JPH0539166U - Printed circuit board mounting structure for rotating electrical machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] Fixing the printed circuit board within the limited thickness of the frame by cutting the printed circuit board conductor at the printed circuit board drawing part, eliminating insulation failure and floating of the printed circuit board at the printed circuit board mounting part. As a result, a printed circuit board mounting structure for a rotary electric machine, which enables miniaturization while maintaining high characteristics, is provided. [Structure] A cutout portion 20 is provided at the bottom of a frame 6, and a printed circuit board 11 that is drawn to the outside is arranged in the cutout portion 20
The wire 17 drawn from the rotating electric machine is connected to the printed board 11
Connect to. The cutout may reach a side surface of the frame, a hole may be formed in the cutout so as to penetrate the bottom surface of the frame, and the printed board may be drawn out in a substantially flat plate shape from the hole. An insulator that insulates the frame and the winding may be provided on the printed board.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a printed circuit board mounting structure of a rotary electric machine for connecting the rotary electric machine and an external circuit.

[0002]

[Prior Art]

 FIG. 11 and FIG. 12 show an example of a conventional mounting structure of a printed circuit board for connecting a rotating electric machine and an external circuit. This example is an example of a motor. In FIGS. 11 and 12, a bearing portion 139 protruding upward is provided at the center of a frame 126 of the motor, and a stator core 125 is fitted and fixed to the outer peripheral side of the bearing portion 139. The stator core 125 has a plurality of salient poles radially, and a stator coil 124 is wound around each salient pole. The frame 126 is formed in a dish shape, and the flexible printed circuit board 132 is fixed to the bottom of the dish frame 126. As shown in FIG. 12, a lead-out portion 131 to the outside extends from the flexible printed circuit board 132. The drawer 131 is drawn out of the motor through a window hole 135 formed in the bottom of the frame 126. A wire 137 drawn from the stator coil 124 is connected to a predetermined land formed on the flexible printed circuit board 132 by solder 138, and the wire 137 is connected to an external circuit through a conductive pattern formed on the flexible printed circuit board 132. There is.

The outer peripheral surface of the stator core 125 faces the inner peripheral surface of a rotor magnet which is rotatably supported and is integral with a rotor case (not shown) with a certain gap. The frame 126 is made of metal such as aluminum or iron.

[0004]

[Problems to be solved by the device]

 According to the conventional printed circuit board mounting structure for a motor, the flexible printed circuit board 132 is mounted inside the motor, and the pull-out portion 131 of the flexible printed circuit board 132 is pulled out from the window hole 135 of the frame 126 to the outside. Since it is necessary to bend the lead-out portion 131 while passing it through the window hole 135, there is a problem in that the lead-out portion 131 is cut at an edge portion of the window hole 135 of the frame 126 made of metal. Since 135 is formed small for convenience of encapsulation, there is a drawback that it is likely to come into contact with the conductor of the printed circuit board 132 and cause insulation failure. Further, as indicated by a symbol G in FIG. 11, the lead-out portion 131 floats from the bottom surface of the frame 126, and moreover, the stacking dimension of the frame 126, the flexible printed circuit board 132, its insulating material and the solder 138 becomes large, so that the motor If the overall size is constant, it is necessary to reduce the dimensions of the core 125 and the like, so good characteristics cannot be obtained, and there is a drawback that it is not suitable for downsizing the motor.

Further, as another example of a conventional printed circuit board mounting structure for a motor, there is one in which a flexible printed circuit board is fixed to the outer end surface of a stator yoke, as disclosed in Japanese Patent Laid-Open No. 57-202867. With such a structure, there is a problem that the axial dimension of the motor is increased by the thickness of the flexible printed circuit board, and the parts mounted on the flexible printed circuit board are exposed and are easily damaged. There is a drawback.

The present invention has been made in order to solve such a problem, and can prevent cutting and insulation failure of a printed circuit board conductor at a drawn-out portion from a rotary electric machine, and can be mounted on a printed circuit board. The printed circuit board mounting structure of the rotating electric machine enables the miniaturization of the rotating electric machine while maintaining high characteristics by eliminating the floating of the printed circuit board in the section and fixing the printed circuit board within the limited thickness of the rotating electric machine. The purpose is to provide.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in the invention according to claim 1, a cutout portion is provided in a bottom portion of a frame of the rotating electric machine, and a printed board which is drawn out to the outside of the rotating electric machine is arranged in the cutout portion and is drawn out from the rotating electric machine. The wire was connected to the printed circuit board. In the invention according to claim 2, the notch is formed so as to reach the side surface of the frame and wider than the printed circuit board, and the notch has a hole penetrating the bottom surface of the frame and wider than the printed circuit board. The printed circuit board was pulled out from this hole into a substantially flat plate shape. According to the third aspect of the present invention, the printed board is provided with an insulator that insulates the frame and the winding of the rotary electric machine.

[0008]

[Action]

 According to the invention of claim 1, the printed circuit board is arranged in the cutout portion of the bottom of the frame, the thickness of the printed circuit board does not add to the thickness of the rotating electric machine, and the printed circuit board has the cutout portion. It suffices to pull it out of the rotating electric machine in the posture of being placed in, and it is not necessary to bend the printed circuit board and pass it through the hole of the frame. According to the second aspect of the present invention, when the printed circuit board is arranged in the hole on the bottom surface of the frame, the printed circuit board is pulled out from the side surface of the frame in a substantially flat plate shape through the cutout portion reaching the side surface of the frame. .. According to the third aspect of the present invention, the insulator provided on the flint board insulates the frame of the rotating electric machine from the winding.

[0009]

【Example】

 Hereinafter, an embodiment of a printed circuit board mounting structure of a rotating electric machine according to the present invention will be described with reference to the drawings. Here, a motor will be described as an example. In FIG. 1, a cup-shaped frame 6 of a motor is integrally formed with a cylindrical bearing portion 13 at the center thereof so as to project upward, and in this bearing portion 13, two upper and lower ball bearings 3 are formed. , 8 outer rings are fitted and fixed. Shaft portions 12 formed integrally with the center of the cup-shaped rotor case 1 are fitted and fixed to the inner rings of the upper and lower ball bearings 3 and 8, so that the rotor case 1 is rotatably supported. ..

The motor according to this embodiment is a magnetic disk drive motor, and the rotor case 1 also serves as a hub. That is, a magnetic disk is fitted to the outer peripheral portion of the rotor case 1, and the magnetic disk is integrally clamped to the rotor case 1 by a disk clamp (not shown) fixed to the upper end surface of the rotor case 1. A sealing seal 2 is fixed to the inner ceiling surface of the rotor case 1.

A drive magnet 7 is attached to the inner peripheral portion of the cup-shaped rotor case 1. A stator core 5 is fitted and fixed to the outer peripheral portion of the bearing portion 3 described above. The stator core 5 is composed of a laminated core and has a plurality of salient poles radially. A stator winding 4 is wound around each salient pole of the stator core 5. The inner peripheral surface of the drive magnet 7 and the outer peripheral surface of the stator core 5 face each other with a constant gap. An insulating seal 9 is attached to the surface of the frame 6 facing the stator winding 4.

As shown in detail in FIGS. 2 to 4, a cutout portion 20 is provided at the bottom of the frame 6, and the ceiling surface of the cutout portion 20 is provided with a flexible printed circuit board 11 that is pulled out to the outside of the motor. The base 14 is fixed. The fixing means for the base portion 14 of the flexible printed board 11 may be adhesive or any other suitable means. Here, it fixed using the double-sided adhesive tape. A hole 15 is formed in the frame 6 to connect the side where the stator core 5 is arranged and the notch 20. A wire 17 drawn from the stator winding 4 is formed in the hole 15 and the flexible printed circuit board 11. After being routed through the hole, it is connected to a predetermined soldering land of the flexible printed board 11 by solder 16. The flexible printed circuit board 11 and its base portion 14 extend laterally from the frame 6 in the same plane. A predetermined conductive pattern is formed on the flexible printed circuit board 11, and the stator winding 4 is electrically connected to an external circuit through this conductive pattern.

As shown in FIG. 1, a nameplate 10 is attached to the bottom surface of the frame 6. The nameplate 10 covers the notch 20 of the frame 6, and thereby covers the base 14 of the flexible printed board 11 and the connection of the wire 17 with the solder 16. Since the principle of rotation of the motor described above is well known, its explanation is omitted.

According to the embodiment described above, since the flexible printed circuit board 11 that is pulled out to the outside of the motor is arranged in the notch 20 at the bottom of the frame 6, the thickness of the flexible printed circuit board 11 does not add to the thickness of the motor. Therefore, the thickness of the motor can be reduced. Further, since it is not necessary to pull out the flexible printed circuit board 11 from the motor while bending the flexible printed circuit board 11, the flexible printed circuit board 11 can be pulled out to the outside of the motor in a flat plate shape with the posture of being arranged in the notch 20. The printed circuit board 11 is housed in the cutout portion 20, and the flexible printed circuit board 11 does not float from the motor frame 6, so that the size of the motor can be reduced. Further, since it is not necessary to bend the flexible printed circuit board 11 to pass through the hole of the frame, it is possible to prevent cutting of the conductive portion of the flexible printed circuit board 11 and insulation failure.

Next, a modified embodiment of the present invention shown in FIGS. 5 to 9 will be described. In FIG. 5, the frame of the motor indicated by reference numeral 6 has a cylindrical outer shape and a cylindrical bearing portion 13 on the inner peripheral side. Two bearings 3 and 8 are vertically fitted on the inner peripheral portion of the bearing portion 13, and the rotor 1 is rotatably supported by the bearings 3 and 8. The stator core 5 is fitted and fixed to the outer peripheral portion of the shaft receiving portion 13. The stator core 5 has a plurality of salient poles, and the armature winding 4 is wound around each salient pole. The tip end surface of the salient pole of the stator core 5 faces the inner peripheral surface of the ring-shaped magnet 7 fixed to the outer peripheral portion of the rotor 1 with an appropriate gap. Since the parts described above are substantially the same as those of the above-described embodiment, the same components are designated by the common reference numerals.

In FIG. 5 to FIG. 9, a cutout portion 36 reaching the side surface of the frame 6 is formed in a portion near the outer peripheral edge of the bottom surface 6 a of the motor frame 6, and the cutout portion 36 continues to the cutout portion 36. A hole 37 communicating with the inside of the frame 6 by penetrating the bottom surface 6a is formed. A flexible circuit board 25 is arranged on the inner bottom of the frame 6. As shown in FIG. 8, the flexible circuit board 25 has a substantially ring shape, and a part of the flexible circuit board 25 is a protruding portion 25a protruding in a tongue shape in the outer peripheral direction. The portion where the protrusion 25a and the protrusion 25a are connected to each other is formed in a step shape to form a wide portion 25b. The hole 37 of the frame 6 is formed to be slightly wider than the wide portion 25b of the flexible circuit board 25, and the wide portion 25b is exposed from the hole 37. The ceiling surface 23 of the cutout portion 36 of the frame 6 is a flat surface, and the flexible circuit board 25 is adhered to the flat ceiling surface 23, so that the flexible circuit board 25 continues to the wide portion 25b. The protruding portion 25a is drawn out to the outside of the motor in a flat plate shape.

As shown in FIG. 9, most of the flexible circuit board 25, particularly the ring-shaped portion, is made of an insulator 26. An appropriate number of wiring patterns 34 are formed on the flexible circuit board 25 from the wide portion 25b to the protruding portion 25a. Each wiring pattern 34 is covered with an insulator 26 except for a part of the end on the side of the protruding portion 25a and the end on the side of the wide portion 25b, and the side of the protruding portion 25a without the insulator 26. And a part of the end portion on the wide portion 25b side is a terminal portion. At the terminal portion on the side of the wide portion 25b of each wiring pattern 34, the wire 17 drawn from the stator winding 4 passes through the notch 28 in the inner peripheral edge portion of the flexible circuit board 25 and then is soldered to the solder 24. Are connected accordingly. The amount of protrusion of the solder 24 is such that the solder 24 does not protrude from the notch 36. It is possible to connect to an external circuit by using the terminal portion of each wiring pattern 34 on the side of the protruding portion 25a. The ring-shaped insulator 26 of the flexible circuit board 25 is fitted on the outer peripheral portion of the bearing portion 13 of the frame 6 and is disposed between the inner bottom portion of the frame 6, that is, the frame 6 and the stator winding 4, and It is insulated from the stator winding 4.

The flexible circuit board 25 has its protruding portion 25a adhered to the flat ceiling surface 23 of the frame 6 as described above, and also has a ring-shaped portion made of an insulator 26 as shown in FIG. The inner peripheral portion is adhered to the frame 6 with an adhesive 32. The outer periphery of the flexible circuit board 25 exposed through the holes 37 of the frame 6 and the holes and notches are sealed with an adhesive.

Also in the case of the embodiment described above, since the flexible printed circuit board 25 that is pulled out to the outside of the motor is arranged in the notch 36 at the bottom of the frame 6, the same effect as that of the above-described embodiment can be obtained. Further, since the insulator 26 for insulating the frame 6 and the stator winding 4 is integrally formed as a part of the flexible circuit board 25, it is not necessary to separately provide the insulator as the insulator as in the above-described embodiment. The advantage is that the number of parts can be reduced. In the above embodiment, since the flexible circuit board 25 is pulled out from the motor in a substantially flat plate shape, a flexible or inflexible circuit board can be used in place of the flexible circuit board 25. is there.

In each of the above-described embodiments, the wire drawn from the inside of the motor is described as the wire drawn from the stator winding, but the present invention is not limited to the wire drawn from the stator winding, and the motor is not limited to the wire drawn from the stator winding. It may be a wire connected to an electric component other than the stator winding arranged inside. FIG. 10 shows such a modified embodiment, in which the wire 44 drawn from the rotational position detecting sensor 42 of the rotor is connected to an external circuit. In FIG. 10, a sensor 42 including a Hall element or a magnetoresistive element is fixed to the inner bottom portion of the frame 6 and arranged so as to detect the leakage magnetic flux of the rotor magnet 7. A flexible circuit board 25 similar to the embodiment described with reference to FIGS. 5 to 9 is fixed to the frame 6 by adhesion with the same configuration as the embodiment described with reference to FIGS. The wire 44 of the sensor 42 is electrically connected to the wiring pattern of the flexible circuit board 25 by the solder 24 as in the embodiment described with reference to FIGS.

The embodiment shown in FIG. 10 is different from the above-mentioned embodiment only in that the wire pulled out from the motor is the wire of the sensor, and in the case of this embodiment as well, the same effects as the above-mentioned embodiment Play.

Although the illustrated embodiment is configured as a magnetic disk drive motor, the application of the motor is not limited to a specific application and can be applied as a motor for all purposes. .. Also, the type of motor is not limited, and it may be an outer rotor type motor, an inner rotor type motor, a cored motor, a coreless motor, a brushed motor or a brushless motor. It doesn't matter. Furthermore, the present invention is applicable not only to motors but also to generators and other rotary electric machines in general.

[0023]

[Effect of the device]

 According to the invention as set forth in claim 1, since the printed circuit board that is drawn out to the outside of the rotary electric machine is arranged in the cutout portion of the bottom portion of the frame, the thickness of the printed circuit board does not add to the thickness of the rotary electric machine. The size can be reduced. Therefore, it is possible to reduce the size of the rotary electric machine while maintaining high characteristics. Further, since it is not necessary to pull out from the rotating electric machine while bending the printed circuit board, the printed circuit board can be pulled out to the outside of the rotating electric machine in a flat plate shape with the posture of being arranged in the cutout portion. The printed circuit board will not be housed and will not float from the frame. From this point as well, it is possible to reduce the size of the rotary electric machine while maintaining high characteristics. Further, since it is not necessary to bend the printed circuit board to pass through the hole of the frame, it is possible to prevent the conductive portion of the printed circuit board from being cut or the insulation to be defective.

According to the second aspect of the present invention, the frame is formed with a cutout portion reaching the side surface, and the printed board is drawn out from the hole formed in the bottom surface of the frame through the cutout portion into a substantially flat plate shape. Therefore, the printed circuit board can be applied not only to the flexible printed circuit board but also to a flexible printed circuit board.

According to the invention of claim 3, in addition to the invention of claim 2, since an insulator for insulating the frame and the winding is provided on the printed circuit board, the insulator is separately provided as a single component. There is an advantage that the number of parts can be reduced because it is not necessary to provide them.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of a printed circuit board mounting structure of a rotary electric machine according to the present invention.

FIG. 2 is a partially sectional front view showing the outer appearance of the above embodiment.

FIG. 3 is a bottom view of a main part of the above embodiment.

FIG. 4 is a front sectional view showing an enlarged main part of the above embodiment.

FIG. 5 is a front sectional view showing another embodiment of the printed circuit board mounting structure of the rotating electric machine according to the present invention.

FIG. 6 is a side view showing the outer appearance of the above embodiment.

FIG. 7 is a bottom view of the above embodiment.

FIG. 8 is a plan view of the printed circuit board according to the embodiment.

FIG. 9 is an enlarged front sectional view of the same printed circuit board.

FIG. 10 is a front sectional view showing still another embodiment of the printed circuit board mounting structure of the rotating electric machine according to the present invention.

FIG. 11 is a front cross-sectional view showing an example of a conventional printed circuit board mounting structure of a rotating electric machine.

FIG. 12 is a plan view of a printed circuit board in the above conventional example.

[Explanation of symbols]

 6 Frame 11 Printed Circuit Board 17 Wire 20 Cutout 23 Printed Circuit Board 26 Insulator 36 Cutout 37 Hole 40 Printed Circuit Board 44 Wire

Claims (3)

[Scope of utility model registration request] 1. A cutout portion is provided in a bottom portion of a frame of a rotary electric machine, and a printed board that is drawn out of the rotary electric machine is arranged in the cutout portion, and a wire drawn out from the rotary electric machine is connected to the printed board. A printed circuit board mounting structure for a motor characterized by being provided. 2. The cutout portion is formed to reach a side surface of the frame and wider than the printed circuit board, and the cutout portion has a hole penetrating the bottom surface of the frame and wider than the printed circuit board. The printed circuit board mounting structure for a motor according to claim 1, wherein the printed circuit board is drawn out from the hole in a substantially flat plate shape. 3. The printed circuit board mounting structure for a motor according to claim 2, wherein the printed circuit board is provided with an insulator that insulates the frame and the winding of the rotary electric machine.