JP2579341Y2 - Printed circuit board mounting structure of rotating electric machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board mounting structure of a rotating electric machine for connecting the rotating electric machine to an external circuit.

[0002]

2. Description of the Related Art FIG. 11 shows an example of a mounting structure of a printed circuit board for connecting a rotating electric machine and an external circuit, which has been conventionally considered.
As shown in FIG. This example is an example of a motor. 11 and 12, a bearing 139 projecting upward is provided at the center of the frame 126 of the motor, and a stator core 125 is fitted and fixed to the outer peripheral side of the bearing 139. The stator core 125 has a plurality of salient poles radially, and a stator coil 124 is wound around each salient pole. Frame 1
26 is formed in the shape of a dish,
A flexible printed circuit board 132 is fixed to the bottom of. From the flexible printed circuit board 132, FIG.
As shown in FIG. 2, a drawer 131 extends to the outside. The drawer 131 is drawn out of the motor through a window 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.
37 is connected to an external circuit through a conductive pattern formed on the flexible printed board 132.

[0003] The outer peripheral surface of the stator core 125 is opposed to the inner peripheral surface of a rotor magnet integral with a rotatable rotor case (not shown) with a certain gap. The frame 126 is made of a metal such as aluminum or iron.

[0004]

According to the conventional printed circuit board mounting structure of the motor, the flexible printed circuit board 132 is mounted inside the motor, and the lead-out portion 131 of the flexible printed circuit board 132 is moved out of the window hole 135 of the frame 126 to the outside. Since the drawer 131 needs to be bent and passed through the window 135 while being bent, the drawer 131 is cut at the edge of the window 135 of the frame 126 made of metal. There is a problem that the window hole 135 is formed small for the sake of sealing, so that the window hole 135 easily comes into contact with the conductor of the printed circuit board 132 and insulation failure easily occurs. Further, as shown by reference numeral G in FIG. 11, the drawer portion 131 floats from the bottom surface of the frame 126, and the frame 126, the flexible printed circuit board 132, the insulating material thereof, and the solder 138.
Therefore, if the size of the entire motor is constant, it is necessary to reduce the size of the core 125 and the like, so that good characteristics cannot be obtained, which is not suitable for downsizing the motor. Was.

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 an outer end surface of a stator yoke as disclosed in Japanese Patent Application Laid-Open No. 57-202867. However, according to such a configuration, there is a disadvantage that the axial dimension of the motor is increased by the thickness of the flexible printed circuit board, and the components mounted on the flexible printed circuit board are exposed and easily damaged. There are difficulties.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and can prevent a printed circuit board conductor from being cut off and insulation failure at a portion drawn out from a rotating electric machine. By eliminating the floating of the printed circuit board in the part and fixing the printed circuit board within the limited thickness of the rotating electric machine, the printed circuit board mounting structure of the rotating electric machine that enables downsizing of the rotating electric machine while maintaining high characteristics The purpose is to provide.

[0007]

In order to achieve the above object, according to the present invention, the rotor is mounted on the frame.
A rotating electric machine arranged on one side, provided with a cutout having a bottom on the other side of the frame of the rotating electric machine, a printed circuit board drawn out of the rotating electric machine is arranged in the cutout portion, and is drawn from the rotating electric machine. The connected wire was connected to a printed circuit board.
In the invention according to claim 2, the notch is formed to reach the side surface of the frame and to be wider than the printed board, and a hole wider than the printed board is formed in the notch by penetrating the bottom of the frame. 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 circuit board is provided with an insulator for insulating the frame and the windings of the rotating electric machine.

[0008]

According to the first aspect of the present invention, the printed board is disposed in the cutout at the bottom of the frame, and the thickness of the printed board does not add to the thickness of the rotating electric machine. The printed circuit board may be pulled out of the rotating electric machine while keeping the posture of the printed circuit board, and it is not necessary to bend the printed circuit board and pass it through the hole of the frame. Claim 2
According to the described invention, when the printed circuit board is arranged in the hole on the bottom surface of the frame, the printed circuit board is drawn out of the side surface of the frame in a substantially flat shape through the cutout portion reaching the side surface of the frame. According to the third aspect of the present invention, the insulation between the frame and the windings of the rotating electric machine is insulated by the insulator provided on the flint board.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, with reference to the drawings. Here, a motor will be described as an example. FIG.
In the motor, a cup-shaped frame 6 of a motor is integrally formed with a cylindrical bearing portion 13 projecting upward at a central portion thereof, and two ball bearings 3 and 8 are provided in the bearing portion 13. Are fitted and fixed. A shaft portion 12 integrally formed at the center of the cup-shaped rotor case 1 is 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 motor for driving a magnetic disk, and the rotor case 1 also serves as a hub. That is, a magnetic disk is fitted on 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 periphery of the cup-shaped rotor case 1. A stator core 5 is fitted and fixed to an outer peripheral portion of the bearing portion 3. Stator core 5 is formed of a laminated core and has a plurality of salient poles in a radial pattern. The 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 certain gap. An insulating seal 9 is attached to a surface of the frame 6 facing the stator winding 4.

As shown in detail in FIGS. 2 to 4, a notch 20 is provided at the bottom of the frame 6, and a base of the flexible printed circuit board 11 drawn out of the motor is provided on the ceiling surface of the notch 20. 14 is fixed.
As a fixing means of the base portion 14 of the flexible printed circuit board 11, an adhesive or other appropriate means may be adopted. Here, it was fixed using a double-sided adhesive tape. A hole 15 is formed in the frame 6 to allow the stator core 5 disposed side to communicate with the notch 20. A wire 17 drawn from the stator winding 4 is formed in the hole 15 and the hole formed in the flexible printed board 11. After being routed through, the solder 16 is applied to predetermined soldering lands of the flexible printed circuit board 11.
Connected by Flexible printed circuit board 1
1 is a frame 6 with its base 14 in the same plane.
From the side. Flexible printed circuit board 1
1, a predetermined conductive pattern is formed, and the stator winding 4 is electrically connected to an external circuit through the conductive pattern.

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

According to the embodiment described above, the frame 6
Since the flexible printed board 11 drawn out of the motor is arranged in the cutout 20 at the bottom of the motor, the thickness of the flexible printed board 11 does not add to the thickness of the motor, and the thickness of the motor can be reduced.
Further, it is not necessary to draw out the flexible printed circuit board 11 from the motor while bending the flexible printed circuit board 11, and the flexible printed circuit board 11 may be pulled out of the motor in a flat plate shape while maintaining the posture arranged in the cutout portion 20. The flexible printed circuit board 11 which is accommodated in the cutout portion 20 and does not float from the motor frame 6 is also prevented, and the size of the motor can be reduced from this point as well. Furthermore, since it is not necessary to bend the flexible printed circuit board 11 and pass it through the hole of the frame, it is possible to prevent the conductive portion of the flexible printed circuit board 11 from being cut or insulation failure.

Next, a modified embodiment of the present invention shown in FIGS. 5 to 9 will be described. In FIG. 5, the motor frame denoted by reference numeral 6 has a cylindrical bearing portion 13 on the inner peripheral side with a short outer shape. 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 bearing portion 13. The stator core 5 has a plurality of salient poles, and the armature winding 4 is wound around each salient pole. The distal 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 at an appropriate interval. Since the parts described above are substantially the same as those of the above embodiment, the same components are denoted by the same reference numerals.

5 to 9, a bottom portion 6a of the frame 6 of the motor is formed with a notch portion 36 extending to the side surface of the frame 6 near the outer peripheral edge thereof. A hole 37 communicating with the inside of the frame 6 is formed by penetrating the frame 6a. A flexible circuit board 25 is provided 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 thereof is a protruding portion 25a protruding in a tongue shape in the outer peripheral direction. The base of the protruding portion 25a, that is, The portion connected to the protruding portion 25a 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 bonded to the flat ceiling surface 23 so that the flexible circuit board 25 protrudes following the wide portion 25b. Part 25a
Are drawn out of the motor in the form of a flat plate.

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 from the wide portion 25b to the protruding portion 25a of the flexible circuit board 25. Each of the wiring patterns 34 is
The end on the protruding portion 25a side and the end on the wide portion 25b side are covered with the insulator 26 except for the end on the a side and a part of the end on the wide portion 25b side. Are terminal portions. The wide portion 2 of each wiring pattern 34
The wire 17 drawn from the stator winding 4 is connected to the terminal portion on the 5b side by solder 24 after passing through the cutout portion 28 on the inner peripheral edge of the flexible circuit board 25. The amount of swelling of the solder 24 is determined by the notch 36 of the solder 24.
It does not protrude. Each wiring pattern 34
It can be connected to an external circuit using the terminal portion on the side of the protruding portion 25a. The ring-shaped insulator 26 of the flexible circuit board 25 is fitted to the outer peripheral portion of the bearing portion 13 of the frame 6 and is disposed on the inner bottom of the frame 6, that is, between 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 as shown in FIG. The peripheral part is adhered to the frame 6 by an adhesive 32. The outer periphery, the hole, and the notch of the flexible circuit board 25 exposed from the hole 37 of the frame 6 are sealed with an adhesive.

In the case of the embodiment described above, the frame 6
Since the flexible printed circuit board 25 drawn out to the outside of the motor is arranged in the cutout 36 at the bottom of the above, the same effect as in the above embodiment can be obtained. Further, the insulator 26 for insulating the frame 6 from the stator winding 4 is connected to the flexible circuit board 2.
5, it is not necessary to separately provide an insulator as an insulator as in the above-described embodiment, so that there is an advantage that the number of parts can be reduced. In addition,
In the above embodiment, since the flexible circuit board 25 is pulled out from the motor in a substantially flat shape, the flexible circuit board 2
Instead of 5, it is also possible to use a circuit board having small flexibility or inflexibility.

In each of the embodiments described so far, the wire drawn from the inside of the motor has been described as a wire drawn from the stator winding. However, 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 disposed inside. FIG. 10 shows such a modified embodiment, in which a wire 44 drawn from a rotor rotational position detection sensor 42 is connected to an external circuit. In FIG. 10, a sensor 42 composed of a Hall element or a magnetoresistive element is fixed to the inner bottom of the frame 6 and is arranged to detect a 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 bonding with a configuration similar to that of the embodiment described with reference to FIGS. The wires 44 of the sensor 42 are electrically connected to the wiring pattern of the flexible circuit board 25 by the solder 24 in the same manner as in the embodiment described with reference to FIGS.

The embodiment shown in FIG. 10 is different from the above-described embodiment only in that the wire drawn from the motor is the sensor wire. In this embodiment, the same operation and effect as in the above-described embodiment are obtained. To play.

Although the illustrated embodiment is configured as a magnetic disk drive motor, the use of the motor is not limited to a specific use, but can be applied to a motor for any use. Also, the type of the motor is not limited, and may be an outer rotor motor, an inner rotor motor, a cored motor, a coreless motor, a brushed motor, or a brushless motor. It does not matter. Further, the present invention is applicable not only to motors but also to generators and other rotating electric machines in general.

[0023]

According to the first aspect of the present invention, the rotor is
In the rotating electric machine arranged on one side of the frame , since the printed board drawn out to the outside of the rotating electric machine is arranged in the bottomed notch on the other side of the frame, the thickness of the printed board does not add to the thickness of the rotating electric machine, The thickness of the rotating electric machine can be reduced. Therefore, downsizing of the rotating electrical machine can be achieved while maintaining high characteristics. Also, it is not necessary to pull out the printed circuit board from the rotating electric machine while bending the printed circuit board, and the printed circuit board may be pulled out of the rotating electric machine in a flat plate shape with the posture arranged in the notch,
The printed circuit board is accommodated in the cutout portion, and the printed circuit board does not float from the frame. In this regard, the size of the rotating electric machine can be reduced while maintaining high characteristics. Further, since it is not necessary to bend the printed circuit board and pass it through the hole of the frame, it is possible to prevent the conductive portion of the printed circuit board from being cut or insulation failure.

According to the second aspect of the present invention, a notch is formed in the frame so as to reach the side surface, and the printed circuit board is drawn out in a substantially flat shape from the hole formed in the bottom of the frame via the notch. The printed circuit board can be applied not only to a flexible printed circuit board but also to a non-flexible printed circuit board.

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

[Brief description of the drawings]

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

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

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

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

FIG. 7 is a bottom view of the embodiment.

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

FIG. 9 is an enlarged front sectional view of the 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 sectional view showing an example of a conventional printed circuit board mounting structure for a rotating electric machine.

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

[Explanation of symbols]

 6 Frame 11 Printed circuit board 17 Wire 20 Notch 23 Printed circuit board 26 Insulator 36 Notch 37 Hole 40 Printed circuit board 44 Wire

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 5/22 H02K 3/50

Claims (3)

(57) [Scope of request for utility model registration] 1. A rotor is disposed on one side of a frame.
A rotating electric machine, on the other side of the rotating electric machine frame
A motor having a cutout with a bottom, a printed board drawn out of the rotating electric machine disposed in the cutout, and a wire drawn from the rotating electric machine connected to the printed board. PCB mounting structure. 2. The notch has a hole extending to the side surface of the frame and wider than the printed circuit board, and having a hole formed through the bottom of the frame and wider than the printed circuit board. 2. A printed circuit board mounting structure for a motor according to claim 1, wherein said printed circuit board is drawn out in a substantially flat shape from said hole. 3. The printed circuit board mounting structure for a motor according to claim 2, wherein an insulator for insulating the frame and the windings of the rotating electric machine is provided on the printed circuit board.