JP4956923B2 - Brushless motor - Google Patents

Description

  The present invention relates to a brushless motor for a vehicle, and more particularly to a connection structure between a coil wound around a stator and a connector connected to the outside.

  Conventionally, in a brushless motor used for a vehicle, a bus bar is used for connection of a winding in a stator and connection with a connector for electrical connection with the outside. Furthermore, for the purpose of higher efficiency and higher space factor, a so-called split core system has been adopted in which the stator is wound around each of the teeth divided and then wound together. A diagram using the bus bar and the split core is shown in FIG.

  Referring to FIG. 9, in the split core that forms stator 1, two ends 3 a of the winding start and end of winding 3 are formed for each tooth 2. For example, when a stator is formed with 12 teeth, 24 winding ends are formed. The ends 3 a of the windings 3 are connected by connection terminals 4 a that are output from bus bars 4 that are fixedly arranged on the upper side of the stator 1. The bus bar 4 is formed in an annular shape by insert molding a plurality of strip-shaped copper plates, and a part of the copper plate protrudes upward to form an output terminal 4b. A connector 5 that is electrically connected to the outside is disposed above the output terminal 4b. This connector 5 accommodates a connector terminal 5a for electrical connection. Then, the output terminal 4b and the connector terminal 5a are brought into contact with each other so as to electrically connect the winding 3 and the outside (as such an electrical connection structure between the conventional winding and the outside, for example, Patent Literature 1).

JP 2002-354775 A

  However, by using the bus bar 4 to connect the windings 3, the axial height of the brushless motor must be increased by the amount of the bus bar 4. Therefore, it is difficult to reduce the size of the brushless motor. Further, by using the bus bar 4, the bus bar 4 is a member having a large shape, so that a material cost is required. For this reason, it has been difficult to reduce the price of the brushless motor.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a brushless motor that achieves downsizing and cost reduction by not attaching a bus bar.

According to the first aspect of the present invention, the bracket has a cylindrical portion and is open at one end and supports one bearing at the other end, and the opening hole that is attached to the one end of the bracket and holds the other bearing. A bearing holder made of an insulating material having a shaft, a shaft that is provided so as to be inserted into the bracket and is rotatably supported by the both bearings, and an annular shape that is fitted in the cylindrical portion of the bracket A stator having a rotor magnet provided on an outer peripheral surface of the shaft and facing a radially inner portion of the stator via a gap, and the bearing holder so as to close the opening hole from the one end side. And a cover member attached to the stator, wherein the stator has a plurality of teeth projecting radially inward. A stator core having a tooth, an insulator covering a circumferential surface of each of the stator cores excluding a radially inner surface, and a winding wound around each of the teeth of the stator core via the insulator. The bearing holder has a radial extension extending radially outward, and a radial recess formed radially outward of the radial extension and opening radially outward. and has the stator plurality of connecting metal is supported in the winding of each of the teeth by the said fitting are connected to a plurality of phases, fittings made of each phase each terminal of each said connection fitting Is formed with a terminal piece protruding from a connection opening formed in the bearing holder. A base of an external lead pin extending through the radial extension is disposed in the connection opening, a tip of the external lead pin is disposed in the radial recess, and the terminal piece is disposed in the connection opening. It is connected to an external lead pin, and the connection opening is closed by a part of the cover member.

According to the first aspect of the present invention, the insulator can be supported by the insulator, and can be electrically connected to the outside by the terminal piece formed on the connector that serves as a terminal for each phase. That is, since the bearing holder can also serve as a bus bar that has been conventionally required, the bus bar can be eliminated. Thereby, the space for a bus bar can be restrained and the miniaturization of a brushless motor can be realized. Further, since the bus bar can be deleted, the material cost and the processing cost related to the bus bar can be deleted, so that the price of the brushless motor can be reduced. Further, since the connection opening is formed, after the bearing holder is fixed to the stator, more specifically, after the assembly other than the cover member is assembled, the connection fitting and the external lead pin can be welded. Thereby, working efficiency can be improved significantly. Furthermore, since the connection opening becomes a connection space between the terminal piece and the base, it is not necessary to newly provide a space for connection in the axial direction. Therefore, the motor can be reduced in size.

  According to the present invention, it is possible to provide a brushless motor that achieves downsizing and cost reduction by not attaching a bus bar.

<Overall configuration of brushless motor>
First, the overall configuration of the brushless motor according to the present invention will be described.

  FIG. 1 is a schematic cross-sectional view in the axial direction of an embodiment of a brushless motor according to the present invention. Hereinafter, the description of the direction in the specification corresponds to the drawings, and is not limited to the actual product.

  With reference to FIG. 1, the bracket 10 has a substantially cylindrical shape formed by pressing a steel plate or the like, and a through hole 11 is provided at the center thereof. In addition, the bracket 10 is provided with three cylindrical portions having a smaller radial diameter in order from the lower side in the axial direction, and a member is disposed in contact with each cylindrical portion.

  An annular oil seal 20 is fixed to the first cylindrical portion 12 provided on the lowermost side and having the smallest radial direction diameter. Further, a ball bearing 30 that is a bearing and a spring ring 40 that applies preload to the ball bearing 30 are disposed in contact with the second cylindrical portion 13. Further, an annular stator 50 is fixed to the third cylindrical portion 14. An annular step portion 15 is formed in a part of the third cylindrical portion 14, and the stator 50 is positioned in the axial direction by receiving the step portion 15.

  The stator 50 is formed by connecting a plurality of blocks including a stator core 53, an insulator 54, and a winding 55. That is, the stator core 53 that is configured by the arc-shaped core back portion 51 and the teeth portion 52 that protrudes radially inward from the center of the core back portion 51 is substantially the same shape as the stator core 53, and covers the stator core 53. The insulator 54 is fixed, and a plurality of blocks in which the windings 55 are wound around the insulator 54 are formed. These blocks are connected to form an annular shape. The winding 55 is composed of three phases of U phase, V phase, and W phase, and is welded to a connection fitting 57 serving as a terminal described later while crossing each block.

  Further, an extension portion 16 extending substantially horizontally in the radial direction is formed at the upper end portion of the bracket 10, and the bearing holder 60 is in contact with the extension portion 16 and the upper side of the stator 50 of the third cylindrical portion 14. Abutment is arranged. An opening hole 61 penetrating in the axial direction is formed in a part of the bearing holder 60. Further, on the upper side of the inner peripheral surface of the opening hole 61, a radially enormous portion 61a extending in the radial direction is formed. And the ball bearing 31 is arrange | positioned so that this radial direction enormous part 61a may be contact | abutted.

  Further, a cover member 70 is disposed on the upper side of the bearing holder 60 and fixes the outer ring of the ball bearing 31 and the bearing holder 60. For fixing the bearing holder 60 and the cover member 70, a plurality of fixing members such as screws are fixed in the circumferential direction.

  The shaft 80 is inserted through the through hole 11 of the bracket 10 and the oil seal 20, is fixed to the ball bearings 30 and 31, and is rotatably supported. Further, retaining rings 90 and 91 are respectively fixed so as to fix the inner rings on the upper side of the ball bearing 30 of the shaft 80 and the lower side of the ball bearing 31. The ball bearing 30 is preloaded by the spring ring 40 and the retaining ring 90, and the ball bearing 31 is preloaded by the cover member 70 and the retaining ring 91. Furthermore, a gear for transmitting the driving force of the shaft 80 is provided at the lower end portion of the shaft 80.

  A circuit board 110 on which the Hall element 100 is mounted is fixed to the lower surface of the bearing holder 70 by a fixing member. Further, a sensor magnet 120 is fixed by a yoke 130 fixed to the shaft 80 so as to face the hall element 100 in the axial direction with a minute gap. Further, the sensor magnet 120 is fixed by fixing the annular fastening member 140 to the yoke 130 from the opposite side of the yoke 130 in the axial direction.

  Further, a rotor core 150 formed by laminating a plurality of annular thin plates constituting the rotor so as to face the stator 50 via a minute gap in the radial direction at a position facing the stator 50 of the shaft 80, and the rotor core 150 A plurality of rotor magnets 160 fixed to the outer peripheral surface of the rotor magnet 160 and a rotor cover 170 covering the outer peripheral surface of the rotor magnet 160 are fixed to prevent the rotor magnet 160 from falling off.

  By energizing the stator 50 from the outside, a magnetic field is generated around the stator 50, and due to the interaction between the magnetic field and the rotor magnet 160, the rotor can obtain a rotational driving force and rotate.

<Main part>
Next, the relationship between the stator core 53 and the insulator 54 and the relationship between the stator 50 and the bearing holder 60, which are main parts of the present invention, will be described with reference to FIGS.

<Structures of Stator Core 53, Insulator 54, and Connection Fitting 56>
FIG. 2 is a partial perspective view showing the relationship between the stator 50, the insulator 54, and the connection fitting 56. 3 shows the insulator 54, in which a) is a top view, b) is a front view, and c) is a lateral view. 4 shows the connection fittings 56 and 57, FIG. 4 a) is a top view of the connection fitting 56, b) is a front view, and c) is a front view of the connection fitting 57. FIG.

  Referring to FIG. 2, stator 50 has a stator core 53 configured by a core back portion 51 forming an annular shape and a tooth portion 52 that protrudes radially inward from core back portion 51 and faces rotor magnet 160 in the radial direction. An insulator 54 that covers the teeth 52 of the stator core 53 other than the facing surface 52a of the rotor magnet 160, a winding 55 wound through the insulator 54 (not shown in FIG. 2), and a connection fixed to the insulator 54 It consists of a metal fitting 56.

  Next, the structure of the insulator 54 and the connection fittings 56 and 57 will be described.

  Referring to FIG. 3 c, a protruding portion 54 a is formed at the center in the circumferential direction of the corresponding portion of the inner peripheral edge of the core back portion 51 of the insulator 54. Further, on the outer side in the radial direction of the projecting portion 54a, a crossing groove 54b for fixing and holding a crossover of the winding 55 (not shown in FIG. 3) is formed. Referring to a) of FIG. 3, a fitting hole 54c for fitting the connection fitting 56 is formed at the center of the protruding portion 54a. In the brushless motor of the present embodiment, since the winding 55 of the stator 50 is formed of three phases of U phase, V phase, and W phase, the axial depth of the transition groove 54b is the axial direction of the winding 55. It is desirable that the depth is such that three are arranged side by side. As a result, even if three windings 55 are arranged in the transition groove 54b, the transition groove 54b has a depth equivalent to three windings, so that the winding 55 can be accommodated in the transition groove 54b. . Furthermore, since the connecting wire of the winding 55 contacts the inner peripheral side of the connecting groove 54b, the axial height of the protruding portion 54a is higher than the outer peripheral edge portion 54d provided on the radially outer side of the connecting groove 54b. It is possible to prevent the winding 55 from being detached from the insulator 54.

  Further, referring to a) and c) of FIG. 3, the inner side of the outer peripheral edge 54d formed on the outer side of the transition groove 54b of the insulator 54 has an arc shape that curves straightly and the outer side curves outward. That is, the thickness of the central portion of the outer peripheral edge portion 54d is increased. As a result, a large contact area with an axial protruding portion 62 of the bearing holder 60 described later can be secured, so that a larger contact pressure from the bearing holder 60 can be supported.

  Referring to a) of FIG. 3, inclined surfaces 54b1 that are inclined inward in the radial direction are formed at both ends on the radially inner side of the transition groove 54b. Thereby, the transition between the adjacent teeth 52 of the winding 55 can be performed smoothly. On the other hand, if the inclined surface 54b1 is not formed, that is, the corner 55 is formed at both ends in the circumferential direction of the transition groove 54b, the winding 55 comes into contact with the corner when passing through the adjacent transition groove 54b. End up. When the vibration of the stator 50 is applied in this contacted state, the winding 55 is damaged. Further, since a maximum of three windings 55 are accommodated in the transition groove 54b, there are a maximum of three windings 55 in contact with the corners, and there is a possibility that the wound windings 55 are short-circuited. Therefore, by forming the inclined surface 54b1, no corner is formed between the adjacent transition grooves 54b, so that the winding 55 is not damaged, and a short circuit between the windings 55 can be prevented.

  Referring to FIG. 3 b, the insulator 54 covers the upper half of the tooth portion 52. The lower half of the tooth portion 52 is covered with an insulator (not shown) that does not have the bridging groove 54b. Thereby, the core back part 51 and the teeth part 52 other than the radially opposing surfaces of the rotor magnet 160 can be covered.

  Referring to FIG. 4b), the connection fitting 56 is provided with circumferentially extending portions 56a at both ends of the upper portion. Furthermore, referring to a) of FIG. 4, the circumferentially extending portion 56a is curved inward in the radial direction, and a connecting arm portion 56b that locks the winding start or winding end of the winding 55 is formed. ing. The end of the winding 55 is locked to the connection arm portion 56b, and the connection fitting 56 and the winding 55 are fixed by welding while maintaining the state. Thereby, welding of the connection metal fitting 56 and the coil | winding 55 can be performed by an easy operation | work.

  Further, referring to c) of FIG. 4, the connection fitting 57 serving as a terminal for connecting the end portion which is the output of the winding 55 is further provided with a terminal piece 57 a on which the fitting protrudes above the connection fitting 56.

<Relationship between stator 50 and bearing holder 60>
The relationship between the stator 50 and the bearing holder 60 is shown in FIG. FIG. 5 is an enlarged view of the dotted circle in FIG.

Referring to FIG. 5, an axial protrusion 62 that abuts on the outer peripheral edge 54 d of the insulator 54 is formed on the lower side of the bearing holder 60. The contact pressure from the bearing holder 60 can be transmitted to the insulator 54 by the axial protrusion 62. As a result, the stator 50 can be more strongly suppressed via the insulator 54, that is, the stator 50 can be suppressed and held from both sides by the axial projecting portion 62 and the step portion 15 of the bracket 10. Can suppress vibration. Thereby, the brushless motor which reduced the vibration and the noise resulting from a vibration can be provided.

A radial recess 63a is formed in one of the radial extensions 63 extending radially outward from the bracket 10 of the bearing holder 60. The radial recess 63a is provided with a plurality of through holes, and a part of the external lead pin 64 formed of a band-shaped metal protrudes into the radial recess 63a through the through holes. Thereby, the external lead pin 64 achieves electrical continuity between the outside of the motor and the inside of the motor. Further, the signal terminal 110a from the circuit board 110 also passes through the through hole, and a part of the signal terminal 110a protrudes into the radial recess 63a so that it can be connected to the outside. That is, it plays the role of a connector. Thereby, since the molded integrally with connector, prevents to produce a connector in a separate member, it is possible to reduce the number of parts. Furthermore, it can contribute to the reduction of the assembly man-hour accompanying the reduction in the number of parts. As a result, it is possible to reduce the price of the brushless motor.

  A through hole 63 b is formed on the other side of the radial extension 63. The extending portion 16 of the bracket 10 and the cover member 70 are fixed by a fixing member 180 such as a screw so as to be inserted through the through hole 63b.

A connection opening 65 penetrating the bearing holder 60 in the axial direction is formed at a portion corresponding to the connection fitting 57 of the bearing holder 60. Further, the base 64 a of the external lead pin 64 is disposed in the connection opening 65. The base 64a is curved in a U shape in the axial direction. The base 64a and the terminal piece 57a of the connection fitting 57 are fitted and welded, so that they can be securely fixed. Further, since the connection opening 65 is formed, after the bearing holder 60 is fixed to the stator 50, more specifically, after the assembly other than the cover member 70 is assembled, the connection fitting 57 and the base 64a of the external lead pin 64 are welded. Can be done. Thereby, working efficiency can be improved significantly. Further, since the connection opening 65 becomes a connection space between the terminal piece 57a and the base 64a, it is not necessary to newly provide a space for connection in the axial direction. Therefore, the motor can be reduced in size.

  An annular recess 63c is formed in a part of the radial extension 63 of the bracket holder 60, and a sealing member 190 such as an O-ring is fixed. With this sealing member 190, the inside of the motor can be completely sealed. This is suitable for a motor that needs to be completely airtight inside a motor used in a bad environment or underwater.

<Method for manufacturing brushless motor>
Finally, the assembly process of the brushless motor of this embodiment will be described with reference to FIGS. FIG. 6 shows the assembly process of the brushless motor. FIG. 7 is an assembly diagram in step S4 of the assembly process of the brushless motor.

  First, the oil seal 20 and the stator 50 previously connected with the winding 55 are fixed to the bracket 10 to form a bracket assembly (step S1). The connecting step may be performed after fixing the stator 50 to the bracket 10.

  Next, the ball bearing 30, the retaining rings 90 and 91, the yoke 130 holding the sensor magnet 120, the annular fastening member 140 for fastening the sensor magnet 120, and the rotor magnet 160 having the rotor cover 170 on the outer peripheral surface are fixed to the shaft 80. The rotor core 150 thus fixed is fixed to form a rotor assembly (step S2). The steps S1 and S2 may be reversed.

Next, the bearing holder 60 to which the external lead pin 63, the circuit board 110, and the sealing member 190 are fixed is fixed to the rotor assembly (step S3). At this time, the ball bearing 31 is used for fixing the rotor assembly and the bearing holder 60. The ball bearing 31 and the bearing holder 60 and the ball bearing 31 and the shaft 80 are fixed by press-fitting. Thereby, the precision of the concentricity of the radial direction enormous part 61a which is the arrangement | positioning part of the ball bearing 31 of the bearing holder 60, and the shaft 80 which is a rotation center can be improved. Further, since the ball bearing 31 and the bearing holder 60 are press-fitted and fixed, the outer ring of the ball bearing 31 and the radially large portion 61a of the bearing holder 60 are fixed with high precision, and the inner ring of the ball bearing 31 and the shaft 80 are fixed. Since the outer peripheral surface is press-fitted and fixed, the fixing accuracy between the bearing holder 60 and the shaft 80 can be improved. That is, the accuracy of the perpendicularity of the shaft 80 with respect to the radial plane of the bearing holder 60 can be improved. Therefore, it is possible to improve the accuracy of the positional relationship between the circuit board 110 fixed to the lower surface of the bearing holder 60 and the Hall element 100 mounted on the circuit board 110 and the sensor magnet 120 fixed to the shaft 80. it can. As a result, the contact between the Hall element 100 and the sensor magnet 120 can be prevented by the inclination of the shaft 80.

  Next, the rotor assembly assembled in step S3 is inserted into the bracket assembly assembled in step S1 (step S4). At this time, the spring ring 40 is disposed on the bracket 10. In this step, the connection fitting 57 serving as a terminal and the external lead pin 64 are brought into contact with each other and temporarily fixed. Further, the accuracy of the concentricity between the center of the stator 50 of the bracket assembly and the center of the shaft 80 serving as the rotating shaft is improved by fixing the axially protruding portion 62 of the bearing holder 60 and the cylindrical portion of the bracket 10 with high accuracy. be able to. Thereby, contact between the inner peripheral surface of the stator 50 and the rotor cover 170 due to the inclination of the shaft 80 can be prevented.

  Next, the connection fitting 57 and the base 64a of the external lead pin 64 are welded from the connection opening 65 of the bearing holder 60 (step S5).

  Finally, the ball bearing 31 is fixed to the bearing holder 60 and the shaft 80, and the cover member 70 is brought into contact (step S6). For fixing the bracket 10, the bearing holder 60, and the cover member 70, a fixing member such as a screw is used.

  By these steps, the connection fitting 57 inside the motor and the base 64a of the external lead pin 64 can be welded from the bearing holder 60 in a state where the bearing holder 60 is assembled. Since the welding process can be performed with the position 64 fixed, stable welding can be performed and workability can be improved.

  Further, since the connection opening 65 is provided, the connection fitting 57 and the external lead pin 64 can be welded in a state where the bearing holder 60 is assembled, so that the rotor assembly yoke is inserted into the bracket assembly after the rotor assembly is inserted into the bracket assembly. The bearing holder 60 having the radially large portion 61 a smaller than the outer diameter of 130 can be fixed to the bracket 10. Furthermore, since the circuit board 110 can be fixed to the lower surface of the bearing holder 60, a new holding member for the circuit board 110 and the bracket 10 can be formed, so that the number of parts can be reduced. As a result, the price of the brushless motor can be reduced.

  Next, with reference to FIG. 7, the detail about step S4 which is an assembly process of a bracket assembly and a rotor assembly is demonstrated.

  Referring to FIG. 7A, an assembly jig 300 includes a rotor assembly mounting jig 310 that is movable in the axial direction and a bracket assembly mounting that is fixed to the rotor assembly mounting jig 310 with good coaxial accuracy. It is comprised from the mounting jig 320. FIG. The rotor assembly mounting jig 310 has an axial protruding portion 311 formed at the center thereof. The axial protruding portion 311 has a protruding shaft portion 312 having an outer diameter smaller than the inner diameter of the oil seal 20 and an outer diameter larger than that of the oil seal 20 with reference to FIG. And a shaft mounting portion 313 having an inner diameter that is substantially the same (clearance fit). A recess 312 a is formed at the center of the upper surface of the protruding portion shaft 312. Further, a convex portion 313a is formed at the center of the lower surface of the shaft placement portion 313 so as to correspond to the concave portion 312a.

  The bracket assembly mounting jig 320 has a substantially cylindrical shape with an upper opening, and a through hole 321 through which the axial protruding portion 311 of the rotor assembly mounting jig 310 is inserted is formed at the center thereof. Then, the bracket assembly is axially positioned by bringing the extended portion 16 of the bracket 10 into contact with the upper end surface 322 of the bracket assembly mounting jig 320. Further, the bracket assembly is positioned in the radial direction by loosely fitting the inner peripheral surface of the bracket assembly mounting jig 320 and the outer peripheral surface of the bracket 10.

  Next, only the protruding shaft portion 312 of the axially protruding portion 311 of the rotor assembly mounting jig 310 is configured and inserted into the through hole 321 of the bracket assembly mounting jig 320. Since the protruding shaft portion 312 has an outer diameter smaller than the inner diameter of the oil seal 20, it can move upward in the axial direction without damaging the inner peripheral surface of the oil seal 20. After the protruding shaft portion 312 passes through the oil seal 20, the convex portion 313 a of the shaft placement portion 313 is fixed to the concave portion 312 a of the protruding shaft portion 312. And the lower part of the shaft 80 is fixed to this shaft mounting part 313. Thereby, the coaxial degree of the axial direction protrusion part 311 and the shaft 80 corresponds. Then, by moving the protruding shaft portion 312 downward in the axial direction, the rotor assembly and the bracket assembly can be assembled with improved coaxiality accuracy. Further, since the lower surface of the shaft mounting jig 313 is larger than the protruding shaft portion 312 in the radial direction, when the protruding shaft portion 312 is moved downward in the axial direction, the shaft mounting jig 313 comes into contact with the inner diameter of the oil seal 20. By forming the curved surface portion 313b in the contact portion of the oil seal 20 on the lower surface of the jig 313, the oil seal 20 can be inserted without damaging the inner diameter.

  As mentioned above, although the Example of this invention was described, this invention is not limited to this, A various deformation | transformation is possible.

  For example, in the embodiment, the ball bearings 30 and 31 are used as the bearings. However, the present invention is not limited to this, and the shaft 80 may be rotatably supported.

  Further, for example, the circuit board 110 and the sensor magnet 120 on which the ball element 100 is mounted are used for the rotation control of the present invention. However, the present invention is not limited to this, and the rotation control may be performed. A resolver may be used.

  For example, as shown in FIG. 8, a bayonet device 200 may be mounted between the ball bearing 31 and the cover member 70. In this bayonet apparatus 200, a plug 203 provided with a fitting groove 201 such as a hexagonal groove and a fitting protrusion 202 such as a hexagonal protrusion is fixed to an opening hole formed in the cover member 70. A fitting hole 81 is formed in the shaft 80 so as to engage with the fitting protrusion 202 of the plug 203. Further, an enormous concave portion larger than the outer diameter of the ball bearing 31 is formed above the ball bearing 31 of the bearing bush 60, and a fitting bush 204 is fixed so as to be fitted into the enormous concave portion. A wave spring 205 having an annular plane up to the outer ring of the ball bearing 31 is arranged between the enormous recess and the fitting bush 204 in the axial direction. The wave spring 205 presses the lower surface of the plug 203 to move the plug 203 in the axial direction. Further, an annular extension 203a in the radial direction is formed on the lower surface of the plug 203. The annular extension 203a and the lower surface of the fitting bush 204 engage with each other, thereby restricting axial movement. . Further, a sealing member 206 such as an O-ring is disposed in the gap between the cover member 70 and the fitting bush 204 and between the plug 203 and the fitting bush 204, and the inside of the motor can be completely sealed.

  Even if the motor is electrically locked by the bayonet device 200 due to disconnection of the winding 55 of the stator 50 or destruction of the circuit board 110, a fitting member such as a hexagon wrench is inserted into the fitting groove 201 of the plug 203. By fitting, the motor can be forcibly rotated from the outside. This is suitable for a vehicle motor.

  Further, for example, the lower tip of the shaft 80 in the present embodiment is a gear, but the present invention is not limited to this, and it is sufficient that the driving force of the shaft 80 can be transmitted. The driving force of the shaft 80 may be transmitted by forming a D cut on the transmission side. Furthermore, you may transmit the driving force of the shaft 80 by fixing the gear of another member to this D cut.

It is the axial sectional view showing one form of the example of the brushless motor concerning the present invention. It is a perspective view of the stator which shows a part of main part of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure of the insulator which shows a part of main part of this invention, a) is a top view, b) is a front view, and c) shows a side view. It is a figure of the connection metal fitting which shows a part of principal part of the present invention, a) shows a top view, b) shows a front view, and c) shows a front view of the connection metal fitting used as a terminal. It is an enlarged view which shows the principal part of this invention, and is an enlarged view of the dotted-line circle of FIG. It is process drawing which shows the assembly process of the Example of this invention. It is an assembly drawing of the Example of this invention, and b) is an enlarged view of an axial protrusion part. It is an axial schematic sectional drawing which shows the other Example of this invention. It is a schematic cross section which shows the conventional Example.

Explanation of symbols

10 Bracket 20 Oil seal 30, 31 Ball bearing 40 Spring ring 50 Stator 51 Core back portion 52 Teeth portion 52a Opposing surface 53 Stator core 54 Insulator 54a Protruding portion 54b Crossing groove 54b1 Inclined surface 54c Fitting hole 54d Outer peripheral edge portion 55 Winding 56, 57 Connection fitting 57a Terminal piece 60 Bearing holder 61 Axial protrusion 64 External lead pin 64a Base 65 Connection opening 70 Cover member 80 Shaft 90, 91 Retaining ring 100 Hall element 110 Circuit board 120 Sensor magnet 130 Yoke
140 Fastening Member 150 Rotor Core 160 Rotor Magnet 170 Rotor Cover 180 Fixing Member 190 Sealing Member 200 Bionette Device 300 Assembly Jig 310 Rotor Assembly Jig 320 Stator Assembly Jig

Claims (4)

A bracket having a cylindrical portion and having one end opened and supporting one bearing on the other end;
A bearing holder made of an insulating material attached to the one end side of the bracket and having an opening hole for holding the other bearing;
A shaft that is provided so as to be inserted into the bracket and is rotatably supported by the two bearings;
An annular stator fitted in the cylindrical portion of the bracket;
A rotor having a rotor magnet provided on an outer peripheral surface of the shaft and facing a radially inner portion of the stator via a gap;
A cover member attached so as to close the opening hole from the one end side of the bearing holder;
A brushless motor with
The stator includes a stator core having a plurality of teeth protruding radially inward;
An insulator that covers each circumferential surface of the stator core except the radially inner surface of each of the teeth;
A winding wound around each of the teeth of the stator core via the insulator;
Have
The bearing holder includes a radial extension extending radially outward;
A radial recess formed radially outward of the radial extension and opening radially outward;
Have
A plurality of connection fittings are supported on the stator, and the windings of the teeth are connected to a plurality of phases by the connection fittings ,
A terminal piece protruding from a connection opening formed in the bearing holder is formed in the connection metal fitting serving as a terminal for each phase among the connection metal fittings,
In the bearing holder, a base portion of an external lead pin extending from the radially outer side through the radial extension portion is disposed in the connection opening, and a tip of the external lead pin is disposed in the radial recess. A brushless motor in which the terminal piece is connected to the external lead pin in the connection opening, and the connection opening is closed by a part of the cover member. Brushless motor according to 請 Motomeko 1 connector to the bearing holder that is formed integrally.
The bracket has a step portion on the other end side, the stator contacts the step portion, and the bearing holder extends in the axial direction toward the other end side substantially in parallel with the rotation shaft. The brushless motor according to claim 1 , wherein the stator is held and held by the stepped portion and the axial projecting portion .
The brushless motor according to claim 3 , wherein the axial projecting portion is in contact with the insulator, and at least one of the plurality of connection fittings is supported by the insulator .

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