JPH033652A - Stepping motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a PM (permanent magnet) type stepping motor used, for example, for feeding a magnetic head of a floppy disk drive.

[Prior Art] For example, a conventional PM type stepping motor used for feeding a magnetic head of a floppy disk drive has two stators arranged side by side and combined with one rotor. These stators 1 and 2 are shown in FIGS. 7 and 8.
As shown in the figure, it has two winding frames 4°4 each having a winding wire 3 wound thereon, and each winding frame 4 has a comb-shaped salient pole 5a that fits inside its body along its inner surface. An end yoke 5 having a similar shape and an intermediate yoke 6 having a similar comb-like salient pole 6a are disposed with the comb-like salient poles 5a and 6a interdigitated with each other. Further, each intermediate yoke 6.6 has its back-to-back portions 6b, 6b stacked on top of each other, and constitutes an integral motor case 7.

Inside this motor case 7 are the two winding frames 4,
4 are stored. Incidentally, the motor casing is connected and fixed to a motor frame 12 consisting of frame end plates 9 and 10 fixed to the outer peripheral wall of the end yoke 5, respectively.

A magnet portion 13a of the rotor 13 is disposed in the hollow portion of the motor case 7 and extends inside the two stators 1.2.

This rotor 13 is rotatably supported, and the above-mentioned salient poles 5a in the magnet portion 13a of this rotor 13,
A magnetic pole is magnetized on the outer peripheral portion facing 6a. Further, as shown in FIG. 7, the shaft portion 13a of the rotor 13 is supported by a pivot ball bearing (not shown) that receives the shaft portion 13a of the rotor 13 on the opposite side by a leaf spring 14 which is fixedly fixed to the frame end plate 9. .) is biased toward the side.

Further, as shown in FIG. 8, lead wires 16 and 16 are connected to each terminal of the winding 3 wound around each of the winding frames 4, 4 in the motor case 7, respectively. The connecting portions 17 17 of each lead wire 16 , 16 are located inside the winding frames 4 , 4 in the motor case 7 . Each lead wire 16.16 is connected to a notch opening 1 formed at the abutting edge of a pair of end yokes 5°5 constituting the motor case 7.
8 to the outside of the motor case 7.

The conventional motor configured as described above was assembled as follows. First, one intermediate yoke 6 is fitted to one winding frame 4 by hand. Through this fitting, the salient poles 6a of the intermediate yoke 6 fit into the inner surface of the body of the winding frame 4, and are prevented from rotating in the circumferential direction by engagement with positioning means (not shown).

Next, one end yoke 5 to which the frame end plate 9 is fixed
Next, one of the winding frames 4 and the intermediate yoke 6 are manually housed so that the lead wires 16 and 16 pass through the notch openings 18, and one of the stators 1 is assembled. Furthermore, after the other end yoke 5 and the other intermediate yoke 6 are fitted together by the same procedure as above, they are housed in the other end yoke 5 to assemble the other stator 2. Then, the rotating shaft 13a of the rotor 13 is inserted through the metal bearing 19 provided on the other stator 2, and the rotor 13
The magnet portion 13a is placed inside the other stator 2, and the one stator 1 is placed over the other stator 2 while the magnet portion 13a is placed inside. By this operation, the back-to-back portions 6b of the intermediate yoke 6 are positioned so as to overlap each other. Finally, after connecting the mating surfaces of the pair of stators 1.2 by welding, this motor assembly is attached to the motor bracket 16,
Complete the assembly.

[Problems to be Solved by the Invention] As described above, in the conventional device, the lead wire 16 connected to the winding 3 is drawn out from the winding frame 4, but the lead wire 1
Since the lead wire 6 wanders freely and its shape and position change freely, it is necessary to manually pass the lead wire 16 through the notch opening 18. Its use has been a hindrance to automatic assembly.

Therefore, as shown in Figures 4 and 5, two winding frames 4 are
．． A portion of the abutting portions of the two end yokes 5 is formed to protrude, and this protruding portion 20 protrudes outward from a notch opening 18 formed at the abutting edges of the pair of end yokes 5. 4, lined up with two on each side
Book conductive bottles 21a, 21. b, 22a, and 22b are made to protrude.

Then, each end of the winding 3 wound around each of the winding frames 4, 4 is crossed and led out from the notch opening 18, and is individually connected to conductive pins 21a, 21b, 22a.

22b.

When winding the winding 3 around each of the winding frames 4, 4, as shown in FIG. Fix the connection. Next, after winding the winding 3, the end of the winding intersects the start end of the winding, and the wire is wound around the other conductive bottle 21b for connection and fixation.

In this way, since the ends of the winding 3 are connected and fixed to the conductive pins 21a and 21b by being guided outside the motor case 7, the connection work is not done manually but can be automatically assembled by an automatic assembly machine. I can do it.

However, even this method has the following problems. That is, the automatic assembly machine connects the winding start end and winding end of the winding 3 to the corresponding conductive bins 21a.
, 21b for connection and fixation, it is necessary to keep a relatively large distance between the left conductive bottles 21a, 21b and the right conductive bottles 22a, 22b. Therefore, as shown in FIG.
The width A in the left-right direction becomes considerably large.

For this reason, the length of the winding in the left and right direction of each winding frame 4, 4 is limited, and the amount of winding is small. This causes a decrease in the motor's performance, and there is also the drawback that increasing the motor's performance requires increasing the size of the motor as a whole.

Furthermore, as shown in FIG. 5, the winding 3 wound around each winding frame 4, 4 is wound while crossing the starting end and the winding end.
It is led out through the notch opening 18. This is to prevent the starting end of the winding 3 from coming into contact with the ending end of the winding 3 on the opening edge of the notch opening 18, but in this way, the intersecting windings will not end at the starting end. If the wire is wrapped around the wire, the ends will rub and be easily damaged, causing electrical leakage.

The present invention has been made in view of the above-mentioned problems, and its purpose is to increase the length of the winding in the left and right direction of the winding frame, increase the amount of winding, and improve the motor's performance. Another object of the present invention is to provide a stepping motor having a structure that can be miniaturized, eliminate the need to cross the starting end of the winding and the terminal end of the winding, and eliminate the cause of electrical leakage due to contact. .

[Means and effects for solving the problem] The present invention has an end yoke and an intermediate yoke that have comb-like salient poles that are inserted alternately along the inner surface of the body of a winding frame around which a winding wire is wound. The two stators formed by combining the two stators are arranged with their back-to-back parts provided with intermediate yokes overlapped, and these are supported by a motor frame, and the outer peripheral parts are magnetized inside the two sets of stators. Along with arranging the rotor,
In a stepping motor in which the rotor is rotatably supported by the motor frame, an electrically insulating protrusion provided at the back-to-back portion of the two intermediate yokes and protruding outward from the notch opening of the motor case; The protruding portion is provided with four conductive bins that are arranged and protruded along the rotational direction of the rotor and connect each end of the winding of each stator, and each winding of each stator has its starting end facing outward. Each winding has its terminal end connected to a different conductive bottle inside.

Therefore, even if the starting end of the winding and the ending end of the winding do not cross each other, they can be led out from the notch opening and the respective conductive bottles can be connected. Furthermore, it is possible to prevent electrical leakage due to contact between the lines.

Also, since each conductive bottle is arranged in a row along the direction perpendicular to the axial direction of the stepping motor,
The thickness of the portion of the protruding portion where this is provided is sufficient as long as one row of the protruding portion can be provided, and the thickness can be made thin. Therefore, since the length of the winding frame in the axial direction can be increased by this amount, the number of turns of the winding can be increased, and a small and high-output motor can be provided.

Furthermore, since the conductive bottles are arranged in a line along the direction perpendicular to the axial direction of the stepping motor, a sufficient distance between them can be ensured compared to the conventional arrangement in which they are arranged side by side.

[Embodiment] FIGS. 1 to 3 show a stepping motor according to an embodiment of the present invention. This stepping motor is PM
(permanent magnet) type structure, and its basic configuration is the same as that of the above-mentioned conventional example, so similar structural parts are given the same reference numerals and detailed explanation thereof will be omitted.

The features of this embodiment are as follows.

That is, an electrically insulating protrusion 20 is formed at the abutting portion of the two winding frames 4 , 4 so as to partially protrude and protrude outside the motor case 7 through the notch opening 18 . This protrusion 20 connects to the intermediate yoke 6.6 of the stator 1°2,
The electrically insulating winding frames 4.4 are made integral with each other by insert molding the intermediate yokes 6, 6 when the winding frames 4, 4 are molded in plastic. The length B of the protrusion 20 in the rotational direction of the rotor 13, that is, the length B in the direction perpendicular to the axial direction of the stepping motor, is larger than the winding diameter C of the winding frame 4.4.

Four electrically conductive bottles 21a, 21b, and 22b extend from the protruding end surface of the electrically insulating protrusion 20 that protrudes from the notch opening 18 to the outside of the motor case 7.

Push out 22a. Moreover, this conductive bottle 21a.

21b, 22b, and 22a are arranged in one row along the rotational direction of the rotor 13. That is, they are arranged along a direction perpendicular to the axial direction of the stepping motor. In addition, each conductive bottle 21a, 21b, 22b, 22
The distance a is such a length that the end of the winding 3.3 can be connected thereto by an automatic machine.

And the conductive bottles 21a, 21b, 22b.

2-28 to which each end of the winding 3.3 is connected in a manner to be described below. That is, it is processed as follows. first,
For winding, the starting end 3a is wrapped around conductive bottles 21a, 21b, 22b, 2
2a, the winding is done on the outer conductive bottle 21 on the starting end 3a side.
Wrap it around a. Subsequently, winding work is performed on the corresponding winding frame 4. Then, wrapping the terminal end 3b with the conductive bottle 21a,
For example, the inner conductive bottle 2 among 21b, 22b, and 22a
l b +,: Wrap around. Finally, the conductive bottle 21a is wrapped around the starting end 3a, and the final end 3b is wrapped around the conductive bottle 21a.
Soldering is performed on the part of the conductive bottle 21b around which the conductive bottle 21b is wrapped. Thereby, the winding of the winding 3 can be automatically performed by an automatic winding assembly machine. Further, the other windings 3 are processed in the same manner, and their starting ends 3a are wound around the outer conductive bins 22a on the opposite side. Subsequently, winding work is performed on the corresponding winding frame 4. The winding then wraps the terminal end 3b around the inner conductive pin 22b. Finally, the winding is performed on the conductive bottle 22a around which the starting end 3a is wound.
Then, the portion of the conductive bottle 22b around which the terminal end 3b is wound is soldered.

Note that a circuit board (not shown) is connected to the conductive pins 21a, 21b, 22b, and 22a to which each end of the winding 3 has been connected in this manner.

Thus, the conductive pins 21a, 21b, 22b, 22a, which respectively connect each end of the winding 3.3, are stepped onto the protruding end surface of the protrusion 20 protruding from the notch opening 18 of the motor case 7 to the outside of the motor case 7. The windings 3 are arranged in a row along the direction perpendicular to the axial direction of the motor, and the windings 3 are wound with the starting end 3a connected to the outer conductive bin 21a (or 22a).
), and for winding, connect the terminal end 3b to the inner conductive bottle 21b (
or 22b), the winding can be led out from the notch opening 18 and connected to each conductive bottle 2 without crossing the starting end 3a and the ending end 3b.
1a, 21b, 22b, and 22a. Furthermore, it is possible to prevent electrical leakage due to contact between the lines.

Further, since the conductive bottles 21a, 21b, 22b, and 22a are arranged in one row along the direction perpendicular to the axial direction of the stepping motor, the thickness A of the portion of the protrusion 20 where these are provided is one row. A sufficient thickness is sufficient as long as the thickness A can be made thinner. Therefore, the length of the winding frame 4 in the axial direction can be increased by this amount. Therefore, the number of turns of the winding 3 can be increased, and a small, high-output motor can be provided.

Furthermore, each conductive bottle 21a, 21b, 22b.

Since the motors 22a are arranged in a line along the direction perpendicular to the axial direction of the stepping motor, a sufficient spacing can be secured compared to the conventional arrangement in which the motors 22a are arranged side by side. Therefore, a stable insulation distance can be maintained, and processing during automatic assembly becomes easier. Therefore, the quality of the motor can be improved and an inexpensive motor can be provided.

Further, the length of the protrusion 20 in the rotational direction of the rotor 13, that is, the length B in the direction perpendicular to the axial direction of the stepping motor, must be larger than the winding diameter C of the winding frames 4, 4. Therefore, the winding of the winding 3 is the starting end 3a and the winding is the ending end 3.
b, and the insulation distance can be increased.

Note that the present invention is not limited to the above embodiments. For example, the winding 3 is wound by connecting the terminal end 3b to the inner conductive pin 21b adjacent to the outermost conductive pins 21a and 22a.
Instead of connecting to 22b, it may be connected to the other ones inside.

[Effects of the Invention] As described above, according to the present invention, the winding can be led out from the notch opening and connected to each conductive pin without crossing the starting end and the ending end of the winding. This can prevent electrical leakage due to contact between the lines.

Further, since the plurality of conductive pins are arranged in a row along the direction perpendicular to the axial direction of the stepping motor, the thickness of the protruding portion where the conductive pins are protruded can be reduced.

Therefore, the length of the winding frame in the axial direction can be increased by this amount, and the number of turns of the winding wire can be increased, so that a small, high-output motor can be provided.

Furthermore, since the conductive pins are arranged in a line in a direction perpendicular to the axial direction of the stepping motor, sufficient spacing between them can be ensured compared to the conventional arrangement in which the conductive pins are arranged side by side. Therefore, a stable insulation distance can be maintained, and
Processing during automatic assembly becomes easier. Therefore, the quality of the motor can be improved and an inexpensive motor can be provided.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a side sectional view of the entire motor, FIG. 2 is an exploded perspective view of the entire motor, and FIG. 3 is a longitudinal sectional view of the entire motor. Figures 4 to 6 show examples of conventional motors, where Figure 4 is a side sectional view of the entire motor, Figure 5 is a vertical sectional view of the entire motor, Figure 6 is a plan view of the vicinity of the conductive bottle, and Figure 6 is a side sectional view of the entire motor. 7 and 8 show still another example of a conventional motor, with FIG. 7 being a side sectional view of the entire motor, and FIG. 8 being a longitudinal sectional view of the entire motor. 1.2... Stator, 3... Winding, 3a... Winding is at the start end, 3b... Winding is at the end, 4... Winding frame, 7...
・Motor case, 18... Notch opening, 20...
Projecting portions, 21a, 21b, 22b, 22a--conducting wire bin.

Claims (1)

[Scope of Claims] Two stators are formed by fitting end yokes and intermediate yokes with comb-like salient poles that are inserted alternately along the inner surface of the body of a winding frame around which a winding is wound, The back-to-back parts of the intermediate yoke are arranged one on top of the other, and these are supported by a motor frame. A rotor whose outer peripheral part is magnetized is arranged inside the two sets of stators, and this rotor The stepping motor is rotatably supported by the motor frame, and includes an electrically insulating protrusion provided at the back-to-back portions of the two intermediate yokes and protruding outward from the notch opening of the motor case; and four electrically conductive pins that are juxtaposed and protrude along the rotational direction of the rotor and connect each end of each stator winding, respectively, and each winding start end of each stator winding is connected to a different outer electrically conductive pin. A stepping motor characterized in that the ends of each winding are respectively connected to different conductive pins inside.