JP2006158014A - Rotating machine and resolver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating machine and a resolver which enable a user to smoothly do the assembly work of a rotor and a stator, and prevent the rotation stoppage due to the bite of foreign matter. <P>SOLUTION: Since the outer flank of a resolver 30R constitutes a smooth cylindrical face, covered with a side cover 34, the resolver rotor 30R and the ruggedness equipped in the resolver stator 30S cease to catch on each other. Hereby, the assembly work is done smoothly, and the rotation stoppage of the rotor due to the bite is prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating machine and a resolver, and more particularly, to a reluctance type rotating machine and a resolver having a plurality of salient poles on an outer surface of a rotor.

Teeth, magnets, salient poles, and the like are provided on the outer side surface of the rotor and the inner side surface of the stator provided in the rotating machine and resolver, and have a shape in which irregularities are repeated. As an example, a reluctance resolver 2 provided at one end of the motor 1 is shown in FIGS. The rotor 2R of the resolver 2 is integrally formed at one end of the rotor 1R of the motor 1 (see FIG. 12). Further, as shown in FIG. 13, when the rotor 2R of the resolver 2 is viewed from the axial direction, it is substantially triangular (so-called rice ball shape), and three corners of the substantially triangular shape are salient poles 2P. . On the other hand, the stator 2S of the resolver 2 includes a plurality of teeth 2T, and a coil 2C is wound around each of the teeth 2T. And according to the change of the inductance of each coil 2C, the rotation position of the rotor 2R can be detected (for example, refer patent document 1).
JP 2003-114139 A (paragraphs [0012] and [0013], FIGS. 2 and 4)

  By the way, in the conventional rotating machine and resolver, when the rotor and the stator are inserted and assembled, a plurality of irregularities provided on the respective side surfaces of the rotor and the stator are caught with each other, and it is difficult to perform the work smoothly. In the reluctance type resolver 2 described above, since a relatively large space 3 is formed between the adjacent salient poles 2P, 2P, a foreign substance (see reference numeral 4 in FIG. 13) enters the space. In some cases, the assembling work ends. Then, during the shipping test, there could occur a situation in which the resolver 2 becomes incapable of rotating due to a foreign object. Furthermore, even when the assembly work is completed without foreign matter entering, some of the built-in components may fall off during use of the motor 1 and resolver 2 and become foreign matter. There is also a concern that the 1 and the resolver 2 may not rotate.

  The present invention has been made in view of the above circumstances, and provides a rotating machine and a resolver that can smoothly perform assembly work of a rotor and a stator and can prevent rotation from being stopped due to the biting of foreign matter. Objective.

  In order to achieve the above object, a rotating machine according to the invention of claim 1 is provided with a plurality of irregularities and at least one of an outer side surface of a rotor and an inner side surface of a stator that are adjacent to each other and nonmagnetic. A cylindrical side cover formed of a body is fitted and fixed, and a smooth cylindrical surface is formed on the side of the side cover opposite to the side fixed and fixed.

  The invention of claim 2 is characterized in that, in the rotating machine according to claim 1, the side cover is fitted and fixed only to the inner side surface of the stator.

  The invention of claim 3 is a reluctance type rotating machine having a plurality of salient poles on the outer surface of the rotor, wherein the side cover is fitted and fixed to the outer surface of the rotor. It has the characteristics where it was done.

  The invention according to claim 4 is characterized in that, in the rotating machine according to claim 3, a plurality of protrusions are formed to protrude from the side cover to adjacent salient poles of the rotor.

  A resolver according to a fifth aspect of the present invention is a cylindrical side cover formed of a nonmagnetic material on at least one of an outer side surface of a rotor and an inner side surface of a stator, each of which has a plurality of irregularities and passes adjacent to each other. Is fitted and fixed, and has a feature in that a smooth cylindrical surface is formed on the opposite side of the side cover of the side cover.

  The invention of claim 6 is characterized in that, in the resolver according to claim 5, the side cover is fitted and fixed only to the inner side surface of the stator.

  The invention of claim 7 is the resolver according to claim 5, wherein the resolver is a reluctance type resolver having a plurality of salient poles on the outer surface of the rotor, and a side cover is fitted and fixed to the outer surface of the rotor. However, it has characteristics.

  The invention of claim 8 is characterized in that, in the resolver according to claim 7, a plurality of protrusions are formed to project from the side cover to adjacent salient poles of the rotor.

  A rotating machine according to a ninth aspect of the invention is characterized in that the resolver according to any one of the fifth to eighth aspects is provided at one end in the axial direction, and the rotor of the resolver is integrally formed at one end of the rotor of the rotating machine. Have.

[Inventions of Claims 1, 5 and 9]
According to the configurations of the first, fifth, and ninth aspects, at least one of the outer surface of the rotor or the inner surface of the stator is covered with the side cover to form a smooth cylindrical surface. Thereby, the unevenness | corrugation with which the rotor and the stator were equipped is not caught mutually, the assembly operation | work of a rotor and a stator can be performed smoothly, and the rotation stop of the rotor by biting can be prevented.

[Inventions of Claims 2 and 6]
According to the second and sixth aspects of the present invention, since the side cover is fitted and fixed only to the stator that does not rotate, and the side cover is fixed to the rotor that rotates, the side cover increases the inertia of the rotor. Can be prevented.

[Inventions of Claims 3 and 7]
Generally, in a reluctance type rotating machine and resolver provided with a plurality of salient poles on the rotor side, foreign matter easily enters between adjacent salient poles, and foreign matter is likely to be caught. According to this, since the space between the salient poles adjacent to each other by the side cover is covered from the stator side, foreign matter can be prevented from being caught.

[Inventions of Claims 4 and 8]
In the rotating machine according to the fourth aspect and the resolver according to the eighth aspect, the space between the adjacent salient poles of the rotor can be closed also from the axial direction of the rotor by the protrusion provided on the side cover.

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The motor 10 of this embodiment is, for example, a brushless DC motor, and includes a stator 10S (hereinafter referred to as “motor stator 10S”) inside a cylindrical case 12, and a rotor 10R (hereinafter referred to as “hereinafter referred to as“ motor stator 10S ”) inside the motor stator 10S. The motor rotor 10 </ b> R ”) is rotatably provided. The motor stator 10 </ b> S includes a stator core 13 and a plurality of coils 15. The stator core 13 is formed, for example, by laminating a plurality of silicon steel plates, and has a structure in which a plurality of teeth 14 protrudes inward from the inner surface of the cylindrical body as shown in FIG. A coil 15 is wound around each of the teeth 14. Note that the inner surface of the motor stator 10S has a plurality of irregularities due to the teeth 14 and the slots (grooves) between the teeth 14, 14.

  The motor rotor 10 </ b> R includes a rotating cylinder 21 having a rotor shaft 22 passing through the center, and a plurality of segment magnets 23 are fixed to the outer surface of the rotating cylinder 21. The rotating cylinder 21 is formed by laminating a plurality of silicon steel plates, for example. The segment magnet 23 is a permanent magnet made of a sintered member, and has, for example, a roof structure in which a cylindrical body that can be fitted to the outside of the rotating cylindrical body 21 (see FIG. 1) is divided into a plurality of vertically divided pieces. Further, each segment magnet 23 is magnetized so that the magnetic path is directed in the radial direction of the motor rotor 10R, for example, and conversely with the segment magnet 23 having NS poles from the inner side to the outer side in the radial direction, The segment magnets 23 having NS poles from the outside in the radial direction to the inside are alternately arranged in the circumferential direction of the motor rotor 10R. And the cylindrical scattering prevention cover 24 is fitted so that the outer side of these several segment magnets 23 may be covered. The scattering prevention cover 24 is made of a nonmagnetic material such as synthetic resin, for example.

  As shown in FIG. 1, the cylindrical case 12 has a cylindrical shape with one end, and a bearing 25 is assembled in a through hole formed at the center of the bottom wall at one end. Further, the opening at the other end of the cylindrical case 12 is closed by a case lid 26. An emboss protrudes from the center of the case lid 26, and the bearing 25 is also assembled in a recess formed in the center of the emboss. In this way, the rotor shaft 22 is pivotally supported by the pair of bearings 25, 25 provided at both ends of the cylindrical case 12, so that the motor rotor 10R can rotate with respect to the motor stator 10S.

  As shown in FIG. 1, a reluctance resolver 30 is provided at one end of the motor 10 in the axial direction. The resolver 30 includes a rotor 30R (hereinafter referred to as “resolver rotor 30R”) that is rotatable inside a stator 30S (hereinafter referred to as “resolver stator 30S”). The stator core 31 provided in the resolver stator 30S is formed by laminating a plurality of silicon steel plates, for example, similarly to the stator core 13 of the motor 10, and a plurality of (for example, twelve) cores are provided inside the stator core 31 as shown in FIG. The teeth 32 are formed so as to protrude, and a coil 33 is wound around each of the teeth 32. The inner surface of the resolver stator 30S is also provided with a plurality of irregularities due to the teeth 32 and the slots (grooves) between the teeth 32, 32.

  The resolver stator 30S is fitted and assembled in the cylindrical case 12 via the adapter 16, for example. Specifically, the adapter 16 is assembled so that its outer surface is fitted to the inner surface of the cylindrical case 12 and is in contact with the end surface of the motor stator 10S. A large inner diameter portion is provided on the inner surface of the adapter 16 on the side away from the motor stator 10S, and the resolver stator 30S is fitted and fixed inside the large inner diameter portion. Thereby, the resolver stator 30S is positioned in a state slightly separated from the motor stator 10S. Further, the end face of the adapter 16 and the resolver stator 30S opposite to the motor stator 10S is in contact with the case lid 26, whereby the resolver stator 30S, the adapter 16 and the motor stator 10S are positioned in the axial direction of the cylindrical case 12. It is fixed.

  As shown in FIG. 1, the resolver rotor 30 </ b> R is fitted and fixed to the outer surface of the small diameter portion 21 </ b> B provided at one end of the rotating cylindrical body 21. As shown in FIG. 4, a plurality of (for example, seven) salient poles 35 project from the outer surface of the resolver rotor 30 </ b> R toward the outer side in the radial direction. Specifically, rounded crests and troughs are repeatedly formed at regular intervals on the outer surface of the resolver rotor 30 </ b> R, and the crests are the plurality of salient poles 35.

  A side cover 34 is fitted on the outer surface of the resolver rotor 30R. The side cover 34 has, for example, a structure in which a band plate made of a nonmagnetic material such as synthetic resin is formed into an annular shape (see FIG. 2). And it is fixing so that it may rotate integrally with the resolver rotor 30R. In detail, as shown in FIG. 1, the rotating cylinder 21 is provided with a cover fitting portion 21A adjacent to the small diameter portion 21B. For example, the cover fitting portion 21A has an outer surface at the same position as the tip of each salient pole 35 in the radial direction of the motor rotor 10R, and the side cover 34 straddles the resolver rotor 30R and the cover fitting portion 21A. Are mated. And the side surface cover 34 is hold | maintained in the state which covered the outer side of the resolver rotor 30R by being fixed to the outer surface of the cover fitting part 21A with an adhesive agent, for example.

  The configurations of the motor 10 and the resolver 30 of the present embodiment are as described above. Next, the assembly work of the motor 10 will be described. In order to assemble the motor 10, the bearing 25 is assembled at the center of one end side of the cylindrical case 12, and the motor stator 10 </ b> S is fitted inside the cylindrical case 12. On the other hand, in the motor rotor 10R, the resolver rotor 30R and the side cover 34 are assembled at one end thereof. Then, the motor rotor 10R is inserted into the motor stator 10S. At this time, even if the outer surface of the motor rotor 10R contacts the inner surface of the motor stator 10S, the outer surface of the motor rotor 10R is covered with the anti-scattering cover 24 made of synthetic resin. And the segment magnet 23 are not in direct contact with each other, and the motor rotor 10R can be smoothly inserted into the motor stator 10S. Then, the tip of the rotor shaft 22 is passed through the bearing 25, and the motor rotor 10 </ b> R is inserted to the back of the cylindrical case 12.

  In this state, for example, the adapter 16 is fitted and inserted into the cylindrical case 12, and then the resolver stator 30 </ b> S is fitted inside the adapter 16. At this time, even if the inner side surface of the resolver stator 30S comes into contact with the outer side surface of the resolver rotor 30R provided at the end of the motor rotor 10R, the outer side surface of the motor rotor 10R is covered with the side cover 34 and has a smooth cylindrical surface 34A ( 1 and 4), the salient poles 35 provided on the resolver rotor 30R and the teeth 32 of the resolver stator 30S are not caught with each other, and the assembly work can be performed smoothly. Then, the opening end of the cylindrical case 12 is closed with the case lid 26 and the end of the rotor shaft 22 is inserted into the bearing 25 provided in the case lid 26 to complete the assembling operation.

  By the way, it is conceivable that, for example, a bolt, a washer, or the like enters the motor 10 as a foreign object in the process of the assembly operation described above. In addition, some of the built-in components of the motor 10 may be lost during use of the motor 10 to become a foreign object. In the conventional reluctance resolver, like the resolver 30 of the present embodiment, there is a concern that foreign matter may enter between the adjacent salient poles 35 and 35 and the foreign matter may be caught. However, in the present embodiment, the space 36 between the salient poles 35, 35 adjacent to each other by the side cover 34 is covered from the resolver stator 30 </ b> S side, so that the foreign object can be prevented from being caught by the resolver 30.

  As described above, according to the present embodiment, since the outer surface of the resolver rotor 30R is covered with the side cover 34 to form a smooth cylindrical surface, the unevenness provided in the resolver rotor 30R and the resolver stator 30S may be caught with each other. Disappear. As a result, the assembling work can be performed smoothly and the rotation of the rotor due to biting can be prevented from stopping.

  In the present embodiment, as shown in FIG. 3, adjacent segment magnets 23 and 23 are joined to form a cylindrical shape as a whole, but a gap is provided between adjacent segment magnets 23. It may be structured. That is, a structure in which convex portions by the segment magnets 23 and concave portions between the segment magnets 23 and 23 are alternately repeated on the outer surface of the motor rotor 10R.

[Second Embodiment]
This embodiment is shown in FIG. 5, and only the configuration of the side cover 37 is different from the side cover 34 of the first embodiment. That is, the side cover 37 of the present embodiment is formed with a plurality of protrusions 38 projecting toward the space 36 between the salient poles 35, 35 of the resolver rotor 30R. Other configurations are the same as those in the first embodiment.

  According to the configuration of the present embodiment, the space 36 between the adjacent salient poles 35, 35 in the resolver rotor 30 </ b> R can be closed from the axial direction of the resolver rotor 30 </ b> R by the projection 38 provided on the side cover 37. . This prevents a foreign matter from being caught between the side cover 37 and the resolver rotor 30R, and the foreign matter is caught on the inner surface of the motor 10 (for example, the inner surface of the case lid 26 shown in FIG. 1) to stop the rotation. Can do. The protrusion 38 may be formed integrally with the side cover 37, or after the protrusion 38 is attached to the resolver rotor 30R, the resin is filled between the side cover 37 and the resolver rotor 30R and then solidified. It may be formed.

[Third Embodiment]
This embodiment is shown in FIG. 6, and has a structure in which a cylindrical plate 41 is formed so as to protrude from one end portion of the side cover 34 of the first embodiment to cover the end face of the resolver rotor 30 </ b> R. . Other structures are the same as those in the first embodiment. According to the present embodiment, the cylindrical plate 41 integrally formed with the side cover 34 allows the space 36 (see FIG. 4) between the salient poles 35 and 35 to be in the axial direction of the resolver rotor 30R as in the second embodiment. Can be blocked from.

[Fourth Embodiment]
This embodiment is shown in FIG. 7 and is different from the first embodiment only in that the side cover 39 is fitted and fixed to the resolver stator 30S side instead of the resolver rotor 30R. According to the configuration of this embodiment, the side cover 39 is fitted and fixed to the resolver stator 30S that does not rotate, and the side cover is fixed to the resolver rotor 30R that rotates. Therefore, the inertia of the resolver rotor 30R is fixed by the side cover 39. Can be prevented from increasing.

[Fifth Embodiment]
This embodiment is shown in FIG. 8 and has a configuration in which the anti-scattering cover 42 fitted and fixed to the outside of the segment magnet 23 of the motor rotor 10R is extended and fitted to the outside of the resolver rotor 30R. . That is, the structure is such that one end portion of the scattering prevention cover 42 is used as the “side cover” according to the present invention. Other structures are the same as those in the first embodiment. According to this configuration, the number of parts can be reduced as compared with the first embodiment.

[Sixth Embodiment]
FIG. 9 shows a reluctance motor 50 according to this embodiment. A plurality of (for example, eight) teeth 52 are formed on a stator core 51 provided in the motor stator 50 </ b> S of the motor 50, and a coil 53 is wound around each tooth 52. On the other hand, in the motor rotor 50R, the rotor shaft 54 passes through the center, and a plurality (for example, six) of salient poles 56 project radially from the outer surface of the motor rotor 50R. Then, a side cover 57 provided on the inside with a cylindrical surface that passes through the front end surfaces of the salient poles 56 is fitted and fixed to the outer surface of the motor rotor 50R.

  Even in the configuration of the present embodiment, the outer surface of the motor rotor 50R is covered with the side cover to form a smooth cylindrical surface, as in the first embodiment, so that the assembly work between the motor rotor 50R and the motor stator 50S is performed. This can be performed smoothly, and the rotation of the motor rotor 50R can be prevented from stopping due to the biting.

[Seventh Embodiment]
This embodiment is shown in FIG. 10 and is different from the sixth embodiment only in that the side cover 57 is fitted and fixed not to the motor rotor 50R but to the motor stator 50S side. Also according to the configuration of the present embodiment, as in the fourth embodiment, it is possible to prevent the inertia of the motor rotor 50R from increasing and to prevent the rotation from being stopped due to the biting of foreign matter.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the sixth and seventh embodiments, the motor is exemplified as the rotating machine, but the present invention may be applied to a generator.

  (2) Although the resolver 30 shown in the first to fifth embodiments is a reluctance type, the present invention is applied to a resolver having a structure in which both a resolver stator 30S and a resolver rotor 30R are provided with coils. May be.

  (3) In the first to seventh embodiments, the side cover is fitted and fixed to either the rotor or the stator, but the side cover is fitted and fixed to both the rotor and the stator. Good.

1 is a side sectional view of a motor and a resolver according to a first embodiment of the present invention. Disassembled perspective view of rotating machine and resolver Sectional drawing of the AA cut surface in FIG. Sectional drawing of the BB cut surface in FIG. Sectional drawing of the resolver of 2nd Embodiment Side sectional view of motor and resolver of third embodiment Sectional drawing of the resolver of 4th Embodiment Side sectional view of motor and resolver of fifth embodiment Sectional drawing of the reluctance type motor of 6th Embodiment Sectional drawing of the reluctance motor of the seventh embodiment Side view of a conventional resolver A perspective view of a conventional rotor Cross section of a conventional resolver

Explanation of symbols

10, 50 Motor 10R, 50R Motor rotor 10S, 50S Motor stator 23 Segment magnet 24, 42 Anti-scattering cover 30 Resolver 30R Resolver rotor 30S Resolver stator 34, 37, 39, 57 Side cover 34A Cylindrical surface 35 Salient pole 38, 56 Projection

Claims (9)

  A cylindrical side cover made of a non-magnetic material is fitted and fixed to at least one of the outer side surface of the rotor and the inner side surface of the stator that have a plurality of irregularities and pass each other adjacent to each other. A rotating machine characterized in that a smooth cylindrical surface is formed on the side opposite to the side on which the fitting is fixed.   The rotating machine according to claim 1, wherein the side cover is fitted and fixed only to an inner side surface of the stator.   The reluctance type rotating machine having a plurality of salient poles on an outer surface of the rotor, wherein the side cover is fitted and fixed to the outer surface of the rotor. .   4. The rotating machine according to claim 3, wherein a plurality of protrusions are formed so as to protrude from the side cover between the salient poles adjacent to the rotor. 5.   A cylindrical side cover made of a non-magnetic material is fitted and fixed to at least one of the outer side surface of the rotor and the inner side surface of the stator that have a plurality of irregularities and pass each other adjacent to each other. A resolver characterized in that a smooth cylindrical surface is formed on the side opposite to the side on which the fitting is fixed.   The resolver according to claim 5, wherein the side cover is fitted and fixed only to the inner side surface of the stator. The resolver according to claim 5, wherein the resolver is a reluctance resolver having a plurality of salient poles on an outer surface of the rotor, and the side cover is fitted and fixed to the outer surface of the rotor.   The resolver according to claim 7, wherein a plurality of protrusions are formed to protrude from the side cover to the salient poles adjacent to the rotor. A rotating machine comprising the resolver according to any one of claims 5 to 8 at one end in an axial direction, and a rotor of the resolver integrally formed at one end of a rotor of the rotating machine.

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