JP2004173452A - Rotor for electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor for an electric motor that enables a fixed amount of varnish to be impregnated sufficiently into windings, that prevents a centrifugal force from moving the windings, and that reduces vibrations and noise by having well-balanced rotations. <P>SOLUTION: This rotor comprises an iron core 3, that has a commutator 4 fixed to a shaft 2 and a plurality of slots 5, windings wound in the slots 4, wedges 7 inserted into the openings of the slot 4, a rectifier-side cover 10a that covers a rectifier-side windings-exposed portion 6a having a varnish dropping hole cum rectifier running hole 11 for the commutator 4 at the central portion with wedges 7a provided protrusively from its circumferential edge, and an opposite rectifier-side cover 10b, that covers an opposite rectifier-side windings-exposed portion 6b having a shaft penetration hole for the shaft 2 at the central portion with wedges 7b, provided protrusively from its circumferential edge. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor rotor, and more particularly, to a motor rotor that has been subjected to a varnish treatment for preventing movement of windings caused by centrifugal force of a motor rotor used in a vacuum cleaner or the like.
[0002]
[Prior art]
In the motor rotor, a cutout is provided in the wedge to release gas to the outside, so that gas does not stay inside when varnish is injected so that the varnish penetrates all over the coil, and high output In order to cope with the high-speed rotation of the electric motor for the purpose of realization, the mechanical strength is increased (for example, Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-45693 A (paragraphs 0009-0012, FIGS. 1 and 2)
[0004]
[Problems to be solved by the invention]
Conventional varnish treatment of motor rotors is performed by arranging the motor rotor horizontally, dropping and injecting varnish from both sides of the coil end, and gas is released from the notch in the wedge and the varnish penetrates inside. Although it is made to prevent the winding from spreading outward due to centrifugal force at the time of rotation, it takes time to penetrate into the inside of the winding using the capillary phenomenon of the dropped liquid varnish, In addition, since the varnish is dripped while rotating the motor rotor, the varnish does not penetrate and drips down from the outer surface of the winding. There was a problem of not getting around.
[0005]
Further, the penetration of the varnish cannot be confirmed unless the iron core is cut, and it is difficult to make the thickness of the varnish adhered to the surface of the winding uniform. Therefore, there is a problem that imbalance occurs during operation of the electric motor, which causes vibration and noise. If the varnish is not sufficiently penetrated into the motor rotor, a space is generated in the winding, and the heat generated in the winding is accumulated in the space, so that the temperature of the rotor itself does not easily cool down during operation of the motor. As a result, the electric resistance of the windings increases and the efficiency of the motor decreases, and the space moves the windings due to the centrifugal force, causing the motor rotor to become unbalanced and causing vibration and noise. was there.
[0006]
Further, the number of wedges of a general motor rotor is the same as the number of slots 22. According to the number of slots, the wedge is rotated by an angle of 22/360 ° by a wedge insertion device having an angle indexing function. Since the work of inserting one by one is performed, there is a problem that workability is poor.
[0007]
The present invention has been made to solve the above-mentioned problem, and it is possible to sufficiently infiltrate a fixed amount of varnish into a winding, to prevent movement of the winding due to centrifugal force, to have a good rotational balance, and to reduce vibration and noise. It is an object of the present invention to provide a rotor for an electric motor.
[0008]
[Means for Solving the Problems]
A motor rotor according to the present invention includes a commutator attached to a shaft, an iron core having a plurality of slots, a winding wound around the slots, and a wedge inserted into the slot openings. In the rotor for the motor, a commutator side cover that covers the commutator-side winding exposed portion, has a commutator escape hole in the center at the center, and has the wedge protruded from a peripheral portion, A non-rectifying side cover, which covers the winding exposed portion on the slave side, has a shaft through-hole of the shaft at the center, and the wedge projects from the peripheral edge, and the shaft through-hole or the commutator escape hole. A varnish dropping portion provided on at least one inner peripheral edge portion.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a perspective view of a motor rotor according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of the motor rotor, FIG. 3 is an exploded perspective view of the motor rotor, and FIG. It is principal part sectional drawing of a rotor.
In FIGS. 1 to 3, in a motor rotor 1, an iron core 3 and a commutator 4 are press-fitted into a shaft 2. As shown in FIG. 4, the iron core 3 is formed in a U-shape, and 22 slots 5 are provided radially around the shaft 2. An overhang portion 5a is formed in an opening 5b of the slot 5, an insulating coating 18 is provided inside the slot 5, a winding 6 is accommodated as a bundle of wound copper wires, and a wedge 7 is formed. It is inscribed in the overhang portion 5a.
[0010]
As shown in FIGS. 1 to 3, at the time of winding, when moving from the slot 5 to the next slot, the commutator-side winding exposed portion 6 a on the commutator 4 side of one end of the shaft 2 of the iron core 3, the other end direction The exposed portion 6b of the anti-commutator side winding opposite to the side of the commutator 4 is formed.
The commutator-side winding exposed portion 6a has a varnish dropping hole and a commutator escape hole 11 at the center, and is covered with a commutator-side cover 10a having a wedge 7a protruding from a peripheral edge thereof. The line exposed portion 6b has a shaft through hole 17 of the shaft 2 at the center portion, and is covered with an anti-rectification side cover 10b having a wedge 7b protruding from a peripheral portion.
The varnish dropping hole / commutator escape hole 11 has a larger inner diameter than a normal commutator escape hole for passing the commutator 4 when the commutator 4 is attached to the motor rotor 1. The distance from the outer diameter is set to a size that allows varnish injection, and is used as a varnish dropping portion for dropping varnish.
[0011]
The wedges 7a and 7b are half the length of the slot 5 and are integrally formed with the rectifying-side cover 10a and the anti-rectifying-side cover 10b to form the wedge 7. The rectifying side cover 10a and the anti-rectifying side cover 10b are made of a plastic material or the like.
When the wedges 7a and 7b are mounted on the motor rotor 1, they are mounted so as to be inscribed in the overhang portion 5a of the iron core 3.
Further, between the commutator side cover 10a and the commutator side winding exposed portion 6a, a commutator side space Aa which is a filling space portion for filling the varnish 9 at a predetermined interval, an anti-rectifier side cover 10b and an anti-rectifier side cover. An anti-commutator-side space Ab at a predetermined interval for filling the varnish 9 is formed between the child-side winding exposed portions 6b.
[0012]
Next, the assembly of the rectifying-side cover 10a and the anti-rectifying-side cover 10b of the electric motor rotor 1 configured as described above, and varnish processing will be described with reference to FIGS.
First, while passing the shaft 2 through the shaft through-hole 17 so that the anti-rectifying-side cover 10b covers the anti-commutator-side winding exposed portion 6b, all of the wedges 7b are simultaneously inscribed in the slots 5 and in contact with the overhanging portions 5a. Insert and attach while positioning.
Next, the entire wedge 7a is simultaneously placed in the slot 5 while the commutator 4 is passed through the varnish dropping hole 11 and the commutator escape hole 11 so that the commutator side cover 10a covers the commutator side winding exposed portion 6a. It is inserted and attached while positioning and inscribed in the part 5a.
[0013]
Next, as shown in FIG. 1, the motor rotor 1 is kept upright, and the varnish dripping nozzle 8 is placed on the varnish dripping hole / commutator escape hole 11 of the commutator side cover 10a. Is dropped on the commutator side winding exposed portion 6a. At this time, the nozzle 8 is fixed and the motor rotor 1 is rotated, or the motor rotor 1 is fixed and the nozzle 8 is moved along the inner periphery of the varnish dropping hole and commutator escape hole 11. .
The varnish 9 is sufficient for the commutator-side winding exposed portion 6a, the anti-commutator-side winding exposed portion 6b, the winding 6 including the winding in the slot 5, the commutator-side space Aa, and the anti-commutator-side space Ab. A predetermined amount is added dropwise so as to penetrate the liquid.
After the varnish 9 is dropped, the motor rotor 1 is kept upright and rotated at a predetermined number of revolutions so that the varnish 9 permeates the whole.
[0014]
As described above, the wedges 7a and 7b integrally formed on the commutator-side cover 10a and the anti-commutator cover 10b having a plurality of wedges 7a and 7b can be simultaneously inserted into the slots 5, thereby shortening the working time. it can. Further, since the wedges 7a and 7b are integrally formed, the number of parts can be reduced.
Further, since the integrally formed wedge 7 is inserted while being positioned by being inscribed in the overhang portion 5a of the slot 5, even in the commutator side cover 10a having a varnish dropping hole and commutator escape hole 11 in the center, Since there is no eccentricity with respect to the shaft 2 and it can be fixed to the rotor 1 for the electric motor, the space can be kept uniform, and further, imbalance due to the mounting of the commutator side cover 10a and the anti-commutator cover 10b can be prevented. be able to.
[0015]
Also, since the winding portion 6 of the motor rotor 1 is completely covered with the wedge 7 and the cover 10, when the varnish 9 is poured into the cover, the same as when the motor rotor 1 is dipped in the varnish tank. The state can be easily created, and the varnish can sufficiently penetrate into the winding.
Dove pickling is the best method for the varnish permeability, but before the varnishing step, the core 3 or the shaft 2 is subjected to masking, and after the step, an extra varnish 9 is cut off. Specifically, the method shown in the conventional example is adopted. However, in this embodiment, there is obtained no troublesome operation such as masking or scraping off the varnish 9, and an effect that the permeability of the pickled pickle is good is obtained.
Therefore, there is no space between the windings of the motor rotor 1 that has sufficiently penetrated, and it is possible to prevent the windings from moving due to centrifugal force. Further, since the windings cover the entire windings, they are fixed with the varnish 9. The exposed portion of the winding can be further fixed, and the rotational balance is good, and the imbalance that reduces vibration and noise can be eliminated.
In addition, by controlling the amount of the varnish into the rectifying side cover 10a and the anti-rectifying side cover 10b, the varnish amount can be easily managed.
[0016]
In this embodiment, the commutator escape hole of the commutator side cover 10 is a varnish dripping hole / commutator escape hole 11 having an inner diameter larger than that of a normal commutator escape hole. The gap is formed to have a size that allows varnish injection, and a varnish dropping portion for dropping varnish is used. The commutator side cover 10 is a normal commutator escape hole, and the shaft through hole 17 of the anti-commutator cover 10b is used. It is also possible to form a varnish dropping portion for dropping varnish by making the gap between the outer diameter of the shaft 2 and the outer diameter of the shaft 2 as large as a varnish dropping hole and a shaft through hole.
[0017]
Embodiment 2 FIG.
In the first embodiment, the commutator escape hole of the commutator side cover 10a is a varnish dripping hole / commutator escape hole 11 having an inner diameter larger than that of a normal commutator escape hole, and a gap between the commutator 4 and the outer diameter of the commutator 4 is set. The varnish was formed to have a size allowing varnish injection, and the varnish dropping portion was used for dropping varnish. However, the commutator escape hole of the commutator side cover 10c and the shaft through hole 17 of the anti-commutator cover 10b were formed to have normal sizes. The dripping part is at least one notch provided on the inner peripheral edge of the commutator escape hole.
[0018]
FIG. 5 is a perspective view of a motor rotor according to a second embodiment of the present invention, and FIG. 2 is a perspective view of a main part of the motor rotor. The same parts as those in FIG. 1 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. 5 and 6, the commutator side cover 10c is provided with a hole peripheral portion 18 covering up to the winding connection portion 4a of the commutator 4, a commutator escape hole 16 of a normal size, and a cutout 15 for varnish dripping. .
[0019]
In this configuration, the commutator-side cover 10a and the anti-rectifier-side cover 10c are assembled in the same manner as in the first embodiment.
[0020]
Next, as shown in FIG. 5, the motor rotor 1 is kept upright, the varnish dripping nozzle 8 is placed on the varnish dripping notch 15 of the commutator side cover 10c, and the varnish 9 is placed on the commutator side. It is dropped on the winding exposed part 6a. At this time, the varnish 9 also includes the commutator-side winding exposed portion 6a, the anti-commutator-side winding exposed portion 6b, the winding 6 including the winding in the slot 5, the commutator-side space Aa, and the anti-commutator-side space. A predetermined amount is dropped so as to sufficiently penetrate the Ab.
After the varnish 9 is dropped, the motor rotor 1 is kept upright and rotated at a predetermined number of revolutions so that the varnish 9 permeates the whole.
[0021]
As described above, a fixed amount of varnish can be sufficiently penetrated into the winding, the movement of the winding due to centrifugal force can be prevented, and the unbalance that has a good rotational balance and reduced vibration and noise can be eliminated.
[0022]
The varnish dropping notch 15 may be provided in the shaft through hole 17 of the anti-commutator cover b.
Instead of the notch 15, a varnish dropping hole may be provided near the inner peripheral edge of the shaft through hole 17 or the commutator escape hole 18.
[0023]
Embodiment 3 FIG.
In the present embodiment, a varnish guide wall is formed in the varnish dropping / commutator escape hole shown in FIGS. 1 and 2 in the first embodiment. Third Embodiment FIG. 7 is a perspective view of a motor rotor according to a third embodiment of the present invention. In the figure, a varnish guide wall 12 is formed extending from a varnish drip and commutator escape hole 11 shown in FIG. 2 of the first embodiment in the shaft axial end direction. Omitted.
[0024]
In this configuration, the varnish 9 is prevented from accumulating and overflowing, and the varnish dropped from the nozzle 8 due to the vibration of the equipment for rotating the motor rotor 1 can be prevented from adhering to the outside of the cover 10a. Therefore, it is possible to prevent the varnish from adhering to the cover 10a and to prevent the occurrence of imbalance. The varnish injection amount can also be injected in anticipation of the amount of the varnish permeating up to the height of the varnish guide wall 12.
[0025]
When a varnish dripping portion is provided in the shaft through hole of the anti-commutator cover 10b, a varnish guide wall may be provided on the inner peripheral edge of the varnish dripping / shaft through hole.
[0026]
Embodiment 4 FIG.
In the present embodiment, when the dripping portion is provided on the commutator-side cover and the shaft through-hole is provided in the anti-commutator-side cover, a varnish reservoir is formed near the periphery of the shaft through-hole.
FIG. 8 is an exploded perspective view of a motive rotor according to a fourth embodiment. In the figure, a varnish reservoir wall 21 having a predetermined height protruding from an outer periphery of a hole through which the shaft 2 passes is provided on a surface of the anti-commutator side cover 10b on the winding side. The other configuration is the same as that of FIG. 3 of the first embodiment, and the description is omitted.
[0027]
In such a configuration, a fixed amount of the varnish 9 is stored in the anti-rectification side cover 10b, the anti-rectification side cover 10b is attached, the varnish is dropped in the same manner as in the first embodiment, and the time of varnish injection is reduced. Can be shortened.
[0028]
Embodiment 5 FIG.
In the first to fourth embodiments, the varnish process is performed by setting up the rotor for the electric motor, but in the present embodiment, the varnish process is performed with the rotor 1 for the electric motor being horizontal.
FIG. 9 is a cross-sectional view of a main part of a motive rotor according to a fifth embodiment. In the figure, the same parts as those in FIG. 1 of the first embodiment and FIG. 6 of the second embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0029]
In FIG. 9, the commutator-side cover 10 c covers up to the commutator-side winding exposed portion 6 a and the winding connection portion 4 a of the commutator 4, similarly to the one shown in FIG. 6 of the second embodiment. Further, the commutator cover 10c and the anti-commutator cover 10b were provided with a varnish inlet 13 and a fine hole 14 for venting air, respectively.
[0030]
In this configuration, when the nozzle 8 is inserted into the varnish dropping hole 13 and the varnish 9 is dropped, the varnish 9 is rectified by rotating the motor rotor 1 at a predetermined rotation speed at which the varnish does not come off after the nozzle 8 is pulled out. While penetrating into the slot 5 while filling the rotor side space Aa and the anti-commutator side space Ab. At this time, the air in the commutator cover 10c and the anti-commutator cover 10b does not fall down due to the adhesive force of the varnish. The air is discharged from the air vent, and the inside of the commutator cover 10c, the anti-commutator cover 10b, and the inside of the slot 5 are sufficiently filled with the varnish.
[0031]
As described above, since there is no space between the windings of the motor rotor 1 in which the varnish has sufficiently penetrated, it is possible to prevent the windings from moving due to centrifugal force, and to further cover the entire windings. The exposed portion of the winding fixed by the varnish 9 can be further nationalized, the movement of the winding due to centrifugal force can be prevented, and the unbalance that has good rotational balance and reduced vibration and noise can be eliminated.
In addition, by putting a fixed amount of varnish into the commutator cover 10c and the anti-commutator cover 10b, the varnish amount can be easily managed.
[0032]
In the first to fourth embodiments, the same effect can be obtained even if the air vent hole 14 is provided.
[0033]
Embodiment 6 FIG.
In the first to fifth embodiments, the wedges 7a and 7b of the commutator cover 10a and the anti-commutator cover 10 are half the length of the slot 5, but in the present embodiment, the length and the number are changed. .
FIG. 10 is an exploded perspective view of a motive rotor according to a sixth embodiment. In the drawing, the commutator side cover 10a and the wedge 10b of the anti-rectifier side cover are provided so as to correspond to every other slot 5, and the length is the same as that of the slot 5, and the commutator side cover 10a is opposite to the wedge 10b. The wedges 7a and 7b of the rectifying cover 10b are inserted into the slots 5 alternately.
[0034]
In this configuration, the number of wedges 7a and 7b (generally 22) is reduced to half (11), the workability is good, and the wedges 7a and 7b are alternately mounted in the slots. Even with the open commutator-side cover 10a having no eccentricity, it can be fixed to the motor rotor 1 without eccentricity with respect to the shaft 2, so that the rotational balance is good, and the unbalance that reduces vibration and noise can be eliminated. .
[0035]
The wedges 7a and 7b are provided so as to correspond to each slot, and the lengths are alternately long and short, and the long and short wedges of the commutator side cover 10a and the anti-rectification side cover 10b are respectively protruded. You may make it fit in the same slot 5 so that it may fit.
[0036]
【The invention's effect】
As described above, according to the present invention, a commutator attached to a shaft and an iron core having a plurality of slots, a winding wound around the slots, and a wedge inserted into the slot openings are provided. And a commutator side cover in which a commutator escape hole for the commutator is provided at a central portion, and the wedge protrudes from a peripheral portion. An anti-rectifying-side cover that covers the commutator-side winding exposed portion, has a shaft through-hole of the shaft at the center, and has the wedge protruding from a peripheral portion; and the shaft through-hole or the commutator escape hole. A varnish dropping portion provided on at least one inner peripheral edge of the varnish, so that a fixed amount of varnish can be sufficiently penetrated into the winding, preventing movement of the winding due to centrifugal force, and rotating the varnish. Well-balanced vibration and noise It can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a motor rotor according to a first embodiment of the present invention.
FIG. 2 is a side view and a sectional view of a main part of a motor rotor according to a first embodiment of the present invention.
FIG. 3 is an exploded perspective view of a motor rotor according to the first embodiment of the present invention.
FIG. 4 is a cross-sectional view of a main part of the motor rotor according to the first embodiment of the present invention.
FIG. 5 is a perspective view of a motor rotor according to a second embodiment of the present invention.
FIG. 6 is a perspective view of a main part of a motor rotor according to a second embodiment of the present invention.
FIG. 7 is a side view and a main part cross-sectional view of a motor rotor according to a third embodiment of the present invention.
FIG. 8 is an exploded perspective view of a motor rotor according to a fourth embodiment of the present invention.
FIG. 9 is a perspective view of a motor rotor according to a fifth embodiment of the present invention. FIG. 10 is an exploded perspective view of the motor rotor according to a sixth embodiment of the present invention.
FIG. 11 is an exploded perspective view of a motor rotor according to a sixth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Motor rotor, 2 shafts, 3 iron cores, 4 commutator, 4a winding connection part, 5 slot, 5a overhang part, 6 winding, 6a commutator side winding exposed part, 6b anti-commutator side winding Exposed portion, Aa, Ab space, 7, wedge, 7a commutator side wedge, 7b anti-commutator side wedge, 9 varnish, 10a, 10c commutator side cover, 10b anti-commutator side cover, 11 varnish drop hole and commutation Child escape hole, 12 varnish guide, 13 varnish drop hole, 14 micro hole for venting, 15 varnish drop notch, 16 commutator escape hole, 17 shaft through hole, 21 varnish reservoir wall.

Claims (13)

In a motor rotor including a commutator attached to a shaft and an iron core having a plurality of slots, a winding wound around the slots, and a wedge inserted into the slot openings,
A commutator side cover in which the commutator side winding exposed portion is covered, a commutator escape hole of the commutator is provided in a central portion, and the wedge protrudes from a peripheral portion;
An anti-commutation side cover that covers the winding exposed portion on the anti-commutator side, has a shaft through-hole of the shaft at the center, and the wedge protrudes from a peripheral edge portion,
A dripping portion for varnish dripping provided on at least one inner peripheral edge of the shaft through-hole or the commutator escape hole,
A rotor for an electric motor, comprising: The drip portion is formed such that a gap between the inner diameter of the commutator escape hole and the outer diameter of the commutator or the outer diameter of the shaft through-hole and the shaft is large enough to allow varnish injection. 2. The rotor for an electric motor according to claim 1, wherein the hole is a child escape hole or a varnish dripping / shaft through hole. 3. A rotor for an electric motor according to claim 2, wherein a varnish guide wall extending from a peripheral portion of the varnish dripping / commutator escape hole or a periphery of the varnish dripping / commutator through hole toward the shaft shaft end is formed. . The rotor for an electric motor according to claim 1, wherein the drip portion is at least one notch provided in an inner peripheral edge of the shaft through hole or the commutator escape hole. The rotor for an electric motor according to claim 1, wherein the drip portion is at least one varnish drip hole provided near an inner peripheral edge of the shaft through hole or the commutator escape hole. 6. A filling space portion for filling a varnish is formed between the rectifying side cover and the exposed wire portion and between the anti-rectifying side cover and the exposed wire portion, respectively. Rotor for electric motor. 7. A varnish pool portion is formed near the periphery of the shaft through-hole when the drip portion is provided on the commutator-side cover and the shaft through-hole is provided in the anti-commutator-side cover. A rotor for an electric motor according to any one of the above. The rotor for an electric motor according to any one of claims 1 to 7, wherein an air vent hole is formed in at least the commutator-side cover or the anti-rectification-side cover on which the dropping portion is not provided. In a motor rotor having a commutator attached to a shaft and an iron core having a plurality of slots, a winding made of a copper wire wound around the slots, and a wedge inserted into the slot openings,
A commutator side cover in which the commutator side winding exposed portion is covered, a commutator escape hole of the commutator is provided in a central portion, and the wedge protrudes from a peripheral portion;
An anti-commutation side cover that covers the winding exposed portion on the anti-commutator side, has a shaft through-hole of the shaft at the center, and the wedge protrudes from a peripheral edge portion,
A dropping portion for varnish dropping provided on each of the commutator side cover and the anti-rectification side cover,
A rotor for an electric motor, comprising: The rotor for an electric motor according to claim 9, wherein holes for venting air are formed in each of the commutator side cover and the anti-rectification side cover. The wedges of the commutator side cover and the anti-rectifier side cover are provided so as to correspond to every other slot, and have the same length as the slots, and the commutator side cover and the anti-rectifier side cover have the same length. The motor rotor according to any one of claims 1 to 10, wherein wedges are alternately inserted into the slots. The wedges of the commutator side cover and the anti-rectification side cover are provided so as to correspond to each slot, and the lengths are alternately long and short, and the lengths of the commutator side cover and the anti-rectification side cover are short and long. The rotor for an electric motor according to any one of claims 1 to 11, wherein the wedges are mounted in the same slot such that the wedges abut each other. The rotor for an electric motor according to any one of claims 1 to 12, wherein the wedge is formed so as to be attached to an overhang portion of the iron core.

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