JPH08196068A - Stepping motor - Google Patents

Abstract

PURPOSE: To obtain a stepping motor in which a printed wiring board is prevented from falling at automatic soldering. CONSTITUTION: A slot insulation member 7a disposed in the slot of stator is provided with a terminal having a connection part projecting from the end face of the stator along the axial direction thereof and a stop part 13b formed by bending the connection part at the forward end part thereof. The windings of coils 16a-16h are connected, at the end parts thereof, with the connection part of the terminal. A printed wiring board is provided with a connection hole (engaging part) 23 for inserting the stop part 13b of the terminal and having a hole fringe part (engaging fringe) being engaged with the stop part 13b. The terminal is inserted into the connection hole 23 and the printed wiring board is fixed to the stator while being clamped by the 13b and the tongue 15 (abutting part) of the slot insulating member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stepping motor used for controlling office automation equipment, factory automation equipment, computer terminal equipment and peripheral equipment.

[0002]

2. Description of the Related Art In a conventional stepping motor, a terminal of a winding of a coil disposed on a plurality of salient poles of a stator and a signal line for supplying a predetermined input signal to the coil, that is, a lead wire are connected by a printed wiring. It is generally performed through a substrate. And as a connection method when connecting through this printed wiring board, one is to provide a connection hole into which the winding end of the coil is inserted in the printed wiring board and insert the end of the winding into this connection hole. There is a method of connecting by soldering. However, in this case, when the wire diameter of the coil winding changes, the size of this connection hole also has to be changed. In other words, if the connection hole is formed to be large to accommodate windings of various wire diameters, for example, when a large connection hole and a winding with a small wire diameter are combined, the windings inserted into the connection hole Since there is a large gap between the outer circumference and the inner circumference of the connection hole, there is a problem that reliable soldering does not occur. Conversely, if the wire diameter of the winding is as large as the connection hole, the heat capacity of the winding will increase. Because it gets bigger,
This is because the printed wiring is peeled off from the substrate due to heat during soldering, and thus the connection hole must be formed in accordance with the wire diameter of the coil winding as described above.
Further, the above method has a problem that the automatic soldering process cannot be performed.

In order to solve the problems in the above method and to enable automatic soldering processing, a circular hole is provided in the printed wiring portion of the printed wiring board, and a slot insulating member provided on the stator is used for the stator. Provide a rod-shaped terminal that protrudes in the axial direction and has a diameter that matches the round hole, wrap the terminal of the coil winding around this terminal and connect it, then insert this rod-shaped terminal into the round hole and then perform automatic soldering processing There is a method of soldering.
The structure of a conventional stepping motor for connecting the winding terminal of the coil and the printed wiring of the printed wiring board, that is, the thin film conductor by this method will be described with reference to FIGS.

As shown in FIG. 6, a stepping motor (hereinafter simply referred to as a motor) 100 is a stator 10.
1. Brackets 102 and 10 mounted on both ends of the stator 101 with mounting members such as screws (not shown) and provided with bearings 102a and 103a in the center
3. A rotor (not shown) rotatably supporting the rotating shaft 104 on the bearings 102a and 103a.

As shown in FIG. 7, a plurality of salient poles 105a to 105h are formed on the stator 101, and slots 106a to 106h are formed between the salient poles 105a to 105h.
Further, the stator 102 has the brackets 102, 1
An insertion hole 130 through which a fixture for attaching 03 is inserted is provided.

Slot insulating members 107a and 107b are provided in the slots 106a to 106h. The slot insulation 107a is made of a thermoplastic synthetic resin, and as shown in FIG.
Convex poles 105a to 1 excluding the surface of h facing the rotor
A projecting pole insulating portion 108 that covers the periphery of 05h and insulates it, an annular insulating portion 109 that is formed integrally with this projecting pole insulating portion 108 and covers and insulates the inner peripheral surface of the slot, and one end of this annular insulating portion 109. A flange portion 111 for forming a step portion 110 on an outer periphery of the side and positioning the end portion of the stator.
And an annular wall 112 formed on the outer peripheral portion of the flange portion 111. The salient pole insulating portion 108 is open at the side opposite to the side where the flange portion 111 is formed, that is, the lower end side in FIG. 9, and the salient poles 105a to 105h are connected to the salient pole insulating portion 108 from the end surface side of the stator 101. The flange portion 1 while being positioned inside the
11 is inserted until it comes into contact with the end surface of the stator 101, and is disposed in the slots 106a to 106h.

When the flange portion 111 is inserted into the end surface of the stator 101 until the slot insulating member 107a is inserted, the end edge 109 at the tip in the inserting direction is inserted.
The symbol a is located at an intermediate position in the axial direction of the stator 101. The stepped portion 110 has a rod-shaped terminal 113.
Are integrally fixed, and a mounting protrusion 114 made of the same material as the slot insulating member 107a is integrally formed on the inner periphery of the annular insulating portion 109.

A tongue piece 115 is formed on the inner peripheral side of the salient pole insulating portion 108, and the tongue piece 115 is formed on the salient pole insulating portion 1.
The coil winding of the coil wound in the coil housing groove 108a of No. 08 is regulated so as not to protrude from a predetermined portion.

The slot insulation 107b is formed in the same shape as 107a except that the terminal 113 and the mounting projection 114 are not provided. The slots 106a to 10 of the slot insulating member 107b
6h is arranged by inserting from the other end side of the stator 101 in the same manner as the slot insulating member 107a. When both slot insulating members 107a and 107b are inserted and arranged from both end sides of the stator 101, the end edge 109a of the annular insulating portion 109 of the slot insulating member 107a and the end of 107b corresponding to this end edge 109a. The edge (not shown) is abutted.

And, the slots 106a and 106b
After arranging the slot insulating members 107a and 107b in
A coil 11 is formed by winding a winding wire around each of the salient poles 105a to 105h, and winding the end or end of the winding wire around the terminal 113 and connecting the terminal 113 to the terminal 113 by soldering.
6a to 116h are arranged on the stator 101.
The coils 116a to 116h are arranged on the stator 101 in which the coils 116a to 116h are arranged in this manner.
A printed wiring board 120 for connecting h to the lead wire 117 is attached.

The printed wiring board 120 has an insertion hole 120a formed in the center thereof for inserting the rotor therein and a predetermined printed wiring 121.
Further, the printed wiring board 120 is formed with a predetermined number of connection holes 122 into which the terminals 113 provided in the slot insulating member 107a are inserted and a plurality of mounting holes 124 into which the mounting protrusions 114 are inserted.

Then, the terminal 113 and the mounting protrusion 114 of the slot insulating member 107a are attached to the printed wiring board 120.
After being inserted into the connection hole 122 and the mounting hole 124, heat is applied to the tip end portion of the mounting projection 114 to increase the diameter of the head portion 114.
After forming a, the printed wiring board 120 is attached to the slot insulating member 107a, that is, the stator 101 by preventing the printed wiring board 120 from being pulled out from the mounting hole 124.

In this state, the terminals 113 and the printed wirings are automatically soldered, which is well known in the art.
The surface side on which the printed wiring 121 is formed is immersed in the molten solder in the solder bath. At this time,
In some cases, the head portion 114a of the mounting protrusion 114 is melted, the mounting protrusion 114 and the terminal 113 are removed from the mounting hole 124 and the connection hole 122 of the printed wiring board 120, and the printed wiring board 120 becomes the slot insulating member 1.
07a, that is, there is a problem that the stator 101 will fall off.

[0014]

As described above, the terminal 113 is provided on the slot insulating member 107a, and the terminal 11 is provided.
A terminal of the coil winding is wound around 3 and connected by soldering, and this terminal 113 is inserted into the connection hole 122 of the printed wiring board 120 for automatic soldering processing. Although it has the advantage of being able to handle coil windings of various wire diameters and being capable of automatic soldering processing, the problem that the printed wiring board 120 falls off from the stator 101 during automatic soldering processing as described above. In addition, when the printed wiring board 120 is attached to the stator 101, the terminals 113 and the attachment protrusions 114 of the slot insulating substrate 107a are included.
Each of them has to be inserted after being aligned with the connection hole 122 and the mounting hole 124 of the printed circuit board 120, and there is a problem that the mounting work of the printed circuit board 120 to the stator 101 is not easy.

[0015]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems of the prior art, and is provided in a stator having a plurality of salient poles and in a slot formed between the salient poles as well as in the stator. A slot insulating member having an abutting portion formed so as to project from the end surface; a connecting portion provided on the slot insulating member and protruding from an end edge of the stator in the axial direction of the stator; and a tip portion of the connecting portion. A terminal having a locking portion formed by bending, a coil disposed at the salient pole through the slot insulating member and having a winding end connected to a connecting portion of the terminal, A print in which an engaging portion is inserted and an engaging portion having an engaging edge that engages with the engaging portion is provided, and the engaging edge is held by the engaging portion and the contact portion of the slot insulating member. Wiring board A bracket having a bearing with are provided at both ends of the stator is obtained by a stepping motor with a rotatably supported by the rotor bearing.

[0016]

Since the present invention is configured as described above, it can be applied to a coil using windings of various wire diameters with one type of printed wiring board, and the printed wiring of the printed wiring board and the coil can be automatically soldered. The connection can be made by the attaching process, and the printed wiring board can be prevented from coming off from the stator during the automatic soldering process. Also, the printed wiring board can be easily attached to the stator.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
It will be described based on. Note that the configuration of the motor is the same as the configuration of the motor described in the above-mentioned conventional example, and the description thereof will be omitted.

In the figure, reference numeral 1 is a stator, and a plurality of salient poles 5a to 5h are formed on the stator 1, and a slot 6a is provided between each salient pole 5a to 5h.
Through 6h are formed. Further, the stator 1 is provided with an insertion hole 30 for inserting a fixture (not shown) for attaching a bracket (not shown). And
A slot insulating member 7a is provided in each of the slots 6a to 6h.
And 7b are provided. The slot insulation 7a is made of a thermoplastic synthetic resin and, as shown in FIG.
a convex pole insulating portion 8 for covering and insulating the circumference of the convex poles 5a to 5h excluding the surface facing the rotor of a to 5h, and covering the inner peripheral surface of the slot formed integrally with the convex pole insulating portion 8 An annular insulating portion 9 for insulation, a flange portion 11 for forming a step portion 10 on the outer periphery of one end side of the annular insulating portion 9 and positioning it on the end surface of the stator 1, and the flange portion 1
1 and the annular wall 12 formed in the outer peripheral part. The salient pole insulating portion 8 is open at the side opposite to the side where the flange portion 11 is formed, that is, the lower end side in FIG. 3, and the salient poles 5a to 5h are connected to the salient pole insulating portion 8 from the end surface side of the stator 1. It is disposed inside the slots 6a to 6h by inserting the flange portion 11 until it abuts on the end surface of the stator 1. When the flange portion 11 is inserted into the end face of the stator 1 until the slot insulating member 7a is inserted, the end edge 9a at the front end in the insertion direction is located at an intermediate position in the axial direction of the stator 1. .

A terminal 13 is integrally fixed to the step portion 10 and is provided. The terminal 13 has a rod-shaped connecting portion 13a protruding along the axial direction of the stator and the connecting portion 13a. And a locking portion 13b formed by bending the tip end portion thereof in the circumferential direction around the shaft center of the stator 1. The locking portion 13b is the base portion 13
c and the guide portion 1 formed by inclining the tip of the base portion 13c in a direction away from the end face of the printed wiring board described later.
It consists of 3d.

A tongue piece 15 is formed on the inner peripheral side of the salient pole insulating portion 8, and the tongue piece 15 has a predetermined coil winding wound around the coil housing groove 8a of the salient pole insulating portion 8. The printed wiring board is regulated so that it does not protrude from the portion, and the printed wiring board described later is positioned. The top portion of the tongue piece 15 and the edge of the annular wall 12 are provided with the slot insulating member 7.
It constitutes an abutting portion provided on a.

The slot insulation 7b is formed in the same shape as 7a except that the terminal 13 is not provided, and the slot insulation member 7b is arranged in the slots 6a to 6h as described above. Slot insulation member 7
This is done by inserting from the other end side of the stator 1 in the same manner as a. When both slot insulating members 7a and 7b are inserted and arranged from both ends of the stator 1, the edge 9 of the annular insulating portion 9 of the slot insulating member 7a is arranged.
The edge a and the edge 9a of the slot insulating member 7b corresponding to the edge 9a are in contact with each other.

After the slot insulating members 7a and 7b are arranged in the slots 6a to 6h, the windings are wound around the respective salient poles 5a to 5h and the ends of the windings are connected to the terminal 1
Coil 1 by winding around 3 and connecting by soldering
6 a to 16 h are arranged on the stator 1. The printed wiring board 20 for connecting the coils 16a to 16h to the lead wires 17 is attached to the stator 1 having the coils 16a to 16h thus arranged.

The printed wiring board 20 is provided with a through hole 20a for inserting a rotor (not shown) in the center and a printed wiring 21 is formed at a predetermined position. A plurality of connection holes 23 are formed as engaging portions into which the terminals 13 provided in the slot insulating member 7a are inserted. The connection hole 23 is formed in a long hole shape and has a size such that the locking portion 13b of the terminal 13 can be freely inserted and removed. In addition, the terminal 1 among the end edges of the connection hole 23 in the long axis direction.
The hole edge portion 23a of the locking portion 13b on the side of the locking portion 13b engages with the base portion 13c when the base portion 13c of the locking portion 13b is positioned in pressure contact with the hole edge portion 23a. The hole edge portion 23a constitutes an engagement edge.

Next, how to attach the printed wiring board 20 to the slot insulating member 7a, that is, the stator 1 will be described. First, the slot insulations 7a and 7b are inserted and attached to the stator 1 from both ends thereof, and then the coil 16 is wound by winding the coil storage groove 8a of the salient pole insulation portion 8.
a to 16h are provided, and the winding terminal is wound around the connecting portion 13a of the terminal 13 and soldered for connection. Then, the slot insulating member 7a is inserted into the connection hole 23 of the printed wiring board 20.
In the drawing of the printed wiring board 20, the lower surface of the printed wiring board 20 is inserted into the terminal 13 provided at the end of the annular wall 12 and the tongue piece 15.
Of the printed wiring board 20 in the clockwise direction (arrow direction) in FIG. 3 while sliding the lower surface to the edge of the annular wall 12 and the top of the tongue piece 15 while contacting the top of the tongue 15. The terminal is rotated until the locking portion 13c of the terminal comes into pressure contact with the hole edge portion 23a of the connection hole 23, that is, until the connection portion 13a contacts the end edge of the connection hole 23.

In this state, as shown in FIGS. 3 and 4, the printed wiring board 20 has the slot insulating member 7a.
Of the tongue piece 15 and the edge of the annular wall 12 and the terminal 1
3 and the base portion 13c of the locking portion 13b, the base portion 13
c is engaged with the upper surface of the hole edge portion 23a of the connection hole 23 in a pressure contact state via the printed wiring 21, and the printed wiring board 2
The number 0 is retained by the terminal 13 and attached to the slot insulating member 7a, that is, the stator.

As described above, the coils 16a through 1
After the printed wiring board 20 is attached to the slot insulating member 7a of the stator 1 in which 6h is arranged, the surface of the printed wiring board 20 on which the printed wiring 21 is provided is melted in the solder bath in the same manner as the conventional method described above. This is to immerse and perform automatic soldering processing. In this automatic soldering process, since the printed wiring board 20 is locked by the locking portion 13b of the terminal 13, the printed wiring board 20 does not fall off during the soldering process,
Further, since the terminal 13 is not melted by heat, the locking member (the head 114a of the mounting protrusion 114) that locks the printed wiring board 20 is melted by the heat of the molten solder unlike the conventional case. It is possible to reliably prevent the printed wiring board 20 from coming off.

When the printed wiring board 20 is attached to the slot insulating member 7a, since the guide portion 13d is formed on the locking portion 13b of the terminal 13, the connection hole 2 is formed.
The engaging portion 13b can be easily engaged with the hole edge portion 23a of No. 3.

Next, a structure for surely maintaining the state where the printed wiring board 20 is attached to the slot insulating member 7a will be described with reference to FIG. As shown in FIG. 5, this structure has a tongue piece 15 formed on the slot insulating member 7a.
A locking projection 15a as a positioning portion is formed at the tip end of the printed wiring board 20 and an engagement hole 23b as a positioned portion that engages with the locking projection 15a is formed on the printed circuit board 20. With this configuration, the terminal 13 is inserted into the connection hole 23 of the printed wiring board 20, and then the lower surface of the printed wiring board 20 in the drawing is engaged with the edge of the annular wall 12 and the locking projection 15a of the tongue piece 15. The contact portion 13a is brought into contact with the hole edge portion 23a of the connection hole 23 until the engagement portion 13c of the terminal is in a pressure contact state, that is, the connection portion 13a
When it rotates until it comes into contact with the edge of 3, the locking projection 15
a engages with the engagement hole 23b through the printed wiring 21. Therefore, the printed wiring board 20 has the stator 1
The locking of the terminal 13 in the axial direction is prevented by the locking portion 13b of the terminal 13.
Further, the rotation stop in the circumferential direction is performed by the engagement projection 15a. Therefore, the printed wiring board 20 is held in a state in which movement in the axial direction and the circumferential direction is surely restricted,
The terminal 13 does not move in the connection hole 23 during the soldering process, and the soldering process is reliably performed. In addition,
The engagement projection 15a does not necessarily have to be provided on the tongue piece 15 and may be provided on the annular wall 12 separately from the tongue piece 15. The engaging hole 23b is formed in the printed wiring board 2
Although the through hole penetrates 0, it may be formed in a concave shape without penetrating.

In the above embodiment, the connection hole 23 is formed in a long hole shape, but it may be formed in a round hole shape. Further, for example, the outer peripheral side of the printed wiring board 20 is cut out. The shape may be any shape as long as the shape is such that the locking portion 13b of the terminal 13 can be inserted therethrough. Further, in the above-described embodiment, the bending direction of the locking portion 13b of the terminal 13 is the direction along the circumferential direction around the shaft center of the stator 1, but the present invention is not limited to this, and the point is that the terminal 13 is engaged. Stop 13b
Need only be a direction that engages with the hole edge portion 23a of the connection hole 23, and can be any direction such as bending in a direction orthogonal to the circumferential direction. However, when bent along the circumferential direction as in the embodiment, there is an advantage that the guide portion 13d can be easily formed especially when the terminal 13 is a rod-shaped member. When the engaging portion 13b is bent in the direction orthogonal to the circumferential direction, the connecting hole 23 is connected to the hole in the direction orthogonal to the circumferential direction into which the engaging portion 13b is inserted and the connecting portion 13a. It may be configured so as to have an L-shape by the movable hole.

Further, in the above embodiment, the abutting portion of the slot insulating member 7a is constituted by both the annular wall 12 and the tongue piece 12, but it may be constituted by either one of them. .

[0031]

The present invention configured as described above can be applied to a coil using windings of various wire diameters on one type of printed wiring board, and the printed wiring and coil of the printed wiring board can be automatically The connection can be made by the soldering process, and the printed wiring board can be prevented from falling off from the stator during the automatic soldering process work. Further, the printed wiring board can be attached to the stator simply by aligning the terminal and the engaging portion, and the alignment is easy, so that the effect that the attaching work can be facilitated can be achieved. Is.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view of a stator of a stepping motor according to an embodiment of the present invention.

FIG. 2 is a side view in which a part of the stator of the above embodiment is cross-sectioned.

FIG. 3 is an exploded perspective view showing the relationship between the slot insulating member and the printed wiring board of the above embodiment.

FIG. 4 is a partial cross-sectional view showing a mounting state of the printed wiring board and the slot whisker insulating member of the above embodiment (X in FIG. 1).
-X sectional view).

FIG. 5 is a partial cross-sectional view showing another embodiment of the mounting state of the printed wiring board and the slot insulating member of the above embodiment.

FIG. 6 is a side view of a conventional stepping motor.

FIG. 7 is a plan view of a stator of the conventional example.

FIG. 8 is a side view showing a cross section of a part of the stator of the conventional example.

FIG. 9 is an exploded perspective view showing a relationship between the printed wiring board and the slot whisker insulating member of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 7a Slot insulation member 13 Terminal 13a Connection part 13b Engagement part 15 Tongue piece (contact part) 16a-16b Coil 20 Printed wiring board 23 Connection hole 23a Hole edge part (engagement edge)

Claims (3)

[Claims] 1. A stator having a plurality of salient poles, a slot insulating member having a contact portion formed in a slot formed between the salient poles and protruding from an end face of the stator, and the slot. A terminal provided on an insulating member and having a connecting portion protruding from an end edge of the stator along the axial direction of the stator and a locking portion formed by bending a tip end of the connecting portion; and the slot insulating member interposed. And a coil whose winding end is connected to the connecting portion of the terminal and an engaging edge through which the engaging portion of the terminal is inserted and which engages with the engaging portion A printed wiring board having an engaging portion having an engaging edge and holding the engaging edge between the engaging portion and the abutting portion of the slot insulating member; and a bracket having bearings provided at both ends of the stator. Stepping motor for the bets, characterized in that a rotatably supported by the rotor bearing. 2. The locking portion of the terminal is bent in a circumferential direction around the shaft center of the stator, and the tip portion thereof is inclined so as to be gradually separated from the end surface of the printed wiring board. 1. The stepping motor according to 1. 3. A positioned portion is formed on the printed circuit board, and the positioned portion is held on the printed wiring board when the engaging edge is held by the locking portion and the contact portion of the slot insulating member. The stepping motor according to claim 1 or 2, further comprising a positioning portion that engages with the stepping motor.