JPH0865956A - Balance correcting method for motor driven blower and balance measuring apparatus for rotor - Google Patents

Abstract

PURPOSE: To provide a method for correcting the balance of a motor driven blower which can conduct the combination balance correction after the blower is assembled and a balance measuring apparatus for a rotor. CONSTITUTION: An unbalance position detecting groove 21 is provided on the end face of a rotary shaft fixedly mounted with a rotor 4 and a centrifugal impeller, and the unbalance position of the rotor 4 and the impeller is detected by acceleration pick-up sensors 28, 29 mounted on the outer periphery of the blower 1 by using an optical sensor 22. Thus, the unbalance of the impeller is so corrected that the phases of the unbalance position of the rotor 4 and the unbalance position of the impeller become substantially the same phase. Thus, the combination balance correction after the blower is assembled is facilitated. Even at the high speed rotation, low vibration and low noise operation is performed, the balance accuracy of a commutator can be improved, stable commutation is obtained, and the reliability of a commutator motor can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting the balance of an electric blower composed of a commutator motor and an impeller, and a balance measuring device for a rotating body, and in particular, a combination for maintaining stable performance. The present invention relates to a balance correction method and a balance measuring device for a rotating body.

[0002]

2. Description of the Related Art Conventionally, as a method of correcting a combination balance of a motor, as described in JP-A-60-122300, rotation is performed before an air guide having a bearing holding portion which also serves as an end bracket is incorporated. A structure is introduced in which the centrifugal impeller is fixed to the child and the balance is corrected in the state where these are integrated. In addition, JP-A-2-23
As described in Japanese Patent Laid-Open No. 1947, there is introduced a device in which the entire motor is installed in a balance adjusting device, the rotor part is rotated, and a balance adjusting member is attached to the rotor part to adjust the rotational balance.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In 0-122300, the rotor and the centrifugal impeller are integrated to correct the balance, but the combination balance is greatly affected by the unbalance amount of the rotary shaft itself. The shaft center accuracy of the bearing when incorporated as a motor also affects. Therefore, the balance of the rotating part itself can be corrected, but the balance cannot be corrected in the final assembled state of the motor, that is, in the state where the bearing is held, and the balance accuracy after assembly may be deteriorated. In addition, there is no description about the detection of the unbalance position when actually performing the combined balance correction, the positioning of the unbalance correction portion, the fixing method, etc.
It was a big problem before it was realized.

Further, in Japanese Patent Application Laid-Open No. 2-231947, the entire assembled motor is installed in a balance adjusting device, and the unbalanced portion of the motor is detected through the balance adjusting device. There is a problem that the detection accuracy varies depending on the method.

An object of the present invention is to realize a concrete balance correction method when performing combination balance correction, to improve the combination balance accuracy for high speed rotation,
Balance correction method for electric blowers and balance measurement of rotating body that performs combination balance correction necessary to reduce vibration and noise, stabilize carbon brush sliding, and prevent performance deterioration and carbon brush wear increase To provide a device.

[0006]

In order to achieve the above object, the present invention detects an unbalanced position of a rotor and an impeller mounted and fixed to a rotary shaft of a commutator motor provided in an electric blower. In the balance correction method for an electric blower that performs balance correction, the rotor and the impeller are combined, the unbalanced positions of the rotor and the impeller are detected, and the unbalanced position of the rotor and the impeller are detected. The unbalance correction of the impeller is performed so that the phases of the unbalance positions of 1 are substantially in phase.

[0007]

According to the present invention, the unbalanced positions of the rotor and the impeller fixed to the rotary shaft of the commutator motor are detected while the rotor and the impeller are installed in the electric blower. The phase of each unbalanced position (deviation as a rotation angle) is measured. The phase of the measured unbalance position is regarded as the unbalance correction angle, and the impeller is rotated with respect to the rotation axis of the commutator motor so that this unbalance correction angle is almost in phase (eliminating the deviation of the rotation angle). Let Thus, the impeller can be rotated with respect to the rotation shaft in a state where the rotor and the impeller are incorporated in the electric blower, so that the imbalance can be easily corrected.

The unbalanced position of the rotor and the unbalanced position of the impeller can be detected by installing an acceleration pickup sensor on the outer peripheral portion of the motor, and the unbalanced position is measured by an optical reflection diode or the like. A rectangular wave serving as a reference is formed from a groove for detecting an unbalanced position provided on the end surface of the rotation shaft of the rotor using a linear sensor, and the vibration sound from the acceleration pickup sensor is processed and measured based on the rectangular wave. Is possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A balance correction method for an electric blower according to an embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 1 shows an example applied to an electric blower used in an electric vacuum cleaner. The electric blower 1 includes an electric motor unit 2 and a blower unit 3.

The electric motor section 2 is a commutator type electric motor, and includes a rotor 4 and a stator 5 in a housing 6 and an end bracket 7.
Is stored. The rotor 4 is supported by bearings 13 and 14, and the rotating shaft 15 extends through the end bracket 7 toward the blower unit 3 side.

In the blower unit 3, a fixed guide vane 8 is arranged on an end bracket 7, and an impeller (hereinafter referred to as a centrifugal impeller) 9 is integrally fixed to a rotating shaft 15 by a screw 16. Further, the casing 10 is press-fitted and fixed to the outer periphery of the end bracket 7 so as to cover them, and the fixed guide blade 8
Is pinched and fixed.

In the rotor 4, a balance ring 17, a commutator 18 and an iron core 19 are arranged and fixed between the bearings 13 and 14 at both ends, and a winding 20 is wound around the iron core 19 to form a commutator 18.
Is electrically connected to the outer peripheral portion of. Balance ring 17
Is for balancing the rotor 4 itself.

The carbon brush 12 housed in the brush holder 11 which is screwed and fixed on the outer peripheral surface of the housing 6 is urged by a spring or the like in the brush holder 11 to form an outer periphery of the commutator 18. It abuts the surface and is electrically connected. The rotor 4 and the centrifugal impeller 9 are unbalanced due to dimensional variations in manufacturing, but can be controlled to a predetermined value or less by a balance corrector or the like. FIGS. 2A and 2B show the measurement results after the balance correction of the centrifugal impeller 9 and the balance correction of the rotor 4.

However, when assembled into the electric blower 1, due to the fitting gap between the rotary shaft 15 and the inner diameter of the centrifugal impeller 9 and the difference in the vector sum of the unbalances when combined, (c). As shown in, the combined imbalance amount becomes larger than the above individually controlled values, and a large amount causes vibration noise and lower reliability. Therefore, it is necessary to correct the combination balance after the electric blower 1 is assembled. After the electric blower 1 is assembled as shown in FIG. 1, when the electric motor section 2 is energized, the centrifugal impeller 9 rotates together with the rotor 4. At this time, the above-mentioned combined imbalance is measured and corrected. A specific measuring method will be described below.

First, as shown in FIG. 3, an unbalanced position detecting groove 21 is provided on the end face of the rotary shaft 15, and the rotary shaft 15 is rotated by the reflected light from the optical sensor (for example, photodiode) 22. Position detection waveforms 23 and 24 as shown in FIG. 5 are obtained. When the rotating shaft 15 rotates and the unbalanced position detecting groove 21 passes through the reflected light portion of the photodiode 22, the output waveform of the photodiode 22 is detected at a high level as indicated by 23 in FIG. The output waveform after passing through the balance position detection groove 21 is 24
The low level detection is performed as shown in.

The sine waveform 25 in FIG. 5 detects the vibration of the rotor 4 transmitted to the housing 6 by the acceleration pickup sensor 28, which is attracted by the magnet 27 on the outer peripheral surface of the housing 6 in FIG. The waveform of the rotation primary component detected through FIG. Similarly, the sine waveform 26 is a waveform of the rotation primary component detected by the filter by detecting the vibration of the centrifugal impeller 9 transmitted to the casing 10 by the acceleration pickup sensor 29 adsorbed on the outer peripheral surface of the casing 10. The maximum amplitude points A and B are the unbalance correction positions of the rotor 4 and the centrifugal impeller 9, respectively.

As described above, the respective unbalance correction positions detected are the periods Ta and T from the position detection waveform 23.
b can be obtained and calculated to obtain the unbalance correction angle. From the obtained unbalance correction angle, the centrifugal impeller 9 is rotated with respect to the rotating shaft 15 so that the unbalance correction position of the centrifugal impeller 9 is substantially in phase with the unbalance correction position of the rotor 4. It is possible to reduce the deflection of the commutator 18. Further, instead of rotating the centrifugal impeller 9, the unbalanced position of the centrifugal impeller 9 is drilled,
The balance may be corrected by cutting with a cutter or a correction method such as a load application method.

Next, a description will be given of how the runout of the commutator 18 fixed to the rotor 4 can be reduced by making the unbalance correction positions of the rotor 4 and the centrifugal impeller 9 substantially in phase. As shown in FIG. 6, the displacement mode of the rotor 4 becomes the displacement mode 30 shown by the dotted line due to the unbalanced direction A remaining in the iron core 19. Therefore, when there is a residual imbalance in the B direction of the centrifugal impeller 9, a force acts in the A direction in the displacement mode of the rotor 4,
As the residual unbalance amount of the centrifugal impeller 9 increases,
The displacement mode of the rotor 4 also bends in the A direction. On the contrary, the displacement mode of the rotor 4 when there is a residual imbalance in the C direction of the centrifugal impeller 9 is a force that is suppressed and becomes straight like the displacement mode 31 shown by the solid line. The swing of the commutator 18 also becomes small.

FIG. 7 shows a case where the rotor 4 is rotating due to the phase difference between the unbalanced position remaining on the iron core 19 of the rotor 4 and the unbalanced position remaining on the centrifugal impeller 9. It shows how the amount of deflection of the commutator 18 changes. If the phase difference is within the target range of ± 10 °,
The amount of deflection of the commutator 18 is suppressed to 6 μm or less, ± 30 °
Within the allowable range of, the shake amount is within 10 μm.

FIG. 8 shows the imbalance position remaining on the iron core 19 of the rotor 4 and the imbalance position deviation of the centrifugal impeller 9. The unbalanced position deviation of the centrifugal impeller 9 with respect to the unbalanced position of the rotor 4 is a rotation angle of ± 10 °.
If it is within the target range of, the vibration amount of the commutator 18 is at a level that does not pose a problem, and if it is within the allowable range of ± 30 ° in the rotation angle, the vibration amount of the commutator 18 can be suppressed, and The effect on the carbon brush 12 is small, and the life of the carbon brush 12 can be extended.

FIG. 9 shows the relationship between the residual unbalance amount of the centrifugal impeller 9 and the runout of the commutator 18 fixed to the rotor 4. The unbalanced position of the rotor 4 and the centrifugal impeller 9 are shown. When the unbalanced position of is in the opposite phase,
The deflection of the commutator 18 increases as the unbalance amount of the centrifugal impeller 9 increases. Further, when the unbalanced position of the rotor 4 and the unbalanced position of the centrifugal impeller 9 are substantially in phase, the shake of the commutator 18 is suppressed and reduced.

From the above, by setting the unbalanced position of the centrifugal impeller 9 in substantially the same phase as the unbalanced position of the rotor 4, the runout of the commutator 18 can be suppressed and the combined unbalance can be corrected. Further, in the present embodiment, the balance ring 17 is used to balance the rotor 4 itself, but since the imbalance is corrected by using the method of the present embodiment, the balance ring 17 becomes unnecessary. . As a result, the axial direction of the electric blower can be shortened, and the electric blower can be downsized.

[0024]

According to the present invention, the imbalance positions of the impeller and the rotor are substantially in phase, so that the combined balance can be easily corrected after the electric blower is assembled. Also, it is not necessary to strictly correct and manage the amount of impeller imbalance.

Further, the combination balance correction enables low vibration and low noise operation even at high speed rotation.
Particularly, since the balance accuracy of the commutator portion can be improved, the rotation accuracy of the commutator is stabilized, the life of the carbon brush is extended, and the reliability of the motor can be further improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an electric blower according to an embodiment of the present invention.

FIG. 2 is a diagram showing a comparison of an unbalance amount before and after assembling an electric blower.

3 is a perspective view showing an unbalance correction position detection method for the electric blower of FIG. 1. FIG.

FIG. 4 is a vertical cross-sectional view of the electric blower of FIG. 1 showing an unbalance correction position detection method of the present invention.

5 is a diagram showing waveforms of vibrations of the rotor and the centrifugal impeller detected in FIG.

6 is a diagram showing a relationship between an unbalanced position and a displacement mode of a rotor of the electric blower shown in FIG.

7 is a diagram showing a relationship between an unbalanced position deviation of a centrifugal impeller and a commutator runout with respect to an unbalanced position of a rotor of the electric blower shown in FIG.

8 is a diagram showing an unbalanced position of a rotor of the electric blower of FIG. 1 and an allowable range of unbalanced position deviation of a centrifugal impeller.

9 is a diagram showing a relationship between an unbalance amount of the centrifugal impeller of the electric blower of FIG. 1 and commutator runout.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric blower, 4 ... Rotor, 6 ... Housing, 9 ... Centrifugal impeller, 15 ... Rotating shaft, 18 ... Commutator

Claims (7)

[Claims] 1. A balance correction method for an electric blower, which detects an unbalanced position of a rotor and an impeller fixed to a rotary shaft of a commutator motor provided in the electric blower to correct the balance. The rotor and the impeller are combined, the unbalanced positions of the rotor and the impeller are respectively detected, and the blades are arranged so that the unbalanced position of the rotor and the unbalanced position of the impeller are substantially in phase. A method for correcting the balance of an electric blower, which comprises correcting the unbalance of a vehicle. 2. The balance correction method for an electric blower according to claim 1, wherein the imbalance correction of the impeller is performed by rotating the impeller with respect to the rotation shaft. 3. The balance correction method for an electric blower according to claim 1, wherein the imbalance correction of the impeller is performed by cutting a part of the impeller. 4. The balance correction method for an electric blower according to claim 1, wherein the imbalance correction of the impeller is performed by applying a load to a part of the impeller. 5. The unbalanced position of the impeller is within a phase difference of substantially in-phase within ± 30 ° in a rotation angle with respect to the unbalanced position of the rotor according to any one of claims 1 to 4. A method for correcting the balance of an electric blower, characterized in that the unbalance is corrected. 6. A balance measuring device for a rotating body, wherein an engineering sensor is installed at a position corresponding to a reference position for balance measurement provided on a part of the rotating body, and the engineering sensor is provided at the reference position. Detecting means for detecting the reflected light reflected by the irradiation by irradiating and rotating the rotating body, and vibration detecting means for detecting the vibration of the rotating body based on the detection value of the detecting means, and the detected A balance measuring device for a rotating body, comprising: a calculating unit that calculates an unbalanced position of the rotating body based on vibration. 7. The balance measurement of a rotating body according to claim 6, wherein the rotating body is a rotor and an impeller mounted and fixed to a rotating shaft of a commutator motor provided in an electric blower. apparatus.