Brushless motor

Abstract

To provide a brushless motor which can easily connect a winding of a stator coil to an external circuit without a complex configuration.SOLUTION: A power supply structure comprises: winding pairs U1, U2, V1, V2, W1, W2 made of a first lead part of each winding and a second lead part of each winding in each phase; and a connection part 250 to which winding pairs U1, U2, V1, V2, W1, W2 are connected. Connection parts 250U, 250V, 250W of each phase are arranged at a position that is off-set to a predetermined direction as the same direction from a shaft core in view of a shaft direction, each of the winding pairs U1, U2, V1, V2, W1, W2 of each phase penetrates a penetration hole 231 of a bracket 230 in the shaft direction, and is extended up to each of the connection parts 250U, 250V, 250W along a front surface of the bracket 230 so as to be bent to the predetermined direction in an outer side end part of the shaft direction on the front surface side of the bracket 230.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to brushless motors. [Background technology]

[0002] Patent Document 1 discloses a brushless motor having a configuration in which the windings of a stator coil are connected to a drive circuit via an insertion hole formed in a center piece. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-193889 Summary of the Invention [Problem to be solved by the invention]

[0004] In the brushless motor described above, after forming the 12 windings, each winding must be passed through 12 insertion holes formed in the center piece to the drive circuit side, which makes assembly complicated and time-consuming.In addition, the connection points to the drive circuit are scattered over a wide area, which creates the problem of requiring a complex configuration to connect the windings to the drive circuit.

[0005] An object of the present disclosure is to provide a brushless motor that allows the windings of the stator coil to be easily connected to an external circuit and does not require a complex configuration. [Means for solving the problem]

[0006] In order to solve the above problem, one aspect of the present disclosure is to A motor body, a bracket to which the motor body is attached; a power supply structure for supplying power to the motor body through a through hole formed in the bracket; A brushless motor comprising: the bracket is provided to cover an axial end surface of the motor body, The motor body includes a stator, the stator includes a stator core having a plurality of teeth, a stator coil formed by windings wound around the plurality of teeth, and an insulator disposed between the stator core and the windings, the insulator includes a guide portion having a support member that guides or supports the winding, the support member corresponding to the through hole; The power supply structure includes: For each phase, Volume a first lead of the wire and Volume a winding pair comprising a second lead portion of the wire; a connection portion to which the first lead portion and the second lead portion are electrically connected, the connecting portions of the respective phases are disposed at positions offset in a predetermined direction that is the same direction from the axis center when viewed in the axial direction, a terminal holder fixed to the bracket, having the connection portion for each phase, and having insulating properties; the terminal holder includes a holder member provided opposite the through hole of the bracket and having at least one through hole formed therein for passing the winding pair therethrough; The winding pairs of each phase At least one winding pair passes through the guide portion and passes through the through hole of the bracket in the axial direction. and the through hole of the holder member in the axial direction. the remaining winding pairs of each phase pass through the guide portion and the through hole of the bracket in the axial direction; The bracket is bent in the predetermined direction at its outer end in the axial direction on the surface side thereof. 、 The aforementioned Holder parts a brushless motor extending along the surface of the motor to the connection portion. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a brushless motor in which the windings of the stator coil can be easily connected to an external circuit and which does not require a complex configuration. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a brushless motor according to a first embodiment. [Figure 1A] FIG. 2 is a perspective view showing the brushless motor with the bracket removed. [Figure 1B] FIG. 2 is a perspective view showing the configuration of a power supply structure and a stator; FIG. 3 is a perspective view showing the configuration of a power supply structure and a stator; [Figure 1C] FIG. 2 is a perspective view showing the vicinity of the power supply structure. [Figure 1D] FIG. 10 is a perspective view showing another form of guide. [Figure 2] FIG. [Figure 2A] FIG. 2 is a perspective view showing the configuration of a guide portion. [Figure 2B] FIG. 2 is a perspective view showing a cap member. [Figure 2C] FIG. 10 is a perspective view showing a state of the winding supported by the guide portion. [Figure 2D] FIG. 4 is a cross-sectional view showing the configuration in the vicinity of a guide portion. [Figure 3] FIG. 2 is a diagram showing the connection relationship of the windings of each coil. [Figure 3A] FIG. 2 is a diagram showing phases assigned to coils as viewed from the axial direction. [Figure 3B] FIG. 10 is a diagram showing the coil connection state (delta connection). [Figure 4] FIG. 10 is a perspective view showing the configuration of a fan device in which a brushless motor according to a second embodiment is used. [Figure 5] 1 is a perspective view showing a brushless motor according to an embodiment of the present invention; [Figure 6] FIG. 2 is a perspective view showing the brushless motor with the bracket removed. [Figure 6A] FIG. 2 is a perspective view showing the configuration of a power supply structure and a stator. [Figure 6B] FIG. [Figure 6C] FIG. 2 is a perspective view showing a cap member. [Figure 6D] FIG. 10 is a perspective view showing a state in which the winding is guided by a support member. [Figure 6E]10 is a diagram showing the positional relationship between the cap member and the winding when viewed from the axial direction. FIG. [Figure 7] FIG. 2 is a diagram showing the connection relationship of the windings of each stator coil. [Figure 7A] FIG. 2 is a diagram showing phases assigned to a stator coil as viewed from the axial direction. [Figure 7B] FIG. 10 is a diagram showing the coil connection state (delta connection). [Figure 8] FIG. 7 is an enlarged view of a portion of FIG. [Figure 8A] FIG. [Figure 8B] FIG. [Figure 9] FIG. 10 is a perspective view showing a method for drawing out the windings. [Figure 10] FIG. 10 is a perspective view showing a winding held by a terminal holder. [Figure 11] FIG. 2 is a perspective view showing a state in which a drive circuit is attached. [Figure 12] FIG. 10 is a perspective view showing another example of the configuration of the connection portion. [Figure 13] FIG. 10 is a perspective view showing another example of the configuration of the connection portion. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings.

[0010] (First Example) FIG. 1 is a perspective view of a brushless motor, FIG. 1A is a perspective view of the brushless motor with the bracket removed, FIG. 1B is a perspective view of the power supply structure and the stator, FIG. 1C is a perspective view of the power supply structure and its vicinity, FIG. 2 is a perspective view of an insulator, FIG. 2A is a perspective view of the guide section, FIG. 2B is a perspective view of a cap member, FIG. 2C is a perspective view of the windings supported by the guide section, and FIG. 2D is a cross-sectional view of the guide section and its vicinity. Note that for ease of explanation, some elements included in the configuration of FIG. 1 are omitted from FIGS. 1A to 2D. In the following description, circumferential, axial, and radial directions are defined with respect to the axis of the rotating shaft.

[0011] The brushless motor of this embodiment is a three-phase motor and is used, for example, as part of a device that drives a fan unit F (see FIG. 4). However, devices in which a brushless motor is used are not limited to this.

[0012] As shown in Figures 1 to 1B, the motor body of the brushless motor of this embodiment includes a stator 210 having multiple (12 in this embodiment) coils 11 arranged circumferentially, and a rotor 20 arranged on the outer periphery of the stator 210.

[0013] The stator 210 is configured by laminating steel plates in the axial direction and includes a stator core 13 having a plurality of (12 in this embodiment) teeth 13A that protrude outward in the circumferential direction. The plurality of coils 11 are configured by winding a winding 12 around each of the teeth 13A of the stator core 13. These coils 11 configure the stator coils of each phase.

[0014] 1B, insulator members 215A and 215B are interposed between winding 12 and stator core 13, and insulator members 215A and 215B insulate winding 12 from stator core 13. Insulator member 215A has inner peripheral portion 215a (FIGS. 2, 2A, and 2C) that extends radially inward beyond coil 11 and is formed into a cylindrical shape.

[0015] The rotor 20 is supported rotatably around a rotary shaft 21 (see FIG. 6). A fan unit F (see FIG. 4) is attached to the rotor 20. As shown in FIG. 1A, the brushless motor of this embodiment is configured as an outer rotor type motor in which the rotor 20 is disposed on the outer periphery of the stator 210. The stator 210 is fixed to an aluminum bracket 230 (see FIG. 1) provided so as to cover the axial end faces of the motor body (the stator 210 and the rotor 20). The rotor 20 is attached to the bracket 230 rotatably around the rotary shaft 21.

[0016] Six through holes 231 (FIG. 1) are formed in bracket 230 and spaced apart at equal angles (60°) around the axis. Winding 12 drawn out from coil 11 passes through these through holes 231 and passes through bracket 230 in the axial direction.

[0017] 1, a resin terminal holder TH is provided on the front side of bracket 230 and fastened to bracket 230. Terminal holder TH has through holes HV1, HV2, HU1, and HU2 (FIG. 1A) that face four of the six through holes 231, and a portion that forms connecting portion 250, which will be described later. Terminal holder TH has functions such as preventing contact between winding 12 and bracket 230 and ensuring insulation of winding 12.

[0018] This embodiment includes a guide portion 240 and a connection portion 250 as a power supply structure.

[0019] Six guide portions 240 are provided corresponding to through holes 231 of bracket 230, spaced apart at equal angles (60°) in the axial direction (see FIG. 1B). Guide portions 240 are intended to guide winding 12 so that winding 12 is drawn out through through holes 231 while ensuring insulation between winding 12 and bracket 230. Winding 12 passes through through holes 231 in the axial direction near a portion guided by guide portion 240 (an example of a first portion).

[0020] 1A, a winding pair U1 consisting of a lead portion U1a (an example of a first lead portion) of the winding 12 drawn out from one coil 11 and a lead portion U1b (an example of a second lead portion) of the winding 12 drawn out from the other coil 11 is guided or supported by a guide portion 240. Furthermore, the winding pair U1 passes through a through hole 231 and a through hole HU1 in the axial direction.

[0021] Similarly, a winding pair U2 consisting of a lead portion U2a of the winding 12 drawn out from one coil 11 and a lead portion U2b of the winding 12 drawn out from the other coil 11 is guided or supported by the guide portion 240. Furthermore, the winding pair U2 passes through the through hole 231 and the through hole HU2 in the axial direction.

[0022] Similarly, winding pair V1, consisting of lead portion V1a of winding 12 drawn out from one coil 11 and lead portion V1b of winding 12 drawn out from another coil 11, is guided or supported by guide portion 240, and winding pair V2, consisting of lead portion V2a of winding 12 drawn out from one coil 11 and lead portion V2b of winding 12 drawn out from another coil 11, is guided or supported by guide portion 240. Furthermore, winding pair V1 passes axially through through hole 231 and through hole HV1, and winding pair V2 passes axially through through hole 231 and through hole HV2.

[0023] Similarly, a winding pair W1 consisting of a lead portion W1a of the winding 12 drawn out from one coil 11 and a lead portion W1b of the winding 12 drawn out from another coil 11 is guided or supported by the guide portion 240, and a winding pair W2 consisting of a lead portion W2a of the winding 12 drawn out from one coil 11 and a lead portion W2b of the winding 12 drawn out from another coil 11 is guided or supported by the guide portion 240. Furthermore, the winding pair W1 and the winding pair W2 pass through the through hole 231 in the axial direction.

[0024] As will be described later, the winding pair U1 and the winding pair U2, the winding pair V1 and the winding pair V2, and the winding pair W1 and the winding pair W2 correspond to each of the three phases (U, V, W), and are connected to each other at a connection point 250.

[0025] Guide portion 240 includes support member 241 (FIGS. 2, 2A, and 2C) that supports or guides winding 12, and cap member 246 (FIGS. 2A, 2B, and 2C) that is fitted into support member 241. Note that in FIG. 2A, only one cap member 246 is shown, fitted into one support member 241.

[0026] As shown in FIG. 2, the support member 241 is configured as a part of the insulator member 215A, and is provided so as to protrude from the outer peripheral surface side of the inner peripheral portion 215a.

[0027] As shown in FIG. 2A, support member 241 has two recesses 242 that accommodate winding 12 in the axial direction. Recesses 242 are open in the circumferential direction, allowing winding 12 to be inserted through these openings. As shown in FIG. 2B, cap member 246 is formed in a U-shape when viewed axially, allowing it to fit into support member 241 from the outer periphery. Cap member 246 has two protrusions 247 that protrude toward the inner periphery and two claws 248 (only one is shown in FIG. 2B) that protrude in the circumferential direction. After winding 12 is inserted into recesses 242, cap member 246 is fixed by fitting cap member 246 into support member 241 from the outer periphery. At this time, winding 12 accommodated in recess 242 is supported by being pressed from the outer periphery by protrusions 247. At this time, the claws 248 of the cap member 246 engage with the support member 241, thereby preventing the cap member 246 from escaping to the outer periphery and coming off the support member 241.

[0028] As shown in FIG. 2C, the winding 12 (first lead portion or second lead portion) drawn out circumferentially from the coil 11 is routed along the inner peripheral portion 215a of the insulator member 215A to a predetermined position, and is guided to the corresponding guide portions 240 as winding pairs U1, U2, V1, V2, W1, W2, as described above.

[0029] During assembly, the winding 12 is routed along the inner circumferential portion 215a of the insulator member 215A up to the corresponding support member 241, and then the winding 12 is bent so as to fit into the recess 242 of the corresponding support member 241, whereby the winding 12 routed along the inner circumferential portion 215a of the insulator member 215A can be easily inserted into the recess 242.

[0030] In this embodiment, two recesses 242 are formed in each support member 241, and the recesses 242 are open toward the outer periphery. This allows the winding pairs U1, U2, V1, V2, W1, and W2 to be easily set in the recesses 242. Furthermore, the winding pairs U1, U2, V1, V2, W1, and W2 can be easily fixed in place simply by fitting the cap members 246 into the support members 241 from the outer periphery.

[0031] Furthermore, when the cap member 246 is fitted into the support member 241, a gap having a cross-sectional shape substantially identical to that of the winding 12 is formed between the cap member 246 and the support member 241. The winding 12 is accommodated in this gap, and the gap between the winding 12 and the guide portion 240 (the support member 241 and the cap member 246) is extremely small. As a result, the through-hole 231 is substantially blocked by the winding 12 passing through the guide portion 240 and the recess 242. This prevents leakage of the seal material S ( FIG. 2D ) used to block the through-hole 231 through the through-hole 231. The seal material S is applied to the area including the support member 241, the cap member 246, and the winding 12 when viewed from the axial direction. Because the through-hole 231 can be blocked by the seal material S in this way, the brushless motor of this embodiment can be applied to applications requiring airtightness and waterproofing. Furthermore, since the guide portion 240 is adhered to the bracket 230 by the seal material S, there is no risk of the guide portion 240 moving inadvertently.

[0032] 2D, tangent line L tangent to the surface of support member 241 and terminal holder TH in the cross section is configured not to come into contact with bracket 230. Also, while Fig. 2D shows the portion corresponding to winding pair V2, tangent lines tangent to the surface of support member 241 and terminal holder TH for all winding pairs U1, U2, V1, V2, W1, and W2 are configured not to come into contact with bracket 230. This prevents contact between winding pairs U1, U2, V1, V2, W1, and W2 and bracket 230, ensuring reliable electrical insulation of winding 12.

[0033] The terminal holder TH is also formed with two guides 253a extending radially outward from a cylindrical protrusion 253 that accommodates the rotating shaft 21. As shown in FIG. 1C, the guides 253a are used to secure the winding pairs W1 and W2 that have passed through the guide portion 240 and the through-hole 231 and route them along a predetermined path that avoids contact with other windings 12. The terminal holder TH is also formed with two guides 254 disposed near the connection portion 250. The guides 254 have an arc-shaped outer surface when viewed axially and serve to guide the winding pairs U1, U2, V1, V2, W1, and W2 that have passed through the through-hole 231 to appropriate positions leading to the respective connection portions 250U, 250V, and 250W. As shown in FIG. 1D, instead of the guides 253a, two guides 253b may be provided that protrude radially outward from a cylindrical protrusion 253A that accommodates the rotating shaft 21. In this case, by regulating the position of the winding pair W1, W2 with the guide 253b, the winding pair W1, W2 can be routed along a predetermined path that does not come into contact with other windings 12.

[0034] Fig. 3 shows the connection relationship of the windings of each coil, Fig. 3A shows the phases assigned to the coils as viewed from the axial direction, and Fig. 3B shows the connection state of the coils (delta connection). The arrangement order of the coils in Fig. 3 matches the arrangement order in the circumferential direction.

[0035] "U", "V", and "W" in FIGS. 3 and 3B represent the three phases U, V, and W, respectively.

[0036] The connection state of the windings 12 shown in Fig. 3 uses four coils 11 for each phase, and pairs of two coils 11 connected in series are drawn out to connection parts 250U, 250V, and 250W so that two are connected in parallel, forming a delta connection (Fig. 3B). In Fig. 3, connection points 5U, 5V, and 5W, to which two windings 12 are connected, correspond to connection parts 250U, 250V, and 250W, respectively, and the winding pairs (two windings 12) connected to connection points 5U, 5V, and 5W correspond to winding pair U1, U2, winding pair V1, V2, and winding pair W1, W2, which are connected to connection parts 250U, 250V, and 250W, respectively.

[0037] 3 shows the winding direction (clockwise and counterclockwise when viewing the coil 11 in the radial direction from the axis) of the winding 12 in each coil 11. Also, "Start" in FIG. 3 illustrates the winding start position of the winding 12.

[0038] As shown in Fig. 3A, four coils 11 are provided for each of the phases U, V, and W, and are arranged so that the arrangements of the phases U, V, and W are rotationally symmetrical with respect to each other around the rotation axis. Note that the "U," "V," and "W" attached to each coil 11 in Fig. 3 correspond to the "U," "V," and "W" attached to the coils 11 in Fig. 3A.

[0039] Next, the configuration of the connection section 250 will be described.

[0040] 1C, connecting portion 250 includes connecting portion 250U corresponding to the U phase, connecting portion 250V corresponding to the V phase, and connecting portion 250W corresponding to the W phase. Connecting portions 250U, 250V, and 250W are arranged in a straight line at positions offset from the axis.

[0041] Each of the connection parts 250U, 250V, and 250W is composed of a terminal 260 (FIG. 1C) having a slit (not shown) formed therein into which the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2 are press-fitted, and the insulating terminal holder TH described above that holds the terminal 260.

[0042] As shown in FIG. 1C, connecting portion 250U, connecting portion 250V, and connecting portion 250W each have four groove-shaped guides 252 formed therein to guide winding pairs U1 and U2, winding pairs V1 and V2, and winding pairs W1 and W2. The guides 252 house the distal ends of winding pairs U1 and U2, winding pairs V1 and V2, and winding pairs W1 and W2. Note that in FIG. 1C, the terminals 260 of connecting portion 250U and connecting portion 250W are removed to illustrate the configuration of the terminal holder TH. Also, FIG. 1C shows the guides 252 only for connecting portion 250U.

[0043] The shape of the terminal holder TH, which constitutes the connection portion 250, has projections and recesses corresponding to the shape of the terminal 260. When the terminal 260 is inserted, the terminal 260 is stably fixed to the terminal holder TH. When the winding pairs U1, U2, V1, V2, and W1, W2 are housed in the guide 252 and press-fitted into the terminal 260, the terminal 260 scrapes off the insulating coating of the winding 12, and the terminal 260 presses against the scraped-off winding 12 to electrically connect it. This simplifies the manufacturing process, as it allows the four windings 12 to be connected at one time without welding. Furthermore, it is possible to ensure electrical continuity between the winding pairs U1, U2, V1, V2, and W1, W2 and the terminal 260. Furthermore, the winding pairs U1, U2, V1, V2, and W1, W2 can be connected to the terminals 260 without using fusing or projection welding as the connecting means in the connecting portion 250.

[0044] Next, the steps of connecting the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2 to the connection portion 250U, the connection portion 250V, and the connection portion 250W will be described.

[0045] When the winding pairs U1, U2, V1, V2, and W1, W2, which are supported by the guide portion 240 and pass axially through the through-hole 231 (and, for the winding pairs U1, U2 and V1, V2, through-holes HU1, HU2 and HV1, HV2), are bent by approximately 90° at the bending portion 290 (FIG. 1B, an example of an axially outer end) at the axially outer end, the tip portions of the winding pairs U1, U2, V1, V2, and W1, W2 reach the corresponding connecting portions 250U, 250V, and 250W, respectively. When the tip portions of the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2 are inserted into the corresponding guides 252, the tip portions of the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2 are held in a state where they are accommodated within the guides 252.

[0046] Here, the lengths of winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 may be set so that the tip portions of each reach connecting portion 250 and excess length is suppressed. That is, the lengths of the portions (examples of second portions) from guide portion 240 to connecting portions 250U, 250V, and 250W corresponding to winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2, respectively, correspond to the distances from guide portion 240 to connecting portions 250U, 250V, and 250W corresponding to each winding pair. The lengths of these second portions differ depending on the distances from guide portion 240 to connecting portions 250U, 250V, and 250W corresponding to each winding pair. The lengths of the second portions of the winding pairs U1, U2, V1, V2, W1, and W2 are the same for the lead portions U1a, U2a, V1a, V2a, W1a, and W2a and the lead portions U1b, U2b, V1b, V2b, W1b, and W2b. This allows the winding pairs U1, U2, V1, V2, and W1, W2 to be arranged in a substantially straight line. This also prevents the winding pairs U1, U2, V1, V2, and W1, W2 from being connected to the wrong connection portions 250U, 250V, and 250W.

[0047] Next, when terminal 260 is fitted into terminal holder TH at connection portions 250U, 250V, and 250W, winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 are press-fit into the corresponding slits of terminal 260. At this time, the edges of the slits of terminal 260 peel off the insulating coatings of winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2, ensuring continuity between the conductors of winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 and the corresponding terminals 260. This establishes mutual conduction between winding pairs of the same phase, i.e., winding pairs U1 and U2, winding pairs V1 and V2, and winding pairs W1 and W2.

[0048] Next, the tip portions of the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2 are cut along the straight line 255, thereby removing the unnecessary tip portions of the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2. By removing the unnecessary portions of the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2, the brushless motor can be made lighter and more compact. Note that, as shown in FIG. 3, for a looped winding pair, such as the winding pair V1, V2, the tip of the loop can be cut along the straight line 255 after the loop is connected to the connecting portion 250V while maintaining its loop shape (see the second embodiment).

[0049] Furthermore, for example, the tip portions of the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2 may be accommodated in the holder terminal HT in an uncut state, and the step of cutting the winding 12 may be omitted.

[0050] As shown in FIGS. 1 to 1C, the winding pairs U1, U2, V1, V2, and W1, W2, i.e., winding pairs of different phases, do not intersect with each other when viewed from the axial direction. This prevents contact and electrical continuity between the winding pairs of different phases. Furthermore, insulating terminal holders TH are interposed between the winding pairs U1, U2, V1, V2, and W1, W2 and the bracket 230 over the entire area where the winding pairs U1, U2, V1, V2, and W1, W2 overlap with the bracket 230 in the axial direction. This prevents contact between the winding pairs U1, U2, V1, V2, and W1, W2 and ensures insulation between the bracket 230 and the winding pairs U1, U2, V1, V2, and W1, W2.

[0051] In this embodiment, by bending the winding pairs U1, U2, V1, V2, and W1, W2, which correspond to the twelve windings 12 drawn from the coil 11, in the same direction, the winding pairs for the three phases U, V, and W can be collectively connected to the corresponding connecting portions 250U, 250V, and 250W. In other words, the twelve windings 12 are consolidated into six winding pairs, and electrical continuity between the windings 12 constituting the winding pairs can be ensured without any laborious work. This improves the workability of connecting the windings 12 from the coil 11 to the connecting portions 250U, 250V, and 250W.

[0052] Furthermore, since the 12 windings 12 are connected together to the three connection parts 250U, 250V, and 250W for each phase, the work of connecting them to the drive circuit is easy, and the structure of the connection parts is not complicated.

[0053] (Second Example) Fig. 4 is a perspective view showing the configuration of a device using a brushless motor of the second embodiment, Fig. 5 is a perspective view showing the brushless motor of this embodiment, Fig. 6 is a perspective view showing the brushless motor with the bracket removed, Fig. 6A is a perspective view showing the configuration of the power supply structure and stator, Fig. 6B is a perspective view showing an insulator, Fig. 6C is a perspective view showing a cap member, Fig. 6D is a perspective view showing the state of the windings guided by a support member, and Fig. 6E is a diagram showing the positional relationship between the cap member and the windings when viewed from the axial direction. Note that for ease of explanation, some elements are omitted from each drawing.

[0054] As shown in Fig. 4, the brushless motor of this embodiment is a three-phase motor and is used, for example, as part of a device that drives a fan unit F (Fig. 4). However, devices in which a brushless motor is used are not limited to this.

[0055] As shown in FIG. 6A, the brushless motor of the second embodiment includes a stator 10 having a plurality of coils 11 (12 in this embodiment) arranged circumferentially, and a rotor 20 arranged on the outer periphery of the stator 10, as shown in FIG.

[0056] 6A, stator 10 is configured by laminating steel plates in the axial direction and includes stator core 13 having a plurality of (12 in this embodiment) teeth 13A protruding outward in the circumferential direction. Windings 12 are wound around each of teeth 13A of stator core 13 to form the plurality of coils 11. These coils 11 form the stator coils of each phase.

[0057] 6A, insulator members 15A and 15B are interposed between winding 12 and stator core 13, and insulator members 15A and 15B insulate winding 12 from stator core 13. Insulator member 15A has inner peripheral portion 15a (FIGS. 6A and 6B) that extends radially inward beyond coil 11 and is formed into a cylindrical shape.

[0058] The rotor 20 is supported rotatably around a rotary shaft 21 (FIG. 6). A fan unit F (FIG. 4) is attached to the rotor 20. As shown in FIG. 6, the brushless motor of this embodiment is configured as an outer rotor type motor in which the rotor 20 is disposed on the outer periphery of the stator 10.

[0059] The stator 10 is fixed to an aluminum bracket 30 (FIG. 5) provided so as to cover the axial end face of the motor body M (the stator 10 and the rotor 20). The rotor 20 is attached to the bracket 30 so as to be rotatable around a rotation axis 21.

[0060] Six through holes 31 are formed in the bracket 30 and are spaced apart at equal angles (60°) around the axis. The windings 12 drawn out from the coil 11 pass through the bracket 30 via these through holes 31.

[0061] This embodiment includes a guide portion 40 and a connection portion 50 as a power supply structure.

[0062] Six guide portions 40 are provided, spaced apart at equal angles (60°) around the axis, corresponding to the through holes 31 of the bracket 30. The guide portions 40 are intended to draw out the winding 12 through the through holes 31 while ensuring insulation between the winding 12 and the bracket 30. The winding 12 passes through the through holes 31 in the axial direction at a portion guided by the guide portions 40.

[0063] As shown in FIG. 6A, a winding pair U1 consisting of a lead portion U1a (an example of a first lead portion) of the winding 12 drawn out from one coil 11 and a lead portion U1b (an example of a second lead portion) of the winding 12 drawn out from the other coil 11 is guided or supported by a guide portion 40.

[0064] Similarly, a winding pair U2 consisting of a lead portion U2a of the winding 12 drawn out from one coil 11 and a lead portion U2b of the winding 12 drawn out from the other coil 11 is guided or supported by a guide portion 40.

[0065] Similarly, a winding pair V1 consisting of a lead portion V1a of the winding 12 drawn out from one coil 11 and a lead portion V1b of the winding 12 drawn out from another coil 11 is guided or supported by the guide portion 40, and a winding pair V2 consisting of a lead portion V2a of the winding 12 drawn out from one coil 11 and a lead portion V2b of the winding 12 drawn out from the other coil 11 is guided or supported by the guide portion 40.

[0066] Similarly, a winding pair W1 consisting of a lead portion W1a of the winding 12 drawn out from one coil 11 and a lead portion W1b of the winding 12 drawn out from another coil 11 is guided or supported by the guide portion 40, and a winding pair W2 consisting of a lead portion W2a of the winding 12 drawn out from one coil 11 and a lead portion W2b of the winding 12 drawn out from the other coil 11 is guided or supported by the guide portion 40.

[0067] As will be described later, the winding pair U1 and the winding pair U2, the winding pair V1 and the winding pair V2, and the winding pair W1 and the winding pair W2 correspond to each of the three phases (U, V, W), and are connected to each other at a connection point 50.

[0068] The guide portion 40 includes a support member 41 (FIG. 6B) that supports or guides the winding 12, and a cap member 46 that is fitted onto the support member 41.

[0069] As shown in FIG. 6B, the support member 41 is configured as a part of the insulator member 15A, and is provided so as to protrude from the outer peripheral surface side of the inner peripheral portion 15a (FIGS. 6A and 6B).

[0070] 6B, support member 41 has two recesses 42 that axially accommodate winding 12, and arc-shaped protrusions 43 when viewed from the radially outer periphery. Recesses 42 are open in the circumferential direction, and winding 12 can be inserted through these openings.

[0071] 6D, the winding 12 (first lead portion or second lead portion) drawn out in the circumferential direction from the coil 11 is bent around the protrusion 43 in accordance with the arc shape of the protrusion 43. Furthermore, the winding 12 that has wound around the protrusion 43 is drawn out in the axial direction via the recess 42.

[0072] As shown in FIG. 6D, protrusions 44 may be provided on the outer periphery of inner periphery 15a to guide the axial position of winding 12 wound around inner periphery 15a.

[0073] Cap member 46 (FIG. 6C) is fitted into support member 41 to close the opening of recess 42, thereby accommodating winding 12 inside recess 42. As shown in FIG. 6C, cap member 46 is formed with a through-hole 47 through which winding 12 drawn out in the axial direction passes.

[0074] Furthermore, since the winding 12 is housed between the through-hole 47 and the recess 42, the gap between the winding 12 and the guide portion 40 is extremely small. Furthermore, the cap member 46 is attached in a state in which it closes the through-hole 31. As a result, the through-hole 31 is essentially closed by the winding 12 passing through the guide portion 40 and the recess 42. This prevents the seal material used to close the through-hole 31 from leaking through the through-hole 31. The seal material is applied to an area that includes the support member 41, the cap member 46, and the winding 12 when viewed from the axial direction. Because the through-hole 31 can be closed with the seal material in this way, the brushless motor of this embodiment has improved airtightness and can be used in cases where waterproofing is required.

[0075] Furthermore, a protrusion 48 (FIG. 6C) that protrudes in the axial direction is formed on a part of the open end of the through-hole 47.

[0076] FIG. 7 is a diagram showing the connection relationship of the windings of each coil, FIG. 7A is a diagram showing the phases assigned to the coils as viewed from the axial direction, and FIG. 7B is a diagram showing the connection state of the coils (delta connection).

[0077] 7 to 7B, "U," "V," and "W" represent the three phases U, V, and W, respectively.

[0078] In this embodiment, a winding machine can be used to wind continuous windings 12 around all of the teeth 13A. That is, winding of the windings 12 around the teeth 13A, including the winding pairs U1, U2, V1, V2, W1, and W2, and wiring between the teeth 13A can be completed automatically without cutting the windings 12.

[0079] The connection state of the windings 12 shown in Fig. 7 uses four coils 11 for each phase, and pairs of two coils 11 connected in series are drawn out to the connection parts 50U, 50V, and 50W so that two are connected in parallel, forming a delta connection (Fig. 7B). In Fig. 7, connection points 5U, 5V, and 5W, to which two windings 12 are connected, correspond to the connection parts 50U, 50V, and 50W, respectively, and the winding pairs (two windings 12) connected to the connection points 5U, 5V, and 5W correspond to the winding pairs U1 and U2, winding pairs V1 and V2, and winding pairs W1 and W2, which are connected to the connection parts 50U, 50V, and 50W, respectively.

[0080] 7 indicates the winding direction of the winding 12 in each coil 11 (clockwise and counterclockwise directions when viewing the coil 11 in the radial direction from the axis). Also, "start" indicates the start position of the winding of the winding 12.

[0081] As shown in Fig. 7A, four coils 11 are provided for each of the phases U, V, and W, and are arranged so that the arrangements of the phases U, V, and W are rotationally symmetrical with respect to one another around the axis of the rotating shaft 21. Note that the "U," "V," and "W" attached to each coil 11 in Fig. 7 correspond to the "U," "V," and "W" attached to the coils 11 in Fig. 7A.

[0082] On the other hand, the positions of the through holes 31 in the bracket 30 corresponding to the winding pairs U1, U2, V1, V2, and W1, W2 are not rotationally symmetric for each phase, but are arranged counterclockwise in the order of winding pair W1 → winding pair V1 → winding pair V2 → winding pair W2 → winding pair U2 → winding pair U1 in FIG. 6A.

[0083] Therefore, in order to make the winding 12 drawn out from the coil 11 correspond to the positions of the winding pairs U1 and U2, the winding pairs V1 and V2, and the winding pairs W1 and W2, it is necessary to cross the winding 12 in the U phase and the V phase with crossover wires between the coil 11 and the guide portion 40.

[0084] In this regard, in this embodiment, the winding 12 can be routed in both directions around the axis along the outer circumferential surface of the inner circumferential portion 15a (FIGS. 6A and 6B). Furthermore, as shown in FIG. 6D, the winding 12 routed along the outer circumferential surface of the inner circumferential portion 15a (FIGS. 6A and 6B) can be bent along the arc-shaped convex portions 43 of the corresponding guide portions 40, thereby allowing the winding 12 to be guided into the predetermined through-holes 31. Therefore, even if the arrangement of the phases of the coil 11 does not match the positional relationships of the winding pairs U1 and U2, the winding pairs V1 and V2, and the winding pairs W1 and W2, the winding 12 can be properly routed and guided into the predetermined through-holes 31 (guide portions 40). Furthermore, automatic routing by a winding machine can be applied to the process of routing the winding 12, thereby reducing the number of steps required for forming the winding 12.

[0085] Next, the configuration of the connection portion 50 will be described.

[0086] 8 is an enlarged portion of FIG. 6, FIGS. 8A and 8B are perspective views showing the terminal, FIG. 9 is a perspective view showing a method for drawing out the winding, and FIG. 10 is a perspective view showing the winding held in the terminal holder.

[0087] 8, the connection portion 50 includes a connection portion 50U corresponding to the U phase, a connection portion 50V corresponding to the V phase, and a connection portion 50W corresponding to the W phase. The connection portions 50U, 50V, and 50W are arranged in a straight line at positions offset from the axis.

[0088] Each of connection parts 50U, 50V, and 50W includes a terminal 60 having a slit portion 61 (FIGS. 8A and 8B) with slits 61a-61h into which winding pairs U1, U2, V1, V2, and W1, W2 are press-fitted, and an insulating terminal holder 51 that holds the terminal 60. The terminal holders 51 of connection parts 50U, 50V, and 50W are formed of a common insulating holder member 51A. As shown in FIG. 5, holder member 51A is attached to the surface of bracket 30, and its insulating properties ensure insulation between terminal 60 and bracket 30.

[0089] As shown in Fig. 8, the terminal holders 51 of the connection parts 50U, 50V, and 50W each have four groove-shaped guides 52 formed therein to guide the winding pairs U1 and U2, the winding pairs V1 and V2, and the winding pairs W1 and W2. As shown in Fig. 8, the guides 52 house the distal ends of the winding pairs U1 and U2, the winding pairs V1 and V2, and the winding pairs W1 and W2. Note that in Fig. 8, the terminal 60 of the connection part 50U is removed to illustrate the configuration of the terminal holders 51. Also, Fig. 5 shows the guides 52 only for the terminal holder 51 of the connection part 50U.

[0090] 8, terminal holders 51 of connection parts 50U, 50V, and 50W are provided with claws 53 for temporarily holding winding pairs U1, U2, V1, V2, and W1, W2, respectively. Claws 53 have grooves located on the extensions of guides 52, and engage with the tips of winding pairs U1, U2, V1, V2, and W1, W2 housed in these grooves. Thus, claws 53 function to temporarily hold the tips of winding pairs U1, U2, V1, V2, and W1, W2.

[0091] Although the diameter of winding 12 is not limited, if the diameter of winding 12 is large, for example, if the diameter is 1 mm or more, winding pair U1, U2, winding pair V1, V2, and winding pair W1, W2 become stiff, making it difficult to accommodate them in guide 52 without temporary holding. However, in this embodiment, the positions of winding pair U1, U2, winding pair V1, V2, and winding pair W1, W2 are fixed by claws 53, so winding pair U1, U2, winding pair V1, V2, and winding pair W1, W2 can be correctly positioned in guide 52.

[0092] 8A and 8B is made of a conductive metal and has eight slits 61a to 61h. Terminal 60 also has terminal portions 62 to which output terminals of each phase of the drive circuit are connected.

[0093] 8 to 8B, the shape of terminal holder 51 has projections and recesses corresponding to the shape of terminal 60, and when terminal 60 is inserted into terminal holder 51, terminal 60 is stably fixed to terminal holder 51. Furthermore, since winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 are press-fitted into terminal 60 while housed within guide 52, electrical continuity between terminal 60 and winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 can be ensured.

[0094] In this embodiment, the winding pairs U1, U2, V1, V2, and W1, W2 are connected to the terminals 60 by being press-fitted into the slits 61a-61h. When press-fitted into the terminals 60, the terminals 60 scrape away the insulating coating of the windings 12, and the terminals 60 are then pressed into contact with the scraped-off windings 12 to electrically connect them. This simplifies the manufacturing process, as all four windings 12 can be connected at once without welding. Furthermore, there is no need to use fusing or projection welding. Furthermore, the winding pairs U1, U2, V1, V2, and W1, W2 can be connected to the terminals 60 without using electrodes made of heat-resistant tungsten.

[0095] Next, the steps of connecting the winding pairs U1 and U2, V1 and V2, and W1 and W2 to the connection parts 50U, 50V, and 50W will be described.

[0096] As shown in Fig. 9, before being connected to connecting parts 50U, 50V, and 50W, the windings 12 constituting winding pairs U1, U2, V1, V2, and W1, W2 are not cut but are formed into continuous loops, and are pulled out upward in Fig. 9 via support member 41. All of the wiring steps for winding 12 up to the step shown in Fig. 4 can be performed using a winding machine.

[0097] In this state, by passing the winding pairs U1, U2, V1, V2, and W1, W2 through the through-holes 47 of the cap member 46 and fitting the cap member 46 into the support member 41, the first portions of the winding pairs U1, U2, V1, V2, and W1, W2, i.e., the portions that pass through the through-holes 31, are fixed by the guide parts 40. In this state, the winding pairs U1, U2, V1, V2, and W1, W2 can be passed through the through-holes 31 of the bracket 30.

[0098] Next, when winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 are bent approximately 90° to the right in FIG. 9 at bending portions 90 at the axially outer ends (FIG. 5, an example of an axially outer end), the tip portions of winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 reach corresponding connecting portions 50U, 50V, and 50W, respectively. As shown in FIG. 10, when the tip portions of winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 are inserted into corresponding guides 52 and engaged with the grooves of claws 53, the tip portions of winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 are held within guides 52 by claws 53.

[0099] The lengths of the winding pairs U1, U2, V1, V2, and W1, W2 are set so that the tip portions of each pair reach the connection portion 50 and so that excess length is suppressed. That is, the lengths of the portions (an example of a second portion) from the guide portion 40 to the connection portions 50U, 50V, and 50W corresponding to the winding pairs U1, U2, V1, V2, and W1, W2, respectively, correspond to the distances from the guide portion 40 to the connection portions 50U, 50V, and 50W corresponding to the respective winding pairs. The lengths of the second portions differ depending on the distances from the guide portion 40 to the connection portions 50U, 50V, and 50W corresponding to the respective winding pairs. The lengths of the second portions of the winding pairs U1, U2, V1, V2, W1, and W2 are the same for the lead portions U1a, U2a, V1a, V2a, W1a, and W2a and the lead portions U1b, U2b, V1b, V2b, W1b, and W2b. Therefore, as will be described later, the winding pairs U1, U2, V1, V2, and W1, W2 are arranged in a substantially straight line. This also eliminates the risk of connecting the winding pairs U1, U2, V1, V2, and W1, W2 to the wrong connecting portions 50U, 50V, and 50W.

[0100] Next, when terminals 60 are fitted into terminal holders 51 of connecting portions 50U, 50V, and 50W, winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 are press-fit into corresponding slits 61a-61h. At this time, the edges of slits 61a-61h peel off the insulating coatings of winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2, ensuring continuity between the conductors of winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 and the corresponding terminals 60. This establishes mutual conduction between winding pairs of the same phase, i.e., winding pairs U1 and U2, winding pairs V1 and V2, and winding pairs W1 and W2.

[0101] Next, by cutting the tip portions of the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2 along the straight line 55A or the straight line 55B, it is possible to remove the unnecessary tip portions of the loop-shaped winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2.

[0102] As shown in Fig. 6A, the winding pairs U1 and U2, V1 and V2, and W1 and W2 are arranged so that they extend substantially linearly and parallel to one another. Therefore, winding pairs of different phases do not cross each other when viewed from the axial direction. This prevents contact and electrical conduction between winding pairs of different phases.

[0103] In this embodiment, by bending the winding pairs U1, U2, V1, V2, and W1, W2, which correspond to the twelve windings 12 drawn from the coil 11, in the same direction, the winding pairs for the three phases U, V, and W can be collectively connected to the terminals 60 of the corresponding connecting parts 50U, 50V, and 50W. In other words, the twelve windings 12 are consolidated into six winding pairs, and electrical continuity between the windings 12 constituting the winding pairs can be ensured without any laborious work. This improves the workability of connecting the windings 12 drawn from the coil 11 to the terminals 60.

[0104] Furthermore, since the 12 windings 12 are collectively connected to the three connection parts 50U, 50V, and 50W for each phase, the work of connecting them to the drive circuit is simplified, and the configuration of the connection parts is not made complicated.

[0105] Next, as shown in FIG. 11, drive circuit board 101 on which a drive circuit is mounted is attached together with cover C (FIG. 4) above bracket 30 in FIG. 10. At this time, U, V, and W three-phase output terminals (not shown) pulled out from or mounted on drive circuit board 101 are fitted and connected to terminal portions 62 of terminals 60 of connection portions 50U, 50V, and 50W for each phase. In this state, winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 are accommodated in the gaps secured between bracket 30 and drive circuit board 101. Note that members for ensuring insulation may be inserted between drive circuit board 101 and winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2.

[0106] 11, in this embodiment, the drive circuit board 101 and the connection portion 50 are attached in areas separated from each other when viewed in the axial direction. This prevents interference between the drive circuit board 101 and the connection portion 50 and reduces the axial height of the cover C.

[0107] 11, a connection module 102 (FIG. 4) is provided near the drive circuit board 101, and power is supplied to the drive circuit board 101 via the connection module 102, and an input signal for controlling the output of the three phases U, V, and W is also provided. Therefore, the drive circuit can be mounted within the drive circuit board 101 so that signals and power flow in one direction, from the connection module 102 side to the connection unit 50 side. This allows the circuit pattern to be streamlined, thereby making it possible to reduce the size of the drive circuit board 101. Furthermore, the drive circuit can be simplified because the three-phase outputs from the drive circuit can be output horizontally in accordance with the arrangement of the connection units 50U, 50V, and 50W.

[0108] (Third Example) 12 and 13 are perspective views showing other configuration examples of the connection portion.

[0109] 12, the connection portion 150 includes a connection portion 150U corresponding to the U phase, a connection portion 150V corresponding to the V phase, and a connection portion 150W corresponding to the W phase. The connection portions 150U, 150V, and 150W are arranged in a straight line at positions offset from the axis.

[0110] Each of connection parts 150U, 150V, and 150W includes a terminal 160 having a slit portion with slits (corresponding to slits 61a-61h) into which winding pairs U1 and U2, winding pairs V1 and V2, and winding pairs W1 and W2 are press-fitted, and an insulating terminal holder 151 that holds terminal 160. The terminal holders 151 of connection parts 150U, 150V, and 150W are formed of a common insulating holder member 151A. Holder member 151A is attached to the surface of bracket 30 via mounting screws 157, and its insulating properties ensure insulation between terminal 160 and bracket 30.

[0111] The holder member 151A is also formed with a through hole 155U for passing the winding pair U1, a through hole 155V for passing the winding pair V1, and a through hole 155W for passing the winding pair W1. The through holes 155U, 155V, and 155W are provided opposite the corresponding through holes 31.

[0112] Furthermore, the holder member 151A is formed with a hook portion FU that supports the winding pair U2, a hook portion FV that supports the winding pair V2, and a hook portion FW that supports the winding pair W2, thereby fixing the position of the winding pair U2, V2, W2, which is extended longer than the winding pair U1, V1, W1.

[0113] As shown in Fig. 12, terminal holders 151 of connection parts 150U, 150V, and 150W are each formed with four groove-shaped guides (corresponding to guides 52) that guide winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2. As shown in Fig. 9, the guides house the tip portions of winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2.

[0114] 12, terminal holders 151 of connection parts 150U, 150V, and 150W are provided with claws 153 (corresponding to claws 53) for temporarily holding winding pairs U1 and U2, winding pairs V1 and V2, and winding pairs W1 and W2, respectively. Claws 153 have the function of temporarily holding the tips of winding pairs U1 and U2, winding pairs V1 and V2, and winding pairs W1 and W2.

[0115] Terminal 160 is made of a conductive metal and has eight slits (corresponding to slits 61a to 61h). Terminal 160 also has male terminal portions 162 to which output terminals of each phase of the drive circuit are connected.

[0116] Here, in a plane perpendicular to the axial direction, terminal portion 162 does not rise from the region of the slit portion (corresponding to slit portion 61) where the slit is formed, but is provided at a position outside this region. This makes it possible to reduce the height (height in the axial direction) of terminal portion 162, and, for example, the space required for connection can be reduced.

[0117] 12, the shape of terminal holder 151 has projections and recesses corresponding to the shape of terminal 160, and when terminal 160 is inserted into terminal holder 151, terminal 160 is stably fixed to terminal holder 151. Furthermore, since winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 are press-fitted into terminal 160 while housed in guides (corresponding to guide 52), electrical continuity between terminal 160 and winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 can be ensured.

[0118] In this embodiment, the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2 are connected to the terminal 160 by being press-fitted into the slits. This eliminates the need for fusing or projection welding. This allows the winding pair U1, U2, the winding pair V1, V2, and the winding pair W1, W2 to be connected to the terminal 160 without using electrodes made of heat-resistant tungsten material.

[0119] The process of connecting winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 to connection portions 150U, 150V, and 150W is similar to the process of connecting winding pairs U1, U2, winding pairs V1, V2, and winding pairs W1, W2 to connection portions 50U, 50V, and 50W.

[0120] The example in FIG. 13 shows an example in which only the winding pair U1, V1, and W1 are connected to the connecting portion 150U, the connecting portion 150V, and the connecting portion 150W, respectively. In other words, there is no winding pair U2, V2, and W2 to be connected to the connecting portion 150U, the connecting portion 150V, and the connecting portion 150W. As shown in FIG. 13, even in this case, the same holder member 151A as in the example in FIG. 12 can be used. However, instead of using the holder member 151A, a holder member that omits the components corresponding to the winding pair U2, V2, and W2 may be used. For example, the hook portions FU, FV, and FW may be omitted. Furthermore, the shape of the terminal holder 151 (the shape of the groove-shaped guide (corresponding to the guide 52) and the claw portion 153) or the shape of the terminal 160 (e.g., the number of slits) may be shaped to correspond only to the winding pair U1, V1, and W1.

[0121] Although the embodiments have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the claims. In addition, it is also possible to combine all or a plurality of components of the above-described embodiments.

[0122] The following additional notes are provided regarding the above-described embodiments.

[0123] [Appendix 1] A motor body (M), a bracket (30, 230) to which the motor body is attached; a power supply structure (40, 50, 150, 240, 250) for supplying power to the motor body through a through hole (31, 231) formed in the bracket; A brushless motor comprising: the bracket is provided to cover an axial end surface of the motor body, The motor body includes a stator (10, 210), The stator includes a stator core (13) having a plurality of teeth (13A) and a stator coil (11) formed by windings (12) wound around the plurality of teeth, The power supply structure includes: For each phase, a winding pair (U1, U2, V1, V2, W1, W2) consisting of first lead portions (U1a, U2a, V1a, V2a, W1a, W2a) of the winding and second lead portions (U1b, U2b, V1b, V2b, W1b, W2b) of the winding; guide portions (40, 240) for guiding each of the winding pairs; a connection portion (50U, 50V, 50W, 150U, 150V, 150W, 250U, 250V, 250W) to which the first lead portion and the second lead portion are electrically connected, The winding pair includes: a first portion guided by the guide portion; a second portion bent from an axially outer end of the first portion in a direction along the surface of the bracket, the first portion passes through the through hole in the axial direction, The second portion of the brushless motor extends to the connection portion.

[0124] According to the configuration of Supplementary Note 1, the winding pair passes through the through-hole in the axial direction at the first portion guided by the guide portion, and is further bent in a direction along the surface of the bracket, and the first lead portion and the second lead portion are connected to the connection portion in a state where they are electrically connected to the connection portion. In this way, a guide portion is provided for each winding pair, and each winding pair is connected to the connection portion, which makes it possible to streamline the assembly work and simplify the configuration required for connection.

[0125] [Appendix 2] The power supply structure includes: For each phase, A plurality of the winding pairs; A plurality of the guide portions; Equipped with 2. A brushless motor according to claim 1, wherein the first lead portion and the second lead portion of the plurality of winding pairs are both electrically connected to the common connecting portion.

[0126] According to the configuration of Supplementary Note 2, the first and second lead portions of the multiple winding pairs are all electrically connected to a common connection portion, so the connection portions can be grouped together for each phase. This reduces the number of connection portions, making assembly easier.

[0127] [Appendix 3] 3. A brushless motor according to claim 1, wherein the pair of windings corresponding to one phase and the pair of windings corresponding to another phase do not intersect with each other in the second region when viewed from the axial direction.

[0128] According to the configuration of Supplementary Note 3, conduction between windings corresponding to different phases can be prevented.

[0129] [Appendix 4] A brushless motor according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the length of the second portion is the same for the first lead portion and the second lead portion, and is different for each of the winding pairs.

[0130] According to the configuration of Supplementary Note 4, the second portions of each winding pair can be arranged linearly.

[0131] [Appendix 5] 5. The brushless motor according to claim 4, wherein the length of the second portion corresponds to the distance from the corresponding guide portion to the connection portion.

[0132] According to the configuration of Supplementary Note 5, the second portions of each winding pair can be arranged linearly.

[0133] [Appendix 6] the brushless motor is a three-phase motor, The bracket is formed with a plurality of through holes corresponding to the respective phases, The power supply structure includes: a plurality of the guide portions corresponding to the through holes, three connection parts corresponding to the three phases, 3. The brushless motor according to claim 2, wherein the winding pairs of each phase are connected to the connection portions of each phase.

[0134] According to the configuration of Supplementary Note 6, a pair of windings passes through each through-hole, and the pairs of windings are gathered into three connection portions.

[0135] [Appendix 7] 7. The brushless motor according to any one of claims 1 to 6, wherein the connection portions of each phase are arranged linearly at positions offset from the shaft center.

[0136] According to the configuration of Supplementary Note 7, the plurality of connecting portions are arranged linearly at positions offset from the shaft center, so that space can be secured near the shaft center.

[0137] [Appendix 8] The connection portion is a terminal having slits into which the first lead portion and the second lead portion are press-fitted; an insulating terminal holder for holding the terminal; 2. The brushless motor of claim 1, comprising:

[0138] According to the configuration of Appendix 8, the terminal has slits into which the first lead portion and the second lead portion are press-fitted, so that the first lead portion and the second lead portion can be connected to the terminal without using fusing, projection welding, etc.

[0139] [Appendix 9] 9. The brushless motor according to claim 8, wherein the terminal holder is formed with a groove-shaped guide for guiding the first lead portion and the second lead portion.

[0140] According to the configuration of Supplementary Note 9, the first lead portion and the second lead portion are guided by the guide, so that the first lead portion and the second lead portion can be stably press-fitted into the slit.

[0141] [Appendix 10] 10. The brushless motor according to claim 8 or 9, wherein the terminal holder is attached to a surface of the bracket.

[0142] According to the configuration of Supplementary Note 10, the terminal holder insulates the terminal from the bracket.

[0143] [Appendix 11] The brushless motor according to any one of Supplementary Note 8 to Supplementary Note 10, wherein the terminal is provided for each phase, and the terminal holder for each phase is configured by a common holder member (TH, 51A, 151A).

[0144] According to the configuration of Supplementary Note 11, the terminal holder can be configured from a single member.

[0145] [Appendix 12] A method for manufacturing a brushless motor, comprising: The brushless motor is A motor body, a bracket to which the motor body is attached; a power supply structure for supplying power to the motor body through a through hole formed in the bracket; A brushless motor comprising: the bracket is provided to cover an axial end surface of the motor body, The motor body includes a stator, the stator includes a stator core having a plurality of teeth and a stator coil formed by windings wound around the plurality of teeth; The method for manufacturing the brushless motor includes: a step of passing a winding pair, each of which is provided for each phase and includes a first lead portion of the winding and a second lead portion of the winding, through the through hole in the axial direction; bending the winding pair that has passed through the through hole in a direction along the surface of the bracket to electrically connect the first lead portion and the second lead portion to a connecting portion; A method for manufacturing a brushless motor comprising:

[0146] According to the configuration of Supplementary Note 12, since the winding pair is connected to the connection part, the first lead part and the second lead part can be connected to the connection part by a simple assembly operation.

[0147] [Appendix 13] 13. The method for manufacturing a brushless motor according to claim 12, further comprising the step of cutting the winding pair while the winding pair is electrically connected to the connection portion to separate the winding pair into the first lead portion and the second lead portion.

[0148] According to the configuration of Supplementary Note 12, the winding pair is cut while the winding pair is electrically connected to the connection portion, and the winding is separated into the first lead portion and the second lead portion, thereby making it possible to reduce the weight and size of the brushless motor. [Explanation of symbols]

[0149] 11 Coil 12 windings 30, 230 bracket 31, 231 through holes 40, 240 guide part 50, 50U, 50V, 50W connection 150, 150U, 150V, 150W connection 250, 250U, 250V, 250W connection U1, U2, V1, V2, W1, W2 winding pairs U1a, U2a, V1a, V2a, W1a, W2a Lead parts U1b, U2b, V1b, V2b, W1b, W2b lead parts

Claims

1. A motor body, a bracket to which the motor body is attached; a power supply structure for supplying power to the motor body through a through hole formed in the bracket; A brushless motor comprising: the bracket is provided to cover an axial end surface of the motor body, The motor body includes a stator, the stator includes a stator core having a plurality of teeth, a stator coil formed by windings wound around the plurality of teeth, and an insulator disposed between the stator core and the windings, the insulator includes a guide portion having a support member that guides or supports the winding, the support member corresponding to the through hole; The power supply structure includes: For each phase, a winding pair consisting of a first lead portion of the winding and a second lead portion of the winding; a connection portion to which the first lead portion and the second lead portion are electrically connected, the connecting portions of the respective phases are disposed at positions offset in a predetermined direction that is the same direction from the axis center when viewed in the axial direction, a terminal holder fixed to the bracket, having the connection portion for each phase, and having insulating properties; the terminal holder includes a holder member provided opposite the through hole of the bracket and having at least one through hole formed therein for passing the winding pair therethrough; at least one of the winding pairs for each phase passes through the guide portion, passes through the through hole of the bracket in the axial direction, and passes through the through hole of the holder member in the axial direction; the remaining winding pairs of each phase pass through the guide portion and the through hole of the bracket in the axial direction; A brushless motor is bent in the predetermined direction at an axially outer end on the surface side of the bracket and extends along the surface of the holder member to the connection portion.

2. 2. The brushless motor according to claim 1, wherein the connection portions of the respective phases are linearly arranged in a direction intersecting the predetermined direction when viewed from the axial direction.

3. The power supply structure includes: For each phase, a plurality of the winding pairs; 3. The brushless motor according to claim 1, wherein the first lead portion and the second lead portion of the plurality of winding pairs are both electrically connected to the common connecting portion.

4. 3. The brushless motor according to claim 1, wherein the winding pair corresponding to one phase and the winding pair corresponding to another phase do not intersect with each other on the surface of the bracket when viewed in the axial direction.

5. the brushless motor is a three-phase motor, The bracket is formed with a plurality of through holes corresponding to the respective phases, The power supply structure includes: three connection parts corresponding to three phases, the connection portions of each phase are disposed at positions offset in the predetermined direction from the plurality of through holes when viewed in the axial direction, 3. The brushless motor according to claim 2, wherein the winding pairs for each phase are connected to the connection portions for each phase.

6. a drive circuit board attached to the front surface side of the bracket; 6. The brushless motor according to claim 2, wherein the connection portion of each phase is disposed in an area away from the drive circuit board when viewed in the axial direction.

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