JPWO2008018202A1 - Pump and pump system - Google Patents

Abstract

An impeller (11) having a plurality of blades (111) formed on the outer periphery and a rotor magnet (112) provided on the inner periphery, a motor stator 12 disposed facing the rotor magnet (112), and an impeller (11) and the motor stator (12), and a pump casing (13) in which a recess (133) for accommodating the motor stator (12) is formed, and a drive IC (41) for supplying current to the motor stator (12) ) Mounted on the electronic board (15), and the electronic board 15 is arranged so that the mounted driving IC (41) faces the motor stator (12), and the pump casing ( 13).

Description

  The present invention relates to a pump and a pump system, and more particularly, to a pump and a pump system used for circulating a refrigerant for cooling an electronic component, a fuel circulation for a fuel cell, and the like.

  In recent years, with the improvement in performance and functionality of information equipment, the heat generation of electronic components inside the information equipment has increased, and the importance of cooling devices has increased. For example, the clock frequency of the CPU is much larger than before, and for this reason, a system for cooling an LSI or the like by circulating a refrigerant inside has been put into practical use. On the other hand, in recent years, the development of fuel cells has progressed rapidly. This fuel cell is a cell that circulates fuel and extracts electricity, but it tends to become increasingly smaller and is increasingly built in information processing terminals such as notebook personal computers and PDAs.

  By the way, in order to circulate such refrigerant and fuel, a miniaturized pump is often used. By incorporating the miniaturized pump into the information device, circulation of the refrigerant and fuel inside the information device has been realized (for example, see Patent Document 1).

  The thin eddy current pump disclosed in Patent Document 1 incorporates a rotor magnet or the like in a space formed by a pump casing and a cover. A stator is disposed outside the space formed by the pump casing and the cover so as to face the magnet. When a current is passed through the stator in such a configuration, the blades provided integrally with the rotor magnet rotate due to electromagnetic interaction between the stator and the rotor magnet, and the refrigerant and fuel can be circulated.

  Here, although not disclosed in Patent Document 1, generally, a flexible tape or a lead wire is drawn from the pump in order to supply current to the stator described above. The drawn flexible tape and lead wire are connected to a processing circuit (such as a driving IC) existing at a position away from the pump on the electronic substrate via a connector.

Japanese Patent Laying-Open No. 2003-161284 (FIG. 1)

  However, if the processing circuit including the driving IC and the pump are located at a distant position, the area of the electronic board increases accordingly, which satisfies the requirements for downsizing of information equipment and high-density mounting of various electronic components. I can't.

  In addition, in the conventional method in which a flexible tape or lead wire is pulled out from the pump, a minute output signal necessary for motor control is also transmitted using the flexible tape or lead wire, so that the electric signal flowing through them is electronic. Noise may be generated on the substrate. In this case, there is a risk that various electronic components may malfunction or fail.

  Further, in order to detect the number of rotations of the rotor, for example, a case is considered in which a detection magnet is attached to the rotor separately from the rotor magnet, and the detection magnet is detected from outside the pump. In this case, since the Hall element that performs magnetic detection is disposed outside the pump, care must be taken to prevent mounting displacement (the Hall element from being displaced from the desired position). If the mounting displacement occurs, the magnetic detection is hindered and the motor malfunctions.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a pump and a pump system that improve mounting efficiency so as to satisfy downsizing requirements for information equipment and high density mounting requirements for various electronic components. Is to provide.

  In order to solve the above problems, the present invention provides the following.

  (1) An impeller in which a plurality of blades are formed on the outer periphery and a rotor magnet is provided on the inner periphery, a motor stator disposed to face the rotor magnet, the impeller and the motor stator are partitioned, A pump having a pump casing in which a recess for accommodating the motor stator is formed, and an electronic board on which a driving IC for supplying current to the motor stator is mounted, wherein the electronic board is mounted on the drive An IC is disposed so as to face the motor stator, and is fixed to the pump casing.

  According to the present invention, an impeller having a rotor magnet provided on the inner periphery, a motor stator disposed to face the rotor magnet, a pump casing that partitions the impeller and the motor stator, and a drive IC are mounted. A motor stator is housed in a recess formed in a pump casing, and the electronic substrate is disposed so that the mounted driving IC faces the stator core, Since it is being fixed to the pump casing, the said recessed part can be utilized. Therefore, the mounting efficiency can be improved so as to satisfy the demand for downsizing of information equipment and the demand for high-density mounting of various electronic components.

  (2) The pump according to claim 1, wherein an outer peripheral end portion of the electronic substrate is fixed to the pump casing so as to cover the concave portion.

  According to the present invention, the outer peripheral end of the electronic board is fixed to the pump casing, and as a result, the recess is covered with the electronic board. High density mounting of electronic components can be realized.

  In other words, fixing the outer peripheral end of the electronic board to the pump casing results in the integration of the processing circuit including the drive IC and the pump, and the flexible tape and lead wires are pulled out from the pump as in the past. Even if not, current can be supplied to the motor stator. Therefore, mounting efficiency is improved, and downsizing (thinning) of information equipment and high-density mounting (or optimal arrangement) of various electronic components can be realized.

  Further, according to the present invention, it is not necessary to pull out the flexible tape or the lead wire from the pump, so that no noise is generated on the electronic substrate, and the malfunction or failure of the electronic component can be prevented.

  Moreover, by fixing the outer peripheral end portion of the electronic substrate to the pump casing, it is possible to prevent water from entering the concave portion from the gap between the electronic substrate and the pump casing, and to improve waterproofness. In addition, not only water but also foreign matters such as dust and dust can be prevented from entering the recess, and as a result, dust resistance can be improved. Further, for example, by mounting a magnetic detection means for detecting the magnetic force of the rotor magnet on the concave side of the electronic substrate, it is possible to prevent the magnetic detection means from being displaced.

  Furthermore, in this invention, generation | occurrence | production of abnormal noise can also be prevented by fixing the outer peripheral edge part of an electronic board | substrate to a pump casing. More specifically, when the outer peripheral end portion of the electronic board is not fixed to the pump casing, the outer peripheral end portion becomes a free end, and therefore vibration is generated by the high-speed rotation of the impeller. The possibility of vibration noise) cannot be denied. However, when the outer peripheral end portion of the electronic substrate is fixed to the pump casing as in the present invention, the outer peripheral end portion is a fixed end, so that even if the impeller rotates at high speed, vibration hardly occurs. . As a result, the generation of abnormal noise can be prevented.

  Here, the electronic substrate “covers the recess” includes not only the case where the space in which the motor stator is accommodated is covered so as to be a sealed space, but also the case where the recess is simply covered so that the motor stator is hidden. And Therefore, the space in which the motor stator is accommodated may not be a sealed space, for example, when a groove for passing the wiring of the electronic board is provided in a part of the pump casing.

  Moreover, although the outer peripheral edge part of the electronic board is being fixed to the pump casing, this does not exclude the other part of the electronic board being fixed to the pump casing. Therefore, for example, the outer peripheral end portion and the vicinity of the center of the electronic substrate may be fixed to the pump casing. The “outer peripheral end” may be the outer peripheral end surface of the electronic substrate, or may be the front surface or the rear surface in the vicinity of the outer periphery of the electronic substrate, and the specific location is not limited.

  Furthermore, when “fixing” the outer peripheral end of the electronic board to the pump casing, it may be fixed by fitting, may be fixed by engaging, or may be fixed by simply contacting. Also good. Note that a medium such as an adhesive may be used for “fixing”.

  (3) The pump further includes magnetic detection means for performing magnetic detection of the rotor magnet, and the magnetic detection means is attached to the concave side of the electronic substrate and in the vicinity of the outer peripheral end. To pump.

  According to the present invention, the above-described pump is provided with magnetic detection means for performing magnetic detection of the rotor magnet, and this magnetic detection means is attached to the concave side of the electronic substrate and in the vicinity of the outer peripheral end, so that it is close to the rotor magnet. Thus, the SN ratio at the time of magnetic detection can be improved, and as a result, noise can be suppressed and detection accuracy can be improved.

  (4) A pump characterized in that a lead wire connecting the magnetic detection means and the driving IC is wired on the electronic substrate.

  According to the present invention, since the lead wire connecting the magnetic detection means and the driving IC described above is wired on the electronic substrate, electromagnetic noise can be suppressed as compared with the case where the lead wire is not on the electronic substrate, As a result, detection accuracy can be improved.

  (5) The pump characterized in that a groove for passing the wiring of the electronic board is formed in the pump casing.

  According to the present invention, since the groove for passing the wiring of the electronic substrate is formed in the above-described pump casing, without hindering the thinning of the pump and without complicating the structure of the pump, Power supply and signal transmission to the electronic board can be performed.

  (6) The pump characterized in that the driving system of the pump by the driving IC is a three-phase driving system.

  According to the present invention, the pump driving method using the above-described driving IC is a three-phase driving method, so that the rotation is smoother than that of the two-phase driving method, and the rotation efficiency can be increased.

  (7) A pump system comprising: the pump according to any one of (1) to (6); and a control circuit that transmits a control signal for changing the rotational speed of the impeller to the pump, The pump includes an FG terminal that outputs an FG signal that periodically changes according to the rotation speed of the impeller, and the control circuit transmits the control signal based on the FG signal received from the FG terminal. The pump system characterized by

  According to the present invention, a pump system having the above-described pump and a control circuit that transmits a control signal for changing the rotational speed of the impeller to the pump, the pump according to the rotational speed of the impeller. An FG terminal that outputs an FG signal that changes periodically is provided, and a control signal is transmitted by the control circuit based on the FG signal received from the FG terminal. At the same time, the pump performance (discharge amount) can be appropriately controlled.

  According to the present invention, an impeller having a rotor magnet provided on the inner periphery, a motor stator disposed to face the rotor magnet, a pump casing that partitions the impeller and the motor stator, and a drive IC are mounted. The motor stator is housed in a recess formed in a pump casing, and the electronic board is disposed so that the mounted drive IC faces the motor stator. Since it is fixed to the pump casing, the recess can be utilized. Therefore, the mounting efficiency can be improved so as to meet the requirements for downsizing of information equipment and high-density mounting of various electronic components.

It is a figure which shows the mechanical structure of the pump which concerns on embodiment of this invention. It is the schematic which shows the external appearance structure of a motor stator. It is a block diagram which shows the electric structure of the pump which concerns on embodiment of this invention. It is a circuit diagram which shows the electric circuit of the pump which concerns on embodiment of this invention. It is a figure showing an outline of a pump system concerning an embodiment of the invention. It is explanatory drawing for demonstrating the pump which concerns on other embodiment of this invention. It is explanatory drawing for demonstrating the pump which concerns on other embodiment of this invention.

Explanation of symbols

Reference Signs List 1 pump 11 impeller 111 blade 112 rotor magnet 113 shaft 114 yoke 12 stator 121 salient pole portion 122 tip portion 123 coil 13 pump casing 131 convex portion (mounting portion)
14 bottom plate 15 electronic board 15a insertion hole 152 outer peripheral end 16 drive IC
22 Pump chamber 30 Ball bearing 41 Drive IC
42 Hall element

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

[Mechanical structure]
FIG. 1 is a diagram showing a mechanical structure of a pump 1 according to an embodiment of the present invention. In particular, FIG. 1A shows a side sectional view of the pump 1, and FIG. 1B shows a plan view when the pump 1 is viewed from the bottom plate 14 side. FIG. These show the top view when the pump 1 is seen from the electronic board | substrate 15 side, FIG.1 (d) has shown the side view when the pump 1 is seen from the suction inlet (or discharge port) 31. . Moreover, Fig.1 (a) is a sectional side view when cut | disconnecting by the AA surface of FIG.1 (b).

  In FIG. 1A, the pump 1 mainly includes an impeller 11, a motor stator 12, a pump casing 13, and a bottom plate 14.

  The impeller 11 is a disk-shaped rotating body, and a plurality of blades 111 having a ring shape are formed on the outer periphery of a disk-shaped yoke 114. In the present embodiment, the disk-shaped yoke 114 is made of a magnetic material such as an SK material. The blades 111 are made of a heat-resistant plastic material such as PPS (polyphenylene sulfide), for example, and are fixed to the outer periphery of the disk-shaped yoke 114 with an adhesive or the like. The rotation of the disk-shaped yoke 114 (the impeller 11) causes turbulence around the blades 111. In addition, by applying a water repellent process to the surface of the blade 111, the initial rotation can be made smooth.

  On the other hand, a rotor magnet 112 is attached to the inner periphery of the impeller 11. The rotor magnet 112 is a ring-shaped member attached to the inner peripheral wall surface of the yoke 114 with an adhesive or the like, and for example, a permanent magnet such as a neody bond magnet is used. A rotational force is generated in the rotor magnet 112 in accordance with the magnetic field generated by the motor stator 12, and the rotor magnet 112 and the impeller 11 rotate together. In the present embodiment, an outer rotor type motor structure in which a rotor magnet 112 positioned outside the motor stator 12 rotates.

  The impeller 11 is fixed to a shaft 113, and the shaft 113 is rotatably supported by the ball bearing 30. As the bearing member, a dynamic pressure bearing capable of supporting higher speed rotation can be adopted, but by using the ball bearing 30 as in the present embodiment, the impeller 11 rotates while swinging up and down. As a result, it is possible to prevent the generation of abnormal noise due to a collision and the decrease in rotational efficiency.

  The motor stator 12 has a plurality of salient pole portions 121 that are arranged to face the rotor magnet 112 with a predetermined gap and extend radially outward of the impeller 11. The appearance configuration is as shown in FIG. FIG. 2 is a schematic diagram showing an external configuration of the motor stator 12.

  As shown in FIG. 2A, the motor stator 12 has nine salient pole portions 121 extending radially outward in the radial direction of the impeller 11, and the tip portion 122 is a rotor magnet. 112 is arranged opposite to 112. In FIG. 2A, illustration of a coil wound around the salient pole part 121 is omitted. Further, in FIG. 2A, nine poles 121 are employed, but for example, as shown in FIG. 2B, six salient poles 121 are employed, and each salient pole 121 is provided. The coil 123 may be wound so that the tip 122 of each salient pole 121 is opposed to the rotor magnet 112. A magnetic field can be generated in the vicinity of the motor stator 12 by passing a current through the coil 123 wound around the salient pole portion 121. In addition, about the form of the motor stator 12, you may be forms other than FIG. 2 (a) and FIG.2 (b).

  In FIG. 1 again, the pump casing 13 includes an inner space 23 formed by a rotor region 21 where the impeller 11 is present, a pump chamber 22 in which a liquid such as refrigerant or fuel circulates, and a recess 133 in which the motor stator 12 is accommodated. And liquid such as a refrigerant or fuel is prevented from adhering to the motor stator 12 and preventing the motor stator 12 from malfunctioning. That is, the impeller 11 and the motor stator 12 are spatially partitioned by the pump casing 13.

  The pump chamber 22 is a region in which a liquid such as a refrigerant or fuel that flows in from one of the suction ports (or discharge ports) 31 and flows out from the other circulates due to turbulent flow. The pump chamber 22 is formed by fixing the pump casing 13 and the bottom plate 14 together. The pump chamber 22 is formed with a wide width so as to surround the periphery of the blade 111, and its cross section is formed with a size that widely surrounds the outside of the blade 111.

  The pump casing 13 is preferably a synthetic resin (such as a heat-resistant plastic) from the viewpoint of weight reduction, but other metal materials such as copper and aluminum (or aluminum alloy) may be used. Further, by providing an O-ring between the pump casing 13 and the bottom plate 14, it is possible to ensure the sealing between the members. Moreover, about the fixing method of the pump casing 13 and the baseplate 14, a volt | bolt | nut and a nut can be used or an adhesive agent can be used.

  As described above, the pump casing 13 has the recess 133 that accommodates the motor stator 12, and the motor stator 12 is incorporated therein. Further, in the pump casing 13, a mounting portion for fixing the electronic substrate 15 while positioning is formed near the center of the motor stator 12 formed in an annular shape as shown in FIG. That is, the Hall element 42 can be positioned so that the magnetic detection of the rotor magnet 112 can be performed by mounting the electronic substrate 15 on the mounting portion. In the present embodiment, the mounting portion is formed with a plurality of convex portions 131.

  An electronic substrate 15 on which a driving IC 41 that supplies current to the motor stator 12 is mounted is fixed to the most advanced portion of the convex portion 131. More specifically, an insertion hole 15a into which the convex portion 131 of the pump casing 13 can be inserted is formed in the center of the electronic substrate 15, and when the convex portion 131 is inserted into the insertion hole 15a, the electronic substrate 15 The outer peripheral end 152 of the pump contacts the pump casing 13. In this way, the electronic board 15 covers the recess 133 (internal space 23 formed by) in which the motor stator 12 is accommodated, and in the present embodiment, the outer peripheral end 152 is a pump casing. 13 is fixed. More specifically, an adhesive is applied (filled) between the outer peripheral end portion 152 and the pump casing 13 to enhance the sealing performance and prevent liquid such as water from entering the recess 133. . The electronic substrate 15 has a disk shape, and the area thereof is smaller than the area of the bottom plate 14 of the pump 1 (see FIGS. 1B and 1C).

On the surface of the electronic substrate 15 (on the concave 133 side of the pump casing 13), a Hall element 42 that performs magnetic detection of the rotor magnet 112 is disposed. Specifically, as shown in FIG. 1A, a hall element 42 is provided through a predetermined gap in the axial direction from the rotor magnet 112. Note that the predetermined gap is formed with a plurality of convex portions (mounting portions) 131 formed in the pump casing 13 for fixing the electronic substrate while positioning.
Further, in the present embodiment, as shown in FIG. 1, the Hall element 42 is attached in the vicinity of the outer peripheral end 152 of the electronic substrate 15 from the position of the rotor magnet 112. Therefore, since it arrange | positions in the vicinity of the rotor magnet 112, the SN ratio in the case of a magnetic detection can be improved. The wiring of the electronic board 15, specifically, the line for supplying power is passed through a groove 134 formed in the pump casing 13 (see FIG. 1C). The size of the groove 134 may be as long as the wiring of the electronic substrate 15 passes.

  In the present embodiment, the electronic board 15 is arranged so that the mounted drive IC 41 faces the motor stator 12 and is fixed to the pump casing 13. That is, the surface of the electronic substrate 15 faces the motor stator 12. As a result, the drive IC 41 and the like mounted on the electronic substrate 15 are not exposed to the outside, so that damage to the electronic components such as the drive IC 41 can be prevented.

  Next, the electrical configuration of the pump 1 will be described in detail.

[Circuit configuration]
FIG. 3 is a configuration diagram showing an electrical configuration of the pump 1 according to the embodiment of the present invention. FIG. 4 is a circuit diagram showing an electric circuit of the pump 1 according to the embodiment of the present invention. 3A is a schematic view of the electronic substrate 15 shown in FIG. 1A when viewed from the concave 133 side of the pump casing 13, and FIG. It is the schematic when the electronic substrate 15 shown to) is seen from the outside. Further, the surface shown in FIG. 3B may not be visible from the outside by a plastic cover or the like.

  In FIG. 3, the electric circuit of the pump 1 mainly includes a drive IC 41 for supplying current to the motor stator 12 and three Hall elements 42 for detecting the position of the rotor magnet 112 (in order of U phase, V phase, and W phase). 42a, 42b and 42c), three sets of FET sets 43a to 43c, and a Hall IC 45 for generating a frequency generator signal (FG signal).

  Terminals 44 a to 44 c are terminals for supplying current to the U-phase coil, V-phase coil, and W-phase coil of the motor stator 12, respectively, and the terminal 46 receives a control signal sent to the pump 1. The terminal 47 is an FG terminal that outputs an FG signal that periodically changes according to the rotation speed of the impeller 11 by the Hall IC 45. The terminal 48 is a power supply terminal (Vcc terminal), and the terminal 49 is a ground terminal (GND terminal).

  In FIG. 4, Hall elements 42a to 42c, which are magnetoelectric conversion elements utilizing the Hall effect, are connected to the drive IC 41, and the drive IC 41 receives the electrical signals from these Hall elements 42a to 42c, thereby generating blades. The rotation state of the car 11 can be recognized. In addition, three sets of FET sets 43a to 43c are connected to the drive IC 41, and each FET set is constituted by two FETs. The drive IC 41 supplies an appropriate current to the motor stator 12 through these FET sets 43a to 43c. The drive IC 41, the Hall elements 42a to 42c, the FET sets 43a to 43c, and the like can be supplied with 5V power through the power supply terminal 48. The Hall element 42 includes a type using InSb, a type using GaAs, and the like.

  On the other hand, a Hall IC 45 is connected to the drive IC 41, and an FG signal can be extracted from the FG terminal 47 through the Hall IC 45. The FG signal is generated in the driving IC 41 based on, for example, electrical signals received from the hall elements 42a to 42c. The drive IC 41 is connected to a PWM terminal 46. This PWM terminal 46 is a PWM (Pulse Width Modulation) signal from the control circuit 100 (see FIG. 5 to be described later), that is, the impeller 11. A terminal for receiving a control signal for changing the rotation speed. The drive IC 41 of the pump 1 is PWM controlled via this PWM terminal 46. Note that PWM control is a method of controlling supply power by changing the width ratio (so-called duty ratio) of voltage pulses.

  FIG. 5 is a diagram showing an outline of the pump system according to the embodiment of the present invention. This pump system mainly includes an impeller 11 that actually circulates refrigerant and fuel, a motor stator 12 that electromagnetically applies a rotational force to the impeller 11, and a drive IC 41 that supplies current to the coils of the motor stator 12. Is mounted on the electronic board 15 and a control circuit 100 that transmits a control signal to the electronic board 15. The operation of this pump system will be described with reference to FIGS.

  First, the control circuit 100 transmits a control signal for starting rotation of the impeller 11 to the drive IC 41. This control signal is received at the PWM terminal 46 of the drive IC 41. Thereafter, current is supplied from the drive IC 41 to the motor stator 12. Then, a magnetic field is generated at the front end portion 122 of the motor stator 12, and in response to the magnetic field, a repulsive force is generated in the rotor magnet 112, and the impeller 11 to which the rotor magnet 112 is attached is rotated by the repulsive force. start. When the impeller 11 rotates in the pump chamber 22, a turbulent flow is caused and refrigerant and fuel circulate inside the pump chamber 22. In this manner, the refrigerant and fuel that have flowed from the suction port are discharged from the discharge port to the outside through the pump chamber 22.

  Here, for example, consider increasing the rotational speed of the impeller 11. The control circuit 100 receives the FG signal output from the FG terminal 47 of the drive IC 41 as described above, and generates a desired PWM signal (a signal with a larger duty ratio) based on the FG signal. Then, the control circuit 100 transmits the generated PWM signal to the PWM terminal 46 of the drive IC 41. The drive IC 41 that has received the PWM signal through the PWM terminal 46 increases the amount of current supplied to the coil of the motor stator 12 based on this. Thereby, the rotation speed of the impeller 11 increases. The same applies when the rotational speed of the impeller 11 is decreased. That is, a PWM signal with a reduced duty ratio may be transmitted from the control circuit 100 to the drive IC 41 to reduce the rotational speed of the impeller 11.

  In the present embodiment, the three-phase driving method is adopted as the driving method of the pump 1 from the viewpoint of rotational efficiency. However, it is needless to say that a single-phase driving method or a two-phase driving method may be used. . In the present embodiment, nine salient pole portions 121 shown in FIG. 2A are used as the motor stator 12 (the coil is omitted in FIG. 2A), for example, as shown in FIG. 2B. By using the six salient pole portions 121 as described above, the gaps between the salient pole portions 121 are widened. Using this gap, the electronic substrate 15 may be fixed to the pump casing 13 with the drive IC 41 interposed between the plurality of salient pole portions 121. As a result, the axial thickness of the impeller 11 in the pump 1 can be reduced, and as a result, the pump 1 as a whole can be made thinner.

[Effect of the embodiment]
As described above, according to the pump system according to the present embodiment (FIG. 5), the rotational speed of the pump 1 (the impeller 11) is properly grasped on the control circuit 100 side by the FG signal, and at the same time, by the PWM signal. The pump performance (discharge amount) can be appropriately controlled.

  According to the pump 1 according to the present embodiment (FIGS. 1 to 4), the electronic substrate 15 is disposed so that the mounted drive IC 41, Hall element 45, and the like face the motor stator 12, and the electronic substrate 15. Since the outer peripheral end portion 152 is fixed to the pump casing 13, the mounting efficiency can be improved, and downsizing and thinning of information equipment and high-density mounting of various electronic components can be realized. Also, by integrating the electronic substrate 15 and the pump 1, there is no need to pull out the flexible tape or the lead wire from the pump, the noise resistance of the electronic substrate 15 is improved, and malfunction or failure of the electronic component is prevented. You can also.

  Further, by fixing the outer peripheral end 152 of the electronic substrate 15 to the pump casing 13, waterproofness and dust resistance can be improved. Further, by disposing the Hall elements 42a to 42c in the internal space 23 (the space in which the motor stator 12 is accommodated) formed by the recess 133 of the pump casing 13, the Hall elements 42a to 42c are not mounted due to external force. Can be prevented.

  Further, as shown in FIGS. 3A and 3B, lead wires for connecting the Hall elements 42 a to 42 c and the drive IC 41 are arranged on the electronic substrate 15. Therefore, electromagnetic noise can be suppressed as compared with the case where the lead wire is not on the electronic substrate 15, and thus detection accuracy can be improved.

  Further, the groove 134 (FIG. 1C) formed in the pump casing 13 does not prevent the pump 1 from being thinned, and does not complicate the structure of the pump 1. Signal transmission can be performed. Furthermore, by fixing the outer peripheral end portion 152 of the electronic substrate 15 to the pump casing 13, the outer peripheral end portion 152 changes from a free end to a fixed end, and generation of abnormal noise can be prevented.

[Modification]
FIG. 6 is an explanatory diagram for explaining a pump 1A according to another embodiment of the present invention. FIG. 7 is an explanatory diagram for explaining pumps 1B and 1C according to another embodiment of the present invention.

  As shown by a dotted line frame X in FIG. 6, in the pump 1 </ b> A, the convex portion (mounting portion) 131 of the pump casing 13 is covered with the electronic substrate 15. In FIG. 6, the convex portion (mounting portion) 131 of the pump casing 13 is in contact with the vicinity of the center of the electronic substrate 15. That is, according to the present invention, as shown in FIG. 1, the outer peripheral end 152 of the electronic board 15 and the edge of the insertion hole 15a may be fixed to the pump casing 13, or the electronic board 15 is shown in FIG. The outer peripheral end 152 and the vicinity of the center of the electronic substrate 15 may be fixed to the pump casing 13. Note that the convex portion (mounting portion) 131 of the pump casing 13 and the vicinity of the center of the electronic substrate 15 do not have to be in contact with each other, and only the outer peripheral end 152 of the electronic substrate 15 is fixed to the pump casing 13. Also good.

On the other hand, in FIG. 1, a portion near the suction port (or discharge port) 31 of the outer peripheral end portion 152 of the electronic substrate 15 is fixed to the step portion of the pump casing 13. As shown by the dotted line frame Y ₁ and the dotted line frame Y ₂ , not only the portion near the suction port (or the discharge port) 31 in the outer peripheral end portion 152 of the electronic substrate 15, but also the portion on the opposite side of the pump casing 13. You may fix to the step part. Conversely, the outer peripheral end surface of the outer peripheral end 152 of the electronic substrate 15 may be fixed to the inner peripheral wall surface of the pump casing 13 as indicated by the dotted line frames Z ₁ and Z ₂ in FIG.

  Further, the motor stator includes a plurality of salient poles extending radially outwardly of the impeller, and the electronic substrate is configured such that the drive IC is interposed between the salient poles in the pump casing. You may make it fix to. Accordingly, the motor stator is provided with a plurality of salient pole portions extending radially outward in the radial direction of the impeller, and the electronic substrate includes an electronic component such as a drive IC. Since the pump is fixed to the pump casing in an intervening state, the thickness of the impeller in the axial direction can be made thinner in the pump than in the above-described embodiment, and the overall thickness of the pump can be reduced. Can be achieved. For example, when the number of salient pole parts is small as shown in FIG. 2B, the space between the salient pole parts can be made wider than that shown in FIG. Configuration can be taken.

  The pump and the pump system according to the present invention are useful as those capable of integrating electronic components such as a driving IC or a Hall element and improving the mounting efficiency.

Claims (7)

An impeller having a plurality of blades formed on the outer periphery and a rotor magnet provided on the inner periphery;
A motor stator disposed facing the rotor magnet;
A pump casing in which the impeller and the motor stator are partitioned, and a recess for accommodating the motor stator is formed;
An electronic board on which a driving IC for supplying current to the motor stator is mounted,
The electronic board is arranged such that the mounted driving IC faces the motor stator, and is fixed to the pump casing.   2. The pump according to claim 1, wherein an outer peripheral end portion of the electronic substrate is fixed to the pump casing so as to cover the concave portion. The pump further includes magnetic detection means for performing magnetic detection of the rotor magnet,
3. The pump according to claim 1, wherein the magnetic detection unit is attached to the concave side of the electronic substrate and in the vicinity of the outer peripheral end. 4.   4. The pump according to claim 3, wherein a lead wire connecting the magnetic detection means and the driving IC is wired on the electronic substrate.   The pump according to any one of claims 1 to 4, wherein a groove for passing wiring of the electronic board is formed in the pump casing.   The pump according to any one of claims 1 to 5, wherein a driving system of the pump by the driving IC is a three-phase driving system. A pump according to any one of claims 1 to 6;
A control circuit for transmitting a control signal for changing the rotational speed of the impeller to the pump;
A pump system comprising:
The pump includes an FG terminal that outputs an FG signal that periodically changes according to the rotational speed of the impeller,
The pump system according to claim 1, wherein the control circuit transmits the control signal based on an FG signal received from the FG terminal.

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