JP6922537B2 - Brushless motor - Google Patents

Description

The present invention relates to a brushless motor.

Patent Document 1 discloses a brushless motor including a sensor pin that guides magnetism generated from a rotor magnet to a hall sensor. In this brushless motor, the sensor pin is held by a connector cover provided in a resin connector housing. Further, the connector housing includes a plurality of terminals for electrically connecting the external device and the circuit board. The connector cover that holds the sensor pin is arranged on one side of the plate-shaped pedestal, and the circuit board having the Hall sensor is arranged on the other side of the pedestal. The sensor pin is inserted into the opening formed in the pedestal and is arranged to face the hall sensor.

Japanese Unexamined Patent Publication No. 2017-4970

In the brushless motor described in Patent Document 1, it is necessary to increase the molding accuracy of the resin connector housing in order to accurately arrange the sensor pins on the Hall sensor while connecting a plurality of terminals to the circuit board. However, if the molding accuracy of the resin connector housing cannot be ensured, there is a possibility that the sensor pin (magnetic induction member) cannot be accurately opposed to the Hall sensor (magnetic detection sensor).

The present invention has been made in view of the above problems, and an object of the present invention is to provide a brushless motor capable of accurately arranging a magnetic induction member facing a magnetic detection sensor.

In order to solve the above problems, the brushless motor according to claim 1 has an annular stator having a plurality of teeth extending radially, windings wound around the plurality of teeth, and a diameter of the stator. A rotor having a rotor magnet arranged so as to face the stator on the outside in the direction and forming a motor element together with the stator, a support member for supporting the motor element, and a circuit board on which a magnetic detection sensor is mounted. A magnetic induction member extending from the rotor magnet side to the magnetic detection sensor side and guiding magnetism generated from the rotor magnet to the magnetic detection sensor, a plurality of terminals connecting the circuit board and the winding, and the above. A first holding member that holds the circuit board and is supported by the support member, and a first holding member that is separate from the first holding member and that holds the magnetic induction member and is supported by the support member. (Ii) A holding member, and as the magnetic guiding member, three magnetic guiding members including a first magnetic guiding member, a second magnetic guiding member, and a third magnetic guiding member are provided and formed on the rotor magnet. The relationship between the number of the plurality of magnetic poles and the number of the plurality of slots formed between the plurality of teeth in the stator is 10 poles 12 slots or 14 poles 12 slots, and the first magnetic induction The member is arranged on a line that bisects the opening angle of one of the plurality of slots, and the second magnetic induction member is of one of the plurality of teeth adjacent to the one slot. It is arranged on one side with respect to the central axis, and the third magnetic induction member is arranged on the other side with respect to the central axis of the one tooth.

According to this brushless motor, the first holding member that holds a plurality of terminals and the second holding member that holds the magnetic induction member are separately configured from each other. Therefore, for example, since the second holding member can be miniaturized as compared with the case where the first holding member and the second holding member are composed of one holding member, the second holding member can be manufactured by molding. In this case, the molding accuracy of the second holding member can be ensured. Moreover, since the second holding member that holds the magnetic induction member is separate from the first holding member that holds the plurality of terminals, it is possible to avoid the influence of the plurality of terminals on the arrangement of the second holding member. From the above, the magnetic induction member can be accurately arranged to face the magnetic detection sensor, and the first magnetic induction member is arranged on a line that bisects the opening angle of one of the plurality of slots. The magnetic guiding member is arranged on one side of the central axis of one tooth adjacent to one slot of the plurality of teeth, and the third magnetic guiding member is arranged on the other side of the central axis of one tooth. .. Therefore, since the first magnetic guiding member, the second magnetic guiding member, and the third magnetic guiding member are collectively arranged at positions close to each other, the second holding member for holding the plurality of magnetic guiding members is miniaturized. can do.

The brushless motor according to claim 2 is the brushless motor according to claim 1, wherein the support member has a plate-shaped portion having a plate thickness direction in the axial direction of the motor element, and the magnetic induction member comprises a plate-like portion. The motor element is inserted into a through hole formed in the plate-shaped portion, the motor element is arranged on one surface side of the plate-shaped portion, and the second holding member is within the range of the plate-shaped portion when viewed from the axial direction. It is arranged inside and on one surface side of the plate-shaped portion in a state of being in surface contact with the plate-shaped portion, and the circuit board and the first holding member are arranged on the other surface side of the plate-shaped portion. be.

As described above, when a through hole is formed in the plate-shaped portion, for example, when the motor element is exposed to water, water may infiltrate from one side to the other side of the plate-shaped portion through the through hole. There is. However, according to this brushless motor, the second holding member is arranged on one surface side of the plate-shaped portion, and the circuit board and the first holding member are arranged on the other surface side of the plate-shaped portion. Therefore, in order to prevent the ingress of water, it is sufficient to seal between the peripheral edge portion and the plate-shaped portion of the second holding member. Thereby, for example, the first holding member and the second holding member are composed of one holding member, and the sealing range is compared with the case where the peripheral portion and the plate-shaped portion of the holding member are sealed. Can be small. As a result, the ingress of water can be prevented more effectively, and the amount of the sealing material used can be reduced, so that the cost can be reduced.

The brushless motor according to claim 3 has an annular stator having a plurality of radially extending teeth and windings wound around the plurality of teeth, and faces the stator outward in the radial direction of the stator. It has a rotor magnet which is arranged with the rotor magnet, and has a rotor which constitutes a motor element together with the stator, and a plate-shaped portion whose axial direction of the motor element is a plate thickness direction, and the motor element is one of the plate-shaped portions. A support member supported on the direction side, a circuit board on which a magnetic detection sensor is mounted, a plurality of terminals connecting the circuit board and the winding, and the circuit board are held, and other than the plate-shaped portion. The first holding member supported by the support member in a state of being arranged on the direction side, and the magnetism extending from the rotor magnet side to the magnetic detection sensor side and guiding the magnetism generated from the rotor magnet to the magnetic detection sensor. The plate-shaped portion is formed separately from the guiding member and the first holding member, and holds the magnetic guiding member inserted into the through hole formed in the plate-shaped portion, and is viewed from the axial direction. It is provided with a second holding member which is arranged within the range of the above and on one surface side of the plate-shaped portion and is supported by the support member in a state where the plate-shaped portion is in surface contact with the plate-shaped portion.

According to this brushless motor, the first holding member that holds a plurality of terminals and the second holding member that holds the magnetic induction member are separately configured from each other. Therefore, for example, since the second holding member can be miniaturized as compared with the case where the first holding member and the second holding member are composed of one holding member, the second holding member can be manufactured by molding. In this case, the molding accuracy of the second holding member can be ensured. Moreover, since the second holding member that holds the magnetic induction member is separate from the first holding member that holds the plurality of terminals, it is possible to avoid the influence of the plurality of terminals on the arrangement of the second holding member. From the above, the magnetic induction member can be accurately placed facing the magnetic detection sensor. Further, when a through hole is formed in the plate-shaped portion, for example, when the motor element is exposed to water, water may infiltrate from one surface side to the other surface side of the plate-shaped portion through the through hole. However, according to this brushless motor, the second holding member is arranged on one surface side of the plate-shaped portion, and the circuit board and the first holding member are arranged on the other surface side of the plate-shaped portion. Therefore, in order to prevent the ingress of water, it is sufficient to seal between the peripheral edge portion and the plate-shaped portion of the second holding member. Thereby, for example, the first holding member and the second holding member are composed of one holding member, and the sealing range is compared with the case where the peripheral portion and the plate-shaped portion of the holding member are sealed. Can be small. As a result, the ingress of water can be prevented more effectively, and the amount of the sealing material used can be reduced, so that the cost can be reduced.

The brushless motor according to claim 4 is the brushless motor according to claim 2 or 3, wherein the peripheral portion of the second holding member and the plate-shaped portion are sealed.

According to this brushless motor, the peripheral portion and the plate-shaped portion of the second holding member are sealed. Therefore, it is possible to prevent water from entering from one surface side to the other surface side of the plate-shaped portion through the through hole formed in the plate-shaped portion. As a result, it is possible to prevent the circuit board arranged on the other side of the plate-shaped portion from being exposed to water.

The brushless motor according to claim 5 is the brushless motor according to any one of claims 2 to 4, wherein the magnetic induction member has a protruding portion protruding to one surface side of the plate-shaped portion. The second holding member has a bulging portion that bulges on one surface side of the plate-shaped portion and covers the protruding portion.

According to this brushless motor, the protruding portion of the magnetic induction member is covered by the protruding portion of the second holding member. Therefore, for example, when assembling a brushless motor, it is possible to prevent the motor element or the like from interfering with the magnetic guiding member (protruding portion) and applying an impact to the magnetic guiding member, and even when the motor element is exposed to water, for example. Corrosion of the magnetic induction member can be suppressed.

The brushless motor according to claim 6 is the brushless motor according to any one of claims 2 to 5, wherein the first holding member cooperates with the plate-shaped portion to accommodate the circuit board. It has a cover portion to be used.

According to this brushless motor, the first holding member has a cover portion for accommodating the circuit board in cooperation with the plate-shaped portion. Therefore, for example, the number of parts can be reduced as compared with the case where the holding portion for holding a plurality of terminals and the cover portion for accommodating the circuit board in cooperation with the plate-shaped portion are separately configured. Because it can be done, the cost can be reduced.

The brushless motor according to claim 7 is the brushless motor according to claim 6, wherein the first holding member has a connector portion that surrounds a plurality of connector terminals electrically connected to the circuit board. The cover portion and the connector portion are integrally formed.

According to this brushless motor, the cover portion and the connector portion are integrally formed. Therefore, for example, the number of parts can be reduced as compared with the case where the cover portion and the connector portion are separately configured, so that the cost can be reduced.

The brushless motor according to claim 8 is the brushless motor according to any one of claims 2 to 7, wherein the plate-shaped portion is formed of a magnetic material and the second holding member is non-magnetic. It is made of material.

According to this brushless motor, the plate-shaped portion is made of a magnetic material, but the second holding member is made of a non-magnetic material. Therefore, when the magnetism generated from the rotor magnet is guided to the magnetic detection sensor, it is possible to prevent the magnetism (magnetic flux) from passing through the second holding member. As a result, the magnetic detection accuracy of the magnetic detection sensor can be improved.

The brushless motor according to claim 9 is the brushless motor according to claim 8, wherein the plate-shaped portion is an iron pressed part.

According to this brushless motor, the plate-shaped portion is an iron pressed part. Therefore, for example, the manufacturing cost of the plate-shaped portion can be reduced as compared with the case where the plate-shaped portion is a die-cast part made of aluminum.

The brushless motor according to claim 10 is the brushless motor according to any one of claims 2 to 9, wherein a fitting portion is formed in the plate-shaped portion, and the second holding member is formed with the fitting portion. A fitted portion fitted with the fitting portion is formed with the plate thickness direction of the plate-shaped portion as the insertion direction.

According to this brushless motor, the fitting portion formed in the plate-shaped portion and the fitted portion formed in the second holding member are fitted with the plate thickness direction of the plate-shaped portion as the insertion direction. Therefore, in the state where the fitting portion and the fitted portion are fitted, the second holding member is positioned in the direction orthogonal to the plate thickness direction of the plate-shaped portion with respect to the plate-shaped portion. As a result, the magnetic induction member held by the second holding member can be arranged facing each other with higher accuracy by the magnetic detection sensor.

The brushless motor according to claim 11 is the brushless motor according to claim 10, wherein the fitting portion includes a concave recess recessed in the plate thickness direction of the plate-shaped portion, and the fitted portion is the said. It includes the main body of the second holding member housed in the recess.

According to this brushless motor, the main body of the second holding member is housed in a recess formed in the support member. Therefore, since the main body portion is housed in the recess, it is possible to suppress the protrusion of the second holding member to one surface side of the plate-shaped portion. As a result, a gap between the plate-shaped portion and the rotor can be secured. Therefore, for example, when this gap is used as the cooling airflow passage, the cross-sectional area of the cooling airflow passage can be secured.

The brushless motor according to claim 12 is the brushless motor according to claim 11, wherein the magnetic induction member extends in the plate thickness direction of the plate-shaped portion, and the recess is in the plate thickness direction of the plate-shaped portion. It has a bottom surface that is orthogonal to each other, and the main body portion has a contact surface that is orthogonal to the plate thickness direction of the plate-shaped portion and is in surface contact with the bottom surface.

According to this brushless motor, the contact surface formed on the second holding member is in contact with the bottom surface of the recess formed in the plate-shaped portion, and both the bottom surface and the contact surface are plates of the plate-shaped portion. It is orthogonal to the thickness direction. Therefore, since the verticality of the magnetic guiding member held by the second holding member with respect to the plate-shaped portion can be ensured, the magnetic guiding members can be arranged facing each other more accurately by the magnetic detection sensor.

The brushless motor according to claim 13 is the brushless motor according to any one of claims 1 to 12, wherein the connection portion between the plurality of terminals and the terminal portion of the winding is the motor element. It is arranged outside the range of a central angle of 180 degrees including the magnetic induction member with the central portion as the center.

According to this brushless motor, the connection portion between the plurality of terminals and the terminal portion of the winding is arranged outside the range of a central angle of 180 degrees including the magnetic guiding member with the central portion of the motor element as the center. Therefore, it is possible to suppress the influence of the magnetic field generated at the connection portion between the plurality of terminals and the terminal portion of the winding on the magnetic induction member. As a result, the magnetism generated from the rotor magnet can be accurately detected by the magnetic detection sensor.

It is a vertical sectional view of the brushless motor which concerns on one Embodiment of this invention. It is an exploded perspective view of the P part of FIG. It is a perspective view of the P part of FIG. It is a vertical cross-sectional view of the P part of FIG. It is a top view which shows the positional relationship between the stator of FIG. 1 and three magnetic induction members. It is a top view which shows the 1st example of the range of the central angle 180 degrees including the magnetic induction member of FIG. It is a top view which shows the 2nd example of the range of the central angle 180 degrees including the magnetic induction member of FIG. It is a top view which shows the 3rd example of the range of the central angle 180 degrees including the magnetic induction member of FIG. It is a vertical cross-sectional view which shows the modification of the P part of FIG.

Hereinafter, the brushless motor 10 according to the embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the brushless motor 10 according to the embodiment of the present invention includes a stator 12, a rotor 14, a shaft 16, a centerpiece 18, a circuit board 20, a magnetic induction member 22, and a connector. It includes a housing 24 and a cover member 26. In each figure, the arrow A1 indicates one side of the brushless motor 10 in the axial direction, and the arrow A2 indicates the other side of the brushless motor 10 in the axial direction.

The stator 12 is formed in an annular shape as a whole, and is arranged coaxially with the shaft 16. The stator 12 has a stator core 28 and a plurality of windings 30. A plurality of teeth 32 extending radially around the shaft 16 are formed in the stator core 28, and a slot 34 having a substantially V shape in the axial direction of the stator 12 is formed between the plurality of teeth 32 (see FIG. 5). ) Is formed. The winding 30 is wound around each tooth 32 a plurality of times via an insulator.

The rotor 14 constitutes the motor element 36 together with the stator 12. The rotor 14 has a rotor housing 38 and a rotor magnet 40. The rotor housing 38 is formed in a celestial cylindrical shape, and a tubular bearing accommodating portion 42 is formed in the central portion of the top wall portion of the rotor housing 38. A pair of bearings 44 arranged concentrically with the shaft 16 are housed in the bearing accommodating portion 42, and the rotor 14 is rotatably supported by the shaft 16 via the pair of bearings 44.

The rotor magnet 40 is fixed to the inner peripheral surface of the peripheral wall portion of the rotor housing 38. The rotor housing 38 is provided in an annular shape along the circumferential direction of the rotor 14, and has a configuration in which N poles and S poles are alternately provided in the circumferential direction of the rotor 14. The brushless motor 10 is of a so-called outer rotor type, and the rotor magnet 40 is arranged on the outer side in the radial direction of the stator 12 so as to face the stator 12.

The brushless motor 10 of the present embodiment is preferably used as, for example, a fan motor. When the brushless motor 10 is used as a fan motor, a fan (not shown) is fixed to the rotor 14. A ventilation hole 46 is formed in the top wall portion of the rotor housing 38, and when the fan rotates together with the rotor 14, as indicated by an arrow W, the plate-shaped portion 48 described later from the radial outside of the rotor housing 38 Cooling air flows in between the rotor housings 38, and the cooling air passes between the teeth 32 of the stator 12 to cool the stator 12 and the like, and then is discharged from the ventilation holes 46.

The centerpiece 18 is an example of a “support member”. The center piece 18 has a plate-shaped portion 48 and a support portion 50 (color). The plate-shaped portion 48 and the support portion 50 are formed as separate bodies. The plate-shaped portion 48 is formed in a plate shape, and is arranged with the axial direction of the motor element 36 as the plate thickness direction. The arrow A1 corresponds to one side of the plate-shaped portion 48, and the arrow A2 corresponds to the other side of the plate-shaped portion 48.

A positioning portion 52 is formed coaxially with the shaft 16 at the center of the plate-shaped portion 48. The positioning portion 52 is formed in a concave shape that opens on the motor element 36 side, for example. The positioning unit 52 is used when positioning the cover member 26 that holds the magnetic induction member 22, which will be described later. In this positioning operation, the cover member 26 is positioned with reference to the positioning portion 52 by the jig, and the magnetic induction member 22 is positioned with respect to the central axis of the motor element 36.

The support portion 50 is formed in a substantially cylindrical shape (approximately cylindrical shape) whose axial direction coincides with that of the motor element 36, and is arranged at the central portion on one side of the plate-shaped portion 48. The support portion 50 is fixed to the plate-shaped portion 48 by, for example, screwing. The centerpiece 18 including the plate-shaped portion 48 and the support portion 50 is formed of, for example, a magnetic material that is generally cheaper than a non-magnetic material. Further, the plate-shaped portion 48 is, for example, an iron pressed part. A through hole 54 penetrating the plate-shaped portion 48 in the plate thickness direction is formed at a position of the plate-shaped portion 48 facing the magnetic detection sensor 58 described later.

A support hole 56 extending along the axial direction of the support portion 50 is formed in the central portion of the support portion 50, and the shaft 16 is press-fitted into the support hole 56 to support the support portion 50. Further, the support portion 50 is press-fitted inside the stator core 28 formed in an annular shape, whereby the entire stator 12 including the stator core 28 is supported by the support portion 50. As described above, the motor element 36 including the stator 12, the rotor 14, and the shaft 16 is supported by the center piece 18 including the support portion 50 and the plate-shaped portion 48. The motor element 36 is arranged on one side (arrow A1 side) of the plate-shaped portion 48, similarly to the support portion 50.

The circuit board 20 is for controlling the stator 12, and is arranged on the side opposite to the motor element 36 with respect to the plate-shaped portion 48, that is, on the other surface side (arrow A2 side) of the plate-shaped portion 48. The circuit board 20 is provided along the plate-shaped portion 48, and is arranged so as to face the plate-shaped portion 48 in the plate thickness direction. The circuit board 20 has a gap between the circuit board 20 and the plate-shaped portion 48, and the magnetic detection sensor 58 is mounted on the surface of the circuit board 20 on the plate-shaped portion 48 side. For example, a Hall IC is applied to the magnetic detection sensor 58.

The magnetic induction member 22 is formed in a straight rod shape, and is arranged with the plate thickness direction of the plate-shaped portion 48 as the axial direction. The magnetic induction member 22 is inserted into a through hole 54 formed in the plate-shaped portion 48, and extends from the rotor magnet 40 side to the magnetic detection sensor 58 side. The magnetic induction member 22 is made of, for example, a magnetic material such as iron, and has a function of inducing the magnetism generated from the rotor magnet 40 to the magnetic detection sensor 58.

The magnetic guiding member 22 penetrates the plate-shaped portion 48 by being inserted through the through hole 54. More specifically, the magnetic induction member 22 has a first projecting portion 60 projecting to one surface side of the plate-shaped portion 48, and a second projecting portion 62 projecting to the other surface side of the plate-shaped portion 48. The first protruding portion 60 is an example of a “protruding portion”, and is arranged inside the end portion of the rotor magnet 40 on the plate-shaped portion 48 side in the radial direction and is in close proximity to the end portion. The second protruding portion 62 is arranged so as to face the magnetic detection sensor 58.

Although the magnetic induction member 22 and the magnetic detection sensor 58 are shown one by one in FIG. 1, the brushless motor 10 includes a plurality of magnetic induction members 22 and a plurality of magnetic detection sensors 58 (for example, three). It is provided.

The connector housing 24 is an example of a “first holding member”. The connector housing 24 is arranged on the other side (arrow A2 side) of the plate-shaped portion 48, similarly to the circuit board 20. The connector housing 24 is supported by the plate-shaped portion 48 by being assembled to the plate-shaped portion 48 from the other side of the plate-shaped portion 48. The connector housing 24 is made of resin as an example, and has a cover portion 64 and a connector portion 66. The cover portion 64 and the connector portion 66 are integrally formed.

The cover portion 64 is formed in a substantially flat container shape that opens toward the plate-shaped portion 48. The cover portion 64 forms a space 68 with the plate-shaped portion 48, and the circuit board 20 is housed in this space 68. In this way, the cover portion 64 accommodates the circuit board 20 in cooperation with the plate-shaped portion 48.

A plurality of boss portions 72 protruding toward the plate-shaped portion 48 are formed on the portion 70 of the cover portion 64 facing the plate-shaped portion 48, and the circuit board 20 is screwed on the plurality of boss portions 72. It is fixed by a stopper or the like. The circuit board 20 is held in the connector housing 24 (cover portion 64) by being fixed to the plurality of boss portions 72. Further, a winding terminal 76, which is an example of a "terminal", penetrates the side wall portion 74 of the cover portion 64. The winding terminal 76 is held by the connector housing 24 (cover portion 64) by being fixed to the side wall portion 74.

One end 76A of the winding terminal 76 is connected to the circuit board 20 inside the cover 64, and the other end 76B of the winding terminal 76 projects from the side wall 74 to the side of the cover 64. .. The terminal portion 30A of the winding 30 extends along the axial direction of the motor element 36 (the plate thickness direction of the plate-shaped portion 48) and is inserted into the connecting hole 78 formed in the plate-shaped portion 48. The terminal portion 30A of the winding 30 is connected to the other end portion 76B of the winding terminal 76 by, for example, fusing. The connection portion 80 is a portion where the terminal portion 30A of the winding 30 and the winding terminal 76 are connected.

In FIG. 1, the terminal portion 30A and the winding terminal 76 of the winding 30 are shown one by one, but the brushless motor 10 has a plurality of terminal portions 30A and the winding terminal 76 of the winding 30. It is provided one by one. In the present embodiment, as an example, the winding terminal 30A has six terminal portions 30A, and the winding terminal 76 has three winding terminals 76. Further, the terminal portions 30A of the winding 30 are connected to the winding terminal 76 by two, so that the connecting portions 80 are provided at three places.

The connector portion 66 is provided on the side of the connector housing 24 opposite to the side where the connection portion 80 is provided. The connector portion 66 is open on the opposite side of the connection portion 80. On the cover portion 64 side of the connector portion 66, a partition wall portion 82 for partitioning the inside of the connector portion 66 and the inside of the cover portion 64 is formed, and the connector terminal 84 penetrates through the partition wall portion 82. .. The connector terminal 84 is held in the connector housing 24 (connector portion 66) by being fixed to the partition wall portion 82.

One end 84A of the connector terminal 84 is connected to the circuit board 20 inside the cover portion 64, and the other end of the connector terminal 84 is formed as a connector terminal 86 electrically connected to the circuit board 20. There is. The connector terminal 86 projects from the partition wall portion 82 to the inside of the connector portion 66, and is surrounded by the connector portion 66.

The cover member 26 is an example of a “second holding member”. The cover member 26 is arranged on one surface side (arrow A1 side) of the plate-shaped portion 48, similarly to the motor element 36. The cover member 26 is preferably made of a non-magnetic material. In the present embodiment, as an example, the cover member 26 is made of a resin which is a non-magnetic material. The cover member 26 is configured separately from the connector housing 24.

As shown in FIG. 2, the cover member 26 includes a plate-shaped main body portion 88, a plurality of bulging portions 90 bulging toward one surface side (arrow A1 side) of the main body portion 88, and other than the main body portion 88. It has a plurality of protrusions 92 protruding toward the direction side (arrow A2 side). The main body portion 88 is arranged so that the plate-shaped portions 48 and the plate-shaped portions 48 coincide with each other in the plate thickness direction, and is formed in a substantially arc shape along the circumferential direction of the motor element 36 (see FIG. 1). The plurality of bulging portions 90 are each formed in a hollow quadrangular pyramid shape, and the plurality of protruding portions 92 are provided at both ends and a central portion of the main body portion 88, respectively.

Inside the plurality of bulging portions 90, the first protruding portions 60 of the plurality of magnetic guiding members 22 are respectively housed, whereby the first protruding portions 60 of the plurality of magnetic guiding members 22 are accommodated in the plurality of bulging portions. Each is covered by 90 (see also FIG. 4). The cover member 26 may be independently manufactured by resin molding and then assembled with a plurality of magnetic induction members 22, or may be integrated with a plurality of magnetic induction members 22 by insert molding. The cover member 26 has a function as a lid material that covers the plurality of magnetic induction members 22 and closes the through holes 54, and a function as a holding member that holds the plurality of magnetic induction members 22.

Hereinafter, when a plurality of magnetic induction members 22 are identified, the plurality of magnetic induction members 22 are referred to as a first magnetic induction member 22A, a second magnetic induction member 22B, and a third magnetic induction member 22C.

The plate-shaped portion 48 is formed with a fitting portion 94, and the cover member 26 is formed with a fitted portion 96. The fitting portion 94 includes a concave recess 98 recessed in the axial direction of the plate-shaped portion 48, and a plurality of fitting holes 100 penetrating in the plate thickness direction of the plate-shaped portion 48. The plurality of fitting holes 100 are located inside the recess 98.

Further, the above-mentioned through hole 54 (see FIG. 1) through which the plurality of magnetic induction members 22 are inserted is also located inside the recess 98. Two through holes 54 are formed in the plate-shaped portion 48. As will be described in detail later, the second magnetic induction member 22B is unevenly arranged on the side of the third magnetic induction member 22C, and the first magnetic induction member 22A is inserted into one through hole 54 and the other. The second magnetic induction member 22B and the third magnetic induction member 22C are inserted into the through hole 54 of the above.

The fitted portion 96 includes a main body portion 88 and a plurality of protruding portions 92. The main body portion 88 is housed in the recess 98 and is fitted with the recess 98 (see also FIGS. 3 and 4). Further, the plurality of protrusions 92 are inserted into the plurality of fitting holes 100, respectively. In this way, the main body portion 88 and the plurality of protrusions 92 are inserted and fitted into the recess 98 and the plurality of fitting holes 100 with the axial direction of the plate-shaped portion 48 as the insertion direction.

Further, the recess 98 has a bottom surface 98A orthogonal to the plate thickness direction of the plate-shaped portion 48, and the surface of the main body portion 88 facing the bottom surface 98A is a contact surface orthogonal to the plate thickness direction of the plate-shaped portion 48. It is formed as 88A. The contact surface 88A comes into surface contact with the bottom surface 98A in a state where the main body portion 88 is fitted with the recess 98 (see also FIG. 4). When the contact surface 88A comes into surface contact with the bottom surface 98A, the verticality of the plurality of magnetic induction members 22 held by the cover member 26 with respect to the plate-shaped portion 48 is ensured.

Further, as shown in FIG. 4, the portion of the protrusion 92 that protrudes from the fitting hole 100 is caulked. As a result, the protrusion 92 is prevented from coming off from the fitting hole 100, and the cover member 26 is fixed and supported by the plate-shaped portion 48. Further, in a state where the cover member 26 is fixed to the plate-shaped portion 48, the peripheral portion of the cover member 26 (main body portion 88) and the plate-shaped portion 48 are sealed by the sealing member 102.

In the brushless motor 10 (see FIG. 1) having the above configuration, the relationship between the number of the plurality of magnetic poles formed in the rotor magnet 40 and the number of the plurality of slots 34 (see FIG. 5) formed in the stator 12 is There are 10 poles and 12 slots, or 14 poles and 12 slots. In this 10-pole 12-slot or 14-pole 12-slot configuration, the arrangement of the plurality of magnetic induction members 22 has been devised, and specifically, it is as follows.

That is, as shown in FIG. 5, the first magnetic induction member 22A is arranged on the line La that bisects the opening angle of one of the plurality of slots 34, the slot 34A, in the axial direction of the stator 12. There is. On the other hand, the second magnetic induction member 22B is one side with respect to the central axis Lb of one tooth 32A adjacent to one slot 34A of the plurality of teeth 32 in the axial direction of the stator 12 (one side in the circumferential direction of the stator 12). The third magnetic induction member 22C is arranged on the other side (the other side in the circumferential direction of the stator 12) with respect to the central axis Lb of one tooth 32A in the axial direction of the stator 12. The above-mentioned line L1 and the central axis Lb are lines that pass through the central portion of the stator 12 in the axial direction of the stator 12.

Further, as shown in FIG. 6, the arrangement of the plurality of connection portions 80 between the plurality of winding terminals 76 and the terminal portion 30A of the winding 30 is such that the plurality of magnetic guiding members 22 are arranged close to each other. The relationship is as follows. That is, when a range R of a central angle of 180 degrees including a plurality of magnetic induction members 22 is set with the central portion of the motor element 36 as the center, the plurality of connecting portions 80 are outside the range R of the central angle of 180 degrees. Have been placed.

In FIG. 6, as an example, the range of the central angle of 180 ° formed by the boundary line L1 between the plurality of magnetic induction members 22 and the plurality of connecting portions 80 is set as the range R of the central angle of 180 degrees. .. The boundary line L1 is a line that passes through the central portion of the motor element 36 and is orthogonal to the direction in which the plurality of magnetic guiding members 22 and the plurality of connecting portions 80 are arranged in the axial direction of the motor element 36.

If the plurality of connecting portions 80 are arranged outside the range R having a central angle of 180 degrees, the plurality of magnetic guiding members 22 may be arranged at any position in the range R having a central angle of 180 degrees. Further, the plurality of connection portions 80 may be arranged at any position as long as they are arranged outside the range R having a central angle of 180 degrees.

Further, the range R having a central angle of 180 degrees may be set to any range as long as it includes a plurality of magnetic induction members 22. For example, as shown in FIG. 7, the range of the central angle of 180 ° formed by the line L2 in contact with the first magnetic induction member 22A may be set as the range R of the central angle of 180 degrees, and FIG. As shown in, the range of the central angle of 180 ° formed by the line L3 in contact with the third magnetic induction member 22C may be set as the range R of the central angle of 180 degrees.

Here, as shown in FIG. 7, when the range of the central angle of 180 ° formed by the line L2 in contact with the first magnetic induction member 22A is set as the range R of the central angle of 180 degrees, a plurality of connection portions. The 80 is preferably arranged away from the first magnetic guiding member 22A, and is, for example, arranged at a central angle of 90 degrees or more with respect to the first magnetic guiding member 22A. Similarly, as shown in FIG. 8, when the range of the central angle of 180 ° formed by the line L3 in contact with the third magnetic induction member 22C is set as the range R of the central angle of 180 degrees, a plurality of connection portions The 80 is preferably arranged away from the third magnetic guiding member 22C, and is, for example, arranged at a central angle of 90 degrees or more with respect to the third magnetic guiding member 22C.

In the brushless motor 10 (see FIG. 1) having the above configuration, when a rotating magnetic field is formed by the stator 12, a suction repulsive force acts between the stator 12 and the rotor magnet 40, and the rotor 14 rotates. ..

Further, when the magnetic pole of the rotor magnet 40 passes near the plurality of magnetic induction members 22 due to the rotation of the rotor 14, the magnetism from the magnetic poles is guided by the plurality of magnetic induction members 22 to the plurality of magnetic detection sensors 58, respectively. It is detected by the magnetic detection sensor 58. Then, the excitation to each winding 30 is controlled by the control element of the circuit board 20 based on the output signals from the plurality of magnetic detection sensors 58, and the rotation speed and the rotation direction of the rotor 14 are controlled.

Next, the operation and effect of one embodiment of the present invention will be described.

(1) As shown in FIG. 1, according to the brushless motor 10 according to the present embodiment, a connector housing 24 that holds a plurality of winding terminals 76 and a cover member 26 that holds a plurality of magnetic induction members 22. Are configured separately from each other. Therefore, for example, the cover member 26 can be made smaller than the case where the connector housing 24 and the cover member 26 are composed of one holding member. Therefore, when the cover member 26 is manufactured by molding, for example, the cover member 26 can be miniaturized. , The molding accuracy of the cover member 26 can be ensured. Moreover, since the cover member 26 that holds the plurality of magnetic induction members 22 is separate from the connector housing 24 that holds the plurality of winding terminals 76, the plurality of winding terminals 76 affect the arrangement of the cover member 26. Can be avoided. From the above, the plurality of magnetic induction members 22 can be accurately opposed to each magnetic detection sensor 58.

(2) When a through hole 54 is formed in the plate-shaped portion 48, for example, when the motor element 36 is exposed to water, water flows from one side to the other side of the plate-shaped portion 48 through the through hole 54. There is a risk of intrusion. However, according to the brushless motor 10 according to the present embodiment, the cover member 26 is arranged on one side (arrow A1 side) of the plate-shaped portion 48, and the circuit board 20 and the connector housing 24 are formed on the plate-shaped portion 48. It is arranged on the other side (arrow A2 side). Therefore, in order to prevent the ingress of water, it is sufficient to seal between the peripheral edge portion of the cover member 26 and the plate-shaped portion 48. As a result, for example, the connector housing 24 and the cover member 26 are composed of one holding member, and the sealing range is widened as compared with the case where the peripheral portion and the plate-shaped portion 48 of the holding member are sealed. It can be small. As a result, the ingress of water can be prevented more effectively, and the amount of the sealing material used can be reduced, so that the cost can be reduced.

(3) As shown in FIG. 4, the peripheral portion of the cover member 26 and the plate-shaped portion 48 are sealed by the sealing member 102. Therefore, it is possible to prevent water from entering from one side to the other side of the plate-shaped portion 48 through the through hole 54 formed in the plate-shaped portion 48. As a result, it is possible to prevent the circuit board 20 arranged on the other side of the plate-shaped portion 48 from being exposed to water.

(4) The first protruding portion 60 of the magnetic induction member 22 is covered with the bulging portion 90 of the cover member 26. Therefore, for example, it is possible to prevent the motor element 36 and the like from interfering with the magnetic guiding member 22 (first protruding portion 60) and applying an impact to the magnetic guiding member 22 when assembling the brushless motor 10, and for example, the motor element. Even when the 36 is exposed to water, the corrosion of the magnetic induction member 22 can be suppressed.

(5) As shown in FIG. 1, the connector housing 24 has a cover portion 64 that accommodates the circuit board 20 in cooperation with the plate-shaped portion 48. Therefore, for example, as compared with the case where the holding portion for holding the plurality of winding terminals 76 and the cover portion 64 for accommodating the circuit board 20 in cooperation with the plate-shaped portion 48 are separately configured. Since the number of points can be reduced, the cost can be reduced.

(6) In the connector housing 24, the cover portion 64 and the connector portion 66 are integrally formed. Therefore, for example, the number of parts can be reduced as compared with the case where the cover portion 64 and the connector portion 66 are separately configured, so that the cost can be reduced.

(7) The plate-shaped portion 48 is made of a magnetic material, while the cover member 26 is made of a non-magnetic material. Therefore, when the magnetism generated from the rotor magnet 40 is guided to the magnetic detection sensor 58, it is possible to prevent the magnetism (magnetic flux) from passing through the cover member 26. As a result, the magnetic detection accuracy of the magnetic detection sensor 58 can be improved.

(8) The plate-shaped portion 48 is an iron pressed part. Therefore, for example, the manufacturing cost of the plate-shaped portion 48 can be reduced as compared with the case where the plate-shaped portion 48 is a die-cast component made of aluminum.

(9) As shown in FIG. 2, the fitting portion 94 formed in the plate-shaped portion 48 and the fitted portion 96 formed in the cover member 26 are inserted in the plate thickness direction of the plate-shaped portion 48. Fitted as. Therefore, in the state where the fitting portion 94 and the fitted portion 96 are fitted, the cover member 26 is positioned with respect to the plate-shaped portion 48 in a direction orthogonal to the plate thickness direction of the plate-shaped portion 48. As a result, the magnetic induction member 22 held by the cover member 26 can be arranged facing each other with higher accuracy by the magnetic detection sensor 58.

(10) The main body 88 of the cover member 26 is housed in a recess 98 formed in the support member. Therefore, since the main body portion 88 is housed in the recess 98, it is possible to suppress the protrusion of the cover member 26 to one side of the plate-shaped portion 48. As a result, as shown in FIG. 1, a gap between the plate-shaped portion 48 and the rotor 14 can be secured. Therefore, for example, when this gap is used as a cooling air flow passage as in the present embodiment. It is possible to secure the cross-sectional area of the cooling air flow passage.

(11) As shown in FIG. 4, the bottom surface 98A of the recess 98 formed in the plate-shaped portion 48 is in contact with the contact surface 88A formed on the cover member 26, and the bottom surface 98A and the contact surface 88A are in contact with each other. Are all orthogonal to the plate thickness direction of the plate-shaped portion 48. Therefore, since the verticality of the magnetic guiding member 22 held by the cover member 26 with respect to the plate-shaped portion 48 can be ensured, the magnetic guiding member 22 can be arranged more accurately by the magnetic detection sensor 58.

(12) As shown in FIG. 5, the first magnetic induction member 22A is arranged on the line La that bisects the opening angle of one of the plurality of slots 34, the slot 34A, and the second magnetic induction member 22B. Is arranged on one side of the central axis Lb of one tooth 32A adjacent to one slot 34A of the plurality of teeth 32, and the third magnetic induction member 22C is located on the other side of the central axis Lb of one tooth 32A. Have been placed. Therefore, since the first magnetic guiding member 22A, the second magnetic guiding member 22B, and the third magnetic guiding member 22C are collectively arranged at positions close to each other, the cover member 26 for holding the plurality of magnetic guiding members 22 (See FIGS. 2 and 3) can be miniaturized.

(13) As shown in FIGS. 6 to 8, when a range R of a central angle of 180 degrees including a plurality of magnetic induction members 22 is set around the center of the motor element 36, a plurality of winding terminals The connection portion 80 between the 76 and the terminal portion 30A of the winding 30 is arranged outside the range R having a central angle of 180 degrees. Therefore, it is possible to suppress the influence of the magnetic field generated on the connection portion 80 between the plurality of winding terminals 76 and the terminal portion 30A of the winding 30 on the magnetic induction member 22. As a result, the magnetism generated from the rotor magnet 40 can be accurately detected by the magnetic detection sensor 58.

Next, a modified example of one embodiment of the present invention will be described.

In the above embodiment, the relationship between the number of the plurality of magnetic poles formed in the rotor magnet 40 and the number of the plurality of slots 34 in the stator 12 is 10 poles 12 slots or 14 poles 12 slots. Other than that is fine.

Further, in the above embodiment, the center piece 18 has a plate-shaped portion 48 and a support portion 50 which are separately formed from each other, but has a configuration in which the plate-shaped portion 48 and the support portion 50 are integrally provided. It may have been done. Further, when the center piece 18 is configured to integrally include the plate-shaped portion 48 and the support portion 50, the entire center piece 18 may be formed of a magnetic material such as iron.

Further, in the above embodiment, the plate-shaped portion 48 is an iron pressed part, but it may be other than the iron pressed part.

Further, in the above embodiment, the number of the magnetic induction member 22 and the magnetic detection sensor 58 is set to 3 each, but the number may be other than 3 each.

Further, in the above embodiment, the magnetic induction member 22 is formed in a straight rod shape, but may have a shape other than the straight rod shape.

Further, in the above embodiment, the cover member 26 is made of resin, but may be made of a non-magnetic material other than resin such as aluminum.

Further, in the above embodiment, the cover member 26 is independently manufactured by resin molding and then assembled to the plate-shaped portion 48, but may be integrated with the plate-shaped portion 48 by outsert molding.

Further, in the above embodiment, the cover member 26 is fixed to the plate-shaped portion 48 by caulking a plurality of protrusions 92, but the plate-shaped portion 26 is fixed to the plate-shaped portion 48 by a fixing method other than the caulking process, for example, screwing. It may be fixed to 48.

Further, in the above embodiment, the cover member 26 is arranged on one surface side (arrow A1 side) of the plate-shaped portion 48, but as shown in FIG. 9, the cover member 26 is arranged on the other surface side (arrow) of the plate-shaped portion 48. It may be arranged on the A2 side). Further, in this case, the main body portion 88 of the cover member 26 may be adhered to the plate-shaped portion 48 by the adhesive 104, and the bulging portion 90 may protrude to one side of the plate-shaped portion 48 through the through hole 54. ..

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be variously modified and implemented within a range not deviating from the gist thereof. Is.

In addition, the following additional notes are further described with respect to one embodiment of the present invention.

(Appendix 1)
An annular stator having a plurality of radially extending teeth and windings wound around the plurality of teeth.
A rotor having a rotor magnet arranged so as to face the stator on the radial outer side of the stator and forming a motor element together with the stator.
A support member that supports the motor element and
A circuit board on which a magnetic detection sensor is mounted and
A magnetic induction member that extends from the rotor magnet side to the magnetic detection sensor side and guides the magnetism generated from the rotor magnet to the magnetic detection sensor.
A plurality of terminals connecting the circuit board and the winding,
With
The connection portion between the plurality of terminals and the terminal portion of the winding is arranged outside the range of a central angle of 180 degrees including the magnetic induction member with the central portion of the motor element as the center.
Brushless motor.
(Appendix 2)
As the magnetic guiding member, three magnetic guiding members including a first magnetic guiding member, a second magnetic guiding member, and a third magnetic guiding member are provided.
The relationship between the number of the plurality of magnetic poles formed in the rotor magnet and the number of the plurality of slots formed between the plurality of teeth in the stator is 10 poles 12 slots or 14 poles 12 slots. ,
The first magnetic induction member is arranged on a line that bisects the opening angle of one of the plurality of slots.
The second magnetic induction member is arranged on one side of the plurality of teeth with respect to the central axis of one tooth adjacent to the one slot.
The third magnetic induction member is arranged on the other side of the central axis of the one tooth.
The brushless motor according to Appendix 1.

10 ... brushless motor, 12 ... stator, 14 ... rotor, 16 ... shaft, 18 ... center piece (an example of support member), 20 ... circuit board, 22 ... magnetic induction member, 22A ... first magnetic induction member, 22B ... first (Ii) Magnetic induction member, 22C ... Third magnetic induction member, 24 ... Connector housing (example of first holding member), 26 ... Cover member (example of second holding member), 28 ... Stator core, 30 ... Winding, 30A ... End of winding, 32 ... Teeth, 32A ... One tooth, 34 ... Slot, 34A ... One slot, 36 ... Motor element, 38 ... Rotor housing, 40 ... Rotor magnet, 42 ... Bearing housing, 44 ... Bearing , 46 ... Vent hole, 48 ... Plate-shaped part, 50 ... Support part, 52 ... Positioning part, 54 ... Through hole, 56 ... Support hole, 58 ... Magnetic detection sensor, 60 ... First protruding part (example of protruding part) , 62 ... Second protruding part, 64 ... Cover part, 66 ... Connector part, 68 ... Space, 70 ... Opposing part, 72 ... Boss part, 74 ... Side wall part, 76 ... Winding terminal (example of terminal), 78 ... Communication hole, 80 ... Connection part, 82 ... Partition part, 84 ... Connector terminal, 86 ... Connector terminal, 88 ... Main body part, 88A ... Contact surface, 90 ... Swelling part, 92 ... Protrusion part, 94 ... Fitting part, 96 ... Fitted part, 98 ... Recessed shape, 98A ... Bottom surface, 100 ... Fitting hole, 102 ... Seal member, La ... Line that divides the opening angle of one slot into two equal parts, Lb ... Central axis of one tooth, R ... Range of central angle 180 degrees

Claims (13)

An annular stator having a plurality of radially extending teeth and windings wound around the plurality of teeth.
A rotor having a rotor magnet arranged so as to face the stator on the radial outer side of the stator and forming a motor element together with the stator.
A support member that supports the motor element and
A circuit board on which a magnetic detection sensor is mounted and
A magnetic induction member that extends from the rotor magnet side to the magnetic detection sensor side and guides the magnetism generated from the rotor magnet to the magnetic detection sensor.
A plurality of terminals connecting the circuit board and the winding, and a first holding member that holds the circuit board and is supported by the support member.
A second holding member that is configured separately from the first holding member, holds the magnetic induction member, and is supported by the support member,
Equipped with a,
As the magnetic guiding member, three magnetic guiding members including a first magnetic guiding member, a second magnetic guiding member, and a third magnetic guiding member are provided.
The relationship between the number of the plurality of magnetic poles formed in the rotor magnet and the number of the plurality of slots formed between the plurality of teeth in the stator is 10 poles 12 slots or 14 poles 12 slots. ,
The first magnetic induction member is arranged on a line that bisects the opening angle of one of the plurality of slots.
The second magnetic induction member is arranged on one side of the plurality of teeth with respect to the central axis of one tooth adjacent to the one slot.
The third magnetic induction member is arranged on the other side of the central axis of the one tooth.
Brushless motor. The support member has a plate-shaped portion having the axial direction of the motor element as the plate thickness direction.
The magnetic guiding member is inserted into a through hole formed in the plate-shaped portion, and the magnetic guiding member is inserted into the through hole.
The motor element is disposed on one side of the plate portion,
The second holding member is arranged within the range of the plate-shaped portion when viewed from the axial direction and in a state of being in surface contact with the plate-shaped portion on one surface side of the plate-shaped portion.
The circuit board and the first holding member are arranged on the other side of the plate-shaped portion.
The brushless motor according to claim 1. An annular stator having a plurality of radially extending teeth and windings wound around the plurality of teeth.
A rotor having a rotor magnet arranged so as to face the stator on the radial outer side of the stator and forming a motor element together with the stator.
A support member having a plate-shaped portion whose axial direction is the plate thickness direction of the motor element and supporting the motor element on one surface side of the plate-shaped portion.
A circuit board on which a magnetic detection sensor is mounted and
A plurality of terminals connecting the circuit board and the winding, and a first holding member that holds the circuit board and is supported by the support member in a state of being arranged on the other side of the plate-shaped portion. ,
A magnetic induction member that extends from the rotor magnet side to the magnetic detection sensor side and guides the magnetism generated from the rotor magnet to the magnetic detection sensor.
The magnetic guiding member is formed separately from the first holding member and is inserted into the through hole formed in the plate-shaped portion, and holds the magnetic guiding member within the range of the plate-shaped portion when viewed from the axial direction. A second holding member arranged on one surface side of the plate-shaped portion and supported by the support member in a state of being in surface contact with the plate-shaped portion.
Brushless motor equipped with. The peripheral portion of the second holding member and the plate-shaped portion are sealed.
The brushless motor according to claim 2 or 3. The magnetic guiding member has a protruding portion that projects to one side of the plate-shaped portion.
The second holding member has a bulging portion that bulges on one side of the plate-shaped portion and covers the protruding portion.
The brushless motor according to any one of claims 2 to 4. The first holding member has a cover portion for accommodating the circuit board in cooperation with the plate-shaped portion.
The brushless motor according to any one of claims 2 to 5. The first holding member has a connector portion that surrounds a plurality of connector terminals electrically connected to the circuit board.
The cover portion and the connector portion are integrally formed.
The brushless motor according to claim 6. The plate-shaped portion is made of a magnetic material and is formed of a magnetic material.
The second holding member is made of a non-magnetic material.
The brushless motor according to any one of claims 2 to 7. The plate-shaped portion is an iron pressed part.
The brushless motor according to claim 8. A fitting portion is formed in the plate-shaped portion, and a fitting portion is formed.
The second holding member is formed with a fitted portion fitted with the fitting portion with the plate thickness direction of the plate-shaped portion as the insertion direction.
The brushless motor according to any one of claims 2 to 9. The fitting portion includes a concave recess that is recessed in the plate thickness direction of the plate-shaped portion.
The fitted portion includes a main body portion of the second holding member housed in the recess.
The brushless motor according to claim 10. The magnetic guiding member extends in the plate thickness direction of the plate-shaped portion and extends.
The recess has a bottom surface orthogonal to the plate thickness direction of the plate-shaped portion.
The main body portion has a contact surface that is orthogonal to the plate thickness direction of the plate-shaped portion and is in surface contact with the bottom surface.
The brushless motor according to claim 11. The connection portion between the plurality of terminals and the terminal portion of the winding is arranged outside the range of a central angle of 180 degrees including the magnetic induction member with the central portion of the motor element as the center.
The brushless motor according to any one of claims 1 to 12.

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