JPS6181165A - Step motor - Google Patents

Abstract

PURPOSE:To improve the workability and to accurately set the position accuracy of a stator by supporting the stator to an elastic unit such as an O-ring or the like, and securing the stator with resin, thereby preventing resin from flowing out. CONSTITUTION:A step motor is composed of a rotor 1 mounted with a disc- shaped magnet 4 on a shaft 2, housings 5, 6 formed radially with bottomed stator securing groove groups 7, 8 and a stator 17 made of U-shaped stator pieces 17a, 17b secured to the groups 7, 8. In this case, a ring-shaped groove 22 for containing an O-ring with the same bottom as the groups 9, 10 is formed, an O-ring 19 filled in the groove 22, and then the stators 17a, 17b are inserted into the grooves 9, 10. Thus, resin if filled, the coils 20, 20' are inserted, the projection B of the stator end 24 is retained by a jig, and resin is cured. Thus, the grooves 9, 10 are bottomed to eliminate the flowout of the resin, the end 24 of the stator 17 is effectively brought in coincidence with the housing end 5a by the elastic action of the ring 19, thereby stabilizing a gap G.

Description

[Detailed description of the invention] 〔Technical field〕 This invention relates to a step motor.

[Background technology]

A step motor is one in which a large number of magnetic poles are formed in the circumferential direction of the periphery of a rotor having disc-shaped magnets, the periphery is located in the gap of the stator, and a coil is provided in the stator.
In order to increase the ratio of I:I to the stator, it is necessary to narrow the gap between the stator and the stator, and to keep the gap constant, conventionally, as shown in FIG. Stator 52 to stator fixed i51
The stator 52 was fixed to the housing 50 by press-fitting the resin into the housing 50 while holding the end face of the stator 52 in a fixed position with the jigs 53 and 54.

55 is a coil.

However, the stator fixed fJ51 of the housing 50
Since the housing 50 is penetrated, the resin tends to flow out of the housing 50, which poses a problem in terms of work. In addition, there was also a drawback that 414 resin did not flow sufficiently into the stator fixing a51 because the coil 55 was inserted and the resin was press-fitted.

[Purpose of the invention]

The purpose of this invention is to prevent the above-mentioned outflow of resin, and ii. i
The object of the present invention is to provide a step motor whose stator can simply be fixed in a fixed position to the housing.

[Disclosure of the invention]

The present invention includes a housing in which a bottomed stator fixing groove is formed, an elastic body disposed at the bottom of the stator fixing groove, and an insertion end of the housing inserted into the stator fixing groove and supported by the elastic body. A stator is fixed with a press-fit resin, and a coil is wound around the stator, and a gap is formed between the pair of stators by aligning the pair of housings to which the stator is fixed, forming a disc-shaped rotor. The magnetic pole portion of the periphery of the magnet is located in the gap. Due to the elastic body on the bottom of the stator fixing groove,
Since the stator is pressed to a predetermined height and fixed with press-fit resin, the stator does not lose its ellipticity and there is no resin leakage as in the case of conventional methods, and it can be filled with enough resin and fixed securely. .

One embodiment of the present invention is shown in FIGS. 1 to 1θ, and in FIG. They are formed on both sides of the peripheral edge and are regularly spaced alternately at regular intervals in the circumferential direction.

5.6 is a housing, and as shown in Fig. 2, four bottom stator fixing groove groups 7.8 are formed radially with respect to the center, and each fixing groove group 7.8 has a center interval of 2π (electrical angle). 2π is the distance from the magnetic pole of the rotor 1, for example, from NViA to the adjacent N pole), and the fixing grooves 7.8 are spaced apart from each other by π/2 in electrical angle, for example, n. (integer)×2π±π/2, 6.5 in the example
They are separated by π.

In addition, a pair of arc-shaped coil storages 411 are provided in the housings 5 and 6.
．． 11', a bearing 12°12' is provided at the center, and a recess 13 for drawing out the lead wire is formed at the edge of the opening.

Reference numeral 14 denotes a mounting plate, and 15 a holding plate, which are integrally assembled by fixing the housings 5 and 6 between the mounting plate 14 and the holding plate 15 with bolts 16.

Each stator 17 is a substantially U-shaped stator piece 17a.

17b butt against each other to form a gap G into which the peripheral edge of the magnet 4 of the rotor 1 enters, and each stator piece 17a.

17b is formed by overlapping a plurality of thin plates 18 for each stator fixing tR9, tR10 to prevent eddy currents. FIG. 4 shows the positional relationship of the stator with respect to the magnetic pole parts N and S, and each of the stators 17 divided by the fixed groove groups 7 and 8 as described above is connected to the magnetic pole part N of the magnet 4 by the fixed grooves 9 and 10.
, are arranged at an angle equal to the electrical angle 2π of S, and as mentioned above, the fixed groove groups 7.8 are shifted by π/2, so a voltage as shown in FIG. 5 is applied to the coil 20.20'. By applying this, the rotor 1 rotates in the P direction.

FIG. 6 is an exploded perspective view of the housing block;
is an O-ring made of elastic material such as rubber, and 22 is fixed to the stator! 9. Fix stator across 10/aS9,1
Ring shape a (9th
10). First, the O ring 19 is inserted into the ring-shaped groove 22, and then the stators 17a, 17+) are inserted into the fixing/119.10. Then press fit the Epoquin resin. Then coil 20.20
' to 14 people. FIG. 7 is a diagram showing the stator 17a and ITb inserted, and the stator 17a and I7b are shown in FIG.
protrudes from the end surface 5a of the opening of the housing 5 by a slight barb B (the same applies to the case of the housing 6). In FIG.
This is where the stator end face 24 is flush with the housing end face 5a. In this state, if you put the whole thing in a dryer and harden the resin, you will get the stator 17 and coils 20 and 20.
' is fixed to the housing 5. Since the stator end face 24 is fixed in close contact with the jig 23 due to the elastic action of the O-ring 19, the stator 17 is fixed at a fixed position. Note that 21 is a coil lead wire.

In such a configuration, the step motor is fixed to the stators of the housings 5 and 6? ! 9. Since the lO has a bottom, there is no need to worry about the resin flowing out, and since the resin can be press-fitted before inserting the coils, each stator 17 is sufficiently filled with resin and there is no shortage of filling.

Furthermore, due to the elastic action of the O-ring I9, the end face 2 of the stator 17
4 is surely aligned with the housing end face 5a, and the stator 17
The gap between the rotor L and the rotor L becomes stable.

〔Effect of the invention〕

According to the invention, the stator is supported by an elastic body such as an O-ring, and the stator is fixed with resin, so there is no resin leakage, improving work efficiency and ensuring the positioning accuracy of the stator. There is a young fruit called.

[Brief explanation of the drawing]

Figure 1 is a sectional view of one embodiment of this invention, Figure 2 is a plan view of one side of the housing with the stator inserted, and Figure 3 is an exploded view! Fig. 4 is an explanatory diagram showing the positional relationship of the stator, Fig. 5 is a time chart of the voltage applied to the coil, Fig. 6 is an exploded perspective view of the stator part, and Fig. 7 is an illustration with the stator inserted. 8 is a sectional view of the cover 6 holding the stator with a jig, FIG. 9 is a plan view of one side of the housing, FIG. 10 is a sectional view taken along line X-X, and FIG. 11 is a conventional example. FIG. l... Rotor, 4... Disk method magnet, 5.6... Housing, 9.10... Stator fixing groove, 17...
Stator, 17a, 17b... Stator piece, 19...
・O-ring (elastic body), 20.20'...Coil, G
...Gear knob No. 12 4 Fig. 5 52 10 Weld 6 Fig. 8 Fig. 0 10

Claims (1)

[Claims] A housing formed with a bottomed stator fixing groove, an elastic body disposed at the bottom of the stator fixing groove, and an insertion end of the housing inserted into the stator fixing groove is supported by the elastic body and fixed with press-fit resin. A gap is formed between the pair of stators by overlapping the pair of housings in which a coil is wound around the stator and the stator is fixed, and the magnetic poles on the periphery of the disc-shaped magnet of the rotor are provided. A step motor with a portion located in the gap.