JPH0521958Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is applicable to electric motors such as stepping motors having a stator and rotor, generators, resolvers, tachometer generators, etc., or induction type rotational position detectors ( This invention relates to a lead tap wire connecting portion for connecting a lead tap wire of a stator winding used in a rotary electric machine (hereinafter referred to as a rotating electric machine, etc.) to an output electrode.

[Prior Art] Conventionally known methods for connecting lead-tapped wires of stator windings include winding the lead-tapped wire around this end by using the end of the external lead wire, that is, the lead wire, as an output electrode, and then heat-shrinking the wound portion. It is known to cover the tube with adhesive and fix it in the space between the magnetic poles. However, this type of connection has problems in that it requires many manufacturing steps, is cumbersome, and takes time for the adhesive to harden, making it impossible to form the connection simply and in a short time.

Therefore, recently, a connection portion for lead tap wires using a printed circuit board 1 as shown in FIG. 11 has been proposed. As shown in detail in FIG. 12, the substrate 1 has a recess formed on its outer periphery to elastically engage a resilient engagement protrusion 6 protruding from the end of the end form 5 fitted to the stator core. and fixed. An end cap (not shown) is fixed to one end surface of the stator core fixed to the housing 4 by screws 2 .
The lead tap wires 7, 7' of the stator windings wound around the magnetic poles (not shown) are inserted into the end form 5 through lead-out holes (not shown) formed in the end form 5.
pulled out to the outside. and lead tap wire 7
are wound around and fixed to prismatic output electrodes 9, 9 protruding from the ends of the circuit pattern 3 formed on the surface of the substrate 1 through guide grooves 8, 8 formed on the outer periphery of the substrate 1. . Note that the tap wire 7 may be soldered after being wound around the output electrodes 9, 9. A lead wire connected to an external power source is soldered to an electrode 10 formed at the other end of the circuit pattern.

[Problems to be solved by the invention] Although the conventional tap wire connection section using the board 1 shortens the length of the lead tap wire,
In addition to the problem that the number of parts increases, there is also the problem that the price increases because an expensive printed circuit board 1 with a complicated shape is required. Further, when attempting to make a rotating electric machine or the like thinner, there is a problem in that the substrate 1 fixed to the end face of the end form becomes an obstacle to making the rotary electric machine thinner. Furthermore, if the substrate 1 is provided on the end face side of the stator core, the heat dissipation effect will deteriorate.
It is necessary to provide a certain amount of space between the substrate 1 and an end cap (not shown), and this has also become a big problem when making the device thinner. In addition, as a result of trying to shorten the length of the lead tap wire, the positions of the connection points between the lead tap wire 7 and the electrode 9 are dispersed, so when automating the connection of the tap wire 7, the automation machine is very difficult to connect. The problem was that it was complicated.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a stator core 1 as shown in the embodiment shown in the drawings.
Stator winding lead tap wire connection that connects the lead tap wires 37' at the beginning and end of the stator windings L12 and L22 wound around the plurality of magnetic poles P1 to P8 of No. 7 to the corresponding output electrodes 26. In this section, the above problems are solved. In this invention,
Output electrode fixing frame 23 that fixes a plurality of output electrodes 26 in a state where they are arranged in parallel at predetermined intervals.
is formed integrally with the end form 22 on the outer peripheral side of the end form 22 that is fitted to the plurality of magnetic poles P1 to P8. The output electrode fixing frame 23 includes an electrode fixing part 25 that fixes the plurality of output electrodes 26 in an exposed state, and a plurality of output electrodes 26
and a wall portion 28 in which a plurality of lead tap wire guide grooves 27 extending toward the output electrodes 26 corresponding to the positions thereof are formed. Lead tap wires 37 of stator windings L12 and L22,
37' is the corresponding lead tap wire guide groove 2.
7 and is connected to the corresponding output electrode 26 by soldering.

[Operation of the invention] Output electrode fixing frame 23 that fixes a plurality of output electrodes 26 in a state where they are arranged in parallel at a predetermined interval.
is formed integrally with the end form 22 on the outer circumferential side of the end form 22, so the thickness of the stator can be made thinner compared to the conventional technique in which a printed circuit board is fixed to the end face of the end form. Furthermore, the output electrode 26 can be arranged in a concentrated manner at one location on the output electrode fixing frame 23 while maintaining good heat dissipation. Furthermore, the output electrode fixing frame 23 can be fixed to the stator core 21 by simply attaching the end form 22 to the stator core 21, so the output electrode 26 can be easily fixed with a small number of parts. can.

Further, in the present invention, the output electrodes 26 are centrally arranged in one place on the electrode fixing part 25 of the output electrode fixing frame 23, and each lead tap wire guide groove 27 formed in the wall part 28 is connected to the corresponding output electrode 26.
6, the end form 2 is formed in the lead tap wire guide groove 27.
Stator winding lead tap wires 37, 3 from the 2 side
7', the lead tap wire can be easily positioned on the output electrode 26. As a result, it has become easy to automate the winding work and the soldering work of the lead tap wire to the output electrode.

[Example] The present invention will be described in detail below with reference to the drawings. FIG. 1 shows a schematic configuration diagram when the present invention is applied to a connection portion of a lead tap wire of a stator of an inductive rotational position detector of a hybrid stepping motor. This induction type rotational position detector is based on a practical application filed by the applicant on August 7, 1986.
This is a novel rotational position detector disclosed in No. 62-121340 (Utility Model Application No. 1-30672). In Figure 3,
A half sectional view of a hybrid stepping motor 12 equipped with this inductive rotational position detector 11 is shown. Like the known hybrid stepping motor, the stepping motor includes a motor stator 13 around which two excitation windings L11 and L21 are wound, and a permanent magnet 1 fixed to a rotating shaft 16.
4 and a motor rotor 15 sandwiching the motor. The induction type rotational position detector 11 includes a sensor rotor 17 that is magnetically coupled to the permanent magnet 14 of the motor rotor 15 and fixed to the rotating shaft 16, and a plurality of sensors provided on the outer periphery of the sensor rotor 17. A winding for speed voltage detection or a winding for back electromotive force detection L1 is attached to a plurality of magnetic poles each having a plurality of pole teeth facing the pole teeth.
2, and a sensor stator 18 formed by winding L22. The motor stator 13 is fixed to the first frame half 19 and the sensor stator 18 is fixed to the second frame half 19.
is fixed to the frame half 20 of. Furthermore, the third
In the figure, the connecting portion of the lead tap wire is not shown. The flow of magnetic flux from the permanent magnet 14 is as indicated by the arrows. When the sensor rotor 17 rotates, the magnetic poles of the sensor stator 18 and the sensor rotor 1
The area facing the magnetic pole of 7 changes, and the windings L12 and L22 wound around the sensor stator 18 receive a speed voltage that changes according to the positional relationship between the pole teeth of the motor rotor 14 and the motor stator 13. is output. As is clear from FIG. 3, this detector 11
and a second frame half 20 within a narrow housing. Recently, stepping motors have been widely used as drive motors for magnetic floppies, but as the demand for smaller floppy drives is increasing day by day, making the motors thinner has become an unavoidable problem. There is. Therefore,
In order to meet such demands, it has become essential to make not only the motor body but also the detector 11 thinner. This embodiment is an example in which the present invention is applied to such a case.

In FIG. 1, the same members as those shown in FIG. 3 are given the same reference numerals as in FIG. 3. The sensor rotor 17 includes a stator core 21 and a stator core 2.
End form 2 fitted from one side of 1
2, an output electrode fixing frame 23 formed integrally with the end form 22, an insulating end plate 24 (FIG. 2) attached to the other side of the stator core 21, and windings L12 and L22 (not shown). It consists of The stator core 21 is formed of a laminated steel plate or a single steel plate similar to known stator cores, and salient magnetic poles P1 to P8 are protruded from the inner peripheral side of the annular yoke portion 21a. . Although not shown, a plurality of pole teeth are formed on the magnetic pole surface of each magnetic pole at magnetically equal pitches to the pole teeth formed on the magnetic pole surface of the magnetic pole of the motor stator.

End form 22 and electrode fixing frame 2
3 is integrally molded from insulating resin.
The end form 22 has an annular yoke portion 21a at its base.
a cylindrical portion 22a that is fitted onto the inner periphery of the cylindrical portion 22a; and a winding frame portion that protrudes from the inner periphery of the cylindrical portion 22a and covers the magnetic poles except for the opposite surfaces of the magnetic poles P1 to P8 and the magnetic pole faces. 22b... and protrusion parts 22c... that protrude to the opposite side of the iron core 21. Winding frame part 22b
As shown in FIG. 4, an upright portion 22b1 is provided to protrude in the axial direction. The insulating end plate 24 covers a surface opposite to the annular yoke portion 21a and the magnetic pole, which is not covered by the winding frame portion 22b. If a winding frame is constructed using one end form 22 and a thin insulating end plate 24 in this way, two
This has the advantage that the winding frame can be made thinner than the case where two end forms face each other to form a winding frame.

The output electrode fixing frame 23 includes an electrode fixing part 25 that protrudes radially outward from the outer peripheral side of the end frame 22 and fixes the plurality of output electrodes 26 in an exposed state. Further, this frame 23 extends in the direction in which the output electrodes 26 are arranged in parallel so as to constitute a part of the cylindrical portion 22a of the end form 22, and has a plurality of lead tap wires at positions corresponding to the output electrodes 26. Guide groove 27
It is provided with a wall portion 28 in which... is formed.

These groove portions 27 extend toward the corresponding output electrodes 26, respectively. Further, as seen in FIG. 5, which is a sectional view taken along the line V-V in FIG. 1 excluding the second frame half 20, it has a Y-shaped cross-sectional shape when viewed from the radial direction. In this embodiment, the width of the base or bottom side of these grooves 27 is larger than the diameter of the lead tap wire at the beginning or end of the winding conductor of the stator winding (not shown). Further, since the opening of the groove 27 widens outward, there is an advantage that the lead tap wire can be easily inserted. Note that this groove 27
By setting the width of the bottom side of the wire to be slightly smaller than the diameter of the lead tap wire, by simply inserting the lead tap wire into the groove 27, the lead tap wire can be temporarily fixed in addition to positioning.

The output electrodes 26 are formed by printing an electrode pattern on one surface of the insulating resin substrate 29. The printing of the electrode pattern is performed by etching copper foil, applying conductive paint, or the like.
As shown in FIG. 6A, through holes 30 are formed in the substrate 29 so as to pass through each output electrode 26, and the core wires of the lead wires 31 are inserted into the through holes 30 from the bottom of the substrate 29. 31a is inserted, and the core wire 31a is soldered and fixed to the output electrode 26 of the board 29 in advance. In this embodiment, when soldering the core wire 31, solder is applied to the entire surface of the output electrode 26. This solder is used as a preform solder 41 to be used later when the lead tap wire is soldered to the output electrode 26 by reflow soldering.

The board 29 is fitted into a board fixing recess 25a formed in the electrode fixing part 25, and each lead wire 31 fixed to the board 29 is inserted into a positioning groove 25b formed at one end of the electrode fixing part 25. ing. These positioning grooves 25b are
1 is formed so that the lead wire 31 is positioned below the substrate 29 so that it does not get in the way. The board 29 is inserted into the recess 25a in such a manner that elastic engagement protrusions 32 provided at both ends of the recess 25a on the opening side are pushed outward and the board 29 is fixed by the protrusions 32. and positioning are being performed.

Further, partition wall portions 33 (see FIG. 5) are provided protrudingly from the entrance side of the positioning groove 25b of the lead wire 31, and between these partition wall portions 33 and between the outer wall portion 25d, there is a gap in the direction in which the positioning groove 25b extends. Vertical grooves 34 extending in a direction perpendicular to are formed. Furthermore, as shown in FIG. 7, on the back side of the electrode fixing part 25,
A pair of engagement recesses 35 are formed. Vertical groove 3
4 are inserted with the pressing protrusions 36a of the lead wire presser hook 36 shown in FIGS. Even if it is
The lead wire 31 is prevented from easily coming off.
Furthermore, an engaging protrusion 36c provided at the tip of the pair of legs 36b of the hook 36 is elastically engaged with the engaging recess 35, and the hook 36 is fixed to the electrode fixing part 25. . Pressing protrusion 36a of hook 36
A Y-shaped guide groove 36d is formed at the opposite end. This guide groove 36d is used when the winding conductor 37 (FIG. 6A) constituting the lid tap wire of the stator winding is soldered to the output electrode 26.

The method of winding the stator windings around the magnetic poles P1 to P8 and the method of soldering the winding conductors 37 constituting the lead tap wires will be described below with reference to FIGS. 6A and 6B and FIG. 9. First, to explain the beginning of the winding, as shown in FIG. 37 is press-fitted to fix the end of the winding conductor 37. The next winding conductor 37 is passed through the guide groove 36d of the hook 36 into the lead tap wire guide groove 2.
Insert into 7. Thereafter, conductors are wound around the magnetic poles by a known winding method in the order shown in FIG. 9, which shows an example of the winding order. The example in Figure 9 is
Since this is just an example, it goes without saying that winding may be done in another order.

In the case of the example in Figure 9, magnetic poles P1, P3, P5, P
7 and the conductor is the second speed voltage detection winding L
22, and the conductor wound around the magnetic poles P2, P4, P6, and P8 is the first speed voltage detection winding L12.
Configure. For example, the first speed voltage detection winding L
12, the conductor passing through the groove 27 at the right end in FIG.
(FIG. 2), it is routed to the magnetic pole P2 while contacting the outer circumferential surface, and after being wound around the magnetic pole P2, it is routed through the back side to the magnetic pole P4, and is wound around the magnetic pole P4. Thereafter, it is wound around the remaining magnetic poles in the same manner.
Then, the conductor wound around the magnetic pole P8 is inserted into the second groove 27 from the left as seen in FIG. 9, and is then placed in another frame through the reverse process from the beginning of winding. Second
The speed voltage detection winding L22 is also wound in the same manner.

After the lead tap wires at the beginning and end of each of the first and second speed voltage detection windings are arranged as shown by the dashed lines in FIG. 6A, the presser plate 40 is
is lowered onto the substrate 29 side and the conductor 37' is pressed onto the electrode 26. Since the groove portion 27 and the guide groove 36d are provided so as to face each other on both sides of the electrode 26, the conductor 37' is reliably positioned on the electrode 26 even if the presser plate 40 is pressed down appropriately. Note that as shown in FIG. 6B, the core wire 3 of the lead wire 31
Since the solder deposited on the output electrode 26 when soldering 1a has a chevron-shaped cross section, the end of the holding plate 40 has an inwardly curved shape.

The conductor 37' constituting each lead tap wire is soldered to each electrode 26 using, for example, a reflow soldering method. As shown in FIG. 6A, when soldering the core wire 31a of the lead wire 31, preform solder 41 is placed on each electrode in advance,
A heater electrode 42 equipped with a heater inside is brought into contact with the conductor 37' and the solder 41 to melt the solder 41 and perform soldering. Note that the end of the heater electrode 42 also has a curved end shape similar to the end shape of the presser plate 40 shown in FIG. 6B so as to match the cross-sectional shape of the preform solder 41 having a chevron shape.
After soldering is completed, the holding plate 40 is pulled up and unnecessary portions of the conductor 37' are cut off with a cutter.
Each lead tap wire can be soldered separately, or all lead tap wires can be soldered at the same time. Moreover, it is of course possible to carry out soldering work in the middle of the winding process for each process, that is, each time the beginning work and the end work are completed.

Although the winding work can be performed entirely automatically using an automatic winding machine and an automatic soldering machine, it is of course possible to perform the winding and soldering manually.

In the above embodiment, the lead wire 31 is connected to the output electrode using solder.
As shown in FIG. 10, the output electrode 26' has a terminal structure, and the lead wire and output electrode 2
6' may be electrically connected.

Further, in the above embodiment, the hook 36 has the guide groove 3.
6d, the conductor 37' can be reliably positioned and fixed on the output electrode 26, but in the case of this embodiment, the conductor 37' is also held by the piece 38. It is not always necessary to use the guide groove 36d.

Guide groove 27 and guide groove 36 of the above embodiment
The shape of d may be any shape as long as the width of the opening is wide and the width of the bottom is narrow. For example, the cross-sectional shape may be V-shaped.

Furthermore, the above embodiment is an example in which the present invention is applied to the connection part of the lead-tapped wire of the stator of an inductive rotational position detector, but the present invention is also applicable to the connection of the lead-tapped wire of the stator of a rotating electric machine such as an electric motor or a resolver. Of course, it can also be applied to the section. In particular, when the present invention is applied to the motor stator of a thin motor that is strongly required to be thin, such as a stepping motor used as a drive source for a magnetic floppy disk, extremely large effects can be obtained.

[Effects of the invention] According to the invention, an output electrode fixing frame for fixing a plurality of output electrodes arranged in parallel at a predetermined interval is formed integrally with the end form on the outer circumferential side of the end form. Compared to the conventional technology in which the printed circuit board is fixed to the end face of the end form, the thickness of the stator can be made thinner, the heat dissipation can be improved, and the output electrode can be fixed to the output electrode. Can be placed centrally in the frame. Further, the output electrode fixing frame can be fixed to the stator core simply by attaching the end form to the stator core, so the output electrode can be easily fixed with a small number of parts. Furthermore, in the present invention, the output electrodes are arranged in a concentrated manner in the electrode fixing part of the output electrode fixing frame, and each lead tap wire guiding groove formed in the wall part extends toward the corresponding output electrode. Therefore, by simply inserting the lead tap wires of the stator winding from the end form side into the multiple lead tap wire guide grooves, the lead tap wires can be easily positioned on the output electrodes, and winding work and lead tap wires can be easily positioned. This has the advantage that the soldering work to the output electrode can be easily automated.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view excluding the stator winding of an embodiment in which the present invention is applied to the stator of an inductive rotational position detector, and Figure 2 is a side view of the end form fixed to the stator core. 3 is a half-sectional view of the hybrid stepping motor equipped with the inductive rotational position detector shown in FIG. 1, FIG. 4 is a diagram showing the fitting relationship between the end form and the magnetic pole, and FIG. is a sectional view taken along the line V-V in FIG. 1, and FIG. 6A is a diagram showing the state when positioning and soldering lead tap wires.
Fig. 6B is a view showing the state in which the lead tap wire is held down by the holding plate, Fig. 7 is a rear view of the electrode fixing part, Fig. 8A is a plan view of the lead wire holding hook, and Fig. 8B is the lead wire holding hook. FIG. 9 is a diagram showing the winding order of the stator winding, FIG. 10 is a diagram showing different examples for connecting lead wires, and FIG. 11 is a conventional lead tap wire connection structure. and FIG. 12 are partially enlarged perspective views showing details of the conventional connection portion shown in FIG. 11. 11... Inductive rotational position detector, 12... Stepping motor, 13... Motor stator, 14...
... Permanent magnet, 15 ... Motor rotor, 16 ... Rotating shaft, 17 ... Sensor rotor 17, 18 ... Sensor stator, 21 ... Stator core, 22 ... End form, 23 ... Output electrode Fixing frame, 2
4... Insulating end plate, 25... Electrode fixing part, 26...
Output electrode, 27... lead tap wire guide groove,
28...Wall portion, 29...Substrate, 30...Through hole,
31... Lead wire, 33... Partition wall portion, 34... Vertical groove, 35... Engaging recess, 36... Lead wire holding hook, 37, 37'... Winding conductor, 40... Holding plate, 41 ...Preform solder, 42...Heater electrode.

Claims (1)

[Claims for Utility Model Registration] (1) A stator winding that connects lead tap wires at the beginning and end of a plurality of stator windings wound around a plurality of magnetic poles of a stator core to corresponding output electrodes. In the lead tap wire connection section, an output electrode fixing frame for fixing the plurality of output electrodes in a state in which they are arranged in parallel at a predetermined interval is attached to the outer peripheral side of the end form to be fitted to the plurality of magnetic poles. The output electrode fixing frame includes an electrode fixing part that fixes the plurality of output electrodes in an exposed state, and an output electrode provided on the end form side and corresponding to the position corresponding to the plurality of output electrodes. and a wall portion in which a plurality of lead tap wire guiding grooves extending toward the electrodes are formed, and the lead tap wires of the stator winding are inserted into the corresponding lead tap wire guiding grooves. A lead tap wire connection portion of a stator winding, characterized in that the lead tap wire connection portion is connected to the output electrode by soldering. (2) The lead tap wire connecting portion of the stator winding according to claim 1, wherein the lead tap wire guiding groove has a shape that is wide on the opening side and narrow on the bottom side. (3) The utility model according to claim 1, wherein the plurality of output electrodes are printed on a circuit board, and the circuit board is fixed to the electrode fixing part of the output electrode fixing frame. Stator winding lead tap wire connection.