JP4695010B2 - Brushless motor with built-in circuit board - Google Patents

Description

  The present invention relates to a circuit board built-in brushless motor in which a circuit board is arranged inside a motor case.

Conventionally, a brushless motor with a built-in circuit board is applied to, for example, a DC can pump that sucks fluid from a suction port, pressurizes the fluid by centrifugal force of an internal impeller, and discharges the fluid from the discharge port (for example, Patent Document 1).
Specifically, as shown in FIG. 4, in the DC can pump 100, a space surrounded by a motor casing 101 and a cup-shaped partition wall (so-called can) 102 forms a fixed chamber 104. Here, the stator 110 of the brushless motor 107 is arranged. A space surrounded by the opposite cup-shaped partition wall 102 and the pump casing 104, which is separated by the stator 110 and the cup-shaped partition wall 102, becomes a rotation chamber 105 and a pump chamber 106 connected thereto, and the rotor is placed in this space. 120 and an impeller 130 integral therewith are arranged.

  In addition, the motor casing 101 is electrically connected to the stator 110 and is configured by two circuit boards, a magnetic pole detection board 131 and a driving board 116, in order to control energization of the brushless motor 107. .

  On the magnetic pole detection substrate 131, a plurality of magnetic pole detection elements 114 for detecting the magnetic pole positions of the permanent magnets 121 constituting a part of the rotor 120 are laid out and attached to the cup-shaped partition wall 102 with fixing screws 133.

  A driving board 116 is disposed so as to be overlapped in the axial direction, and the driving board 116 is provided with a drive IC for rotationally driving the rotor 120 and the impeller 130 integrated therewith. .

  The magnetic pole detection element 114 on the magnetic pole detection board 131 and the drive IC on the driving board 116 are electrically connected by magnetic pole detection element connectors 118 and 118 and a magnetic pole detection element signal cable 119.

  That is, the output signal of the magnetic pole detection element 114 is transmitted to the drive IC through the magnetic pole detection element connectors 118 and 118 and the magnetic pole detection element signal cable 119, and is sent to the multi-phase stator winding 113 according to the output signal of the magnetic pole detection element 114. An electric current is passed to generate a magnetic pole of an electromagnet in the stator 110, and a rotational torque in one direction is generated by attracting and repelling the magnetic force with the permanent magnet 121.

  However, in the brushless motor 107 with a built-in circuit board described in Patent Document 1, the magnetic pole detection element 114 on the magnetic pole detection board 131 and the drive IC on the drive board 116 are the magnetic pole detection element connectors 118 and 118 and the magnetic pole detection element. The signal cable 119 is electrically connected. For this reason, since the magnetic detection element connectors 118 and 118 are disposed between the two circuit boards 131 and 116, it is difficult to narrow the interval between the opposing portions in the axial direction. As a result, a brushless motor or an electric power applying this brushless motor is applied. There is a problem that the entire device becomes larger.

  Further, since the magnetic detection element signal cable 119 connected between the magnetic detection element connectors 118 and 118 is used, there is a high possibility that noise is included in the output signal of the magnetic detection element 114, and the accuracy of the magnetic detection signal is improved. There is a problem of deterioration. Further, since the magnetic detection element connectors 118 and 118 and the magnetic detection element signal cable 119 are used, there is a problem that the magnetic detection element connectors 118 and 118 must be routed so as to prevent contact with other electronic components.

  Further, since expensive connection parts such as the magnetic pole detection element connectors 118 and 118 and the magnetic pole detection element signal cable 119 are increased, there is a problem that it is difficult to reduce the cost.

  In view of the above circumstances, an object of the present invention is to provide a brushless motor with a built-in circuit board, in which a dimension in the axial direction can be suppressed.

  The present invention provides a rotor portion having a drive magnet, a stator portion having a stator core disposed so as to face the outer periphery of the drive magnet, a magnetic detection element for detecting a magnetic pole position of the drive magnet, and driving the rotor portion First and second drive control circuit boards having drive control circuits to be controlled; and a motor case to which the stator core is fixed; and the first and second drive control circuit boards in the motor case Is a brushless motor with a built-in circuit board that is arranged to face each other with an interval in the axial direction, and one of the first and second drive control circuit boards penetrates the lead terminal of the magnetic detection element A through hole is formed.

  According to the present invention, there is provided a brushless motor including first and second drive control circuit boards, wherein one of the first and second drive control circuit boards penetrates a lead terminal of the magnetic detection element. Since the through hole is formed, the distance between the first and second drive control circuit boards in the axial direction can be reduced as compared with the conventional one, and the brushless motor with a built-in circuit board can be reduced in size. be able to.

  Further, according to the present invention, the first drive control circuit board is provided with a circuit for controlling the driving of the rotor portion, and the second drive control circuit board is provided with a drive coil wound around the stator core. A circuit for controlling power feeding is provided, and the drive magnet, the second drive control circuit board, and the first drive control circuit board are arranged in the axial direction in this order, and the through hole is formed in the second drive control circuit board. Preferably it is formed.

  According to the present invention, the lead terminal of the magnetic detection element can be directly electrically connected to the first drive control circuit board. Therefore, it is possible to prevent noise from appearing on the output signal of the magnetic detection element.

  It is preferable that a plurality of the magnetic detection elements are arranged between adjacent drive coils, and one through hole through which the lead terminals of the plurality of magnetic detection elements pass is formed. Thereby, the processing time which forms a through-hole is shortened, and it can manufacture at low cost.

  According to the present invention, there is provided a brushless motor including first and second drive control circuit boards, wherein one of the first and second drive control circuit boards penetrates a lead terminal of the magnetic detection element. Since the through hole is formed, the distance between the first and second drive control circuit boards in the axial direction can be reduced as compared with the conventional one, and the brushless motor with a built-in circuit board can be reduced in size. be able to.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

(overall structure)
FIG. 1 is a cross-sectional view of a pump device using a circuit board built-in brushless motor according to an embodiment of the present invention. FIG. 2 is a plan view showing a part of the stator portion of the brushless motor with a built-in circuit board shown in FIG. FIG. 3 is a plan view of a second drive control circuit board according to the embodiment of the present invention.

  The pump device 10 includes a circuit board built-in brushless motor (hereinafter referred to as “brushless motor”) 20 and a pump 50, and the brushless motor 20 and the pump 50 are surrounded by an outer housing 11 and a motor case 25. It is stored in the space.

  As shown in FIG. 1, the pump 50 includes a negative pressure chamber formed in the middle of a fluid passage 53 extending from the inlet 51 to the outlet 52, and the inlet 51 and outlet 52 of the pressure fluid (for example, liquid). 54 and a centrifugal fan 55 as an impeller that rotates in the negative pressure chamber 54.

  The centrifugal fan 55 rotates at a high speed with the rotation of the rotor portion 22 that constitutes a part of the brushless motor 20. When the fluid is sucked from the introduction port 51 with the negative pressure chamber 54 as a negative pressure, the centrifugal fan 55 is fluidized. The gas is discharged from the discharge port 52 via the path 53.

  Further, in the present embodiment, the rotor portion 22 constituting the brushless motor 20 is disposed in the negative pressure chamber 54.

(Structure of brushless motor with built-in circuit board)
The brushless motor 20 mainly includes a stator portion 21, a rotor portion 22, first and second drive control circuit boards 23 and 24 having a drive control circuit for driving and controlling the rotor portion 22, and a motor case 25. It is said.

  Further, in the present embodiment, as shown in FIG. 1, the inner housing 12 is provided between the outer housing 11 and the motor case 25.

  The inner housing 12 is disposed so as to close the open end of the substantially bottomed cylindrical motor case 25, and a stator chamber 26 is formed in the space between the inner housing 12 and the motor case 25.

  In the stator chamber 26, first and second drive control circuit boards 23 and 24 having a circuit for driving and controlling the rotor portion 22 of the brushless motor 20 are arranged to face each other with an interval in the axial direction.

  The rotor unit 22 includes a ceramic sleeve 27 as a radial bearing, a drive magnet 28, and a resin centrifugal fan (including an impeller and a diffuser) 55 interposed between the sleeve 27 and the drive magnet 28. ing.

  The sleeve 27 has a hollow cylindrical shape, and the drive magnet 28 is a cylindrical permanent magnet having N and S poles magnetized in the circumferential direction.

  In the present embodiment, the sleeve 27 and the drive magnet 28 are attached via a centrifugal fan 55 and are rotated integrally.

  The stator portion 21 includes a cylindrical fixed shaft 29, thrust bearings 30 and 31 disposed on both ends of the fixed shaft 29, a stator core 32 disposed to face the drive magnet 28, and a bobbin fitted to the stator core 32. (Or yoke) 33 and drive coil 34 wound around bobbin 33 are the main components. As a result, the sleeve 27 slides on the outer peripheral surface of the fixed shaft 29 in the radial direction, and rotates while sliding on one surface of the thrust bearings 30 and 31 in the thrust direction.

One end side (lower end side in FIG. 1) of the fixed shaft 29 is supported by the inner housing 12 via a thrust bearing 30, and the other end side (upper end side in FIG. 1) is supported by the outer housing 11 via a thrust bearing 31. ing.
At this time, the negative pressure in the negative pressure chamber 54 increases in proportion to the high-speed rotation of the centrifugal fan 55 and the rotor portion 22 is displaced toward the negative pressure chamber 54 along the axis of the fixed shaft 29. Since the thrust bearing 31 disposed on the pressure chamber 54 side is reliably prevented from rotating with respect to the outer housing 11, it can receive a thrust load stably.

The inner housing 12 is integrally formed with a bottomed cylindrical portion 12a positioned inside the stator chamber 26 and a flange portion 12b positioned at the open end edge of the bottomed cylindrical portion 12a. A pedestal portion 12d is formed in the center of the bottom wall of the bottomed cylindrical portion 12a. The pedestal portion 12d is formed coaxially with the fixed shaft 29 and has a shaft support hole 12c that supports one end of the fixed shaft 29. Further, a through hole 12e through which the mounting bolt 35 passes is formed in the flange portion 12b. The flange portion 12b is formed with an annular groove 12f into which an annular packing 36 for ensuring sealing with the outer housing 11 is inserted.
Further, the inner housing 12 is provided with a positioning pin 12b protruding to the opposite side to the bottomed cylindrical portion 12a. Similarly, a mounting leg portion 12g protruding on the opposite side of the bottomed cylindrical portion 12a is provided. The positioning pins 12b and the mounting legs 12g are formed with positioning steps on which the first drive control circuit board 23 is placed. By these positioning steps, the first drive control circuit board 23 and the second drive control circuit board 24 are arranged to face each other with a predetermined interval in the axial direction.

  The outer housing 11 has a pressure fluid (here, liquid) inlet 51 and outlet 52 formed at the center thereof. In addition, the outer housing 11 forms a fluid path 53 leading to the introduction port 51 and the discharge port 52 in cooperation with the inner housing 12 and forms a negative pressure chamber 54 in the middle thereof. Further, the outer housing 11 is formed with an insertion hole 11 e for the mounting bolt 35. The outer housing 11 is formed with a wall 11b that forms a fluid path 53. Furthermore, a shaft support hole 11 d having a substantially circular shape in plan view is formed in the leg portion 11 c extending toward the center of the outer housing 11. The center of the shaft support hole 11 d is formed coaxially with the introduction port 51.

  The stator core 32 is made of a ferromagnetic material, and as shown in FIG. 2, twelve salient poles 37 projecting toward the center are formed. Each salient pole 37 is fitted with a bobbin 33 around which a drive coil 34 is wound. In FIG. 2, the drive coil 34 is not shown.

  Further, each bobbin 33 is provided with two connecting terminals 38 extending in the axial direction, and the winding start terminal and the winding end terminal of the drive coil 34 wound around the bobbin 33 are respectively tangled. Yes.

  In this embodiment, the drive coil 34 wound around the stator core 32 is composed of three phases of U, V, and W phases, and a set of four drive coils 34U of U1, U2, U3, and U4 forms the U phase. , V1, V2, V3, and V4 constitute the V phase, and W1, W2, W3, and W4 constitute the W phase.

Specifically, as shown in FIG. 3, each set of windings wound around each salient pole is energized via four connections U1, U2, U3, U4 (shown by solid lines in FIG. 3). Thus, the magnetic poles generated in the windings wound around these salient poles 37 are wound in the same direction and connected so that the magnetic poles are the same. Similarly, connections V1, V2, V3, V4 (shown by broken lines in FIG. 3) and connections W1, W2, W3, W4 (shown by two-dot chain lines in FIG. 3) are wound in the same direction and connected. Yes. The three sets of winding groups of U, V, and W phases shown in FIG. 2 are connected to each other by Y connection on the second drive control circuit board 24 as shown in FIG.

  Four sets (three-phase) of winding groups of U, V, and W phases are connected to the second drive control circuit board 24, and a rotating magnetic field is generated by sequentially switching phases to be supplied to these winding groups. Then, the rotor part 22 is rotated. In order to detect the magnetic pole (rotation) position of the drive magnet 28, three magnetic detection elements 39, 39, 39 are arranged at intervals of about 30 °, and one energized phase is selected by the magnetic detection signal. As the magnetic detection element 39, a magnetoelectric conversion element such as a Hall element is used.

  Furthermore, in the present embodiment, each one connection terminal 38 corresponding to the U phase, the V phase, and the W phase passes through the second drive control circuit board 24 and reaches the first drive control circuit board 23. It has an extended length (see FIG. 1). These three connection terminals 38 are soldered and electrically connected to a conductive pattern formed on the first drive control circuit board 23 so that a current from a power source is supplied.

  The motor case 25 is made of a metal such as aluminum having a rust prevention property or a resin according to the purpose of use (use environment), and has a screw hole 25a that is screwed with the mounting bolt 35.

The pump 50 is generally called a canned pump, and a space surrounded by the motor case 25 and the inner housing 12 forms a stator chamber 26, and the stator chamber 26 has a stator portion 21 of the brushless motor 20. A stator core 32 constituting a part, a bobbin (or yoke) 33 fitted to the stator core 32, and a drive coil 34 wound around the bobbin 33 are arranged. A space surrounded by the inner housing 12 and the outer housing 11 on the opposite side separated by the stator chamber 26 and the outer housing 11 is a rotor portion 22 of the brushless motor 20 and a pump 50 connected to the rotor portion 22. 27, a drive magnet 28 and a resin centrifugal fan (including an impeller and a diffuser) 55 are disposed.
(About the first and second drive control circuit boards)
Next, a drive control circuit board according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the first and second drive control circuit boards 23 and 24 are disposed in the stator chamber 26 so as to face each other with an interval in the axial direction, while the mounting legs 12 g of the inner housing 12. Are fixed by screws 40.

  The first drive control circuit board 23 has a drive control circuit (for example, a drive IC) for driving and controlling the rotor portion 22, a conductive pattern electrically connected to the lead terminal 41 of the magnetic detection element 39, and a bobbin 33. A conductive pattern for electrically connecting the formed connection terminals 38 is formed. Further, as shown in FIG. 3, a power connector 42 that receives power from the power source is provided.

  Furthermore, in the present embodiment, the first drive control circuit board 23 is penetrated by the lead terminals 41 (see FIG. 1) of the three magnetic detection elements 39 that detect the magnetic pole (rotation) position of the drive magnet 28. A through hole 23 b is formed through the hole 23 a and the connection terminal 38 formed in the bobbin 33.

  In the present embodiment, three through holes 23b are formed as shown in FIG. 3, and each through hole 23b has a U phase, a V phase, and a W phase as shown in FIG. Each corresponding one connection terminal 38 penetrates.

  Further, as shown in FIG. 1, the first drive control circuit board 23 has a fitting hole 23c into which a positioning pin 12b protruding from the bottomed cylindrical portion 12a provided in the inner housing 12 is fitted. A mounting leg portion 12 c protruding from the center of the bottomed cylindrical portion 12 a passes therethrough, and a through hole 23 d that is screwed by a screw 40 is formed. Thus, the first drive control circuit board 23 is fixed in a state where the stator core 32 and the magnetic detection element 39 provided in the inner housing 12 are positioned.

  As shown in FIG. 3, the second drive control circuit board 24 has three phases of U phase, V phase, and W phase, and Y connection patterns U1 to U4 (shown by solid lines in FIG. 3), V1 to V4 (indicated by a broken line in FIG. 3) and W1 to W4 (indicated by a two-dot chain line in FIG. 3) are printed. Furthermore, a through hole 24a is formed through which lead terminals 41 (see FIG. 1) of three magnetic detection elements 39 for detecting the magnetic pole (rotation) position of the drive magnet 28 pass.

  In the present embodiment, the second drive control circuit board 24 is formed with three through holes 24b as shown in FIG. As shown in FIG. 1, one through-hole terminal 38 corresponding to each of the U phase, the V phase, and the W phase passes through the through holes 24b.

  As shown in FIG. 1, the second drive control circuit board 24 is placed on the bottom surface of the inner housing 12 and the end surface of the bobbin 33, and penetrates the positioning pins 12 b and the mounting legs 12 c formed on the inner housing 12. Has been. As a result, the second drive control circuit board 24 is fixed in a state where the stator core 32 and the magnetic detection element 39 provided in the inner housing 12 are positioned.

  In addition, the through hole 24a is formed with a hole that does not come into contact with other electronic components. In a state where the through hole 24a is fixed while being positioned, the lead terminal 41 of the magnetic detection element 39 is connected to the through hole 24a. It does not touch the end face.

  Further, a plurality of three magnetic detection elements 39 are arranged between adjacent drive coils 34 that are U-phase, V-phase, and W-phase, and through holes 24a through which the lead terminals 41 of these magnetic detection elements 39 pass are circular. One arc is formed.

  Further, as shown in FIG. 3, the second drive control circuit board 24 has a through hole 24c through which a positioning pin 12b protruding from the bottomed cylindrical portion 12a formed in the inner housing 12 passes, and a bottomed cylinder. A through hole 24d through which the mounting leg portion 12c protruding from the center of the portion 12a passes and a screw mounting hole 12e for fixing the second drive control circuit board 24 to the inner housing 12 (or the stator core 32) are formed. ing.

(Manufacturing method of circuit board built-in brushless motor)
A method for manufacturing the brushless motor 20 configured as described above will be described below.

  The rotor portion 22 is assembled by integrally attaching the sleeve 27, the drive magnet 28, and the centrifugal fan 55.

  The stator core set is fitted with a bobbin 33 around which a drive coil 34 is wound around each salient pole 37 of the stator core 32. The stator core set is positioned and fixed to the outer peripheral surface of the inner housing 12 in the axial direction.

  On the inner peripheral side of the inner housing 12, a fixed shaft 29 is inserted into a shaft support hole 12c formed in the pedestal portion 12d. The thrust bearing 30 is fitted in the shaft support hole 12c while being prevented from rotating.

  The rotor portion 22 is attached to the fixed shaft 29. Specifically, the fixed shaft 29 passes through the hollow of the sleeve 27. After the penetration, the outer housing 11 to which the thrust bearing 31 is attached is inserted into the fixed shaft 29.

  Thereafter, in the stator core set attached to the inner housing 12, the magnetic detection elements 39, 39, 39 are fixed to three predetermined locations of the bobbin 33.

  The second drive control circuit board 24 is fitted to the positioning pins 12b and the mounting legs 12g formed on the inner housing 12. At this time, the lead terminal 41 of the magnetic detection element 39 formed on the second drive control circuit board 24 passes through the through hole 24a, and similarly, the connection terminal 38 formed on the bobbin 33 is soldered to the conductive pattern. Are electrically connected.

  Next, the first drive control circuit board 23 is attached by the screw 40 in a state where it is placed on the positioning step formed on the positioning pin 12b and the mounting leg 12g.

  In a state where the first drive control circuit board 23 is attached, the lead terminal 41 of the magnetic detection element 39 penetrates the through hole 23a, is soldered, and is electrically connected.

  In this embodiment, each one connection terminal 38 corresponding to each of the U phase, the V phase, and the W phase extends to the first drive control circuit board 23, and these three connection terminals 38 are The first drive control circuit board 23 is soldered and electrically connected.

  Thereafter, the motor case 25 is fixed by the outer housing 11 and the screw 35 so as to sandwich the inner housing 12.

  In the pump device 10 described above, the rotor portion 22 rotates in a predetermined rotation direction according to Fleming's left-hand rule by the magnetic force of the drive magnet 28 of the brushless motor 20 and the current flowing in the drive coil 34. As a result, the centrifugal fan 55 rotates at a high speed as the rotor portion 22 rotates, and as a result, the fluid path 53 is sucked in from the introduction port 51 with a negative pressure in the fluid path 53. It discharges from the discharge port 52.

(Main effects of this embodiment)
As described above, the circuit board built-in type brushless motor 20 has the first and second drive control circuit boards 23 and 24 disposed in the motor case 25 so as to face each other with an interval in the axial direction. The second drive control circuit board 24 is formed with through holes 24 a that penetrate the lead terminals 41 of the three magnetic detection elements 39. As a result, the distance between the first and second drive control circuit boards 23 and 24 in the axial direction can be reduced as compared with the prior art, and the circuit board built-in brushless motor 20 can be downsized.

  Further, the brushless motor 20 with a built-in circuit is provided with a circuit for controlling the driving of the rotor portion 22 on the first drive control circuit board 23, and is wound around the stator core 32 on the second drive control circuit board 24. A circuit for controlling power supply to the drive coil 34 is provided, and the drive magnet 28, the second drive control circuit board 24, and the first drive control circuit board 23 are arranged in the axial direction in this order, and the through hole 24a is formed in the second hole 24a. The drive control circuit board 24 is formed. Thereby, the lead terminal 41 of the magnetic detection element 39 can be directly electrically connected to the first drive control circuit board 23. Therefore, noise can be prevented from appearing in the output signal of the magnetic detection element 39.

In the circuit board built-in brushless motor 20, when the first and second drive control circuit boards 23 and 24 are arranged to face each other in a separated state, an output signal from a power supply destination or a sensor is received. The lead terminals 41 of the three magnetic detection elements 39 and the connection terminals 38 formed on the bobbin 33 are passed through the passage holes 24a and 24b provided in the second drive control circuit board 24 to perform the first drive. Since it is directly connected to the control circuit board 23, a dedicated connection member such as the magnetic detection element connectors 118 and 118 and the magnetic detection element signal cable 119 for electrically connecting the circuit boards 23 and 24 is provided as in the prior art. It can be unnecessary. Further, it is not necessary to secure a clearance for arranging the magnetic detection element connectors 118 and 118 and the magnetic detection element signal cable 119, and the overall size of the brushless motor 20 with a built-in circuit can be reduced.
Further, since it is not necessary to use a dedicated connection member, it is possible to reduce the component cost.

  In the circuit board built-in type brushless motor 20, the lead terminals 41 of the three magnetic detection elements 39 are passed through the through holes 24 a provided in the second drive control circuit board 24 to the first drive control circuit board 23. Since it is directly connected, the conventional magnetic detection element signal cable 119 connected between the magnetic detection element connectors 118 and 118 is used. Therefore, the magnetic detection element signal cable 119 is routed to prevent contact with other electronic components. There is no problem of having to do so, and the assembly process becomes easy.

  Further, expensive connection parts such as the magnetic pole detection element connectors 118 and 118 and the magnetic pole detection element signal cable 119 are not required, and the cost is reduced.

  Further, in the circuit board built-in type brushless motor 50, the first drive control circuit passes through the lead terminals 41 of the three magnetic detection elements 39 through the through holes 24a provided in the second drive control circuit board 24. Since it is directly connected to the substrate 23, it is possible to prevent noise from appearing on the output signal of the magnetic detection element 39.

  In addition, a plurality of the magnetic detection elements 39 are arranged so as to face the adjacent drive coils 34, and one through hole 24a through which the lead terminals 41 of the plurality of magnetic detection elements 39 pass is formed. The processing time for forming 24a is shortened and can be manufactured at low cost.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the gist of the present invention.

  For example, in the present embodiment described above, the brushless motor with a built-in circuit board is applied to the pump device. However, for example, the brushless motor is applied to a finished product such as an electric blower or a ventilation fan of a vacuum cleaner or a motor alone. Of course you can.

  Further, the number of through holes 24a formed in the second drive control circuit board 24 is one, but the present invention is not limited to this. The through holes 24a are formed in each of the three magnetic detection elements 39, 39, 39. May be formed.

  Further, the winding method of the drive coil 34 in the present embodiment is not limited, and other winding methods may be used. Thereby, arrangement | positioning of the magnetic detection element 39 is also changed, and the position of the through-hole 24a may be changed according to it.

  Similarly, the present invention is not limited to the through holes 24b formed in the second drive control circuit board 24 or the through holes 23a and 23b formed in the first drive control circuit board 23, and may be changed according to the design. May be.

It is sectional drawing of the pump using the circuit board built-in type brushless motor which concerns on embodiment of this invention. It is a top view which shows a part of stator part of the brushless motor with a built-in circuit board shown in FIG. It is a top view of the 2nd drive control circuit board concerning an embodiment of the invention. It is sectional drawing of the pump using the conventional brushless motor with a built-in circuit board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pump apparatus 20 ... Brushless motor with a built-in circuit board 21 ... Stator part 22 ... Rotor part 23 ... First drive control circuit board 23a, 23b ... Through-hole 24 ... Second drive control circuit board 24a ... Through-hole 25 ... Motor case 28 ... Driving magnet 32 ... Stator core 38 ... Connection terminal formed on bobbin 39 ... Magnetic detection element 41 ... Lead terminal of magnetic detection element

Claims (4)

A rotor portion having a drive magnet, a stator portion having a stator core disposed so as to face the outer periphery of the drive magnet, a magnetic detection element for detecting a magnetic pole position of the drive magnet, and a drive control for driving the rotor portion First and second drive control circuit boards having a circuit, and a motor case to which the stator core is fixed, and the first drive control circuit board and the second drive control circuit inside the motor case A circuit board built-in type brushless motor, which is disposed so as to face the substrate in the axial direction with an interval,
The first drive control circuit board is provided with a circuit for controlling driving of the rotor portion, and the second drive control circuit board is provided with a circuit for controlling power feeding to a drive coil wound around the stator core. And provided in the axial direction in the order of the drive magnet, the second drive control circuit board, the first drive control circuit board,
Wherein said second drive control circuit board, the through-holes lead terminals of the magnetic detecting element penetrates is formed, the lead terminals of the magnetic detecting element formed on the second drive control circuit board A brushless motor with a built-in circuit board, wherein the brushless motor is connected to the first drive control circuit board through a through hole . 2. The circuit board according to claim 1, wherein a plurality of the magnetic detection elements are arranged between adjacent drive coils, and one through hole through which the lead terminals of the plurality of magnetic detection elements penetrate is formed. Built-in brushless motor. The brushless motor with a built-in circuit board according to claim 2, wherein the through hole is formed in an arc shape. The motor case has a bottomed cylindrical shape, and includes an inner housing disposed so as to close an open end of the motor case, and the inner housing has a bottomed cylindrical bottomed cylindrical portion, A positioning pin projecting to the opposite side of the bottom cylindrical portion and a mounting leg, and a positioning step on which the first drive control circuit board is placed is formed on the positioning pin and the mounting leg; 2. The positioning step portion causes the first drive control circuit board and the second drive control circuit board to be opposed to each other with a predetermined interval in the axial direction. The circuit board built-in brushless motor described.

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