JP2001136780A - Control circuit for motor-driven blower and vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control circuit, for a motor-driven blower, in which abnormal sparks are not generated and which can make the motor-driven blower long-lived and to provide a vacuum cleaner. SOLUTION: A spark detection means 16, which detects sparks generated by a commutator motor 6a, is provided, and according to the output by the spark detection means 16, the commutator motor 6a is controlled. Since a sparks accompanying degradation of a brush 6d and that of a commutator 6c can be suppressed, a motor-driven blower can be made long-lived.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electric blower for controlling an electric blower comprising a fan and a commutator motor, and to a vacuum cleaner using the same.

[0002]

2. Description of the Related Art An electric blower is generally formed of a fan for blowing air and a commutator motor for rotating the fan. The input of the commutator motor is small when the load is light as shown in FIG. There is a drooping characteristic that when the load decreases, the input speed increases and the rotation speed decreases when the load is heavy. As a method of controlling the output of the commutator motor, a method of controlling supplied power by phase control is generally adopted.

The vacuum cleaner uses a drooping characteristic of the commutator motor to rotate a fan by the commutator motor, and collects dust by a suction force generated by the rotation of the fan. Air to be sucked is the main load for the vacuum cleaner (commutator motor), and as shown in FIG. 9B, when the air volume is small (light load), the input of the commutator motor decreases and the rotation speed increases. Conversely, when the air flow is large (heavy load), the input of the commutator motor increases and the number of rotations decreases.

Hereinafter, an example of a conventional vacuum cleaner having the above-described electric blower built therein will be described with reference to FIGS.

[0005] 1 is a vacuum cleaner main body, 2 is a hose, 3 is a hand operation unit, 4 is an extension pipe, and 5 is a suction tool. Reference numeral 6 denotes an electric blower built in the main body 1, which is generally formed of a commutator motor 6a and a fan 6b driven to rotate by the commutator motor 6a because of its high output and low cost. 7
Is control means for controlling the input of the commutator motor 6a,
Reference numeral 8 denotes a current detecting means for detecting a current flowing through the commutator motor 6a.

The main body 1 of the cleaner has a dust collecting chamber 9 as a space for storing the sucked dust, and a dust collecting chamber 10 is provided in the dust collecting chamber 9 for storing the dust. It is a bag. Further, the control means 7 determines that the dust accumulated in the dust bag 10 is full, and 11 is a full notification means for notifying that the waste is full according to the determination of the control means 7. .

The operation of the above configuration is as follows.

When the operation unit 3 is operated, the control means 7 operates the electric blower 6. When the electric blower 6 operates, a current flows through the commutator motor 6a. The current flowing through the commutator motor 6a varies depending on the amount of air flowing into the fan 6b, that is, the amount of dust collected in the dust bag 10 and the like. I do.

Therefore, the control means 7 can detect the air flow based on the current value detected by the current detection means 8. If the air volume is the air volume of the garbage full level, the control unit 7 notifies the full air notification unit 11 and the air volume further decreases,
If it is determined that the air flow required to flow into the commutator motor 6a to perform cooling is at a level that cannot be ensured, the input of the commutator motor 6a is reduced, and an operation is performed to suppress excessive heat generation of the commutator motor 6a.

[0010]

However, in the commutator motor 6a, the brush (not shown) and the commutator (not shown) are in mechanical contact with each other. Sparks may occur. When a spark is generated, the loss at the spark becomes large, and FIG.
As shown in (a), the target input and the rotation speed for the load are not output, and the vehicle is operated as if the input was low. Therefore, there has been a problem that the motor efficiency is deteriorated, the brush and the commutator are greatly deteriorated, and the life of the motor is shortened.

Further, in the case where the electric blower 6 is required to have a high output as in a recent vacuum cleaner, if the spark becomes abnormally large as described above, only an input which is lower than the set input is supplied. As a result, the output is reduced, and the number of revolutions and the current are also reduced with respect to the air flow, which is inconvenient for the user.

Further, when the spark becomes large, even if the dust in the dust collection chamber 9 is not full, it is notified that the dust collection chamber 9 is full, and the input of the commutator motor 6a is reduced and the current is also reduced. Further, there is a problem that the control means 7 controls the input of the commutator motor 6a to be reduced, and the usability is deteriorated.

[0013] The present invention solves the above-mentioned problems, and provides a control circuit for an electric blower capable of stably controlling an electric blower irrespective of the presence or absence of a spark, and a vacuum cleaner capable of displaying a full garbage display suitable for actual use. The purpose is to provide.

[0014]

In order to achieve the above object, the present invention comprises spark detecting means for detecting a spark generated from a commutator motor, and controls a commutator motor in accordance with an output from the spark detecting means. With the control, the spark caused by the deterioration of the brush and the commutator can be suppressed, so that the life of the electric blower can be extended.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION
An electric blower including a fan and a commutator motor, and a spark detection unit for detecting a spark generated by the commutator motor, wherein the commutator motor is controlled according to an output from the spark detection unit. Since the spark caused by the deterioration of the brush and the commutator can be suppressed, the life of the electric blower can be extended.

According to a second aspect of the present invention, the commutator motor is changed by changing the contact load between the commutator of the commutator motor and the brush contacting the commutator in accordance with the output of the spark detecting means. With the control, the spark can be easily reduced and the electric blower can be stably controlled.

According to a third aspect of the present invention, the phase of the power supplied to the commutator motor is controlled in accordance with the output of the spark detection means, so that the power control of the electric blower can be stably performed. .

According to a fourth aspect of the present invention, the spark detecting means is formed of a spark sensor, a commercial power supply and a high-pass filter which cuts a frequency component for phase control, and detects a noise component. In addition, the spark can be detected with high accuracy, and the electric power of the electric blower can be stably controlled.

According to a fifth aspect of the present invention, the spark detecting means includes a spark sensor, a high-pass filter that cuts off frequency components for commercial power supply and phase control, and an integrating means that integrates a noise component passing through the filter. The spark can be detected with high accuracy, and the electric power control of the electric blower can be stably performed.

According to a sixth aspect of the present invention, a noise component of a predetermined period is integrated in synchronization with a half cycle or one cycle of a commercial frequency, so that a spark can be easily detected. .

According to a seventh aspect of the present invention, the integrating means is formed by a change number integrating means for integrating the number of times of ascending and descending within a predetermined time, so that the spark can be detected easily and accurately. it can.

In the invention according to claim 8 of the present invention, the integrating means is formed by a change amount integrating means for integrating a change amount within a predetermined time, so that an abnormal spark can be easily detected.

According to the ninth aspect of the present invention, the output value of the high-pass filter is sampled as a digital signal, and the sampling speed is calculated by (the number of rotations of the commutator motor × the number of rotations)
Since the speed is higher than the value obtained by the calculation of the number of commutator pieces of the rotor / the number of poles × 2), spark can be detected reliably.

According to a tenth aspect of the present invention, the spark sensor is formed by current detecting means for detecting a current flowing through the commutator motor, and the degree of spark can be detected with high accuracy.

According to an eleventh aspect of the present invention, when the output of the spark detection means exceeds a predetermined value, the occurrence of spark is determined to be abnormal and the commutator motor is controlled. Sparks can be reduced and the life of the electric blower can be extended.

According to the twelfth aspect of the present invention, a plurality of predetermined values are set, and the degree of abnormality of the spark is determined in multiple stages, so that the accuracy of determining the abnormal spark can be further improved. .

According to a thirteenth aspect of the present invention, there is provided an air flow detecting means for detecting an air flow sucked by the electric blower, and a commutator motor is controlled in accordance with an output of the air flow detecting means and an output of the spark detecting means. It is possible to control the electric blower more optimally.

According to a fourteenth aspect of the present invention, the power supplied to the electric blower is reduced when the output of the air flow detecting means falls below a predetermined value. Can be prevented.

According to a fifteenth aspect of the present invention, one or both of the output value of the air volume detecting means and the value to be compared are changed according to the detection result of the spark detecting means. , Depending on the degree of spark generation,
More detailed control of the electric blower becomes possible.

According to a sixteenth aspect of the present invention, the air flow detecting means is formed by current detecting means for detecting a current flowing through the commutator motor, and the air flow can be detected with a simple and inexpensive configuration. become.

According to a seventeenth aspect of the present invention, there is provided a dust collecting chamber for accumulating dust to be sucked in a vacuum cleaner, and a first aspect of the present invention.
An electric vacuum cleaner having the control circuit for an electric blower according to any one of Items 1 to 16, which has no abnormal spark, has a long service life, and has stable control.

The invention according to an eighteenth aspect of the present invention is a full state determining means for determining the degree of fullness of dust in the dust collecting chamber, and a full state notifying means for notifying when the output of the full state determining means exceeds a predetermined value. This makes it possible to provide a full notification with less influence of sparks, and to further prevent the vacuum cleaner from being operated while dust is abnormally accumulated in the dust collection chamber.

According to a nineteenth aspect of the present invention, the full state judging means is formed by current detecting means for detecting a current flowing through the commutator motor, and when an abnormal spark is detected, the output of the full state judging means is output. , One or both of the predetermined values to be compared are changed, and the accuracy of the fullness determination is improved.

[0034]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described.
This will be described with reference to FIGS.

FIG. 1 is a block diagram of a control circuit for an electric blower according to this embodiment. Reference numeral 15 denotes a commercial power supply, 6 denotes an electric blower including a fan 6b and a commutator motor 6a, and 16 denotes a spark detecting means. It is formed by a current sensor that detects a current flowing through the motor 6a.

Reference numeral 17 denotes a high-pass filter for removing the commercial power supply frequency or the phase control frequency from the output of the spark detecting means 16, and reference numeral 18 denotes a change number integration for recording the output of the high-pass filter 17 in terms of the frequency of rise and fall within a predetermined time. Means 19 is a spark abnormality judging means for judging that an abnormal spark has occurred when the result of the change number accumulating means 18 is repeated at a rate exceeding a certain number. 20
Is a load setting means for instructing the actuator 21 to change the contact load between the commutator 6c of the commutator motor 6a and the brush 6d when it is determined that the spark is abnormal.

FIG. 2 is a waveform diagram showing the detection contents and timing of each part when a spark occurs. FIG. 2 (a) is a waveform diagram of a current flowing through the commutator motor 6a detected by the spark detection means 16, and FIG. 2) is an output waveform diagram of the high-pass filter 17, and FIG. 2C is a change diagram of an integrated value for integrating the rising and falling frequencies of the output of the high-pass filter 17, and FIG.
FIG. 5 is a diagram showing the operation of spark abnormality determination means.

FIGS. 3A and 3B show the operation when a spark is generated. FIG. 3A is a correlation diagram between the input and the load, and FIG. 3B is a diagram showing the relationship between the spark and the pressing force of the actuator 21.

The operation of the above configuration is as follows.

First, when the commutator motor 6a is not driven, no spark is generated. Therefore, the spark abnormality judging means 19 judges that it is normal and the load setting means 20
Sets the contact load of the commutator 6c to the actuator 21 in the normal state.

In this state, the commutator motor 6a is driven.
While no spark is generated from the commutator motor 6a,
As shown by the broken line in FIG. 2A, the waveform detected by the spark detecting means 16 detects a waveform that does not include a high-frequency component in a frequency component obtained by controlling the phase of the commercial power supply 15. When this waveform is passed through a high-pass filter 17 to remove the commercial frequency and phase control frequency components, the value becomes zero as indicated by the broken line in FIG. 2B. Since this zero value has not risen or fallen, the integral value remains zero and the actuator 2
The contact load of No. 1 remains at a normal value as shown in FIG.

However, when a spark is generated, the waveform detected by the spark detecting means 16 detects a waveform containing a high-frequency component in a frequency component obtained by controlling the phase of the commercial power supply 15 as shown by a solid line in FIG.

Since the high frequency component to be detected has a sufficiently small value compared with the main power supply 15 and the phase control waveform component, which are the main waveforms, the frequency component by the power supply frequency and the phase control is reduced as shown in FIG. It is removed by the high-pass filter 17. This high-frequency component is generated by the degree of contact between the brush 6d and the commutator 6c, and is determined by the manner in which the brush 6d and the commutator 6c contact.

For example, when the distance between the brush 6d and the commutator 6c increases, a spark occurs between them. Therefore, in order to suppress the spark, as shown in FIG. 3B, the brush 6d and the commutator 6c are changed according to the degree of occurrence of the spark.
That is, it is only necessary to change the contact pressure with the contact.

When no spark is generated, the brush 6d and the commutator 6c are in normal contact with each other. When the spark is generated, the brush 6d is brought into contact with the commutator 6c. And the commutator 6c are far apart, so that the actuator 2
Increase the load of No. 1 so that the contact is normal.

As described above, by changing the contact load of the actuator 21 and keeping the brush 6d and the commutator 6c in contact with each other at a normal value, the input value to the load as shown in FIG. The solid line can be returned to the broken line.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 4, reference numeral 22 denotes current detecting means for detecting a current flowing through the commutator motor 6a and outputting the voltage at a voltage level. The current detecting means 22 detects an air flow, and the commutator motor for detecting a spark. It performs the second function of monitoring the current flowing through 6a. Reference numeral 23 denotes a spark detection unit that extracts a noise component from the output of the current detection unit 22 and determines spark in two stages from the noise component. Reference numeral 24 denotes air volume information input from the current detection unit 22 and a spark detection unit. This is control means for controlling the input of the commutator motor 6a according to the stage input from 23.

Reference numeral 25 denotes a display element such as an LED,
This is a full notification unit that notifies the dust collection bag 10 of full dust.

The operation of the above configuration is as follows.

As shown by the solid line in FIG. 5, the control means 24 controls the commutator when the air volume is reduced so that the dust is efficiently sucked in even when the air volume is changed due to the accumulation of the dust in the dust collecting bag 10. By increasing the input of the motor 6a, a predetermined air volume Q
When the air flow decreases to 3, control is performed to gradually reduce the input to W1 and W2 in order to suppress excessive heat generation by the commutator motor 6a.

Further, the control means 24 includes the current detecting means 22
When the air volume information input from the device reaches Q1, the dust bag 1
When it is determined that the amount of dust is excessively reduced to zero and the air volume is decreasing, first, the full notification unit 25 is blinked as a notice of the fullness of the dust, and when the air volume is reduced to the air volume Q2, it is switched to lighting to notify that the air is full.

However, when a spark occurs in the commutator motor 6a, the input of the commutator motor 6a decreases.
When the air volume also decreases and the air volume information input from the current detection unit 22 to the control unit 24 reaches Q2, the dust collection bag 10
Even though the garbage is not full, the full notification unit 25 is turned on, and when it reaches Q3, the input of the commutator motor 6a is reduced, so that the suction force is weakened and the cleaning is easy to use. It gets worse.

FIG. 6A shows an output waveform of the current detecting means 22 when no spark is generated, and FIG. 6B shows an output waveform of the current detecting means 22 when a spark is generated. When a spark occurs, the noise component is superimposed,
This is similarly superimposed even if the level of the current flowing through the commutator motor 6a changes due to a change in the air volume.

The spark detecting means 23 starts at a predetermined timing T1 from the zero cross of the commercial power supply voltage shown in FIG.
The output of the current detection means 22 is sampled at a predetermined cycle, and the voltage sampled last time is compared with the voltage level sampled this time. For example, as shown in FIG. The change is v1> v2
>...>v7> v8, it is determined that no spark has occurred in the commutator motor 6a,
On the other hand, as shown in FIG.
In the case of discontinuity such as 1 <v2, v2> v3,..., It is determined that a spark has occurred.

Further, when the magnitude relation is broken, the number of times of breaking is counted, and if less than the predetermined number, the stage is set to 0 (no spark occurrence), and if it is more than the predetermined number, the stage is set to 1 ( Is output to the control means 24. Further, the number of steps can be increased by increasing the predetermined number of times.

If the stage from the spark detecting means 23 is 0 (no spark), the control means 24 controls the input of the commutator motor 6a with the characteristic shown by the solid line in FIG. 5 is turned on and off when the air volume reaches Q1 and Q2, and if 1 (spark is present), the characteristic without spark is shifted to the low air volume side with the characteristic shown by the dotted line in FIG. By controlling the input of the commutator motor 6a and controlling the full notifying means 25 to turn on and blink when the air volume reaches Q11 and Q12, the commutator motor 6 can be controlled even when a spark occurs.
The operation can be switched with the air flow corresponding to the input of a, and the usability can be maintained.

It goes without saying that more detailed control can be performed by increasing the number of stages as described above.

In the present embodiment, the input of the commutator motor 6a is controlled as a load. However, similar effects can be obtained by performing control such as changing the operation point of the display element or the notifying means. Needless to say.

(Embodiment 3) Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. In FIG. 7, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 7, reference numeral 15 denotes a commercial power supply, 16 denotes a spark detection means, and a current for detecting a current flowing through the commutator motor 6a. It is formed by sensors.

26 is a high-pass filter for removing the commercial power frequency or the phase control frequency from the output of the spark detecting means 16, 27 is a rotating number detecting means for detecting the number of rotations of the commutator motor 6a, and 28 is the rotating number detecting means. 2
Speed setting means for setting the sampling rate by multiplying the detected value of 7 by the number of pieces of the commutator 6c and further dividing the value by the number of poles by 2; 29 is the high-pass filter according to the sampling rate set by the speed setting means 28; A / D conversion means for detecting the output of 26 as a digital value;
Integrating means 31 for integrating the / D detection result, a phase control means for inputting the integration result and the phase control value determined by the external setting means 32 and setting a phase value for controlling the commutator motor 6a, 33 Is driving means for driving the commutator motor 6a in accordance with the phase control amount.

FIG. 8 is a waveform diagram showing the detection contents and timing of each part when a spark occurs. FIG. 8 (a) is a waveform diagram of a current flowing through the commutator motor 6a detected by the spark detection means 16, and FIG. 8) is an output waveform diagram of the high-pass filter 26, and FIG.
A timing chart of sampling detected by the conversion means 29,
FIG. 8D is a change diagram of an integrated value for integrating the detection value of the A / D converter 29.

The operation of the above configuration is as follows.

First, the user determines the amount of phase control from the external setting means 32. At this time, since the commutator motor 6a has not been driven yet, no spark has occurred. Accordingly, the integration result of the integrating means 30 is zero, and the commutator motor 6a is driven via the driving means 33 at the phase set by the external setting means 32.

While no spark is generated from the commutator motor 6a, the detected waveform of the spark detecting means 16 is shown in FIG.
As shown by the broken line in (a), a waveform that does not include a high-frequency component in the frequency component obtained by phase-controlling the commercial power supply 15 is detected. When the commercial frequency and the phase control frequency component are removed by passing this waveform through the high-pass filter 26, the value becomes zero as shown by the broken line in FIG. 8B. A / D
After the digital conversion by the conversion means 29, the value becomes zero even when integrated by the integration means 30, and the control is continued with the phase value set by the external setting means 32.

However, when a spark occurs, the waveform detected by the spark detecting means 16 detects a waveform including a high frequency component in a frequency component obtained by controlling the phase of the commercial power supply 15 as shown by a solid line in FIG. Since the high-frequency component which is the waveform to be detected is sufficiently smaller than the main power source 15 or the phase control waveform component which is the main waveform, as shown in FIG. It is removed by the high-pass filter 26. This high-frequency component is generated by the contact between the brush 6d and the commutator 6c, and is the time interval between the contact of the brush 6d and the commutator 6c.

For example, in the case of a two-pole commutator motor 6a, the frequency of the high-frequency component is obtained by multiplying the number of rotations of the commutator motor 6a by the number of commutator pieces and dividing the result by 2 (two poles). As is apparent from this, in order to reliably detect a high-frequency component as a digital signal, it is sufficient to perform sampling at a frequency twice or more the above frequency as shown in FIG. 8C.

Therefore, the rotational speed detecting means 27 detects the rotational speed of the commutator motor 6a, and divides the preset number of commutator pieces and the number of stations by 2 by the speed setting means 2.
The output value of the high-pass filter 26 is converted into a digital signal by the A / D converter 29 at this sampling rate. The digital value is integrated to determine the spark amount.

At this time, as one method for more accurately detecting the high frequency component, as shown in FIG. 8D, a positive detection value and a negative detection value during a predetermined period of a half cycle of the power supply frequency are calculated. There is also a method of clarifying the value by adding each and adding a small amount and accumulating them, and judging the spark amount from the value. The input (output) of the commutator motor 6a
The phase control amount is set from the spark amount and the value set by the external setting means 32 so that the phase control amount is equal to that when no spark is generated, and the commutator motor 6a is driven.

If the electric blower 6 is mounted on a vacuum cleaner, even if a spark is generated in the commutator motor 6a, the phase control amount can be controlled in accordance with the spark amount by mounting the drive circuit for the commutator motor 6a. , And the electric blower control can always be performed at the optimum value regardless of the motor spark.

[0071]

According to the first aspect of the present invention,
An electric blower including a fan and a commutator motor, and a spark detection unit for detecting a spark generated by the commutator motor, wherein the commutator motor is controlled according to an output from the spark detection unit. Since the spark caused by the deterioration of the brush and the commutator can be suppressed, the life of the electric blower can be extended.

According to the second aspect of the present invention, the contact load between the commutator of the commutator motor and the brush contacting the commutator is changed according to the output of the spark detection means. Since the motor is controlled, the spark can be easily reduced and the electric blower can be controlled stably.

According to the third aspect of the present invention, the phase of the power supplied to the commutator motor is controlled in accordance with the output of the spark detection means, so that the power control of the electric blower is stabilized. Can be done.

According to the invention described in claim 4 of the present invention, the spark detecting means is formed by a spark sensor, a commercial power supply and a high-pass filter which cuts frequency components for phase control, and detects a noise component. Therefore, the spark can be detected with high accuracy, and the electric power control of the electric blower can be stably performed.

According to the invention of claim 5 of the present invention, the spark detecting means integrates a spark sensor, a high-pass filter that cuts off frequency components for commercial power supply and phase control, and a noise component that has passed through the filter. Since the spark is formed by the integrating means, the spark can be detected with high accuracy, and the electric power control of the electric blower can be stably performed.

According to the sixth aspect of the present invention, the noise component in a predetermined period is integrated in synchronization with a half cycle or one cycle of the commercial frequency, so that the spark can be easily detected. Can be.

According to the invention of claim 7 of the present invention, the integrating means is formed by the number-of-changes integrating means for integrating the number of times of ascending and descending within a predetermined time, so that the spark can be detected easily and Can be done with high accuracy.

According to the eighth aspect of the present invention, since the integrating means is formed by the change amount integrating means for integrating the change amount within a predetermined time, the abnormal spark can be easily detected.

According to the ninth aspect of the present invention, the output value of the high-pass filter is sampled as a digital signal, and the sampling speed is calculated as (rotation speed of commutator motor × number of commutator pieces of rotor / number of poles). The speed is faster than the value obtained by the calculation of × 2), and the spark can be reliably detected.

According to the tenth aspect of the present invention,
Since the spark sensor is formed by current detection means for detecting a current flowing through the commutator motor, the degree of spark can be detected with high accuracy.

According to the eleventh aspect of the present invention,
When the output of the spark detection means exceeds a predetermined value, the occurrence of spark is determined to be abnormal, and the commutator motor is controlled. This reduces abnormal sparks and extends the life of the electric blower.

According to the twelfth aspect of the present invention,
A plurality of predetermined values are set, and the degree of abnormality of the spark is determined in multiple stages, so that the accuracy of determining the abnormal spark can be further improved.

According to the thirteenth aspect of the present invention,
The air blower is provided with air flow detecting means for detecting the air flow sucked by the electric blower, and the commutator motor is controlled in accordance with the output of the air flow detecting means and the output of the spark detecting means. Control becomes possible.

According to the fourteenth aspect of the present invention,
When the output of the air volume detection means falls below a predetermined value, the power supplied to the electric blower is reduced, so that an abnormal rise in temperature of the electric blower due to a decrease in the air volume can be prevented.

According to the fifteenth aspect of the present invention,
According to the detection result of the spark detection means, the output value of the air volume detection means, one of the values to be compared, or both values are changed, according to the degree of spark generation, more fine electric blower Control becomes possible.

According to the sixteenth aspect of the present invention,
The air flow detecting means is formed by a current detecting means for detecting a current flowing through the commutator motor, so that the air flow can be detected with a simple and inexpensive configuration.

According to the seventeenth aspect of the present invention,
An electric vacuum cleaner comprising a dust collection chamber for accumulating dust to be sucked and a control circuit for an electric blower according to any one of claims 1 to 16, which has no abnormal spark, has a long service life, and has a long life. It is possible to provide a stable vacuum cleaner.

According to the eighteenth aspect of the present invention,
Full judgment means for judging the degree of dust in the dust collection chamber;
It is provided with full notification means for notifying when the output of the full determination means exceeds a predetermined value, enabling full notification with less influence of sparks, and furthermore, abnormal accumulation of dust in the dust collection chamber. It is possible to prevent the vacuum cleaner from being operated as it is.

According to the nineteenth aspect of the present invention,
The fullness judging means is formed by current detecting means for detecting a current flowing through the commutator motor, and when an abnormal spark is detected, the output of the fullness judging means and one or both of the predetermined values to be compared are determined. The change is made, and the accuracy of the full judgment is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit for an electric blower according to a first embodiment of the present invention.

2A is a waveform diagram detected by a spark detection means of the electric blower control circuit; FIG. 2B is an output waveform diagram of a high-pass filter of the electric blower control circuit; FIG. (D) Diagram showing the operation of the spark abnormality determination means of the control circuit for the electric blower

FIG. 3A is a diagram showing a relationship between an input and a load of the electric blower connected to the electric blower control circuit, and FIG. 3B is a diagram showing a relationship between a pressing force of an actuator and a spark of the electric blower control circuit.

FIG. 4 is a block diagram of a control circuit for an electric blower according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between an input indicating the operation of the control circuit for the electric blower and a flow rate;

FIG. 6A is a waveform diagram of a commercial power supply applied to the electric blower control circuit. FIG. 6B is an output waveform diagram of a current detection unit of the electric blower control circuit (when there is no spark). Output waveform diagram (with spark)

FIG. 7 is a block diagram of a control circuit for an electric blower according to a third embodiment of the present invention.

FIG. 8A is a waveform diagram detected by spark detection means of the control circuit for the electric blower; FIG. 8B is an output waveform diagram of a high-pass filter of the control circuit for the electric blower; (D) A diagram showing a change in the integral value with respect to time of the integrating means of the control circuit for the electric blower.

9A is a diagram showing load characteristics of a conventional commutator motor, and FIG. 9B is a diagram showing the relationship between the air volume and the input of a vacuum cleaner incorporating the commutator motor.

FIG. 10 is an overall perspective view of the vacuum cleaner.

FIG. 11 is a block diagram of a control circuit for the electric blower mounted on the vacuum cleaner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 2 Hose 3 Hand operation part 4 Extension tube 5 Suction tool 6 Electric blower 6a Commutator motor 6b Fan 6c Commutator 6d Brush 7, 24 Control means 8, 22 Current detection means 9 Dust collection chamber 10 Dust collection bag 11 Full notification means 15 Commercial power supply 16, 23 Spark detection means 17 High pass filter 18 Change number accumulating means 19 Spark abnormality determination means 20 Load setting means 21 Actuator 25 Full notification means 26 High pass filter 27 Revolution detection means 28 Speed setting means 29 A / D conversion means 30 integration means 31 phase control means 32 external setting means 33 driving means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 13/00 H02K 13/00 X 23/66 23/66 A 27/00 27/00 (72) Inventor Hidetoshi Imai 1006 Kadoma, Kazuma, Kazuma, Osaka Prefecture, Japan Matsushita Electric Industrial Co., Ltd. (72) Inventor Masaki Takahashi 1006, Kazuma, Kazuma, Kazuma, Osaka Pref. 1006 Kadoma Matsushita Electric Industrial Co., Ltd. (72) Inventor Hiroyuki Senoo 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshitaka Hayami 1006 Kadoma Kadoma, Osaka Pref. In-house F term (reference) 3B057 DA06 DA08 3H021 AA01 BA11 BA20 BA21 CA00 CA03 CA07 DA02 DA04 DA06 EA07 EA08 EA09 EA19 EA20 5H570 AA12 BB12 CC06 DD05 DD06 HA0 6 HB02 HB11 JJ22 JJ26 LL02 LL23 LL24 LL33 MM01 MM10 5H613 AA04 BB04 BB14 GA04 GA10 GA16 QQ06 RR02 SS01 5H623 AA01 AA03 JJ08

Claims (19)

[Claims] An electric blower comprising a fan and a commutator motor, and a spark detector for detecting a spark generated by the commutator motor, wherein the commutator motor is controlled in accordance with an output from the spark detector. Control circuit for electric blower. 2. The commutator motor is controlled by changing a contact load between a commutator of the commutator motor and a brush contacting the commutator in accordance with an output of the spark detection means. Control circuit for electric blower. 3. The control circuit for an electric blower according to claim 1, wherein the phase of the power supplied to the commutator motor is controlled in accordance with the output of the spark detection means. 4. The spark detecting means according to claim 1, wherein said spark detecting means is formed by a spark sensor, a commercial power supply and a high-pass filter which cuts a frequency component of phase control, and detects a noise component. Control circuit for electric blower. 5. The spark detecting means according to claim 1, wherein said spark detecting means comprises a spark sensor, a high-pass filter which cuts off frequency components for commercial power supply and phase control, and an integrating means for integrating a noise component passed through said filter. The control circuit for an electric blower according to claim 1. 6. The control circuit for an electric blower according to claim 5, wherein a noise component for a predetermined period is integrated in synchronization with a half cycle or one cycle of a commercial frequency. 7. The control circuit for an electric blower according to claim 5, wherein the integrating means is formed by a change number integrating means for integrating the number of times of ascending and descending within a predetermined time. 8. The control circuit for an electric blower according to claim 5, wherein the integrating means is formed by a change amount integrating means for integrating a change amount within a predetermined time. 9. The output value of the high-pass filter is sampled as a digital signal, and the sampling speed is calculated by the following equation:
4. A speed higher than a value obtained by the calculation of 2).
9. The control circuit for an electric blower according to claim 8. 10. The spark sensor is formed by current detecting means for detecting a current flowing through a commutator motor.
The control circuit for an electric blower according to claim 1. 11. The electric motor according to claim 4, wherein when the output of the spark detection means exceeds a predetermined value, occurrence of spark is determined to be abnormal and the commutator motor is controlled. Control circuit for blower. 12. The control circuit for an electric blower according to claim 11, wherein a plurality of predetermined values are set, and the degree of spark abnormality is determined in multiple stages. 13. A commutator motor according to claim 1, further comprising an air flow detecting means for detecting an air flow sucked by said electric blower, wherein said commutator motor is controlled according to an output of said air flow detecting means and an output of said spark detecting means. The control circuit for an electric blower according to any one of claims 12 to 12. 14. The control circuit for an electric blower according to claim 13, wherein the power supplied to the electric blower is reduced when the output of the air flow detecting means falls below a predetermined value. 15. The control circuit for an electric blower according to claim 14, wherein one or both of the output value of the air volume detection means and the value to be compared are changed according to the detection result of the spark detection means. 16. The air flow detecting means is formed by current detecting means for detecting a current flowing through a commutator motor.
16. The control circuit for an electric blower according to any one of claims 15 to 15. 17. A dust collecting chamber for accumulating dust to be sucked,
An electric vacuum cleaner comprising the control circuit for an electric blower according to claim 1. 18. A device according to claim 17, further comprising: a full judgment unit for judging the degree of dust in the dust collection chamber, and a full notification unit for notifying when the output of the full judgment unit exceeds a predetermined value.
Vacuum cleaner as described. 19. A full state judging means is formed by current detecting means for detecting a current flowing through a commutator motor, and when an abnormal spark is detected, one of an output of the full state judging means and a predetermined value to be compared, 19. The vacuum cleaner according to claim 17, wherein both values are changed.