JP2003129995A - Motor blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor blower with improved rate of immediate unbalance correction and little dispersion in performance by easily reducing initial unbalance. SOLUTION: The motor blower comprises a motor consisting of a stator 6 and a rotor 7 and having a rotating shaft 8 passing through the rotor 7, a rotary fan 11 mounted at one end of the rotating shaft 8 for rotation with the motor, and an approximately ring-shaped unbalance member 19 having asymmetrical mass distribution. The unbalance member 19 passing through the rotating shaft 8 is mounted at a proper position on the outer periphery face of the rotating shaft 8 in the opposite phase to that at the unbalance position of the rotor 7.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower used for a vacuum cleaner or the like. 2. Description of the Related Art FIG. 10 is a sectional view showing the structure of a conventional electric blower. In FIG. 10, reference numeral 1 denotes a frame, on which a bearing housing 2 is provided. Reference numeral 3 denotes a bracket fixed to the opening of the frame 1, and the bracket 3 is provided with a bearing housing 4 facing the bearing housing 2. Reference numeral 5 denotes an electric motor unit including a stator 6 and a rotor 7, and a rotating shaft 8 is supported between bearings 9a and 9b provided on the frame 1 and the bearing housings 2 and 4 of the bracket 3. . Reference numeral 18 denotes a dustproof washer, which is press-fitted and fixed to the rotating shaft 8 so that, for example, carbon powder of the carbon brush 17 worn by the commutator 13 does not enter the bearing 9b. FIG. 12 is a diagram illustrating a configuration of the dustproof washer. Reference numeral 10 denotes a fixed fan fixed to the bracket 3, 11 denotes a rotating fan mounted on the rotating shaft 8, 1
Reference numeral 2 denotes a fan cover, the outer periphery of the outer edge of which is press-fitted and fixed to the outer periphery of the bracket 3,
Is covered. FIG. 11 is a view showing the external structure of a rotor in a conventional electric blower, in which 13 is a commutator, 14 is a laminated core, 15 is a winding, and 16 is an insulating member. In the above-described configuration, when the power is turned on, the rotor 7 of the electric motor unit 5 rotates, the rotating fan 11 mounted on the rotating shaft 8 rotates at a high speed, and the blowing starts. In such an electric blower, the rotating fan 1
Since the rotor 1 is rotated at a high speed, if the rotating body is unbalanced, severe vibration occurs. Therefore, it is essential to correct the imbalance of the rotating body.
The outer periphery of the laminated core 14 is shaved while testing with a balancing tester or the like. In cases where the imbalance amount is severe, correction must be performed several times, and the ratio indicating the extent to which the imbalance correction has been performed is referred to as the orthogonality ratio. For example, assuming that the correction made by the automatic balance corrector is A, the correction made manually by the automatic balance corrector is B, and the correction made manually is B, the straightness ratio = [A / (A + B)] × 1
00 (%). [0005] The above-described conventional electric blower has a problem that it is difficult to correct the imbalance of the rotating body. [0006] As is well known, the imbalance correction of a rotating body requires a dynamic balance, that is, a dynamic balance. However, the imbalance in such an electric blower is as follows.
Static unbalance
e) In particular, the static imbalance of the rotor at the time of manufacture, that is, the total unbalance when the laminated core, commutator, winding, insulating paper, varnish, etc. are assembled to the components constituting the rotor and the rotating shaft. In spite of the large balance (this is referred to as the initial unbalance in this specification), the structure of the conventional electric blower was modified by shaving the outer periphery of the laminated core for all imbalances. Since there is an upper limit to the amount that can be cut at one time, the orthogonality ratio of the imbalance correction is low, and the performance is varied due to excessive cutting of the outer periphery of the laminated core. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has a structure capable of easily reducing the initial imbalance, thereby improving the straightness rate of the imbalance correction and reducing the performance variation. The purpose is to provide an electric blower. [0008] In order to achieve the above object, an electric blower according to the present invention includes a motor having a stator and a rotor, and having a rotating shaft penetrating the rotor. A rotating fan attached to one end of the rotating shaft and rotated by the electric motor; and a substantially ring-shaped unbalance member having an asymmetric mass distribution, wherein the unbalance member is located at an appropriate position on an outer peripheral surface of the rotating shaft. In addition, the rotor is mounted so as to be penetrated by the rotating shaft and in a phase opposite to an unbalanced position of the rotor. According to the electric blower of the present invention, an unbalanced member is mounted on a rotor which rotates at a high speed when energized, with the phase shifted from the unbalanced position of the rotor, thereby providing an initial unbalance of the rotor. The amount can be reduced. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of the electric blower of the present invention, and FIG. 2 is a view showing the appearance of the rotor of the electric blower of the present invention. In these drawings, the same reference numerals as those in FIGS. The same or corresponding portions are shown, and 19 is an unbalanced member mounted on the commutator 13 side of the rotating shaft 8. FIG. 3 is a view for explaining the unbalance member 19. As shown in the figure, the unbalance member 19 is formed in a substantially ring shape with an asymmetric mass distribution.
The mass distribution is biased in the direction of arrow P (this is referred to as the unbalanced position direction). FIG. 4 is a view of the rotor 7 on which the unbalance member 19 is mounted, as viewed from the direction of the white arrow in FIG. It is mounted with the same unbalance amount (arrow P) in the opposite phase to the balance position direction. As described above, the electric blower of the present invention has the unbalance position direction Q of the rotor 7 and the unbalance member 1.
9 is mounted in the opposite phase to the unbalance position direction P, the static imbalance of the rotor 7 is canceled by the unbalance member 19 having the same amount of imbalance, so that the initial imbalance can be reduced and the dynamic imbalance can be reduced. -Improve the direct rate of imbalance correction for balance. In the first embodiment, the unbalance member 19 is mounted on the commutator 13 side, but may be mounted at an appropriate position on the rotating shaft 8, so that only the unbalance member 19 is mounted. Thus, it is possible to correct the dynamic imbalance to some extent. Embodiment 2 FIG. FIG. 5 is a diagram for explaining the second embodiment of the present invention.
As shown in FIG. 19c, a plurality of unbalance members having different amounts of imbalance are prepared, and one or a plurality of unbalance members are mounted so as to be balanced with the amount of unbalance of the rotor 7. This is an effective means for the case where the unbalance amount is large or for fine adjustment of the balance. Embodiment 3 FIG. FIG. 6 is a view for explaining the third embodiment of the present invention, which is another embodiment in which the unbalance member 19 used in the first or second embodiment has a tooth shape. Reference numeral 20 denotes a tooth-shaped unbalance member.
Similarly, it is mounted on the commutator 13 side of the rotating shaft 8. In the third embodiment, after the tooth profile unbalance member 20 is mounted, the orthogonality of the correction of the unbalance can be improved by cutting (or folding) the teeth of the tooth profile portion in the same phase as the unbalance position of the rotor. it can. (For example, the teeth in the hatched portions in FIG. 6 are cut or broken.) As in the second embodiment, a plurality of tooth-shaped unbalance members having different unbalance amounts are prepared, and the unbalance amount of the rotor 7 is adjusted. It is also possible to use one or more of them in combination so as to be balanced. Embodiment 4 FIG. FIG. 7 is a view for explaining Embodiment 4 of the present invention. Reference numeral 21 denotes a retaining ring used for positioning a bearing. In Embodiment 4, the retaining ring 21 has an asymmetric mass distribution. , And is used as an unbalance member. In this manner, it is not necessary to separately provide an unbalance member and mount it. Embodiment 5 FIG. FIG. 8 is a view for explaining a fifth embodiment of the present invention. In the fifth embodiment, a plurality of retaining rings 21a to 21c having different amounts of unbalance are prepared and balanced with the amount of unbalance of the rotor 7. Thus, one or a combination of a plurality of them is used, which is an effective means for a case where the unbalance amount of the rotor 7 is large or for a fine balance adjustment, as in the second embodiment. Embodiment 6 FIG. FIG. 9 is a view for explaining a sixth embodiment of the present invention. In the sixth embodiment, a dustproof washer is formed so that the mass distribution is asymmetric, and this is used as the unbalance member 22. By doing so, it is not necessary to separately provide an unbalance member and mount it. As described above, the electric blower according to the present invention mounts the unbalanced member out of phase with the unbalanced position of the rotor so that the rotor can be unbalanced by the unbalanced member. Can be canceled, the initial imbalance amount of the rotor can be reduced, and the straightness rate of the imbalance correction can be improved. Furthermore, since an apparatus with a reduced initial imbalance amount can be obtained, the amount of cutting of the laminated core at the time of correcting imbalance is also reduced, and an effect is obtained such that an apparatus with less variation in performance due to the amount of cutting is obtained. is there. Further, an electric motor comprising a stator and a rotor and having a rotating shaft penetrating the rotor, a rotating fan attached to one end of the rotating shaft and rotated by the electric motor, and an asymmetric mass distribution. A substantially ring-shaped unbalanced member is provided, and the unbalanced member is mounted at an appropriate position on the outer peripheral surface of the rotating shaft, penetrated by the rotating shaft, and mounted in a phase opposite to the unbalanced position of the rotor. With this configuration, it is possible to correct the dynamic imbalance to some extent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a structure of an electric blower according to the present invention. FIG. 2 is a perspective view showing an external configuration of a rotor in the electric blower of the present invention. FIG. 3 is a diagram for explaining an unbalanced member. FIG. 4 is a diagram showing a mounting positional relationship of an unbalance member. FIG. 5 is a diagram for explaining a second embodiment of the present invention. FIG. 6 is a diagram for explaining a third embodiment of the present invention. FIG. 7 is a diagram for explaining a fourth embodiment of the present invention. FIG. 8 is a diagram for explaining a fifth embodiment of the present invention. FIG. 9 is a diagram for explaining Embodiment 6 of the present invention. FIG. 10 is a sectional view showing the structure of a conventional electric blower. FIG. 11 is a perspective view showing an external configuration of a conventional rotor. FIG. 12 is a view showing a configuration of a conventional dustproof washer. [Description of Signs] 1 frame, 3 brackets, 6 stators, 7 rotors, 8 rotating shafts, 10 fixed fans, 11 rotating fans, 12 fan covers, 13 commutators, 14 laminated cores, 19 unbalanced members, 20 teeth Unbalanced member, 21 retaining ring, 18, 22 Dustproof washer.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Shuichi Odaka             1728 Komaeda 1, Hanazono-cho, Osato-gun, Saitama               Mitsubishi Electric Home Equipment Co., Ltd. (72) Inventor Takashi Henmi             1728 Komaeda 1, Hanazono-cho, Osato-gun, Saitama               Mitsubishi Electric Home Equipment Co., Ltd. F-term (reference) 3B006 FA01                 3H022 AA02 BA06 BA07 CA01 CA48                       DA15                 5H607 AA04 AA14 BB01 BB04 BB14                       BB26 CC01 DD03 DD17 FF04                       JJ02 JJ03 JJ07                 5H615 AA01 BB01 BB04 BB14 PP02                       SS54

Claims (1)

Claims: 1. An electric motor comprising a stator and a rotor and having a rotating shaft passing through the rotor, and a rotating fan attached to one end of the rotating shaft and rotated by the electric motor. A substantially ring-shaped unbalanced member having an asymmetric mass distribution, wherein the unbalanced member is penetrated by the rotating shaft at an appropriate position on an outer peripheral surface of the rotating shaft, and the unbalanced position of the rotor is provided. An electric blower, which is mounted in a phase opposite to that of the blower.