CN1220320C

CN1220320C - Stator for stepping motor

Info

Publication number: CN1220320C
Application number: CN 00136781
Authority: CN
Inventors: 高见治; 安田典彦
Original assignee: Pacific Industrial Co Ltd
Current assignee: Pacific Industrial Co Ltd
Priority date: 2000-12-26
Filing date: 2000-12-26
Publication date: 2005-09-21
Anticipated expiration: 2020-12-26
Also published as: CN1361582A

Abstract

The present invention relates to a stator for a step motor, which comprises a pair of coil auxiliary assemblies, wherein the coil auxiliary assemblies are connected with each other, each coil auxiliary assembly comprises a coil framework with terminal pins and a coil, and a pair of magnetic pole plates are arranged between the two coil framework; a resin moulded piece comprises a pair of annular sections for covering the periphery section of the two coil and connecting sections which extend from the two annular sections according to the mode of covering the terminal pins, the two coil auxiliary assemblies and the two annular sections of the resin moulded piece are covered by a pair of stator covers, and the connecting sections are protruded by corresponding to the two stator covers. When formed on the resin moulded piece, the connecting sections are formed by being used as one part of the resin moulded piece; therefore, the stator has the advantages of reduction of piece quantity and reduction of manufacturing cost.

Description

The stator of stepper motor

Technical field

The present invention relates to the stator of stepper motor, specifically, the present invention relates to into the stator that integral body is formed with the connector that is connected with the outside.

Background technology

General stepper motor comprises stator and rotor.This stator has solenoid.By to this solenoid supplying electric current, rotor just rotates.

But, in the coolant circuit of air conditioner, be equipped with the expansion valve of the flow of the cooling agent that is used for regulating coolant circuit.As this expansion valve, has the electric expansion valve that above-mentioned stepper motor is housed.This stepper motor is regulated the opening degree of electric expansion valve by computer control.In the electric expansion valve that in coolant circuit, is adopted, must improve the water resistance and the insulation property of stepper motor.For this reason, usually, said stator is covered by resin.

Fig. 7 represents the stator of the stepper motor of prior art.This stator comprises electromagnetic coil assembly 101, covers a pair of stator cover 102,103 of this electromagnetic coil assembly 101.This electromagnetic coil assembly 101 comprises a pair of coil rack 104,105, and this has coil 106,107 to coil rack; A pair of magnetic pole plate 108,109, this is installed on respectively on the coil rack 104,105 magnetic pole plate.A plurality of (in Fig. 7, only illustrating 1) terminal stitch 112 relative each coil rack 104,105 extend.The end that forms the multiple conducting wires of each coil 106,107 is connected with corresponding terminal stitch 112.Be installed on state on each coil rack 104,105 in magnetic pole plate 108,109, by two coil racks 104,105 are connected, thereby just obtain electromagnetic coil assembly 101.

Electromagnetic coil assembly 101 is covered by the said stator lid 102,103 with a plurality of magnetic pole tooths.The electromagnetic assembly 101 that is covered by stator cover 102,103 is also covered by resin moulded parts 110.This resin moulded parts 110 has protuberance 110a, on this protuberance 110a, connection shell 111 is installed.This terminal stitch 112 passes the inside of resin moulded parts 110, extends to connect shell 111 places.Connect by another connector (not shown) is connected shell 11 with this, electric current feeds to coil 106,107 just from the external device (ED) (not shown).

Resin moulded parts 110 forms in the following manner.At first, in the pattern of regulation, the electromagnetic coil assembly 101 that is equipped with stator cover 102,103 is set, and the connection shell 111 that forms as separate part in advance.At this state, flow in the pattern by making resin material, just form resin moulded parts 110.

In the prior art of above-mentioned Fig. 7, connection shell 111 must be independent of electromagnetic coil assembly and form.For this reason, number of components is more, and the making trouble of stator, and it is higher to make cost.

Resin moulded parts 110 almost covers whole stator cover 102,103.In other words, even for the part that need not waterproof and insulation, still cover by resin moulded parts 110.Like this, just cause the volume of stator bigger, and the consumption of the resin material adopted of being shaped is more, and surpasses essential value, cause the waste of resin material.

Summary of the invention

For overcoming above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of stator of stepper motor, it has easy manufacturing, and lower-cost advantage can realize miniaturization in addition.

To achieve these goals, the stator of stepper motor of the present invention comprises:

Coil rack;

Coiling skeleton and the coil that is provided with;

Relatively this coil rack and the terminal stitch that extends, the end that forms the lead of above-mentioned coil is connected with this terminal stitch;

Resin moulded parts, it comprises the annulus of the peripheral part that covers coil, and the connecting portion that extends according to the relative annulus of the mode that covers the terminal stitch, is provided with recess at the front end of connecting portion, the front end of terminal stitch exposes in the space of above-mentioned recess;

Cover the stator cover of the annulus of coil rack and resin moulded parts, the relative said stator lid of above-mentioned connecting portion is outstanding.

Description of drawings

Fig. 1 is the cutaway view of stator of the stepper motor of the first embodiment of the present invention;

Fig. 2 (a)～Fig. 2 (d) is the perspective view of the installation step of stator shown in Figure 1;

Fig. 3 is the cutaway view of stator of the stepper motor of the second embodiment of the present invention;

Fig. 4 (a)～Fig. 4 (e) is the perspective view of the installation step of stator shown in Figure 3;

Fig. 5 is the cutaway view of stator of the stepper motor of the third embodiment of the present invention;

Fig. 6 (a)～Fig. 6 (e) is the perspective view of the installation step of stator shown in Figure 5;

Fig. 7 is the cutaway view of stator of the stepper motor of prior art.

Embodiment

Below by Fig. 1～Fig. 2 (d), the first embodiment of the present invention is described.Fig. 1 represents the stator 50 of stepper motor.Shown in Fig. 1～Fig. 2 (d), this stator 50 comprises electromagnetic coil assembly 60, and a pair of

stator cover

8,9 that covers this electromagnetic coil assembly 60.

Electromagnetic coil assembly 60 comprises a pair of

coil pair assembly

1,2, and is arranged at a pair of

annular poles plate

3,4 in this

coil pair assembly

1,2 respectively.The first coil pair assembly 1 comprises coil rack 11, and is wound in the coil 12 on this coil rack 11.This coil rack 11 is arranged at the pair of flanges 11b at the axial two ends of this cylindrical portion 11a by

cylindrical portion

11a, 11c, and from one of them flange 11c, the terminal board 11d that extends towards radial outside constitutes.Three terminal stitch are wholy set on the terminal board 11d for 13 one-tenth.When molded coil skeleton 11, an end of each terminal stitch 13 is imbedded terminal board 11d.Perhaps, also can be after molded coil skeleton 11, in terminal stitch 13 built-in end daughter board 11d.

Coil 12 by such as, the mode of two Wire-wounds on this coil rack 11 formed.One end of each lead is connected with a shared terminal stitch 13.The other end of each lead is connected with each of remaining two terminal stitch 13.

The structure of the second coil pair assembly 2 is identical with the structure of the first coil pair assembly 1.That is, the second coil pair assembly 2 comprises coil rack 21, is wound in the coil 22 on the coil rack 21.This coil rack 21 is arranged at the pair of flanges 21b at the axial two ends of cylindrical portion 21a by

cylindrical portion

21a, 21c, and form towards the terminal board 21d that radial outside extends from one of them flange 21c.Three terminal stitch are wholy set on the terminal board 21d for 23 one-tenth.The end that constitutes two leads of coil 22 is connected with these terminal stitch 23.

At the inner peripheral of above-mentioned each

magnetic pole plate

3,4, be provided with a plurality of magnetic pole tooth 3a, 4a.By with

magnetic pole tooth

3a, 4a inserts the cylindrical portion 11a in the

coil

11,21, and 21a just is installed on it on

magnetic pole plate

3,4 pairing coil pair assemblies 1,2.Two

coil pair assemblies

1,2 are clipped in the middle

magnetic pole plate

3,4, are bonded with each other.Consequently, obtain electromagnetic coil assembly 60.

Electromagnetic coil assembly 60 is covered by water resistance and the good resin moulded parts 5 of insulation property.This resin moulded parts 5 comprises a pair of annulus 5a of the peripheral part that covers two

coils

12,22, capped end daughter board 11d, the connecting portion 5b of 21d and terminal stitch 13,23.In addition,

terminal stitch

13,23 according to basically with terminal board 11d, the mode bending that 21d is perpendicular.Relative two the annulus 5a of this connecting portion 5b are L word shape basically and give prominence to.At the front end of connecting portion 5b, be provided with recess 5c, the front end of

terminal stitch

13,23 exposes in the inner space of recess 5c.By another connector (not shown) is connected with this connecting portion 5b, just electric current is fed to coil 12,22 from the external device (ED) (not shown).

Connecting portion 5b is towards the below bending, and this recess 5c is towards lower opening.Thus, the

terminal stitch

13,23 that exposes in the inside of recess 5c is difficult to sticking water (original text: by water).

Above-mentioned two

stator cover

8,9 are placed on the electromagnetic coil assembly 60 according to the mode that covers electromagnetic coil assembly 60.Two

stator cover

8,9 are identical shape basically.Each

stator cover

8,9 comprises cylindrical portion, and the round plate that is arranged at an axial end of cylindrical portion.The relative part of the cylindrical portion of two

stator cover

8,9 engages by welding manner.Perhaps, two

stator cover

8,9 are fixed on the electromagnetic coil assembly 60 in the riveted joint mode.Cylindrical portion in each

stator cover

8,9 comprises

breach

8a, 9a, and this

breach

8a, 9a is corresponding with the section configuration of connecting portion 5b.Connecting portion 5b passes through

breach

8a, 9a, and relative two

stator cover

8,9 are given prominence to.

On the inner peripheral of the round plate in each

stator cover

8,9, be provided with two magnetic pole tooth 8b, 9b.Be placed on the state of electromagnetic coil assembly 60 two

stator cover

8,9,

magnetic pole tooth

8b, 9b inserts the cylindrical portion 11a in the

coil rack

11,21, among the 21a.Magnetic pole tooth 8b, the magnetic pole tooth 3a of 9b and corresponding

magnetic pole plate

3,4,4a alternately is provided with.

Assembly method to the stator 50 that constitutes in the manner described above is described below.

At first, shown in Fig. 2 (a) and Fig. 2 (b),

magnetic pole plate

3,4 is installed on each

coil pair assembly

1,2, and two

coil pair assemblies

1,2 are engaged, thus, obtain electromagnetic coil assembly 60.In addition,

terminal stitch

13,23 according to basically with terminal board 11d, the mode bending that 21d is perpendicular.

Then, shown in Fig. 2 (c), by the mode that resin moulded parts 5 covers, form resin moulded parts 5 according to electromagnetic coil assembly 60.Specifically, at first, in the pattern of regulation, electromagnetic assembly 60 is set.At this state, flow in the pattern by making resin material, be formed into the resin moulded parts 5 that integral body is formed with connecting portion 5b.

Then, shown in Fig. 2 (c) and Fig. 2 (d), two

terminal cap

8,9 are placed on the electromagnetic coil assembly 60.Consequently, make the stator 50 shown in Fig. 2 (d).

Present embodiment has following advantage:

When connecting portion 5b is shaped at resin moulded parts 5, form as the part of resin moulded parts 5.So, will not form as separate part by connecting portion 5b.Thus, number of components reduces, and stator 50 is easy to manufacture, and manufacturing cost reduces.

Resin moulded parts 5 covers whole electromagnetic coil assembly 60, only covers waterproof and the necessary part of insulation, specifically, only covers the

coil

12,22 that electric current flows through and the part of terminal stitch 13,23.So the amount that can make resin moulded parts 5 form the resin material of usefulness reaches necessary bottom line.

Two annulus 5a of resin moulded parts 5 are arranged in the peripheral part and the gap between the

stator cover

8,9 of coil 12,22.Thus, owing to have two annulus 5a,, in addition, also needn't strengthen

stator cover

8,9 according to the size of two annulus 5a itself so the constancy of volume of electromagnetic coil assembly 60 is big.So, can make the whole volume of stator 50 reach very little.

Below according to Fig. 3～4, be the center with difference with the embodiment of Fig. 1～Fig. 2 (d), the second embodiment of the present invention is described.In the present embodiment, adopt and the suitable coil rack 30 of form that two coil racks shown in Figure 1 11,21 is formed manufactured goods.Coil rack 30 comprises a pair of coil coiling portion (coil installation portion).That is, coil rack 30 comprises cylindrical portion 30a;

End flange

30b, 30c, this

end flange

30b, 30c are arranged at the axial two ends of this cylindrical portion 30a; Intermediate flange 30e, this intermediate flange 30e is arranged at the axial centre of cylindrical portion 30a.At intermediate flange 30e, be formed with the terminal board 30d that extends towards radial outside.Every group of two groups of terminal stitch, 31,32 opposite end daughter board 30d that comprise three extend.

End flange

30b, 30c are equivalent to the flange 11b among Fig. 2 (b), 21b.Intermediate flange 30c is equivalent to two flange 11c among Fig. 2 (b), and 21c is as the form of integral piece.Plectane portion in two

magnetic pole plate

3,4 imbeds intermediate flange 30e inside in advance.Terminal board 30d is equivalent to two terminal board 11d among Fig. 2 (b), the form that 21d is combined to form as integral piece.Terminal stitch 31 is equivalent to the terminal stitch 13 of Fig. 2 (b), and this terminal stitch 32 is equivalent to the terminal stitch 23 of Fig. 2 (b).

Assembly method to the stator 50 of present embodiment is described below.At first, shown in Fig. 4 (a) and Fig. 4 (b), imbed the mode of intermediate flange 30e inside, form coil rack 30 according to the disc plate in two magnetic pole plate 3,4.Specifically, two

magnetic pole plate

3,4 are arranged in the pattern of regulation.At this state, flow in the pattern by making resin material, obtain into the coil rack 30 that integral body is formed with two

magnetic pole plate

3,4.

Then, shown in Fig. 4 (c),, on coil rack 30, two

coils

12,22 are set by multiple conducting wires being wound on this coil rack 30.Then, with terminal stitch 31,32 according to the vertical substantially mode bending of terminal board, obtain electromagnetic coil assembly 60.

Then, identical with the embodiment of Fig. 1～Fig. 2 (d) shown in Fig. 4 (d), be the mode that resin moulded parts 5 covers according to electromagnetic coil assembly 60, form resin moulded parts 5.Afterwards, shown in Fig. 4 (d) and Fig. 2 (e), two

stator cover

8,9 are placed on the electromagnetic coil assembly 60, make stator 50.

The present embodiment of last mask body comprises the identical advantage with Fig. 1～Fig. 2 (d).In addition, in the present embodiment, molded in advance following single coil rack 30, the inside of this coil rack 30 is provided with two

magnetic pole plate

3,4, and has two coil coiling portions.Thus, the assembling work of stator 50 is easy.

Below according to Fig. 5～Fig. 6 (e), be the center with difference with the embodiment of Fig. 3～Fig. 4 (e), the second embodiment of the present invention is described.In the present embodiment, the shape of

stator cover

8,9 is different with the embodiment of Fig. 5～Fig. 6 (e).The axial length of the cylindrical portion in one of them stator cover 8 is corresponding with the axial length of electromagnetic coil assembly 60.Connecting portion 5b in the resin moulded parts 5 is by being formed at the breach 8a of the cylindrical portion in the stator cover 8, and relative stator lid 8 is outstanding.Remaining stator cover 9 does not have cylindrical portion, is identical with magnetic pole plate basically shape.That is, stator cover 9 is for having the magnetic pole plate of magnetic pole tooth 9.

The assembly method of the stator 50 of Fig. 6 (a)～Fig. 6 (e) expression present embodiment.The assembly method of the stator 50 of present embodiment is compared with the embodiment of Fig. 3～Fig. 4 (e), has following difference.That is, in the present embodiment, shown in Fig. 6 (a) and Fig. 6 (b), do not have the stator cover 9 of cylindrical portion, promptly magnetic pole plate 9 and

magnetic pole plate

3,4 when coil rack 30 molded, become to be wholy set on this coil rack 30 together.Specifically,

magnetic pole plate

3,4,9 are arranged in the pattern of regulation.At this state, flow in the pattern by making resin material, just obtain into integral body and have

magnetic pole plate

3,4,9 coil rack 30.

As shown in Figure 5, after being placed on stator cover 8 on the electromagnetic coil assembly 60, the circumference of the cylindrical portion in the stator cover 8 is according to the mode chimeric with the circumference of magnetic pole plate 9, towards inside bend.So stator cover 8 is firmly fixed on the electromagnetic coil assembly 60.

Above-mentioned present embodiment has the identical advantage of embodiment with Fig. 3～Fig. 4 (e).In addition, in the present embodiment, be molded as the single coil rack 30 that integral body has three

magnetic pole plate

3,4,9 in advance.For this reason, the assembling work of stator 50 is easy.

Embodiments of the invention are not limited to above-mentioned form, such as, it also can carry out proper transformation in the following manner.

In the embodiment of Fig. 5～Fig. 6 (e), magnetic pole plate 9 also can be in coil rack 30 molded after, be installed on this coil rack 30, also can after resin moulded parts 5 forms, be installed on the coil rack 30.

The quantity of coil is not limited to two, also can be one, also can be more than three.

The terminal stitch also can be not crooked, can be in the opposite end daughter board yet, along the state of straight direction extension.In this occasion, the relative electromagnetic coil assembly 60 of the connecting portion 5b in the resin moulded parts 5 radially extends.For this reason, preferably the terminal stitch that exposes in connecting portion 5b inside is carried out water-proofing treatment.

Claims

1. the stator of a stepper motor is characterized in that this stator comprises:

Coil rack;

Coiling skeleton and the coil that is provided with;

2. the stator of stepper motor according to claim 1 is characterized in that above-mentioned terminal is towards the below bending.

3. the stator of stepper motor according to claim 1 and 2, the magnetic pole plate that it is characterized in that having a plurality of magnetic pole tooths become to be wholy set on this coil rack when the molded coil skeleton.

4. the stator of a stepper motor is characterized in that it comprises:

The a pair of coil pair assembly that is bonded with each other, each coil pair assembly comprises the coil rack with terminal stitch, and coiling skeleton and the coil that is provided with, the end that forms the multiple conducting wires of two coils is connected with the terminal stitch;

A pair of magnetic pole plate with a plurality of magnetic pole tooths, these two magnetic pole plate are installed on respectively on the corresponding coil rack, and are arranged between two coil racks;

Resin moulded parts, it comprises a pair of annulus of the peripheral part that covers two coils, and according to the connecting portion of the mode that covers the terminal stitch from two annulus extensions, at the front end of connecting portion, be provided with recess, expose in the space of the front end of terminal stitch in recess;

A pair of stator cover, it covers two annulus of two coil pair assemblies and resin moulded parts, and relative two stator cover of above-mentioned connecting portion are outstanding.

5. the stator of stepper motor according to claim 4, it is characterized in that each coil rack comprises cylindrical portion, and the pair of flanges that is arranged at the axial two ends of cylindrical portion, each coil is between two flanges, be provided with around cylindrical portion, an extension in relative two flanges of terminal stitch, the flange that has in two coil racks of terminal stitch connects by described a pair of magnetic pole plate.

6. the stator of a stepper motor is characterized in that it comprises:

Coil rack, it has a pair of coil installation portion;

A pair of coil, it is arranged in above-mentioned two installation portions;

The terminal stitch, it is between two installation portions, and coil rack extends relatively, and the end that forms the multiple conducting wires of two coils is connected with the terminal stitch;

A pair of magnetic pole plate, it has a plurality of magnetic pole tooths, these two magnetic pole plate according to respectively with the corresponding mode of coil, when the molded coil skeleton, become to be wholy set on this coil rack;

Resin moulded parts, it comprises a pair of annulus of the peripheral part that covers coil, and the connecting portion that extends according to the relative annulus of the mode that covers the terminal stitch, is provided with recess at the front end of connecting portion, the front end of terminal stitch exposes in the space of above-mentioned recess;

A pair of stator cover, it covers two annulus of coil rack and resin moulded parts, and above-mentioned connecting portion relative stator lid is outstanding.

7. the stator of stepper motor according to claim 6, it is characterized in that above-mentioned coil rack comprises cylindrical portion, and the pair of end portions flange that is arranged at the axial two ends of this cylindrical portion, be arranged at the intermediate flange of the axial centre of cylindrical portion, above-mentioned coil installation portion is arranged between one of them end flange and the intermediate flange, and between another end flange and the intermediate flange, the relative intermediate flange of above-mentioned terminal stitch is extended, described a pair of magnetic pole plate is imbedded in the intermediate flange when the molded coil skeleton.

8. according to the stator of claim 6 or 7 described stepper motors, it is characterized in that each stator cover comprises cylindrical portion, and round plate, this round plate is arranged at an axial end of cylindrical portion, and have magnetic pole tooth, two stator cover are installed on the coil rack after forming resin moulded parts.

9. according to the stator of claim 6 or 7 described stepper motors, it is characterized in that one of them stator cover comprises cylindrical portion, and round plate, this round plate is arranged at an axial end of cylindrical portion, and has magnetic pole tooth, another stator cover is formed by the round plate with magnetic pole tooth, and when the molded coil skeleton, becomes to be wholy set on this coil rack.