JP2002305847A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a manufacturing process, improve reliability, and reduce the number of parts. SOLUTION: A motor 11 is provided with a rotating shaft 20, a yoke member 28 fixed on the rotating shaft 20, and a rotor 19 including a permanent magnet 29 fixed on the outer periphery 32 of the yoke member 28. The yoke member 28 is formed by laminating a plurality of sheet bodies 30, the outer periphery 32 of which is provided with an engagement recessed section 33 engaging with the axial and peripheral directions of the permanent magnet 29 and the rotating shaft 20. The permanent magnet 29 is provided with an engagement protruding section 35, which engages with the engagement recessed section 33 of the yoke member 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, especially a motor having a novel structure for a rotor.

[0002]

FIG. 4 is a cross-sectional view of a rotor 51 of a first typical prior art motor. Hereinafter, referring to FIG.
The configuration of the rotor 51 will be described. The rotor 51 has a back yoke 53 made of a synthetic resin as an example in which the rotating shaft 52 is fixed in a caulking step or a press-fitting step. A cylindrical permanent magnet 54 is provided around the back yoke 53 with an adhesive. It is fixed at.

[0003] With respect to the motor using the rotor 51 having such a configuration, the back yoke 5 has a simple configuration.
Since the permanent magnet 3 and the permanent magnet 54 are fixed to each other with an adhesive, the process of performing this bonding is complicated, and there is a problem that quality control becomes complicated. Furthermore, since an adhesive is used, there is a problem that reliability regarding durability and the like is low.

FIG. 5 shows a rotor 5 of a second prior art motor.
5 is a sectional view of FIG. Hereinafter, referring to FIG.
Will be described. The rotor 55 is prepared by, for example, preparing a permanent magnet 56 in which the back yoke 53 and the permanent magnet 54 of the rotor 51 of FIG. 4 are integrated, and integrally molding the permanent magnet 56 and the rotating shaft 57. Is done.

[0005] Such a motor using the conventional rotor 55 does not require a back yoke as a separate component from the permanent magnet 56, and has a configuration in which the permanent magnet 56 and the rotating shaft 57 are integrally formed. Although there is an advantage of simplicity, since the permanent magnet 56 having the shape also serving as the back yoke is used, it is necessary to use the permanent magnet material to a portion that does not contribute to the generation of the rotational torque of the rotor 55, There is a problem that the usage increases.

Further, since the permanent magnet 56 and the rotary shaft 57 are integrally formed, when the shape of the rotary shaft 57 is changed,
It is necessary to change the mold for forming the permanent magnet 56, and there is a problem that a manufacturing process including a specification change at an intermediate stage of manufacturing becomes complicated. Further, since a permanent magnet 56 having a shape corresponding to the rotation shaft 57 having one shape is required,
There is a problem that it is difficult to standardize and standardize the permanent magnet 56 as a motor component, and the number of components increases.

[0007]

As described above, any of the prior arts has a problem that the manufacturing process is complicated, reliability concerning durability and the like is reduced, and the number of parts is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide a motor whose manufacturing process is simplified, reliability is improved, and the number of parts can be reduced. That is.

[0009]

According to a first aspect of the present invention, there is provided a motor comprising: a rotating shaft; a yoke member fixed to the rotating shaft;
A motor including a rotor including a magnetic force generating member fixed to an outer periphery of a yoke member, wherein the yoke member is formed by stacking a plurality of plate-like bodies, and the outer periphery of the magnetic force generating member and an axis of a rotation shaft. The magnetic force generating member has a second engaging portion that engages with the first engaging portion of the yoke member on an inner periphery thereof.

The motor according to the second aspect of the present invention provides the motor according to the first aspect.
In the invention, the first engaging portion is configured to include an engaging concave portion formed on the outer periphery of the yoke member, and the second engaging portion is formed on the inner peripheral surface of the magnetic force generating member. This is a case where it is configured to include a fitting projection to be fitted.

The motor according to the third aspect of the present invention is the second aspect of the present invention.
In the invention, the engagement recess is formed partially in the circumferential direction of the outer periphery of the yoke member, and the engagement protrusion is formed partially in the circumferential direction of the inner periphery of the magnetic force generating member. .

[0012]

According to the first aspect of the present invention, the rotor of the motor has a configuration in which a magnetic force generating member is fixed to an outer periphery of a yoke member fixed to a rotation shaft, and the yoke member includes a plurality of plate-like members. It is configured by lamination. At this time, the first engaging portion and the second engaging portion provided on the outer periphery of the yoke member and the inner periphery of the magnetic force generating member respectively correspond to the yoke member and the magnetic force generating member. Are engaged with each other in the directions and are fixed to each other.

Therefore, the necessity of fixing the yoke member and the magnetic force generating member to each other using an adhesive is eliminated, and the bonding process involving complicated quality control is eliminated, so that the manufacturing process is simplified, and furthermore, Since the bonded portion is eliminated, reliability regarding durability and the like can be remarkably improved.

Further, since the motor is configured by using the rotating shaft, the yoke member, and the magnetic force generating member as separate components, compared with the case of using a magnetic force generating member that also serves as a yoke member,
The necessity of using the permanent magnet material in a portion that does not contribute to the generation of the rotation torque of the rotor is eliminated, and the amount of the permanent magnet material used can be reduced.

Further, since the magnetic force generating member, the yoke member and the rotary shaft are separate components, even when the shape of the rotary shaft needs to be changed, the planar shape of the plurality of plate-like members constituting the yoke member can be improved. Can be dealt with. Thus, it is not necessary to change the mold for forming the magnetic force generating member. Therefore, a manufacturing process including a specification change at an intermediate stage of the manufacturing is simplified. Further, since it is sufficient to prepare a single-shaped magnetic force generating member for rotating shafts having mutually different shapes, it is possible to realize commonization and standardization of the magnetic force generating member as a motor component, and in this respect, The number of parts can be reduced.

According to the second aspect of the present invention, in the first aspect of the present invention, the first engaging portion includes an engaging recess formed on the outer periphery of the yoke member, and the second engaging portion includes , Formed on the inner periphery of the magnetic force generating member and including an engagement protrusion that fits into the engagement recess. Obviously, even when the first engaging portion and the second engaging portion have such a shape, the same operation as that described in relation to claim 1 is realized. An effect similar to the effect can be realized. According to such a configuration, at least positioning along the axial direction of the rotating shaft and prevention of movement can be realized. Thereby, the operational quality of the motor can be remarkably improved.

According to a third aspect of the present invention, in the second aspect of the present invention, the engaging recess is formed partially in a circumferential direction of an outer periphery of the yoke member, and the engaging projection is provided on the magnetic force generating member. This is a case where it is formed partially in the circumferential direction of the inner circumference. According to such a configuration, in addition to positioning and movement prevention along the axial direction of the rotation shaft, positioning and movement prevention along the circumferential direction of the rotation shaft can be realized. Thereby, the operational quality of the motor can be remarkably improved.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a motor 11 according to an embodiment of the present invention.
FIG. 2 is a sectional view taken from the front of FIG.
FIG. 3 is a cross-sectional view as viewed from 2-X2, and FIG. 3 is a cross-sectional view of the motor 11.

The configuration of the motor 11 will be briefly described below with reference to FIG. In the motor 11, a stator 15 is formed by winding a stator coil 13 around a stator core (hereinafter, core) 12. The stator coil 13 is configured by arranging a number of coils corresponding to the number of poles of the stator 15 set in the motor 11 in a circumferential direction, and connecting the coils in a predetermined connection manner. The stator 15 is molded with, for example, an electrically insulating synthetic resin material to form the frame 14.

A bearing housing 16 formed integrally with the frame 14 is disposed on one axial side of the stator 15. A bearing 17 is fitted into the bearing housing 16 and included in the rotor 19. The metal rotating shaft 20 is rotatably supported. In addition, bearing 1
A bearing 18 is arranged on the side opposite to the axial direction with respect to 7, and rotatably supports the rotating shaft 20. On the other side of the bearing housing 16 of the frame 14, a bracket 21 is attached to the frame 14 by screws 22.

A wiring board 24 is embedded in the frame 14, and the connection of the stator coil 13, the attachment of an integrated circuit element 25 described later, and the attachment of a lead wire 27 drawn through a pushing 26 are performed. . Rotary axis 2
Numeral 0 is attached to a yoke member 28 having a configuration to be described later in a caulking step or a press-fitting step, and a substantially cylindrical permanent magnet 29 as a magnetic force generating member is attached to the outer periphery of the yoke member 28 as described later. . The rotor 19 includes the rotating shaft 20, the yoke member 28 and the permanent magnet 29.

Hereinafter, the configuration of the rotor 19 will be described in detail with reference to FIGS.

In this embodiment, the yoke member 28 is formed by laminating a plurality of substantially disc-shaped plate-like bodies 30.

The plate-like body 30 has a plurality of substantially disk-like plate-like bodies 30a having a relatively large outer diameter D1 as shown in FIGS. 1 and 2, and an outer periphery of the plate-like body 30a. , Notches 31 at four equally spaced locations in the circumferential direction
Are formed, and, as an example, a plurality of plate-like members 30c having a shape similar to or the same as the plate-like member 30a are stacked in this order. Therefore, the outer peripheral surface 32 of the yoke member 28
The four engagement recesses 33 are formed in the vicinity of the intermediate position in the axial direction and at equal intervals in the circumferential direction.

On the other hand, the inner peripheral surface 34 of the permanent magnet 29 is formed in a shape corresponding to the shape of the outer peripheral surface 32 having the engaging recess 33 of the yoke member 28. That is, in this embodiment, the engagement protrusions 35 are formed at four positions corresponding to the engagement recesses 33 on the inner peripheral surface 34.

As an example, the rotor 19 having the above-described configuration is configured such that a permanent magnet 29 is formed on an intermediate product obtained by laminating a plurality of plate members 30a and then laminating a plurality of plate members 30b.
The engagement projection 35 is mounted so as to fit into the engagement recess 33 having one end opened in the axial direction. Thereafter, an intermediate product in which the yoke member 28 and the permanent magnet 289 are engaged with each other is obtained by further laminating the plate-like bodies 30c. The rotating shaft 20 is inserted into the intermediate product in a caulking step or a press-fitting step and fixed. Thus, the rotor 19 of the present embodiment is configured.

In the rotor 19 of this embodiment, since the yoke member 28 and the permanent magnet 29 are engaged with each other as described above, the yoke member 28 and the permanent magnet 29 Mutual movement is prevented in both the direction and the circumferential direction.

As described above, the motor 11 of this embodiment is
A permanent magnet 29 is fixed to the outer periphery of a yoke member 28 fixed to the rotating shaft 20 by a mechanical fixing method not depending on an adhesive, and the yoke member 28 includes a plurality of plate-like members 30. Are laminated.

Accordingly, the necessity of fixing the yoke member 28 and the permanent magnet 29 to each other using an adhesive is eliminated, and the bonding process involving complicated quality control is eliminated, so that the manufacturing process is simplified, and furthermore, In addition, since the portion to be bonded by the adhesive is eliminated, reliability regarding durability and the like can be remarkably improved.

Further, since the motor 11 is configured by using the rotating shaft 20, the yoke member 20, and the permanent magnet 29 as separate components, the motor 19 is compared with a case where a permanent magnet having a shape also serving as the yoke member 28 is used. The need to use permanent magnet material in places that do not contribute to the generation of rotational torque is eliminated,
The amount of permanent magnet material used can be reduced.

Further, since the permanent magnet 29 and the yoke member 28 and the rotary shaft 20 are separate parts, even if the shape of the rotary shaft 20 needs to be changed, a plurality of plate-like members constituting the yoke member 28 can be used. This can be dealt with by changing the planar shape of the body 30. Thereby, it is not necessary to change the mold for forming the permanent magnet 29. Therefore, the entire manufacturing process including a specification change at an intermediate stage of the manufacturing is simplified. Further, since a single permanent magnet 29 may be prepared for the rotating shafts 20 having different shapes, the permanent magnet 29 can be shared and standardized as a motor component, and this point can be realized. Thus, the number of parts can be reduced.

In the rotor 19 of the present embodiment, the yoke member 28 and the permanent magnet 29 are formed by the engagement recess 33 of the outer peripheral surface 32 of the yoke member 28 and the engagement protrusion of the inner peripheral surface 34 of the permanent magnet 29. As described above, the yoke member 28 and the permanent magnet 29 are fixed to each other by engaging with each other as described above, so that the yoke member 28 and the permanent magnet 29 , Mutual movement is prevented.
According to such a configuration, positioning along the axial direction of the rotating shaft 20 and movement preventing action are realized, and the rotating shaft 2
Positioning along the circumferential direction of 0 and movement prevention action can be realized. As a result, the operational quality of the motor 11 can be significantly improved.

The present invention is not limited to the above embodiment, but includes a wide variety of modifications without departing from the spirit of the present invention. As an example, the motor of the present invention is not limited to the motor 11 in the embodiment, but can be implemented in a wide variety of types such as a DC motor, an AC motor, and a pulse motor.

[0034]

As described above, the motor according to the first aspect of the present invention has a configuration in which the magnetic force generating member is fixed to the outer periphery of the yoke member fixed to the rotating shaft. , A plurality of plate-like bodies are laminated. At this time, the first engaging portion and the second engaging portion provided on the outer periphery of the yoke member and the inner periphery of the magnetic force generating member respectively correspond to the yoke member and the magnetic force generating member. Are engaged with each other in the directions and are fixed to each other.

Therefore, the necessity of fixing the yoke member and the magnetic force generating member to each other using an adhesive is eliminated, and the bonding process involving complicated quality control is eliminated, so that the manufacturing process is simplified, and furthermore, Since the bonded portion is eliminated, reliability regarding durability and the like can be remarkably improved.

Further, since the motor is configured by using the rotating shaft, the yoke member, and the magnetic force generating member as separate components, compared with the case of using a magnetic force generating member that also serves as a yoke member,
The necessity of using the permanent magnet material to a portion that does not contribute to the generation of the rotation torque of the rotor is eliminated, and the amount of the permanent magnet material used can be reduced.

Further, since the magnetic force generating member, the yoke member, and the rotary shaft are separate components, even when the shape of the rotary shaft needs to be changed, the planar shape of the plurality of plate-like members constituting the yoke member can be improved. Can be dealt with. Thus, it is not necessary to change the mold for forming the magnetic force generating member. Therefore, a manufacturing process including a specification change at an intermediate stage of the manufacturing is simplified. Further, since it is sufficient to prepare a single-shaped magnetic force generating member for rotating shafts having mutually different shapes, it is possible to realize commonization and standardization of the magnetic force generating member as a motor component, and in this respect, The number of parts can be reduced.

According to the second aspect of the present invention, in the first aspect of the present invention, the first engaging portion includes an engaging concave portion formed on the outer periphery of the yoke member, and the second engaging portion includes , Formed on the inner periphery of the magnetic force generating member and including an engagement protrusion that fits into the engagement recess. Obviously, even when the first engagement portion and the second engagement portion have such a shape, the same operation as that described in relation to claim 1 is realized. An effect similar to the effect can be realized. According to such a configuration, at least positioning along the axial direction of the rotating shaft and prevention of movement can be realized. Thereby, the operational quality of the motor can be remarkably improved.

According to a third aspect of the present invention, in the second aspect of the present invention, the engaging recess is formed partially in the circumferential direction of the outer periphery of the yoke member, and the engaging projection is formed of the magnetic force generating member. This is a case where it is formed partially in the circumferential direction of the inner circumference. According to such a configuration, in addition to positioning and movement prevention along the axial direction of the rotation shaft, positioning and movement prevention along the circumferential direction of the rotation shaft can be realized. Thereby, the operational quality of the motor can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a motor 11 according to an embodiment of the present invention as viewed from the front.

FIG. 2 is a cross-sectional view taken along a section line X2-X2 in FIG.

FIG. 3 is a sectional view of the motor 11;

FIG. 4 illustrates a rotor 51 of a first exemplary prior art motor.
FIG.

FIG. 5 is a sectional view of a rotor 55 of a second prior art motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Motor 15 Stator 19 Rotor 20 Rotating shaft 28 Yoke member 29 Permanent magnet 30, 30a, 30b, 30c Plate 32 Outer peripheral surface of yoke member 28 Engagement recess 34 Inner peripheral surface of permanent magnet 29 35 Engagement protrusion Department

Continued on the front page F term (reference) 5H002 AA06 AA07 AA08 AB08 AC00 AE08 5H019 AA00 AA06 AA09 AA10 CC03 CC09 EE01 EE14 GG01 5H621 BB07 GA01 HH01 JK07 JK14 5H622 CA01 CA07 CA10 CB04 PP03 PP10

Claims (3)

[Claims] 1. A motor comprising a rotor including a rotating shaft, a yoke member fixed to the rotating shaft, and a magnetic force generating member fixed to an outer periphery of the yoke member, wherein the yoke member includes a plurality of yoke members. The magnetic force generating member has a first engaging portion that engages in the axial direction and the circumferential direction of the rotating shaft on an outer periphery thereof, and the magnetic force generating member has an inner periphery thereof. The first of the yoke members
A motor having a second engaging portion that engages with an engaging portion. 2. The first engagement portion includes an engagement recess formed on an outer periphery of the yoke member, and the second engagement portion is formed on an inner periphery of the magnetic force generating member. The motor according to claim 1, further comprising an engagement protrusion fitted to the engagement recess. 3. The engaging recess is formed partially in the circumferential direction of the outer periphery of the yoke member, and the engaging projection is formed partially in the circumferential direction of the inner periphery of the magnetic force generating member. The motor according to claim 2, wherein: