JP4983411B2 - Electric vacuum cleaner - Google Patents

Description

  The present invention relates to a vacuum cleaner, and more particularly to a vacuum cleaner having a function of suppressing power supply harmonic current.

  From various electric / electronic devices, harmonic currents are emitted from the power cord by performing load switching control, which deteriorates the power quality. Therefore, the IEC 61000-3-2 standard (hereinafter referred to as “IEC standard”). In other words, all electrical devices are required to suppress the harmonic current of the power source that is emitted from itself.

  In vacuum cleaners, compliance with this standard is indispensable, but with the recent increase in power, this compliance is becoming increasingly difficult.

  The countermeasures generally taken are those having configurations as shown in Patent Document 1 and Patent Document 2, but in the configuration shown in Patent Document 1, the total amount of power supply harmonics cannot be suppressed, and the above IEC standard is not possible. It only reduces the measured value at the time of the integer that is subject to regulation.

  In the configuration shown in Patent Document 2, the phase control is not performed when the maximum input is set, so that the power supply current waveform is hardly distorted and the power supply harmonic current is small. However, in cases other than the maximum input setting, the phase control is performed because the phase control is performed. As can be seen from the FFT analysis, the power supply harmonic current is high.

In the vacuum cleaner, the third harmonic current is generally large, and when the phase is set to 90 °, there is about 2.8 A, which greatly exceeds the standard value 2.3 A.
European Patent Application Publication No. 08559452 JP 7-67816 A

  On the other hand, when the actual usage is investigated, most users are using the maximum input setting or the minimum input setting, and since the frequency of use at the standard value at the 90 ° phase setting currently targeted by the IEC standard is low, 2008 From the year, in addition to the current 90 ° setting, the standard applies a value obtained by averaging the power harmonic current measurement total value for each order at each of the maximum input setting and minimum input setting. Be changed.

  The present invention responds to the above-mentioned trend, and at the time of maximum input setting and minimum input setting, the power supply harmonic current of the electric blower is almost sinusoidal and the electric vacuum cleaner has reduced power supply harmonic current. provide.

In order to solve the above-described conventional problems, the electric vacuum cleaner of the present invention has a field winding provided with a plurality of taps of three or more and an electric blower for sucking dust, and switches each tap. And a phase control means for phase-controlling the electric blower, wherein the phase control means is connected only to taps other than taps at both ends of the plurality of taps. At the time of use, since the power supply voltage is directly applied to the field winding, a current waveform with very little waveform distortion can be taken out and the power supply harmonic current can be suppressed.

  Since this invention can take out a current waveform with very little waveform distortion at the time of use at the both ends of a tap, the vacuum cleaner which suppressed the power supply harmonic current can be provided.

The first invention has a field winding provided with a plurality of taps of three or more, an electric blower for sucking dust, a tap switching means for switching the taps, and a phase of the electric blower. Phase control means for controlling, and the phase control means is connected only to taps other than taps at both ends of the plurality of taps. When the taps at both ends are used, the power supply voltage is directly applied to the field winding. Since it is applied, a current waveform with very little waveform distortion can be taken out, and the power supply harmonic current can be suppressed.

  In particular, the second invention is set so that the maximum input of the electric blower can be taken out from one of the taps at both ends of the plurality of taps of the first invention, and the minimum input of the electric blower can be taken out from the other. When the maximum input is set and the minimum input is set, a current waveform with extremely little waveform distortion can be taken out, and the power harmonic current can be suppressed.

  In the third aspect of the invention, in particular, the phase control means of the first or second aspect of the invention controls the phase in an input range larger than the minimum input of the electric blower. Never have.

  In the fourth aspect of the invention, in particular, the average value of each order of each of the current harmonics at the time of setting the maximum input, the minimum input, and the input at 90 ° phase of the electric blower according to any one of the first to third aspects is predetermined. It is set so as not to exceed the regulation value. For example, if the regulation value is a regulation value of the power supply harmonic standard IEC-61000-3-2, it can be adapted to the relevant standard with an inexpensive configuration. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a circuit block diagram of the vacuum cleaner according to the first embodiment of the present invention, and FIG. 2 is a current waveform diagram of the vacuum cleaner.

  In FIG. 1, 1 is a field winding 4 provided with three tap groups (4a-1, 4a-2), (4b-1, 4b-2) and (4c-1, 4c-2). The tap 4a is set to a maximum input, the tap 4c is set to a minimum input, and the tap 4b is set to an intermediate input thereof.

  2 is a tap switching means for switching each tap 4 * -1 and 4 * -2 (*: a, b or c) in conjunction with each other, and an operating means (not shown) provided in the vacuum cleaner is provided. The user performs input settings by operating, and the taps 4 * -1 and 4 * -2 are switched accordingly.

  In the present embodiment, since both-field electric blower 1 is used, tap groups such as 4a-1 and 4a-2 are switched simultaneously.

  Reference numeral 3 denotes phase control means for controlling the phase of the electric blower 1, and supply to the electric blower 1 without connecting the phase control means 3 to the taps 4 a and 4 c at both ends of the three taps provided. In addition to being configured to be able to vary the power, the phase control performed by the tap 4b is configured to perform input control in a larger input range than the setting input at the tap 4c set to the minimum input.

  The operation and action of the vacuum cleaner configured as described above will be described below with reference to FIG.

(I) When taps 4a-1 and 4a-2 are used: Maximum input setting Since the power supply voltage waveform is directly applied to the electric blower 1, a current waveform with extremely little waveform distortion can be taken out. There is almost no wave current.

Third harmonic current: 1.9A
(II) When taps 4c-1 and 4c-2 are used: Minimum input setting Similarly to (I) above, since the power supply voltage waveform is applied to the electric blower 1 as it is, a current waveform with very little waveform distortion is applied. Since it can be taken out, there is almost no power source harmonic current.

  As shown in FIG. 3, the current waveform at the time of setting the minimum input of the conventional vacuum cleaner is a phase control waveform, which is a distorted waveform, whereas the current waveform is improved in the present embodiment. .

Third harmonic current: 1.6A
(III) When taps 4b-1 and 4b-2 are used: 90 ° phase at intermediate input setting Since a phase control waveform is applied to the electric blower 1 via the phase control means 3, waveform distortion is included. The current waveform is extracted, and the power supply harmonic current is large.

Third harmonic current: 2.8A
Therefore, the third harmonic current is (1.9 + 1.6 + 2.8) /3=2.1 A (<2.3 A: IEC standard value)
It can be seen that the IEC standard value can be satisfied.

  In this embodiment, the description has been given using the electric blower provided with three tap groups. However, the point is that the maximum input setting tap and the minimum input setting tap are provided, and the phase control is different from those. Needless to say, if the number of tap switching stages is three or more, the same idea can be used.

  As described above, the vacuum cleaner according to the present invention can extract a current waveform with extremely little waveform distortion when setting the maximum input and setting the minimum input, and can suppress the power supply harmonic current, so that the maximum input and the minimum input And the average value of each order of each current harmonic at the time of setting the input at 90 ° phase does not exceed the regulation value of the power supply harmonic standard IEC-61000-3-2, and it can correspond to the new standard. It can be applied to various vacuum cleaners for business use and store use.

The circuit block diagram of the vacuum cleaner in Embodiment 1 of this invention Current waveform diagram of the vacuum cleaner Current waveform diagram of a conventional vacuum cleaner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Tap switching means 3 Phase control means 4 Field winding 4a-1, 4a-2 Tap (for maximum input setting)
4b-1, 4b-2 tap (for intermediate input setting)
4c-1, 4c-2 tap (for minimum input setting)

Claims (4)

An electric blower having a field winding provided with a plurality of taps of three or more and sucking dust, a tap switching means for switching each tap, and a phase control means for phase-controlling the electric blower; And a vacuum cleaner in which the phase control means is connected only to taps other than taps at both ends of the plurality of taps. The electric vacuum cleaner according to claim 1, wherein a maximum input of the electric blower can be taken out from one of taps at both ends of the plurality of taps, and a minimum input of the electric blower can be taken out from the other. The electric vacuum cleaner according to claim 1 or 2, wherein the phase control means performs phase control in an input range larger than a minimum input of the electric blower. Any one of Claims 1-3 set so that each order average value of each current harmonic at the time of the input setting in the maximum input of an electric blower, minimum input, and a 90 degree phase may not exceed a predetermined regulation value. The vacuum cleaner as described in.

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