CN203813638U - rotating electrical machine - Google Patents

Abstract

A rotary electric machine is provided, adhesion of dust or dirt or the like is prevented and high resolution is ensured, so that a rotation direction position of a rotor can be detected with high precision. The rotary electric machine is provided with a stator (13); the rotor (21) oppositely configured at the inner side of the stator (13) in the radial direction across a magnetic gap (2); a rotary cover (22) which is connected with the rotor (21) and covers an end portion of an upper side of the stator (13) in the axial direction, a specified inner space (4) being formed between the rotary cover (22) and the stator (13); a rotary disc (28) disposed in the inner space (4) in a manner of rotating along with rotation of the rotary cover (22); and a detection portion (18) disposed in a housing (11) and used for performing optical detection or magnetic detection for the position of the rotary disc (28).

Description

rotating electrical machine

technical field

The embodiments disclosed by the utility model relate to a rotating electric machine.

Background technique

There are known rotating electrical machines having a stator, a rotor and a housing in which these are built. For example, in the rotating electric machine described in Patent Document 1, the shaft of the fixed rotor protrudes outside the housing, and a substantially disk-shaped rotating disk is provided on the protruding portion. The position in the rotational direction of the rotor is detected by detecting a scale provided on the rotary disk with a position sensor.

In addition, for example, the rotating electric machine described in Patent Document 2 is configured as a so-called inner rotor type in which a rotor is provided radially inside a stator. A plurality of magnets are arranged in a circumferential direction on a radially outer peripheral portion of the rotor, and the plurality of magnets are detected by a Hall element provided in the stator.

Patent Document 1: Japanese Patent Laid-Open No. 2007-178235

Patent Document 2: Japanese Patent Application Publication No. 5-25973

In the prior art described in the aforementioned Patent Document 1, as described above, a rotating disk is provided outside the casing, and a stator and a rotor are arranged to face each other inside the casing. As a result, the rotating disk can be formed to have a relatively large diameter, so that, for example, a plurality of slits can be provided on the outer peripheral portion of the disk to ensure high resolution. However, since the rotary disk is exposed outside the housing and exposed to the surrounding environment, there is a possibility that the detection accuracy may decrease due to adhesion of dust or dust.

In addition, the prior art described in the above-mentioned Patent Document 2 is an inner rotor type, and the stator is located radially outside of the rotor. Therefore, there is a restriction on the outer diameter of the rotor, and the diameter is relatively small. As a result, since the circumference of the rotor is relatively short, it is difficult to secure high resolution by arranging many magnets on the outer circumference of the rotor, resulting in a decrease in detection accuracy. In addition, no special consideration has been given to dustproofing the housing in which the rotor and stator are arranged. If dust or dust that has penetrated into the housing adheres to the Hall elements, detection accuracy may be reduced.

Utility model content

The present invention has been made in view of such problems, and its object is to provide a rotating electric machine capable of detecting the position in the rotational direction of the rotor with high precision by preventing the adhesion of dust or dust and ensuring high resolution. .

In order to solve the above-mentioned problems, according to an aspect of the present invention, the rotating electric machine is characterized in that: a stator; a rotor disposed radially inward of the stator with a magnetic gap therebetween; The rotor is connected and covers the axial end of the stator to form a predetermined inner space between the cover and the stator or a fixed member fixed to the stator; the detected member follows the The rotation of the cover is provided in the internal space or provided to face the internal space in a manner of rotating together with the rotation of the cover; and a detection part is provided in the stator or the fixed part and has Perform optical or magnetic detection.

In the rotating electrical machine, the member to be detected is provided radially outside the rotor so as to extend radially in the internal space on the other axial side of the cover. For the detected disc, the detection unit is provided on the stator or the fixing member so as to face the inner space, and optically detects the position of the detected disc.

In the rotating electric machine, the cover includes: a flat plate portion extending in the radial direction; and a cylindrical portion extending from the flat plate portion along the radially outer side on the stator side. The axial extension is provided, and a predetermined dustproof passage communicating with the radially outer peripheral portion of the internal space is formed between the cylindrical portion and the stator or the fixed member, and the detected The disc has an outer diameter equal to the outer diameter of the flat plate portion.

In the rotating electrical machine, the detected member is a plurality of magnets respectively provided at a plurality of positions along the circumferential direction of the cover so as to face the internal space, and the detection unit It is provided in the stator or the fixing member so as to be able to face the magnet in the internal space, and magnetically detects the position of the magnet.

In the rotating electric machine, the cover includes: a flat plate portion extending in the radial direction; and a cylindrical portion extending from the flat plate portion along the radially outer side on the stator side. The axial extension is provided, and a predetermined dustproof passage communicating with the radially outer peripheral portion of the internal space is formed between the cylindrical portion and the stator or the fixing member, and the plurality of The magnet is provided on the inner peripheral side of the cylindrical portion, and the detection unit is provided on the stator or the fixing member so as to face the magnet radially outward.

In the rotating electrical machine, the rotating electrical machine further includes: a bearing that rotatably supports the rotor; and a base portion that fixes at least one of the bearings, and the rotor has a The bearing fixing portion of the at least one bearing is sandwiched and fixed to one side and the other axial side.

In the rotating electrical machine, the base part is characterized in that the first bearing on one side of the axial direction and the second bearing on the other side of the axial direction are respectively fixed to the base part, and the bearing fixing part includes: a first bearing a part, which fixes the first bearing from one side in the axial direction; and a second part connected to the first part, which fixes the second bearing from the other side in the axial direction, and The outer side is provided with a permanent magnet opposed to the radial inner side of the stator.

Utility Model Effect

According to the rotating electric machine of the present invention, the position in the rotational direction of the rotor can be detected with high precision by preventing adhesion of dust or dust and ensuring high resolution.

Description of drawings

FIG. 1 is a longitudinal sectional view showing the overall structure of a rotating electrical machine according to an embodiment.

Fig. 2 is a perspective view of the rotary cover and the annular boss viewed from the back side.

Fig. 3 is an enlarged sectional view of a main part of Fig. 1 .

4 is a longitudinal sectional view showing the overall structure of a rotary electric machine according to a modified example in which detection is performed by a magnetic encoder method.

Fig. 5 is a perspective view of the rotary cover viewed from the rear side.

Fig. 6 is an enlarged cross-sectional view of a main part of Fig. 4 .

Label description

1: rotating motor;

2: magnetic gap;

4: Internal space;

10: fixed part;

11: shell;

12: Basic department;

13: stator;

14: bearing;

15: laminated iron core;

16: armature coil;

17: shielding plate;

18: Testing Department;

20: rotating part;

21: rotor;

22: rotating cover (cover);

22b: flat plate part;

22c: cylindrical part;

23: output shaft;

24: rotating side auxiliary parts;

25: permanent magnet;

28: Rotary disk (disc to be detected, component to be detected);

38S, 38N: magnetized part (magnet, detected part).

Detailed ways

Hereinafter, disclosed embodiments will be described with reference to the drawings.

<Overview of Rotary Electric Machine>

First, the configuration of a rotating electric machine 1 according to the present embodiment will be described using FIG. 1 . As shown in FIG. 1 , the rotating electrical machine 1 is an inner rotor type direct drive motor (hereinafter referred to as a DD motor) including a fixed portion 10 and a rotating portion 20 , and includes the rotating portion 20 inside the fixing portion 10 .

<fixed part>

The fixed part 10 has a substantially cylindrical case 11 (corresponding to a fixed member), a base part 12 , a stator 13 , and two bearings 14 , 14 . In addition, the number of bearings 14 is not limited to two, as long as it is one or more. Between the two bearings 14, 14, two layers of inner and outer pads 14A, 14B are disposed. The pad 14A on the inner peripheral side is on the fixed side, the pad 14B on the outer peripheral side is on the rotating side, and the pads 14A, 14B are positioning members inside the two bearings 14 , 14 .

The housing 11 accommodates most of the components included in the rotating electric machine 1 therein.

The base portion 12 integrally includes a base portion 12a and a fixed shaft portion 12b. The base portion 12 a has a disc shape having an outer diameter substantially equal to that of the casing 11 . The base portion 12 a closes the opening end on the other axial side (lower side in FIG. 1 ; the same applies hereinafter) of the casing 11 . The fixed shaft portion 12 b has a hollow tubular shape protruding from the radial center of the base portion 12 a toward one side in the axial direction (upper side in FIG. 1 ; the same applies hereinafter). That is, the fixed shaft portion 12b penetrates through the radial center position of the housing 11 . A fixed-side auxiliary member 19 is provided on the protruding end side (upper side in FIG. 1 ) of the fixed shaft portion 12b. The fixed-side auxiliary member 19 is formed thick on the outer side of the one bearing 14 , and sandwiches the one bearing 14 with the spacer 14A on the inner peripheral side.

The stator 13 includes a laminated iron core 15 arranged on the inner peripheral surface of the case 11 , and an armature coil 16 wound around the laminated iron core 15 . A plurality of armature coils 16 are provided on the laminated core 15 so as to line up in the circumferential direction on the inner peripheral surface of the housing 11 .

<rotating part>

The rotating unit 20 has a rotating cover 22 and a rotor 21 disposed opposite to each other on the inner side in the radial direction of the stator 13 with the magnetic gap 2 interposed therebetween. In addition, the rotary cover 22 will be described later.

<rotor>

The rotor 21 has an output shaft 23 , a rotation-side auxiliary member 24 , and a permanent magnet 25 arranged radially outside of the output shaft 23 . In addition, the rotating cover 22 and the rotating disk 28 are demonstrated later.

The output shaft 23 has a substantially hollow tubular shape as a whole, and a flange portion 23 a is formed at an upper end portion in FIG. 1 . The rotation side auxiliary member 24 is arranged between the outer peripheral surface of the above-mentioned fixed side auxiliary member 19 and the inner peripheral surface of the output shaft 23 . Further, the output shaft 23 is coupled to the rotation side auxiliary member 24 by bolts 26 in a state where the flange portion 23 a is located on the opening end side (upper side in FIG. 1 ) of the housing 11 . Thus, the combined body of the output shaft 23 and the rotation side auxiliary member 24 is rotatably supported by the fixed shaft portion 12b via the bearings 14, 14′ (restricted in the axial direction). In addition, the rotation-side auxiliary member 24 functions as a first member that fixes one (upper side in FIG. 1 ) bearing 14 (corresponding to the first bearing) from one side in the axial direction. Furthermore, the output shaft 23 serves as the bearing 14 (corresponding to the second bearing) that fixes the other side (the lower side in FIG. 1 ) from the other side in the axial direction, and has a radially inner side facing the stator 13 on the radially outer side. The second member of the permanent magnet 25 functions.

A plurality of permanent magnets 25 are arranged on the outer peripheral surface of the output shaft 23 along the circumferential direction. In addition, the permanent magnet 25 is arranged to face the laminated iron core 15 of the stator 13 with the magnetic gap 2 in the radial direction.

In addition, in the above-mentioned structure, in this example, the above-mentioned output shaft 23 and the above-mentioned rotation-side auxiliary member 24 in the rotor 21 constitute a bearing fixing mechanism that clamps and fixes the bearings 14, 14 from one side in the axial direction and the other side in the axial direction. department. Furthermore, when manufacturing the rotating electric machine 1 , for example, the rotor 21 including the above-mentioned bearing fixing portion constituted by the output shaft 23 and the rotation side auxiliary member 24 is assembled so as to sandwich the two bearings 14 , 14 . Then, the case 11 incorporating the stator 13 is assembled to the base portion 12 . Furthermore, finally, a rotating cover 22 and a rotating disk 28 (described later) are attached to one axial side (upper side in FIG. 1 ) of the rotor 21 .

<Outline of rotation motion>

In the above configuration, an alternating magnetic field is generated inside the casing 11 by supplying electric power to the plurality of armature coils 16 of the stator 13 . Furthermore, when the permanent magnet 25 of the rotor 21 receives attractive force and repulsive force by these alternating magnetic fields, torque is generated in the output shaft 23, and the rotating part 20 rotates as a whole.

<Rotating cover and rotating disk>

A rotary cover 22 is coupled to the rotor 21 so as to cover an end portion of the stator 13 on one axial side (upper side in FIG. 1 ). As shown in FIG. 2, FIG. 3 and the above-mentioned FIG. 1, the rotating cover 22 is a circular plate member generally in the shape of a donut (annular shape), and between the rotating cover 22 and the housing 11 (or the stator 13) Between, an inner space 4 is formed. The rotary cover 22 is attached to the flange portion 23a of the output shaft 23 with, for example, bolts (not shown). Accordingly, the rotary cover 22 is disposed so as to cover the opening end of the casing 11 on the aforementioned axial side (upper side in FIGS. 1 and 3 ). Furthermore, a gap 3 is provided between the bottom surface of the rotary cover 22 on the other axial side (the lower side in FIGS. 1 and 3 ) and the armature coil 16 of the stator 13 .

The rotary cover 22 includes a flat plate portion 22b extending in a radial direction (left-right direction in FIGS. 1 and 3 ) perpendicular to the axial direction, and a cylindrical portion 22c integrally formed on the outer periphery of the flat plate portion 22b. An opening 22a is formed in the radial center portion of the flat plate portion 22b, and the opening 22a is for protruding from the end portion of the output shaft 23 on one side in the axial direction. Further, the flat plate portion 22b is formed with bolt holes 22d (not shown in FIG. 2 ; refer to FIG. 5 described later) for attaching the flat plate portion 22b to the output shaft 23 with bolts not shown. The flange portion 23a. The cylindrical portion 22c extends in the axial direction from the flat plate portion 22b so as to cover the radially outer side of the casing 11 . Furthermore, a predetermined dustproof passage 100 communicating with the radially outer peripheral portion of the internal space 4 is formed between the cylindrical portion 22 c and the case 11 (or the stator 13 ).

At this time, an annular boss 27 is attached to the flange portion 23a, and the annular boss 27 is separated from the above-mentioned rotary cover 22 in the axial direction. The annular boss 27 is formed with bolt holes 27 a for attaching the annular boss 27 to the flange portion 23 a with unillustrated bolts (see FIG. 2 ). Further, a rotary disk 28 (corresponding to a disk to be detected or a member to be detected) is supported by the flange portion 23 a of the output shaft 23 via the annular boss 27 . Accordingly, the rotary disk 28 rotates together with the rotation of the rotary cover 22 or the rotor 21 .

That is, the rotating disk 28 extends radially in the inner space 4 on the other axial side of the rotating cover 22 (or faces the inner space 4 ), and is provided radially outside of the rotor 21 . Further, an encoder pattern slit (encoder pattern slit) 28a (refer to FIG. 2 ) formed on the entire circumference along the rotation direction is provided on the back surface of the rotary disk 28 . In addition, in this example, the encoding pattern slot 28a is formed as a recessed slot that does not penetrate through. In addition, the outer diameter of the rotating disk 28 is formed to be substantially the same size as the outer diameter of the flat plate portion 22b.

At this time, as shown in FIG. 3 , the detection unit 18 is disposed at the other (upper side in FIG. 1 ) opening end of the housing 11 so as to face the rotary disk 28 . In this example, the detection unit 18 is an optical position detection sensor composed of a light emitting element and a light receiving element that optically detects the position of the rotating disk 28 . The position in the rotational direction of the rotor 21 can be detected by optically detecting the rotating disk 28 by the detecting unit 18 . The detection unit 18 is supported by the housing 11 (or the stator 13 ) via an arm-shaped (or plate-shaped) support member 17 . In other words, the detection unit 18 and the rotary disk 28 are respectively provided on the support member 17 and the output shaft 23 so as to face the internal space 4 .

As described above, in the rotating electric machine 1 according to the present embodiment, the stator 13 and the rotor 21 are arranged to face each other, and the rotating cover 22 for dustproofing is provided in connection with the rotor 21 . An internal space 4 is formed between the rotary cover 22 and the stator 13 (or the housing 11 ). Furthermore, a rotary disk 28 is provided on the radially outer side of the rotor 21 . The position in the rotational direction of the rotor can be detected by optically detecting the rotating disk 28 by the detecting unit 18 .

At this time, since the rotary cover 22 is provided to cover the axial end of the stator 13 , the outer diameter of the rotary cover 22 can be relatively large without being restricted by the stator 13 . As a result, the internal space 4 in the rotary cover 22 can be formed to have a relatively large size in the radial direction. Therefore, the outer diameter of the rotary disk 28 arranged to extend in the radial direction in the internal space 4 can be formed to be relatively large. Accordingly, since the number of slots of the code pattern slots 28 a provided in the large-diameter rotary disk 28 can be increased, high resolution can be easily ensured. As a result, the rotational position of the rotor 21 can be detected with high precision. In addition, at this time, the detection unit 18 can detect the rotating disk 28 in the internal space 4 of the rotating cover 22 without being exposed to the surrounding environment, so the detection accuracy will not be reduced due to the adhesion of dust or dust. Thus, according to the present embodiment, the position in the rotational direction of the rotor 21 can be detected with high precision by preventing adhesion of dust or dust and ensuring high resolution.

In addition, in this embodiment, in particular, the rotary cover 22 is constituted by the flat plate portion 22b and the cylindrical portion 22c, whereby the flat plate portion 22b and the rotating disk 28 are formed substantially in parallel (see FIG. 3 ). As a result, the outer diameter of the rotary disk 28 is formed to have substantially the same large diameter as the flat plate portion 22b, and high resolution can be reliably obtained as described above. Furthermore, by forming dustproof passage 100 between cylindrical portion 22 c and stator 13 (or housing 11 ) so as to communicate with the outer peripheral portion of internal space 4 , dustproofing of internal space 4 can be achieved more reliably.

In addition, in the present embodiment, the rotating disk 28 and the rotating cover 22 are attached in the last process during the manufacture of the rotating electric machine 1 as described above. Thus, even when positioning and various adjustments of the rotary disk 28 are required for the initial setting of the detection of the detection part 18 and the reset after the start of use, the rotary disk 28 and the rotary cover 22 are not removed. The base part 12, bearing 14, bearing fixing part (the combination of the output shaft 23 and the rotating side auxiliary part 24), the rotor 21, the housing 11, etc., which have been assembled before the installation process, can be easily positioned and various Adjustment.

In addition, in this embodiment, the rotation side auxiliary member 24 fixes the one bearing 14 from one side in the axial direction, and the output shaft 23 fixes the other bearing 14 from the other axial side. Furthermore, these output shafts 23 and the rotation-side auxiliary member 24 are connected to each other to constitute the above-mentioned bearing fixing portion of the rotor 21 . Thereby, the rotor 21 can realize the structure rotatably supported with respect to the base part 12 via the said two bearings 14 and 14 easily and reliably.

In addition, the disclosed embodiment is not limited to the above configuration, and various modifications can be made without departing from the gist and technical idea. Hereinafter, such modified examples will be described.

<In the case of detection using the magnetic encoder method>

It is also possible to perform magnetic detection instead of the optical detection of the coding pattern slot 28a in the above-mentioned embodiment. Such a modified example will be described with reference to FIGS. 4 to 6 . In addition, the same code|symbol is attached|subjected to the part equivalent to the said embodiment, and description is abbreviate|omitted or simplified suitably.

As shown in FIG. 4 and FIG. 6 corresponding to the above-mentioned FIG. 1 and FIG. 3 , in this modified example, the annular boss 27 and the rotating disk 28 in the above-mentioned embodiment are omitted. In addition, a plurality of (14 in this example) magnetized portions 38S, 38N (corresponding to magnets and detected members) are provided in the cylindrical portion 22c of the rotary cover 22 so as to face the internal space 4 , The plurality of magnetized portions 38S, 38N are respectively provided at a plurality of positions along the circumferential direction. The magnetized portion 38S is a region magnetized in advance so that the radially inner side becomes the S pole and the radially outer side becomes the N pole. The magnetized portion 38N is a region magnetized in advance such that the radially inner side has an N pole and the radially outer side has an S pole. These magnetized portions 38S and 38N are alternately arranged in the circumferential direction (see FIG. 5 ).

In addition, the detecting unit 18 is a Hall sensor provided at one place in the circumferential direction of the housing 11 (or the stator 13 ), and the Hall sensor is provided so as to be able to face the above-mentioned magnetized parts 38S and 38N in the internal space 4 . place. In this example, the detection part 18 is provided in the case 11 (or the stator 13 ) so as to face the magnetized parts 38S and 38N toward the radially outer side. The detection unit 18 can detect the position in the rotational direction of the rotor 21 by magnetically detecting the magnetized portions 38S and 38N.

Also in this embodiment, the same effects as those of the above-described embodiment can be obtained. That is, since the outer diameter of the rotary cover 22 can be formed relatively large without being restricted by the stator 13 , the number of magnetized parts 38S and 38N to be arranged can be increased (14 in the above example). . Accordingly, high resolution can be easily ensured, and thus the position in the rotational direction of the rotor 21 can be detected with high precision. In addition, at this time, the detection unit 18 can detect the magnetized parts 38S and 38N in the internal space 4 of the rotary cover 22 without being exposed to the surrounding environment, so the detection accuracy will not be lowered by dust or dust adhesion. Thus, according to the present embodiment, the position in the rotational direction of the rotor 21 can be detected with high precision by preventing adhesion of dust or dust and ensuring high resolution.

In addition, although the example in which the rotating electric machine 1 is an electric motor was demonstrated above, it can apply to the case where it is a generator instead of an electric motor.

In addition to what has been described above, it is also possible to appropriately combine the methods of the above-described embodiment and modifications.

In addition, although not exemplifying one by one, the above-described embodiments and modifications can be implemented by adding various changes without departing from the gist thereof.

Claims (7)

1. an electric rotating machine, is characterized in that, described electric rotating machine has:

Stator;

Rotor, it is the radially inner side at described stator across magnetic gap arranged opposite;

Cover, it links with described rotor and covers the end of an axial side of described stator, at described cover and described stator or fix the inner space that between the fixed part of this stator, formation specifies;

Detected parts, it is located in described inner space in the mode of rotating together along with the rotation of described cover or is arranged in the face of described inner space; And

Test section, it is located at described stator or described fixed part, and optical detection or magnetic detection are carried out in the position of described detected parts.

2. electric rotating machine according to claim 1, is characterized in that,

Described detected parts are detected dishes that the mode radially to extend in the described inner space of the axial opposite side of described cover is located at the radial outside of described rotor,

Described test section is located at described stator or described fixed part in the mode in the face of described inner space, and optical detection is carried out in the position of described detected dish.

3. electric rotating machine according to claim 2, is characterized in that,

Described cover possesses:

Flat part, it radially extends setting; With

Cylindrical portion, its with cover described stator side radial outside mode from described flat part along described in extend axially setting, and, between described cylindrical portion and described stator or described fixed part, be formed with the dustproof path of the regulation being communicated with the outer radial periphery portion of described inner space

Described detected dish possesses the outside dimension equating with the external diameter of described flat part.

4. electric rotating machine according to claim 1, is characterized in that,

Described detected parts are the multiple magnets along circumferential multiple positions to be separately positioned on described cover in the face of the mode of described inner space,

Described test section to be can be located at described stator or described fixed part with the opposed mode of described magnet in described inner space, and magnetic detection is carried out in the position of described magnet.

5. electric rotating machine according to claim 4, is characterized in that,

Described cover possesses:

Flat part, it radially extends setting; With

Cylindrical portion, its with cover described stator side radial outside mode from described flat part along described in extend axially setting, and, between described cylindrical portion and described stator or described fixed part, be formed with the dustproof path of the regulation being communicated with the outer radial periphery portion of described inner space

Described multiple magnet is located at the position of the inner circumferential side of described cylindrical portion,

Described test section is to be located at described stator or described fixed part towards radial outside and the opposed mode of described magnet.

6. according to the electric rotating machine described in any one in claim 1 to 5, it is characterized in that,

Described electric rotating machine also has:

Bearing, its by described rotor bearing for rotating; With

Basic courses department, it fixes bearing described at least one,

Described rotor possesses the bearing fixed part of clamping and fix described at least one bearing from a described axial side and axial opposite side.

7. electric rotating machine according to claim 6, is characterized in that,

Described basic courses department is fixed with respectively the 1st bearing of a described axial side and the 2nd bearing of described axial opposite side,

Described bearing fixed part possesses:

The 1st parts, it is from fixing described the 1st bearing of a described axial side; With

With the 2nd parts that described the 1st parts link, it is from fixing described the 2nd bearing of described axial opposite side, and possesses and the opposed permanent magnet of radially inner side of described stator at radial outside.