JPH0723029Y2 - Stepping motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a stepping motor used for driving a head of a floppy disk device.

[Conventional technology]

5 to 8 show a stator portion used in a conventional stepping motor. The stator 1 shown in FIG. 1 is integrally formed on the inner circumference of a stator core 3 covered with slot insulation 2 on both upper and lower sides. Winding 5 on a plurality of salient poles 4 protruding
It is formed by winding. A circuit board 6 to which the ends of the winding wire 5 and lead wires are connected to one surface side of the stator 1.
Is fixed. Then, the fixing of the circuit board 6 is
The circuit board 6 is placed so as to be supported by the coil portion wound around the salient poles 4, and the outer peripheral edge of the board 6 is integrally projected at predetermined intervals to the slot insulation 2 on the board fixed side. The locking claws 8 provided on the tip ends of the plurality of fixing projections 7 are locked so as to prevent them from coming off. In the figure, 9 is a protective insulating tape.

[Problems to be solved by the invention]

However, in the conventional circuit board mounting structure in the stepping motor, since the circuit board 6 is placed on the coil portion wound around the salient pole 4, the thickness H (see FIG. 5) of the stator portion is large, Therefore, there has been a problem that it becomes an obstacle when downsizing the entire stepping motor.

Therefore, an object of the present invention is to reduce the size, to easily and reliably attach the circuit board to the stator, and to easily set the winding machine when winding the wire. To get a stepping motor.

[Means for solving problems]

According to the present invention, a stator core integrally formed with a plurality of salient poles on its inner circumference is covered with a pair of synthetic resin slot insulation from both sides in the thickness direction, and the salient poles covered with the slot insulation are wound. The present invention is applied to a stepping motor including a stator formed by winding a coil and a circuit board fixed to one surface side in the thickness direction of the stator and connected to the ends of the windings.

And, in order to achieve the above-mentioned object, those formed by the same molding die for the pair of slot insulations are used, and at the tip portions of the salient pole cover portions that cover the tip portions of the salient poles of the slot insulation. A board supporting portion is provided, and a fixing claw that is separated from the board supporting portion in the thickness direction of the stator core is provided at a tip end portion of every other salient pole covering portion. Positioned within the thickness width of the coil part wound around the salient pole, the circuit board is supported and fixed to the stator by sandwiching the outer peripheral edge of the circuit board with the board support part and the fixing claw, and A convex portion is provided on a part of the outer peripheral edge so as to enter between the adjacent salient poles and engage with each other.

[Action]

According to the stepping motor having the above structure, the circuit board is fixed to the stator by sandwiching the outer peripheral edge of the circuit board with the board supporting portion and the fixing claw provided at the salient pole tip portion of the stator core, and thus the circuit board is salient. Combined with the fact that the circuit board can be mounted without being placed on the coil part that is wound around the board part and the fixing claws are positioned within the thickness width of the coil part, It can be installed without protruding outside. Therefore, it is possible to prevent the circuit board mounted on the one surface side of the stator in the thickness direction from increasing the thickness of the stator portion.

Also, the circuit board is sandwiched between the board supporting portion and the fixing claw,
The stator is prevented from coming off in the thickness direction, and the protrusions of the circuit board and the salient poles of the stator engage to prevent the circuit board from rotating, so that the circuit board can be securely attached to the stator. You can

Further, the circuit board is supported on the board supporting portion by overriding the fixed claws, but since the fixed claws are provided on every other salient pole covering portion, the resistance when crossing over the fixed claws is small and easy. A circuit board can be attached to.

Moreover, since the pair of slot insulations provided in the stator are molded with the same molding die, the molding cost is low, and the stator core with the pair of slot insulations attached is set in the winding machine to wind the coil. Since the directionality at the time of setting is eliminated when winding the wire around the salient pole, it can be easily set on the winding machine. Therefore, the cost can be reduced.

〔Example〕

1 to 4 showing an embodiment of the present invention, reference numeral 11 denotes a motor frame, which is a flat metal frame member 12 used as a mounting plate for equipment and a metal having a shallow container shape. It is formed by connecting the frame-making member 13 with means such as welding. A bearing mounting portion 14 is provided at a substantially central portion of the frame member 12 so as to project to the outside of the motor frame 11, and a bearing 15 is built in the mounting portion 14. Furthermore, the motor frame is also provided in the substantially central portion of the other frame member 13.
A bearing mounting portion 16 is provided so as to project inward from the bearing 11 and faces the bearing mounting portion 14, and the mounting portion 16 also has a bearing 17 built therein.

Reference numeral 18 in FIG. 4 denotes a rotor in which a rotor core 20 and a rotor magnet 21 are mounted on a rotary shaft 19, and the rotary shaft 19 is rotatably supported over the bearings 15 and 17. Then, one end of the rotary shaft 19 penetrates the bearing mounting portion 14 and projects to the outside of the motor frame 11, and a capstan 22 is attached to the tip portion thereof. A steel belt (not shown) is wound around the capstan 22 and screwed. This belt is connected to a carriage carrying a magnetic head, so that the motor of this embodiment can be used as a drive source for a head access mechanism of a floppy disk device.

A stator 23 is built in the motor frame 11 so as to surround the rotor 18. The stator 23 has slot insulations 25 and 26 on both upper and lower sides of a substantially ring-shaped stator core 24 formed by laminating a plurality of silicon steel plates, and has a substantially T shape integrally formed on the inner circumference of the core 24. A plurality of letter-shaped salient poles 27 are formed by winding windings 28, respectively.

The slot insulations 25 and 26 are molded products of synthetic resin and obtained from the same mold. And slot insulation 25,
Reference numeral 26 denotes a salient pole covering portion that covers the salient pole 27 except the tip end surface thereof.
29, and a substrate support 30 is provided at the tip of the cover 29. The substrate support portion 30 is composed of, for example, a step portion, and is arranged within the thickness width A (see FIG. 1) of the coil portion wound around the salient pole 27. In addition, a fixed claw 31 is provided at the tip of every other salient pole cover portion 29 so as to face the substrate support portion 30 at a distance from the substrate support portion 30 in the thickness direction.

A ring-shaped circuit board 32 is formed on one surface of the stator 23.
The outer peripheral edge is placed and supported on the substrate supporting portion 30, and this state is achieved by the engagement with the fixed claw 31. That is, the circuit board 32 has the outer peripheral edge of the board supporting portion 30.
It is attached to one surface side of the stator 23 by being sandwiched between it and the fixed claw 31. The conductive wire of the circuit board 32 has the winding 28
The terminal and the lead wire 33 are connected to each other by soldering. Further, in this embodiment, the circuit board
A part of the outer peripheral edge of 32 is provided with a convex portion 34 which engages with the interval B (see FIG. 3) between the tips of the adjacent salient poles 27. The engagement between the interval B and the convex part 34 is provided. The circuit board 32 after assembly is prevented from rotating.

Reference numeral 35 in FIG. 4 is a coil spring.

The circuit board 32 is attached to the stator 23 provided in the stepping motor having the above structure from the state shown in FIG.
It suffices to push 32 so that it extends between the tips of salient poles 27 on one surface side of stator 23. Then the circuit board
At the same time that the outer peripheral edge of 32 rides over the fixed claw 31, it is placed on the substrate supporting portion 30 located below this, and its supporting state is fixed by the engagement with the fixed claw 31. Thus, the circuit board 32 can be easily supported and fixed to the stator 23. In addition, in order to make the above fixed state more reliable,
The tip portion of the salient pole covering portion 29 and the outer peripheral edge of the circuit board 32 may be bonded with an adhesive.

And, the stator part assembled as described above,
As described above, the substrate support portion 30 provided at the tip end portion of the salient pole cover portion 29 of the slot insulation 25 that covers the salient pole 27 of the stator core 24.
Since the circuit board 32 is supported and fixed by sandwiching the outer peripheral edge of the circuit board 32 with the fixing claw 31, the winding of the stator 23 is prevented without placing the circuit board 32 so as to overlap the coil portion wound around the salient pole 27. It can be installed inside the line 28. Further, in combination with this, since the substrate supporting portion 30 and the fixing claw 31 are positioned and provided within the thickness width A of the coil portion,
The circuit board 32 can be attached without protruding outside from the thickness width A of the coil portion.

That is, it is possible to prevent the circuit board 32, which is supported and fixed to one surface side of the stator 23, from causing the height of the stator portion to increase, and thereby to downsize the entire stepping motor. Also the circuit board
The board 32 is sandwiched between the board supporting portion 30 and the fixed claw 31, and is prevented from coming off in the thickness direction of the stator 23. Since the circuit board 32 is prevented from rotating, the circuit board 32 can be securely attached to the stator 23. Further, the circuit board 32 is supported on the board supporting portion 30 by overriding the fixed claws 31, and the fixed claws 31 are provided every other salient pole covering portion.
Since it is provided at 29, the resistance when riding over the fixed claw 31 is small, so that the circuit board 32 can be easily attached to the stator 23. In addition, since the pair of slot insulations 25 and 26 included in the stator 23 are molded by the same molding die, the molding cost is low, and the stator core 24 to which the pair of slot insulations 25 and 26 are attached is attached.
When the coil 28 is set on a winding machine (not shown) and the winding 28 is wound around the salient pole 27, the directionality of the setting can be eliminated and the winding can be easily set on the winding machine. Therefore, not only the molding cost but also the cost required for the setting work on the winding machine can be reduced, so that the cost of the entire motor can be reduced.

Although the above-mentioned one embodiment is configured as described above, in carrying out the present invention, the stator core, the salient poles, the windings, the slot insulation, the salient pole covering portion, the substrate supporting portion, Specific structure such as fixed claw, circuit board, convex part,
The shape, position, etc. are not limited to the above-mentioned embodiment,
Of course, it can be configured and implemented in various modes.

[Effect of device]

According to the present invention, which has the configuration described in the above-mentioned utility model registration claim as a gist, the circuit board can be arranged within the thickness width of the coil portion without being placed on the coil portion of the stator. It is possible to prevent the thickness of the stator portion from being increased by the circuit board attached to the one surface side, so that the motor can be downsized. Further, the circuit board is prevented from coming off in the thickness direction of the stator by the board supporting portion and the fixing claw, and the circuit board is prevented from rotating by the engagement between the convex portion of the circuit board and the salient pole portion of the stator. The board can be securely attached to the stator. Further, since the fixed claws that the circuit board rides over are provided in every other salient pole covering portion to reduce the resistance when climbing over the fixed claws, the circuit board can be easily attached. In addition, a pair of slot insulations can be molded with the same molding die to reduce the molding cost and eliminate the directionality when setting the stator core with the pair of slot insulations attached to the winding machine. Since the cost required for the setting work on the winding machine can be reduced, there is a practical effect that the cost of the entire motor can be reduced.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a sectional view taken along the line I--I in FIG. 3, and FIG. 2 is an exploded perspective view of a stator and a circuit board. 3 is a plan view of a part of the stator portion, and FIG. 4 is a vertical sectional view of the whole. 5 to 8 show a conventional example, FIG. 5 is a side view of the stator portion, FIG. 6 is a bottom view of the stator portion, and FIG. 7 is in FIG.
A sectional view taken along the line VII-VII, and FIG. 8 is VIII-VIII in FIG.
It is sectional drawing which follows the line. 23 ... Stator, 24 ... Stator core, 25, 26 ... Slot insulation, 27 ... Salient pole, 28 ... Winding, 29 ... Salient pole covering part, 30 ... Board supporting part, 31 ... Fixing claw, 32 ... Circuit board, 34 ... Convex portion, A ... Thickness width of coil portion.

Claims (1)

[Scope of utility model registration request] 1. A stator core integrally formed with a plurality of salient poles on its inner periphery is covered with a pair of slot insulation made of synthetic resin from both sides in the thickness direction, and the salient poles covered with the slot insulation are wound. A stepping motor comprising a stator formed by winding a wire and a circuit board fixed to one surface side in the thickness direction of the stator and connected to the ends of the windings, wherein the pair of slot insulations are molded by the same molding die. And a substrate supporting portion is provided at the tip portion of each salient pole cover portion that covers the tip portion of the salient pole of the slot insulation, and the substrate is provided at the tip portion of every other salient pole cover portion. A fixed claw which is separated from the support portion in the thickness direction of the stator core is provided, and the substrate support and the fixed claw are positioned within the thickness width of the coil portion wound around the salient pole, and the substrate support is provided. And fixed nails The circuit board is supported and fixed to the stator with the outer peripheral edge of the circuit board sandwiched therebetween, and a convex portion which is inserted between the adjacent salient poles to be engaged with is provided on a part of the outer peripheral edge of the circuit board. Stepping motor characterized by.