KR100982834B1 - Brushless motor - Google Patents

Abstract

An object of the present invention is to provide a brushless motor capable of suppressing vibration of a circuit board and reducing the number of parts and the number of steps.

In the circuit board 30, a plurality of through holes 33 are formed outside the region where the FG coil pattern 32 is formed. The fixing plate 22 is formed in the attachment plate 20 at a position corresponding to the through hole 33. The first protrusion 222a and the second protrusion 222b are inserted into the through hole 33 in a state in which the supporting portion 223 formed in the fixing portion 22 is in contact with the circuit board 30. In the 1st protrusion part 222a and the 2nd protrusion part 222b, the part which protruded on the upper surface side of the circuit board 30 is bent in the direction perpendicular | vertical to the rotating shaft J1. At this time, the first protrusion 222a and the second protrusion 222b are bent in opposite directions. As a result, the circuit board 30 is fixed to the attachment plate 20.

Description

Brushless Motor {BRUSHLESS MOTOR}

TECHNICAL FIELD This invention relates to the brushless motor which fixed the circuit board to the mounting plate for mounting to a mounting apparatus.

The brushless motor generates a rotational driving force by supplying a current according to the position of the magnetic pole of the rotor magnet to a predetermined coil. Each coil is supplied with electric current via the coil wiring etc. which were formed in the circuit board.

In addition to the coil wiring, the circuit board is provided with a pattern of a hall element for detecting the position of the magnetic pole of the rotor magnet, or a frequency generation coil (FG coil) for detecting the rotational speed of the rotor. The hall element outputs a hall signal corresponding to a change in magnetic flux density of the rotor magnet due to the rotation of the rotor. In addition, the FG (Frequency Generator) coil outputs the FG signal according to the change of the magnetic flux density of the FG magnet due to the rotation of the rotor. The controller of the brushless motor controls the amount of current supplied to each coil by using a hall signal, an FG signal, or the like.

Therefore, when the magnetic flux density of each magnet is changed by other factors such as vibration of the circuit board, it is not possible to obtain an accurate hall signal and FG signal. Thus, in order to prevent vibration of the circuit board, the circuit board is fixed to an attachment plate or the like for mounting on a housing or other device. For example, Patent Document 1 discloses a brushless motor that fixes a circuit board to a housing.

(Patent Document 1) Japanese Unexamined Patent Publication No. 2006-158013

The brushless motor disclosed by patent document 1 fixes the circuit board in which the coil wiring etc. were formed to the housing. Specifically, the support surface on which the circuit board is mounted and the plurality of protrusions are formed in the housing. In the state where the lower surface of the circuit board is mounted on the support surface of the housing, the plurality of protrusions are deformed so as to suppress the upper surface of the circuit board. In this way, the circuit board is fixed to the housing by suppressing both surfaces of the circuit board.

However, in the brushless motor disclosed by Patent Document 1, the position at which the circuit board is fixed is limited to the rotational axis of the motor, and the peripheral region of the circuit board is not fixed. For this reason, the circuit board tends to vibrate in a region far from the rotation axis. As mentioned above, when a circuit board vibrates, there exists a problem that a hall signal or an FG signal cannot be acquired correctly.

In addition to the brushless motor disclosed in Patent Literature 1, it may be conceivable to fix the circuit board to the attachment plate using a screw. Specifically, the vibration of the whole circuit board can be suppressed by screwing a circuit board to a mounting plate in the several place of the periphery area of a circuit board. However, when fixing a circuit board to a mounting plate by screwing, there exists a problem that component score and number of processes increase.

Accordingly, an object of the present invention is to provide a brushless motor capable of suppressing vibration of a circuit board and reducing component scores and number of steps in view of the above problems.

In order to solve the said subject, the invention of Claim 1 is provided with the motor drive part which comprises the rotor which rotates about a rotating shaft, and the drive circuit for driving the said motor drive part, The some which penetrates the upper surface and the lower surface. A motor mounting plate having a circuit board having a through hole formed therein, a plate-shaped board portion disposed substantially parallel to the circuit board, and a plate-shaped fixing portion provided corresponding to each through hole and integrally fixing the circuit board. And each of the fixing parts is formed in a state of being bent in the direction of the rotation axis with respect to the substrate part, and each of the fixing parts is in contact with a surface of the motor mounting plate side of the circuit board and supports the circuit board. And inserted into the respective through holes from the surface of the circuit board side of the circuit board, protruding from the respective through holes. Comprising output portion, the protruding portion is characterized in that a portion protruded from the respective through-holes are bent in a direction perpendicular to the rotation axis direction.

In the brushless motor of Claim 1, the invention of Claim 2 WHEREIN: The said protrusion part is the 1st protrusion part bent in the predetermined direction perpendicular | vertical to the said rotation axis direction, and the agent which is bent in the direction opposite to the said predetermined direction It characterized in that it comprises two protrusions.

In the invention according to claim 3, in the brushless motor according to claim 2, the predetermined direction is a direction perpendicular to the flat surface of the fixing part.

According to a fourth aspect of the present invention, in the brushless motor of the second aspect, the predetermined direction is a direction parallel to the flat surface of the fixed portion, and the first projection and the second projection are in a direction away from each other. It is characterized by being bent.

The invention according to claim 5 is the brushless motor according to any one of claims 2 to 4, wherein the first protrusion and the second protrusion are formed side by side on the flat surface of the fixed part in a state before bending. It is characterized by that.

According to a sixth aspect of the present invention, in the brushless motor according to the fifth aspect, the first protrusion and the second protrusion are formed in substantially parallel to the direction in which the respective through holes are formed in a state before bending. It is done.

Invention of Claim 7 WHEREIN: In the brushless motor of Claim 1, the said protruding part is a hook-shaped shape. It is characterized by the above-mentioned.

Invention of Claim 8 WHEREIN: In the brushless motor of any one of Claims 1-7, each through hole is formed in the radially outer side of the said rotor, It is characterized by the above-mentioned.

In the invention according to claim 9, in the brushless motor according to any one of claims 1 to 8, a coil pattern for detecting a rotational speed of the rotor is formed on the circuit board, and each through hole has the coil pattern. It is characterized in that it is formed in the radially outer side of.

In the invention according to claim 10, in the brushless motor according to any one of claims 1 to 9, each of the opening holes through the motor mounting plate is provided in the motor attachment plate at the boundary between each fixing part and the substrate part. The inner peripheral surface of each opening hole includes a 1st surface, and the said 1st surface is exposed to the space on the opposite side to the side which mounts the said circuit board, It is characterized by the above-mentioned.

Invention of Claim 11 WHEREIN: In the brushless motor of Claim 10, the said 1st surface is arrange | positioned substantially parallel with the said circuit board. It is characterized by the above-mentioned.

Invention of Claim 12 WHEREIN: The brushless motor of Claim 10 or 11 WHEREIN: The said 1st surface is bent by the jig, and the said projection part is bent.

In the brushless motor of the present invention, in a state where the circuit board is in contact with the supporting portion formed in the fixing portion, the protrusion formed in the fixing portion is inserted into the plurality of through holes formed in the circuit board.

And the circuit board is fixed to the motor mounting plate by the part which protruded to the upper surface side of the circuit board in a protrusion part bent in the direction perpendicular | vertical to a rotation axis. Accordingly, the number of parts and the number of steps of the brushless motor can be reduced rather than when the circuit board is fixed to the motor mounting plate using screws.

The protrusion has a first protrusion and a second protrusion, and the first protrusion and the second protrusion can be bent in the opposite direction and bend in a direction perpendicular to the flat surface of the fixing part. As a result, when the circuit board is fixed, the warpage of the circuit board can be prevented.

The first protrusion and the second protrusion may be bent in the opposite direction, and may be bent in a direction parallel to the flat surface of the fixing part. Also in this case, it becomes possible to prevent the occurrence of warpage or the like of the circuit board.

Moreover, by making the shape of the protrusion part into the shape of the rib which bend | folded the tip, the area | region which a protrusion part occupies on a circuit board can be made small, and a circuit board can be utilized effectively.

In addition, since the through hole is formed in the radially outer side of the coil pattern or the radially outer side of the rotor, the circuit board is fixed to the motor mounting plate in the peripheral region of the circuit board. Therefore, the vibration in the peripheral region of the circuit board can be suppressed.

In addition, by supporting the first surface exposed by the surface opposite to the circuit board, the jig can be bent in a state where no direct force is applied to the circuit board. Therefore, the circuit board can be fixed to the motor mounting plate without damaging or damaging the circuit board.

(First embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, the 1st Embodiment of this invention is described, referring drawings. 1 is a side sectional view of a brushless motor according to the present embodiment. The brushless motor 10 shown in FIG. 1 includes a shaft 11, a rotor 12, a housing 13, a stator core 14, a coil 15, a mounting plate 20, The circuit board 30 is provided.

In addition, the installation state differs by the mounting apparatus, and the brushless motor 10 is arrange | positioned in various directions. Therefore, the brushless motor 10 does not have an absolute up and down direction. However, in the following description, it demonstrates conveniently that the up-down direction on the figure of FIG. 1 is an up-down direction of the brushless motor 10. FIG.

The shaft 11 is arrange | positioned at the same axis as the rotating shaft J1. The rotor 12 is fixed to the shaft 11 and rotates integrally with the shaft 11 about the rotation axis J1. The rotor 12 also has a rotor holder 121 and a rotor magnet 122.

The rotor holder 121 is formed by pressing a metal plate. The rotor holder 121 has a disk-shaped lid portion 121a centered on the rotating shaft J1 and a cylindrical portion 12lb formed below the periphery of the lid portion 121a. The rotor magnet 122 is fixed to the inner circumferential surface of the cylindrical portion 12lb.

The housing 13 is provided with the cylindrical part 13a for holding the shaft 11, and the flange part 13b extended continuously in the round ring shape from the lower side of the cylindrical part 13a. The cylindrical portion 13a holds the shaft 11 freely by a plurality of ball bearings 16, 16, ... provided in the upper and bottom portions of the cylindrical portion 13a. Moreover, the some protrusion part is formed in the flange part 13b. The housing 13 is fixed to the attachment plate 20 by the pressure deformation of the plurality of protrusions formed on the flange portion 13b.

The stator core 14 is fixed to the outer circumferential side of the housing 13. The stator core 14 has a core back portion 14a composed of an annular shape around the rotational axis J1, and a plurality of teeth portions extending radially from the core back portion 14a about the rotational axis J1 ( 14b). The coil 15 is wound around each tooth portion 14b.

The attachment plate 20 is a board | substrate for fixing the brushless motor 10 to a mounting apparatus. The circuit board 30 includes a coil wiring (not shown) for supplying current to the coil 15, a hall element (not shown) for detecting the position of the magnetic pole of the rotor magnet 122, and an FG coil pattern 32. (See FIG. 6) and the like. The circuit board 30 is fixed to the attachment plate 20.

The attachment plate 20 and the circuit board 30 are disposed perpendicular to the rotation axis J1.

In the brushless motor 10 having the above-described configuration, the rotor 12 rotates when a controller (not shown) supplies a current according to the position of the magnetic pole of the rotor magnet 122 to the predetermined coil 15. . In this way, the brushless motor 10 obtains a rotational driving force.

(Configuration of Mounting Plate)

Hereinafter, the structure of the attachment plate 20 is demonstrated using FIGS. 2 is a plan view of the attachment plate 20 seen from above. 3 is a side view of the attachment plate 20 viewed from the arrow A direction in FIG. 2. 4 is a partially enlarged view of the mounting plate 20 in the region R1 shown in FIG. 3. FIG. 5 is a partially enlarged view of the mounting plate 20 in the region R2 shown in FIG. 3.

2 to 5 show the shape of the mounting plate 20 before the circuit board 30 is fixed to the mounting plate 20. When the circuit board 30 is attached to the mounting plate 20, the shape of the mounting plate 20 changes from the shape shown in FIGS. 2 to 5. In addition, the shape of the mounting plate 20 in the state in which the circuit board 30 is attached to the mounting plate 20 will be described later.

As shown in Figs. 2 and 3, the attachment plate 20 includes a substrate portion 21, a plurality of fixing portions 22, 22, ..., and a plurality of motor attachment portions 23, 23, ... It is composed of The attachment plate 20 is formed by press working a metal plate, and each component of the attachment plate 20 is integrally formed.

In the attachment plate 20, opening holes 24 are formed in the boundary portions of the substrate portion 21 and the fixing portions 22, respectively.

The board | substrate part 21 is a flat plate shape perpendicular | vertical to the rotating shaft J1. In the board | substrate part 21, the circular center hole 25 centered on the rotating shaft J1 is formed. The cylindrical portion 13a of the housing 13 is inserted into the center hole 25. In addition, a plurality of housing attaching holes 26, 26,... Are formed around the center hole 25. The diameters of the housing mounting holes 26, 26,... Are smaller than the diameter of the center hole 25. The housing mounting hole 26 is used to fix the housing 13 and the attachment plate 20. In the flange portion 13b of the housing 13, a plurality of protrusions corresponding to the housing mounting holes 26, 26, ... are formed. The housing 13 is attached by inserting the plurality of protrusions formed in the flange portion 13b into the housing mounting holes 26, 26, ..., respectively, and pressing and deforming the protrusions inserted into the housing mounting holes 26, respectively. It is fixed to the plate 20.

The housing 13 and the attachment plate 20 may be fixed by screwing. In this case, the through hole for screwing corresponding to the housing mounting holes 26, 26, ... is formed in the flange part 13b.

The fixing part 22 is a flat plate shape parallel to the rotating shaft J1 before the circuit board 30 is fixed to the attachment plate 20, and is formed by bending upward from the board part 21. The fixing part 22 is used when fixing the circuit board 30 to the attachment plate 20. In addition, although the example in which the fixing part 22 was formed in four places in the attachment plate 20 is shown in this embodiment, the position where the fixing part 22 is formed, and the number of the fixing parts 22 are the circuit board 30 You may change according to the position and shape of the wiring formed in this figure, the shape of the mounting plate 20, etc.

As shown to FIG. 4 and FIG. 5, the fixing part 22 is comprised by the arm part 221, the 1st protrusion part 222a, the 2nd protrusion part 222b, and the support part 223. As shown in FIG. The arm part 221 is flat plate shape parallel to the rotating shaft J1. The first protrusion 222a and the second protrusion 222b are formed to protrude upward from the tip of the arm portion 221 before the circuit board 30 is fixed to the mounting plate 20. That is, the 1st protrusion part 222a and the 2nd protrusion part 222b are formed in the state parallel to the flat surface of the arm part 221, before the circuit board 30 is fixed to the attachment plate 20. As shown in FIG.

In addition, the support part 223 is a plane perpendicular | vertical to the rotating shaft J1 formed in the both sides of the front-end | tip of the arm part 221. As shown in FIG. The support portion 223 is formed above the substrate portion 21. Thus, since the fixing part 22 before the circuit board 30 is being fixed is flat form, it becomes possible to form easily by press work.

The motor attachment part 23 is a flat plate shape perpendicular to the rotating shaft J1, and is formed below the board | substrate part 21. As shown in FIG. In the motor attachment part 23, the motor fixing hole 231 for attaching to the mounting apparatus which mounts the brushless motor 10 is formed. In addition, in this embodiment, although the example in which the motor attachment part 23 was formed in four places in the attachment plate 20 is shown, you may change the position and number of the motor attachment part 23 according to the mounting position of a mounting apparatus. .

The opening hole 24 is a hole penetrating the attachment plate 20. Moreover, the opening hole 24 is formed in the part which the mounting plate 20 curves as a boundary part of the fixing | fixed part 22 and the board | substrate part 21. As shown in FIG. When the circuit board 30 is fixed to the attachment plate 20, the support jig 42 (see FIGS. 12 and 13) for supporting the attachment plate 20 from the lower side is inserted into the opening hole 24. do. As shown to FIG. 4 and FIG. 5, the inner peripheral surface of the opening hole 24 is the plane substantially perpendicular to the rotating shaft J1, and the exposure surface 241 exposed below is formed.

(Configuration of Circuit Board)

Hereinafter, the circuit board 30 will be described with reference to FIG. 6. 6 is a plan view of the circuit board 30 viewed from above. The center hole 31, the FG coil pattern 32, and the plurality of through holes 33, 33... Are formed in the circuit board 30. In addition, in the circuit board 30 shown in FIG. 6, the display, such as the interface for connecting with a control part (not shown), the wiring for coils for supplying electric current to the coil 15, etc. is abbreviate | omitted.

The center hole 31 is a circular through hole formed around the rotation shaft J1. The cylindrical portion 13a of the housing 13 is inserted into the center hole 31.

The FG coil pattern 32 is a round ring-shaped coil pattern formed around the rotating shaft J1. The FG coil pattern 32 is formed at the position facing the lower end surface of the cylindrical part 121b of the rotor holder 121 shown in FIG. The lower end surface of the rotor magnet 122 alternately magnetizes the N pole and the S pole, and functions as an FG magnet. As the position of the magnetic pole of the FG magnet changes as the rotor 12 rotates, the FG signal is generated in the FG coil pattern 32.

The through hole 33 is a hole for inserting the first protrusion 222a and the second protrusion 222b formed in the attachment plate 20 when the circuit board 30 is fixed to the attachment plate 20. 6, the through hole 33 is formed in the outer side of the radial direction of the FG coil pattern 32 formed in the round ring shape. That is, the through hole 33 is formed not in the periphery of the center hole 31 of the circuit board 30 but in the peripheral region of the circuit board 30.

In addition, the direction in which the through hole 33 is formed coincides with the direction in which the first protrusion 222a and the second protrusion 222b are formed. This is because when the fixing part 22 is inserted into the through hole 33 at the time of fixing the circuit board 30 to be described later, the first protrusion 222a and the second protrusion 222b pass through the through hole 33. This is to make the size of the through hole 33 necessary to pass through as small as possible. Thereby, the degradation of the strength of the circuit board 30 due to the formation of the through holes 33, 33, ... can be prevented.

(Attaching Method of Circuit Board)

Hereinafter, a method of fixing the circuit board 30 to the mounting plate 20 will be described with reference to FIGS. 7 to 11. FIG. 7 is a plan view of the attachment plate 20 and the circuit board 30 viewed from above when the circuit board 30 is mounted on the attachment plate 20. FIG. 8 is a side view of the attachment plate 20 and the circuit board 30 shown in FIG. 7 as seen from the arrow A direction. 9 is a plan view of the attachment plate 20 and the circuit board 30 viewed from above when the circuit board 30 is fixed to the attachment plate 20. FIG. 10 is a side view of the attachment plate 20 and the circuit board 30 shown in FIG. 9 as seen from the arrow A direction. FIG. 11 is a partially enlarged view of the mounting plate 20 and the circuit board 30 in the region R5 shown in FIG. 10.

In addition, in FIG.7 and FIG.9, the display of the FG coil pattern 32 etc. which are formed in the circuit board 30 are abbreviate | omitted.

First, in order to fix the circuit board 30 to the attachment plate 20, the alignment of the attachment plate 20 and the circuit board 30 is performed. In other words, the first protrusion 222a and the second protrusion 222b formed in the attachment plate 20 are inserted into the through hole 33 formed in the circuit board 30 from the lower side of the circuit board 30. 7 and 8, the circuit board 30 is placed on the mounting plate 20 in a state where the lower surface of the circuit board 30 and the support part 223 formed on the mounting plate 20 are in contact with each other. Mount. The first protrusion 222a and the second protrusion 222b protrude from the upper surface side of the circuit board 30. Since the support portion 223 is formed above the substrate portion 21, a space is generated between the attachment plate 20 and the circuit board 30. This space makes it possible to provide a hall element or the like on the lower surface of the circuit board 30.

Next, the part which protruded on the upper surface side of the circuit board 30 among the 1st protrusion part 222a and the 2nd protrusion part 222b is bent in the direction perpendicular | vertical with respect to the flat surface of the arm part 221. As shown in FIG. 9 and 10, the first protrusion 222a and the second protrusion 222b may be bent in opposite directions. As a result, the circuit board 30 is fixed to the attachment plate 20.

Next, the shape of the fixing | fixed part 22 in the state in which the circuit board 30 was fixed to the attachment plate 20 is demonstrated in detail using FIG. As shown in FIG. 11, since the part which protruded on the upper surface side of the circuit board 30 in the 1st protrusion part 222a is bent in the direction perpendicular | vertical to the plate surface of the arm part 221, the tip is bent | folded. It becomes a curved crotch shape. In the first protrusion 222a, the bent portion is in contact with the upper surface of the circuit board 30. The same applies to the second protrusion 222b. In addition, as described above, the lower surface of the circuit board 30 is in contact with the support portion 223. Therefore, by bending the 1st protrusion part 222a and the 2nd protrusion part 222b to the perpendicular | vertical direction with respect to the flat surface of the arm part 221, the movement of the circuit board 30 up-down direction is regulated.

In addition, as described above, the first protrusion 222a and the second protrusion 222b may be bent in opposite directions. That is, as shown in FIG. 11, the first protrusion 222a may be bent in the outward direction of the circuit board 30, and the second protrusion 222b may be bent in the direction opposite to the direction in which the first protrusion 222a is bent. . As a result, the circuit board 30 is restricted in movement in the direction perpendicular to the rotation axis J1.

In FIG. 11, the state which expanded one of the some fixing | fixed part 22 formed in the mounting plate 20 is shown. However, also in the other fixing part 22, the movement of the circuit board 30 is regulated by bending the 1st protrusion part 222a and the 2nd protrusion part 222b as mentioned above. In this way, the circuit board 30 is fixed to the attachment plate 20 by restricting the movement of the circuit board 30 at a plurality of locations.

(Bending process of the protrusion)

Hereinafter, the bending process of the 1st protrusion part 222a and the 2nd protrusion part 222b is demonstrated concretely using FIGS. 12-14.

FIG. 12: is a figure which shows the state which has arrange | positioned the jig with respect to the fixing | fixed part 22 in area | region R3 shown in FIG. FIG. 13: is a figure which shows the state which has arrange | positioned the jig with respect to the fixing | fixed part 22 in area | region R4 shown in FIG. FIG. 14: is a figure which shows the deformation plates 411 and 412 which comprise the pressing jig 41. As shown in FIG. In addition, in FIG. 12 and FIG. 13, the display of the motor mounting part 23 etc. is abbreviate | omitted, and the display of the restricting plate 413 is abbreviate | omitted in FIG.

As shown in FIG. 12 and FIG. 13, the first protrusion 222a and the second protrusion 222b can be bent by the pressing jig 41 and the supporting jig 42. The pressing jig 41 presses the first protrusion 222a and the second protrusion 222b from above. The support jig 42 has a rectangular parallelepiped shape, and supports the attachment plate 20 from the lower side.

Next, the pressing jig 41 will be described in detail. The press jig 41 is comprised by the deformation plates 411 and 412 and two control plates 413, as shown in FIG. The deformation plate 411 is used for bending the first protrusion 222a. The recessed part 411a is formed in the bottom surface of the deformation | transformation board 411 in the position shifted from the center line C1, as shown in FIG. The deformation plate 412 is used to bend the second protrusion 222b. As shown in FIG. 14, the recessed part 412a is formed in the bottom surface of the deformation | transformation plate 412 at the position shifted from the center line C2. The restricting plate 413 regulates the bending directions of the first protrusion 222a and the second protrusion 222b.

As shown in FIG. 12, the pressing jig 41 is configured in a state in which the deformation plates 411 and 412 and the restricting plate 413 are stacked. At this time, the deformation plates 411 and 412 are stacked so that the recesses 411a and 412a are shifted from each other.

Next, the bending process of the 1st protrusion part 222a and the 2nd protrusion part 222b using the pressing jig 41 and the support jig 42 is demonstrated.

First, as shown in FIG. 12 and FIG. 13, the pressing jig 41 is disposed above the circuit board 30. In other words, the pressing jig 41 is disposed so that the recesses 411a and 412a are positioned immediately above the first protrusion 222a and the second protrusion 222b, respectively. The supporting jig 42 is inserted into the opening hole 24 formed in the attachment plate 20.

Then, the pressing jig 41 is gradually moved downward. The first protrusion 222a and the second protrusion 222b are bent in a direction perpendicular to the flat surface of the arm portion 221 by contacting the inner circumferential surfaces of the recesses 411a and 412a, respectively. At this time, since the positions of the recesses 411a and 412a are different, the first protrusion 222a and the second protrusion 222b are bent in opposite directions. At this time, since the pressing jig 41 does not contact the circuit board 30, a force from above is not directly applied to the circuit board 30.

In addition, when the pressing jig 41 contacts the first protrusion 222a and the second protrusion 222b, the upper surface of the supporting jig 42 contacts the exposed surface 241 of the opening hole 24. . Accordingly, the supporting jig 42 supports the attachment plate 20 from the lower side when the first protrusion 222a and the second protrusion 222b are bent. Therefore, the force from below is not directly applied to the circuit board 30 either.

After the pressing jig 41 moves to the predetermined position, the pressing jig 41 returns to the initial position. Thereby, the 1st protrusion part 222a and the 2nd protrusion part 222b bend in the direction perpendicular | vertical with respect to the flat surface of the arm part 221. As shown in FIG.

The bending process of the 1st protrusion part 222a and the 2nd protrusion part 222b mentioned above is performed simultaneously with respect to all the fixing parts 22. As shown in FIG. Therefore, when compared with the brushless motor which screwed the circuit board 30 to the attachment plate 20, the brushless motor 10 which concerns on this embodiment fixes the circuit board 30 to the attachment plate 20. FIG. Process water can be reduced.

In addition, by simultaneously performing the above-described bending process for all the fixing portions 22, the occurrence of distortion in the circuit board 30 can be suppressed. Therefore, an accurate Hall signal or FG signal can be acquired when the brushless motor 10 is driven.

As explained above, the brushless motor 10 which concerns on a present Example forms the some through-hole 33 in the circuit board 30, and forms the fixing part 22 in the attachment plate 20. As shown in FIG. The first protrusion 222a and the second protrusion 222b formed in the fixing portion 22 are inserted into the through hole 33, and the first protrusion 222a and the first protrusion 222a protrude toward the upper surface side of the circuit board 30. 2 The protrusion 222b is bent in the direction perpendicular to the flat surface of the arm portion 221. At this time, in each fixing portion 22, the first protrusion 222a and the second protrusion 222b may be bent in the opposite direction. Thereby, compared with the case where the circuit board 30 is fixed only to the area | region near the rotating shaft J1, generation | occurrence | production of the vibration in the circuit board 30 and curvature of a circuit board can be suppressed.

In addition, the circuit board 30 is fixed on the outer circumferential side of the FG coil pattern 32 formed in a round ring shape, thereby generating the vibration of the circuit board 30 in the region where the FG coil pattern 32 is formed. It can be suppressed. Therefore, an accurate FG signal or hall signal can be obtained.

In addition, the first and second protrusions 222a and 222b are simultaneously bent in the fixing portions 22 in a state where no direct force is applied to the circuit board 30, thereby providing the circuit board 30. It is fixed to this attachment plate 20. Accordingly, the number of parts can be reduced and the number of steps can be reduced while fixing the circuit board 30 to the attachment plate 20 using screws. In addition, when fixing the circuit board 30 to the attachment plate 20, it is possible to prevent the circuit board 30 from being damaged such as being broken.

In addition, in this embodiment, although the example in which the 1st protrusion part 222a and the 2nd protrusion part 222b were formed in the fixing part 22 was demonstrated, it is not limited to this. For example, as shown in FIG. 15, a single protrusion 222c may be formed in the fixing portion 22. Also in this case, the circuit board 30 can be fixed to the attachment plate 20 by bending the protrusion part 222c which protruded toward the upper surface side of the circuit board 30. However, when the attachment plate 20 in which the protrusion part 222c was formed for fixing the circuit board 30 is used, the circuit board 30 tends to be overturned more easily than when the attachment plate 20 shown in FIG. 2 and FIG. 3 is used. Lose. For this reason, it is preferable to attach the circuit board 30 using the attachment plate 20 in which the 1st protrusion part 222a and the 2nd protrusion part 222b were formed.

In addition, when using the attachment plate 20 in which the protrusion part 222c was formed, it is preferable that the protrusion part 222c can be bent in the outer peripheral direction of a circuit board. This is because, in all the fixing portions 22, when the protrusion 222c is bent inside the circuit board 30, the circuit board 30 may be turned over or broken.

(Second embodiment)

Hereinafter, a second embodiment of the present invention will be described. The brushless motor 10 according to the present embodiment has a different direction in which the first protrusion 222a and the second protrusion 222b are bent than the brushless motor 10 according to the first embodiment. That is, in this embodiment, the shape of the dotted line area | region shown in FIG. 1 differs. Hereinafter, the brushless motor 10 which concerns on a present Example is demonstrated in detail centering on this point.

In addition, each structure of the brushless motor 10, the mounting plate 20, and the circuit board 30 which concerns on a present Example is the brushless motor 10, the mounting plate 20 which concerns on a 1st Example, and a circuit. Since it is the same as each structure of the board | substrate 30, the detailed description is abbreviate | omitted.

(Fixing method of mounting plate)

Hereinafter, the method of fixing the circuit board 30 to the mounting plate 20 in the present embodiment will be described with reference to FIGS. 16 to 18. FIG. 16 is a plan view showing the mounting plate 20 to which the circuit board 30 is fixed in this embodiment. FIG. 17 is a side view of the attachment plate 20 and the circuit board 30 shown in FIG. 16 as viewed from the arrow A direction. FIG. 18 is a partially enlarged view of the mounting plate 20 and the circuit board 30 in the region R6 shown in FIG. 17. 16, the display of the FG coil pattern 32 etc. which are formed in the circuit board 30 is abbreviate | omitted.

The alignment of the mounting plate 20 and the circuit board 30 is the same as in the first embodiment. However, in this embodiment, as shown in FIG. 16 and FIG. 17, the 1st protrusion part 222a and the 2nd protrusion part 222b are each bent in the direction parallel to the flat surface of the arm part 221. As shown in FIG.

The protrusion 222b is in contact with the top surface of the circuit board 30, and the support part 223 is in contact with the bottom surface of the circuit board 30.

As a result, the movement of the circuit board 30 in the vertical direction is regulated. In addition, by bending the first protrusion 222a and the second protrusion 222b in the opposite direction, the movement of the circuit board 30 in the direction perpendicular to the rotation axis J1 is regulated. In each fixing part 22, the circuit board 30 is fixed to the attachment plate 20 by bending the 1st protrusion part 222a and the 2nd protrusion part 222b as shown in FIG.

(Bending process of the protrusion)

Hereinafter, the bending process of the 1st protrusion part 222a and the 2nd protrusion part 222b in a present Example is demonstrated concretely using FIG. 19 and FIG.

FIG. 19 is a diagram showing a state in which the supporting jig 42 and the pressing jig 43 are disposed with respect to the fixing portion 22 in the region R3 shown in FIG. 8. FIG. 20 is a view showing a state in which the supporting jig 42 and the pressing jig 43 are disposed with respect to the fixing portion 22 in the region R4 shown in FIG. 8. 20, the display of the motor mounting part 23 is abbreviate | omitted.

The pressing jig 43 presses the first protrusion 222a and the second protrusion 222b from above. As shown in FIG. 19, the pressurizing jig 43 is V shape of the bottom part. 19 and 20, grooves 431a and 43lb which are symmetrical with respect to the center line C3 are formed on the bottom of the pressing jig 43. The grooves 431a and 43lb respectively regulate the bending directions of the first protrusion 222a and the second protrusion 222b. In addition, since the supporting jig 42 is already demonstrated in 1st Example, the description is abbreviate | omitted.

Next, the bending process of the 1st protrusion part 222a and the 2nd protrusion part 222b in a present Example is demonstrated. First, the supporting jig 42 is inserted into the opening hole 24 formed in the attachment plate 20, and the pressing jig 43 is disposed above the circuit board 30. As shown in FIGS. 19 and 20, the pressing jig 43 has a center line C3 located between the first protrusion 222a and the second protrusion 222b, and the center line C4 is the first. It is arranged to coincide with the protrusion 222a and the second protrusion 222b.

From the state shown to FIG. 19 and FIG. 20, the pressing jig 43 is gradually moved below. The 1st protrusion part 222a and the 2nd protrusion part 222b are extended in the direction parallel to the flat surface of the arm part 221 by the pressing jig 43. That is, the first protrusion 222a is bent in the right direction in FIG. 19 by contacting the inner wall of the groove 431a, and the second protrusion 222b is in contact with the inner wall of the groove 43l b, so that the left side of FIG. Bent in the direction. At this time, since the pressing jig 43 does not contact the circuit board 30, the force from above is not directly applied to the circuit board 30.

When the pressing jig 43 contacts the first projecting portion 222a and the second projecting portion 222b, the upper surface of the supporting jig 42 is in contact with the exposed surface 241 of the opening hole 24. That is, the support jig 42 supports the attachment plate 20 from the lower side when bending the 1st protrusion part 222a and the 2nd protrusion part 222b. Therefore, the force from below is not directly applied to the circuit board 30 either.

In the present embodiment, the force applied to the first protrusion 222a and the second protrusion 222b is smaller than the bending process in the first embodiment. This is because in the present embodiment, the first protrusion 222a and the second protrusion 222b do not need to be bent and bent as in the first embodiment. Therefore, in the bending process of this embodiment, the load on the circuit board 30 can be made small, and generation | occurrence | production of distortion, a crack, etc. of the circuit board 30 can be suppressed more effectively.

In addition, the bending process of this embodiment is performed simultaneously with respect to all the fixing parts 22. As a result, the number of parts and the number of steps required for fixing the circuit board 30 can be reduced. In addition, damage to the circuit board 30 such as cracking can be prevented from occurring.

As described above, in the present embodiment, the circuit board 30 has the first protrusion 222a and the second protrusion 222b inserted into the through hole 33 in a direction parallel to the arm portion 221. It is fixed by bending. As a result, the circuit board 30 can be fixed at a place other than the region near the rotation shaft J1, and the occurrence of vibration in the circuit board 30 and the warpage of the circuit board 30 can be suppressed. .

In addition, as in the first embodiment, since the through hole 33 is formed outside the FG coil pattern 32, it is possible to suppress the occurrence of vibration in the peripheral portion of the circuit board 30. As a result, the brushless motor 10 according to the present embodiment can accurately acquire the FG signal or the hall signal.

In this embodiment, the force applied to the first protrusion 222a and the second protrusion 222b at the time of bending can be made smaller than that of the first embodiment. For this reason, the damage or curvature of the circuit board 30 can be suppressed more effectively.

In the first and second embodiments, an example in which the first protrusion 222a and the second protrusion 222b are bent until contact with the upper surface of the circuit board 30 has been described. It doesn't work. For example, in the bending process, the first protrusion 222a and the second protrusion 222b may be dug into the inner circumferential surface of the through hole 33. Thereby, the circuit board 30 can be fixed to the attachment plate 20 reliably. In this case, however, the circuit board 30 may be damaged or warped. For this reason, what is necessary is just to control the force applied to the 1st protrusion part 222a and the 2nd protrusion part 222b according to the strength of the circuit board 30, the position where the through-hole 33 is formed, etc.

In addition, in the said 1st and 2nd Example, although the through-hole 33 of the circuit board 30 demonstrated the example formed in the radially outer side of the FG coil pattern 32 formed in round ring shape, this was demonstrated. It is not limited to. For example, when the FG coil pattern 32 is not formed in the circuit board 30, the through hole 33 of the circuit board 30 may be formed outside the radial direction of the rotor 12. Thereby, in order to suppress the bending or the vibration of the circuit board 30 in the area | region where a hall element is arrange | positioned, it becomes possible to acquire an accurate hall signal.

In the first and second embodiments, an example has been described in which the through hole 33 formed in the circuit board 30 is formed outside the FG coil pattern 32. However, it is preferable to sufficiently secure the distance between the through hole 33 and the periphery of the circuit board 30. This is caused by the force applied indirectly to the circuit board 30 when the distance between the through hole 33 and the periphery of the circuit board 30 is not sufficiently secured during the bending process. This is because damage such as cracking is likely to occur.

1 is a side cross-sectional view of a brushless motor according to an embodiment of the present invention;

2 is a plan view of the mounting plate according to an embodiment of the present invention,

3 is a side view of the mounting plate according to the embodiment of the present invention;

4 is a partially enlarged view of the mounting plate shown in FIG. 3;

5 is a partially enlarged view of the mounting plate shown in FIG. 3;

6 is a plan view of a circuit board according to an embodiment of the present invention;

7 is a plan view of the mounting plate and the circuit board when the circuit board is mounted on the mounting plate;

8 is a side view of the mounting plate and the circuit board when the circuit board is mounted on the mounting plate;

9 is a plan view of the mounting plate and the circuit board when the circuit board is fixed to the mounting plate in the first embodiment;

10 is a side view of the mounting plate and the circuit board when the circuit board is fixed to the mounting plate in the first embodiment;

FIG. 11 is a partially enlarged view of the mounting plate and the circuit board shown in FIG. 10; FIG.

12 is a diagram showing an arrangement of jigs according to the first embodiment;

13 is a diagram showing an arrangement of jigs according to the first embodiment;

14 is a view showing the shape of a deformation plate constituting the pressing jig according to the first embodiment;

15 is a diagram showing a modification of the fixing part according to the first embodiment;

16 is a plan view of the mounting plate and the circuit board when the circuit board is fixed to the mounting plate in the second embodiment;

17 is a side view of the attachment plate and the circuit board when the circuit board is fixed to the attachment plate in the second embodiment;

18 is a partially enlarged view of the mounting plate and the circuit board shown in FIG. 17;

19 is a diagram showing the arrangement of jigs according to the second embodiment;

20 is a diagram showing an arrangement of jigs according to the second embodiment.

(Description of the main parts of the drawing)

10: brushless motor

11: shaft

12: rotor

14: Stator Core

15: coil

20: attachment plate

21: substrate

22: fixed part

23: motor attachment part

24: opening hole

30: circuit board

32: FG coil pattern

33: through hole

41, 43: Pressing jig

42: support jig

221 arm part

222a: first protrusion

222b: second protrusion

222c: protrusion

223 support part

241: exposed surface

Claims (12)

In brushless motors, A motor driving unit including a rotor rotating about a rotation axis; A circuit board for driving the motor drive unit, the circuit board having a plurality of through holes penetrating the upper and lower surfaces thereof; And a motor mounting plate provided in correspondence with each through hole and having a plate-shaped fixing portion integrally fixed to each of the through holes, the plate-like substrate portion being disposed in parallel with the circuit board. Each fixing part is a support part which contacts the surface of the said motor mounting plate side of the said circuit board, and supports the said circuit board, the flat-shaped arm part extended from the said support part, and bending in the direction of the rotation axis, and the arm part extending from the arm part. A projection portion inserted into each through hole from a surface of the circuit board side of the circuit board and protruding from each through hole; The projecting portion is characterized in that the portion projecting from each of the through holes is bent in a direction perpendicular to the direction of the rotation axis. Brushless motor. The method of claim 1, The protrusion includes a first protrusion bent in a predetermined direction perpendicular to the rotation axis direction, and a second protrusion bent in a direction opposite to the predetermined direction. Brushless motor. The method of claim 2, The predetermined direction is a direction perpendicular to the flat surface of the arm portion, characterized in that Brushless motor. The method of claim 2, The predetermined direction is a direction parallel to the flat surface of the arm portion, characterized in that Brushless motor. The method according to any one of claims 2 to 4, The first protrusion and the second protrusion are formed along a flat surface of the arm portion in a state before bending. Brushless motor. The method of claim 5, The first protrusion and the second protrusion are formed in parallel with the direction in which the respective through holes are formed in a state before bending. Brushless motor. The method of claim 1, The protrusion is characterized in that the hook shape Brushless motor. The method according to any one of claims 1 to 4, Each through hole is formed in the radially outer side of the said rotor, It is characterized by the above-mentioned. Brushless motor. The method according to any one of claims 1 to 4, A coil pattern for detecting the rotational speed of the rotor is formed on the circuit board, and each through hole is formed outside the radial direction of the coil pattern. Brushless motor. The method according to any one of claims 1 to 4, In the motor mounting plate, opening holes penetrating the motor mounting plate are formed at the boundary portions of the fixing portions and the substrate portions, respectively. The inner circumferential surface of each of the opening holes each includes a first surface, The first surface is exposed to a space on the side opposite to the side on which the circuit board is mounted. Brushless motor. The method of claim 10, The first surface is disposed in parallel with the circuit board, Brushless motor. The method of claim 10, The first surface is supported by a jig, characterized in that the protrusion is bent Brushless motor.

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