JPH083192Y2 - Stepping motor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a PM (permanent magnet) type stepping motor in which insulation treatment of a connecting portion between a stator winding and an external lead wire connected thereto is improved. Regarding

[Conventional technology]

As shown in FIG. 8, the PM type stepping motor has a winding frame 2 around which a winding 1 is wound, and
Interdigitated salient poles that stagger along the inner surface of the body
Two sets of stators 5 formed by fitting a pair of yokes 3 and 4 having 3a and 4a are stacked and housed in a motor frame 6, and the motor frames 6 are arranged inside the two sets of stators 5. The rotor 7 is rotatably supported. The motor frame 6 is, for example, a bottomed cylindrical metal cup frame 8
And a substantially flat plate-shaped base frame 9 provided so as to close the opening of the frame 8. The base frame 9 has a pair of mounting portions (not shown), and the mounting portions are fixed to the motor fixing portion via a fixing tool. The outer peripheral portion of the rotor 7 is composed of permanent magnets 7a that are magnetized to the same pole along the axial direction and that have different poles alternately arranged along the circumferential direction. In addition, in FIG.
Reference numeral 10 denotes a bearing that rotatably supports the rotating shaft 7b of the rotor 7.

The insulation treatment between the connecting portion between the winding wire 1 and the external lead wire 14 in such a PM type stepping motor has conventionally been as shown in FIGS. 9 and 10. That is, the notches 11 formed on the cup frame 8 of the motor frame 6 are overlapped with each other on the peripheral portions of the two winding frames 2.
Is formed with a plurality of conductive pins 13 on the front surface thereof. The end of the winding 1 is entwined and soldered to the pin 13, and the end of the external lead wire 14 is further entangled and soldered thereon. An insulating member 15 made of a heat-shrinkable tube or an insulating adhesive tape is adhered to the connecting portion centering on the pin 13, and this portion 15 insulates the adjacent connecting portions.

[Problems to be solved by the device]

In such a conventional configuration, when the insulating member that insulates the connecting portion centered on the pin 13 is a heat-shrinkable tube, this is placed in advance through the external lead wire 14, and after soldering, Since it is necessary to move the tube so as to cover the solder portion, and also the heating work is required, there is a problem that the insulation work is troublesome, and the tube is likely to be damaged or defective in adhesion. There was a problem that the insulation was not reliable. Even when the insulating member is an adhesive tape, the work space for winding the tape is very small, so that the insulating work is troublesome and the adhesive tape may be unwound, resulting in good insulation reliability. There was a problem of not having. Further, in the conventional configuration, the external lead wire 14 is not supported anywhere other than the connection portion with the pin 13, so when the external lead wire 14 is pulled, the force is directly applied to the pin 13 and the external portion. There is also a problem that the external lead wire 14 is likely to be pulled out, as a result of being added to the connecting portion with the lead wire 14.

The object of the present invention is that the work of insulating the connection between the winding and the external lead wire is easy, and the reliability of the insulation is high,
Another object of the present invention is to obtain a stepping motor in which the external lead wire is less likely to be pulled out and the insulating member which forms the insulation is easily held at a predetermined position.

[Means for solving the problem]

The present invention provides two sets of stators in which a pair of yokes having comb tooth-shaped salient poles that are alternately inserted along the inner surface of the body of the winding frame are fitted to a winding frame around which windings are wound. ,
The motor frames are stacked and housed in the motor frame, and the rotors disposed inside the two sets of stators are rotatably supported by the motor frames, and the notches of the motor frames are overlapped with each other on the peripheral portions of the winding frames. The present invention is applied to a stepping motor in which a convex portion that fits into a portion is formed and a plurality of conductive pins that are planted on the front surface of the convex portion are connected to the ends of the winding and the external lead wires, respectively. In order to achieve the above-mentioned object, in the stepping motor of the present invention, a pawl receiver is provided on each of both sides of the rear portion of the convex portion, and is made of a resin molded product having a pair of locking pawls engaging with the pawl receiver. Of the insulating member of the present invention, the locking claw is locked to the claw receiver to hold the insulating member over the front surface and both side surfaces of the convex portion, and the pin, the winding terminal, and the external lead wire are connected to the pair of insulating members. A plurality of divided storage grooves for independently storing the connection portions and a groove forming wall for partitioning the storage grooves are provided, and the pair of insulating members attached to the both convex portions are provided in The groove forming wall of one insulating member closes the opening of the section storing groove of the other insulating member and overlaps with each other, and each groove forming wall is inserted into the section storing groove closed by the groove forming wall. Stored in this compartment The external lead wire is provided with a projection for clamping between the bottom surface of the segment receiving groove closes the above groove forming wall.

[Action]

In the present invention, the insulating member is embraced over the front surface and both side surfaces of the convex portion by engaging the claw receiver of the convex portion of the winding frame of the pair of locking claws of the insulating member from the front side of the convex portion, and the claws are held. The engagement prevents the insulating member from being pulled outward in the radial direction of the winding frame. Each of the divided storage grooves provided in the insulating member individually stores the pin implanted in the front surface of the convex portion, the winding terminal, and the connecting portion of the external lead wire, and the adjacent ones are connected to each other. Insulate the connecting parts.

Further, the projection formed on the groove forming wall for partitioning the compartment housing groove is inserted into the compartment housing groove facing the compartment housing and the external lead housed in the compartment housing groove with the bottom surface of the compartment housing groove. Hold the line. In this case, since the external lead wire is passed through the divided storage groove, the projection is inserted into the divided storage groove, so that the external lead wire and the projection need not be aligned with each other. The lead wire can be sandwiched between the protrusion and the bottom surface of the compartment containing groove. When a tensile force acts on the external lead wire due to such clamping of the external lead wire, the tensile force is directly applied to the connecting portion between the external lead wire and the pin when the tensile force acts on the external lead wire. Prevent that. Further, as described above, since the projections of the groove forming wall are inserted into the opposed compartment housing grooves to couple the pair of insulating members, one of the pair of insulating members which is overlapped is provided along the circumferential direction of the winding frame. When the turning force acts from the side, the external force can also be supported by the other insulating member. This can prevent the insulating member from moving out of the convex portion.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 6. In the description, the same components as those of the conventional technique described with reference to FIG. 8 are denoted by the same reference numerals, and the description thereof will be omitted. Different components will be described below.

As shown in FIG. 1, claw receivers 22 are provided on both sides of a rear portion of a convex portion 21 integrally formed on the peripheral portion of the winding frame 2 and having a plurality of pins 13 planted on the front surface thereof. These claw receivers 22 are formed by steps. Since the two sets of stators 5 are overlapped, the protrusions 21 of both stators 5 are also overlapped, and due to this overlap, a plurality of pins 13 respectively planted in each protrusion 21 are staggered in position. Of course, it is provided. Moreover, it goes without saying that the end of the winding 1 and the end of the external lead wire 14 are entangled and soldered to these pins 13, respectively.

Reference numeral 23 in FIGS. 1 to 6 denotes an insulating member made of a resin molded product. The insulating member 23 has a plurality of partitions partitioned by a groove forming wall 23a for individually accommodating the connecting portions of the pin 13, the end of the winding 1, and the end of the external lead wire 14 one by one. In addition to having compartments for storing grooves 24, these grooves
A pair of locking claws 25 integrally extending to the rear of 24 is provided. The locking claw 25 is elastically deformable and is adapted to be engaged with the claw receiver 22. As a result of this engagement, the insulating member 23 becomes a convex portion as shown in FIGS. 2 and 3.
The projection 21 is provided so as to embrace the front surface and both side surfaces of the projection 21.

The insulating members 23 attached to the pair of overlapping winding frames 2 as described above are overlapped with each other and are just fitted into the notches 11 as shown in FIGS. 4 to 6. A groove forming wall that divides each of the divided storage grooves 24 in one insulating member 23 by the above-mentioned superposition of the insulating members 23.
23a closes the opening of the other insulating member 23 on the overlapping surface side of each section storage groove 24.

The groove forming wall 23a that closes the openings of the respective compartments 24 is integrally provided with a pressing projection 26 that is inserted into the compartment 24. The protrusion 26 is provided to hold the external lead wire 14 between the tip of the protrusion 26 and the bottom surface of the compartment 24. By this clamping action, the pulling force acting on the external lead wire 14 is less transmitted to the connecting portion with the pin 13, and the pull-out strength of the external lead wire 14 is improved.

On both sides of the insulating member 23, arc-shaped cover walls 27 are integrally projected. These walls 27 are, for example, formed relatively thin and elastically deformable.
As shown in FIG. 3, it is arranged between the collars of the winding frame 2 so as to cover the winding 1. Moreover, the radius of the arc-shaped cover wall 27 in the free state is slightly smaller than the radius of the winding wire 1 wound around the winding frame 2. As a result, the cover wall 27 is in contact with the outer peripheral surface of the winding 1 in a bent state, and the bending force urges the entire insulating member 23 forward so that the locking claw 25 and the claw receiver 22 are The engagement of is strengthened. Further, as shown in FIG. 1, the width A of the cover wall 27 is substantially equal to the axial length B of the body portion of the winding frame 2.

The PM type stepping motor having the above structure is assembled as follows. First, the winding 1 and the external lead wire 14 are entwined with the pins 13 and soldered, respectively, and then the division storage grooves 24 of the insulating member 23 are individually fitted to the respective external lead wires 14 and the state thereof is maintained. While maintaining the above condition, the insulating member 23 is inserted from the front of the convex portion 21 to be held by the convex portion 21 and at the same time, the locking claw 25 is locked to the claw receiver 22. The assembled state is shown in FIGS. 3 and 4. Then, a pair of yokes 3 and 4 are fitted to this assembly to form the stator 5. Next, the pair of stators 5 with the insulating members 23 thus prepared are stacked on each other so that the insulating members 23 are aligned with each other. Then, the presser projections 26 are inserted into the respective compartments 24,
The external lead wire 14 is sandwiched between the bottom surface of the storage groove 24 and the bottom surface. This state is shown in FIGS. 5 and 6. In this clamping operation, since the external lead wire 14 is passed through the division storage groove 24, the projection 26 is inserted into the division storage groove 24, so that the external lead wire 14 and the projection 26 are aligned with each other. The external lead wire 14 can be sandwiched between the projection 26 and the bottom surface of the compartment housing groove 24 accommodating the external lead wire 14 without the need for. Then, by sandwiching the external lead wire 16 in this way, when a tensile force acts on the external lead wire 14, the force can be supported at the sandwiching portion, whereby the external lead wire 14 and the pin 13 are Since the pulling force is prevented from directly acting on the connection portion of, the external lead wire 14 can be prevented from being pulled out. Also, as described above, the groove forming wall
By inserting the protrusions 26 of 23a into the divided compartment grooves 24 that face each other, the pair of insulating members 23 that are overlapped with each other can be combined. As a result, the pair of insulating members 23 stacked
When a force for rotating the winding frame 2 along the circumferential direction of the winding frame 2 acts on one side, the external force can also be supported by the other insulating member 23. Therefore, disconnection between the insulating member 23 and the convex portion 21 is prevented, so that the insulating member 23 does not move from the predetermined position, and the insulating member 23 is securely held at the predetermined position to have a predetermined insulating performance. Can be maintained. After that, the pair of stators 5 that are overlapped with each other while the insulating member 23 is fitted into the notch 11 are fitted into the cup frame 8. Finally, put the rotor 7 in the pair of stators 5,
After supporting the rotating shaft 7b by the bearing 10 of the cup frame 8, the opening of the cup frame 8 is closed and the base frame 9 is attached, and the pair of stators 5 are sandwiched between this and the bottom surface of the cup frame 8. In addition, the rotating shaft 7b is supported by the bearing 10 of the base frame 9.

With the above assembly, the connecting portion of the pin 13, the winding 1 and the external lead wire 14 is surrounded by the insulating member 23 on the upper, lower, left and right sides. Further, since the insulating member 23 is a resin molded product, it is extremely less damaged or peeled off as compared with a tube or tape. In addition, since the insulating member 23 can be supported against the forward pulling action by the engagement between the locking claw 25 and the claw receiver 22, it is possible to prevent the insulating member 23 from being accidentally detached. Therefore, it is possible to ensure the insulation between the adjacent connection portions.

Then, the insulating member 23 is attached by inserting the insulating member 23 from the front of the convex portion 21 while the external lead wire 14 is fitted in the divided storage groove 24 as described above, and the locking claw 25 is clawed. Since it is carried out by engaging with the receiver 22, it is easy to work.

Further, since the insulating member 23 is provided with the cover wall 27, the cover wall 27 covers the winding 1 and is arranged between the winding 1 and the vicinity of the notch 11 in the motor frame 6 (fifth portion).
See figure). Therefore, even if the end portion of the winding 1 reaching the pin 13 is loosened, there is no possibility that it will contact the cup frame 8 of the motor frame 6, and the winding 1
Of the motor frame 6 can be improved.

Moreover, since the width A of the cover wall 27 and the length B of the body portion of the winding frame 2 are substantially equal to each other, the cover wall 27 abuts on the inner surface of the flange portion of the winding frame 2 and the insulating member 23 is attached to the winding frame 2. Prevents axial movement. Therefore, it is possible to prevent the insulating member 23 from falling off the winding frame 2 at the time of assembly, etc., in combination with the aforementioned claw engagement.

Although the external lead wire 14 and the pin 13 are connected by soldering in the above-described embodiment, the invention is not limited to this. As shown in FIG. 7, the external lead wire 14 and the pin 13 are connected via the caulking type terminal fitting 28. And may be connected.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

A claw receiver is provided on the convex portion of the winding frame, and an insulating member made of a resin molded product having a pair of locking claws to be engaged with the insulating member is attached while being held by the front surface and both side surfaces of the convex portion. The insulating member is provided with a plurality of division storage grooves for individually accommodating the connecting portions of the pins implanted in the convex portion, the winding ends and the external lead wires one by one. The work of insulating the connecting portion with the lead wire can be facilitated, and the insulation reliability can be improved by preventing the insulating member from coming off due to the engagement between the divided storage groove and the claw.

In addition, the pair of insulating members respectively mounted on the convex portions of the two winding frames, which are superposed on each other, are covered with the groove forming wall of one of the insulating members so as to close the opening of the sectional accommodating groove of the other insulating member. In addition to overlapping, each groove forming wall has the external lead wire which is inserted into the section accommodating groove closed by the groove forming wall and accommodated in the section accommodating groove by the groove forming wall. The structure that provides the projection that is sandwiched between the bottom surface and the bottom surface supports the pulling force that acts on the external lead wire, reduces the risk that this lead wire will be pulled out, and the assembly required to support this pulling force. It is possible to easily hold the insulating member at a predetermined position while ensuring the attachment of the insulating member to the convex portion.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is an exploded perspective view of a main part, FIG. 2 is a perspective view of the main part, and FIG. 3 is an external lead wire connected. A plan view of the reel, FIG. 4 is a vertical side view of the whole, FIG. 5 is a partial perspective view, and FIG.
FIG. 6 is a sectional view taken along line VI-VI in the figure. FIG. 7 is a sectional view corresponding to FIG. 6 and showing another embodiment of the present invention. 8 to 10 show a conventional example, FIG. 8 is a vertical sectional side view of the whole, FIG. 9 is an enlarged sectional view of a part thereof, and FIG. 10 is a part of a winding frame to which lead wires are connected. It is a perspective view. 1 ... Winding wire, 2 ... Winding frame, 3,4 ... Yoke, 5 ... Stator, 6 ... Motor frame, 7 ... Rotor, 11 ... Notch, 13 ... Pin, 14 ... External Lead wire, 21 ...
22: nail receiver, 23: insulating member, 23a: groove forming wall, 24
…… Different storage groove, 25 …… Locking claw, 26 …… Projection, 27 …… Cover wall.

Claims (1)

[Scope of utility model registration request] 1. A pair of stators comprising a winding frame wound with windings fitted with a pair of yokes having comb-teeth-shaped salient poles which are alternately inserted along the inner surface of the body of the winding frame. To
The motor frames are stacked and housed in the motor frame, and the rotors disposed inside the two sets of stators are rotatably supported by the motor frames, and the notches of the motor frames are overlapped with each other on the peripheral portions of the winding frames. In a stepping motor in which a protruding portion that fits into a portion is formed, and the ends of the winding and the external lead wires are connected to a plurality of conductive pins that are planted on the front surface of the protruding portion, both sides of the rear portion of the protruding portion are described. Each of which is provided with a claw receiver, and an insulating member made of a resin molded product having a pair of locking claws which engages with the claw receivers, and the locking claws being locked to the claw receivers. A plurality of divided storage grooves for holding the connecting portions of the pins, winding terminals, and external lead wires individually in the pair of insulating members while holding them on both sides, and between these storage grooves. The partition A groove forming wall is provided, and the pair of insulating members attached to the both convex portions are provided with the groove forming wall of one of the insulating members to close the opening of the compartment containing groove of the other insulating member. In addition to overlapping, each groove forming wall has the external lead wire which is inserted into the section accommodating groove closed by the groove forming wall and accommodated in the section accommodating groove by the groove forming wall. A stepping motor, which is provided with a protrusion that is sandwiched between the stepping motor and the bottom surface of the stepping motor.