A three-phase brushless dc motor and motor wire method

Abstract

This invention discloses a three-phase brushless DC motor and a method for wiring the motor, relating to the field of motors, and aims to solve the current leakage problem of current three-phase windings. The invention winds coils on the winding columns of the stator of the motor body. The relative positions of the coils can form a first phase band, a second phase band, and a third phase band. Each of the first, second, and third phase bands is independently led out of the motor through two leads. In use, voltage can be applied to different leads to drive each phase winding, avoiding current leakage during the disconnection control time, thereby reducing motor heating, improving the efficiency of electromagnetic field generation, and ultimately improving the efficiency of the rotating motor.

Description

Technical Field

[0001] This invention relates to the field of motors, and more particularly to a three-phase DC brushless motor and a motor winding method. Background Technology

[0002] Brushless DC (BLDC) motors typically use three phases (windings), each with a 120-degree conduction interval. Each phase has two steps per conduction interval: if the three phases are A, B, and C, the commutation phase sequence is AB-AC-BC-BA-CA-CB. To maintain the magnetic field inside the stator before the rotor, a 60-degree rotating switching circuit is used to obtain maximum torque, precisely transitioning the rotor position from one sector to another. Therefore, by controlling the switches flowing through each phase, brushless motor rotation can be achieved.

[0003] In existing technology, there are two wiring methods for three-phase brushless DC motors: delta connection and star connection. In a delta connection, the end of one winding is connected to the beginning of another winding sequentially. In a star connection, the ends of the three windings are connected together individually. Regardless of the connection method, the motor has three leads. When driving the motor, drive voltage can only be applied to the three-phase windings at the leads. Furthermore, applying voltage to the three-phase windings is a high-frequency switching process (such as pulse width modulation control). When the windings are disconnected from the drive, a sudden drop in current can easily occur, causing the windings to heat up, which makes it difficult to improve the motor's conversion efficiency. Summary of the Invention

[0004] In view of this, the present invention provides a three-phase brushless DC motor and a motor winding method, which can solve the problem of current leakage in each phase winding in the prior art, and improve the generation efficiency of electromagnetic field of the motor, reduce the electrical energy consumed by current leakage, thereby improving the efficiency of the rotating motor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a three-phase brushless DC motor, comprising a motor body, the motor body comprising: a rotor having permanent magnet poles arranged along its circumference; a stator having 3n winding posts arranged along its circumference, where n represents an integer not less than 2; a first phase winding comprising a first phase band formed by coils wound on the winding posts, the first phase band having at least two windings evenly distributed angularly in the circumferential direction; a second phase winding comprising a second phase band formed by coils wound on the winding posts, the second phase band having the same number as the first phase band and being arranged adjacent to the first phase band; and a third phase winding comprising a winding of coils wound on the winding posts. The third phase band is formed by the winding posts, and the number of third phase bands is the same as that of the first phase bands and they are arranged adjacent to each other. The first phase winding is provided with a first lead and a second lead, which are used to generate a consistent phase current in each first phase band. The second phase winding is provided with a third lead and a fourth lead, which are used to generate a consistent phase current in each second phase band. The third phase winding is provided with a fifth lead and a sixth lead, which are used to generate a consistent phase current in each third phase band.

[0007] Preferably, the above-mentioned three-phase brushless DC motor comprises: a first phase winding including a first conductor, a second phase winding including a second conductor, and a third phase winding including a third conductor; the first conductor is wound on a winding post to form a coil of a first phase band, and the two ends of the first conductor are electrically connected to a first lead-out end and a second lead-out end, respectively; the phase current flowing through the first lead-out end and the second lead-out end forms a magnetic field with the same direction in each coil of the first phase band; the second conductor is wound on a winding post to form a coil of a second phase band, and the two ends of the second conductor are electrically connected to a third lead-out end and a fourth lead-out end, respectively; the phase current flowing through the third lead-out end and the fourth lead-out end forms a magnetic field with the same direction in each coil of the second phase band; the third conductor is wound on a winding post to form a coil of a third phase band, and the two ends of the third conductor are electrically connected to a fifth lead-out end and a sixth lead-out end, respectively; the phase current flowing through the fifth lead-out end and the sixth lead-out end forms a magnetic field with the same direction in each coil of the third phase band.

[0008] Preferably, the above-mentioned three-phase brushless DC motor has the following configuration: one first conductor is wound with at least two adjacent first phase coils in the same clockwise direction; one second conductor is wound with at least two adjacent second phase coils in the same clockwise direction; and one third conductor is wound with at least two adjacent third phase coils in the same clockwise direction.

[0009] Preferably, the above-mentioned three-phase brushless DC motor has the following configuration: At least two first conductors are provided, with one end of each first conductor initially wound into the winding post connected to a first lead-out terminal, and the other end of each first conductor initially unwound from the winding post connected to a second lead-out terminal; all first conductors are wound in the same direction. At least two second conductors are provided, with one end of each second conductor initially wound into the winding post connected to a third lead-out terminal, and the other end of each second conductor initially unwound from the winding post connected to a fourth lead-out terminal; all second conductors are wound in the same direction. At least two third conductors are provided, with one end of each third conductor initially wound into the winding post connected to a fifth lead-out terminal, and the other end of each third conductor initially unwound from the winding post connected to a sixth lead-out terminal; all third conductors are wound in the same direction. The number of first, second, and third conductors is the same.

[0010] The three-phase brushless DC motor described above preferably has m coils in each of the first, second and third phases, and n / m phases in each of the first, second and third phase windings, where m represents an integer not less than 1.

[0011] The three-phase brushless DC motor described above preferably includes a motor shaft, with the stator disposed on the inner side of the motor body and the rotor disposed on the outer side of the motor body.

[0012] In a second aspect, the present invention provides a fan including fan blades and the aforementioned three-phase DC brushless motor.

[0013] The aforementioned fan preferably includes a control board, which has six terminals, each of which is connected to the first to sixth lead-out terminals.

[0014] In a third aspect, the present invention provides a motor winding method for manufacturing the aforementioned three-phase brushless DC motor. The method includes: winding a coil on a winding post of a stator, the coil being evenly distributed at a predetermined angle in the circumferential direction to form at least two first phase bands, and drawing a first lead-out end and a second lead-out end from each of the first phase bands; winding a coil adjacent to the first phase bands, the coil being evenly distributed at a predetermined angle in the circumferential direction to form at least two second phase bands, and drawing a third lead-out end and a fourth lead-out end from each of the second phase bands; winding a coil adjacent to the second phase bands, the coil being evenly distributed at a predetermined angle in the circumferential direction to form at least two third phase bands; and drawing a fifth lead-out end and a sixth lead-out end from each of the third phase bands.

[0015] The preferred method for winding the motor described above further includes: winding two adjacent first phase bands in the same clockwise direction using a first conductor; winding two adjacent second phase bands in the same clockwise direction next to the first phase band into which the first phase band is first wound; winding two adjacent third phase bands in the same clockwise direction next to the second phase band into which the second phase band is first wound; wherein one end of each first conductor that first winds into the winding post is connected to a first lead-out end, and one end of each first conductor that first winds out of the winding post is connected to a second lead-out end; one end of each second conductor that first winds into the winding post is connected to a third lead-out end, and one end of each second conductor that first winds out of the winding post is connected to a fourth lead-out end; one end of each third conductor that first winds into the winding post is connected to a fifth lead-out end, and one end of each third conductor that first winds out of the winding post is connected to a sixth lead-out end.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention winds coils on the winding columns of the stator of an electric motor. The relative positions of the coils can form a first phase band, a second phase band, and a third phase band. Each of the first, second, and third phase bands is independently led out of the motor through two leads. In use, voltage can be applied to different leads to drive each phase winding, avoiding current leakage during the disconnection control time, thereby reducing motor heating, improving the efficiency of electromagnetic field generation, and ultimately improving the efficiency of the rotating motor.

[0018] The invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the winding connection structure in a three-phase brushless DC motor according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the stator winding structure in a three-phase brushless DC motor according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the stator equivalent circuit structure according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the first winding state structure of the stator according to an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the second winding state structure of the stator according to an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the third winding state structure of the stator according to an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the connection between a three-phase brushless DC motor and a control board according to an embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of the fan structure according to an embodiment of the present invention.

[0027] Reference numerals: 10, Stator; 11, First phase winding; 111, First phase strip; 112, First lead-out terminal; 113, Second lead-out terminal; 114, First conductor; 12, Second phase winding; 121, Second phase strip; 122, Third lead-out terminal; 123, Fourth lead-out terminal; 124, Second conductor; 13, Third phase winding; 131, Third phase strip; 132, Fifth lead-out terminal; 133, Sixth lead-out terminal; 134, Third conductor; 18, Winding post; 19, Coil; 20, Rotor; 30, Housing; 40, Motor shaft; 50, Fan blade; 60, Control board. Detailed Implementation

[0028] To better illustrate the objectives, technical solutions, and advantages of the present invention, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0029] like Figure 1As shown, an embodiment of the present invention provides a three-phase brushless DC motor, comprising a motor housing 30, a rotor 20, a stator 10, and a motor shaft 40. The rotor 20 is fixedly mounted on the housing 30, and the stator 10 is fixedly mounted on the motor shaft 40, which is rotatably mounted on the housing 30 about its central axis. The rotor 20 has a plurality of permanent magnet poles arranged circumferentially, with adjacent permanent magnet poles oriented in opposite polarities. The stator 10 has 3n winding posts 18 (n representing an integer not less than 2) arranged circumferentially, each winding post 18 having a coil 19 wound on it, forming a first phase winding 11, a second phase winding 12, and a third phase winding 13, respectively. The first phase winding 11 is formed by interconnecting n coils 19 and includes at least two first phase bands 111, which are angularly evenly distributed circumferentially. Each first phase band 111 has m coils 19 (m representing an integer not less than 1), and there are n / m first phase bands 111. All the coils 19 in the first phase bands 111 are electrically connected, and a first lead 112 and a second lead 113, i.e., terminals A and A' in the figure, are drawn from them. The first lead 112 and the second lead 113 are used to generate a consistent phase current in each of the first phase bands 111. When a voltage is applied to terminal A and terminal A' is grounded, each of the first phase bands 111 will form a consistent phase current, such as a clockwise current. At the same time, the consistent current can make each of the first phase bands 111 form a consistent magnetic field, such as a magnetic field with the N pole facing outward and the S pole facing inward. Similarly, when a voltage is applied to terminal A' and terminal A is grounded, the first phase bands 111 will form a consistent but opposite phase current and a consistent opposite magnetic field. The second phase winding 12 is formed by interconnecting n coils 19 and has n / m second phase bands 121. Each second phase band 121 has m coils 19. Each second phase band 121 is adjacent to the first phase band 111 and is evenly distributed angularly in the circumferential direction. All coils 19 in the second phase band 121 are electrically connected, and a third lead 122 and a fourth lead 123, i.e., terminals B and B' in the figure, are drawn from them. The third phase winding 13 is formed by interconnecting n coils 19 and has n / m third phase bands 131. Each third phase band 131 has m coils 19. Each third phase band 131 is adjacent to the second phase band 121 and is evenly distributed angularly in the circumferential direction. All coils 19 in the third phase band 131 are electrically connected, and a fifth lead 132 and a sixth lead 133, i.e., terminals C and C' in the figure, are drawn from them.

[0030] It is understood that in this embodiment, coils 19 are wound on the winding posts 18 of the stator 10 of the motor. The relative positions of the coils 19 can form a first phase band 111, a second phase band 121, and a third phase band 131. Each first phase band 111, each second phase band 121, and each third phase band 131 is independently led out of the motor through two leads. In use, voltage can be applied to different leads to drive each phase winding, avoiding current leakage during the disconnection control time, thereby reducing the heat generation of the motor, improving the efficiency of the electromagnetic field generation of the motor, and ultimately improving the efficiency of the rotating motor.

[0031] It is worth noting that the interconnection of all phase bands is to ensure that when a power is applied to terminals A and A', a consistent phase current is formed in each first phase band 111 (or second phase band 121, or third phase band 131). The winding direction of individual coils 19, the number of wires used, or the connection method between coils 19 can vary. For example, in two adjacent first phase bands 111, one may be clockwise, but the current in coil 19 may be clockwise when a voltage is applied to both terminals; conversely, if the other is clockwise, the current in coil 19 may also be clockwise when a voltage is applied to both terminals, yet the phase current in each phase band of the winding remains consistent.

[0032] like Figure 2As shown in the embodiment of the present invention, a three-phase brushless DC motor has a stator 10 with 12 winding posts 18, such as 1 to 12 winding posts 18. Each winding post 18 is wound with a coil 19. Each phase winding has 4 phase bands, and each phase band has one coil 19. The first phase winding 11 has first phase bands 111 marked a1, a2, a3, and a4, and each phase band has one coil 19, that is, each first phase band 111 is a coil 19 with 1, 4, 7, and 10 windings respectively. The coils 19 with 1 and 4 windings are wound by a first conductor 114. The first conductor 114 winds 1 winding post 18 clockwise from end a1 and exits from end a1', and continues to wind 2 winding post 18 clockwise from end a2 and exits from end a2'. When current flows from end a1 to end a1', coil 19 forms a clockwise phase current and generates a magnetic field with the N pole facing inward and the S pole facing outward on the winding post 18, thus forming a first phase band 111. As current continues to flow sequentially from end a1', end a2, and end a2', a clockwise phase current is also formed in coil 19, generating a magnetic field with the N pole facing inward and the S pole facing outward. Therefore, both coil 19 and coil 19 form first phase bands 111, and the phase current and magnetic field directions of each first phase band 111 are consistent. Similarly, coils 19 of lines 7 and 10 are wound from another first conductor 114. In coils 1, 4, 7, and 10, any two coils 19 are separated by two coils 19, such as two and three coils between lines 1 and 4. Therefore, each first phase band 111 is angularly evenly distributed circumferentially on the stator 10.

[0033] Continue to refer to Figure 2 Similarly, the second phase winding 12 also has four second phase bands 121, adjacent to each first phase band 111 in a clockwise direction, namely the coils 19 located at winding posts 18 in channels 2, 5, 8, and 11, respectively. Specifically, the coils 19 in channels 2 and 5 are wound sequentially in a clockwise direction by a single second conductor 124. Phase current flows in from end b1 and out from end b2', forming a consistent phase current and magnetic field in the coils 19 in channels 2 and 5. Similarly, the coils 19 in channels 8 and 11 are wound sequentially in a clockwise direction by another second conductor 124. Thus, the phase current and magnetic field of the four second phase bands 121 are also consistent.

[0034] Continue to refer to Figure 2Similarly, the third phase winding 13 also has four third phase bands 131, adjacent to each of the first phase bands 111 in a clockwise direction, namely the coils 19 located at winding posts 18 in channels 3, 6, 9, and 12, respectively. Specifically, the coils 19 in channels 3 and 6 are wound sequentially in a clockwise direction by a single third conductor 134. Phase current flows in from end c1 and out from end c2', forming a consistent phase current and magnetic field in the coils 19 in channels 3 and 6. Similarly, the coils 19 in channels 9 and 12 are wound sequentially in a clockwise direction by another third conductor 134. Thus, the phase current and magnetic field of the four third phase bands 131 are also consistent.

[0035] refer to Figure 3 One of the first conductors 114 is wound with two first phase bands 111, one with 1 turn and the other with 4 turns. The first terminal a1 of the first conductor 114 is connected to the first lead-out terminal 112, i.e., terminal A, and the first terminal a2' of the first conductor 114 is connected to the second lead-out terminal 113, i.e., terminal A'. When there is a phase current flowing from terminal A to terminal A', the first phase bands 111 of a1 and a2 both exhibit consistent phase current and magnetic field. The other first conductor 114 is wound with two first phase bands 111, one with 7 turns and the other with 10 turns. The end with 7 turns, i.e., terminal a3, is connected to terminal A, and the end with 10 turns, i.e., terminal a4', is connected to terminal A'.

[0036] Continue to refer to Figure 3 One of the second conductors 124 is wound with two second phase bands 121, one with 2 and the other with 5. The first two terminals (b1) of the second conductor 124 are connected to the third lead-out terminal 122 (B terminal), and the first five terminals (b2') of the second conductor 124 are connected to the fourth lead-out terminal 123 (B' terminal). When there is a phase current flowing from B terminal to B' terminal, the second phase bands 121 of b1 and b2 both exhibit consistent phase current and magnetic field. The other second conductor 124 is wound with two second phase bands 121, one with 8 and the other with 11. The end with 8 terminals (b3) is connected to B terminal, and the end with 11 terminals (b4') is connected to B' terminal.

[0037] Continue to refer to Figure 3One of the third conductors 134 is wound with two third phase bands 131, one with 3 turns and the other with 6 turns. The first terminal c1 of the third conductor 134, where the first 3 turns are wound, is connected to the third lead 122, i.e., the C terminal. The first terminal c2' of the third conductor 134, where the first 6 turns are wound, is connected to the fourth lead 123, i.e., the C' terminal. When there is a phase current flowing from the C terminal to the C' terminal, the third phase bands 131 of c1 and c2 both exhibit consistent phase current and magnetic field. The other third conductor 134 is wound with two third phase bands 131, one with 9 turns and the other with 12 turns. The end of the 9-turn band, i.e., the c3 terminal, is connected to the C terminal, while the end of the 12-turn band, i.e., the c4' terminal, is connected to the C' terminal.

[0038] like Figure 1 According to an embodiment of the present invention, a motor winding method is also provided for manufacturing the above-mentioned three-phase brushless DC motor. The method includes: winding a coil 19 on a winding post 18 of a stator 10, the coil 19 being evenly distributed at a predetermined angle in the circumferential direction to form at least two first phase bands 111, and drawing a first lead-out end 112 and a second lead-out end 113 from each of the first phase bands 111; winding the coil 19 adjacent to the first phase bands 111, the coil 19 being evenly distributed at a predetermined angle in the circumferential direction to form at least two second phase bands 121, and drawing a third lead-out end 122 and a fourth lead-out end 123 from each of the second phase bands 121; winding the coil 19 adjacent to the second phase bands 121, the coil 19 being evenly distributed at a predetermined angle in the circumferential direction to form at least two third phase bands 131; and drawing a fifth lead-out end 132 and a sixth lead-out end 133 from each of the third phase bands 131.

[0039] like Figures 4 to 6 As shown, according to one embodiment of the motor winding method, specifically, Figure 4 As shown, the first wire 114 is wound clockwise with one coil 19 and four coils 19 to form two adjacent first phase bands 111, namely the first phase bands 111 of a1 and a2. The a1 end is connected to the first lead-out end 112, and the a2' end is connected to the second lead-out end 113. Figure 5 As shown, after winding two adjacent first phase bands 111, the stator 10 can be rotated by a certain angle to wind two adjacent second phase bands 121. Two coils 19 and five coils 19 are wound clockwise sequentially using the second conductor 124 to form two adjacent second phase bands 121, namely the first phase bands 111 of b1 and b2. The b1 end is connected to the third lead-out end 122, and the b2' end is connected to the fourth lead-out end 123. Figure 6As shown, after winding two adjacent second phase bands 121, the stator 10 can be rotated by a certain angle to wind two adjacent third phase bands 131. Using the third conductor 134, three coils 19 and six coils 19 are wound clockwise sequentially to form two adjacent third phase bands 131, namely the first phase bands 111 of c1 and c2. The c1 end is connected to the third lead-out end 122, and the c2' end is connected to the fourth lead-out end 123. Thus, two adjacent three-phase windings can be wound sequentially using the same winding process. After winding, the stator 10 rotates half a turn, and using the same winding process, another six coils 19 can be wound, and the three-phase windings can be led out to six leads-out ends.

[0040] like Figure 7 As shown, a three-phase brushless DC motor according to an embodiment of the present invention is connected to a control board 60. The motor has a first to a sixth lead 133, namely lead A, lead B, lead C, lead A', lead B', and lead C', and each lead A, B, C, A', B', and lead C' is connected to one of the six terminals of the control board 60. The control board 60 can apply positive pressure from lead A to lead A', and positive pressure from lead A' to lead A; the control board 60 can apply positive pressure from lead B to lead B', and positive pressure from lead B' to lead B; the control board 60 can apply positive pressure from lead C to lead C', and positive pressure from lead C' to lead C.

[0041] like Figure 8 As shown, a fan according to an embodiment of the present invention includes the aforementioned three-phase brushless DC motor. The three-phase brushless DC motor has terminals A, B, C, A', B', and C' extending from three-phase windings in the stator 10. The three-phase windings generate a rotating magnetic field in the stator 10, causing the rotor 20, which has eight permanent magnets, to rotate, and driving the fan blades 50, which are housed in the housing 30, to rotate.

[0042] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0043] The above embodiments mainly describe the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A three-phase brushless DC motor comprising a motor body, characterized in that, The motor body includes: The rotor (20) has permanent magnet poles arranged along its circumference; The stator (10) has 3n winding posts (18) arranged along its circumference, where n represents an integer not less than 2; the first phase winding (11) includes a first phase strip (111) formed by coils (19) wound on the winding posts (18), and at least two of the first phase strips (111) are evenly distributed angularly in the circumferential direction; the second phase winding (12) includes a second phase strip (121) formed by coils (19) wound on the winding posts (18), and the number of second phase strips (121) is the same as that of the first phase strip. (111) are arranged in the same order and adjacent to the first phase band (111); and the third phase winding (13) includes a third phase band (131) formed by winding a coil (19) on a winding post (18), the number of the third phase bands (131) being the same as the number of the first phase bands (111) and adjacent to the third phase bands (131), each of the first phase bands (111), each of the second phase bands (121) and each of the third phase bands (131) being independently led out of the motor through two leads; The first phase winding (11) is provided with a first lead-out terminal (112) and a second lead-out terminal (113), which are used to generate a consistent phase current in each first phase band (111). The second phase winding (12) is provided with a third lead-out terminal (122) and a fourth lead-out terminal (123), which are used to generate a consistent phase current in each second phase band (121). The third phase winding (13) is provided with a fifth lead-out terminal (132) and a sixth lead-out terminal (133), which are used to generate a consistent phase current in each third phase band (131).

2. The three-phase brushless DC motor of claim 1, wherein, The first phase winding (11) includes a first conductor (114), the second phase winding (12) includes a second conductor (124), and the third phase winding (13) includes a third conductor (134); the first conductor (114) is wound on a winding post (18) to form a coil (19) of the first phase band (111), and the two ends of the first conductor (114) are electrically connected to the first lead-out end (112) and the second lead-out end (113) respectively, and flows through the first lead-out end (112) and the second lead-out end (114). 3) The phase current forms a magnetic field with the same direction in the coil (19) of each first phase band (111); the second conductor (124) is wound on the winding post (18) to form a coil (19) of the second phase band (121), and the two ends of the second conductor (124) are electrically connected to the third lead (122) and the fourth lead (123) respectively. The phase current flowing through the third lead (122) and the fourth lead (123) forms a magnetic field with the same direction in the coil (19) of each second phase band (121); The third conductor (134) is wound around the winding post (18) to form a coil (19) of the third phase band (131). The two ends of the third conductor (134) are electrically connected to the fifth lead (132) and the sixth lead (133) respectively. The phase currents of the fifth lead (132) and the sixth lead (133) form a magnetic field with the same direction in the coil (19) of each third phase band (131).

3. The three-phase brushless DC motor according to claim 2, characterized in that, One of the first conductors (114) is wound with coils (19) of at least two adjacent first phase bands (111) in the same clockwise direction; one of the second conductors (124) is wound with coils (19) of at least two adjacent second phase bands (121) in the same clockwise direction; and one of the third conductors (134) is wound with coils (19) of at least two adjacent third phase bands (131) in the same clockwise direction.

4. The three-phase brushless DC motor according to claim 3, characterized in that, The first wire (114) is provided with at least two wires. The first end of each first wire (114) that first winds into the winding post (18) is connected to the first lead end (112), and the first end of each first wire (114) that first winds out of the winding post (18) is connected to the second lead end (113). The winding direction of each first wire (114) is the same. The second conductor (124) is provided with at least two wires. The first end of each second conductor (124) that first winds into the winding post (18) is connected to the third lead end (122), and the first end of each second conductor (124) that first winds out of the winding post (18) is connected to the fourth lead end (123). The winding direction of each second conductor (124) is the same. At least two third conductors (134) are provided. The first end of each third conductor (134) that first winds into the winding post (18) is connected to the fifth lead-out end (132), and the first end of each third conductor (134) that first winds out of the winding post (18) is connected to the sixth lead-out end (133). The winding direction of each third conductor (134) is the same. The number of the first conductor (114), the second conductor (124), and the third conductor (134) is the same.

5. The three-phase brushless DC motor according to claim 1, characterized in that, Each of the first, second and third phase bands (131) is provided with m coils (19), and the first, second and third phase windings (13) are provided with n / m phase bands, where m represents an integer not less than 1.

6. The three-phase brushless DC motor according to claim 2, characterized in that, The motor body also includes a motor shaft (40), the stator (10) is disposed on the inner side of the motor body, and the rotor (20) is disposed on the outer side of the motor body.

7. A fan comprising fan blades (50) and a three-phase brushless DC motor as described in any one of claims 1 to 6.

8. The fan according to claim 7, characterized in that, It also includes a control board (60), which is provided with six terminals, which are respectively connected to the first to sixth leads (133).

9. A method for winding a motor, used to manufacture a three-phase brushless DC motor according to any one of claims 1 to 6, characterized in that, The method includes: A coil (19) is wound on the winding post (18) of the stator (10). The coil (19) is evenly distributed at a set angle in the circumferential direction and forms at least two first phase bands (111). A first lead-out end (112) and a second lead-out end (113) are drawn out from each first phase band (111). A coil (19) is wound close to the first phase band (111). The coil (19) is evenly distributed at a set angle in the circumferential direction and forms at least two second phase bands (121). A third lead (122) and a fourth lead (123) are drawn from each second phase band (121). A coil (19) is wound near the second phase band (121), and the coil (19) is evenly distributed at a set angle in the circumferential direction to form at least two third phase bands (131); a fifth lead (132) and a sixth lead (133) are drawn from each third phase band (131).

10. The motor winding method according to claim 9, characterized in that, The method further includes: winding two adjacent first phase bands (111) in the same clockwise direction using a first conductor (114); and winding two adjacent second phase bands (121) in the same clockwise direction next to the first phase band (111) into which the first phase band (111) is first wound. Next to the second phase band (121) into which the second phase band (121) is first wound, two adjacent third phase bands (131) are wound in the same clockwise direction using a third conductor (134); Wherein, the end of each first conductor (114) that first winds into the winding post (18) is connected to the first lead-out end (112), and the end of each first conductor (114) that first winds out of the winding post (18) is connected to the second lead-out end (113); the end of each second conductor (124) that first winds into the winding post (18) is connected to the third lead-out end (122), and the end of each second conductor (124) that first winds out of the winding post (18) is connected to the fourth lead-out end (123); the end of each third conductor (134) that first winds into the winding post (18) is connected to the fifth lead-out end (132), and the end of each third conductor (134) that first winds out of the winding post (18) is connected to the sixth lead-out end (133).

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