting terminal 155 and the first end cover 13 and penetrates the connecting terminal 155 and the first end cover 13. In addition, the first end cover 13 is buckled and connected with the end cover support 156, and the connecting terminal 155 is inserted into the circuit board 154.

[0065] Specifically, the rotor core 112 adopts a six-slot core, and the winding coil 113 is wound on the core and adopts star or delta winding. The wire head of the winding coil 113 is connected with the conducting ring 114. When the winding coil 113 is electrified, a rotating magnetic field is generated, which interacts with the magnetic field of the magnetic ring 122, thereby generating a torque to make the rotor core 112 and the winding coil 113 rotate around the rotating shaft 111, thereby generating a driving force. The rotating shaft 111 penetrates the rotor core 112. One end of the rotating shaft 111 is exposed outside the shell 121 and provides driving force for the connected equipment. The other end is provided with the conducting ring 114, and then the end is connected with the inductive magnetic ring 152. The inductive magnetic ring 152 rotates coaxially with the rotating shaft 111. The inductive magnetic ring 152 interacts with the Hall sensor 151 to reflect the rotation of the rotating shaft 111, reflect the position, angle and speed of the rotor, and reflect other parameters. The ball bearing 141 is arranged outside the conducting ring 114. The conducting ring 114 is provided with a metal conductive element which is in contact with the ball bearing 141 and is in conduction, so that the power supplied by the three-phase connecting wires 153 is transmitted to the winding coil 113.

[0066] The conducting ring 114 includes insulating bakelite 1141, three groups of electrical connectors 1142, one group of electrical connectors 1142 includes at least one electrical connector 1142, the insulating bakelite 1141 is provided with through slots 1146, the number of the through slots 1146 is the same as the number of the electrical connectors 1142, one electrical connector 1142 is placed in one through slot 1146, the electrical connector 1142 is in conduction with the three-phase connecting wire 153, the electrical connector 1142 is connected with the winding coil 113 and the ball bearing 141 at both ends respectively, and the insulating bakelite 1141 sequentially passes through the three ball bearings 141. The insulating bakelite 1141 is divided into an upper section, a middle section and a lower section between the first end and the second end, and the three ball bearings 141 are arranged corresponding to the upper section, the middle section and the lower section respectively, and the through slot 1146 includes a first port 1147 and a second port 1148, the first port 1147 is arranged at one end of the insulating bakelite 1141, and the second ports 1148 of the electrical connectors 1142 in the same group extend correspondingly to the same ball bearing 141.

[0067] Specifically, the three-phase connecting wire 153 adopts three connecting wires, and each group of electrical connectors 1142 in the three groups of electrical connectors 1142 is connected with one connecting wire, the insulating bakelite 1141 of the conducting ring 114 is provided with through slots 1146, the through slots 1146 are not communicated with each other, one electrical connector 1142 is placed in one through slot 1146, the electrical connectors 1142 in the same group are placed in the oppositely arranged through slots 1146, the electrical connector 1142 is made of copper sheet and is divided into two parts, including a hook 1143, a connecting part 1144 and a contact part 1145, the hook 1143, the connecting part 1144 and the contact part 1145 are integrally formed, wherein the hook 1143 extends from the first port 1147 of the through slot 1146, the contact part 1145 extends from the second port 1148, and the connecting part 1144 is entirely in the through slot 1146, the contact part 1145 is in contact with the external ball bearing 141, the hook 1143 is connected with the winding coil 113, the insulating bakelite 1141 is divided into three sections, the second ports 1148 are distributed according to the upper section, the middle section and the lower section, and correspond to the heights of the ball bearings 141, the contact part 1145 extending from the second port 1148 can accurately connect the ball bearing 141, thereby transmitting the power supply.

[0068] The conducting ring 114 is integrally formed by the insulating bakelite 1141 and the three groups of electrical connectors 1142 by injection molding, the three groups of electrical connectors 1142 are made of copper sheet, which is processed by stamping and shaping to form the hook 1143 structure, then the electrical connector 1142 is placed in the injection mold to form the insulating bakelite 1141, and then the conducting ring 114 is made by turning and rounding, and the insulating material for making the insulating bakelite 1141 is bakelite powder.

[0069] In the embodiment, the electric connectors 1142 are provided in six, which are divided into three groups, and each group has two electric connectors 1142, and the electric connectors 1142 in the same group have the same length, but the number of the electric connectors 1142 is not limited to the number provided in the embodiment, and can be three, nine or more, and the specific number can be set according to actual needs.

[0070] The stator assembly 12 comprises connecting bearings 123, which are connected to the rotating shaft 111 and the casing 121 respectively.

[0071] Working principle: The three-phase connecting line 153 is connected to a three-phase power supply to supply power to the circuit board 154, so that the Hall sensor 151 installed on the circuit board 154 normally operates, the connecting terminal 155, the ball bearing 141, the conducting ring 114 and the winding coil 113 are conducted, and interact with the magnetic field of the magnetic ring 122, the rotor core 112, the rotating shaft 111, the conducting ring 114 and the induction magnetic ring 152 rotate, the rotating shaft 111 extends out of the casing 121 to provide driving force, and the induction magnetic ring 152 interacts with the Hall sensor 151, the Hall sensor 151 monitors the magnetic field change of the induction magnetic ring 152, converts into an electrical signal and transmits to the upper system through the circuit board 154, and the real-time position, angle and speed of the rotor can be obtained.

[0072] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0073] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0074] In addition, the terms "first", "second", "third", etc. are used herein only to describe various circumstances, and should not be construed as indicating or implying relative importance or an indicated number of the technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0075] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be connected, or it can be detachable, or it can be integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0076] In the present application, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can include the direct contact of the first and second features, or the indirect contact of the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0077] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0078] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, these modifications and variations of the present application are within the scope of the claims of the present application and its equivalent technologies, and the present application also intends to include these modifications and variations.

[0079] The above describes the specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A direct current brushless motor, characterized by, The application relates to a motor, which comprises a first end cover, a rotor assembly and a stator assembly, wherein the rotor assembly is connected with the stator assembly. The stator assembly comprises a casing and a magnetic ring, the central axis of the magnetic ring is in line with the central axis of the casing, and the casing is sleeved outside the magnetic ring. The casing is connected with the first end cover, the casing is sleeved outside the magnetic ring, the magnetic ring is sleeved outside the rotor assembly, and the rotating shaft of the rotor assembly extends outside through the casing.

2. The brushless DC motor of claim 1, wherein, The motor comprises an end cover assembly and a position control assembly, which are arranged on the first end cover. The end cover assembly is connected with the rotor assembly, and the position control assembly is connected with the end cover assembly.

3. The brushless DC motor of claim 2, wherein, The position control assembly comprises a Hall sensor, an induction magnetic ring, three-phase connecting wires and a circuit board. The induction magnetic ring is connected with the rotor assembly, the Hall sensor is integrated on the circuit board, the three-phase connecting wires are connected with the circuit board, and the three-phase connecting wires provide three-phase power supply.

4. The brushless DC motor of claim 3, wherein, The end cover assembly comprises three ball bearings and insulating gaskets, the three ball bearings are sequentially stacked, and the insulating gaskets are arranged between adjacent two ball bearings.

5. The brushless DC motor of claim 4, wherein, The position control assembly comprises three connecting terminals and an end cover support, the circuit board is fixedly connected with the end cover support, the connecting terminals are connected with the end cover support, the end cover support is connected with the first end cover, and the ball bearings and the connecting terminals are connected with the first end cover through the end cover support; The three connecting terminals and the first end cover are integrally formed through an injection molding process; The three connecting terminals are connected with the three-phase connecting wires, and one connecting terminal is connected with one ball bearing.

6. The brushless DC motor of claim 1, wherein, The rotor assembly comprises a rotating shaft, a rotor core, a winding coil and a through ring. The rotor core is centrally symmetrically arranged, the winding coil is connected with the rotor core, the rotating shaft penetrates the central axis of the rotor core, and the through ring is connected with the rotating shaft. The rotor core is arranged at the middle part of the rotating shaft, the through ring is arranged at one end of the rotating shaft, and the other end of the rotating shaft penetrates the casing.

7. The brushless DC motor of claim 1, wherein, One end of the rotating shaft, on which the through ring is arranged, is connected with the induction magnetic ring.

8. The brushless DC motor of claim 1, wherein, The stator assembly comprises connecting bearings, which are respectively connected with the rotating shaft and the casing.

9. The brushless DC motor of claim 6, wherein, The through ring comprises insulating bakelite and three groups of electric connecting pieces, one group of electric connecting pieces comprises at least one electric connecting piece, and the through ring is integrally formed with the three groups of electric connecting pieces through the insulating bakelite and injection molding; The insulating bakelite is provided with through grooves, the number of the through grooves is same as that of the electric connecting pieces, and one electric connecting piece is arranged in one through groove; The electric connecting pieces are in conduction with the three-phase connecting wires, and the two ends of the electric connecting pieces are respectively connected with the winding coil and the ball bearing. The through ring sequentially penetrates the three ball bearings.

10. The brushless DC motor of claim 9, wherein, The through ring is divided into an upper section, a middle section and a lower section between a first end and a second end of the through ring, and the three ball bearings are arranged in correspondence with the upper section, the middle section and the lower section. The through grooves comprise first ports and second ports, the first ports are arranged at one end of the through ring, and the second ports of the electric connecting pieces of the same group correspond to the same ball bearing.

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