JP2002369432A - Rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assemblability of an armature core and a core cover. SOLUTION: A core cover 15a, fixed to an end surface 10a of an armature core 10, is formed out of an end wall 16 positioned at the end surface 10a of the armature core 10, and twelve fitting sections 17a to 17l which protrude in the axial direction. Positioning fitting sections B1 and B2 are formed by extending the fitting sections 17a and 17g fitted into slots S1 and S7, with the largest width in circumferential direction among the fitting sections 17a to 17l, in the axial direction being larger than those in the other fitting sections.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating machine, and is particularly effective when applied to a rotating machine having an end cover interposed between an iron core and a winding.

[0002]

2. Description of the Related Art Rotary machines are widely used from automotive parts such as wipers and alternators to consumer equipment such as OA and AV equipment.

[0003] Such a rotating machine generates DC power by receiving mechanical power, or generates DC power by receiving DC power, or a three-phase or single-phase machine that receives mechanical power. There are synchronous machines that convert AC power or convert AC power into mechanical power, and induction machines that transmit energy from one winding to another winding by electromagnetic induction. These rotating machines are structurally constituted by a stator and a rotor, and mechanically mutually convert electric energy and mechanical energy between the stator and the rotor via magnetic energy. It is an electromagnetic type electrical / mechanical converter. Therefore, at least one of the stator and the rotor is formed of an iron core around which the winding is wound.

For example, in a wiper device mounted on an automobile, a brushed DC motor, which is a kind of DC machine, is used as a driving source. A plurality of armature coils are provided in a motor housing of the brushed DC motor. Is rotatably provided.
In this case, each of the amateur coils is housed in a plurality of slots formed in the amateur core by lap winding. In addition, a permanent magnet as a stator is disposed on the inner peripheral surface of the motor housing,
A magnetic flux is supplied into the motor housing. By supplying power to these amateur coils, a rotational force is generated in the amateur.

[0005] Such an armature core is formed by laminating a large number of armature punched sheets punched into a predetermined shape in order to reduce the eddy current generated in the armature core. For this reason, the end of the slot around which the amateur coil is wound has an edge, but it is difficult to chamfer the edge. For this reason, the conductor coating of the amateur coil in contact with the end may be peeled off, and the insulation between the amateur core and the amateur coil may not be maintained.

For this reason, as disclosed in Japanese Utility Model Laid-Open No. 2-10774 and Japanese Utility Model Laid-Open No. 6-9352, a core cover formed of a resin mixed with glass fibers is provided between an amateur core and an amateur coil. Some are interposed. The core cover has an end wall portion located on the end face of the amateur core, and a fitting portion that is provided to project from the end wall portion and that is fitted into a slot, respectively.
The end wall and the insertion portion are interposed between the armature core and the armature coil, thereby protecting the armature coil and insulating the members from each other.

[0007]

In a rotating machine having such an armature, in order to accommodate each of the wound amateur coils in a slot in a well-balanced manner,
There is a so-called unequal slot core in which the shape of each slot formed in the amateur core is changed to an irregular shape by changing its circumferential width.

In this case, the core covers assembled to the amateur cores are formed in different shapes according to the shapes of the corresponding slots. Therefore, when assembling the core cover to the amateur core, the assembling can be performed only when the respective insertion portions match the slots corresponding to the insertion portions.

Therefore, when the number of slots is large, it becomes difficult to position the core cover with respect to the amateur core, and the assemblability between the core cover and the amateur core deteriorates.

An object of the present invention is to improve the assemblability of an iron core and an end cover.

[0011]

A rotating machine according to the present invention has a stator fixed to a motor housing and a rotor rotatably housed in the motor housing, wherein the stator and the rotor are arranged. And at least one of the stator and the rotor, and has at least two types having different circumferential widths. A core provided with a plurality of slots extending in the axial direction for accommodating the windings, an end wall portion in contact with an end surface of the core, and a plurality of fitting portions integrated with the end wall portion and entering the slots. An end cover, wherein in the end cover, at least one of the fitting portions is a positioning fitting portion formed to extend in the axial direction from the other fitting portion. Toss .

A rotating machine according to the present invention has a permanent magnet fixed to a motor housing and an armature rotatably housed in the motor housing, and converts electric energy into mechanical energy. Constituting the armature,
An armature core having at least two types having different circumferential widths, and each having a plurality of slots extending in the axial direction and accommodating the armature winding, an end wall portion in contact with an end face of the armature core, and An end cover having a plurality of fitting portions integrally formed with the end wall portion and entering the slot, wherein at least one of the fitting portions is more axial than the other fitting portions. It is characterized in that it is a positioning insertion portion formed to extend in the direction.

[0013] The rotary machine according to the present invention is characterized in that the positioning insertion portion is inserted into the slot having the largest circumferential width.

In the present invention, at least one of the fitting portions forming the end cover is a positioning fitting portion formed so as to extend in the axial direction from the other fitting portions. Therefore, by assembling the core and the end cover with reference to the positioning fitting portion, the end cover can be easily positioned with respect to the iron core, and the assemblability between the core and the end cover can be improved.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing a brushed DC motor according to an embodiment of the present invention, and FIG. 2 is a sectional view showing an AA section of the brushed DC motor shown in FIG.

A brushed DC motor 1 shown in FIG. 1 has permanent magnets 2 and 3 as stators and an armature or an armature 4 as a rotor, and is a rotary machine for converting electric energy into mechanical energy. This is a kind and is used to drive a wiper device mounted on a vehicle.

The motor housing 5 of the brushed DC motor 1 is formed in a bottomed cylindrical shape obtained by pressing a deep drawn steel plate with a press, and two permanent magnets 2 and 3 are formed on the inner peripheral surface 5a of each other. The magnetic poles are fixed so that different magnetic poles face each other, and supply magnetic flux to the inside of the motor housing 5. Also, the open end 5 of the motor housing 5
A front bracket 8 made of aluminum die-cast is attached to b by fastening members 6 and 7, and the opening end 5b is closed.

The armature 4 includes a shaft 9 and an armature core as an iron core, that is, an armature core 10 and a commutator 11.
The bearing 1 has a shaft 9 provided in the bottom 5c of the motor housing 5 and the through hole 8a of the front bracket 8.
2 and 13, the motor housing 5
It is rotatably housed inside.

The armature core 10 is arranged so as to be located in the magnetic flux generated by the permanent magnets 2 and 3, and is fitted to a spline portion 9 a formed on the shaft 9 to rotate integrally with the shaft 9. ing.

As shown in FIG. 2, the amateur core 10 has six types having different widths in the circumferential direction, and has twelve slots S1-S extending in the axial direction, respectively.
12 are provided. These slots S1 to S12
Are slot S1, slot S7, and slot S, respectively.
2 and slot S8, slot S3 and slot S9, slot S4 and slot S10, slot S5 and slot S
11, the slot S6 and the slot S12 have the same circumferential width, and the slots having the same width are arranged with a phase difference of 180 ° from each other. Of the slots S1 to S12, the slot having the largest circumferential width is the slot S1.
1 and slot S7. Thus, the amateur core 10 is a so-called unequal slot type amateur core. In the present embodiment, the number of slots S1 to S12 is 12, but the number is not limited to this and may be any number.

In these slots S1 to S12, winding starts from the slots S1 and S7 having the largest circumferential width, and the end of the winding is also the slot S1.
A plurality of armature coils 14 as windings, that is, armature windings, are respectively accommodated by lap winding so as to be 1 and the slot S7. Thus, the slots S1 and S2 having the largest circumferential width are formed.
7, the winding start and end portions of the armature coil 14 are positioned so that the armature coil 14 is accommodated in the slots S1 to S12 with good balance.

FIG. 3 is a perspective view showing details of an armature core and a core cover used in the brushed DC motor shown in FIG. 1, and FIG. 4 shows a comparative example of the armature core and the core cover shown in FIG. It is a perspective view.

As shown in FIG. 3, this amateur core 1
The two core covers 15a, 15b as end covers are fixed to the respective end faces 10a, 10b of the "0" between the armature core 10 and the armature coil 14, respectively. The core covers 15a and 15b are formed symmetrically with each other, and have the same configuration except that the core cover 15a is fixed to the end face 10a of the amateur core 10 and the core cover 15b is fixed to the end face 10b of the amateur core 10. Hereinafter, only the core cover 15a will be described.

The core cover 15a is used for the amateur core 10
Has an end wall portion 16 in contact with the end surface 10a of the front end portion 12a and twelve insertion portions 17a to 17l formed integrally with the end wall portion 16, and the outer shapes of these insertion portions 17a to 17l correspond to each other. The slots S1 to S12 are formed in the same shape as the corresponding slots, and are inserted into the corresponding slots.

In the amateur core 18 and the core cover 19 as comparative examples shown in FIG. 4, twelve slots R1
To R12 are formed in the same shape. Therefore, such an equal-slot type amateur core 18
The core cover 19 fixed to the
a to 20l are formed in the same shape, and the dimensions of the respective insertion portions 20a to 20l in the axial direction are also formed to be the same. Then, each of the insertion portions 20a to 20
1 can be inserted into any of the slots R1 to R12, so that the core cover 19 can be assembled to the amateur core 18 in any case, and there is no problem in the assemblability. .

However, in the case of the amateur core 10 having unequal slots as shown in FIG.
a to 17l are formed in different shapes according to the shapes of the corresponding slots.
a and the amateur core 10 can be assembled only when the fitting portions 17a to 17l correspond to the slots S1 to S12 corresponding to the fitting portions 17a to 17l. Therefore, when the number of slots is large, it is difficult to position the core cover 15a with respect to the amateur core 10, and the assemblability of the amateur core 10 and the core cover 15a deteriorates.

For this reason, in the core cover 15a of the present invention shown in FIG.
Slots S1, S formed with the largest circumferential width
The fitting insertion portions 17a and 17g to be inserted into the connector 7 are positioning fitting insertion portions B1 and B2, and the positioning fitting insertion portions B1 and B2 are formed to extend in the axial direction from the other insertion portions. That is,
The axial dimension L of the insertion sections B1 and B2 is formed longer than the axial dimension 1 of the other insertion sections. Therefore, when assembling the amateur core 10 and the core cover 15a, the distal end portions B1a, B1a,
B2a is located in the slot S1, before the tip of the other insertion portion.
It will be inserted into S7. Therefore, the amateur core 10 is positioned on the basis of the positioning insertion portions B1 and B2.
By assembling the core and the core cover 15a, the positioning between the amateur core 10 and the core cover 15a is facilitated, and the assemblability between the amateur core 10 and the core cover 15a can be improved. In the present embodiment, the number of positioning fitting insertion portions is two, but the number is not limited to this, and at least one positioning fitting insertion portion may be formed.

Further, the positioning fitting insertion portions B1 and B2 are
Slots S1, S formed with the largest circumferential width
7 so that the positioning fitting portions B1 and B2 do not inadvertently fit into other slots, so that the amateur core 10 and the core cover 15 are further inserted.
It is possible to improve the assembling property with a.

The commutator 11 has a resin body 11a fixed to the shaft 9, and twelve commutators radially arranged on the outer periphery of the body 11a, each being electrically insulated from each other. The arm 11 is positioned on the left side of the amateur core 10 in the figure and is attached to the shaft 9. And each commutator piece 1
1b are connected to the corresponding amateur coils 14, respectively.

A tip 9b of the shaft 9 projects outward from a through hole 8a provided in the front bracket 8, and the tip 9b is connected to a speed reducer (not shown) attached to the front bracket 8. The output of the brushed DC motor 1 is transmitted to a wiper arm (not shown) via a speed reducer.

A brush holder 21 formed in a cylindrical shape with a bottom is mounted inside the front bracket 8. The brush holder 21 has two brush holding portions 22.
Has been fixed. Each of the brush holding portions 22 supports a brush 24 slidably in contact with the commutator piece 11 b of the commutator 11 while being urged by the spring 23. In the present embodiment, two brush holders 22 and two brushes 24 are provided. However, the present invention is not limited to this, and any number of brush holders and brushes may be used.

The brushed DC motor 1 having such a structure
Then, when a current is supplied to each brush 24, a rectified current flows through the armature coil 14 located in the magnetic flux through the brush 24 and the commutator 11, and a rotational force is generated in the armature 4. Become.

The present invention is not limited to the above embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention. For example, in the present embodiment, the stator is the permanent magnets 2 and 3, and the rotor is the armature provided with the slots S1 to S12 for accommodating the amateur coil 14, but the present invention is not limited to this. A plurality of slots in which at least one of a stator and a rotor accommodates a winding, such as a stator provided with a magnet and an armature provided with slots S1 to S12 in which the amateur coils 14 are accommodated, are provided. What is necessary is just to be comprised by the formed iron core.

Further, in the present embodiment, the case where the present invention is applied to the brushed DC motor 1 for converting electric energy into mechanical energy is shown, but the present invention is not limited to this, and other embodiments such as a brushless motor and a synchronous motor are used. Any other type of rotating machine, such as a motor of a type or a generator that converts mechanical energy into electrical energy, that performs mutual conversion between electrical energy and mechanical energy between a stator and a rotor. Is also good.

[0036]

According to the present invention, at least one of the fitting portions forming the end cover is provided with a positioning fitting portion formed to extend in the axial direction from the other fitting portion. Therefore, by assembling the core and the end cover with reference to the positioning insertion portion, the end cover can be easily positioned with respect to the iron core, and the assemblability between the core and the end cover can be improved. .

Further, since the positioning insertion portion is inserted into the slot having the largest width in the circumferential direction, the assemblability between the iron core and the end cover can be further improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a brushed DC motor according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an AA section of the DC motor with brush shown in FIG. 1;

FIG. 3 is a perspective view showing details of an armature core and a core cover used in the brushed DC motor shown in FIG. 1;

FIG. 4 is a perspective view showing a comparative example of the amateur core and the core cover shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 DC motor with a brush 2, 3 Permanent magnet 4 Amateur 5 Motor housing 5a Inner peripheral surface 5b Open end 5c Bottom part 6, 7 Fastening member 8 Front bracket 8a Through hole 9 Shaft 9a Spline part 9b Tip end 10 Amateur core 10a, 10b End face DESCRIPTION OF SYMBOLS 11 Commutator 11a Body 11b Commutator piece 12, 13 Bearing 14 Amateur coil 15a, 15b Core cover 16 End wall part 17a-17l Insertion part 18 Amateur core 19 Core cover 20a-20l Insertion part 21 Brush holder 22 Brush holding part 23 Spring 24 Brush S1 to S12 Slot R1 to R12 Slot B1, B2 Positioning Insertion Insertion B1a, B2a Tip L, l Dimensions in the axial direction

Claims (3)

[Claims] 1. A stator fixed to a motor housing and a rotor rotatably housed in the motor housing, wherein electric energy and mechanical energy are exchanged between the stator and the rotor. A rotating machine that performs conversion, and constitutes at least one of the stator and the rotor, has at least two types having different circumferential widths, and respectively accommodates windings extending in the axial direction. An end cover having a plurality of slots provided therein, and an end wall having an end wall in contact with an end face of the iron core and a plurality of fitting portions integrated with the end wall and entering the slot. In the cover, at least one of the fitting portions is a positioning fitting portion formed to extend in the axial direction from the other fitting portions. 2. A rotating machine having a permanent magnet fixed to a motor housing and an armature rotatably housed in the motor housing, wherein the rotating machine converts electric energy into mechanical energy. An armature core having at least two types having different circumferential widths and having a plurality of slots extending in the axial direction for accommodating the armature winding; and an end contacting an end face of the armature core. An end cover having a plurality of fitting portions integrated with the wall portion and the end wall portion and entering the slot, wherein at least one of the fitting portions is the other fitting portion. A rotary machine comprising a positioning fitting insertion portion formed to extend in an axial direction from a portion. 3. The rotating machine according to claim 1, wherein the positioning fitting portion is inserted into the slot having the largest circumferential width.