Motor and fan device

Abstract

To provide a mechanically and electrically integrated motor in which a driver circuit can be avoided from being short-circuited even when a metal motor cover is deformed.SOLUTION: A motor comprises: a shaft fixed to the surface side of a motor bracket; a rotor freely rotatably supported by the shaft; a stator wound with a plurality of coils generating a magnetic field for rotating the rotor; a substrate in which a driver circuit controlling generation of a magnetic field generated by a coil is mounted to the surface of the substrate; an electrically conductive driver case which forms between the rear surface of the motor bracket and the driver case, a housing space for housing the substrate; a terminal which is arranged at the surface side of the substrate facing the motor bracket, and connects the driver circuit and the coils to each other; an electrically conductive fixing member which penetrates through the substrate from the rear surface side, and brings the terminal into contact with the substrate and fixes the terminal; and an insulating driver insulator which is arranged at the rear surface side of the substrate in such a way as to surround the fixing member, and protrudes to a position closer to the driver case than the fixing member.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a motor and a fan device equipped with the motor. [Background technology]

[0002] So-called "mechanically integrated" motors are known, which integrate a driver circuit for driving the motor. In such motors, a metal cover with excellent heat dissipation properties is sometimes used to protect the driver circuit from water damage (see, for example, Patent Document 1). Also, terminals connecting the driver circuit and the motor coil are sometimes fixed to the circuit board with metal screws (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-57345 [Patent Document 2] Japanese Patent Publication No. 2020-122426 Summary of the Invention [Problem to be solved by the invention]

[0004] A motor with the above configuration is used, for example, as a motor that rotates a cooling fan mounted on an automobile, etc. If the technologies of Patent Documents 1 and 2 are used in combination with a motor used for such an application, there is a problem that the motor cover may be deformed by an external force such as an automobile collision accident and come into contact with the screw that secures the terminal, causing a short circuit in the driver circuit.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a technique for preventing a short circuit in a mechanically and electrically integrated motor in which a driver circuit is integrated, even if the metal motor cover is deformed. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides a motor comprising: a motor bracket; a shaft fixed to a front surface of the motor bracket; a rotor rotatably supported by the shaft; a stator fixed to the front surface of the motor bracket inside the rotor and wound with a plurality of coils that generate a magnetic field for rotating the rotor; a board having a driver circuit mounted on its surface that controls the generation of the magnetic field by the coils; and a conductive driver case fixed to the back surface of the motor bracket and forming an accommodation space between the board and the motor bracket, the motor comprising: terminals arranged on the front surface of the board facing the motor bracket and connecting the driver circuit and the coils; a conductive fixing member that penetrates the board from the back surface and fixes the terminals in contact with the board; and an insulating driver insulator that is arranged on the back surface of the board and surrounding the fixing member, and protrudes to a position closer to the driver case than the fixing member. The fixing member includes a screw having a head and a shaft, and the driver insulator has a bottom wall in contact with the rear surface of the board, and a peripheral wall that projects from the bottom wall toward the driver case at a position surrounding the opening and is continuous in the circumferential direction, and the fixing member includes a ring-shaped washer interposed between the head and the bottom wall, and the driver insulator has a plurality of claws that are formed on the inner peripheral surface of the peripheral wall at positions spaced apart in the circumferential direction and that hold the washer between the driver insulator and the bottom wall. It is characterized by: [Effects of the Invention]

[0007] According to the present invention, in a mechanically and electrically integrated motor with an integrated driver circuit, it is possible to prevent a short circuit in the driver circuit even if the metal motor cover is deformed. Other problems, configurations, and advantages will become clear from the description of the following embodiments. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an external perspective view showing an example of the configuration of a fan device according to an embodiment; [Figure 2] FIG. 2 is an exploded perspective view of the motor and the fan. [Figure 3] FIG. 2 is a perspective view of the front side showing the configuration of the motor with the rotor yoke removed. [Figure 4] FIG. [Figure 5] FIG. 4 is a vertical cross-sectional view of the motor bracket and the driver case at the position of the driver insulator. [Figure 6] FIG. 2 is an exploded perspective view of components arranged on the rear side of the motor bracket. [Figure 7] FIG. 2 is a perspective view of a driver insulator. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fan device mounted on a vehicle such as an automobile to cool engine coolant flowing through a radiator will be described below as one aspect of a fan device according to an embodiment of the present invention.

[0010] (Overall configuration of fan device 1) First, the overall configuration of a fan device 1 will be described with reference to Figures 1 and 2. Figure 1 is an external perspective view showing an example of the configuration of a fan device 1 according to an embodiment. Figure 2 is an exploded perspective view of a motor 2 and a fan 3.

[0011] 1 and 2, the fan device 1 includes a motor 2 as a drive source, and a fan 3 that is rotationally driven by the motor 2 to generate cooling air. The fan device 1 is disposed, for example, in an engine compartment so that the motor 2 faces the engine and the fan 3 faces the radiator.

[0012] The fan 3 is fastened to the motor 2 by a plurality of screws 10. The screws are fastened from the front side of the fan 3 (the side opposite to the side facing the motor 2) through screw holes formed in a boss portion 31 that forms the center of the fan 3 to the rotor yoke 232 of the motor 2. Note that it is not necessary to use the screws 10 as fastening members for fastening the fan 3 to the motor 2; there are no particular restrictions on the number of screws or the type of fastening members as long as the fan 3 can be fastened to the motor 2.

[0013] The fan 3 has a boss portion 31 that rotates integrally with the rotor 23 with the axis of the shaft 21 as its center of rotation, a plurality of blades 32 (seven in this embodiment) that extend radially from the outer periphery of the boss portion 31, and a plurality of connecting members 33 (seven in this embodiment) that connect adjacent blades 32 at their tips.

[0014] Boss portion 31 includes a disk-shaped disk portion 311 and a cylindrical peripheral wall portion 312 that protrudes from the outer edge of disk portion 311 toward motor 2 and has a plurality of blades 32 attached thereto. When fan 3 is attached to motor 2, disk portion 311 faces connecting wall 232C of rotor yoke 232, and peripheral wall portion 312 surrounds outer peripheral wall 232A of rotor yoke 232.

[0015] (Motor 2 configuration) Next, the configuration of the motor 2 will be described with reference to Figures 3 and 4. Figure 3 is a perspective view of the front side of the motor 2, showing the configuration of the motor 2 with the rotor yoke 232 removed. Figure 4 is a vertical cross-sectional view of the motor 2.

[0016] As shown in FIGS. 3 and 4, the motor 2 is a so-called "mechanically integrated" electric motor that includes an outer rotor brushless motor 11 and a substrate 13 on which a driver circuit 12 is mounted.

[0017] The brushless motor 11 is supported by a motor bracket 14. The brushless motor 11 is disposed on one side (front side) of the motor bracket 14 in the thickness direction. A driver case 15 is fastened to the other side (back side) of the motor bracket 14 in the thickness direction with a plurality of screws. As a result, a storage space for accommodating the circuit board 13 is formed between the back side of the motor bracket 14 and the driver case 15.

[0018] That is, the substrate 13 is disposed on the opposite side of the motor bracket 14 from the components 21 to 24 of the brushless motor 11. The driver case 15 is made of a material (such as aluminum, iron, or stainless steel) that is conductive and elastically deforms and is resistant to breakage when an external force is applied.

[0019] In addition, a connector unit 16, which combines two connectors to which an external harness is connected, is attached to the end of the motor bracket 14. The brushless motor 11, driver circuit 12, and connector unit 16 are electrically connected.

[0020] As shown in Figures 3 and 4, brushless motor 11 has a shaft 21, a plurality of bearings 22 provided on the outer periphery of shaft 21, a rotor 23 rotatably supported around the axis of shaft 21 via bearings 22, and an annular stator 24 fixed to rotor 23 at a predetermined radial distance.

[0021] The shaft 21 is a fixed shaft fixed to the surface side of the motor bracket 14. In the following description of the components of the motor 2, the axial direction of the shaft 21 will be simply referred to as the "axial direction," the radial direction about the axis of the shaft 21 will be simply referred to as the "radial direction," and the circumferential direction about the axis of the shaft 21 will be simply referred to as the "circumferential direction."

[0022] As shown in FIG. 4, the rotor 23 has a plurality of permanent magnets 231 arranged at equal intervals in the circumferential direction so as to surround the outer periphery of the stator 24, and a rotor yoke 232 that supports the plurality of permanent magnets 231 and is rotatably supported on the shaft 21.

[0023] Rotor yoke 232 is disposed on the surface side of motor bracket 14 so as to be concentric with the axis of shaft 21. Rotor yoke 232 is rotatably supported on shaft 21 via a plurality of bearings 22. Rotor yoke 232 further includes an outer peripheral wall 232A, an inner peripheral wall 232B, and a connecting wall 232C.

[0024] The outer peripheral wall 232A has a cylindrical outer shape. The outer peripheral wall 232A is disposed radially outward of the stator 24. The inner peripheral surface of the outer peripheral wall 232A supports a plurality of permanent magnets 231. In other words, the plurality of permanent magnets 231 are fixed to the inner peripheral surface of the outer peripheral wall 232A at predetermined intervals in the circumferential direction.

[0025] The inner circumferential wall 232B has a cylindrical outer shape and is disposed radially inward of the stator 24. The inner circumferential wall 232B is rotatably supported by the shaft 21 via a plurality of bearings 22.

[0026] The connecting wall 232C has a disk-shaped outer shape. The connecting wall 232C connects one axial end of the outer circumferential wall 232A and one axial end of the inner circumferential wall 232B. The connecting wall 232C is disposed on the opposite side of the stator 24 from the motor bracket 14. The connecting wall 232C is disposed opposite the stator 24 with a predetermined gap therebetween in the axial direction.

[0027] The stator 24 is housed in a space surrounded by the outer peripheral wall 232A, the inner peripheral wall 232B, the connecting wall 232C, and the surface of the motor bracket 14. The stator 24 is fixed to the surface side of the motor bracket 14, radially inward of the multiple permanent magnets 231. The stator 24 faces the multiple permanent magnets 231 across a predetermined radial gap.

[0028] The stator 24 has a cylindrical stator core 241, insulating stator insulators 242 attached to both axial sides of a plurality of teeth protruding radially outward from the stator core 241, and a conductive coil 243 wound around the stator insulator 242.

[0029] The stator 24 generates a magnetic field when a current flows through the coil 243. Then, the rotor yoke 232 rotates around the axis of the shaft 21 due to attractive and repulsive forces generated between the magnetic field generated by the coil 243 and the plurality of permanent magnets 231.

[0030] The driver circuit 12 controls the generation of a magnetic field by the multiple coils 243. The driver circuit 12 is composed of multiple electronic components (e.g., transistors, diodes, resistors, etc.) surface-mounted on the surface of the substrate 13 facing the motor bracket 14. Note that the electronic components that make up the driver circuit 12 are not arranged on the back side of the substrate 13 facing the driver case 15.

[0031] Fig. 5 is a vertical cross-sectional view of motor bracket 14 and driver case 15 at the position of driver insulator 40. Fig. 6 is an exploded perspective view of components arranged on the back side of motor bracket 14.

[0032] 5 and 6, terminals 25A, 25B, and 25C are attached to the surface of substrate 13. Terminals 25A, 25B, and 25C electrically connect driver circuit 12 and coils 243. Brushless motor 11 has three terminals 25A, 25B, and 25C to supply three-phase (U-phase, V-phase, and W-phase) power to multiple coils 243. In other words, brushless motor 11 is a three-phase AC motor.

[0033] As shown in Fig. 5, terminals 25A, 25B, and 25C are fixed in contact with substrate 13 by screws 26A, 26B, and 26C. As shown in Fig. 6, screws 26A, 26B, and 26C are made up of cylindrical shanks 27A, 27B, and 27C with male threads formed on the outer circumferential surface, and heads 28A, 28B, and 28C provided on the base end side of shanks 27A, 27B, and 27C.

[0034] Then, shafts 27A, 27B, and 27C are inserted into through-holes 13A, 13B, and 13C that penetrate board 13 in the thickness direction from the back side of board 13, and terminals 25A, 25B, and 25C are sandwiched on the front side of board 13 and nuts are screwed in, thereby fixing terminals 25A, 25B, and 25C to board 13. Meanwhile, heads 28A, 28B, and 28C protrude from the back side of board 13 toward driver case 15. Screws 26A, 26B, and 26C are made of a conductive material such as metal.

[0035] Furthermore, washers 29A, 29B, and 29C and driver insulator 40 are interposed between the back surface of board 13 and heads 28A, 28B, and 28C. Washers 29A, 29B, and 29C are ring-shaped metal members that are disposed between board 13 and heads 28A, 28B, and 28C to prevent screws 26A, 26B, and 26C from loosening. Screws 26A, 26B, and 26C, washers 29A, 29B, and 29C, and nuts (not shown) are examples of conductive fixing members that fix terminals 25A, 25B, and 25C in contact with board 13. However, the combination of components of the fixing member is not limited to the above example.

[0036] (Configuration of driver insulator 40) 7 is a perspective view of driver insulator 40. Driver insulator 40 according to this embodiment is composed of bottom walls 41A, 41B, and 41C, peripheral walls 42A, 42B, and 42C, bosses 43A, 43B, and 43B, claws 44A, 44B, and 44C, and bridges 45A and 45B. Driver insulator 40 is made of an insulating material (e.g., resin).

[0037] The driver insulator 40 includes three sets of bottom walls 41A, 41B, and 41C, peripheral walls 42A, 42B, and 42C, bosses 43A, 43B, and claws 44A, 44B, and 44C, respectively, corresponding to the three terminals 25A, 25B, and 25C. Since the components of each set are common, the bottom wall 41A, peripheral wall 42A, boss 43A, and claw 44A will be described below.

[0038] The bottom wall 41A has a disk-shaped outer shape corresponding to the shape of the washer 29A. An opening 46A is formed in the center of the peripheral wall 42A, penetrating the wall in the thickness direction. The diameter of the opening 46A is larger than the diameter of the shank 27A of the screw 26A and smaller than the diameter of the head 28A. In other words, the shank 27A can pass through the opening 46A, but the head 28A cannot.

[0039] The peripheral wall 42A is disposed on one side (the driver case 15 side) of the bottom wall 41A in the thickness direction so as to surround the opening 46A. The peripheral wall 42A has a cylindrical outer shape. More specifically, the peripheral wall 42A protrudes from the bottom wall 41A and is continuous in the circumferential direction. The amount of protrusion of the peripheral wall 42A is greater than the height of the head 28A. That is, when the screw 26A and the driver insulator 40 are attached to the back surface of the circuit board 13, the tip of the peripheral wall 42A is positioned closer to the driver case 15 than the head 28A of the screw 26A. Furthermore, the inner diameter of the peripheral wall 42A is the same as or slightly larger than the outer dimension of the washer 29A.

[0040] The boss 43A is formed on the other side (substrate 13 side) in the thickness direction of the bottom wall 41A so as to surround the opening 46A. That is, the boss 43A protrudes from the bottom wall 41A in the opposite direction to the peripheral wall 42A. The boss 43A has a cylindrical outer shape. The inner diameter dimension of the boss 43A is slightly larger than the diameter of the shaft portion 27A. Furthermore, the outer dimension of the boss 43A is slightly smaller than the diameter of the through-hole 13A formed in the substrate 13. Furthermore, the protrusion amount of the boss 43A is smaller than the thickness dimension of the substrate 13.

[0041] The claws 44A are formed at a plurality of positions (e.g., three positions) spaced apart in the circumferential direction of the peripheral wall 42A at predetermined intervals (e.g., 120°) apart. The claws 44A protrude radially inward from the inner circumferential surface of the peripheral wall 42A. The diameter of an imaginary circle connecting the tips of the plurality of claws 44A is slightly smaller than the outer dimensions of the washer 29A. The claws 44A are formed with an axial gap between them and the bottom wall 41A. The gap between the bottom wall 41A and the claws 44A is slightly larger than the thickness of the washer 29A.

[0042] The bridge 45A connects adjacent peripheral walls 42A and 42B. Similarly, the bridge 45B connects adjacent peripheral walls 42B and 42C. This integrates the components of the driver insulator 40. Note that, although an example in which the three peripheral walls 42A, 42B, and 42C are linearly connected will be described in this embodiment, the positions of the three peripheral walls 42A, 42B, and 42C can be changed as appropriate depending on the layout of the terminals 25A, 25B, and 25C.

[0043] (Motor 2 assembly procedure) Next, a procedure for assembling the board 13, the driver case 15, the terminals 25A to 25C, the screws 26A to 26C, the washers 29A to 29C, and the driver insulator 40 will be described.

[0044] First, the terminals 25A to 25C are attached to the surface of the substrate 13. This electrically connects the terminals 25A to 25C to the driver circuit 12. Next, the washers 29A to 29C are fitted inside the peripheral walls 42A to 42C so that they climb over the claws 44A to 44C. This holds the washers 29A to 29C between the bottom walls 41A to 41C and the claws 44A to 44C.

[0045] Next, the bosses 43A to 43C are inserted into the through holes 13A to 13C from the back surface side of the substrate 13. As a result, the surfaces of the bottom walls 41A to 41C on which the bosses 43A to 43C are formed come into contact with the back surface of the substrate 13. Then, the openings of the washers 29A to 29C, the openings 46A to 46C of the bottom walls 41A to 41C, the internal spaces of the bosses 43A to 43C, and the through holes 13A to 13C of the substrate 13 communicate with each other.

[0046] Next, the screws 26A to 26C are inserted into the through holes 13A to 13C from the back side of the substrate 13. More specifically, the tips of the shafts 27A to 27C are inserted into the openings of the washers 29A to 29C, the openings 46A to 46C in the bottom walls 41A to 41C, the internal spaces of the bosses 43A to 43C, and the through holes 13A to 13C in the substrate 13. Then, on the front side of the substrate 13, the screws 26A to 26C are screwed into nuts with the terminals 25A to 25C sandwiched between them. This fixes the terminals 25A to 25C in contact with the front surface of the substrate 13.

[0047] Next, terminals 25A to 25C are electrically connected to coil 243. Furthermore, motor bracket 14 and driver case 15 are joined together with board 13 sandwiched therebetween, whereby board 13 is accommodated in the accommodation space.

[0048] According to the above embodiment, for example, the following advantageous effects are achieved.

[0049] According to the above embodiment, by surrounding the heads 28A to 28C with the peripheral walls 42A to 42C that protrude further toward the driver case 15 than the heads 28A to 28C, even if the driver case 15 is deformed toward the board 13 by an external force, the driver case 15 will come into contact with the peripheral walls 42A to 42C before the heads 28A to 28C. This makes it possible to prevent the driver case 15 from coming into contact with the heads 28A to 28C and causing a short circuit in the driver circuit 12.

[0050] In the above embodiment, an example has been described in which the heads 28A-28C are surrounded by circumferentially continuous peripheral walls 42A-42C, but the configuration of the driver insulator 40 for preventing contact between the driver case 15 and the heads 28A-28C is not limited to the above example. As another example, the driver insulator 40 may have a plurality of protrusions arranged at predetermined intervals in the circumferential direction at a position surrounding the heads 28A-28C. The plurality of protrusions may protrude to a position closer to the driver case 15 than the heads 28A-28C.

[0051] Furthermore, among the components of the fixing member that fixes the terminals 25A to 25C to the board 13, the components that are closest to the driver case 15 are not limited to the heads 28A to 28C of the screws 26A to 26C. In other words, the peripheral walls 42A to 42C only need to protrude to a position closer to the driver case 15 than the components of the fixing member that are located closest to the driver case 15 (for example, the washers 29A to 29C).

[0052] Furthermore, according to the above embodiment, by providing the claws 44A to 44C for holding the washers 29A to 29C, the driver insulator 40 with the washers 29A to 29C attached can be assembled to the board 13. This facilitates the assembly work of the driver insulator 40 to the board 13. However, the claws 44A to 44C can be omitted.

[0053] Furthermore, according to the above embodiment, by providing the bosses 43A to 43C to be inserted into the through holes 13A to 13C of the substrate 13, the driver insulator 40 can be easily positioned with respect to the substrate 13. However, the bosses 43A to 43C can be omitted.

[0054] Furthermore, according to the above embodiment, the components of the driver insulator 40 are integrated by connecting the multiple peripheral walls 42A to 42C with the bridges 45A and 45B. This further facilitates the assembly of the driver insulator 40 to the board 13. However, the bridges 45A and 45B may be omitted, and the three sets of bottom walls 41A to 41C and peripheral walls 42A to 42C may be independent.

[0055] The driver insulator 40 according to this embodiment is useful for preventing contact between the driver case 15 and the screws 26A to 26C when the amount of deformation of the driver case 15 is relatively small. However, when the driver case 15 is significantly deformed, the driver case 15 and the screws 26A to 26C may come into contact with each other, possibly causing a short circuit in the driver circuit 12.

[0056] Therefore, the driver circuit 12 according to this embodiment may have an output circuit (for example, a circuit composed of six transistors) that outputs power to the coil 243, and a so-called "open circuit failure detection circuit" that detects an overcurrent flowing through the output circuit and stops the supply of power to the output circuit. This makes it possible to prevent an overcurrent from continuing to flow through the driver circuit 12 even if the driver case 15 is deformed so much that it cannot be prevented by the driver insulator 40 alone. Note that the configuration of the open circuit failure detection circuit is already well known, so a detailed description thereof will be omitted.

[0057] In the above embodiment, an example in which the fan device 1 is mounted on a vehicle driven by an engine has been described, but the fan device 1 may also be mounted on a vehicle driven by a motor, a storage battery, a fuel cell, or the like. Furthermore, while an example in which the fan device 1 is used to supply cooling air to a radiator has been described, the use of the fan device 1 is not limited to this. Furthermore, in the above embodiment, an example in which the motor 2 is used as a fan motor that rotates and drives the fan 3 has been described, but the use of the motor 2 is not limited to this.

[0058] The above describes an embodiment of the present invention. However, the present invention is not limited to the above embodiment and includes various modifications. For example, the above embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to an embodiment including all of the described configurations. Furthermore, it is possible to replace part of the configuration of this embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of this embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of this embodiment with other configurations. [Explanation of symbols]

[0059] 1: Fan device 2: Motor 3: Fan 10, 26A, 26B, 26C: Screws 11: Brushless motor 12: Driver circuit 13: Substrate 13A, 13B, 13C: Through hole 14: Motor bracket 15: Driver case 16: Connector unit 21: Shaft 22: Bearing 23: Rotor 24: Stator 25A, 25B, 25C: Terminal 27A, 27B, 27C: Shaft part 28A, 28B, 28B: Head 29A, 29B, 29C: Washers 31: Boss Department 32: Feather 33: Connecting member 40: Driver insulator 41A, 41B, 41C: Bottom wall 42A, 42B, 42C: Peripheral wall 43A, 43B, 43C: Boss 44A, 44B, 44C: Nails 45A, 45B: Bridge 46A, 46B, 46C: Opening 231: Permanent magnet 232: Rotor yoke 232A: Outer wall 232B: Inner wall 232C: Connecting wall 241: Stator core 242: Stator insulator 243: Coil 311: Disc section 312: Peripheral wall part

Claims

1. A motor bracket; a shaft fixed to a surface side of the motor bracket; a rotor rotatably supported on the shaft; a stator fixed to the surface of the motor bracket inside the rotor and wound with a plurality of coils to generate a magnetic field for rotating the rotor; a substrate having a driver circuit mounted on its surface for controlling the generation of a magnetic field by the coil; a conductive driver case fixed to a rear side of the motor bracket and forming an accommodation space for accommodating the circuit board between the motor bracket and the conductive driver case, a terminal disposed on a surface side of the substrate facing the motor bracket, the terminal connecting the driver circuit and the coil; a conductive fixing member that penetrates the substrate from the rear surface side and fixes the terminal in contact with the substrate; an insulating driver insulator that is disposed on the rear surface side of the board so as to surround the fixing member and that protrudes to a position closer to the driver case than the fixing member; the fixing member includes a screw having a head and a shank; The driver insulator comprises: a bottom wall having an opening through which the shaft portion enters and contacting the rear surface of the substrate; a peripheral wall that projects from the bottom wall toward the driver case at a position surrounding the opening and is continuous in a circumferential direction, the fixing member includes a ring-shaped washer interposed between the head and the bottom wall; The motor is characterized in that the driver insulator has a plurality of claws formed at circumferentially spaced positions on the inner peripheral surface of the peripheral wall, and holding the washer between the claws and the bottom wall.

2. A motor bracket; a shaft fixed to a surface side of the motor bracket; a rotor rotatably supported on the shaft; a stator fixed to the surface of the motor bracket inside the rotor and wound with a plurality of coils to generate a magnetic field for rotating the rotor; a substrate having a driver circuit mounted on its surface for controlling the generation of a magnetic field by the coil; a conductive driver case fixed to a rear side of the motor bracket and forming an accommodation space for accommodating the circuit board between the motor bracket and the conductive driver case, a terminal disposed on a surface side of the substrate facing the motor bracket, the terminal connecting the driver circuit and the coil; a conductive fixing member that penetrates the substrate from the rear surface side and fixes the terminal in contact with the substrate; an insulating driver insulator that is disposed on the rear surface side of the board so as to surround the fixing member and that protrudes to a position closer to the driver case than the fixing member; the fixing member includes a screw having a head and a shank; The driver insulator comprises: a bottom wall having an opening through which the shaft portion enters and contacting the rear surface of the substrate; a peripheral wall that projects from the bottom wall toward the driver case at a position surrounding the opening and that is continuous in a circumferential direction; a boss that protrudes from the bottom wall in a direction opposite to the peripheral wall at a position surrounding the opening and that enters a through hole that penetrates the substrate in a thickness direction.

3. 3. The motor according to claim 1, three terminals for supplying three-phase power to a plurality of the coils; The driver insulator comprises: three sets of the bottom wall and the peripheral wall corresponding to the three terminals, respectively; and a bridge connecting adjacent peripheral walls.

4. The motor according to any one of claims 1 to 3, The motor is characterized in that the driver circuit detects that an overcurrent has flowed in an output circuit that outputs power to the coil, and stops supplying power to the output circuit.

5. A motor according to any one of claims 1 to 4; a fan that is rotationally driven by the motor to generate cooling air.

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