Motor and pump device

Abstract

To provide a motor capable of suppressing the damage of a soldered part on a circuit board that is a portion to which a terminal pin is soldered and fixed, even if a thermal deformation amount of a board holding member is enlarged in the motor comprising the circuit board for controlling the motor and the resin board holding member for holding the circuit board.SOLUTION: In a motor, there are formed on a board holding member 7 a board contact face 7e with which a face of a protrusion 6a of a circuit board 6 on the side of a direction Z2 is brought into contact, first regulation parts 7f disposed at both sides of the protrusion 6a in a circumferential direction of a rotor, and a second regulation part 7g disposed in the protrusion 6a on the side of a direction Z1. In a radial direction of the rotor, a clearance is formed between an outer peripheral surface of the circuit board 6 and the board holding member 7. An elastic member 30 is disposed between the protrusion 6a and the second regulation part 7g, and movement of the circuit board 6 with respect to the board holding member 7 in the radial direction of the rotor is regulated by an elastic force of the elastic member 30.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a motor used in a pump device, etc. The present invention also relates to a pump device equipped with such a motor. [Background technology]

[0002] Conventionally, motors used in pump devices are known (see, for example, Patent Document 1). The motor described in Patent Document 1 includes a cylindrical stator, a rotor disposed inside the stator, a resin housing that covers the stator, and a circuit board for driving and controlling the motor. The stator includes a driving coil, a stator core around which the driving coil is wound via an insulator, and a plurality of terminal pins (winding terminals) to which ends of the driving coil are connected.

[0003] In the motor described in Patent Document 1, the circuit board is a rigid board such as a glass epoxy board, and is formed in a flat plate shape. The thickness direction of the circuit board coincides with the axial direction of the rotor. Ends of a plurality of terminal pins are soldered and fixed to the circuit board. Two cylindrical portions for fixing the circuit board are formed in the housing. The circuit board is fixed to the housing by screws (specifically, tapping screws) screwed into the inner circumference of the cylindrical portions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-102076 A Summary of the Invention [Problem to be solved by the invention]

[0005] If the motor described in Patent Document 1 is used in an environment with rapid temperature changes, there is a risk that the amount of thermal deformation of the resin housing (i.e., the amount of thermal expansion or contraction of the housing) will be large. Also, in the motor described in Patent Document 1, since the circuit board is fixed to the housing with screws, when the housing is thermally deformed (i.e., when the housing thermally expands or contracts), the circuit board is likely to deform in the radial direction of the rotor in response to the thermal deformation of the housing.

[0006] Therefore, if the motor described in Patent Document 1 is used in an environment with rapid temperature changes and the amount of thermal deformation of the housing increases, the amount of deformation of the circuit board in the radial direction of the rotor may increase. Also, if the amount of deformation of the circuit board in the radial direction of the rotor increases, the stress of the soldered portion of the circuit board, where the terminal pin is soldered and fixed, increases, and there is a risk of the soldered portion being damaged.

[0007] Therefore, an object of the present invention is to provide a motor including a circuit board for controlling the motor and a resin board holding member for holding the circuit board, which is capable of suppressing damage to the soldered portion of the circuit board where the terminal pins are soldered and fixed, even if the amount of thermal deformation of the board holding member increases. Another object of the present invention is to provide a pump device including such a motor. [Means for solving the problem]

[0008] In order to solve the above problems, a motor of the present invention is a motor having a rotor and a stator, the motor comprising a circuit board for controlling the motor, and a resin board holding member for holding the circuit board, the stator comprising a drive coil, a stator core around which the drive coil is wound, and a plurality of terminal pins to which ends of the drive coil are connected, one side in the axial direction of the rotor is defined as a first direction side, and the opposite side to the first direction side is defined as a second direction side, the thickness direction of the flat circuit board coincides with the axial direction of the rotor, the circuit board is disposed on the first direction side of the stator core, the first direction side ends of the plurality of terminal pins are soldered and fixed to the circuit board, and the circuit board is formed with a plurality of protrusions that protrude radially outward from the rotor. the board holding member is formed with a board contact surface with which the second direction side surface of the protrusion comes into contact, first regulating portions arranged on both sides of the protrusion in the circumferential direction of the rotor and regulating movement of the circuit board relative to the board holding member in the circumferential direction of the rotor, and a second regulating portion arranged on the first direction side of the protrusion and regulating movement of the circuit board relative to the board holding member in the first direction side, an elastic member is arranged between the protrusion and the second regulating portion and contacts the first direction side surface of the protrusion and the second direction side surface of the second regulating portion, a gap is formed between the outer peripheral surface of the circuit board and the board holding member in the radial direction of the rotor, and movement of the circuit board relative to the board holding member in the radial direction of the rotor is regulated by the elastic force of the elastic member.

[0009] In the motor of the present invention, the board holding member is formed with a board contact surface with which the second direction side surface of the protrusion of the circuit board comes into contact, first restricting portions arranged on both sides of the protrusion in the circumferential direction of the rotor, and a second restricting portion arranged on the first direction side of the protrusion. Also, in the present invention, a gap is formed between the outer peripheral surface of the circuit board and the board holding member in the radial direction of the rotor. Furthermore, in the present invention, an elastic member is arranged between the protrusion and the second restricting portion, which contacts the first direction side surface of the protrusion and the second direction side surface of the second restricting portion, and movement of the circuit board relative to the board holding member in the radial direction of the rotor is restricted by the elastic force of the elastic member.

[0010] Therefore, in the present invention, even if the board holding member is thermally deformed, it is possible to suppress deformation of the circuit board in the radial direction of the rotor in response to the thermal deformation of the board holding member. Therefore, in the present invention, even if the amount of thermal deformation of the board holding member increases, it is possible to suppress the amount of deformation of the circuit board in the radial direction of the rotor, and as a result, it is possible to suppress damage to the soldered portion of the circuit board, which is the portion to which the terminal pin is soldered and fixed. In addition, in the present invention, since an elastic member is disposed between the protruding portion and the second restricting portion, it is possible to suppress vibration of the circuit board relative to the board holding member even if the motor vibrates. Therefore, in the present invention, it is possible to prevent damage to the circuit board caused by vibration of the motor.

[0011] In the present invention, the elastic member is preferably a hardened elastic adhesive. With this configuration, the elastic member adheres to the first direction side surface of the protrusion and the second direction side surface of the second restriction portion, so that it is possible to prevent the elastic member from coming off between the protrusion and the second restriction portion with a simple configuration.

[0012] In the present invention, it is preferable that the substrate holding member is formed with a pair of second restricting portions that are arranged on the first direction side of one of the protruding portions and spaced apart in the circumferential direction of the rotor, and a portion of the elastic member is arranged between the pair of second restricting portions in the circumferential direction of the rotor. With this configuration, it is possible to increase the contact area between the second restricting portions and the elastic member, and therefore it is possible to increase the fixing strength of the elastic member, which is a hardened elastic adhesive, to the substrate holding member.

[0013] In the present invention, for example, the motor includes a plurality of second terminal pins for a connector held by a board holding member, and the circuit board has three protrusions arranged at a pitch of 120° with respect to the axis of the rotor when viewed from the axial direction of the rotor, one of the three protrusions being a first protrusion and one of the remaining two protrusions being a second protrusion, one circumferential side of the rotor being a third direction side and the opposite side of the third direction being a fourth direction side, the first direction side ends of the plurality of terminal pins are arranged in the circumferential direction of the rotor and are located between the first protrusion and the second protrusion in the circumferential direction of the rotor and on the third direction side of the first protrusion, and the first direction side ends of the plurality of second terminal pins are soldered and fixed to the circuit board and are located between the first protrusion and the second protrusion in the circumferential direction of the rotor and on the fourth direction side of the first protrusion.

[0014] In this case, the circuit board can be held in a well-balanced manner by the protrusions arranged at three locations with a pitch of 120°, the first restricting portion, the second restricting portion, and the elastic member. Also, in this case, even if the amount of thermal deformation of the board holding member increases, it is possible to suppress damage to the soldered portion of the circuit board where the second terminal pin is soldered and fixed.

[0015] The motor of the present invention can be used in a pump device that includes an impeller that rotates by the power of the motor, and a pump chamber in which the impeller and rotor are disposed and through which a fluid passes. In this pump device, even if the amount of thermal deformation of the board holding member increases, it is possible to suppress damage to the soldered portion of the circuit board, where the terminal pins are soldered and fixed. In addition, in this pump device, it is possible to prevent damage to the circuit board caused by vibration of the motor. Effect of the Invention

[0016] As described above, in the present invention, in a motor that includes a circuit board for controlling the motor and a resin board holding member that holds the circuit board, even if the amount of thermal deformation of the board holding member increases, it is possible to suppress damage to the soldered portion of the circuit board, where the terminal pins are soldered and fixed. [Brief description of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view of a pump device according to an embodiment of the present invention. [Diagram 2] 2 is a perspective view of the pump device shown in FIG. 1 with a case and a cover removed. [Diagram 3] 2 is a plan view of the pump device shown in FIG. 1 with a case and a cover removed. [Figure 4] 2, (B) is an enlarged view of a portion F in FIG. 3, and (C) is an enlarged view showing the circuit board and housing from the direction GG in (B). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] (Overall configuration of the pump device) Fig. 1 is a cross-sectional view of a pump device 1 according to an embodiment of the present invention. Fig. 2 is a perspective view of the pump device 1 shown in Fig. 1 with a case 8 and a cover 9 removed. In the following description, the Z1 direction in Fig. 1 etc. is the "upper" side, and the Z2 direction in Fig. 1 etc., which is opposite the upper side, is the "lower" side. Note that the "upper-lower direction" in the following description is defined for the sake of convenience, and does not necessarily coincide with the direction of a plumb line (vertical direction).

[0020] The pump device 1 of this embodiment is a type of pump called a canned pump (canned motor pump), and is used, for example, to circulate a cooling liquid. The pump device 1 includes an impeller 2 and a motor 3 that rotates the impeller 2. The motor 3 includes a rotor 4, a stator 5, and a circuit board 6 for driving and controlling the motor 3. The impeller 2, the motor 3, and the circuit board 6 are disposed inside a case body 10 that is composed of a housing 7, a case 8 that covers the lower side of the housing 7, and a cover 9 that covers the upper side of the housing 7.

[0021] The housing 7, the case 8, and the cover 9 are made of resin. The case 8 is joined to the lower end of the housing 7 by ultrasonic welding, and the cover 9 is joined to the upper end of the housing 7 by ultrasonic welding. The cover 9 in this embodiment is composed of two cover members 11 and 12. An O-ring 13 is disposed between the two cover members 11 and 12. The case 8 is formed with a fluid intake portion 8a and a fluid discharge portion (not shown). A pump chamber 14 is formed inside the case body 10, through which the fluid sucked from the intake portion 8a passes toward the discharge portion. The pump chamber 14 is defined by the housing 7 and the case 8.

[0022] The rotor 4 includes a cylindrical driving magnet 15, a cylindrical sleeve 16, and a holding member 17 that holds the driving magnet 15 and the sleeve 16. The holding member 17 is made of resin. The holding member 17 is formed in a substantially cylindrical shape with a flange. The driving magnet 15 is fixed to the outer periphery of the holding member 17, and the sleeve 16 is fixed to the inner periphery of the holding member 17. In this embodiment, the lower end of the holding member 17 is the impeller 2. That is, the impeller 2 is formed integrally with the holding member 17. However, the impeller 2 formed separately from the holding member 17 may be fixed to the lower end of the holding member 17. The impeller 2 rotates by the power of the motor 3. The impeller 2 and the rotor 4 are disposed in the pump chamber 14.

[0023] The rotor 4 is rotatably supported by a fixed shaft 18 and rotates around the fixed shaft 18. The fixed shaft 18 is disposed so that the axial direction of the fixed shaft 18 coincides with the up-down direction. That is, the up-down direction is the axial direction of the rotor 4. The upper side (Z1 direction side) of this embodiment is the first direction side, which is one side of the axial direction of the rotor 4, and the lower side (Z2 direction side) is the second direction side, which is the opposite side to the first direction side. In the following description, the radial direction of the rotor 4 is referred to as the "radial direction" and the circumferential direction (circumferential direction) of the rotor 4 is referred to as the "circumferential direction".

[0024] The lower end of the fixed shaft 18 is held by the case 8, and the upper end of the fixed shaft 18 is held by the housing 7. The fixed shaft 18 is inserted into the inner periphery of the sleeve 16. A thrust bearing member 19 that contacts the lower end surface of the sleeve 16 is attached to the fixed shaft 18. In this embodiment, the sleeve 16 functions as a radial bearing for the rotor 4, and the sleeve 16 and the thrust bearing member 19 function as a thrust bearing for the rotor 4.

[0025] The stator 5 is formed in a cylindrical shape. The stator 5 is disposed on the outer periphery of the rotor 4. The stator 5 includes a driving coil 21, a stator core 22, and an insulator 23. The stator core 22 is, for example, a laminated core formed by laminating thin magnetic plates made of a magnetic material. The stator core 22 includes an outer peripheral ring portion formed in an annular shape and a plurality of salient pole portions protruding radially inward from the outer peripheral ring portion. The tip surface of the salient pole portion faces the outer peripheral surface of the driving magnet 15 via a cylindrical portion 7a (described later) constituting a part of the housing 7. The insulator 23 is formed of an insulating material such as resin. The driving coil 21 is wound around the salient pole portion of the stator core 22 via the insulator 23. That is, the driving coil 21 is wound around the stator core 22.

[0026] The stator 5 also includes a plurality of terminal pins 24 to which ends of the drive coil 21 are connected. The stator 5 of this embodiment includes five terminal pins 24. The ends of the drive coil 21 are bound to and fixed to the terminal pins 24. The lower ends of the five terminal pins 24 are fixed to the insulator 23. The upper ends of the five terminal pins 24 are soldered and fixed to the circuit board 6. That is, the drive coil 21 is electrically connected to the circuit board 6 via the terminal pins 24. The lower parts of the five terminal pins 24 are embedded in the housing 7.

[0027] As described above, the housing 7 is made of resin. The housing 7 is formed integrally with the stator 5 so as to cover a portion of the stator 5. In this embodiment, the housing 7 is molded integrally with the stator 5 by insert molding. The housing 7 constitutes a part of the motor 3. The housing 7 completely covers the driving coil 21. The housing 7 has a cylindrical portion 7a disposed between the tip surface of the salient pole portion of the stator core 22 and the outer peripheral surface of the driving magnet 15, and a bottom portion 7b that closes the upper end of the cylindrical portion 7a. When viewed from above, the outer shape of the upper end of the housing 7 is a circle centered on the axis of the rotor 4 (i.e., the axis of the fixed shaft 18).

[0028] A recess 7c is formed on the upper side of the bottom 7b, recessed downward from the upper end surface of the housing 7. When viewed from above, the side shape of the recess 7c is a circle centered on the axis of the rotor 4. The bottom 7b and the recess 7c are disposed above the driving coil 21, the stator core 22, and the insulator 23. The circuit board 6 is disposed above the recess 7c. The housing 7 serves to prevent the fluid in the pump chamber 14 from flowing into the location where the stator 5 and the circuit board 6 are disposed. The cover 9 is fixed to the upper end of the housing 7 so as to cover the circuit board 6 disposed above the recess 7c from above and from the outside in the radial direction. A more specific configuration of the housing 7 will be described later.

[0029] The circuit board 6 is a rigid board such as a glass epoxy board, and is formed in a flat plate shape. The thickness direction of the circuit board 6 coincides with the up-down direction. As described above, the circuit board 6 is disposed above the recess 7c. That is, the circuit board 6 is disposed above the stator core 22. The circuit board 6 is also disposed outside the pump chamber 14. The circuit board 6 is held by the housing 7. The housing 7 in this embodiment is a board holding member that holds the circuit board 6. A more specific configuration of the circuit board 6 will be described later.

[0030] Upper ends of a plurality of terminal pins 27 for a connector are soldered and fixed to the circuit board 6. In this embodiment, ends of four terminal pins 27 are soldered and fixed to the circuit board 6. The four terminal pins 27 are held by the housing 7. That is, the motor 3 includes four terminal pins 27 held by the housing 7. Some of the four terminal pins 27 are disposed in a connector portion 7d formed in the housing 7. The terminal pins 27 in this embodiment are second terminal pins.

[0031] (Circuit board and housing configuration) Fig. 3 is a plan view of the pump device 1 shown in Fig. 1 with the case 8 and cover 9 removed. Fig. 4(A) is an enlarged view of part E in Fig. 2, Fig. 4(B) is an enlarged view of part F in Fig. 3, and Fig. 4(C) is an enlarged view showing the circuit board 6 and the housing 7 from the direction GG in Fig. 4(B).

[0032] In the following description, a predetermined direction perpendicular to the up-down direction (left-right direction in Fig. 3) is referred to as the "left-right direction," and a direction perpendicular to the up-down direction and left-right directions is referred to as the "front-rear direction." In addition, the X1 direction in Fig. 3, which is one side of the front-rear direction, is referred to as the "front" side, the X2 direction in Fig. 3, which is the opposite side, is referred to as the "rear" side, the Y1 direction in Fig. 3, which is one side of the left-right direction, is referred to as the "right" side, and the Y2 direction in Fig. 3, which is the opposite side, is referred to as the "left" side.

[0033] The circuit board 6 is formed in a substantially circular plate shape. As described above, the thickness direction of the circuit board 6 coincides with the vertical direction. Through holes are formed in the circuit board 6, through which the upper ends of the terminal pins 24 and 27 are inserted. In addition, a plurality of protrusions 6a protruding radially outward are formed in the circuit board 6. Three protrusions 6a are formed in the circuit board 6 of this embodiment. The three protrusions 6a are arranged at a pitch of 120° with respect to the axis of the rotor 4 when viewed from the vertical direction. The protrusions 6a are formed in three places: the rear end of the circuit board 6, the right front side of the circuit board 6, and the left front side of the circuit board 6. The protrusions 6a are formed in a rectangular flat plate shape.

[0034] As shown in FIG. 3, the upper ends of the five terminal pins 24 fixed to the circuit board 6 are arranged in the circumferential direction. Specifically, the upper ends of the five terminal pins 24 are arranged at a constant pitch in the circumferential direction. For example, the upper ends of the five terminal pins 24 are arranged at a pitch of about 30° with respect to the axis of the rotor 4 when viewed from the top-bottom direction. Furthermore, the upper ends of the five terminal pins 27 are arranged rearward of the center of the circuit board 6 in the front-rear direction. The upper ends of the four terminal pins 27 fixed to the circuit board 6 are arranged at a constant pitch in the left-right direction. Furthermore, the upper ends of the four terminal pins 27 are fixed to the front end of the circuit board 6. The upper ends of the four terminal pins 27 are arranged in the center of the circuit board 6 in the left-right direction.

[0035] The protrusion 6a arranged on the left front side of the three protrusions 6a is the first protrusion 6a1 (see FIG. 3), the protrusion 6a arranged on the right front side of the remaining two protrusions 6a is the second protrusion 6a2 (see FIG. 3), one side in the circumferential direction (specifically, the clockwise direction side in FIG. 3) is the third direction side, and the opposite side of the third direction side (i.e., the counterclockwise direction side in FIG. 3) is the fourth direction side, the upper ends of the five terminal pins 24 are arranged between the first protrusion 6a1 and the second protrusion 6a2 in the circumferential direction and on the third direction side of the first protrusion 6a1. The upper ends of the four terminal pins 27 are arranged between the first protrusion 6a1 and the second protrusion 6a2 in the circumferential direction and on the fourth direction side of the first protrusion 6a1.

[0036] The housing 7 is formed with a board contact surface 7e with which the lower surface of the protrusion 6a comes into contact. The board contact surface 7e is a plane perpendicular to the up-down direction. The housing 7 is also formed with first restricting portions 7f that are arranged on both sides of the protrusion 6a in the circumferential direction and restrict the movement of the circuit board 6 relative to the housing 7 in the circumferential direction. That is, the housing 7 is formed with a pair of first restricting portions 7f at three locations. The inner surfaces of the pair of first restricting portions 7f in the circumferential direction are planes perpendicular to the circumferential direction. A small gap is formed between the inner surfaces of the pair of first restricting portions 7f in the circumferential direction and the side surfaces of the protrusion 6a in the circumferential direction.

[0037] Furthermore, the housing 7 is formed with a second restricting portion 7g that is disposed above the protrusion 6a and restricts the upward movement of the circuit board 6 relative to the housing 7. In this embodiment, a pair of second restricting portions 7g that are disposed above one protrusion 6a are formed on the housing 7. That is, the housing 7 is formed with a pair of second restricting portions 7g at three locations. The pair of second restricting portions 7g are disposed with a gap therebetween in the circumferential direction. The lower surface of the second restricting portion 7g is a flat surface that is perpendicular to the up-down direction.

[0038] The outer ends of the pair of second restricting portions 7g in the circumferential direction are connected to the upper end of the first restricting portion 7f. In this embodiment, the first restricting portion 7f and the second restricting portion 7g are formed by applying heat to a rectangular parallelepiped crimping protrusion 7k (see FIG. 4(C)) that rises upward from the board contact surface 7e and deforming the protrusion 7k, thereby performing thermal crimping. The lower surface of the second restricting portion 7g is disposed above the protrusion 6a and does not contact the upper surface of the protrusion 6a. The tip surface (radial outer end surface) of the protrusion 6a is disposed at the same radial position as the radial outer side surface of the first restricting portion 7f and the second restricting portion 7g in terms of design.

[0039] As shown in FIG. 4(C), an elastic member 30 is disposed between the protruding portion 6a and the second restricting portion 7g, contacting the upper surface of the protruding portion 6a and the lower surface of the second restricting portion 7g. The elastic member 30 is a hardened elastic adhesive. Therefore, the elastic member 30 adheres to the upper surface of the protruding portion 6a and the lower surface of the second restricting portion 7g. As shown in FIG. 4(A) and other figures, a portion of the elastic member 30 is disposed between the pair of second restricting portions 7g in the circumferential direction. Specifically, a portion of the elastic member 30 fills the entire area between the pair of second restricting portions 7g in the circumferential direction.

[0040] A gap is formed between the outer peripheral surface of the circuit board 6 and the housing 7 in the radial direction. Specifically, a gap is formed between the outer peripheral surface of the circuit board 6 except for the portion where the three protrusions 6a are formed and the side surface of the recess 7c in the radial direction. As described above, the circuit board 6 is disposed on the upper side of the recess 7c, and the lower surface of the circuit board 6 does not contact the housing 7 except for the protrusions 6a. The lower surface of the protrusions 6a is not bonded to the board contact surface 7e, and the protrusions 6a are not fixed to the board contact surface 7e. In addition, the circumferential side surface of the protrusions 6a is not bonded to the circumferential inner surfaces of the pair of first restricting portions 7f, and the protrusions 6a are not fixed to the pair of first restricting portions 7f. Furthermore, the housing 7 does not have a portion disposed outside the protrusions 6a in the radial direction.

[0041] Therefore, in this embodiment, the movement of the circuit board 6 relative to the housing 7 in the radial direction is restricted by the elastic force of the elastic member 30. More specifically, the movement of the circuit board 6 relative to the housing 7 in the radial direction is restricted only by the elastic force of the elastic member 30. In other words, the circuit board 6 is not constrained by the housing 7 in the radial direction at locations other than the elastic member 30, and as long as the upper ends of the terminal pins 24, 27 are not inserted into the through holes of the circuit board 6, the circuit board 6 is movable in the radial direction relative to the housing 7 within the range of elastic deformation of the elastic member 30.

[0042] In this embodiment, the board contact surface 7e, the first restricting portion 7f, the second restricting portion 7g, and the elastic member 30 form board holding portions 32 for the housing 7 to hold the circuit board 6. The housing 7 holds the circuit board 6 only by the board holding portions 32 arranged in three locations.

[0043] (Main effects of this form) As described above, in this embodiment, the movement of the circuit board 6 relative to the housing 7 in the radial direction is restricted by the elastic force of the elastic member 30 disposed between the protruding portion 6a of the circuit board 6 and the second restricting portion 7g of the housing 7. Therefore, in this embodiment, even if the housing 7 is thermally deformed, it is possible to suppress the radial deformation of the circuit board 6 corresponding to the thermal deformation of the housing 7. Therefore, in this embodiment, even if the amount of thermal deformation of the housing 7 increases, it is possible to suppress the amount of deformation of the circuit board 6 in the radial direction. As a result, in this embodiment, even if the amount of thermal deformation of the housing 7 increases, it is possible to suppress damage to the soldered portion of the circuit board 6, which is the portion where the terminal pins 24, 27 are soldered and fixed, even if the amount of thermal deformation of the housing 7 increases.

[0044] In addition, in this embodiment, since the elastic member 30 is disposed between the protrusion 6a and the second restricting portion 7g, even if the pump device 1 vibrates, it is possible to suppress vibration of the circuit board 6 relative to the housing 7. Therefore, in this embodiment, it is possible to prevent damage to the circuit board 6 caused by vibration of the pump device 1.

[0045] In this embodiment, the elastic member 30 is a hardened elastic adhesive, and is attached to the upper surface of the protruding portion 6a and the lower surface of the second restricting portion 7g. Therefore, in this embodiment, it is possible to prevent the elastic member 30 from coming off between the protruding portion 6a and the second restricting portion 7g with a simple configuration. In addition, in this embodiment, a part of the elastic member 30, which is a hardened elastic adhesive, is disposed between the pair of second restricting portions 7g in the circumferential direction, so that it is possible to increase the contact area between the second restricting portion 7g and the elastic member 30. Therefore, in this embodiment, it is possible to increase the fixing strength of the elastic member 30 to the housing 7. In addition, in this embodiment, the three protruding portions 6a are disposed at a pitch of 120° with respect to the axis of the rotor 4, so that the protruding portions 6a disposed at three locations and the board holding portion 32 can hold the circuit board 6 in a well-balanced manner.

[0046] (Other embodiments) The above-described embodiment is one example of a preferred embodiment of the present invention, but the present invention is not limited to this embodiment and various modifications are possible without departing from the spirit and scope of the present invention.

[0047] In the above-described embodiment, a portion of the elastic member 30 may not be disposed between the pair of second restriction portions 7g in the circumferential direction. In addition, in the above-described embodiment, the elastic member 30 may not be a hardened elastic adhesive. For example, the elastic member 30 may be a non-adhesive material such as rubber. In this case, the elastic member 30 is not attached to the upper surface of the protrusion 6a and the lower surface of the second restriction portion 7g.

[0048] In the above embodiment, one second restricting portion 7g that connects the upper ends of a pair of first restricting portions 7f may be disposed on the upper side of one protruding portion 6a. In addition, in the above embodiment, the three protruding portions 6a may not be disposed at a pitch of 120° with respect to the axis of the rotor 4. For example, the protruding portions 6a may be formed at three locations, namely, the rear end portion of the circuit board 6, the right end portion of the circuit board 6, and the left end portion of the circuit board 6. Furthermore, in the above embodiment, the number of protruding portions 6a formed on the circuit board 6 may be four or more. In this case, the same number of board holding portions 32 as the number of protruding portions 6a are provided. In addition, the motor 3 to which the present invention is applied may be used in a device other than the pump device 1.

[0049] (Configuration of this technology) The present technology can be configured as follows. (1) In a motor having a rotor and a stator, a circuit board for controlling the motor; and a resin board holding member for holding the circuit board, the stator includes a driving coil, a stator core around which the driving coil is wound, and a plurality of terminal pins to which ends of the driving coil are connected; If one side of the rotor in the axial direction is defined as a first direction side, and the opposite side to the first direction side is defined as a second direction side, a thickness direction of the flat circuit board coincides with an axial direction of the rotor, the circuit board is disposed on the first direction side of the stator core, Ends of the plurality of terminal pins on the first direction side are soldered and fixed to the circuit board, a plurality of protrusions protruding outward in a radial direction of the rotor are formed on the circuit board; the board holding member is formed with a board contact surface with which a surface of the protrusion on the second direction side comes into contact, first restricting portions that are arranged on both sides of the protrusion in the circumferential direction of the rotor and restrict movement of the circuit board relative to the board holding member in the circumferential direction of the rotor, and second restricting portions that are arranged on the first direction side of the protrusion and restrict movement of the circuit board relative to the board holding member in the first direction, an elastic member is disposed between the protruding portion and the second restricting portion, the elastic member being in contact with a surface of the protruding portion on the first direction side and a surface of the second restricting portion on the second direction side; a gap is formed between an outer circumferential surface of the circuit board and the board holding member in a radial direction of the rotor, a circuit board supporting member configured to support the circuit board in a radial direction of the rotor, the circuit board being supported by the circuit board supporting member; (2) The motor according to (1), wherein the elastic member is a hardened elastic adhesive. (3) The substrate holding member is provided with a pair of the second restricting portions that are disposed on one of the protruding portions on the first direction side and that are spaced apart from each other in the circumferential direction of the rotor, The motor according to (2), wherein a portion of the elastic member is disposed between a pair of the second restriction portions in the circumferential direction of the rotor. (4) A plurality of second terminal pins for a connector are provided and held by the board holding member; The circuit board is provided with three protrusions arranged at a pitch of 120° with respect to an axis of the rotor when viewed from the axial direction of the rotor, When one of the three protruding portions is a first protruding portion, one of the remaining two protruding portions is a second protruding portion, one side in the circumferential direction of the rotor is a third direction side, and the opposite side to the third direction is a fourth direction side, end portions of the terminal pins on the first direction side are arranged in a circumferential direction of the rotor, between the first protruding portion and the second protruding portion in the circumferential direction of the rotor, and on the third direction side of the first protruding portion, The motor described in any one of (1) to (3), characterized in that the ends of the second terminal pins on the first direction side are soldered and fixed to the circuit board, and are located between the first protrusion and the second protrusion in the circumferential direction of the rotor and on the fourth direction side of the first protrusion. (5) A pump device comprising: a motor according to any one of (1) to (4); an impeller that rotates by the power of the motor; and a pump chamber in which the impeller and the rotor are disposed and through which a fluid passes. [Explanation of symbols]

[0050] 1 Pumping equipment 2 Impeller 3 Motor 4 Rotors 5 Stator 6 Circuit Board 6a Protrusion 6a1 1st protrusion 6a2 Second protrusion 7 Housing (board holding member) 7e Board contact surface 7f 1st Regulatory Department 7g Second Regulatory Section 14 Pump Room 21 Driving coil 22 Stator core 24 terminal pins 27 Terminal pin (2nd terminal pin) 30 Elastic member Z1 1st direction side Z2 2nd direction side

Claims

1. In a motor having a rotor and a stator, a circuit board for controlling the motor; and a resin board holding member for holding the circuit board, the stator includes a driving coil, a stator core around which the driving coil is wound, and a plurality of terminal pins to which ends of the driving coil are connected; When one side in the axial direction of the rotor is defined as a first direction side and the opposite side to the first direction side is defined as a second direction side, a thickness direction of the flat circuit board coincides with an axial direction of the rotor, the circuit board is disposed on the first direction side of the stator core, Ends of the plurality of terminal pins on the first direction side are soldered and fixed to the circuit board, a plurality of protrusions protruding outward in a radial direction of the rotor are formed on the circuit board; the board holding member is formed with a board contact surface with which a surface of the protrusion on the second direction side comes into contact, first restricting portions that are arranged on both sides of the protrusion in the circumferential direction of the rotor and restrict movement of the circuit board relative to the board holding member in the circumferential direction of the rotor, and second restricting portions that are arranged on the first direction side of the protrusion and restrict movement of the circuit board relative to the board holding member in the first direction, an elastic member is disposed between the protruding portion and the second restricting portion, the elastic member being in contact with a surface of the protruding portion on the first direction side and a surface of the second restricting portion on the second direction side; a gap is formed between an outer circumferential surface of the circuit board and the board holding member in a radial direction of the rotor, a circuit board supporting member configured to support the circuit board in a radial direction of the rotor, the circuit board being supported by the circuit board supporting member;

2. 2. The motor according to claim 1, wherein the elastic member is a hardened elastic adhesive.

3. a pair of second restricting portions are formed on the substrate holding member, the pair of second restricting portions being disposed on one of the protruding portions on the first direction side and spaced apart in a circumferential direction of the rotor; 3. The motor according to claim 2, wherein a portion of the elastic member is disposed between the pair of second restriction portions in the circumferential direction of the rotor.

4. a plurality of second terminal pins for a connector held by the board holding member; the circuit board is provided with three protrusions arranged at a pitch of 120° with respect to an axis of the rotor when viewed in the axial direction of the rotor, When one of the three protruding portions is a first protruding portion, one of the remaining two protruding portions is a second protruding portion, one side in the circumferential direction of the rotor is a third direction side, and the side opposite to the third direction is a fourth direction side, end portions of the terminal pins on the first direction side are arranged in a circumferential direction of the rotor, between the first protruding portion and the second protruding portion in the circumferential direction of the rotor, and on the third direction side of the first protruding portion, 4. The motor according to claim 1, wherein the ends of the second terminal pins on the first direction side are soldered and fixed to the circuit board, and are positioned between the first protrusion and the second protrusion in the circumferential direction of the rotor and on the fourth direction side of the first protrusion.

5. 4. A pump device comprising: the motor according to claim 1; an impeller that rotates by power of the motor; and a pump chamber in which the impeller and the rotor are disposed and through which a fluid passes.

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