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 brushless DC motors, and in particular to a brushless DC motor. Background Art

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

[0003] Existing brushless DC motors are divided into inner rotor brushless motors and outer rotor brushless motors. The outer rotor brushless motor's rotor and magnet can be set with a larger outer diameter, a higher magnetic field strength, and a larger output torque. The inner rotor brushless motor has an external fixed structure, which is convenient for installing other mechanisms. Existing brushless DC motors cannot have the characteristics of both outer rotor motors and inner rotor brushless motors, and the practical effect is not good. Summary of the invention

[0004] The technical problem to be solved by the present application is that the existing brushless DC motors are divided into inner rotor brushless motors and outer rotor brushless motors. The outer rotor brushless motor has a larger rotor and a higher magnetic field strength, and a larger output torque. The inner rotor brushless motor has an external fixed structure, which is convenient for installing other mechanisms. The existing brushless DC motor cannot have the characteristics of both the outer rotor motor and the inner rotor brushless motor, and the practical effect is not good.

[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 brushless DC motor.

[0006] The present invention discloses a brushless DC motor, which comprises a first end cover, a rotor assembly, and a stator assembly, wherein the rotor assembly is connected to the stator assembly;

[0007] The stator assembly comprises a housing and a magnetic ring, the central axis of the magnetic ring and the central axis of the housing are on the same straight line, and the housing is sleeved outside the magnetic ring;

[0008] The housing is buckled and connected to the first end cover, the housing is sleeved on the outside of the magnetic ring, the magnetic ring is sleeved on the outside of the rotor assembly, and the rotating shaft of the rotor assembly passes through the housing and extends to the outside.

[0009] Preferably, it comprises an end cover assembly and a position control assembly, and the end cover assembly and the position control assembly are arranged on the first end cover;

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

[0011] Preferably, the position control assembly includes a Hall sensor, an induction magnetic ring, a three-way connection wiring, and a circuit board;

[0012] The induction magnetic ring is connected to the rotor assembly, the Hall sensor is integrated on the circuit board, a three-phase connection wire is connected to the circuit board, and the three-phase connection wire 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 two adjacent ball bearings.

[0014] Preferably, the position control assembly comprises three connection terminals and an end cover bracket, the circuit board is fixedly connected to the end cover bracket, the connection terminal is connected to the end cover bracket, the end cover bracket is buckled and connected to the first end cover, and the ball bearing and the connection terminal are buckled by the end cover bracket and the first end cover;

[0015] Three connecting terminals are connected to the three-way connection wires, and one connecting terminal is connected to a ball bearing.

[0016] Preferably, the rotor assembly includes a rotating shaft, a rotor core, a winding coil, and a conducting ring;

[0017] The rotor core is centrally symmetrically arranged, the winding coil is connected to the rotor core, the rotating shaft passes through the central axis of the rotor core, and the conducting ring is connected to the rotating shaft;

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

[0019] Preferably, one end of the rotating shaft mounting conductive ring is connected to the induction magnetic ring.

[0020] Preferably, the stator assembly includes connecting bearings, and the connecting bearings are respectively connected to the rotating shaft and the casing.

[0021] Preferably, the conducting ring comprises insulating bakelite and three groups of electrical connectors, wherein one group of electrical connectors comprises at least one electrical connector, and the conducting ring is formed by injection molding the insulating bakelite and the three groups of electrical connectors into one piece;

[0022] The insulating bakelite is provided with through slots, the number of which is the same as the number of the electrical connectors, and one electrical connector is placed in one through slot;

[0023] The electrical connector is connected to the three-phase connection wire, and the two ends of the electrical connector are respectively connected to the winding coil and the ball bearing;

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

[0025] Preferably, the conducting ring 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 are respectively arranged corresponding to the upper section, the middle section and the lower section;

[0026] The through slot includes a first port and a second port. The first port is arranged at one end of the conducting ring, and the second port from which the same group of electrical connectors extends corresponds to the same ball bearing.

[0027] The above technical solution provided by this application has the following advantages compared with the prior art:

[0028] The present application provides a brushless DC motor, in which a rotor assembly is arranged inside a stator assembly, a magnetic ring is fixed to a casing, the rotor assembly rotates inside the magnetic ring, and the magnetic ring is arranged outside, so that a stronger magnetic field strength can be obtained, the output torque is greater, and the efficiency is higher. The casing is a fixed structure and does not rotate with the rotation of the rotor assembly, making it more convenient to install or install on other mechanisms. The brushless DC motor not only has the structural feature of an inner rotor brushless motor that is easy to install, but also has the performance feature of a large output torque of an outer rotor brushless motor. Compared with a traditional inner rotor brushless motor, it can provide greater output power, as well as advantages such as high torque and high efficiency.

[0029] Furthermore, if the existing outer rotor motor is installed on other mechanisms, an additional housing is required. The housing of the brushless DC motor can avoid the problem of setting up an additional housing and reduce the overall cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0031] In order to more clearly illustrate the embodiments of the present invention 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 A schematic diagram of the structure of a brushless DC motor provided in this application;

[0033] Figure 2 A schematic diagram of the exploded structure of a brushless DC motor provided in this application;

[0034] Figure 3 A schematic diagram of an exploded structure of a stator assembly of a brushless DC motor provided in the present application;

[0035] Figure 4 A schematic structural diagram of a rotor assembly of a brushless DC motor provided in the present application;

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

[0037] Figure 6 A schematic diagram of the exploded structure of a circuit board and an induction magnetic ring of a brushless DC motor provided in this application;

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

[0039] Figure 8 A schematic diagram of the connection structure of a conduction ring, a circuit board, a ball bearing, and a three-way connection of a brushless DC motor provided in the present application;

[0040] Fig. 9 A schematic diagram of the exploded structure of a ball bearing and an insulating gasket of a brushless DC motor provided in the present application;

[0041] Fig.10 A schematic diagram of the structure of a conduction ring of a brushless DC motor provided in the present application;

[0042] Fig.11 A schematic diagram of the exploded structure of a conduction ring of a brushless DC motor provided in the present application.

[0043] Description of reference numerals:

[0044] 1. Brushless DC motor;

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

[0046] 12. stator assembly; 121. housing; 1211. opening; 122. magnetic ring; 123. connecting bearing;

[0047] 13. First end cover;

[0048] 14. End cover assembly; 141. Ball bearing; 142. Insulating gasket;

[0049] 15. Position control assembly; 151. Hall sensor; 152. Induction magnetic ring; 153. Three-way connection wiring; 154. Circuit board; 155. Connection terminal; 156. End cover bracket. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0051] See also Figure 1-11 The present invention discloses a brushless DC motor 1, which includes a first end cover 13, a rotor assembly 11, and a stator assembly 12. The rotor assembly 11 is connected to the stator assembly 12. The stator assembly 12 includes a housing 121 and a magnetic ring 122. The central axis of the magnetic ring 122 is on the same straight line as the central axis of the housing 121. The housing 121 is sleeved on the outside of the magnetic ring 122. The housing 121 is snap-fitted with the first end cover 13. The housing 121 is sleeved on the outside of the magnetic ring 122. The magnetic ring 122 is sleeved on the outside of the rotor assembly 11. The rotating shaft 111 of the rotor assembly 11 passes through the housing 121 and extends to the outside.

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

[0053] It can be understood that the rotor assembly 11 is arranged inside the stator assembly 12, the DC brushless motor 1 is an inner rotor motor, the magnetic ring 122 is fixed to the casing 121, the rotor assembly 11 rotates inside the magnetic ring 122, and the magnetic ring 122 is arranged on the outside. Compared with the existing inner rotor motor, the magnetic ring 122 is arranged outside the rotor, so that the size of the magnetic ring 122 can be set larger, and a stronger magnetic field strength is obtained, the output torque is larger, and the efficiency is higher. In addition, the casing 121 is arranged outside the stator assembly 12, and the casing 121 is a fixed structure and does not rotate with the rotation of the rotor assembly 11, which makes it more convenient to install other mechanisms or install on other mechanisms. That is, the DC brushless motor 1 not only has the structural feature of the inner rotor brushless motor that is easy to install, but also has the performance feature 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, as well as high torque, high efficiency and other advantages.

[0054] Furthermore, the brushless DC motor 1 is suitable for installation in a standard gearbox and can be used in scenarios requiring large torque and precise control of position and speed, such as automobile tailgates and rear wings.

[0055] Furthermore, if the existing outer rotor motor is installed on other mechanisms, an additional housing is required. The housing of the brushless DC motor can avoid the problem of setting up an additional housing, thereby reducing the overall cost of the motor.

[0056] The brushless DC motor 1 includes an end cover assembly 14 and a position control assembly 15, wherein 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 to the rotor assembly 11, and the position control assembly 15 is connected to the end cover assembly 14. Specifically, one end of the opening 1211 of the first end cover 13 is away from the housing 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 to the end cover assembly 14.

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

[0058] Specifically, the Hall sensor 151 is fixedly mounted on the circuit board 154, the induction magnetic ring 152 is mounted on the rotor assembly 11, the induction magnetic ring 152 rotates coaxially with the rotor assembly 11, the three-way connection wire 153 is connected to the circuit board 154, the three-way connection wire 153 is conductive with the rotor assembly 11, and the three-way connection wire 153 supplies power to the rotor assembly 11. The line connecting the two Hall sensors 151 and the center of the circuit board 154 forms an angle of 135°, and the position signal is fed back through the potential phase difference generated by the interaction between 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 electrical signal, thereby providing the rotor position, angle and speed.

[0059] The end cover assembly 14 includes three ball bearings 141 and an insulating gasket 142. The three ball bearings 141 are stacked in sequence, and the insulating gasket 142 is arranged between two adjacent ball bearings 141. Specifically, the three ball bearings 141 are stacked in sequence and arranged concentrically. The ball bearings 141 are used to conduct with the three-phase connection wire 153 and the rotor assembly 11. The insulating gasket 142 is arranged between the ball bearings 141 to insulate the ball bearings 141 from each other. Different ball bearings 141 transmit one-phase power of the three-phase connection wire 153 respectively, and then transmit it to the rotor assembly 11.

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

[0061] The position control assembly 15 includes three connecting terminals 155 and an end cover bracket 156, the circuit board 154 is fixedly connected to the end cover bracket 156, the connecting terminal 155 is connected to the end cover bracket 156, the end cover bracket 156 is snap-fitted to the first end cover 13, the ball bearing 141 and the connecting terminal 155 are snap-fitted to the first end cover 13 by the end cover bracket 156, the three connecting terminals 155 are connected to the three-connection wire 153, and one connecting terminal 155 is connected to one ball bearing 141.

[0062] Specifically, the three connection terminals 155 are respectively connected to a ball bearing 141, and are 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 bracket 156, and the end cover assembly 14 and other mechanisms of the position control assembly 15 are buckled, which can play a protective role. One ball bearing 141 is connected to one connection terminal 155 to transmit power. The connection terminal 155 is made of copper sheet, and one end of the connection terminal 155 connected to the ball bearing 141 is set in a circular ring shape, and is set according to the height of the ball bearing 141. The rings of each connection terminal 155 are evenly set to avoid contact between the connection terminals 155.

[0063] As an embodiment, the first end cover 13 and the end cover bracket 156 are manufactured by injection molding process, and nylon material is used for injection molding.

[0064] In particular, the three connecting terminals 155 are integrally formed with the first end cover by an injection molding process. It can be understood that the shape of the connecting terminal matches the shape of the conducting ring 114 on the rotor assembly 11, and a circular ring shape is set to contact the conducting ring 114. In addition, an extended connecting portion is also set on the outer periphery of the circular ring portion of the connecting terminal, and the connecting portion is vertically arranged with the circular ring portion. The connecting portion of the connecting terminal is inserted into the circuit board 154 and is electrically connected with the three-connection wire 153 on the circuit board 154. When the first end cover 13 and the connecting terminal 155 are manufactured, First, the connecting terminal 155 is manufactured into an outer shape by stamping or other processing methods, and then the three connecting terminals 155 are placed in the mold according to the preset position, and the first end cover 13 is manufactured by injection molding so that the connecting terminal 155 and the first end cover 13 are integrated. In the subsequent installation, the rotor assembly 11 is inserted into the center 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 snap-fitted to the end cover bracket 156, and the connecting terminal 155 is inserted into the circuit board 154. The rotor assembly 11 includes a rotating shaft 111, a rotor core 112, a winding coil 113, and a conducting ring 114. The rotor core 112 is centrally symmetrically arranged, the winding coil 113 is connected to the rotor core 112, the rotating shaft 111 passes through the central axis of the rotor core 112, the conducting ring 114 is connected to the rotating shaft 111, the rotor core 112 is installed in the middle of the rotating shaft 111, the conducting ring 114 is installed at one end of the rotating shaft 111, and the other end of the rotating shaft 111 passes through the casing 121.

[0065] Specifically, the rotor core 112 adopts a six-slot core, and the winding coil 113 is wound on the core, using a star or triangle winding. The end of the winding coil 113 is connected to the conductive ring 114. The winding coil 113 is energized to generate a rotating magnetic field, which interacts with the magnetic field of the magnetic ring 122, thereby generating a torque, so that the rotor core 112 and the winding coil 113 rotate around the rotating shaft 111, thereby generating a driving force. The rotating shaft 111 passes through the rotor core 112, and one end of the rotating shaft 111 passes through the housing 121 and is exposed outside the housing 121 to provide driving force for the connected equipment. The conductive ring 114 is installed on the other end, and then the end is connected to the induction magnetic ring 152. The induction magnetic ring 152 rotates coaxially with the rotating shaft 111. The action of the induction magnetic ring 152 and the Hall sensor 151 can reflect the rotation of the rotating shaft 111, and reflect the parameters such as the position, angle and speed of the rotor. The ball bearing 141 is arranged outside the conducting ring 114 . A metal conductive element is arranged on the conducting ring 114 , which contacts and conducts with the ball bearing 141 , so that the power connected to the three-phase connecting line 153 is transmitted to the winding coil 113 .

[0066] The conducting ring 114 includes an insulating bakelite 1141 and three groups of electrical connectors 1142. A group of electrical connectors 1142 includes at least one electrical connector 1142. A through slot 1146 is provided on the insulating bakelite 1141. 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 conductively connected to the three-connection wire 153. The two ends of the electrical connector 1142 are respectively connected to the winding coil 113 and the ball bearing 141. The insulating bakelite 1141 passes through the three ball bearings 141 in sequence. 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. The three ball bearings 141 are respectively arranged corresponding to the upper section, the middle section, and the lower section. The through groove 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. The second port 1148 extending from the same group of electrical connectors 1142 corresponds to the same ball bearing 141.

[0067] Specifically, the three-way connection line 153 uses three connecting wires, and each group of electrical connectors 1142 in the three groups of electrical connectors 1142 is connected to a connecting wire. A through groove 1146 is set on the insulating bakelite 1141 of the conducting ring 114, and each through groove 1146 is not connected. One electrical connector 1142 is placed in one through groove 1146, and the electrical connectors 1142 of the same group are placed in the through grooves 1146 arranged oppositely. 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 145 is integrally formed, wherein the hook 1143 extends from the first port 1147 of the through slot 1146, the contact portion 1145 extends from the second port 1148, the connecting portion 1144 is entirely in the through slot 1146, the contact portion 1145 contacts the external ball bearing 141, the hook 1143 is connected to the winding coil 113, the insulating bakelite 1141 is divided into three sections, the second port 1148 is distributed according to the upper section, the middle section, and the lower section, corresponding to the height of the ball bearing 141, and the contact portion 1145 extending from the second port 1148 can accurately connect to the ball bearing 141, thereby transmitting power.

[0068] The conducting ring 114 is formed by injection molding an insulating bakelite 1141 and three sets of electrical connectors 1142. The three sets of electrical connectors 1142 are made of copper sheets, which are processed by stamping and shaping to form a hook 1143 structure. The electrical connector 1142 is then placed in an injection mold to form the insulating bakelite 1141, which is then turned into a full circle to form the conducting ring 114. The insulating material used to make the insulating bakelite 1141 is bakelite powder.

[0069] In this embodiment, there are 6 electrical connectors 1142, which are divided into three groups, with two electrical connectors 1142 in each group. The lengths of the electrical connectors 1142 in the same group are the same, but the number of electrical connectors 1142 is not limited to the number set in this embodiment, and can be three, nine or more. The specific number can be set according to actual needs.

[0070] The stator assembly 12 includes a connecting bearing 123, and the connecting bearing 123 is respectively connected to the rotating shaft 111 and the housing 121. Specifically, an opening 1211 is provided on the housing 121, and the rotating shaft 111 extends from the opening 1211 of the housing 121. The inner ring of the connecting bearing 123 is connected to the rotating shaft 111, and the outer ring is connected to the housing 121, so that the rotating shaft 111 can rotate relative to the housing 121. By installing the connecting bearing 123, the housing 121 and the rotating shaft 111 can be fixed and stabilized, so as to prevent the rotating shaft 111 from shaking relative to the housing 121 when the motor is operating normally.

[0071] Working principle: The three-phase connection 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 can operate normally, and the connection terminal 155, the ball bearing 141, the conduction ring 114 and the winding coil 113 are turned on, interacting with the magnetic field of the magnetic ring 122, the rotor core 112, the rotating shaft 111, the conduction ring 114 and the induction magnetic ring 152 rotate, and 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 changes in the magnetic field of the induction magnetic ring 152, converts it into an electrical signal and transmits it to the upper system via the circuit board 154, so as to obtain the real-time position, angle and speed of the rotor.

[0072] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0073] 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 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, rather than indicating or implying 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 limiting the present invention.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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 "plurality" is two or more, unless otherwise clearly and specifically defined.

[0075] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected 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.

[0076] 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.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 invention. In this specification, the schematic representation 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0078] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0079] The above is a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A brushless DC motor, characterized in that: It includes a first end cover, a rotor assembly, and a stator assembly, wherein the rotor assembly is connected to the stator assembly; The stator assembly comprises a housing and a magnetic ring, the central axis of the magnetic ring and the central axis of the housing are on the same straight line, and the housing is sleeved outside the magnetic ring; The housing is buckled and connected to the first end cover, the housing is sleeved on the outside of the magnetic ring, the magnetic ring is sleeved on the outside of the rotor assembly, and the rotating shaft of the rotor assembly passes through the housing and extends to the outside.

2. The brushless DC motor according to claim 1, characterized in that: It comprises an end cover assembly and a position control assembly, wherein the end cover assembly and the position control assembly are arranged on the first end cover; The end cover assembly is connected to the rotor assembly, and the position control assembly is connected to the end cover assembly.

3. The brushless DC motor according to claim 2, characterized in that: The position control assembly includes a Hall sensor, an induction magnetic ring, a three-way connection wiring, and a circuit board; The induction magnetic ring is connected to the rotor assembly, the Hall sensor is integrated on the circuit board, a three-phase connection wire is connected to the circuit board, and the three-phase connection wire provides a three-phase power supply.

4. The brushless DC motor according to claim 3, characterized in that: The end cover assembly includes three ball bearings and an insulating gasket. The three ball bearings are stacked in sequence, and the insulating gasket is arranged between two adjacent ball bearings.

5. The brushless DC motor according to claim 4, characterized in that: The position control assembly includes three connection terminals and an end cover bracket, the circuit board is fixedly connected to the end cover bracket, the connection terminal is connected to the end cover bracket, the end cover bracket is buckled and connected to the first end cover, and the ball bearing and the connection terminal are buckled by the end cover bracket and the first end cover; The three connecting terminals and the first end cover are integrally formed by an injection molding process; Three connecting terminals are connected to the three-way connection wires, and one connecting terminal is connected to a ball bearing.

6. The brushless DC motor according to claim 1, characterized in that: The rotor assembly includes a rotating shaft, a rotor core, a winding coil, and a conducting ring; The rotor core is centrally symmetrically arranged, the winding coil is connected to the rotor core, the rotating shaft passes through the central axis of the rotor core, and the conducting ring is connected to the rotating shaft; The rotor core is installed in the middle of the rotating shaft, the conducting ring is installed at one end of the rotating shaft, and the other end of the rotating shaft passes through the casing.

7. The brushless DC motor according to claim 1, characterized in that: One end of the rotating shaft mounting the conducting ring is connected to the induction magnetic ring.

8. The brushless DC motor according to claim 1, characterized in that: The stator assembly includes connecting bearings, and the connecting bearings are respectively connected to the rotating shaft and the casing.

9. The brushless DC motor according to claim 6, characterized in that: The conducting ring comprises insulating bakelite and three groups of electrical connectors, wherein one group of electrical connectors comprises at least one electrical connector, and the conducting ring is formed by injection molding the insulating bakelite and the three groups of electrical connectors into one piece; The insulating bakelite is provided with through slots, the number of which is the same as the number of the electrical connectors, and one electrical connector is placed in one through slot; The electrical connector is connected to the three-phase connection wire, and the two ends of the electrical connector are respectively connected to the winding coil and the ball bearing; The conducting ring passes through the three ball bearings in sequence.

10. The brushless DC motor according to claim 9, characterized in that: The conducting ring 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 are respectively arranged corresponding to the upper section, the middle section, and the lower section; The through slot includes a first port and a second port. The first port is arranged at one end of the conducting ring, and the second port from which the same group of electrical connectors extends corresponds to the same ball bearing.

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