JPH10328101A - Electric cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a phase angle for controlling the phase of input to a motor- driven air blower to a maximum input through a variable resistor only so as not to exceed a specified higher harmonic current limit value. SOLUTION: The resistance value change characteristics of variable resistor for phase angle setting provided at an input control circuit for controlling the phase of the motor-driven air blower are made into near a resistance value at 90⊥ phase angle, namely, into non-linear resistance value characteristics with which the resistance value is rapidly changed to the stroke of the variable resistor in areas E-C, and the areas of resistance values (X+Y)Ω-ZΩto apply an input exceeding the higher harmonic current limit value are skipped. In this case, A is a resistance value to apply the maximum input and set to 0Ω in such a state but is not limited to this value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to control of a vacuum cleaner.

[0002]

2. Description of the Related Art A conventional vacuum cleaner will be described below with reference to the drawings. FIG. 5 is a circuit diagram showing a general configuration of a conventional vacuum cleaner. As shown in the drawing, a series circuit of an electric blower 1, an input control circuit 2, and an on / off switch 3 is connected to an AC power supply 4, and a user operates the input control circuit 2 to adjust a suction force. Configuration. Input control circuit 2
Controls the input to the electric blower 1 by phase control, and the phase angle is set by a variable resistor (not shown) operated by the user. FIG. 6 shows the input control circuit 2
FIG. 9 is a characteristic diagram showing the operation of FIG. In the figure, the horizontal axis indicates the position of the variable resistor when the operation mode is set to curtain, sofa, ordinary (N), floor, and carpet, for example, the rotation angle and the sliding amount, and the vertical axis indicates the electric blower 1.
Indicates input to. As shown in the figure, the input to the electric blower 1 generally uses a variable resistor having a characteristic that changes in proportion to the position, that is, a linear characteristic.

However, in the above configuration, the higher the maximum input is, the higher the harmonic current value is, and as a result, there is a case where a malfunction occurs in other electric products. Therefore, as shown in FIG. 7, the electric blower 1 is a tap-out electric blower including a tap A and a tap B, and the tap A and the tap B are switched by the changeover switch 5 and the changeover switch 6, Up to an input that does not exceed the harmonic current limit value, for example, 1200 W in the example shown in FIG.
Until the adjustment by the input control circuit 2 by the operation of the variable resistor 7, switching to the maximum input, and switching to 1400W in the example shown in FIG. 9, the tap is changed from A to B by the changeover switch 5 and the changeover switch 6. I was switching.

[0004]

In such a conventional vacuum cleaner, as described above, when the maximum input increases, the harmonic current value also increases, which may cause other electric products to malfunction. there were. Also, as shown in FIG. 9, the third harmonic current value may exceed the limit value of the IEC standard in the vicinity where the phase angle becomes 90 degrees. In addition, in the configuration shown in FIGS. 7 and 8, since the tap-out electric blower and the changeover switch 5 and the changeover switch 6 are used, there is a problem in assembling such as troublesome connection.
There is also a problem that the cost increases due to an increase in the number of parts.

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and to provide a vacuum cleaner capable of performing input control only with a variable resistor up to the maximum input without increasing the number of parts and exceeding a harmonic current limit value. With the goal.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a resistance change characteristic of a variable resistor for setting a phase angle for controlling a phase of an input to an electric blower. This is a vacuum cleaner having a non-linear resistance value change characteristic in which the resistance value changes abruptly in the vicinity.

Thus, the input range exceeding the harmonic current limit value is skipped, so that the input control up to the maximum input without exceeding the harmonic current limit value is performed only by the variable resistor without increasing the number of parts. Can be.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A variable resistor in a vacuum cleaner according to the present invention has a non-linear resistance value change characteristic in which a resistance value sharply changes near a phase angle of phase control of 90 degrees. In the embodiment, a sliding type variable resistor,
The first to third resistance foils are arranged on the substrate, and are set so that the resistance value changes abruptly near the resistance value giving a phase angle of 90. As means for rapidly changing the resistance value, a resistance value non-change portion is provided next to the resistance portion where the resistance value changes linearly, and then the resistance value is reduced once by connecting the resistance foil in parallel. When the resistance foil is switched, the resistance value has a resistance portion that changes linearly again, and the resistance value change characteristic is nonlinear as a whole.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the vacuum cleaner according to the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of the present embodiment. The same components as those in the conventional example shown in FIG. 7 are denoted by the same reference numerals, and detailed description is omitted. This embodiment is different from the conventional example in the resistance change characteristic of the variable resistor 7.

FIG. 2 is a sectional view showing the structure of the variable resistor according to the present embodiment, and FIG. 3 is a plan view of the same. In the figure, 1
1 is a substrate provided with a resistive foil, 12 is a sliding brush provided with two sets of contacts sliding on the resistive foil, and 13 and 14 are an upper case and a lower case respectively housing the substrate 11 and the sliding brush 12. Case, 15 is a conductive foil, 16 is a first resistance foil having a resistance value of YΩ, 17 is a second resistance foil having a resistance of WΩ,
Reference numeral 18 denotes a third resistance foil having a resistance of ZΩ, 19 denotes a cut portion in which the second resistance foil 17 and the third resistance foil 18 are obliquely separated by a predetermined distance h smaller than the width of the brush, and 20 denotes a second resistance foil 17. , A resistance value unchanged portion provided in a range from the cut portion 19 to the first resistance foil 16, and its resistance value is set to XΩ. However, it is assumed that X <W. Further, each resistance value is set to a resistance value which becomes an input exceeding the harmonic current limit value by ZΩ or more, (X
+ Y) Set so as to be less than Ω.

In the above configuration, a change in the input from the low input side to the electric blower 1, that is, the input change from the side having a large resistance value to the high input side will be described. FIG. 4 is a characteristic diagram showing a resistance value change characteristic of the variable resistor 7 in the present embodiment. At the time of low input, the sliding brush 12 includes the conductive foil 15 and the second resistance foil 1.
7 while sliding. The sliding range is the second resistance foil 1
7, the change in resistance from one end to the resistance-invariable portion 20 changes from (W + Y) Ω of the portion F to E as shown in FIG.
, And sequentially decreases to (X + Y) Ω, and the input to the electric blower 1 increases sequentially. Next, the sliding brush 12 slides on the resistance value unchanged portion 20, and the resistance value does not change at (X + Y) Ω and the input does not change. Further, when the sliding brush 12 reaching the portion D in FIG.
9 is provided obliquely with respect to the sliding direction of the sliding brush 12, the sliding brush 12 short-circuits the second resistive foil 17 and the third resistive foil 18, and the resistance value of FIG. As shown in part C of FIG. 1, the first resistance foil 16, the third resistance foil 18,
Combined resistance value of second resistance foil 17 and resistance value unchanged portion 20
Z (X + Y) / (X + Y + Z) Ω. This E
It is possible to skip a resistance value range in which an input exceeds the harmonic current limit value between the section and the section C, that is, not less than ZΩ and less than (X + Y) Ω. When the sliding brush 12 is further slid, the sliding brush 12 separates from the cutting portion 19 and slides toward the third resistance foil 18 side.
The input rises to Ω and the input drops slightly. Further, when the sliding brush 12 slides on the third resistance foil 18, the resistance value becomes Z in the B portion.
From Ω to 0 Ω in section A to obtain the maximum input.

As described above, according to the present embodiment, the resistance change characteristic of the variable resistor 7 is made non-linear, and the resistance value changes abruptly near the phase angle of 90 degrees, thereby achieving higher harmonics. Since the range of the resistance value exceeding the current limit value can be skipped, it is possible to realize a vacuum cleaner capable of adjusting up to the maximum input with only the variable resistor 7, and to reduce the number of parts to improve workability. It can also contribute to lower prices.

[0013]

As is apparent from the above description, the present invention makes the resistance change characteristic of the variable resistor for setting the phase angle for controlling the phase of the input to the electric blower non-linear, and makes the phase angle 90 degrees. The resistance value changes abruptly in the vicinity of, and it is possible to realize a vacuum cleaner that can be adjusted to the maximum input with only a variable resistor so that the harmonic current limit value is not exceeded, reducing the number of parts As a result, the workability can be improved and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of an embodiment of a vacuum cleaner according to the present invention.

FIG. 2 is a schematic sectional view showing a configuration of a variable resistor in the vacuum cleaner of the present invention.

FIG. 3 is a plan view showing a configuration of a variable resistor in the vacuum cleaner of the present invention.

FIG. 4 is a characteristic diagram showing a resistance change characteristic of a variable resistor in the vacuum cleaner of the present invention.

FIG. 5 is a circuit diagram showing a configuration of a conventional vacuum cleaner.

FIG. 6 is a characteristic diagram showing a resistance value change characteristic of a variable resistor in a conventional vacuum cleaner.

FIG. 7 is a circuit diagram showing a configuration of another conventional vacuum cleaner.

FIG. 8 is a characteristic diagram showing an operation of the vacuum cleaner.

FIG. 9 is a characteristic diagram showing a third harmonic current value of the vacuum cleaner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric blower 2 Input control circuit 3 ON / OFF switch 4 AC power supply 5, 6 changeover switch 7 Variable resistor 11 Substrate 12 Sliding brush 13 Upper case 14 Lower case 15 Conductive foil 16 First resistance foil 17 Second resistance foil 18 Third resistance foil 19 Cutting section 20 Resistance value unchanged section

Claims (1)

[Claims] An electric blower, an input control circuit for controlling an input to the electric blower by phase control, and a variable resistor for setting a phase angle of the phase control, wherein a resistance value of the variable resistor is A vacuum cleaner having a non-linear resistance value change characteristic that changes rapidly near the phase angle of 90 degrees.