JP2003135342A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner which prevents drop in sucking power along with higher durability, a smaller size and a lighter weight. SOLUTION: An inverter device herein provided comprises a brushless motor 3, a motor control means 4 for controlling the operation of the brushless motor 3, a driver means 5 for outputting drive signals of the brushless motor 3 to the motor control means 4, and a DC power source 6 for supplying applied voltages to the brushless motor 3, which can provide a vacuum cleaner that can prevent drop in sucking power while achieving a smaller size and a less weight along with higher durability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of an electric vacuum cleaner having a dust collecting mechanism for separating dust by a cyclone action of swirling suction air.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Application Laid-Open No. 2000-342492 and Japanese Patent Application Laid-Open No. 9-253011, an electric vacuum cleaner having a cyclone dust collecting mechanism has been proposed.

In this type of electric vacuum cleaner, a commutator motor is generally adopted as an electric blower for generating a suction force.

[0004]

However, in the above vacuum cleaner, in the conventional cyclone type vacuum cleaner using such a commutator motor, the pressure loss in the cyclone dust collecting chamber is large, so that a paper bag type electric vacuum cleaner is used. There was a problem that the suction work rate was lower than that of a vacuum cleaner. Also,
In order to improve the suction work rate, it is necessary to increase the size of the electric blower, and the size and mass of the cleaner main body tend to increase accordingly.

Further, in the cyclone type vacuum cleaner, it is difficult to surely collect even fine dust at the dust collecting portion because the air flow and dust are separated by centrifugal force.
When it entered the electric blower and accumulated on the brush, it had a problem in durability as an electric blower and an electric vacuum cleaner.

The present invention solves the above problems at the same time, and an object of the present invention is to provide an electric vacuum cleaner which prevents a decrease in suction work rate and has improved durability and reduced size and weight.

[0007]

In order to achieve the above object, the present invention provides a brushless motor incorporated in an electric blower for generating suction air, a motor control means for controlling the operation of the brushless motor, and the motor control means. And an inverter device composed of a driver means for outputting a drive signal of the brushless motor and a DC power supply means for supplying an applied voltage to the brushless motor, and swirling suction air upstream of the electric blower to remove dust by a cyclone action. Equipped with a separate dust collection chamber, the sliding loss of the carbon brush of the conventional commutator motor and the copper loss of the armature winding are eliminated, improving the efficiency of the motor and the suction work of the vacuum cleaner. The decrease in the rate can be suppressed. In addition, the inverter device enables high-speed and fine control, which makes it possible to reduce the size and weight of the electric blower and to maintain suction performance for a long period of time, leading to the reduction in size and weight of the electric vacuum cleaner. Also, by using a brushless motor,
It is possible to solve the problem that fine dust that cannot be completely collected enters the electric blower and accumulates on the brush portion, and the durability of the electric blower and the electric vacuum cleaner can be improved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
A brushless motor built in an electric blower that emits suction air, a motor control unit that controls the operation of the brushless motor, a driver unit that outputs a drive signal of the brushless motor to the motor control unit, and an applied voltage to the brushless motor. A carbon brush provided in a conventional commutator motor, which is provided with an inverter device including a DC power supply means for supplying, and a dust collection chamber that separates dust by a cyclone action by swirling suction air upstream of the electric blower. The sliding loss, the copper loss in the armature winding, etc. are eliminated, the efficiency of the motor is improved, and the reduction of the suction power of the electric vacuum cleaner can be suppressed. In addition, the inverter device enables high-speed and fine control, which makes it possible to reduce the size and weight of the electric blower and to maintain suction performance for a long period of time, leading to the reduction in size and weight of the electric vacuum cleaner.
Further, since the brushless motor is used, it is possible to solve the problem that fine dust that cannot be completely collected enters the electric blower and accumulates on the brush portion, and the durability of the electric blower and the electric vacuum cleaner can be improved.

According to a second aspect of the present invention, a brushless motor built in an electric blower for generating suction air, a motor control means for controlling the operation of the brushless motor, and a drive of the brushless motor in the motor control means. An inverter device including a driver unit that outputs a signal and a DC power supply unit that supplies an applied voltage to the brushless motor, and an air volume detection unit that detects the suction air volume, and the suction air volume includes an air volume that maximizes the work rate. In a case other than the air flow rate range, the rotational speed of the brushless motor is reduced, and resonance that occurs between the motor that rotates at high speed and each component that constitutes the cleaner body can be suppressed. . In addition, it is possible to reduce power consumption in the high air volume region, to ensure the power percentage at the power percentage point, and to suppress the surging noise and the heat generation of the brushless motor due to the reduction of the cooling air in the low air volume region. .

According to the third aspect of the present invention, as the air volume detecting means, the rotational speed error detecting means for detecting the difference between the actual rotational speed of the brushless motor and the set rotational speed is used. Can be detected.

According to a fourth aspect of the present invention, there is provided dust detection means for detecting the presence or absence of sucked dust and the size of the dust and outputting a pulse corresponding to the size of the dust, and a pulse of the pulse. The pulse width measuring means for measuring the width is provided, and the driver means outputs the drive signal of the brushless motor according to the output of the pulse width measuring means, and the suction force can be controlled more finely depending on the size of the dust.

According to a fifth aspect of the present invention, an input signal processing means for processing an output signal from the dust detecting means for detecting the presence or absence of dust and its size is provided, and the input signal processing means and the driver means are provided. Is a process that uses different functional elements, and processes signals that require interrupt processing, such as output from a dust detection unit that detects the presence or absence of dust and its size, but that is input at a relatively low speed but that is interrupted. The input signal processing means and the driver means that receives the output of the input signal processing means and outputs a high-speed and continuous signal to the motor control means are processed by using different functional elements, so that the arithmetic processing is delayed. You can turn it off.

According to a sixth aspect of the present invention, an electric motor and a rotary brush which is rotated by the electric motor are built-in, and a suction portion communicating with the cyclone dust collecting chamber is provided. You can surely fried.

According to a seventh aspect of the present invention, a microswitch electrically connected in series with an electric motor is provided, and a full-wave rectified waveform obtained by full-wave rectifying an AC waveform is supplied to the electric motor and the microswitch. This reduces the electrical load on the switch contacts.

According to the eighth aspect of the present invention, power is supplied to the electric motor from the DC power supply means, and a DC motor with a low voltage specification can be used as the electric motor.

According to a ninth aspect of the present invention, the DC power source means is insulated from a power source for applying a voltage to the cleaner body, and an insulating structure is essential for the attachment from the cleaner body to the front. It is no longer a condition. Further, the noise of the electric motor will not be superimposed on the power supply.

According to a tenth aspect of the present invention, the DC power supply means is provided with a current limiter for detecting the lock of the electric motor, and the electric motor is operated a predetermined time after the electric current limiter detects the lock of the electric motor. When the electric motor is locked, the output of the DC power supply means is reduced, and the winding burn of the electric motor can be prevented.

According to an eleventh aspect of the present invention, a power supply voltage detecting means for detecting a voltage applied to the entire cleaner and outputting it to the driver means is provided, and the brushless motor of the brushless motor is output according to the output of the power supply voltage detecting means. It controls the number of rotations, so that stable cleaning performance can be obtained even if the power supply voltage changes.

According to a twelfth aspect of the present invention, a power supply current detecting means for detecting a current flowing through the entire cleaner and outputting it to the driver means is provided, and the brushless motor is rotated according to the output of the power supply current detecting means. The number is controlled, and a stable current can be applied to the brushless motor to obtain stable cleaning performance.

According to the thirteenth aspect of the present invention, the rotation speed of the brushless motor is controlled so that the output of the power supply current detection means becomes a predetermined value or less, and an abnormally high current can be prevented. .

According to a fourteenth aspect of the present invention, an inverter device is constituted by a brushless motor, a motor control means, a driver means and a DC power supply means, and a voltage applied to the inverter device is smoothed and stabilized. Since a plurality of capacitors are connected in parallel to each other and the capacitors are sequentially charged when the power is turned on or when the brushless motor is started, an abnormal inrush current does not flow.

According to a fifteenth aspect of the present invention, the capacities of a plurality of capacitors are set to be different from each other, and when the power is turned on or the brushless motor is started, the capacitor having a small capacity is charged as needed. Thus, the DC power supply means can be stabilized in a relatively short time.

According to a sixteenth aspect of the present invention, an inverter device is composed of a brushless motor, a motor control means, a driver means, and a DC power supply means, and the voltage applied to the inverter device is smoothed and stabilized. When a plurality of capacitors are connected in series and the brushless motor is started after the charging of all the capacitors is completed, at least one capacitor is short-circuited, and the charging of the capacitors can be completed in a short time.

According to a seventeenth aspect of the present invention, the capacitor to be short-circuited is changed every time the brushless motor is started, and the charging of the capacitor can be completed in a short time. The capacitors are also in the same average usage condition, and the life of all capacitors can be extended.

In the eighteenth aspect of the present invention, there is provided a high frequency sound calculating means for detecting the rotation speed of the brushless motor, and a high frequency sound calculating means for obtaining a product and a phase of the rotation speed and the number of blades of the fan. (Referred to as "Nz sound calculation means") and a sounding means arranged near the brushless motor to generate sound based on the output of the Nz sound calculation means, thereby providing a phase opposite to the Nz sound accompanying rotation of the brushless motor. By outputting the sound of the above from the sounding means, it is possible to reduce the unpleasant sound.

According to the nineteenth aspect of the present invention, since the sounding means is provided in the exhaust side passage of the brushless motor where the Nz sound is the loudest, the sound deadening effect is large.

According to a twentieth aspect of the present invention, a rotating speed detecting means for detecting the rotating speed of the brushless motor and a high frequency sound calculating means for obtaining a product and a phase of the rotating speed and the number of blades of the fan (hereinafter "Nz sound calculation means"), a valve provided in the exhaust passage of the brushless motor, and exhaust area control means for controlling the valve based on the output of the Nz sound calculation means to vary the exhaust area. Thus, it is possible to obtain a sound that does not depend on the rotation speed (Nz sound) of the brushless motor.

[0028]

EXAMPLE 1 Example 1 of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, reference numeral 1 is a power source which serves as an operating power source for the entire cleaner body 2, and here is a general household power source AC1.
00V is used. Reference numeral 3 is a brushless motor having a wide variable speed range and high motor efficiency, and is incorporated in an electric blower (not shown) which requires a wide variable speed range. Reference numeral 4 denotes a motor control means for controlling the rotation speed of the brushless motor 3, which is configured as a voltage type inverter in which a control element such as an IGBT, a power MOS, and a freewheeling diode connected in anti-parallel thereto is connected in a three-phase bridge. .
(In this embodiment, an IGBT is used.) 5 is a driver means for outputting a drive signal to the motor control means 4, and 6 is a voltage for operating the brushless motor 3 (here DC 18V). The motor control means 4, the driver means 5 and the DC power supply means 6 constitute an inverter device 7. Further, 8 is a reactor for improving the power factor, 9 is a diode bridge connected to the power source 1 through the reactor 8, 1
Reference numeral 0 is a capacitor that smoothes and stabilizes the waveform that is full-wave rectified by the diode bridge 9.

Reference numeral 11 denotes a diode, which is inserted between the diode bridge 9 and the capacitor 10 to separate the full-wave rectified waveform portion and the smoothed waveform portion. Then, on the anode (full-wave rectified waveform) side of the diode 11, a motor 13 and a microswitch 14 for driving a rotating brush (not shown) incorporated in the suction unit 12 for sucking dust on the surface to be cleaned.
Are connected in series. The electric motor 13 is built in the rotary brush.

Reference numeral 15 is a dust detecting means for detecting the presence or absence of dust and the size thereof and outputting a pulse corresponding to the size of the dust. Reference numeral 16 is a signal processing means for measuring the output pulse width of the dust detecting means. It is a pulse width measuring means for outputting to 17. Reference numeral 17 denotes an input signal processing means for inputting output signals (relatively low speed; intermittent input signal at several kHz or less but intermittent) from the dust detecting means 15 and the pulse width measuring means 16, and performing interrupt processing. The output is input to the driver means 5. Here, the driver means 5 receives the output of the signal processing means 17 and outputs a high speed and continuous signal to the motor control means 4 (generally 20 kHz).
Since a PWM signal of a certain degree is required, a microcomputer, which is a functional element independent of the input signal processing means 17, is used so that the arithmetic processing is not delayed.
In other words, the output of the pulse width measuring means 16, that is, the drive signal of the brushless motor 3 according to the size and type of dust is a signal in which the ON duty of PWM is continuously changed, and the brushless motor 3 continuously changes its rotation speed. Change.

Reference numeral 18 is a power supply voltage detecting means for detecting the voltage of the power supply 1 and outputting it to the driver means 5. Reference numeral 19 is a total current flowing through the cleaner body 2 (current flowing through the DC power supply means 6, brushless motor 3, electric motor 13). This is a power supply current detecting means for detecting (total) and outputting to the driver means 5. Also, 2
Reference numeral 0 denotes a cyclone dust collecting chamber in which suction air is swirled inside to separate dust by a cyclone action.

The operation of the above configuration is as follows.

The dust scraped up by the rotating brush driven by the electric motor 13 is guided to the cyclone dust collecting chamber 20 through the suction path 28, and the dust contained therein is detected by the dust detecting means 15 and is small. Since a relatively short pulse width is measured in the case of heavy dust and a relatively long pulse width is measured in the case of large dust, the pulse width measuring means 16 measures the high-speed rotation signal of the brushless motor 3 in the case of a small mass. In the case of a large mass, a medium speed rotation signal is output to the signal processing means 17 and to the driver means 5. (Actually, a stepless rotation signal corresponding to the pulse width is output to the driver means 5.)
In response to this, the driver means 5 outputs to the motor control means 4 a signal with a long ON duty of the PWM signal for a high speed rotation signal and a short ON duty for a medium speed rotation signal. Performs a high-speed rotation for small-mass dust, and a medium-speed rotation for large-mass dust, that is, fine control of the suction force can be performed by a wide range of speed control by the brushless motor 3, especially for small-mass dust. In this case, since the dust swirls around the outer circumference of the dust collecting material, it is possible to reduce the adsorption on the surface of the main filter portion and maintain the suction performance for a long period of time.

In the present embodiment, the input signal processing means 17 (requiring interrupt processing at a relatively low speed because it is intermittently input) and the driver means 5 (outputting a high speed and continuous signal) are used. Since they are independent functional elements, there is no particular stagnation in the arithmetic processing for generating the PWM signal in the driver means 5, and continuous control operation can be continued.

Further, the power source 1 is detected by the power source voltage detecting means 18.
Even if the voltage fluctuates, the information is input to the driver means 5, and the PWM signal is output from the driver means 5 so as to keep the rotation speed of the brushless motor 3 constant, so that stable cleaning performance can be obtained. it can.

Similarly, a stable current can be supplied to the brushless motor 3 by the power supply current detecting means 19, so that stable cleaning performance can be obtained, and a highly reliable vacuum cleaner in which abnormal high current does not flow is provided. Obtainable.
Further, the current sensor (current transformer) generally used as the power supply current detection means 19 has a power supply frequency of 50/6.
Although the frequency deviation due to 0 Hz is a problem, it does not pose a problem in the high frequency current band of the brushless motor 3, and in the case of the cyclone dust collecting structure, the current of the brushless motor 3 is hardly affected by the change in the air flow rate, so accuracy is also required. It can be constructed inexpensively.

Generally, in the cyclone dust collecting structure, the decrease in the suction force caused by the pressure loss due to the long intake path is obtained by using the suction portion with the built-in motor to obtain the dust scooping force, and thus the comprehensive cleaning performance. Will be greatly improved.

In addition, since the full-wave rectified waveform is supplied from the anode side of the diode 11 to the electric motor 13 and the microswitch 14, compared with the case where a smoothed waveform is input, the electrical load on the contacts of the microswitch is greatly increased. Can be reduced to Although the micro switch is used in this embodiment, the same can be said for electric parts such as a temperature switch.

(Embodiment 2) Next, another embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted here.

In the figure, reference numeral 21 designates a DC low voltage (DC18V in this embodiment) rated electric motor, which drives the rotary brush and is incorporated in the rotary brush. The electric motor 21 is supplied with the output voltage (DC18V) of the DC power supply means 22. Further, the DC power supply means 22 is electrically insulated from the power supply 1 by an insulation transformer 23, and has a built-in current limiter which detects lock of the electric motor 21 and operates after a predetermined time.

The operation of the above configuration is as follows.

Since the electric motor 21 is supplied with power from the DC power supply means 22, if the rotating brush is locked for some reason, the electric motor 22 driving the rotating brush is also locked. Then, after a certain period of time, the current limiter built in the DC power supply means operates and the output voltage of the DC power supply means 22 decreases, so that the power supply to the electric motor 21 is stopped, and the DC power supply means 22 is overloaded. It is possible to ensure safety such as avoiding the above and preventing winding burn of the electric motor 21.

Further, as the electric motor 21, it is possible to use an extremely wide variety of low-voltage direct current electric motors.
It is possible to reduce the size and cost of the suction section.

Further, according to this embodiment, the DC power supply means 2
Since 2 is insulated from the power source 1 by the insulating transformer 23, a non-insulated structure product such as a hose with a conductive wire can be used for the attachment from the cleaner body.
The size and material restrictions required for insulation are eliminated, and size reduction, weight reduction, and cost reduction can be achieved. In addition, there is no "superimposed noise of the DC motor on the power supply" which is a general problem, so that cost reduction and size reduction can be achieved at the same time as a countermeasure against noise.

(Embodiment 3) Next, another embodiment of the present invention will be described with reference to FIG. The same components as those of the first or second embodiment are designated by the same reference numerals and the description thereof will be omitted here.

In the figure, reference numerals 24a and 24b denote capacitors for smoothing / stabilizing the full-wave rectified waveform by the diode bridge 9. Here, a plurality of capacitors are connected in parallel. Also, these capacitors 24a
The capacitors 24a and 24b have different capacities, and when the power source 1 is turned on or a switch (not shown) for activating the brushless motor 3 is operated, the relay contacts 25a and 25b connected to the capacitors 24a and 24b are turned on. The capacitors 24a and 24b are sequentially charged by opening and sequentially closing. (In this embodiment, the capacitors having smaller capacities are sequentially charged.) The DC power supply means 6 has the capacitors 24a and 2a.
The voltage is supplied from 4b, but the rated voltage is DC18.
V can reach the operating voltage in an extremely short time,
Even if the charging of all the capacitors is not completed, the driver means 5 and the like are in an operable state, so that it is possible to shorten the time until the control circuit can be stably operated after the power is turned on, and the brushless motor 3 does not malfunction. . Moreover, unlike the case of one large-capacity capacitor, an abnormally high inrush current does not flow, so that the cleaner plug is not damaged. Further, immediately after the switch operation, the voltage of the capacitor is temporarily reduced, but basically the brushless motor 3 is started slowly, so there is practically no problem, and the charge amount is greater than the discharge amount due to the operation of the brushless motor 3. Is set so that all capacitors can finish charging during slow start. In this embodiment, the case of using two capacitors has been described, but the same applies to the case of using three or more capacitors. Further, the capacitances of the capacitors may be set to be the same, or a state in which none of the capacitors is charged may be realized by using a relay contact.

(Embodiment 4) Next, another embodiment of the present invention will be described with reference to FIG. The same components as those of the first to third embodiments are designated by the same reference numerals, and the description thereof will be omitted here.

In the figure, reference numerals 26a and 26b denote capacitors for smoothing / stabilizing the full-wave rectified waveform by the diode bridge 9. Here, a plurality of capacitors are connected in series. Also, these capacitors 26
a and 26b have the same capacity, and when the power source 1 is turned on or a switch (not shown) that activates the brushless motor 3 is operated, the relay contacts 27a and 27b connected to the capacitors 26a and 26b are turned on and off. Open and close in sequence.

In this embodiment, all the relay contacts are not closed, and at least one relay contact remains open, and a switch (a switch for starting the fan motor 3 to short-circuit a capacitor after all the capacitors have been charged) (Not shown) is configured to be changed each time it is operated.

As a result, the capacitors 26a and 26a
b is discharged sequentially except at least one capacitor. That is, all the capacitors 26a and 26b can be
The charging of can be completed, and the entire circuit can be started once in a short time. Fan motor 3
When one of the capacitors that activates the switch is operated, any one of the capacitors is short-circuited, so the voltage of the capacitor temporarily drops immediately after the switch is operated, but basically the brushless motor 3 causes a slow start, so in practice there is almost no problem. However, since the charge amount is set to be larger than the discharge amount due to the operation of the brushless motor 3, the capacitor can complete the charge during the slow start.

Further, since the capacitors short-circuited after the charging of all the capacitors is changed every time the switch for starting the fan motor is operated, all the capacitors are in the same average usage condition, There is no bias due to, and the entire capacitor life can be secured for a long period of time.

In this embodiment, the case of using two capacitors has been described, but the same applies to the case of using three or more capacitors. Further, the capacitances of the capacitors may be set to be the same, or a state in which none of the capacitors is charged may be realized by using a relay contact.

(Embodiment 5) Next, another embodiment of the present invention will be described with reference to FIG. The same components as those in the first to fourth embodiments are designated by the same reference numerals, and the description thereof will be omitted here.

In the figure, reference numerals 30a, 30b and 30c are all rotation speed detecting means for detecting the rotation speed of the brushless motor 3 from the rotating magnetic field generated in proportion to the rotation speed of the brushless motor 3, and inside the brushless motor 3 The rotor (not shown) is arranged in the immediate vicinity. Reference numeral 31 is a rotation speed error detection means for calculating an error between the set rotation speed and an actual rotation speed based on the outputs of the rotation speed detection means 30a to 30c, and outputs the rotation speed error to the driver means 5.
(As will be described later, the air volume can be detected by the rotation speed error.) The driver means 5 reduces the rotation speed of the brushless motor 3 in the high air flow area or the low air flow area by the output of the rotation speed error detection means 31, and the work is performed. The motor control unit 4 is controlled so that the maximum rotation speed is reached in the air volume range where the ratio is maximum. Hereinafter, description will be given with reference to FIG. 7.

In FIG. 7, the lower curve of the two curves is the relationship between the air volume Q and the rotational speed N (hereinafter referred to as "QN characteristic").
It means that). On the other hand, the upper curve shows the relationship between the air volume Q and the power W0 (hereinafter referred to as "Q-W0 characteristic").

In the Q-N characteristic, the straight line indicated by the alternate long and short dash line is the set rotational speed N0 of the brushless motor 3, and the curve indicated by the broken line is the Q when the brushless motor 3 is operated without control. -N characteristic. As you can see from the figure,
The higher the air volume, the larger the error from the set rotational speed N0, and the lower the air volume, the smaller the error. (This is because air acts as a mechanical load on the brushless motor.) That is, the air volume can be detected by detecting the rotation speed error.

As described above, in the present embodiment, the motor control is performed such that the rotation speed of the brushless motor 3 is reduced in the high air volume region or the low air volume region, and the maximum rotation speed is obtained in the air volume region where the power is maximum. Since the means 4 is controlled, the actual Q
The −N characteristic is shown by the solid line. (Even if the control indicated by the solid line is performed, the air volume can be reliably detected by detecting the rotation speed error. That is, the rotation speed error detecting means 3
1 functions as an air volume detection means. By this control, it is possible to suppress resonance that occurs between the motor that rotates at high speed and each component that constitutes the cleaner body. In addition, it is possible to reduce power consumption in the high air volume region, to ensure the power percentage at the power percentage point, and to suppress the surging noise and the heat generation of the brushless motor due to the reduction of the cooling air in the low air volume region. .

(Sixth Embodiment) Next, another embodiment of the present invention will be described with reference to FIG. The same components as those in the first to fifth embodiments are designated by the same reference numerals, and the description thereof will be omitted here.

In the figure, reference numeral 32 is a rotation speed detecting means 30a.
High frequency sound calculation means (hereinafter referred to as "Nz sound calculation means") for obtaining the product and phase of the rotation speed of the brushless motor 3 and the number of blades of the fan based on the output of 30c, and a phase opposite to the obtained phase. The Nz frequency of is output. Reference numeral 33 is a sounding means which is arranged in the vicinity of the brushless motor 3 to generate sound based on the output of the Nz sound calculation means 32. In this embodiment, a speaker is arranged in the exhaust passage.

With the above configuration, by outputting the Nz sound accompanying the rotation of the brushless motor 3 and the opposite phase of the sound from the sounding means 33 to the exhaust passage, so-called active muffling (in the present invention, the rotation speed of the brushless motor 3 is detected). Therefore, it is possible to reduce the noise with a high degree of accuracy, and to significantly reduce annoying sound.

(Embodiment 7) Next, another embodiment of the present invention will be described with reference to FIGS. 9 and 10. The first to the first
The same components as those in the sixth embodiment are designated by the same reference numerals, and the description thereof will be omitted here.

In the figure, reference numeral 34 is a valve provided in the exhaust passage of the brushless motor 3, which incorporates a small motor (not shown), and the exhaust area can be changed by this operation. Reference numeral 35 denotes an exhaust area control means, which controls the motor built in the valve 34 based on the output of the Nz sound calculation means 32. When the Nz sound is high, the exhaust area is increased, and when the Nz sound is low, the exhaust area is decreased. Thus, the sound can be made independent of the rotation speed (Nz sound) of the brushless motor 3.

[0064]

According to the present invention, it is possible to provide an electric vacuum cleaner which prevents a decrease in suction work rate, has improved durability, and is small and lightweight.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of an electric vacuum cleaner showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the electric vacuum cleaner.

FIG. 3 is a circuit block diagram of an electric vacuum cleaner showing a second embodiment of the present invention.

FIG. 4 is a circuit block diagram of an electric vacuum cleaner showing a third embodiment of the present invention.

FIG. 5 is a circuit block diagram of an electric vacuum cleaner showing a fourth embodiment of the present invention.

FIG. 6 is a circuit block diagram of an electric vacuum cleaner showing a fifth embodiment of the present invention.

FIG. 7 is an operation explanatory diagram of the electric vacuum cleaner.

FIG. 8 is a circuit block diagram of an electric vacuum cleaner showing a sixth embodiment of the present invention.

FIG. 9 is a circuit block diagram of an electric vacuum cleaner showing a seventh embodiment of the present invention.

FIG. 10 is a cross-sectional view of the main parts of the electric vacuum cleaner.

[Explanation of symbols]

3 brushless motor 4 Motor control means 5 Driver means 6 DC power supply means 7 Inverter device 15 Dust detection means 16 Pulse width measuring means 17 Input signal processing means 20 cyclone dust chamber

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor ▲ Taka ▼ Masaki Hashi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Yoshitaka Murata             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Tsuyoshi Nishimura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 3B057 DA04 DA06                 3B062 AH05                 5H560 BB04 BB12 DA00 DB20 DC12                       DC13 EB01 JJ12 RR07 SS07                       UA02

Claims (20)

[Claims] 1. A brushless motor incorporated in an electric blower that emits suction air, a motor control unit that controls the operation of the brushless motor, a driver unit that outputs a drive signal of the brushless motor to the motor control unit, and the brushless unit. An electric vacuum cleaner comprising an inverter device comprising direct current power supply means for supplying an applied voltage to a motor, and a dust collecting chamber for separating dust by a cyclone action by swirling suctioned air upstream of the electric blower. 2. A brushless motor built in an electric blower for generating suction air, motor control means for controlling the operation of the brushless motor, driver means for outputting a drive signal of the brushless motor to the motor control means, and the brushless motor. An inverter device composed of a DC power supply means for supplying an applied voltage to the motor, and an air volume detection means for detecting the suction air volume, and the suction air volume is in the range other than an arbitrary air volume range including the air volume that maximizes the work rate, An electric vacuum cleaner configured to reduce the rotation speed of a brushless motor. 3. The electric vacuum cleaner according to claim 2, wherein a rotation speed error detection means for detecting a difference between an actual rotation speed and a set rotation speed of the brushless motor is used as the air volume detection means. 4. A dust detecting means for detecting the presence or absence of sucked dust and the size of the dust and outputting a pulse according to the size of the dust, and a pulse width measuring means for measuring the pulse width of the pulse. The electric vacuum cleaner according to claim 1 or 2, further comprising: a driver unit that outputs a drive signal for the brushless motor according to an output of the pulse width measuring unit. 5. An input signal processing means for processing an output signal from a dust detection means for detecting the presence or absence of dust and its size is provided, and the input signal processing means and the driver means are processed using different functional elements. The electric vacuum cleaner according to claim 4. 6. The electric vacuum cleaner according to claim 1, further comprising an electric motor and a rotary brush that is rotated by the electric motor, and a suction unit that communicates with the cyclone dust collecting chamber. 7. A microswitch electrically connected in series with an electric motor is provided, and the electric motor and the microswitch are provided with:
The vacuum cleaner according to claim 6, wherein a full-wave rectified waveform obtained by full-wave rectifying an AC waveform is supplied. 8. The electric vacuum cleaner according to claim 6, wherein power is supplied to the electric motor from the DC power supply means. 9. The electric vacuum cleaner according to claim 1, wherein the DC power supply means is insulated from a power supply that applies a voltage to the cleaner body. 10. The DC power supply means is provided with a current limiter for detecting lock of the electric motor, and the electric motor is set to operate after a lapse of a predetermined time from when the electric current limiter detects lock of the electric motor. Vacuum cleaner. 11. A power supply voltage detection means for detecting a voltage applied to the entire cleaner and outputting it to a driver means, and controlling the rotation speed of the brushless motor according to the output of the power supply voltage detection means. The vacuum cleaner according to claim 10. 12. A power supply current detecting means for detecting a current flowing through the entire vacuum cleaner and outputting it to a driver means, and controlling the rotation speed of the brushless motor according to the output of the power supply current detecting means. The electric vacuum cleaner according to claim 1. 13. The electric vacuum cleaner according to claim 12, wherein the number of revolutions of the brushless motor is controlled so that the output of the power supply current detection means becomes a predetermined value or less. 14. A brushless motor, a motor control means, a driver means, and a direct current power supply means constitute an inverter device, and a plurality of capacitors for smoothing and stabilizing the voltage applied to the inverter device are connected in parallel and a plurality of capacitors are provided. The vacuum cleaner according to any one of claims 1 to 13, wherein the capacitor is sequentially charged when the power is turned on or when the brushless motor is started. 15. The vacuum cleaner according to claim 14, wherein the capacities of the plurality of capacitors are set to be different from each other, and when the power is turned on or the brushless motor is started, the capacitor having a small capacity is charged as needed. . 16. A brushless motor, a motor control means, a driver means, and a DC power supply means constitute an inverter device, and a plurality of capacitors for smoothing and stabilizing the voltage applied to the inverter device are connected in series to provide a plurality of capacitors. The vacuum cleaner according to claim 1, wherein at least one capacitor is short-circuited when the brushless motor is started after all the capacitors have been charged. 17. The vacuum cleaner according to claim 16, wherein the capacitor to be short-circuited is changed each time the brushless motor is started. 18. A rotation speed detection means for detecting the rotation speed of the brushless motor, and a high frequency sound calculation means (hereinafter referred to as "Nz sound calculation means") for obtaining a product and a phase of the rotation speed and the number of blades of the fan. The electric vacuum cleaner according to any one of claims 1 to 17, further comprising: a sound generating unit which is arranged near a brushless motor and generates a sound based on an output of the Nz sound calculating unit. 19. The electric vacuum cleaner according to claim 18, wherein the sounding means is provided in an exhaust passage of the brushless motor. 20. Rotation speed detection means for detecting the rotation speed of the brushless motor, and high frequency sound calculation means (hereinafter referred to as "Nz sound calculation means") for obtaining the product and phase of the rotation speed and the number of blades of the fan. 18. A valve provided in the exhaust passage of the brushless motor, and exhaust area control means for controlling the valve based on the output of the Nz sound calculation means to vary the exhaust area. Vacuum cleaner according to the item.