JP3458324B2 - Commutator motor - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention is directed to improving the efficiency and noise of commutator motors.

[0002]

2. Description of the Related Art FIG. 14 is a partial side view of an armature of a conventional commutator motor. In the figure, 1 is an armature core of a commutator motor, 2 is a plurality of teeth provided on the outer periphery of an armature core 6, and 3 is formed between a plurality of teeth 2 respectively. A plurality of slots of the mouth 3a, 4 is an insulating film provided on the inner peripheral surface of each slot 3, 5 is a coil wound in the slot 3 having the insulating film 4 provided on the inner peripheral surface, and 6 is a coil 5 is a wedge made of paper mounted in the slot 3 in which it is wound. The wedge 6 serves to maintain insulation between the teeth 2 of the armature core 1 and the coil 5 and to prevent the coil 5 from moving out of the slot 3 due to centrifugal force when the armature rotates. However, since there is a step difference of 2 to 3 mm between the outer peripheral surface of the armature core 1 and the wedge 6 for the number of slots, there is a problem that mechanical loss due to wind pressure during high speed rotation and noise in a high frequency range occur. .

In recent years, demands for efficiency improvement and noise reduction in commutator motors mounted on electric vacuum cleaners have been increasing.
Therefore, as a technique relating to a wedge mounted in a slot of an armature core of a conventional commutator motor, Japanese Patent Application Laid-Open No. 5-21 is known.
There is one disclosed in Japanese Patent No. 1739. Such technology
As one of the measures against the noise of the electric motor in the armature and the stator, a wedge in which an electrically insulating resin and a magnetic material are integrated is used to reduce noise in a high frequency range.

[0004]

However, according to the technique disclosed in Japanese Patent Laid-Open No. 5-217139, the wedge has a structure in which the plate-shaped electrically insulating resin and the plate-shaped magnetic material are integrated with each other. In addition to being disadvantageous, it is not possible to reduce the step between the outer peripheral surface of the core and the wedge in terms of shape.Therefore, in the case of an electric motor driven at high speed, the influence of aerodynamic resistance cannot be ignored, and even during high speed rotation. However, the problems of mechanical loss due to the wind pressure and noise in the high frequency range cannot be solved.

The present invention has been made to solve the above-mentioned problems, and it is possible to secure a stable high speed operation by reducing mechanical loss due to wind pressure during high speed rotation and noise in a high frequency range. The purpose is to obtain a commutator motor.

[0006]

A commutator motor according to claim 1 of the present invention comprises an armature core, a plurality of slots formed between a plurality of teeth provided on the outer periphery of the armature core,
The coil is wound around each of the plurality of slots, and the cross-section T is made of a resin with excellent heat resistance that is installed in each of the plurality of slots and maintains insulation between the teeth and the coil.
A plurality of wedges formed in a letter shape and including a wedge main body located in the slot and a wedge protrusion that closes the narrow slot opening; and an annular shape that is connected to the wedge protrusions of the plurality of wedges and covers the outer peripheral surface of the armature core. The insulator and the insulator are integrally molded with the same resin.

A commutator motor according to a second aspect of the present invention has an armature core, a plurality of slots formed between a plurality of teeth provided on the outer periphery of the armature core, and a plurality of slots wound around each of the plurality of slots. And a plurality of wedges respectively mounted in the plurality of slots to maintain insulation between the teeth and the coils, the wedges being wound around the coil in the slots and the narrow slot openings. The heat-resistant yarn is wound to a height corresponding to the outer peripheral surface of the armature core.

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 is a partial side view of an armature of a commutator motor according to a first embodiment of the present invention, and FIG. 2 is a side sectional view showing a state in which the armature is incorporated in a commutator motor for a vacuum cleaner. 3 is a side view of the armature, and FIG. 4 is a graph showing efficiency and noise characteristics of the commutator motor according to the first embodiment of the present invention. In the figure, 1 is an armature core of a commutator motor, 2 is an armature core 6
A plurality of teeth 3 provided on the outer circumference of each of the plurality of teeth 2 are respectively formed between the plurality of teeth 2, have a U-shaped cross section, and have a slot narrowing opening 3 a. An insulating film provided on the surface, 5 is a coil wound in a slot 3 having an insulating film 4 provided on the inner peripheral surface, 9 is a commutator of a commutator motor, 10 is a shaft of the commutator motor, and 16 is a commutator motor. It is a paper wedge provided on the outer peripheral side of the core in the slot 3 around which the coil 5 is wound.

The wedge 16 according to the first embodiment is bent in a V-shape in cross section, and is directed toward the outer periphery of the armature core 1 so that the protruding side of the fold 16a is along the tooth 2, and the armature core 1 Slot narrow opening 3a near the outer periphery of
It is arranged in the slot 3 so as to face the inside . The fold 1 of the wedge 16 thus arranged in the slot 3
The distance from the protrusion side of 6a to the outer peripheral surface of the armature core 1 is 0.
It is set in the range of 1 mm.

The wedge 16 having a V-shaped cross section is directed toward the outer circumference of the armature core 1 so that the protruding side of the wedge 16 is along the tooth 2 and near the outer circumference of the armature core 1. by being placed in a slot narrower opening slot 3 so as to face the inside 3a, the wedge 16
The distance from the protrusion side of the fold 16a to the outer peripheral surface of the armature core 6 is in the range of 0 to 1 mm, and the step between the position of the fold 16a of the wedge 16 and the outer peripheral surface of the armature core 6 is small, It is possible to reduce mechanical loss due to wind pressure during high-speed rotation and noise in a high frequency range.

For example, as shown in the graph of FIG. 4, by reducing the uneven step between the outer peripheral surface of the armature core 1 and the wedge 16 in the slot 3 from 3.0 mm to 0.3 mm, the motor efficiency of a certain model is improved. It can be improved from 50% to 51%, and according to the noise test, it can be improved from 85 dB to 84 dB. Also, fold 1 of wedge 16
Since projection side 6a is disposed in the slot 3 so as to face in the slot narrow opening 3a in the vicinity of the outer periphery of the armature core 1, the effective cross-sectional area to fit the coil 5 increases in the slot 3, the space factor It has a workable effect on large specifications.

Embodiment 2. 5 is a partial side view of an armature according to a second embodiment of the present invention, and FIG. 6 is a perspective view of an insulator covering a wedge of the armature. In the figure, the same components as those in the first embodiment of the present invention are designated by the same reference numerals, and the description of the duplicate components will be omitted. In the second embodiment, the armature core 1
The entire outer peripheral surface is covered with a thin annular insulator 17 in the form of a film having excellent heat resistance, such as polyester, polyamideimide, PET (polyethylene terephthalate). Is. A wedge 6 similar to the conventional one is mounted in each slot 3.

In the second embodiment, since the entire outer peripheral surface of the armature core 1 is covered with the film-shaped thin annular insulator 17 having excellent heat resistance, the irregularities between the teeth 2 of the armature core 1 are prevented. It is completely eliminated, and mechanical loss due to wind pressure during high-speed rotation and noise in the high frequency range can be reduced. Note that the wedge 6 mounted in the slot 3 is the same as the conventional wedge 6, but the wedge 16 of the first embodiment of the present invention is not used.
But needless to say.

Embodiment 3. 7 is a partial side view of an armature of a commutator motor according to a third embodiment of the present invention, and FIG. 8 is a perspective view of a wedge of the armature. In the figure, the same components as those in the first embodiment of the present invention are designated by the same reference numerals, and the description of the duplicate components will be omitted. The wedge 26 of the third embodiment
Is formed of a resin having excellent heat resistance and heat resistance, such as PET, having an inverted T-shaped cross section, and is formed by a wedge main body 26a located in the slot 3 and a wedge protrusion 26b closing the narrow slot opening 3a. There is. The outer surface of the wedge protrusion 26b of the wedge 26 is formed into a curved surface similar to the outer peripheral surface of the armature core 1.

Thus, the wedge 26 having an inverted T-shaped cross section
Has its wedge body 26a located in the slot 3,
Since the wedge protrusion 26b closes the narrow slot opening 3a in the inserted state, there is almost no step between the position of the wedge 26 and the outer peripheral surface of the armature core 1, and mechanical loss due to wind pressure during high-speed rotation and It is possible to reduce noise in a high frequency range. Further, since the outer surface of the wedge protrusion 26b is formed into a curved surface similar to the outer peripheral surface of the armature core 1, the step between the position of the wedge 26 and the outer peripheral surface of the armature core 1 is completely eliminated, and the speed is further increased. It is possible to reduce mechanical loss due to wind pressure during rotation and noise in a high frequency range. Further, the reason why the wedge 26 of the third embodiment is molded with a resin having excellent heat resistance and heat resistance is that it is easy to manufacture a wedge having a complicated inverted T-shaped cross section.

Fourth Embodiment 9 is a perspective view of a wedge of an armature according to a fourth embodiment of the present invention. In the figure, the same components as those in the first embodiment of the present invention are designated by the same reference numerals, and the description of the duplicate components will be omitted. In this Embodiment 4,
An insulating ring 27 having the same diameter as the outer diameter of the armature core 1 is connected to one end side of each wedge 26 of the second embodiment having the same number as the slots 3. The plurality of wedges 26 and the insulating ring 27 are integrally formed of PET. In the fourth embodiment, as in the second embodiment, there is almost no step between the position of the wedge 26 and the outer peripheral surface of the armature core 1, and mechanical loss due to wind pressure during high-speed rotation and noise in the high frequency range are eliminated. It can be reduced. In addition, the wedge 26 is in the slot 3
Since the same number of wedges 26 and insulating rings 27 are integrally formed with each other, the same number of wedges 26 can be inserted into the plurality of slots 3 at a time, and the manufacturing can be simplified.

Embodiment 5. 10 is a partial side view of an armature according to a fifth embodiment of the present invention, and FIG. 11 is a perspective view of a wedge of the armature. In the drawings, the first embodiment of the present invention
The same configurations as the above are denoted by the same reference numerals, and the description of the duplicate configurations will be omitted. In the fifth embodiment, an annular insulator 28 that covers the outer peripheral surface of the armature core 1 is connected to the wedge protrusions 26b of the wedges 26 of the second embodiment in the same number as the slots 3. The plurality of wedges 26 and the annular insulator 28 are P
It is integrally molded with ET. Embodiment 4 as described above
Then, since the outer peripheral surface of the armature core 1 is covered with the annular insulator 47, the unevenness between the teeth 2 of the armature core 1 is completely eliminated as in the second embodiment, and mechanical force due to wind pressure during high speed rotation is eliminated. It is possible to reduce loss and noise in the high frequency range. Further, since the plurality of wedges 26 are integrally formed with the annular insulator 28, the annular insulator 28 prevents the wedges 26 from moving outside during high speed rotation of the armature.

Sixth Embodiment FIG. 12 is a partial side view of the armature according to the sixth embodiment of the present invention. In the figure, the same components as those in the first embodiment of the present invention are designated by the same reference numerals, and the description of the duplicate components will be omitted. In the sixth embodiment, for example, a yarn 29 having excellent heat resistance, such as hemp or nylon, is wound from above the bundle of coils 5 in the slots 3, and the narrow slot openings 3a are closed while being housed between the coils 3 to close the armature core. The wedge is formed by winding up to the outer peripheral surface of 1.

In the sixth embodiment, the yarn 29 having excellent heat resistance, which is wound from above the bundle of coils 5 in the slot 3, is wound up to the outer peripheral surface of the armature core 1. Therefore, the armature core 1 Since the irregularities on the outer peripheral surface are eliminated, mechanical loss due to wind pressure during high-speed rotation and noise in the high frequency range can be reduced. Further, since the yarn 29 having excellent heat resistance is only wound, it is inexpensive.

Embodiment 7. FIG. 13 is a partial side view of the armature according to the seventh embodiment of the present invention. In the figure, the same components as those in the first embodiment of the present invention are designated by the same reference numerals, and the description of the duplicate components will be omitted. In the seventh embodiment, for example, an adhesive resin 30 such as epoxy is permeated into the bundle of the coils 5 in the slots, and the slot narrow openings 3a are closed to fill up to the outer peripheral surface of the armature core 1. And a wedge formed by being fixed to the narrow slot opening 3a.

In the seventh embodiment, since the adhesive resin 30 that has penetrated into the bundle of coils 5 in the slot 3 is filled up to the outer peripheral surface of the armature core 1, the outer periphery of the armature core 1 is filled. The unevenness of the surface is eliminated, and mechanical loss due to wind pressure during high-speed rotation and noise in the high frequency range can be reduced. Furthermore, there is an advantage that the varnish used for fixing the coil 5 in the related art is unnecessary, and at the same time, the insulation between the tooth 2 and the coil 5 is maintained.

[0027]

As described above, according to the first aspect of the present invention.
According to the article, a plurality of wedges formed of a resin having excellent heat resistance in a T-shaped cross-section and including a wedge main body located in the slot and a wedge projection for closing the narrow opening of the slot and a wedge projection of the plurality of wedges are formed. Since the annular insulator that is connected and covers the outer peripheral surface of the armature core is integrally molded with the same resin, there are no irregularities between the teeth of the armature core, and mechanical loss due to wind pressure during high-speed rotation and In addition to the effect of reducing the noise in the high frequency range, the annular insulator has the effect of preventing the wedge from moving outside during high-speed rotation of the armature.

According to the second aspect of the present invention, the yarn having excellent heat resistance is wound from above the bundle of coils in the slots, and the slots and the narrow openings of the slots are closed while being housed between the coils to close the outer peripheral surface of the armature core. Since the wedge is formed by winding up to the height corresponding to, the irregularities on the outer peripheral surface of the armature core are eliminated, and there is an effect that mechanical loss due to wind pressure during high speed rotation and noise in a high frequency range can be reduced. Moreover, since the wedge is simply formed by winding a thread having excellent heat resistance, the cost is low.

[0029]

[0030]

[0031]

[0032]

[0033]

[Brief description of drawings]

FIG. 1 is a partial side view of an armature of a commutator motor according to a first embodiment of the present invention.

FIG. 2 is a side sectional assembly view showing a state in which the armature is incorporated in a commutator motor for an electric vacuum cleaner.

FIG. 3 is a side view of the armature.

FIG. 4 is a graph showing efficiency and noise characteristics of the commutator motor according to the first embodiment of the present invention.

FIG. 5 is a partial side view of an armature according to a second embodiment of the present invention.

FIG. 6 is a perspective view of an insulator covering a wedge of the armature.

FIG. 7 is a partial side view of an armature of a commutator motor according to a third embodiment of the present invention.

FIG. 8 is a perspective view of a wedge of the armature.

FIG. 9 is a perspective view of a wedge of an armature according to a fourth embodiment of the present invention.

FIG. 10 is a partial side view of an armature according to a fifth embodiment of the present invention.

FIG. 11 is a perspective view of a wedge of the armature.

FIG. 12 is a partial side view of an armature according to a sixth embodiment of the present invention.

FIG. 13 is a partial side view of an armature according to a seventh embodiment of the present invention.

FIG. 14 is a partial side view of an armature of a conventional commutator motor.

[Explanation of symbols]

1 armature core, 2 teeth, 3 slots, 5 coils, 16 wedges.

Front Page Continuation (72) Inventor Shuichi Otaka 1728 Omaeda, Ozo-gun, Hanazono-cho, Saitama Prefecture 1 Mitsubishi Electric Home Equipment Co., Ltd. (56) Reference JP-A-4-236141 (JP, A) JP-A-64- 89934 (JP, A) JP-A-2-32728 (JP, A) JP-A-4-364334 (JP, A) JP-A-56-83240 (JP, A) JP-A-59-113733 (JP, A) Actual Open Sho 48-58902 (JP, U) Actual Open Sho 50-142102 (JP, U) Actual Open Sho 51-18910 (JP, U) Actual Open Sho 54-142401 (JP, U) Japanese Patent Sho 42-20001 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 3/487 H02K 3/34

Claims (2)

(57) [Claims] 1. An armature core, a plurality of slots formed between a plurality of teeth provided on the outer periphery of the armature core, and a coil wound around each of the plurality of slots.
Respectively mounted in a plurality of slots, formed into a T-shaped cross section of a heat-resistant resin excellent for maintaining insulation between the teeth and the coil, wedge butt block the wedge body and the slot narrow opening located within the slot Of the plurality of wedges and an annular insulator that is connected to the wedge protrusions of the plurality of wedges and covers the outer peripheral surface of the armature core are the same.
A commutator motor characterized by being integrally molded with the above resin . 2. An armature core and an outer periphery of the armature core.
Slots formed between the formed teeth
And a coil wound around each of the plurality of slots,
It is installed in each of the multiple slots, and the teeth and
With multiple wedges to maintain insulation between the
Well, the wedge is inside the slot and the slot narrow opening.
At the armature core wound around the coil
Has heat resistance that is wound to a height that matches the outer peripheral surface of
A commutator motor, which is a thread .