JP6620648B2 - Brushless motor - Google Patents

Description

  The present invention relates to a brushless motor integrated with a control circuit used for, for example, an electric variable valve timing (electric VCT) motor that controls an engine of a vehicle.

  2. Description of the Related Art Conventionally, there is an electric variable valve timing device that controls opening / closing timing of an engine valve of a vehicle by driving a motor. As a brushless motor used in this valve timing device, for example, there is a configuration disclosed in Patent Document 1.

  The brushless motor disclosed in Patent Document 1 is configured by integrally assembling a motor body and a control circuit. Motor components such as a stator and a rotor are accommodated in the bottomed cylindrical yoke housing, and the opening of the yoke housing is closed by an end frame. A control circuit is provided on the surface of the end frame on the side opposite to the yoke housing, and a lead wire extending from the stator coil is disposed in such a manner as to pass through an opening provided in the end frame and is electrically connected to the control circuit. A motor cover is attached to the end frame so as to cover the control circuit.

JP 2011-142770 A

  By the way, on the motor body side, if foreign matter generated in the manufacturing process or use process adheres to the control circuit, there is a risk of causing problems such as short-circuiting of the control circuit if the foreign matter is conductive. The inventor has been studying whether it is possible to easily prevent foreign matter from entering the control circuit housing portion.

  An object of the present invention is to provide a brushless motor integrated with a control circuit that can prevent foreign matter from entering the control circuit housing portion by a simple method.

  A brushless motor that solves the above-described problems is a motor with which a stator and a rotor are accommodated in a bottomed cylindrical yoke housing, and the opening of the yoke housing is closed by an end frame. A brushless motor in which a control circuit for performing control is disposed on a side opposite to the yoke housing of the end frame and is covered with a motor cover, and the end frame is disposed in a side wall provided upright along a peripheral edge. And having a substrate housing recess for housing the circuit board of the control circuit and a communication hole communicating with the inside of the motor body, and having a separation wall for separating the substrate housing recess and the communication hole, The motor cover has an adhesive interposed between end faces of side walls of the end frame, and the motor on the separation wall. Bar and adhesive to all or part of the facing surface is interposed between the separation of the separation wall and the substrate accommodating recess including said adhesive and said communication hole is achieved.

  According to this configuration, the end frame of the motor body has the board housing recess for housing the control circuit (circuit board) in the side wall along the peripheral edge and the communication hole communicating with the inside of the motor body. The substrate housing recess and the communication hole are separated by the separation wall. The motor cover is fixed with an adhesive interposed between the end surfaces of the side walls of the end frame, and the adhesive is also interposed on all or part of the surface of the separation wall facing the motor cover. In addition, the substrate receiving recess and the communication hole including the adhesive can be separated. As a result, it is possible to easily suppress foreign matters from the motor main body generated during the use process and the manufacturing process from entering the substrate housing recess side, that is, the control circuit (circuit board) side from the communication hole of the end frame.

In the brushless motor, it is preferable that the separation wall includes a reinforcing rib provided upright on the end frame other than the side wall.
According to this configuration, since the reinforcing rib provided on the end frame also functions as a separation wall, an increase in the number of parts can be suppressed.

In the brushless motor, it is preferable that the separation wall includes a case member of a terminal portion provided on the circuit board in order to connect with the winding of the stator.
According to this configuration, since the case member of the terminal portion provided on the circuit board for connecting to the stator winding also functions as the separation wall, an increase in the number of components can be suppressed.

In the brushless motor, it is preferable that a groove is formed in a portion of the separation wall where the adhesive is applied.
According to this configuration, since a groove is formed in the part where the adhesive is applied on the separation wall and the adhesive enters the groove, the holding power of the adhesive is increased, and the adhesive part becomes a labyrinth structure to enter foreign matter. Is less likely to occur.

  In the brushless motor, the motor body is installed and used so that the axial direction of the rotation axis of the motor body intersects the vertical direction, and the substrate is accommodated more than the communication hole communicating with the inside of the motor body. It is preferable that the concave portion is configured with an arrangement structure located on the upper side.

  A brushless motor (motor body) is used by being installed so that the axial direction of the rotation axis intersects the vertical direction. Taking this into consideration, the substrate housing recess is positioned above the communication hole of the end frame that communicates with the inside of the motor body, so that the substrate housing recess, that is, the control circuit (circuit board) is formed from the communication hole. It is possible to more reliably suppress the entry of foreign matter into the ground due to gravity.

  According to the brushless motor of the present invention, entry of foreign matter into the control circuit housing portion can be prevented by a simple method.

Sectional drawing of the brushless motor of embodiment. The disassembled perspective view which shows the structure of the stator and rotor of the same form. The disassembled perspective view which shows the structure of the rotor of the same form. The disassembled perspective view which shows the disassembled state of the control circuit part of the same form. The disassembled perspective view which shows the state before fixation of the motor cover of the same form. The disassembled perspective view which shows the fixed aspect of the end frame and motor cover of the same form. The disassembled perspective view which shows the fixation aspect of the end frame and motor cover of another example. The disassembled perspective view which shows the fixation aspect of the end frame and motor cover of another example. The disassembled perspective view which shows the fixation aspect of the end frame and motor cover of another example. The disassembled perspective view which shows the fixation aspect of the end frame and motor cover of another example. The disassembled perspective view which shows the fixation aspect of the end frame and motor cover of another example.

Hereinafter, an embodiment of the brushless motor will be described.
As shown in FIG. 1, the brushless motor M of the present embodiment is a motor used in an electric variable valve timing (electric VCT) device provided in association with a vehicle engine, for example. The brushless motor M is configured by integrally assembling a control circuit 12 for driving and controlling the motor main body 11 with respect to the motor main body 11 constituted by a Landell type motor.

  The brushless motor M includes a yoke housing 60, an end frame 70, and a motor cover 80 as the motor case 13. As the motor body 11, a yoke housing 60 and an end frame 70 are used. The motor body 11 has various motor components such as a stator 20 fixed to an inner peripheral surface of a yoke housing 60 having a bottomed cylindrical shape, a rotor 30 rotatably disposed inside the stator 20 and having a rotating shaft 14. The end frame 70 is assembled so as to close the opening of the yoke housing 60. The rotary shaft 14 is pivotally supported by a bearing 15 having a portion slightly distal to the axial central portion accommodated and fixed in the bearing accommodating portion 61 of the yoke housing 60, and a base end portion accommodated in the bearing accommodating portion 71 of the end frame 70. It is supported by a fixed bearing 16. The rotating shaft 14 is made of nonmagnetic stainless steel, the bearings 15 and 16 are made of nonmagnetic metal, and the end frame 70 is made of nonmagnetic aluminum. The control circuit 12 is accommodated on the opposite side of the end frame 70 provided on the base end side of the motor body 11 from the yoke housing 60, and is covered with a motor cover 80 assembled to the end frame 70.

  A joint member 17 is attached to the tip of the rotating shaft 14 protruding from the yoke housing 60. The joint member 17 is connected to the adjustment mechanism in order to transmit the rotation output from the motor M (the motor body 11) to the adjustment mechanism (not shown) of the electric VCT apparatus. The adjustment mechanism is connected to a cam rotation shaft (not shown) that opens and closes an engine valve (not shown). In other words, the operation mode of the cam rotation shaft is adjusted by the rotation output from the motor M via the adjustment mechanism, and the opening / closing timing of the intake-side and exhaust-side engine valves is adjusted.

Next, a detailed configuration of the brushless motor M will be described.
[Stator]
As shown in FIGS. 1 and 2, the stator 20 has an annular stator core 21. The stator core 21 is provided with a plurality of teeth 22 extending radially inward at an equal pitch in the circumferential direction. Each tooth 22 has a tooth shape in which the radially inner end forms a T shape, and the radially inner peripheral surface thereof is formed by an arc surface centering on the rotation axis L of the rotation shaft 14. Each of the teeth 22 is wound with each of three-phase windings via an insulator 23. Specifically, a three-phase winding, that is, a U-phase winding 24, a V-phase winding 25, and a W-phase winding 26 are sequentially wound around twelve teeth 22 by, for example, concentrated winding. ing. A three-phase drive current is supplied to the wound windings 24, 25, and 26 to form a rotating magnetic field in the stator 20, and the rotor 30 disposed inside the stator 20 is rotated forward and backward.

[Rotor]
As shown in FIGS. 1 to 3, the rotor 30 includes first and second rotor cores 31 and 41, a field magnet 50, a rectifying magnet 51, and a sensor magnet 55.

[First rotor core]
The first rotor core 31 is formed of an electromagnetic steel plate made of a soft magnetic material and is disposed on the end frame 70 side. The first rotor core 31 has a substantially disk-shaped first core base 32, and a through hole 32a penetrating in the axial direction is formed at the center position. A substantially cylindrical boss portion 32b is formed to protrude from the outer peripheral portion of the through hole 32a on the end frame 70 side. The through hole 32a and the boss portion 32b are simultaneously formed by burring. The outer diameter of the boss portion 32 b is shorter than the outer diameter of the bearing 16 that rotatably supports the base end portion of the rotating shaft 14, that is, the inner diameter of the bearing housing portion 71 that houses and fixes the bearing 16 provided on the end frame 70. Is formed.

  The rotary shaft 14 is press-fitted into the through hole 32 a (boss portion 32 b), and the first core base 32 is fixed to the rotary shaft 14 by pressure. At this time, the first core base 32 is firmly pressure-bonded to the rotating shaft 14 by forming the boss portion 32b. And when this 1st core base 32 is pressure-bonded and fixed to the rotating shaft 14, the boss | hub part 32b is arrange | positioned so that it may space apart in the axial direction with respect to the bearing 16 accommodated and fixed to the bearing accommodating part 71 ( (See FIG. 1).

  A plurality (four in the present embodiment) of first claw-shaped magnetic poles 33 are projected on the outer peripheral surface 32c of the first core base 32 at equal intervals so as to protrude radially outward and extend in the axial direction. Here, in the first claw-shaped magnetic pole 33, a portion protruding radially outward from the outer peripheral surface 32 c of the first core base 32 is referred to as a first base portion 34, and a tip portion bent in the axial direction is a first magnetic pole portion 35. That's it.

  Both end surfaces 33a and 33b in the circumferential direction of the first claw-shaped magnetic pole 33 composed of the first base portion 34 and the first magnetic pole portion 35 extend in the radial direction (not inclined with respect to the radial direction when viewed from the axial direction). It has become. The angle in the circumferential direction of each first claw-shaped magnetic pole 33, that is, the angle between the circumferential end surfaces 33a and 33b is set smaller than the angle of the gap between the first claw-shaped magnetic poles 33 adjacent in the circumferential direction. .

  Further, the radially outer surface 36 of the first magnetic pole portion 35 has a concentric circular arc surface in which the axial orthogonal cross-sectional shape is centered on the rotation axis L of the rotating shaft 14, and two radially outer surfaces 36 are provided on the radially outer surface 36. An auxiliary groove 37 is provided. The auxiliary grooves 37 are formed at positions shifted by the same angle on both sides from the circumferential center of the radially outer surface 36. The auxiliary groove 37 has a U-shaped cross section in the direction perpendicular to the axis, that is, a bottom surface formed of a curved surface.

[Second rotor core]
The second rotor core 41 has the same material and the same shape as the first rotor core 31 and is disposed on the yoke housing 60 side. The second rotor core 41 has a disk-shaped second core base 42, and a through hole 42a penetrating in the axial direction is formed at the center position. A substantially cylindrical boss portion 42b is formed to protrude from the outer peripheral portion of the through hole 42a on the yoke housing 60 side. The through hole 42a and the boss portion 42b are simultaneously formed by burring. The outer diameter of the boss portion 42 b is shorter than the outer diameter of the bearing 15 that rotatably supports the tip side portion of the rotating shaft 14, that is, the inner diameter of the bearing housing portion 61 that houses and fixes the bearing 15 provided in the yoke housing 60. Is formed.

  The rotary shaft 14 is press-fitted and inserted into the through hole 42a (boss portion 42b), and the second core base 42 is fixed to the rotary shaft 14 by pressure. At this time, by forming the boss portion 42b, the second core base 42 is firmly crimped and fixed to the rotating shaft 14. When the second core base 42 is pressure-bonded and fixed to the rotating shaft 14, the boss portion 42 b is arranged so as to be separated from the bearing 15 accommodated and fixed in the bearing accommodating portion 61 in the axial direction. (See FIG. 1).

  On the outer peripheral surface 42c of the second core base 42, a plurality of (four in the present embodiment) second claw-shaped magnetic poles 43 project outward in the radial direction and extend in the axial direction at equal intervals. Here, in the second claw-shaped magnetic pole 43, a portion protruding radially outward from the outer peripheral surface 42 c of the second core base 42 is referred to as a second base portion 44, and a tip portion bent in the axial direction is referred to as a second magnetic pole portion 45. That's it.

  Both end surfaces 43a and 43b in the circumferential direction of the second claw-shaped magnetic pole 43 including the second base portion 44 and the second magnetic pole portion 45 are flat surfaces extending in the radial direction. The angle in the circumferential direction of each second claw-shaped magnetic pole 43, that is, the angle between the circumferential end surfaces 43a and 43b is set to be smaller than the angle of the gap between the second claw-shaped magnetic poles 43 adjacent in the circumferential direction. .

  Further, the radially outer surface 46 of the second magnetic pole portion 45 has a concentric circular arc surface in which the cross-sectional shape in the axis orthogonal direction is centered on the rotation axis L of the rotating shaft 14, and two radially outer surfaces 46 are provided on the radially outer surface 46. An auxiliary groove 47 is provided. The auxiliary grooves 47 are formed at positions shifted by the same angle on both sides from the circumferential center of the radially outer surface 46. The auxiliary groove 47 has a U-shaped cross section in the direction perpendicular to the axis, that is, a bottom surface that is a curved surface.

  The second rotor core 41 is combined with the second claw-shaped magnetic poles 43 so as to face the first rotor core 31 such that the second claw-shaped magnetic poles 43 are located between the first claw-shaped magnetic poles 33 of the first rotor core 31. At this time, the field magnet 50 is interposed between the inner side surface 42 d of the second core base 42 and the inner side surface 32 d of the first core base 32.

[Field magnet]
As shown in FIG. 3, the field magnet 50 is a disk-shaped permanent magnet, and a through hole 50a is formed at the center thereof. In the field magnet 50, a cylindrical sleeve 50b is inserted into the through hole 50a. The sleeve 50b is made of a non-magnetic material and is made of the same stainless steel as the rotating shaft 14 in this embodiment. The outer diameter of the field magnet 50 is set to coincide with the outer diameters of the first and second core bases 32 and 42. Accordingly, the outer peripheral surface 50 c of the field magnet 50 is flush with the outer peripheral surfaces 32 c and 42 c of the first and second core bases 32 and 42.

  The field magnet 50 is magnetized in the axial direction, and is magnetized so that the first rotor core 31 side is an N pole and the second rotor core 41 side is an S pole. Therefore, by this field magnet 50, the first claw-shaped magnetic pole 33 of the first rotor core 31 functions as an N pole, and the second claw-shaped magnetic pole 43 of the second rotor core 41 functions as an S pole.

  Therefore, the rotor 30 of the present embodiment is a so-called Landel type rotor using the field magnet 50. In the rotor 30, first claw-shaped magnetic poles 33 that are N poles and second claw-shaped magnetic poles 43 that are S poles are alternately arranged in the circumferential direction, and the number of magnetic poles is eight. That is, in the brushless motor M of the present embodiment, the number of poles of the rotor 30 is set to 2 × n (where n is a natural number), and the number of teeth 22 of the stator 20 is set to 3 × n. The number of poles of the rotor 30 is set to “8”, and the number of teeth 22 of the stator 20 is set to “12”.

[Rectifier magnet (auxiliary magnet)]
The rotor 30 includes a rectifying magnet 51 as an auxiliary magnet on the outer peripheral side of the field magnet 50. The rectifying magnet 51 is formed in an annular shape. The field magnet 50 and the rectifying magnet 51 are made of different materials. Specifically, the field magnet 50 is an anisotropic sintered magnet, for example, and is composed of, for example, a ferrite magnet, a samarium cobalt (SmCo) magnet, a neodymium magnet, or the like. The rectifier magnet 51 is, for example, a bond magnet (plastic magnet, rubber magnet, etc.), and is composed of a rare earth magnet such as a samarium iron nitrogen (SmFeN) magnet, a samarium cobalt (SmCo) magnet, a neodymium magnet, or the like.

  As shown in FIG. 3, the rectifier magnet 51 has back magnet portions 52 and 53 and an interpole magnet portion 54, and suppresses leakage magnetic flux in each of the back magnet portions 52 and 53 and the interpole magnet portion 54. It is a magnetized polar anisotropic magnet.

  Specifically, the one back magnet portion 52 is disposed between the inner peripheral surface of the first magnetic pole portion 35 of the first claw-shaped magnetic pole 33 and the outer peripheral surface 42 c of the second core base 42. The back magnet portion 52 has a side that contacts the inner peripheral surface of the first magnetic pole portion 35 as the N pole having the same polarity as the first magnetic pole portion 35 and a side that contacts the outer peripheral surface 42c of the second core base 42 as the first magnetic pole portion 35. The radial component is mainly magnetized so as to be the S pole having the same polarity as the two-core base 42.

  The other back magnet portion 53 is disposed between the inner peripheral surface of the second magnetic pole portion 45 of the second claw-shaped magnetic pole 43 and the outer peripheral surface 32 c of the first core base 32. The back magnet portion 53 has a side that contacts the inner peripheral surface of the second magnetic pole portion 45 as the S pole having the same polarity as the second magnetic pole portion 45, and a side that contacts the outer peripheral surface 32c of the first core base 32 as the first magnetic pole portion 45. The radial component is mainly magnetized so as to be an N pole having the same polarity as the one core base 32.

  The interpole magnet portion 54 is disposed between the first claw-shaped magnetic pole 33 and the second claw-shaped magnetic pole 43 in the circumferential direction. The interpolar magnet portion 54 is magnetized mainly in the circumferential direction so that the first claw-shaped magnetic pole 33 side becomes the N pole and the second claw-shaped magnetic pole 43 side becomes the S pole in the circumferential direction.

[Sensor magnet]
The sensor magnet 55 is substantially rectangular in cross section and has an annular shape, but the central portion in the radial direction is a fixing surface 55a for fixing the fixing portion A on the main body side of the rotor 30 on one end surface in the axial direction. ing. The fixed surface 55 a is an annular flat surface provided over the entire circumference of the sensor magnet 55.

  On the other hand, as the fixing portion A on the main body side of the rotor 30 for fixing the sensor magnet 55, an annular surface straddling the first rotor core 31 and the rectifying magnet 51, specifically, the first portion of the first core base 32 is provided. An annular ring that is substantially flush with the circumferential direction formed by the end face of the first base 34 in the one-claw-shaped magnetic pole 33 and the end faces of the back magnet parts 52 and 53 and a part of the end face of the interpolar magnet part 54 in the rectifier magnet 51. It is a flat surface.

  The sensor magnet 55 is pressed and fixed to the fixing part A with an adhesive applied between the fixing surface 55a and the fixing part A on the main body side of the rotor 30. Thus, the sensor magnet 55 is bonded and fixed so that its own magnetic pole and the magnetic pole of the rotor 30, that is, the first and second claw-shaped magnetic poles 33 and 43 correspond to each other.

[Magnetic sensor]
Further, in the brushless motor M of the present embodiment, a magnetic sensor 56 such as a Hall IC that is opposed to the sensor magnet 55 with a predetermined interval in the axial direction is provided on the circuit board 12 a of the control circuit 12. Here, the circuit board 12 a of the control circuit 12 is disposed on the surface of the end frame 70 opposite to the yoke housing 60, but the magnetic sensor 56 is connected via a through window 70 a provided in the end frame 70. It faces the sensor magnet 55. Then, when the sensor magnet 55 rotates integrally with the rotor 30, the magnetic sensor 56 outputs a detection signal corresponding to the magnetic pole of the sensor magnet 55. Upon receiving the detection signal from the magnetic sensor 56, the control circuit 12 calculates the rotational position (angle) of the rotor 30 based on the detection signal, calculates the rotational speed (speed), etc., and controls the drive of the brushless motor M. Do.

Next, the structure of the motor case 13 which is a characteristic part of the brushless motor M as the Landell type motor of this embodiment will be described.
As described above, the motor case 13 of the motor M of the present embodiment includes the yoke housing 60, the end frame 70, and the motor cover 80.

  As shown in FIG. 4, a flange portion 62 extending outward in the radial direction of the yoke 60 is formed in the opening 60 a of the yoke 60. The flange portion 62 is formed with yoke-side attachment portions 63 protruding outward in the radial direction at three substantially equal intervals in the circumferential direction. The yoke side mounting portion 63 is for fixing the brushless motor M to the outside (that is, the mounting position of the motor M in the vehicle), and a fixing screw (not shown) is inserted into each yoke side mounting portion 63. A mounting hole 63a is formed. The flange 62 is formed with yoke-side caulking portions 64 at two locations on the opposite sides of the center. Each yoke-side caulking portion 64 protrudes radially outward from the outer peripheral edge of the flange portion 62, and is bent so that its tip end faces the control circuit 12 side (the side opposite to the bottom portion 60b of the yoke 60). Further, the front end portion of each yoke-side caulking portion 64 is bifurcated, and the interval between them is widened during caulking (FIG. 4 shows an already widened state as in the drawings after FIG. 5). .

  The end frame 70 has a flat plate portion 72 that entirely covers the opening 60 a of the yoke 60, and a side wall 73 that is erected on the opposite side of the yoke 60 along the peripheral portion of the flat plate portion 72 (the peripheral portion of the end frame 70). And have. The end surface 73 a of the side wall 73 has a planar shape orthogonal to the axial direction of the rotating shaft 14 and serves as a contact surface (fixed surface) with the motor cover 80. A groove 73b extending along the longitudinal direction of the end surface 73a is recessed in the end surface 73a.

  Further, yoke fixing portions 74 are formed at two positions corresponding to the yoke-side caulking portion 64 on the peripheral edge portion of the end frame 70. Each yoke fixing portion 74 is formed with a locking recess 74a that penetrates the yoke fixing portion 74 in the axial direction and opens radially outward. When the end frame 70 is fixed to the yoke 60, the end frame 70 is overlapped with the flange portion 62, and the two yoke side caulking portions 64 are inserted into the locking recesses 74 a of the corresponding yoke fixing portions 74 from the axial direction. Is done. The yoke-side caulking portion 64 is caulked against the yoke fixing portion 74 by expanding the bifurcated portion of the tip end portion of each yoke-side caulking portion 64, so that the end frame 70 is fixed to the yoke 60. Thus, the yoke-side caulking portion 64 is locked to the yoke fixing portion 74, whereby the end frame 70 is fixed to the opening 60a side of the yoke 60 (see FIG. 5).

  Further, base-side attachment portions 75 are formed at three locations corresponding to the yoke-side attachment portions 63 on the peripheral edge portion of the end frame 70. Each base-side mounting portion 75 is for fixing the motor M together with the yoke-side mounting portion 63, and each base-side mounting portion 75 has a mounting hole 75a through which a fixing screw (not shown) is inserted. Is formed. Locked portions 76 are formed at three positions near the base-side attachment portions 75.

  In addition, a connector portion 77 protruding outward from the side wall 73 is formed at the peripheral edge portion of the end frame 70. The connector portion 77 includes a connector terminal (not shown) electrically connected to the control circuit 12 therein. This connector portion 77 is connected to an external connector (not shown) for power feeding.

  As shown in FIGS. 4 and 5, a bearing accommodating portion 71 is provided at a substantially central portion of the flat plate portion 72. The bearing housing 71 has a bearing housing recess 71a that protrudes in a circular shape on the opposite side of the yoke 60 and opens on the yoke 60 side (see FIG. 1). An end surface 71 b opposite to the yoke 60 in the bearing accommodating portion 71 in the axial direction has a planar shape orthogonal to the axial direction of the rotating shaft 14 and is located on the same plane as the end surface 73 a of the side wall 73. A substantially cross-shaped groove 71 c is recessed in the end surface 71 b of the bearing housing portion 71.

  Further, on the surface of the end frame 70 opposite to the yoke 60, first to third reinforcing ribs 91 to 93 extending from the outer peripheral surface of the bearing housing portion 71 to the inner surface of the side wall 73 are erected on the flat plate portion 72. ing. The end surfaces 91a to 93a of the first to third reinforcing ribs 91 to 93 have a planar shape orthogonal to the axial direction of the rotating shaft 14, and are located on the same plane as the end surface 73a of the side wall 73 and the end surface 71b of the bearing housing portion 71. To do. These first to third reinforcing ribs 91 to 93 are provided to increase the rigidity of the end frame 70 (bearing housing portion 71, flat plate portion 72, etc.). Further, grooves 91b to 93b extending along the longitudinal direction of the end surfaces 91a to 93a are recessed in the end surfaces 91a to 93a of the first to third reinforcing ribs 91 to 93.

  The first to third reinforcing ribs 91 to 93 also serve to partition the inner space of the side wall 73. The first reinforcing rib 91 is arranged at a position slightly shifted in the clockwise direction of the connector portion 77. The second reinforcing rib 92 is disposed at a position shifted by about 45 ° in the clockwise direction from the first reinforcing rib 91, and the third reinforcing rib 93 is positioned at a position shifted by about 90 ° in the clockwise direction from the second reinforcing rib 92. Is arranged.

  That is, a space in the range of about 225 ° between the first reinforcing rib 91 and the third reinforcing rib 93 adjacent to the connector portion 77 serves as a control circuit housing recess 78. As will be described later, the control circuit housing recess 78 is further divided into a board housing recess 78a on the side close to the connector portion 77 and a power supply terminal housing recess 78b on the side far from the connector portion 77. The boundary between the substrate housing recess 78a and the power supply terminal housing recess 78b is a groove 98b provided on the terminal portion 94 mounted on the control circuit board 12a. The groove 98b is further radially displaced from the first reinforcing rib 91 in the counterclockwise direction by about 135 ° and from the third reinforcing rib 93 in the clockwise direction at a position slightly shifted counterclockwise. The groove extends slightly obliquely with respect to the straight line.

  The control circuit housing recess 78 houses the control circuit 12 that controls the drive of the motor body 11. The control circuit 12 includes a flat circuit board 12a on which various electronic components are mounted. The circuit board 12a is accommodated in the board accommodating recess 78a with its thickness direction directed in the axial direction of the rotary shaft 14, and is flattened by screws 12b inserted into mounting holes (not shown) provided in the circuit board 12a. It is fixed to the part 72. The control circuit 12 (circuit board 12a) is electrically connected to a connector terminal constituting the connector portion 77, and is electrically connected to the outside through the connector terminal.

  A terminal portion 94 is mounted on the edge of the control circuit 12 (circuit board 12a) opposite to the connector portion 77. The terminal portion 94 is configured such that three power supply terminals 95 to 97 are accommodated in the case member 98, and the tips of the power supply terminals 95 to 97 protrude from the case member 98 as connection portions 95a to 97a. The upper surface 98a of the case member 98 has a planar shape perpendicular to the axial direction of the rotating shaft 14 in the assembled state, and is located on the same plane as the end surface 73a of the side wall 73 and the end surface 71b of the bearing housing portion 71. The case member 98 is disposed so as to divide the control circuit accommodating recess 78 into a substrate accommodating recess 78a and a power supply terminal accommodating recess 78b. The upper surface 98a of the case member 98 is counterclockwise from the first reinforcing rib 91. A groove 98b extending slightly obliquely with respect to the radial straight line is formed at a position slightly deviated counterclockwise from the position of about 135 ° (about 90 ° clockwise from the third reinforcing rib 93). Yes.

  More than half of the case member 98 is located in the power supply terminal accommodating recess 78b, and the connection portions 95a to 97a of the power supply terminals 95 to 97 are exposed in the power supply terminal accommodating recess 78b. A connection hole 72a that penetrates the flat plate portion 72 is formed at a position corresponding to each of the connection portions 95a to 97a in the flat plate portion 72 in the power supply terminal accommodating recess 78b. In the connection hole 72 a, the connection end portions 24 a to 26 a of the windings 24 to 26 of the respective phases of the stator 20 are inserted and connected to the connection portions 95 a to 97 a of the terminal portion 94, respectively. Thus, the windings 24 to 26 are electrically connected to the control circuit 12 (circuit board 12a).

  A space in the range of about 90 ° between the second reinforcing rib 92 and the third reinforcing rib 93 serves as a neutral point terminal accommodating recess 79. An arrangement hole 72 b is formed in the flat plate portion 72 in the neutral point terminal accommodating recess 79. And in the arrangement | positioning hole 72b, the neutral point terminal 99 which mutually connects the neutral points 24b-26b of the windings 24-26 of each phase of the stator 20 is arrange | positioned in the insertion state. Note that the space in the range of about 45 ° between the first reinforcing rib 91 and the second reinforcing rib 92 is not particularly used as a housing recess.

  As shown in FIGS. 4 and 5, the motor cover 80 is disposed on the side opposite to the yoke 60 with respect to the end frame 70 and covers the control circuit 12 housed in the control circuit housing recess 78. The motor cover 80 has a plate shape and has bent pieces 81 at three positions on the periphery, and each bent piece 81 is bent and latched with respect to the locked portion 76 of the end frame 70. And attached to the end frame 70. The motor cover 80 is attached so as to come into contact with the end surface 73a of the side wall 73 of the end frame 70, the end surface 71b of the bearing housing portion 71, and the end surfaces 91a to 93a of the first reinforcing ribs 91 to 93, respectively.

  In addition, when the motor cover 80 is attached to the end frame 70, the adhesive X is applied to various places, and the motor cover 80 is fixed to the end frame 70 in combination with the fixing by the bent piece 81, and is also waterproof / dustproof. Make it work.

  As shown in FIG. 6, in this embodiment, the adhesive X is applied in an annular shape along the end surface 73 a of the side wall 73 of the end frame 70 (in FIG. 6, a thick broken line P), and water from the outside of the side wall 73, Intrusion of foreign matter such as dust is prevented. Since the adhesive X can enter the groove 73b formed on the end face 73a of the side wall 73, the holding power of the adhesive X entering the groove 73b is high, and a labyrinth structure is formed so that the foreign matter becomes the side wall 73. It has a structure that is harder to penetrate inside.

  Further, the adhesive X is applied so as to straddle between the opposing portions of the side wall 73 continuously on the end surface 92a of the second reinforcing rib 92, the end surface 71b of the bearing housing portion 71, and the groove 98b of the terminal portion 94 (in FIG. 6). , Thick line Q), feeding terminal accommodating recess 78b, neutral point terminal accommodating recess 79, and substrate accommodating recess 78a are spatially separated. That is, the power supply terminal accommodating recess 78b and the neutral point terminal accommodating recess 79 communicate with the inside of the motor body 11 through the connection hole 72a and the arrangement hole 72b provided in the respective parts, and therefore the motor body generated in the use process and the manufacturing process. 11 is prevented from entering the substrate housing recess 78a. It is possible to prevent a short circuit breakage or the like caused by foreign matter adhering to the control circuit 12. The adhesive X can enter each of the groove 92b formed on the end surface 92a of the second reinforcing rib 92, the groove 71c formed on the end surface 71b of the bearing housing portion 71, and the groove 98b of the terminal portion 94. Similar to the above, the holding power of the adhesive X entering the grooves 92b, 71c, 98b is high, and a labyrinth structure is formed so that foreign matter is less likely to enter the substrate housing recess 78a side.

Next, characteristic effects of the present embodiment will be described.
(1) The end frame 70 of the brushless motor M (motor body 11) of the present embodiment includes a substrate housing recess 78a that houses the control circuit 12 (circuit board 12a) in a side wall 73 along the peripheral edge, and a motor body. 11 have communication holes (connection holes 72a, arrangement holes 72b) communicating with the interior of the apparatus. And the board | substrate accommodation recessed part 78a and the communicating hole (connection hole 72a, arrangement | positioning hole 72b) are the 1st-3rd reinforcement ribs 91-93 which function as a separation wall, the bearing accommodating part 71, and the case member 98 of the terminal part 94. Separated. The motor cover 80 is coated with an adhesive X between the end surface 73 a of the side wall 73 of the end frame 70, and the motor cover in each of the second reinforcing rib 92, the bearing housing portion 71, and the case member 98 of the terminal portion 94. Adhesive X is applied so as to continuously straddle between the facing portions of the side wall 73 at the facing surfaces (end surfaces 92a, 71b, upper surface 98a). That is, including the first to third reinforcing ribs 91 to 93 constituting the separation wall, the bearing accommodating portion 71 and the case member 98 of the terminal portion 94 and the adhesive X, the substrate accommodating recess 78a and the communication holes (connection holes 72a, Separation from the arrangement hole 72b) is achieved. As a result, foreign matter from the motor main body 11 generated in the use process and the manufacturing process is transferred from the communication hole (connection hole 72a, arrangement hole 72b) of the end frame 70 to the board housing recess 78a side, that is, the control circuit 12 (circuit board 12a) side. Intrusion can be easily suppressed.

  (2) The motor cover 80 is not only bonded and fixed to the side wall 73 at the peripheral edge of the end frame 70 but also fixed to the second reinforcing rib 92, the bearing accommodating portion 71, and the case member 98 of the terminal portion 94. The rigidity of the end frame 70 and the motor cover 80 is increased. As a result, rubbing between the end frame 70 and the motor cover 80 is difficult to occur, and foreign matter is less likely to be generated. Further, the quietness of the end frame 70 and the motor cover 80 is increased, which can contribute to noise reduction of the brushless motor M.

  (3) Since the case members 98 of the first to third reinforcing ribs 91 to 93, the bearing accommodating portion 71, and the terminal portion 94 function as a separation wall that separates the substrate accommodating recess 78a and the connection hole 72a, the component The increase in score can be suppressed.

In addition, you may change the said embodiment as follows.
In the above embodiment, the grooves 73b, 91b to 93b, and 98a are formed in the end surface 73a of the side wall 73 of the end frame 70, the end surfaces 91a to 93a of the reinforcing ribs 91 to 93, and the upper surface 98a of the case member 98 of the terminal portion 94, respectively. However, any one or all of them may be omitted.

  Although not particularly mentioned in the above embodiment, when the brushless motor M (motor body 11) is applied to an apparatus that is installed and used so that the axial direction of the rotary shaft 14 intersects the vertical direction, FIG. An arrangement structure in which the substrate housing recess 78a is positioned on the upper side of the communication holes (connection holes 72a, arrangement holes 72b) communicating with the inside of the motor body 11 as indicated by the arrows in FIG. In this way, foreign substance intrusion from the communication hole (connection hole 72a, arrangement hole 72b) into the board housing recess 78a, that is, the control circuit 12 (circuit board 12a) can be more reliably suppressed due to gravity.

  In the above embodiment, the adhesive X is continuously applied across the second reinforcing rib 92, the bearing accommodating portion 71, and the case member 98 of the terminal portion 94 except for the side wall 73 of the end frame 70. Not limited to this. For example, in this case, it may be applied discontinuously. Moreover, you may apply | coat to the whole end surface 71b of the bearing accommodating part 71, and the whole upper surface 98a of the case member 98 of the terminal part 94. FIG.

  For example, it is good also as an application | coating aspect of an adhesive agent as shown in FIGS. In any of the examples, an adhesive is applied to the side wall 73 of the end frame 70. 7 to 11, the illustration of the motor cover 80 is omitted.

  In the mode shown in FIGS. 7 and 8, the adhesive X on the end surface 92 a of the second reinforcing rib 92 is in the vicinity of the side wall 73 of the second reinforcing rib 92 in the application mode shown in FIG. 6 of the above embodiment. It is applied to slightly before the side wall 73. The adhesive X is also applied to the end surface 91 a of the first reinforcing rib 91 and the end surface 93 a of the third reinforcing rib 93. The adhesive X on the end surfaces 91a and 93a of the first and third reinforcing ribs 91 and 93 is applied to the front side on the bearing housing portion 71 side and continuously applied to the side wall 73 on the side wall 73 side. The third reinforcing rib 93 has a bifurcated portion 93c bifurcated just before the side wall 73, and the adhesive X on the end surface 93a of the third reinforcing rib 93 is one side of the branched portion 93c in FIG. In FIG. 8, it is applied so as to be connected from the other side of the branch portion 93c to the side wall 73 side.

  In the embodiment shown in FIG. 9, each end surface 92 a, 71 b, 93 a is V-shaped so as to go from the side wall 73 side to the side wall 73 side again through the second reinforcing rib 92, the bearing housing portion 71, and the third reinforcing rib 93. The adhesive X is continuously applied to the substrate. The adhesive X on the end surface 93a of the third reinforcing rib 93 is applied up to the side of the side wall 73 but before the branch portion 93c. Also by this, the substrate accommodating recess 78a and the communication hole (arrangement hole 72b) of the end frame 70 are separated by the adhesive X together with the second and third reinforcing ribs 92 and 93 and the bearing accommodating portion 71. Figured. Further, the adhesive X is not used between the substrate housing recess 78a and the communication hole (connection hole 72a) of the end frame 70, but separation is achieved by the terminal portion 94 (case member 98).

  In the aspect shown in FIG. 10, the first reinforcing rib 91 and the outer peripheral edge of the end surface 71 b of the bearing housing 71 are rotated about 3/4 from the side wall 73 side to the connecting portion of the second reinforcing rib 92 in the counterclockwise direction. It is applied continuously. Also by this, separation between the substrate housing recess 78 a and the communication hole (arrangement hole 72 b) of the end frame 70 is achieved by the adhesive X together with the first reinforcing rib 91 and the bearing housing portion 71. Further, in this case, it is assumed that the installation state of the motor M is such that the second reinforcing rib 92 faces upward as indicated by an arrow α in FIG. 10 with the axial direction of the brushless motor M oriented substantially horizontally. A portion to which the adhesive X is applied so as to turn about 3/4 of the outer peripheral edge of the end surface 71b of the accommodating portion 71 becomes a circular concave shape suitable for collecting foreign matter. The installation state is not limited to this, and the motor M may be installed such that the second reinforcing rib 92 faces downward as shown by an arrow β in FIG. 10, that is, the control circuit housing recess 78 faces upward. Good.

  In the mode shown in FIG. 11, the application mode of the above embodiment in which the adhesive X is continuously applied from the side wall 73 side through the second reinforcing rib 92, the bearing housing portion 71, and the terminal portion 94 to the opposing portion of the side wall 73. In addition, the adhesive X is continuously applied from the bearing accommodating portion 71 to the middle of the third reinforcing rib 93. Further, in this case, it is assumed that the installation state of the motor M is such that the third reinforcing rib 93 faces upward as indicated by an arrow α in FIG. 11 with the axial direction of the brushless motor M oriented substantially horizontally. Both side portions of the third reinforcing rib 93 in the vicinity of the accommodating portion 71 are L-shaped concave shapes suitable for collecting foreign substances. Note that the installation state is not limited to this, and the motor M may be installed such that the third reinforcing rib 93 faces downward as shown by an arrow β in FIG. 11, that is, the substrate housing recess 78a faces upward. .

In the above embodiment, the motor M is a motor composed of a Landel type rotor, but may be a motor having another configuration.
The motor M may be mounted on the vehicle as a drive source for devices other than the valve timing adjusting device.

  M ... brushless motor, 11 ... motor body, 12 ... control circuit, 12a ... circuit board, 14 ... rotating shaft, 20 ... stator, 24-26 ... winding, 30 ... rotor, 60 ... yoke housing, 60a ... opening, DESCRIPTION OF SYMBOLS 70 ... End frame, 71 ... Bearing accommodation part, 80 ... Motor cover, 73 ... Side wall, 73a ... End surface, 94 ... Terminal part, 91-93 ... Reinforcement rib (separation wall), 78a ... Substrate accommodation recessed part, 72a ... Connection hole (Communication hole), 98 ... case member (separation wall), 71b, 91a to 93a ... end face (opposing face), 98a ... upper face (opposing face), 71c, 91b to 93b, 98b ... groove, X ... adhesive.

Claims (5)

A control circuit for controlling the driving of the motor body with respect to a motor body in which a stator and a rotor are housed in a bottomed cylindrical yoke housing and an opening of the yoke housing is closed by an end frame is the end frame. A brushless motor disposed on the opposite side of the yoke housing and covered with a motor cover,
The end frame includes a substrate housing recess for housing a circuit board of the control circuit in a side wall standing along a peripheral edge portion, and a communication hole communicating with the inside of the motor body. A separation wall separating the recess and the communication hole;
The motor cover has an adhesive interposed between end faces of the side walls of the end frame, and an adhesive is interposed in all or part of the surface of the separation wall facing the motor cover, A brushless motor characterized in that the substrate housing recess and the communication hole are separated from each other including the separation wall and the adhesive. The brushless motor according to claim 1,
The brushless motor according to claim 1, wherein the separation wall includes a reinforcing rib standing on the end frame other than the side wall. The brushless motor according to claim 1 or 2,
The brushless motor according to claim 1, wherein the separation wall includes a case member of a terminal portion provided on the circuit board for connection with the winding of the stator. In the brushless motor according to any one of claims 1 to 3,
A brushless motor, wherein a groove is formed in a portion of the separation wall where the adhesive is applied. In the brushless motor according to any one of claims 1 to 4,
It is installed and used so that the axial direction of the rotating shaft of the motor body intersects the vertical direction,
The brushless motor is configured by an arrangement structure in which the substrate housing recess is positioned above the communication hole communicating with the interior of the motor body.

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