Motor circuit board and motor having the same mounted thereon

Abstract

To provide a motor circuit board and a motor that can adjust a sensor board to an optimum angle while checking an energization angle and can prevent problems such as a size increase of the motor and an increase in the number of components.SOLUTION: The motor circuit board includes: a control board 18 fixed in a casing 2 of a motor 1 and having mounted thereon a drive control circuit that energizes coils of respective phases wound around a stator 8 of the motor 1 to activate the motor 1; a sensor board 23 arranged so as to be overlapped on the control board 18 and having mounted thereon a sensor body 27 opposed to a detector 12 of a rotation sensor 28 fixed to one end of an output shaft 6 of the motor 1; adjustment fixing parts 24, 26 for fixing the sensor board 23 to be centered on the output shaft 6 in such a manner that the angle can be adjusted; and contact members 30, 31 respectively provided on opposed surfaces of the control board 18 and the sensor board 23 and coming into contact with each other irrespective of an adjusted angle of the sensor board 23 to keep the drive control circuit and the sensor body 27 in a conducting state.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a motor circuit board and a motor equipped with the same. [Background technology]

[0002] For example, the motor circuit board described in Patent Document 1 is mounted with a drive control circuit and a rotation sensor IC for controlling the drive of an electric motor, and is fixed with screws or the like inside the casing of the electric motor with the rotation sensor IC facing a magnet fixed to one end of the rotating shaft. Changes in the magnetic field of the magnet are detected as the rotation angle of the rotor by the rotation sensor IC, and based on the detection signal, the drive control circuit energizes the coils of each phase of the stator at a predetermined energization angle to drive the motor.

[0003] The state in which the circuit board is fixed to the casing with screws etc. is uniquely determined, but there are individual differences for each product, and accordingly, the relative angle between the magnet and the rotation sensor IC centered on the rotating shaft, and in turn the current angle of the coil based on the detection signal, varies, which is a factor in reducing motor performance. One possible solution is to correct the current angle using a program, but this would require a high-performance drive control circuit, which would cause another problem of rising costs.

[0004] On the other hand, the sensor board described in Patent Document 2 is mounted with a rotation sensor, and the sensor board is fixed in the motor casing with screws or the like in a position where the rotation sensor faces a magnet provided at one end of the rotating shaft of the brushless motor. The sensor board and the board connector provided in the motor casing are electrically connected via a board wire harness, and the board connector is electrically connected to an external controller via a signal line and U, V, and W phase power lines. A detection signal from the rotation sensor is output to the controller via the board wire harness and the signal line, and a drive signal from a drive control circuit mounted on this controller is supplied to a stator coil via the power line and the board wire harness to drive the motor.

[0005] In such a brushless motor, for example, the screw holes in the sensor board can be formed into elongated holes to make the angle of the sensor board around the rotation axis adjustable. In this case, after operating the motor with a controller, the sensor board can be adjusted to the optimum angle while checking the actual coil current angle. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2021-158763 A [Patent Document 2] JP 2023-2988 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the technology of Patent Document 2, an external controller has the function of controlling the motor, but from the viewpoint of saving space in the motor, it is possible to incorporate the controller function into the brushless motor. In this case, a control board on which a drive control circuit is mounted is manufactured instead of a controller and fixed inside the motor casing. The sensor board is fixed inside the motor casing with screws or the like so that its angle can be adjusted, as in Patent Document 2, and the sensor board and control board are connected via a wire harness. This keeps the rotation sensor and drive control circuit in a conductive state, and the sensor board can be adjusted to an optimal angle while driving the motor and checking the actual coil current angle.

[0008] However, in this configuration, it is necessary to interpose a wire harness between the sensor board and the control board, and to provide connectors on the opposing surfaces of both boards to connect the couplers at both ends. As a result, the two boards are spaced apart, and the motor casing and therefore the motor become larger in the output shaft direction to secure the space. Furthermore, the need for new wire harnesses and connectors creates the problem of an increase in the number of parts on the circuit board.

[0009] The present invention has been made to solve these problems, and its object is to provide a motor circuit board that can adjust the sensor board to the optimum angle while checking the current flow angle, and that can prevent problems such as an increase in the size of the motor and an increase in the number of parts, and a motor equipped with the same. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, the motor circuit board of the present invention is characterized in comprising: a control board fixed within the motor casing and mounting a drive control circuit that operates the motor by passing current through coils of each phase wound around the stator of the motor; a sensor board arranged so as to overlap the control board and mounting a sensor main body that faces a detector of a rotation sensor fixed to one end of the motor's output shaft; an adjustment fixing portion that fixes the sensor board so that the angle can be adjusted around the output shaft; and contact members provided on the opposing surfaces of the control board and the sensor board, which come into contact with each other regardless of the adjustment angle of the sensor board to maintain a conductive state between the drive control circuit and the sensor main body.

[0011] In another aspect, the contact member may comprise a control board side land formed as part of a conductor pattern on the control board, and a sensor board side land formed as part of a conductor pattern on the sensor board, and at least one of the control board side land and the sensor board side land may be arc-shaped with the axis of the output shaft as its center.

[0012] In another aspect, the contact member may include a land formed on either the control board or the sensor board, forming an arc shape centered on the axis of the output shaft, and a terminal whose base end is soldered to the other of the control board or the sensor board and whose tip end is elastically brought into contact with the land.

[0013] In another aspect, the adjustment fixing portion may include an elongated hole formed in the sensor board and having an arc shape centered on the output shaft, and a screw member that fixes the sensor board via the elongated hole.

[0014] In another aspect, the adjustment fixing portion may include a guide portion that guides the change in angle of the sensor board about the output shaft, and a hardened layer of adhesive interposed between the sensor board and the control board.

[0015] In another embodiment, the sensor board may be placed on the surface of the control board opposite the detector, with the sensor main body facing the detector via a communication hole formed in the control board.

[0016] In another embodiment, the sensor board may be placed on the surface of the control board on the side of the detector, with the sensor main body facing the detector.

[0017] A motor according to the present invention is characterized in that it is equipped with the above-mentioned motor circuit board. Effect of the Invention

[0018] The motor circuit board of the present invention and the motor equipped with it make it possible to adjust the sensor board to the optimum angle while checking the power supply angle, and also to prevent problems such as an increase in the size of the motor and an increase in the number of parts. [Brief description of the drawings]

[0019] [Figure 1] 1 is a perspective view showing a motor to which a motor circuit board according to an embodiment of the present invention is applied; [Diagram 2] FIG. 2 is an exploded perspective view of the motor showing the location of the circuit board. [Diagram 3] FIG. 4 is a cross-sectional view of the motor showing the location of the circuit board. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] FIG. 2 is an exploded perspective view of the circuit board as viewed obliquely from below. [Figure 6] 6 is a cross-sectional view taken along line VI-VI in FIG. 4. [Figure 7] 7 is a cross-sectional view taken along line VII-VII in FIG. 4. [Figure 8] 3 is an exploded perspective view corresponding to FIG. 2 and showing a first modified example in which the positional relationship between the control board and the sensor board is reversed. FIG. [Figure 9] FIG. 6 is an exploded perspective view showing a first modified example and corresponding to FIG. 5. [Figure 10] 3 is an exploded perspective view corresponding to FIG. 2 and showing a second modified example in which a sensor board is bonded onto a control board with an adhesive. FIG. [Figure 11] 8 is a cross-sectional view corresponding to FIG. 7 and showing a temporarily fastened state of Modified Example 3 in which a terminal is provided on the sensor board instead of a land on the sensor board side. FIG. [Figure 12] FIG. 8 is a cross-sectional view corresponding to FIG. 7 and showing a fully fastened state of Modification Example 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor circuit board and a motor embodying the present invention will now be described. Fig. 1 is a perspective view showing a motor to which a motor circuit board of this embodiment is applied, Fig. 2 is an exploded perspective view of the motor showing the location of the circuit board, Fig. 3 is a cross-sectional view of the motor showing the location of the circuit board, and Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. For the sake of convenience, the up-down directions will be expressed below assuming that the motor shown in Fig. 1 is in a position with its output shaft facing downward.

[0021] As shown in Figures 1 to 3, the casing 2 of the motor 1 is composed of a central case 3 with a pair of bracket parts 3a integrally formed therewith, an upper case 4 closing the upper side of the central case 3, and a lower case 5 closing the lower side of the central case 3, and is cylindrical in shape extending in the vertical direction as a whole, defining a space inside. Each of the cases 3 to 5 is made of an insulating synthetic resin material. An output shaft 6 extending in the vertical direction is disposed in the center of the casing 2, and is rotatably supported by a bearing (not shown). The lower end of the output shaft 6 protrudes outside the casing 2.

[0022] A rotor 7 having a permanent magnet is fixed to the output shaft 6 inside the casing 2, and a stator 8 with coils 8a of the U, V, and W phases wound thereon is disposed on the outer periphery of the rotor 7. The motor 1 is used to drive various devices, and is attached to the device to be driven by bolts via the bracket portion 3a, and the output shaft 6 protruding outward is connected to the device to be driven to drive it.

[0023] The central case 3 is integrally formed with an upwardly facing mounting base surface 9 that forms an annular shape centered on the axis C of the output shaft 6, and a cylindrical peripheral wall 10 that surrounds the mounting base surface 9, and a board accommodating chamber 11 is defined between these parts 9, 10 and the upper case 4. An axial hole 9a is formed in the center of the mounting base surface 9, and a magnet 12 is fixed to the mounting base surface 9, with the upper end of the output shaft 6 protruding into the board accommodating chamber 11 through this axial hole 9a. This magnet 12 corresponds to the "detector" of the present invention.

[0024] 2 and 4, three first boss portions 13 and two second boss portions 14 are respectively provided to protrude from the mounting base surface 9. In addition, press-fit terminals 16 are provided at six locations on the mounting base surface 9, and each press-fit terminal 16 is connected to the coil 8a of one of the phases of the stator 8, and has a pair of terminal portions 16a protruding upward from the mounting base surface 9.

[0025] A circular plate-shaped control board 18 is disposed within the board housing chamber 11, and a communication hole 18a is formed through the center of the control board 18. Although not shown, an inverter circuit that energizes each coil 8a of the stator 8 to operate the motor 1, and a control circuit that controls the inverter circuit based on a detection signal output from a sensor main body 27 (described later) are mounted on the control board 18. The control circuit and the inverter circuit correspond to the "drive control circuit" of the present invention.

[0026] The control board 18 abuts against the first boss portion 13 and the second boss portion 14, and is fastened from above to each of the first boss portions 13 with screws 19. In this state, the terminal portions 16a of the press-fit terminals 16 are press-fitted and fixed into terminal holes 20 that penetrate the control board 18, and the coils 8a of each phase of the stator 8 and the inverter circuit on the control board 18 are connected via the press-fit terminals 16.

[0027] Four press-fit terminals 21 protrude upward from the control board 18 and extend into a connector housing 4a formed integrally with the upper case 4 to form a connector 22. When the motor 1 is attached to a device to be driven, a coupler of a wire harness from a host controller that controls the device is connected to the connector 22, enabling mutual communication between the host controller and the motor 1.

[0028] As shown in Figs. 2 to 4, a sensor board 23 in the form of a rectangular plate with both ends forming an arc is disposed on the control board 18. Long holes 24 each having an arc shape centered on the axis C of the output shaft 6 are formed at both ends of the sensor board 23, and screws 26 are screwed into each second boss portion 14 from above through these long holes 24 and screw holes 25 formed through the control board 18. As a result, the sensor board 23 is fastened in a state of being stacked on the upper surface of the control board 18, and the angle of the sensor board 23 centered on the axis C of the output shaft 6 can be adjusted within the range of the long holes 24. The long holes 24 correspond to the "adjustment fixing portion" of the present invention, and the screws 26 correspond to the "adjustment fixing portion" and "screw member" of the present invention. The shapes of the control board 18 and the sensor board 23 are not limited to those described above and can be changed arbitrarily.

[0029] Three sensor bodies 27 are attached to the underside of the sensor board 23 at intervals of 120° centered on the axis C of the output shaft 6. Each sensor body 27 faces the magnet 12 via the communication hole 18a of the control board 18, and outputs a detection signal that changes in response to the rotation angle of the rotor 7 in response to a change in magnetic pole caused by the rotation of the magnet 12 while the motor 1 is in operation. These sensor bodies 27 and magnet 12 constitute a Hall sensor 28, which corresponds to the "rotation sensor" of the present invention. Note that instead of the Hall sensor 28, a well-known electromagnetic pickup, MR sensor, or the like may be used as a rotation sensor.

[0030] 5 is an exploded perspective view of the circuit board as viewed obliquely from below, FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 4, and FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. Contact members for electrically connecting the sensor body 27 to the control circuit and the inverter circuit are provided on the upper surface of the control board 18 and the lower surface of the sensor board 23. In this embodiment, lands are formed as contact members on the opposing surfaces of the control board 18 and the sensor board 23, respectively, and are hereinafter referred to as the control board land 30 and the sensor board land 31. A land is a portion of a conductor pattern formed to connect electronic components on a board to each other, and in this embodiment, the control board land 30 is connected to the control circuit and the inverter circuit, and the sensor board land 31 is connected to the sensor body 27 via the conductor patterns on each of the boards 18 and 23. For example, according to a well-known wet etching process, the lands 30 and 31 are formed by slightly protruding from the surfaces of the boards 18 and 23 through the processes of applying resist, etching, and removing the resist.

[0031] As shown in Figs. 2, 6, and 7, the control board lands 30 form a total of five points that are parallel to each other in the radial direction across the axis C of the output shaft 6. Also, as shown in Figs. 5, 6, and 7, the sensor board lands 31 form a total of five arc-shaped lines that are parallel to each other in the radial direction across the axis C of the output shaft 6. As shown in Fig. 7, the control board lands 30 and the sensor board lands 31 are formed at positions corresponding to each other in the radial direction and slightly rise from the boards 18 and 23, so that when the boards 18 and 23 are fastened with the screws 26 and overlapped, they are in contact with each other and are electrically conductive. Even if the angle of the sensor board 23 centered on the axis C is changed within the range of the long hole 24, the lands 30 and 31 continue to be in contact with each other and are maintained in a conductive state regardless of the adjustment angle.

[0032] As described below, the lands 30, 31 perform functions such as transmitting a detection signal from the sensor main body 27 to a control circuit or supplying power to the sensor main body 27, so the number of lands 30, 31 can be changed as desired depending on the type of sensor to be applied, etc. Furthermore, the shapes of the lands 30, 31 are not limited to those described above, and for example, the control board side land 30 may be an arc-shaped line and the sensor board side land 31 may be a point, or both lands 30, 31 may be arc-shaped lines.

[0033] The motor circuit board 32 of this embodiment is constituted by the above-mentioned control board 18, sensor board 23, the sensor body 27, control circuit and inverter circuit mounted on each board 18, 23, control board side land 30, sensor board side land 31, screws 26 for fastening the sensor board 23 to the mounting base surface 9, etc.

[0034] When the motor 1 configured in this way is attached to a device to be driven and the output shaft 6 rotates, a detection signal that changes according to the rotation angle of the rotor 7 is output from the sensor body 27. The detection signal is input to the control circuit via the conductor pattern on the sensor board 23, the sensor board side land 31, the control board side land 30, and the conductor pattern on the control board 18, and is also output to the upper controller via the connector 22. Based on various information including this detection signal, a command signal for driving the motor 1 is input from the upper controller via the connector 22 to the control circuit, and the inverter circuit is controlled by the control circuit. Then, the inverter circuit energizes the coils 8a of each phase of the stator 8 at a predetermined energization angle, and the motor 1 operates to drive the device to be driven.

[0035] Next, a procedure for adjusting the angle of the sensor board 23 about the axis C of the output shaft 6 will be described. As described above, in the motor circuit board 32 of this embodiment, even if the rotation angle of the sensor board 23 about the axis C is changed within a predetermined range, the control board land 30 and the sensor board land 31 continue to be in contact with each other. Therefore, the sensor main body 27 is maintained in a conductive state with the control circuit and the inverter circuit, and the angle of the sensor board 23 can be changed while the motor 1 is operating to check the actual energization angle.

[0036] First, all assembly work other than the attachment of the upper case 4 is completed, and the screws 26 fastening the sensor board 23 are temporarily tightened, that is, the angle of the sensor board 23 is made changeable. Even in the temporarily tightened state, the lands 30, 31 slightly raised from the boards 18, 23 are kept in contact, so that the coils 8a of each phase can be energized based on the detection signal from the sensor body 27 to operate the motor 1.

[0037] Then, while the motor 1 is operating, the angle of the sensor board 23 is changed to check the actual energization angle, and when the optimum energization angle is reached, the screws 26 are fully tightened to fix the angle of the sensor board 23, as shown in Figures 6 and 7. After that, attach the upper case 4 to the center case 3, and the angle adjustment of the sensor board 23 is complete.

[0038] 6 and 7, the thickness of the lands 30, 31 is exaggerated, so that the substrates 18, 23 are separated from each other in the areas other than the lands 30, 31. However, in reality, the protrusion of the lands 30, 31 is very small, so that the substrates 18, 23 are in contact with each other in the areas other than the lands 30, 31 with slight bending.

[0039] Next, a comparison between the present embodiment and the conventional technology based on the technology of Patent Document 2 will be described. In the prior art, the function of the controller of the technology of Patent Document 2 is built into the brushless motor, and a control board equipped with the controller function is fixed inside the motor casing and connected to the sensor board via a wire harness. For this reason, it is necessary to interpose a wire harness between the sensor board and the control board, and to provide connectors on the opposing surfaces of both boards to connect the couplers at both ends. As a result, the two boards are spaced apart, the motor casing becomes larger in the output shaft direction, and the number of parts on the circuit board increases due to the addition of the wire harness, connectors, etc.

[0040] In this embodiment, the functions of such a wire harness and connector are performed by the lands 30, 31 formed on each of the boards 18, 23. Since these lands 30, 31 are parts of a conductor pattern, the boards 18, 23 are arranged overlapping each other so that the lands 30, 31 come into contact with each other. In other words, since it is not necessary to space the boards 18, 23 from each other, the external dimensions of the casing 2 along the direction of the axis C of the output shaft 6 can be reduced, and therefore the motor 1 can be made smaller in size in the direction of the axis C.

[0041] Furthermore, since there is no need for a wire harness and no need to provide connectors on the opposing surfaces of the boards 18, 23, the number of parts on the circuit board 32 can be reduced, which contributes to reducing manufacturing costs.

[0042] In particular, in this embodiment, lands 30, 31 are provided on each of the substrates 18, 23 as contact members. These lands 30, 31 can be formed at the same time as forming the conductor pattern by wet etching or the like as described above, so there is no need to add a special process for forming the lands 30, 31 in the manufacturing process of the substrates 18, 23. Also, in order to contact the lands 30, 31 regardless of the angle of the sensor substrate 23, the control substrate side land 30 is formed as a point and the sensor substrate side land 31 is formed as an arc-shaped line, but even lands 30, 31 of such a shape can be easily formed. Therefore, the manufacturing cost of the circuit substrate 32 can be further reduced.

[0043] In addition, because the sensor board 23 is fastened by the screw 26 through the long hole 24, the angle of the sensor board 23 is adjusted with the screw 26 temporarily fastened, and the adjustment work is completed by simply fastening the screw 26 at the optimal energization angle. As a result, the angle of the sensor board 23 can be easily adjusted, which contributes to reducing manufacturing costs. In addition, after the screw 26 is fully fastened, there is no risk of the angle being inadvertently changed even if some external force acts on the sensor board 23. Therefore, after the angle adjustment is performed, the motor 1 can continue to operate at the optimal energization angle, which contributes to improving the reliability of the motor 1.

[0044] In addition, since the sensor board 23 is placed on the upper surface of the control board 18, in other words, on the surface opposite to the magnet 12, the sensor board 23 can be easily manipulated during adjustment work. That is, during adjustment work, the sensor board 23 can be directly grasped and rotated, which also contributes to facilitating the adjustment work and reducing manufacturing costs.

[0045] The present invention is not limited to the above-mentioned embodiment, and other examples 1 to 3 will be described below. [Example 1] In the above embodiment, the sensor board 23 is placed on the upper surface of the control board 18, but in this modified example 1, the positional relationship between the two boards 18, 23 is reversed. Fig. 8 is an exploded perspective view corresponding to Fig. 2 showing modified example 1, and Fig. 9 is an exploded perspective view corresponding to Fig. 5 showing modified example 1.

[0046] A pair of elongated holes 41 are formed in the control board 18, which are arc-shaped with the axis C of the output shaft 6 as the center, and screw holes 42 are formed in the sensor board 23 corresponding to the elongated holes 41, and nuts 43 are fixed to the lower surface of the sensor board 23 corresponding to the screw holes 42. The sensor board 23 is placed on the lower surface of the control board 18, and screws 44 are screwed into the nuts 43 from above through the elongated holes 41 of the control board 18 and the screw holes 42 of the sensor board 23. Therefore, in this modification 1, the sensor board 23 is indirectly attached to the mounting base surface 9 via the control board 18, and the sensor main body 27 attached to the lower surface of the sensor board 23 faces the magnet 12 of the output shaft 6. A slit-shaped engagement operation portion 45 is formed in the center of the sensor board 23 and is exposed upward through the communication hole 18a of the control board 18.

[0047] The control board lands 30 are formed on the lower surface of the control board 18, and the sensor board lands 31 are formed on the upper surface of the sensor board 23, and their shapes and overlapping arrangement are the same as in the above embodiment.

[0048] The adjustment of the angle of the sensor board 23 as a whole is similar to that of the embodiment, but the rotation of the sensor board 23 is performed by engaging the tip of a flat head screwdriver or the like with the engagement operation portion 45 through the communication hole 18a. In this modification 1 as well, the same effects as those of the embodiment can be achieved.

[0049] [Example 2] In the above embodiment, the sensor board 23 is fastened by the screw 26 through the long hole 24 as the adjustment and fixing part, but in this modification 2, the sensor board 23 is adhered onto the control board 18 by an adhesive. Fig. 10 is an exploded perspective view corresponding to Fig. 2 and showing the modification 2.

[0050] A pair of guide parts 51 are protruding from the control board 18, each of which is in the shape of an arc centered on the axis C of the output shaft 6. A quick-drying adhesive 52 is applied to an area on the control board 18 that avoids the lands 30, 31 between the guide parts 51, for example, the area shown by hatching in the figure, and then the sensor board 23 is disposed. When the angle of the sensor board 23 is changed, both ends of the arc are guided while sliding against the guide parts 51, respectively, and the angle of the sensor board 23 can be changed around the axis C. When the sensor board 23 is left in a state where the optimal current-carrying angle is reached, the adhesive 52 hardens, and the sensor board 23 is bonded to the control board 18 through the hardened layer 53. In this example, the guide parts 51 and the hardened layer 53 of the adhesive 52 interposed between the two boards 18, 23 correspond to the "adjustable and fixed part" of the present invention. As with the fastening by the screws 26 in the embodiment, the angle adjustment of the sensor board 23 can be easily performed.

[0051] [Example 3] In the above embodiment, the lands 30, 31 are formed on the control board 18 and the sensor board 23 as contact members, but in this modification 3, a terminal 61 is provided on the sensor board 23 instead of the sensor board side land 31. Fig. 11 is a cross-sectional view corresponding to Fig. 7 showing the provisionally fastened state of modification 3, and Fig. 12 is a cross-sectional view corresponding to Fig. 7 showing the final fastened state. Note that although a specific terminal 61 is shown in each drawing, the other terminals have the same structure.

[0052] 11 denotes a conductor pattern formed on the sensor board 23 and connected to the sensor body 27, and the base end of the terminal 61 is soldered onto the conductor pattern 62. The terminal 61 is made of a conductor having spring properties, and its tip 61a is curved with a convex upward shape. In the provisionally fastened state of the screw 26 shown in FIG. 11, the terminal 61 is in elastic contact with the tip 61a of the control board land 30 for electrical continuity. Therefore, if the current-carrying angle is checked in this state and the screw 26 is finally fastened at the optimum current-carrying angle, the terminal 61 is sandwiched between the two boards 18, 23 in a state of being deformed into a flat shape, as shown in FIG. 12.

[0053] 12, the thickness of the terminals 61 and the lands 30 are exaggerated, so that the two substrates 18, 23 are separated from each other in areas other than the terminals 61 and the lands 30. However, in reality, the thickness of the terminals 61 and the protrusion of the lands 30 are minute, so that the substrates 18, 23 are in contact with each other in areas other than the terminals 61 and the lands 30 with slight bending.

[0054] According to this modification 3, when the screw 26 is temporarily fastened, the tip 61a of the terminal 61 elastically contacts the control board land 30, which has the advantage of maintaining a reliable electrical connection. Note that, contrary to this modification 3, the terminal 61 may be provided on the sensor board 23, and an arc-shaped land like the control board land 30 may be formed on the control board 18. [Explanation of symbols]

[0055] 1 Motor 2 Casing 6 Output shaft 8 Stator 8a coil 12 Magnet (detector) 18 Control Board 18a Communication hole 23 Sensor board 24 Long hole (adjustment fixing part) 26 Screw (adjustment fixing part, screw material) 27 Sensor body 28 Hall sensor (rotation sensor) 30 Control board side land 31 Sensor board side land 51 Guide part (adjustment fixing part) 53 Hardened layer (adjustment fixing part) 61 Terminal 61a Tip

Claims

1. a control board that is fixed inside a casing of the motor and has a drive control circuit mounted thereon for energizing coils of each phase wound around a stator of the motor to operate the motor; a sensor board on which a sensor main body is mounted, the sensor main body being opposed to a detector of a rotation sensor fixed to one end of an output shaft of the motor; an adjustment fixing part that fixes the sensor board so as to be angle adjustable around the output shaft; contact members provided on the opposing surfaces of the control board and the sensor board, the contact members being in contact with each other regardless of the adjustment angle of the sensor board to maintain a conductive state between the drive control circuit and the sensor main body; A motor circuit board comprising:

2. the contact member includes a control board side land formed as a part of a conductor pattern on the control board, and a sensor board side land formed as a part of a conductor pattern on the sensor board, At least one of the control board side land and the sensor board side land is formed in an arc shape centered on the axis of the output shaft.

2. The motor circuit board according to claim 1.

3. The contact member includes a land formed on either the control board or the sensor board and having an arc shape centered on the axis of the output shaft, and a terminal having a base end soldered to the other of the control board or the sensor board and having a tip end elastically brought into contact with the land.

2. The motor circuit board according to claim 1.

4. The adjustment fixing portion includes a long hole formed in the sensor board and having an arc shape centered on the output shaft, and a screw member that fixes the sensor board via the long hole.

3. The motor circuit board according to claim 1, wherein the first and second electrodes are electrically connected to each other.

5. The adjustment fixing portion includes a guide portion that guides an angle change of the sensor board around the output shaft, and a cured layer of adhesive interposed between the sensor board and the control board.

3. The motor circuit board according to claim 1, wherein the first and second electrodes are electrically connected to each other.

6. The sensor board is placed on the surface of the control board opposite to the detector, and the sensor body faces the detector via a communication hole formed in the control board.

3. The motor circuit board according to claim 1, wherein the first and second electrodes are electrically connected to each other.

7. The sensor board is placed on the surface of the control board on the side of the detector, and the sensor body faces the detector.

3. The motor circuit board according to claim 1, wherein the first and second electrodes are electrically connected to each other.

8. A motor comprising the motor circuit board according to claim 1 or 2 mounted thereon.

Images