JPH0767816A - Control circuit of vacuum cleaner - Google Patents

Abstract

PURPOSE:To suppress a harmonic component immediately before the maximum input by varying the input by phase control, when the tap is switched to other tap than the maximum input, in the vacuum cleaner for producing plural pieces of intermediate taps from the stator of a motor and varying the input by switching its tap. CONSTITUTION:When a first changeover switch 6 is switched to the left side, and a second changeover switch 7 is switched to the upper side, a current route of a tap producing motor 3 becomes (1) (3) (4). In this case, even if the input is varied by executing phase control by an input controller 5, the harmonic component superposed on a power source line is small since the motor input is small. On the other hand, when the switch 6 is switched to the right side, and the switch 7 is switched to the lower side, the current route of the motor 3 becomes (2) (3) (5), and the motor 3 becomes the maximum input, but in this case, since the phase control is not executed, the higher harmonic component is not produced to the power source line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner control circuit.

[0002]

2. Description of the Related Art In a conventional vacuum cleaner control circuit, as shown in FIG. 7, a motor 1 is phase-controlled by an input controller 2 to vary an input.

[0003]

However, in such a control method, when the vacuum cleaner is used near the maximum input in the recent situation of high power of vacuum cleaners, the harmonic component of the phase control waveform becomes large, It has a big problem that it gets on the power supply line and adversely affects other devices connected to the commercial power supply. In view of the above problems, the present invention provides a control circuit for an electric vacuum cleaner that can change the input even at high power and can suppress the harmonic component immediately before the maximum input.

[0004]

In order to achieve the above object, the first technical means of the present invention is to output a plurality of intermediate taps from a stator of a motor, and to change the input by switching the taps. It is an object of the present invention to provide a control circuit for an electric vacuum cleaner that can change the input by phase control when switching to a tap other than the maximum input.

In order to achieve the above object, the second technical means of the present invention can change the input by phase control when switching to a tap other than the maximum input, and can change the input from the tap other than the maximum input to the maximum input. An object of the present invention is to provide a control circuit of an electric vacuum cleaner that shifts the switching timing of the switch when switching to a tap with a plurality of switches.

In order to achieve the above object, the third technical means of the present invention can change the input by phase control when switching to a tap other than the maximum input, and switch the tap by a bidirectional thyristor or the like. It is an object of the present invention to provide a control circuit for a vacuum cleaner that uses a semiconductor switch.

In order to achieve the above-mentioned object, the fourth technical means of the present invention can change the input by phase control when switching to a tap other than the maximum input, and when switching to the maximum input, An object of the present invention is to provide a control circuit of a vacuum cleaner that switches after passing an input between the input before switching and the input before switching.

In order to achieve the above object, the fifth technical means of the present invention can change the input by phase control when switching to a tap other than the maximum input, and the tap for the maximum input can be 1 in series. An object of the present invention is to provide a control circuit for an electric vacuum cleaner having a voltage drop means such as one or more resistors and provided with a switch for short-circuiting the voltage drop means.

[0009]

By the first means of the present invention, the input can be changed even with a high power motor without affecting other devices.

By the second means of the present invention, it is possible to reduce the discomfort felt by the user when switching to the maximum input.

By the third means of the present invention, the life of the device can be extended. According to the fourth means of the present invention, it is possible to reduce the discomfort felt by the user at the time of switching to the maximum input, and also to eliminate the unevenness of the brush of the motor.

According to the fifth means of the present invention, it is possible to set the input between the maximum input and the input before the maximum input, and it is possible to provide a convenient vacuum cleaner.

[0013]

【Example】

(Embodiment 1) An embodiment of the first means of the present invention will be described below with reference to the drawings. In FIG. 1, 3 is a tapping motor in which an intermediate tap is provided in the stator and the input is switched by switching the tap. When the current flows in the figure with tap numbers (1) → (3) → (4), the input becomes smaller. , (2) → (3) → (5), the maximum input is obtained when the current flows. The tap controller (1) is connected to an input controller 5 whose input can be varied by a variable resistor 4 and a switch. The other end of the input controller 5 and the tap controller (2) are connected to the first number as shown in the figure. The changeover switch 6 of is connected. Further, a second changeover switch 7 is connected as shown in the figure as a means for changing the tap numbers (4) and (5), and the first changeover switch 6 and the second changeover switch 7 are switched in conjunction with each other. It is composed.

The operation of the control circuit of the electric vacuum cleaner thus constructed will be described below. First, when the first selector switch 6 is switched to the left side of the figure and the second selector switch 7 is switched to the upper side of the figure, the current path of the tapping motor 3 is (1) → (3).
→ (4). At this time, even if the input controller 5 performs phase control to vary the input, the motor input is small, so that the harmonic components superimposed on the power supply line are small. Next, when the first selector switch 6 is switched to the right side of the drawing and the second selector switch 7 is switched to the lower side of the drawing, the tapping motor 3
The current path of (1) becomes (2) → (3) → (5), and the tap-out motor 3 has the maximum input. At this time, however, since phase control is not performed, no harmonic component appears in the power supply line. As the switching means of the first and second changeover switches 6 and 7, a method of interlocking with the variable resistor 4 of the input controller 5 as shown in FIG. 2 or a method of changing the input by switches as shown in FIG. Is easily conceivable.

(Embodiment 2) Next, an embodiment of the second means of the present invention will be described with reference to the drawings. In FIG. 1, when the first changeover switch 6 is changed from the left side to the right side in the figure and the second changeover switch 7 is changed from the upper side to the lower side in the figure, the first changeover switch 6 is not changed at the same time, but the first changeover switch 6 is changed to the right side. If the configuration is such that the second changeover switch 7 is switched to the lower side after switching, the current path of the tapping motor 3 is (2) → (3).
→ (4) Once, then (2) → (3) → (5)
And the maximum input. As a result, when switching to the maximum input, the input between the maximum input and the input before switching once is passed. Of course, the same effect can be obtained even if the first changeover switch 6 is changed over after the second changeover switch 7 is changed over.

(Embodiment 3) Next, an embodiment of the third means of the present invention will be described with reference to the drawings. In FIG. 4, reference numeral 8 is a first bidirectional thyristor, to the gate terminal of which a first small current switch 12 is connected as shown. A second bidirectional thyristor 9 has a gate terminal to which a second small current switch 13 is connected as shown in the figure. Reference numeral 10 denotes a third bidirectional thyristor, to the gate terminal of which a third small current switch 14 is connected as shown in the figure. Reference numeral 11 denotes a fourth bidirectional thyristor, to the gate terminal of which a fourth small current switch 15 is connected as shown in the figure. Each small current switch is configured to be turned on and off in conjunction with each other. When the first small current switch 12 and the second small current switch 13 are on, the third small current switch 14 and the fourth small current switch 14 are connected. The current switch 15 is off.

The operation of the control circuit of the electric vacuum cleaner thus constructed will be described below. First, when the first small current switch 12 and the second small current switch 13 are turned on, the first bidirectional thyristor 8 and the second bidirectional thyristor 9 are turned on. The path becomes (1) → (3) → (4). At this time, even if the input controller 5 controls the phase to change the input, the motor input is small, and therefore the harmonic components superimposed on the power supply line are small. . Next, when the first small current switch 12 and the second small current switch 13 are turned off,
The first bidirectional thyristor 8 and the second bidirectional thyristor 9 are turned off, the third small current switch 14 and the fourth small current switch 15 are turned on, and the third bidirectional thyristor 10 and Since the fourth bidirectional thyristor 11 turns on,
The current path of tapping motor 3 is (2) → (3) →
(5) and the tapped motor 3 has the maximum input, but at this time, since the phase control is not performed, no harmonic component is added to the power supply line, and each small current switch is connected to each bidirectional thyristor. Since only the gate current flows, the life of each small current switch is extended.

(Embodiment 4) Next, an embodiment of the fourth means of the present invention will be described with reference to the drawings. In FIG. 5, 16 is a third changeover switch, and the changeover terminal is A
The configuration is such that it passes through the terminal B during switching from C to C, and the phase cut circuit 17 is connected to the terminal B.

The operation of the control circuit of the electric vacuum cleaner thus constructed will be described below. First, when the third selector switch 16 is switched to the left side of the figure and the second selector switch 7 is switched to the upper side of the figure, the current path of the tapping motor 3 is (1) → (3).
→ (4). At this time, even if the input controller 5 performs phase control to vary the input, the motor input is small, so that the harmonic components superimposed on the power supply line are small. Next, when the third changeover switch 16 is connected to the terminal B when switching to the right side of the drawing, the phase cut circuit 17 serves as an input between the maximum input and the input at the terminal A. The intermediate input is once passed by the time the third changeover switch 16 is switched to the C side in the figure.

(Embodiment 5) Next, an embodiment of the fifth means of the present invention will be described with reference to the drawings. In FIG. 6, reference numeral 18 is a resistor, and a switch 19 capable of short-circuiting both ends thereof is connected as shown in the figure.

The operation of the control circuit of the electric vacuum cleaner thus constructed will be described below. First, when the first selector switch 6 is switched to the left side of the figure and the second selector switch 7 is switched to the upper side of the figure, the current path of the tapping motor 3 is (1) → (3).
→ (4). At this time, even if the input controller 5 performs phase control to vary the input, the motor input is small, so that the harmonic components superimposed on the power supply line are small. Next, when the first selector switch 6 is switched to the right side of the figure, the second selector switch 7 is switched to the lower side of the figure, and the switch 19 is closed, the current path of the tapping motor 3 is (2) →
(3) → (5), and the tapping motor 3 has the maximum input, but at this time, since the phase control is not performed, no harmonic component is added to the power supply line. At this time, if the switch 19 is opened, the current is limited by the resistor 18,
The input between the maximum input of the tapping motor 3 and the input before switching to the maximum input can be arbitrarily set.
The resistance value at this time can be a low resistance because it is sufficient to drop the input slightly from the maximum input, so a small resistance can be used.

[0022]

As is apparent from the above, the first aspect of the present invention
According to the invention, even if a high-power motor is used, it is possible to suppress the leakage of harmonics to the power supply, and it is possible to provide an electric vacuum cleaner that does not affect other devices.

Further, according to the second aspect of the present invention, since there is no abrupt input switching at the time of switching to the maximum input and switching is performed in stages, it is possible to provide an electric vacuum cleaner that does not cause a user to feel uncomfortable.

Further, according to the third aspect of the present invention, since the large current flowing through the motor is switched by the semiconductor switching element, the switching life is long and harmonic leakage can be suppressed. It is possible to provide an electric vacuum cleaner that does not affect other devices.

Further, according to the fourth aspect of the present invention, when switching to the maximum input, there is no abrupt input switching, and there is a stepwise switching, and a voltage is evenly applied to the motor even during the switching process. As a result, the electric vacuum cleaner can be provided so that the brush of the motor does not slip and the user does not feel uncomfortable.

Furthermore, according to the fifth aspect of the present invention,
Since the input between the maximum input and the phase controllable input can be set, the user can use the input in the entire range of the required input and can suppress the leakage of harmonics, which may affect other devices. No vacuum cleaner can offer.

[Brief description of drawings]

FIG. 1 is a block diagram of a control circuit of an electric vacuum cleaner according to an embodiment using the first and second means of the present invention.

FIG. 2 is an input switching circuit diagram by a variable resistor according to an embodiment using the first means of the present invention.

FIG. 3 is an input switching circuit diagram of a switch according to an embodiment using the first means of the present invention.

FIG. 4 is a block diagram of a control circuit of the electric vacuum cleaner according to the embodiment using the third means of the present invention.

FIG. 5 is a block diagram of a control circuit of an electric vacuum cleaner according to an embodiment using the fourth means of the present invention.

FIG. 6 is a block diagram of a control circuit of an electric vacuum cleaner according to an embodiment using the fifth means of the present invention.

FIG. 7 is a block diagram of a control circuit of a conventional electric vacuum cleaner.

[Explanation of symbols]

 3 tapping motor 4 variable resistor 5 input controller 6 first changeover switch 7 second changeover switch 8 first bidirectional thyristor 9 second bidirectional thyristor 10 third bidirectional thyristor 11 fourth Bidirectional thyristor 12 First small current switch 13 Second small current switch 14 Third small current switch 15 Fourth small current switch 16 Third changeover switch 18 Resistance 19 switch

Front page continuation (72) Inventor Seiichi Ueno 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A vacuum cleaner in which a plurality of intermediate taps are output from a motor stator and the input is changed by switching the taps, the input can be changed by phase control when the tap is switched to a tap other than the maximum input. Vacuum cleaner control circuit. 2. An electric vacuum cleaner in which a plurality of intermediate taps are output from a motor stator and the input is changed by switching the taps, the input can be changed by phase control when the tap is switched to a tap other than the maximum input. , A control circuit of an electric vacuum cleaner that shifts the switching timing of the switch when switching from a tap other than the maximum input to a tap for the maximum input with a plurality of switches. 3. A vacuum cleaner in which a plurality of intermediate taps are output from the motor stator and the input is changed by switching the taps, the input can be changed by phase control when the tap is switched to a tap other than the maximum input. , Control circuit of the vacuum cleaner that switches taps with a semiconductor switch such as a bidirectional thyristor. 4. A vacuum cleaner in which a plurality of intermediate taps are output from a motor stator and the input is changed by switching the taps, the input can be changed by phase control when the tap is switched to a tap other than the maximum input. , The control circuit of the electric vacuum cleaner that switches after passing through the input between the maximum input and the input before switching when switching to the maximum input. 5. A vacuum cleaner in which a plurality of intermediate taps are output from the motor stator and the input is changed by switching the taps, the input can be changed by phase control when the tap is switched to a tap other than the maximum input. A control circuit for a vacuum cleaner having a voltage drop means such as one or a plurality of resistors in series with a tap for maximum input, and a switch for short-circuiting the voltage drop means.