JPS622897Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric motor, and more particularly to an improvement in a fixing means for fixing a connecting portion between a winding coil and an external lead wire on the stator side.

In a conventional electric motor, a winding coil and an external lead wire are soldered, an insulating tape is wrapped around the soldered connection part, and then this connection part and a part of the external lead wire are wound with thread or the like. The method used was to tie it to the coil end.

However, such a method involves operations such as soldering, wrapping the insulating plate with tape, and tying with thread, so it has the drawback of requiring a large number of man-hours and increasing costs. In particular, when using a winding method in which the winding coil is mechanically wound and wound directly around the stator poles, there is a method in which the above-mentioned connection part and a part of the external lead wire are tied to the end of the winding coil with thread or the like. Even if you try to remove it, there is no gap for the thread to pass through, so you cannot carry out this method as is, and you have no choice but to pull the external lead wire out to the opposite side of the stator using the gap between the poles etc. However, there was a drawback that required more work.

An object of the present invention is to provide an electric motor in which the connection between the winding coil and the external lead wire and a part of the external lead wire can be easily and reliably fixed.

Hereinafter, an embodiment in which the present invention is applied to a two-phase stepping motor having eight stator poles will be described in detail. As shown in FIGS. 1 to 10, this stepping motor includes a rotor 1 and a stator 2 surrounding the outer periphery of the rotor 1. As shown in FIGS. The rotor 1 includes a rotating shaft 4 that is rotatably supported by a bearing 3, a permanent magnet 5 that is fitted around the outer circumference of the rotating shaft 4 and magnetized in the direction of the shaft 4, and a permanent magnet 5 that is attached to both poles of the permanent magnet 5. It is composed of a pair of magnetic pole caps 6 that are fitted and supported by the rotating shaft 4, and the like. The outer periphery of each magnetic pole cap 6 is provided with teeth in the direction of the axis 4.

The stator 2 has a cylindrical metal case 7,
An annular stator core 8 is fitted therein.
The stator core 8 is a laminated core in which a plurality of stator poles 8A are integrally provided radially on the inner surface of an annular yoke, and interpole gaps 8B are formed between the poles 8A. The inner end of each stator pole 8A faces the outer periphery of each magnetic pole cap 6 of the rotor 1 with a small distance therebetween, and teeth are also carved in the direction of the axis 4 on this inner end. An annular winding frame 9 made of plastic and shown in FIGS. 4 to 6 is abutted on both end surfaces of the stator core 8 as shown in FIG. 10. This winding frame 9 is attached to the inner surface of an annular frame 9A having an inner diameter corresponding to the inner diameter of the yoke of the stator core 8 and a predetermined axial length, from one end side in the length direction to each stator pole 8A. It has a structure in which frame portions 9B are integrally provided in a radial manner. Further, on the other end side in the length direction of the annular frame 9A, a plurality of female locking portions 13 are recessed at predetermined positions in the circumferential direction. Each frame portion 9B has an L-shape including a drum portion 9B1 corresponding to the end surface of the stator pole 8A and a collar portion 9B2 rising from the end portion in a right angle direction, and is integral with the annular frame 9A. The radial cross-section of the groove 9c is U-shaped, and a winding coil, which will be described later, can be accommodated in the groove 9c. Further, the cross section of the winding trunk portion 9B1 is arcuate as shown in FIG. A stator winding coil 10 is wound around each stator pole 8A by storing the winding in the groove 9C with the winding trunk 9B1 of the frame 9B in contact with both end faces of the portion protruding from the yoke. ing. In this case, the frame portions 9B of the winding frame 9 are in contact with both end faces of the stator poles 8A of the stator core 8 to prevent the coils from coming off, so the winding coil 10 can be efficiently wound by mechanical winding. Can be wrapped. Each coil 10 has its own lead wire 10
a are pulled out from the same side of the stator core 8. On the side from which the lead wire 10a is drawn out, a retaining insulating plate 11 made of plastic and having an annular shape as shown in FIGS. 7 to 9 is fitted between the annular frame 9A and the flange 9B2 of the winding frame 9. , are in contact with the side surface of each winding coil 10. This retaining insulating plate 11 has a plurality of male locking portions 12 protruding outward on its outer periphery.
3 and is locked to the winding frame 9. A plurality of cut grooves 14 are formed on the outer periphery of the retaining insulating plate 11, avoiding the male locking portion 12, and each lead wire 10a is drawn out from these cut grooves 14, respectively. In addition, the retention insulating plate 11 includes an interpole gap 8 of the stator core 8.
Corresponding to B, two retaining holes 15a and 15b are formed at different positions in the radial direction. Reinforcing protrusions 16 are integrally provided on the back surface of the retaining insulating plate 11 at the positions where these retaining holes 15a and 15b are provided, and these reinforcing protrusions 16 have interpole gaps 8B.
is mated to. Furthermore, lead wire retraction grooves 17 are formed on the inner peripheral edge of the upper surface of the retaining insulating plate 11 so as to communicate with each of the inner retaining holes 15a.
An external lead wire 18 is secured to each of the retaining holes 15a and 15b, respectively. That is, the external lead wire 18 has its tip inserted into one of the retention holes 15 a and passes through the retention insulating plate 11 , is folded back in a U-shape on the back side, and its tip is inserted into the other retention hole 15 b and passes through the retention insulating plate 11 . It is protruded from the front side. As shown in FIG.
The protrusion length is selected so that the protrusion protrudes outward from the end face of the protrusion. The lead wire 10a to be connected is wound around the lead wire tip 18a and connected by soldering. If the winding connection parts 19 of the lead wire tip 18a and the lead wire 10a are made to protrude outward from the end surface of the case 7, only these connection parts 19 can be inserted into the molten solder liquid and automatically All the connections 19 can be soldered at once. Note that during such soldering, each external lead wire 18 is inserted into the hole 20 of the stator 2 and led out to the opposite side, and each external lead wire 18 is inserted into the hole 20 through the lead wire retreat groove 17. west,
The external lead wires 18 other than the connecting portion 19 are retreated into the case 7. In this way, soldering can be performed without the external lead wire 18 getting in the way. After soldering, each external lead wire 18 is bundled together and passed through the rubber bushing 21 to the case 7.
It is led out from the end face of. Metal end plates 22 and 23 are fitted to both ends of the case 7. An insulating material 24 is interposed on the inner surface of the end plate 22 from which the external lead wire 18 is drawn out to insulate the connecting portion 19 and the like from the end plate 22. A bearing 3 is supported on the inner periphery of each end plate 22, 23.

As explained above, in the electric motor according to the present invention, a retaining insulating plate is provided on the side where the lead wire of the stator winding coil is present, and this retaining insulating plate covers the connecting portion between the winding coil and the external lead wire and the external lead wire. Since a part of the lead wire is fixed with a restraint, it can be fixed easily with less effort than in the past. Furthermore, even if the coil is mechanically wound, the connecting portion between the wound coil and the external lead wire and a part of the external lead wire can be easily fixed without any problem. Furthermore, in the present invention, since the winding frames are in contact with both end faces of the stator core, mechanical winding of the coil can be easily performed as required. Further, it is preferable that the length of the above-mentioned connecting portion is selected so as to project outward from the end face of the stator, since all the soldering work can be done at once.

[Brief explanation of the drawing]

The drawings show an embodiment of the electric motor according to the present invention. Fig. 1 is a vertical cross-sectional side view of the upper half of the electric motor of this embodiment, and Fig. 2 is a partially enlarged sectional view of the vicinity of the connecting and fixing part of the motor. , Fig. 3 is a front view of the lead wire pull-out side of the stator of the motor, Fig. 4 is a front view of the winding frame used in the motor, and Fig. 5 is a sectional view taken along the line X-X of Fig. 4. , FIG. 6 is a sectional view taken along the line Y-Y in FIG. 4, FIG. 7 is a front view of the retaining insulating plate used in the motor, FIG. FIG. 7 is a sectional view taken along the Z-Z line in FIG. 7, and FIG. 10 is a perspective view of a main part showing a state in which a winding frame is attached to a stator core. 1...Rotor, 2...Stator, 7...Metal case, 8...Stator core, 8A...Stator pole, 8
B... Gap between poles, 9... Winding frame, 9A... Annular frame, 9B... Frame section, 9B1... Winding drum section, 9B2
...Flame part, 9c...Groove part, 10...Winding coil,
10a...Leading wire, 11...Retaining insulating plate, 1
2, 13... Locking portion, 14... Cut groove, 15a,
15b... Retaining hole, 17... Lead wire retreat groove, 1
8... External lead wire, 19... Connection part.

Claims (1)

[Scope of claims for utility model registration] (1) In an electric motor equipped with a rotor and a stator,
The stator includes a stator core in which a plurality of stator poles protrude radially from the inner surface of an annular yoke at predetermined intervals, and an inner diameter corresponding to the inner diameter of the yoke of the stator core and a predetermined axial length. Each of the stator poles is provided protruding from the other end in the longitudinal direction on the inner surface of the annular frame, which has a plurality of female locking parts recessed at predetermined positions on one end in the longitudinal direction. It has a plurality of frame parts each consisting of a winding drum that projects radially at the same intervals as the spacing, and a flange that projects almost perpendicularly to the other end of the winding drum, and the annular frame is connected to the end surface of the yoke. a winding frame which faces each of the stator poles and whose winding trunk is aligned with the end face of each of the stator poles and abuts both end faces of the stator core; A stator winding coil that is wound through a winding drum and whose lead wires are gathered on one side of the stator core, and a distance corresponding to the opposing distance between the flange of the frame and the annular frame. It has an annular shape having a width, and has a plurality of male locking portions protruding outward at predetermined positions on its outer periphery, and a plurality of cut grooves for leading out the lead wires, and a plurality of grooves for leading out the lead wires. A pair of retaining holes are provided at positions corresponding to the gaps, and the male locking portion is fitted into the female locking portion of the annular frame of the winding frame on the side where the lead wire is present. and a retaining insulator that is locked between the annular frame and the flange of the frame portion and abuts against a side surface of the winding coil, and the external lead wire is arranged in a U-shape in the pair of retaining holes of the retaining insulating plate. The electric motor is characterized in that the lead wire is passed through the external lead wire, the tip of which is led out to the outside of the retaining insulating plate, and the lead wire is connected to and fixed to the tip of the external lead wire. (2) The electric motor according to claim 1, wherein the lead wire is led out from the cut groove of the retaining insulating plate to the front side. (3) The connection portion between the external lead wire and the lead wire is selected to have a length that projects outward from the end surface of the stator.
The electric motor described in Section.