JP3595116B2 - Vacuum cleaner input control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an input control device for a vacuum cleaner that controls input power of a motor to be constant by phase control and current detection of the motor.
[0002]
[Prior art]
2. Description of the Related Art As a conventional input control device for a vacuum cleaner of this type, there is one disclosed in Japanese Patent Application Laid-Open No. 5-95877. This is intended to keep the current of the electric blower constant at all times in order to solve the problem that the input of the electric motor is maximized and wasteful power is consumed when the suction port is in the air. Comprises current detection means for detecting the current of the electric blower, amplification means for this output, and phase control means for controlling the number of revolutions of the electric blower, wherein the phase control means keeps the signal level from the amplification means constant. It is realized by controlling so that
[0003]
Japanese Patent Application Laid-Open No. Hei 7-213468 discloses a configuration in which a voltage detection unit is provided in addition to the above configuration, and the phase control unit is controlled so that the signal level of the current detection unit becomes constant according to the power supply voltage fluctuation. I have. Further, in Japanese Patent Application Laid-Open No. Hei 7-313415, it is possible to realize control for keeping the input of the motor constant by constant current control or constant phase angle control in substantially the same configuration.
[0004]
FIG. 18 shows the relationship between the current value of the suction motor and the input in a general vacuum cleaner, showing the control characteristics when the air volume (the amount of dust) is plotted on the horizontal axis. In the figure, (a) shows the characteristics when the motor applied voltage is fixed (uncontrolled). Naturally, the current value and the input power value maintain a proportional relationship, and the current value and the current value increase in the direction in which the air volume is reduced (dust accumulates). Both input power values drop.
[0005]
(B) in the figure shows a case where the constant current control is performed by the phase control up to a predetermined air volume. In the phase control, a constant current can be realized by increasing the phase firing time (hereinafter, referred to as a phase angle) on the large air flow (release) side. However, when the phase angle increases, the effective voltage and the effective current decrease, and the power factor deteriorates. Therefore, the current value and the input power value do not have a proportional relationship, and the phase angle decreases (the air volume decreases) and the input power value decreases. Rises. In other words, this indicates that the input is not constant when the constant current control is performed.
[0006]
Further, in the constant phase angle control by the phase control, the motor application voltage is constant, and therefore, the characteristic is equivalent to the characteristic shown in FIG. 3A. This also indicates that the constant input control cannot be realized.
[0007]
On the other hand, there is a conventional example disclosed in Japanese Patent Publication No. 2-30683 for detecting the air volume. According to this, the input control of the motor can be performed without directly detecting the air volume by using the pressure sensor for detecting the negative pressure between the filter and the fan and the motor current detecting means.
[0008]
[Problems to be solved by the invention]
Since the conventional input control device for a vacuum cleaner is configured as described above, there are the following problems. First, in the configuration using the motor current detecting means, the output of the current detecting means realizes the constant current control and the constant phase angle control. However, in this method, keeping the input constant is a characteristic of the phase control. It is difficult, and the input may change depending on the amount of dust and the state of the surface to be cleaned, and the input power of the motor may exceed the regulation depending on the condition. Therefore, it is difficult to keep the input power constant even if the correction is performed using the power supply voltage.
[0009]
In addition, in a configuration in which a pressure sensor for detecting air flow and a voltage detecting means for detecting fluctuations in power supply voltage are added in addition to the current sensor, the number of components is increased, the cost is increased, and the configuration is naturally increased. In addition, there is another problem that the accuracy adjustment and the process for dealing with the cause of failure are complicated by the increase in the number of sensors, and the assembling workability is deteriorated.
[0010]
Furthermore, since the input power of the power brush motor is not taken into account, the possibility of exceeding the input power regulation as the total input power during rotation of the power brush is high, which may cause the power cord to generate heat.
[0011]
The present invention has been made in order to solve the above-described problems, and has proposed a processing method for realizing a reliable and preferable constant input control in a configuration using a phase control unit and a motor current detection unit, This provides an efficient, economical, safe, etc. that does not depend on the amount of dust or the surface to be cleaned, and does not use a pressure sensor or voltage detection means. An object is to obtain an input control device.
[0012]
[Means for Solving the Problems]
An input control device for a vacuum cleaner according to the present invention includes a current detection unit that detects a current flowing through a motor,A predetermined current value and a phase angle corresponding to the current value according to the airflow are stored.Constant current control means,Phase angle vs. target current characteristics for keeping the input power to the motor constant,Corresponding to the phase angleStore the target current valueTarget current control means;Up to the specified attenuation airflowThe constant current control meansIs less than the predetermined attenuation airflowThe target current control meansSelect and output the current valueSwitching means, an output of the switching means and a detection value detected by the current detecting means;And compare the two current valuesMatchDetermine the phase angle to increase or decreaseA phase angle scanning unit; and a phase control unit that controls an input of the motor based on the phase angle determined by the phase angle scanning unit.
[0013]
Also,GoEquipped with a garbage amount / sealing detection means for detecting the amount of dust accumulation and air passage sealing,When the target current control means controls the phase angle to 0,Based on the detection value of the dust amount / sealing detection meansSaidPhase angle scanning meansInput a predetermined phase angle to theControl.
[0014]
Also,MoMotor characteristic detecting means for detecting variations in the input power of the motor,SaidPredetermined constant current control meansNo electricityFlow rateCorrection orChanging constant current value correction meansWhenEquippedWhen the current detection means detects a dust amount of zero, the predetermined current value of the constant current control means is corrected or changed by the constant current value correction means based on the detection value of the motor characteristic detection means.Things.
[0015]
Also,MoDataofMotor characteristic detecting means for detecting a variation in input power;SaidOf garbage / sealing detection meansCompensate threshold orChange the amount of dust / closed detection value correction meansWhenEquipped,
When the dust amount is zero, the threshold value of the dust amount / sealing detection unit is corrected or changed by the dust amount / sealing detection value correcting unit based on the detection value by the motor characteristic detecting unit.Things.
[0016]
A current detecting means for simultaneously detecting currents of the suction motor and the power brush motor;NoteOf mass / sealing detection meansCompensate threshold orPower brush operation correction means to changeWhenEquippedWhen the current of the power brush motor is detected by the current detecting means, the threshold of the dust / sealing detecting means is corrected or changed by the power brush operation correcting means.Things.
[0017]
further,Phase angle constant control means for controlling the phase of the motor fixed at a constant phase angle,When the detection result by the current detection means is out of the target control rangeIn the phase control, the motor is fixed at a fixed phase angle by the phase angle constant control means.Things.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 1 of the present invention, FIG. 2 is a characteristic diagram of air flow, current and input power of a suction motor, and FIG. FIG. 4 is a basic characteristic diagram showing characteristics of angle and input power, FIG. 4 is a basic characteristic diagram showing characteristics of phase angle and current, FIG. 5 is an operation flowchart, and FIG. 6 is an input power characteristic obtained by an input control device of the vacuum cleaner. FIG.
[0019]
In FIG. 1, reference numeral 1 denotes a commercial AC power supply, 2 denotes a suction motor connected to the commercial AC power supply 1 via a bidirectional thyristor 3, and 4 denotes current detection means for detecting a current flowing through the suction motor 2. The current sensor 4a is configured in series with the suction motor 2, and is detected as a voltage by a voltage drop method using a current transformer or a shunt resistor. Reference numeral 5 denotes a power supply unit generated from the commercial AC power supply 1, which is used for a DC power supply or the like of a microcomputer 6 or the like which controls a vacuum cleaner, and has a commercial frequency zero-cross detection circuit 5a therein. .
[0020]
Numeral 7 is a basic characteristic obtained in advance by an experiment or the like and shown in FIGS. 3 and 4. The basic characteristics 7 include an input power characteristic (measured by a measuring instrument not shown) and a current characteristic (measured by a current detecting means) when the suction motor 2 is controlled by changing a phase angle by a phase control means 14 described in detail later. 4). Reference numeral 8 denotes a phase angle versus target current characteristic derived from the basic characteristic 7 and used to keep the input power constant, and is shown in FIG. The description of FIG. 4 will be described later.
[0021]
Reference numeral 9 denotes a target current control unit which stores the phase angle versus target current characteristic 8 as a characteristic data table or an approximate expression derived from the characteristic data table, and stores a target current value at the phase angle. This is a means for implementing constant input power control. On the other hand, reference numeral 10 denotes a constant current control means for realizing control with a predetermined constant current, in which a current value predetermined from the basic characteristic 7 is stored as a fixed value. 11Cut offIs an alternative, PlaceConstant current control means 1 up to constant damping air flow0When the airflow is selected and the airflow becomes equal to or less than the predetermined attenuation airflow, the target current control means 9 is selected and output.
The above-mentioned predetermined damped air flow rate is determined by a preset phase angle from the air flow rate and current characteristics and the phase angle and the current characteristics of the basic characteristics 7 described in detail in FIGS.
[0022]
Reference numeral 12 denotes a phase angle scanning unit to which the output of the switching unit 11 and the output of the current detection unit 4 via the A / D conversion unit 13 are input so as to match the phase angles according to the result of comparison between the input values. Increase or decrease. The result of the phase angle increase / decrease by the phase angle scanning means 12 is fed back to the switching means 11. Reference numeral 14 denotes a phase control unit which operates by obtaining an output of the phase angle scanning unit 12. The phase control is executed by inputting a phase angle to the gate of the bidirectional thyristor 3, and the current state of the phase angle scanning unit 12 is also applied to the phase angle scanning unit 12. The phase angle value is fed back, and stable input power is realized by following the constantly changing air volume. The reference point having a phase angle of 0 is given by inputting the output from the zero-crossing detecting means 5a to the phase controlling means 14.
[0023]
The microcomputer 6 includes a target current control unit 9, a constant current control unit 10, a switching unit 11, a phase angle scanning unit 12, an A / D conversion unit 13, and a phase control unit 14.
[0024]
Reference numeral 15 denotes a switch unit, which inputs operation contents such as input switching and start / stop to the microcomputer 6. A display unit 16 outputs various information such as the operation content.
[0025]
Next, the basic characteristic 7, the phase angle versus target current characteristic 8, and the target control means 9 will be described based on actual experimental results with reference to FIGS. FIG. 2 is a characteristic diagram of the air flow, the current, and the input power of the suction motor. The solid line indicates the target current, and the broken line indicates the input power. In order to realize constant input power control, it is sufficient to set a target current that slightly decreases as the air flow is reduced. This target current setting depends on the air flow (depending on the air path configuration) and motor characteristics. To do so, it is necessary to make settings corresponding to the model of the vacuum cleaner, and at the same time, it is necessary to clarify the value of the air volume. For this purpose, the respective characteristics shown in FIGS. 3 and 4 were obtained by experiments.
[0026]
FIG. 3 is a diagram showing the phase angle and the input power characteristic of the first basic characteristic. The horizontal axis shows the phase angle T (firing angle time) (0 to several milliseconds), and the vertical axis shows the input power. For the sake of explanation, W indicates a characteristic when, for example, a 1300 W motor is used. In addition, five types (100%> a> b> c> d) from 100% of air volume (zero dust) to d% of air volume (large dust) are described using the air volume as a parameter.
[0027]
A phase angle of 0 indicates a 100% energized state (100 V), and indicates an input power of about 1300 W at a phase angle of 0 and a flow rate of 100%. As shown in the figure, the input power decreases as the phase angle increases, and the input also decreases in the direction where the air volume is reduced (the air volume is small) even when the phase angle is fixed to zero. Further, as the air flow increases, the rate at which the input drops as the phase angle increases increases. If, for example, Wm is set (horizontal line) as the target input power value, the set input power corresponds to the target input power from the intersection (Wm100, Wma, Wmb, Wmc, Wmc) between the air volume of 100% and the air volume d%. The determined predetermined phase angle range Tw is obtained. As described above, it is possible to derive the phase angle corresponding to the input power and the air volume set as the targets.
[0028]
FIG. 4 is a diagram showing the characteristics of the phase angle and the current of the second basic characteristic. As for the current, the output of the current detecting means 4 is shown on the vertical axis, and the phase angle on the horizontal axis and the airflow parameter are the same as those in FIG. is there. When the predetermined phase angle range Tw derived in FIG. 3 is designated on the horizontal axis, and the intersections (Wm100, Wma, Wmb, Wmc, Wmd) of the phase angles derived in FIG. A current characteristic Itw (upward curve) at which the input power is constant at each airflow corresponding to the target input power Wm obtained is obtained. As shown in FIG. 18B, when the constant current control is performed by the phase control, the input power and the current value do not have a proportional relationship. The characteristic shows that the curve becomes an upward-sloping curve.
[0029]
The result of deriving the relationship between the phase angle and the current value indicated by the curve Itw is a phase angle-target current characteristic 8 in a predetermined phase angle range Tw. In order to obtain the target input Wm, it suffices to perform phase control so that the relationship between the phase angle and the current value becomes Itw. This relationship is stored in the target current control means 9 and processed by the microcomputer 6. is there.
[0030]
Next, the constant current control means 10 will be described with reference to FIGS. When, for example, Io is set as a constant current value (horizontal line) on the phase angle-current characteristic in FIG. 4, the current flows from Io and an intersection (Io100, Ioa, Iob, Ioc, Ioc, Iod) up to an air volume of 100% and an air volume of d%. A predetermined phase angle range Ti corresponding to a fixed value is obtained. Then, a phase angle corresponding to the constant current value and the air flow can be derived. Next, a predetermined phase angle range Ti derived in FIG. 4 is indicated on the horizontal axis on the phase angle-input characteristic in FIG. 3, and intersection points (Io100, Ioa, Iob, When Ioc, Iod) are plotted, an approximately straight line Wti falling to the right is obtained for the phase angle-input power characteristic. Therefore, the constant current control operates with the characteristic that the input power increases as the air flow decreases.
[0031]
Next, the operation will be described with reference to FIG. 1, FIG. 2, FIG. 4, FIG. 5, and FIG. First, the operation flowchart in FIG. 5 will be described in detail using the symbols described on the phase angle-current characteristics in FIG. In step S100, T1s stored as an initial value for the operation of the constant current control means 10 in the phase angle scanning means 12 is set as the initial phase angle value at power-on. As the initial phase angle, as shown in FIG. 4, for example, a phase angle T1s based on the intersection (Io100) of the constant current Io and the airflow 100% characteristic curve is set. Therefore, the switching means 11 at the initial stage is the constant current control means 10ToChoiceYouYou.
[0032]
In step S101, the suction motor 2 is phase-controlled by the phase control means 14 and the bidirectional thyristor 3 based on the phase angle initial value T1s set in step S100. In step S 102, the current flowing through the suction motor 2 that has been subjected to the phase control operation is detected by the current detection unit 4, and the detected value Vout is sent to the phase angle scanning unit 12 via the A / D conversion unit 13.
[0033]
Next, in step S103, the phase angle scanning means 12 compares the fixed set current value Io with the detected value Vout, and if the values are equal, returns to the phase control operation S101 while keeping the phase angle unchanged. Proceed to S104.
[0034]
In the example shown in FIG. 4, the operation is performed with the air flow rate a lower than 100%,BeTherefore, Vout shown in the figure is output. In this state, Io> Vout, which means that the vehicle is operated with a current lower than the predetermined set current. Therefore, the process proceeds to step S104, which is a loop for increasing or decreasing the phase angle.
[0035]
In addition, when the operation is performed at an air flow rate a lower than the standard air flow rate 100% due to dust accumulation or the like, the air flow does not return to 100% if the air flow is dust accumulation. In the case of narrowing or the like, if the curtain is removed from the suction port, the operation returns to 100% of the air flow.
[0036]
In step S104, the phase angle scanning means 12 scans and outputs the phase angle Tout in a direction to increase the phase angle when Vout is larger than Io and to decrease the phase angle when smaller than Vout. In the example shown in FIG. 4, since Io> Vout, the phase angle is reduced and output.
[0037]
In step S105, the switching unit 11 determines whether the Tout increased or decreased in step S104 is larger or smaller than the predetermined phase angle T1e. If it is larger, the process returns to the phase control operation S101, and the steps S101 to S105 are repeated. Thus, the motor is driven at a phase angle Tout satisfying Io = Vout. Conversely, if smaller, the process proceeds to step S105. In the example of FIG. 4, the operation is performed at Tout> T1e because of the operation at the air volume a. Therefore, at this stage, the process returns to step S101 and the loop of the constant current control means 10 is executed. However, when the dust further accumulates due to the operation and decreases to the vicinity of the air volume b, the increased or decreased phase angle Tout <the predetermined phase angle T1e, and the process proceeds to step S106. It is set to be.
[0038]
From step S106, the switching means 11 switches to the target current control means 9 for the purpose of keeping the input power constant. Here, first, T2s is set in the phase angle scanning means 12 as an initial phase angle value at the time of transition to the target current control means 9. As shown in FIG. 4, since the transition point T1e is defined at the intersection Iob of the constant current Io and the air volume b, the phase angle of the intersection Wmb of the target current Itw and the air volume b is set as T2s.
[0039]
Steps S107 and S108 perform the same operations as steps S101 and S102. In step S109, similarly to step S103, the target current value Itw is compared with the detected Vout by the phase angle scanning means 12, and if the values are equal, the phase angle is left unchanged and the process returns to the phase control operation step S107. Proceed to step S110.
[0040]
In step S110, similarly to step S104, the phase angle scanning unit 12 scans the phase angle Tout in a direction to increase the phase angle when Vout is larger or smaller than Itw, and to decrease the phase angle when smaller Vout. And output.
[0041]
In step S111, the switching unit 11 determines whether the Tout increased or decreased in step S110 is larger or smaller than the predetermined phase angle T2b. If smaller, the process returns to the phase control operation step S107 and repeats the steps S107 to S111. As a result, the operation is performed at the phase angle Tout that satisfies Itw = Vout, and the target input power Wm can be obtained by executing the target current control means 9. Conversely, if it is larger, the process returns to step S101. The constant current control means 10 is executed again. The operation returning to step S101 means that, for example, the air volume once drops due to the suction of the curtain or the like, and after the transition to the target current control means 9, when the curtain is released from the suction port, the air volume increases (returns). It plays the role of returning to the means 10.
[0042]
As described above, the phase angle is automatically scanned by the flow repetition operation shown in FIG. 5 so that the constant current value Io and the target current value Itw coincide with the current detection value Vout. The constant control can be realized with the input power Wti at the time of control by 10 and the constant input power Wm at the time of control by the target current control means 9.
[0043]
The timing of the repetition loop is set to a predetermined timing time based on the output of the zero-crossing detecting means 5a, so that a process can always be performed in response to a change in the amount of dust and a change in the state of the surface to be cleaned. Although the phase angle increase / decrease time (scan width) depends on the clock of the microcomputer 6, it is desirable to set the phase angle width based on the minimum time.
[0044]
The method of deriving the phase angle Tout with respect to the target current value Itw is as follows: a method of obtaining the characteristics by mapping the characteristics into a correspondence table (tabulation); and formulating the target current characteristics into a mathematical expression, for example, y = ax +bThere is a system that approximates a linear expression and obtains it by calculation. However, in this case, y is a current value output from the current detecting means 4, x is a phase angle, and a and b are constants.
[0045]
Since the constant current control means 10 has a constant current value, the target current control means9Regardless of whether you select a table or formula,BThis has the effect of reducing the load on the gram capacity.
[0046]
FIG. 6 shows input characteristics obtained according to the first embodiment. The horizontal axis represents the air flow, and the vertical axis represents the input power. The constant current control means 10 from 100% air flow to the air flow b shown in the air flow parameter characteristics in FIGS.9It is a case where it switched to. As shown in the figure, it was confirmed that an input power Wti rising to the left can be obtained at a constant current and a constant input power Wm can be obtained at a target current. The air flow is approximately 1.2m^ThreeThe range of / min or less is a full energization (phase angle 0) region.
[0047]
As described above, since the influence of the decrease in the suction capacity due to the accumulation of dust is small on the large air volume side, constant current control can be performed, and the program can be simplified. On the other hand, on the small air volume side due to dust accumulation, by switching to the target current control means, the input power constant control can be realized with a value not exceeding the input power regulation. Therefore, it is possible to efficiently control the input power according to the amount of dust and the state of the cleaning surface, and further, since there is no need to use a pressure sensor as in the conventional case, cost reduction, durability improvement, and assembly work can be achieved. Performance can be improved.
[0048]
Embodiment 2 FIG.
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a functional block diagram illustrating an input control device of a vacuum cleaner according to Embodiment 2, and FIG. 8 is a diagram illustrating characteristics. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 7, reference numeral 17 denotes a dust amount / sealing detecting unit which receives the current output detected from the current detecting unit 4 via the A / D converter 13 and detects the amount of dust accumulation and the sealing of the suction port. The output signal from the quantity / sealing detection means 17 is output to the phase angle scanning means 12 and the display unit 15.
[0049]
Next, the operation will be described. FIG. 8 is an enlarged view of the input characteristic shown in FIG. 6 on the low air volume side, where the horizontal axis represents the air volume and the vertical axis represents the input power. Wm indicates the input power obtained by the first embodiment, the broken line portion of W0 indicates no control, that is, the input power when the phase angle is 0, and the operation by the target current control means 9 is performed when the phase control is executed. Indicates that the operation is performed at a constant input power, and that when the phase angle becomes 0, the characteristics become the same as in the case of no control. The operation at the phase angle 0 will be described below assuming that the input power is equal to the current value because the input power and the current are in a proportional relationship.
[0050]
The dust amount / sealing detection unit 17 is executed when the target current control unit 9 is operated, that is, when the air conditioner shifts to a low air flow side, that is, a region where the operation is performed with the phase angle being zero. Since the amount of dust that should be reported to the user as the amount of dust accumulated is 90 to 100% and the closed operation is present only when the phase angle is 0, for example, the amount of dust 90%, the amount of dust 100%, the sealed And the like can be set by a predetermined output signal from the current detecting means 4. As shown in the figure, the predetermined current value corresponds to the predetermined air volumes Q1, Q2, and Q3, so that it can be detected at the target air volume. A notification that the 90% garbage amount is almost full and a notification that prompts replacement of the paper pack for a 100% garbage amount are made on the display unit 16. When the current drops to the sealing detection level, a predetermined phase angle is input to the phase angle scanning means 12, and the phase is controlled by the phase control means 14, so that the motor operates in the weak operation indicated by the solid line Wd in the figure to perform the motor protection operation. It is possible to do.
[0051]
As described above, it is possible to control the display of dust amount information and the switching of the motor to weak operation without using a pressure sensor in the event of a notification of a practical dust amount or an abnormality such as a closed operation. It is possible to reduce the cost, improve the durability, and improve the workability of assembly while maintaining.
[0052]
Embodiment 3 FIG.
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 9, 10, and 11. FIG. 9 is a functional block diagram of an input control device for a vacuum cleaner according to Embodiment 3, FIG. 10 is a characteristic diagram showing characteristics of a phase angle and a current, and FIG. 11 is an input power characteristic diagram obtained by the input control device. In the drawings, the same reference numerals are given to the same components as those in the first or second embodiment, and the description thereof will be omitted. In FIG. 9, reference numeral 18 denotes a current output from the current detection means 4 via the A / D converter 13 when the dust amount is zero, and thereby the magnitude of the initial input power of the suction motor 2 (variation in input power) ) Is a constant current value correction means for receiving and outputting the output of the suction motor characteristic detection means 18 and correcting and changing a predetermined set current value Io of the constant current control means 10. The output after correction / change is input to the constant current control means 10.
[0053]
Next, the operation will be described with reference to FIGS. For example, assuming that the armature resistance of the suction motor is standard, when the initial phase angle Ts is output from the phase angle scanning means 12, the intersection point Vsm of the initial phase angle Ts and the standard characteristic of 100% air flow is determined by the current detection means 4. The operation is performed with the set input power in order to detect and match the constant current value Io. It has been experimentally confirmed that a high current flows when the armature resistance is low due to a variation in manufacturing, so that the current characteristic becomes higher than that of the standard time as shown by a broken line in the figure (the relation of V = IR). As a result, when V (phase angle) is fixed, I increases as R decreases. At this time, when the initial phase angle Ts is input, the current is detected at the point Vsh, so that the phase angle scanning means 12 moves in the direction of increasing the phase angle (in the direction of decreasing the voltage) in order to make it coincide with the constant current Io. It stabilizes at the intersection a between the broken line and Io. Therefore, the phase angle moves from the phase angle Ts to Tsh.
[0054]
However, as described in the first embodiment, the constant current control cannot secure the constant input power during the phase control operation. Therefore, as shown in the input power characteristic of FIG. 11, the armature resistance is lower than the standard motor characteristic x. It has been experimentally confirmed that the motor has the characteristic y. That is, a motor having a large input power is operated with a lower input power than a standard motor by the constant current control. As described above, if the input power is to be constant, the virtual curve Ik is also required to rise to the right in FIG. 10, and it is necessary to set a phase angle that realizes a point b where this Ik and the broken line intersect. From this relationship with P = VI, it can be seen that at the intersection a, V is constant and V drops at the intersection I, and at the intersection b, V rises slightly at the intersection I. It can be seen that the input power decreases during the constant Io control.
[0055]
Therefore, the constant current value correcting means 19 is a means for realizing the intersection b in FIG. As a method of obtaining the current value Ios at the intersection b, it can be obtained by the following formula: Ios = Io + k (Vsh-Io). Here, Io is the current value stored in the constant current control means 10, Vsh is the current value when the dust is zero detected by the current detection means 4, and k is the slope of the virtual curve Ik previously derived with the target of constant input power. is there.
[0056]
When the constant current value Ios obtained by this equation is stored in the constant current control means 10 and operated, the operation is performed at the phase angle on the perpendicular to the intersection point b, the characteristic z of FIG. 11 is obtained, and the input power at zero dust coincides. Experiments confirmed that Note that this correction method can also be performed by table mapping in addition to the above-described formula.
[0057]
The suction motor characteristic detecting means 18 detects the current when there is no dust. This method uses an E2PROM (not shown) capable of writing and erasing a line inspection before shipment from a factory and the start of actual use. It is made possible by recording using.
[0058]
As described above, the variation in motor input powerReceivingBy the constant current value correction means, the input power at zero dust (open) can be kept constant even at the time of constant current control, so the suction capacity at the time of opening can be kept constant and stable operation can be realized. it can. Further, the compensating means does not become complicated, and an inexpensive configuration can be realized.
[0059]
Embodiment 4 FIG.
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS.
FIG. 12 is a functional block diagram of an input control device for a vacuum cleaner according to a fourth embodiment, and FIG. 13 is an input power characteristic diagram. In the drawing, the same components as those in the first to third embodiments are denoted by the same reference numerals. The description is omitted. In FIG. 12, reference numeral 20 denotes when the amount of waste is zero.,Receiving the output of the suction motor characteristic detecting means 18 for detecting the magnitude (variation of the input power) of the initial input power of the suction motor 2, the dust amount for correcting / changing the threshold value of the dust / sealing detecting means 17 The output after the correction / change is input to the dust amount / sealing detecting means 17.
[0060]
Next, the operation will be described with reference to FIG. 13 using a 100% air volume operation as an example.
FIG. 13 is an enlarged view of the low air flow side of the input characteristics, and the solid line is the input power obtained in the first and second embodiments. Here, considering the characteristics due to the variation in the input power of the suction motor, for example, when the armature resistance of the motor is low due to manufacturing variation, a high current flows, so as shown by the broken line in the drawing, in the operation region where the phase angle is zero. The input power characteristic becomes higher than the standard time.
[0061]
For example, if the threshold value for notifying the amount of dust in the standard motor is set to G1 derived from the air volume Q1, a motor (dashed line) having a large input power notifies the dust amount by the air volume Q2 drawn perpendicularly from the intersection with G1. Will do. That is, since the amount of dust and airtightness are detected on the small air flow side with the large input power motor and the large air flow side with the small motor, the detection cannot be performed at a constant air flow rate.
[0062]
Therefore, the dust amount / sealing value correcting means 20 is intended as a correcting means capable of detecting the dust amount / sealing with a constant air flow even if the motor input power varies, and a specific correction method will be described with reference to FIG. When the input power of the suction motor is large and the initial phase angle Ts is output from the phase angle scanning means 12, the current is detected at the intersection Vsh of the current characteristic (broken line) of Ts and the large input power. Therefore, ΔI is obtained by an equation of ΔI = Vsh−Io obtained by subtracting the current value at the time of the standard motor from the detected current, and this ΔI is added to the threshold value of dust amount / sealing detection at the time of the standard motor. As a result, a correction threshold value of G1h shown in FIG. 13 is obtained, and since this intersection coincides with the air volume Q1, dust / sealing detection can be performed with the same air volume even when the motor input power varies.
[0063]
As described above, the motor input powerToVariationEven if there isSince the dust amount / sealing value correction means can notify the dust amount and detect the sealing with the same air volume, accurate dust amount / sealing detection becomes possible, and the usability and the motor durability are improved. Further, since a pressure sensor is not required, an inexpensive configuration can be achieved.
[0064]
Embodiment 5 FIG.
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIGS.
FIG. 14 is a functional block diagram of an input control device for a vacuum cleaner according to the fifth embodiment, and FIG. 15 is a characteristic diagram of the air volume and the input power. In the drawing, the same reference numerals are used for the same components as those in the first embodiment. The description is omitted. In FIG. 14, reference numeral 21 denotes a power brush motor connected to the commercial AC power supply 1 via a landing switch 22 and a power brush bidirectional thyristor 23; 24 denotes a power brush motor and a suction motor 2; This is current detection means for simultaneously detecting the flowing current, and the suction motor 2 and the power brush motor 21 are connected in parallel to the current sensor 24a. The ON / OFF information of the landing switch 22 is input to the microcomputer 6, and the power brush bidirectional thyristor 23 is ON / OFF controlled by the switch unit 15 via the microcomputer 6.
[0065]
Reference numeral 25 denotes a current output via the A / D converter 13 from a current detection means 24 for detecting a current flowing through the suction motor 2 and the power brush motor 21. Power brush operation correcting means for correcting / changing the threshold value of the detecting means 17, and the output after the correction / change is input to the dust amount / sealing detecting means 17.
[0066]
Next, the operation will be described.
The operation of the power brush motor 21 is determined by the power brush ON operation from the switch unit 15 by the user, and this ON information turns on the gate of the power brush bidirectional thyristor 23 via the output port of the microcomputer 6. In addition, when the suction port for safety is landed on the cleaning surface, the landing switch 22 is turned on, and the power brush motor rotates for the first time. By inputting the information of the landing switch 22 to the microcomputer 6, it can be determined whether or not the power brush motor is operating. When the power brush motor 21 operates during cleaning, the current detection means 24 detects the current added to the current of the suction motor 2.
[0067]
FIG. 15 is an enlarged view of the example of the input characteristic on the low air volume side, and the solid line is the input power obtained in the first and second embodiments. Even when the current of the power brush motor 21 is added, as in the case where the input power of the suction motor 2 fluctuates to the large side (Embodiment 4), the phase control operation at the time of the target current control means 9 is constant. The input power can be secured, and the input power of the power brush motor 21 appears as a difference during the phase angle zero control. As shown by the broken line in the figure, the input power characteristic is higher than that of the operation of the suction motor 2 alone. If the input power of the power brush motor 21 is, for example, 20 W, the value appears as a characteristic difference.
[0068]
When the threshold value for notifying the amount of dust during the operation of the suction motor 2 is set to Gk derived from the air volume Q1, when the power brush motor 21 is superimposed, the air volume Q2 obtained by drawing a perpendicular from the intersection of the broken line and Gk. Will report the amount of garbage. That is, if the power brush motor 21 operates while the suction motor 2 is operated alone, the amount of dust and airtightness are detected on the small air volume side, so that the air volume cannot be detected at a constant air volume.
[0069]
Therefore, the power brush operation correction means 25 is intended to be a correction means capable of detecting dust / airtightness at a constant air flow even when the power brush motor 21 operates, and a specific correction method is to input the power brush motor in advance. Electric power (current), for example, 20 W is measured, and when the power brush motor 21 operates, this 20 W is added to the threshold value for dust amount / sealing detection. As a result, the correction threshold value Gkh of Gk shown in FIG. 15 is obtained, and the intersection with the broken line coincides with the air volume Q1, so that even if the power brush motor 21 is superimposed, it is possible to detect the amount of dust / sealing with the same air volume. Become.
[0070]
As described above, the current detecting means for simultaneously measuring the input currents of the suction motor 2 and the power brush motor 21 and the power brush operation correcting means at the time of operating the power brush motor 21 allow the two currents to be controlled by one current sensor. And a constant target input power can be secured regardless of the operation of the power brush motor in the phase control region when the target current control means 9 is operating. Since it is possible to detect the airtightness, it is possible to accurately detect the amount of dust / airtightness. Thus, stable operation with constant input power can be realized with an inexpensive configuration, and cleaning efficiency can be improved, usability can be improved, and motor durability can be improved.
[0071]
The current detecting means 24 may be provided on the common side of the suction motor 2 and the power brush motor 21 as shown in FIG.
[0072]
Embodiment 6 FIG.
Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG.
FIG. 17 is a functional block diagram of the input control device for a vacuum cleaner according to the sixth embodiment. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 17, reference numeral 26 denotes a phase for receiving a current output from the current detecting means 4 via the A / D converter 13 and performing phase control fixed at a constant phase angle when an abnormal current outside the target control range is detected. This signal is output to the phase control means 14 and the display unit 16.
[0073]
Next, the operation will be described with reference to FIG.
As shown in the phase angle-current characteristic diagram of FIG. 4, in the control device of the present embodiment, the constant current control means 10 is operated by the current Io, and the target current control means 9 is operated by the current Itw. Therefore, in the operation at each phase angle, the phase angle constant control means 26 detects a current value exceeding a fixed ratio value with respect to the values of Io and Itw, and when the current value falls below the fixed ratio value, By determining that the operation is abnormal, the phase angle is set to at least a value equal to or greater than T1s and output to the phase control means 14 to perform safe low input power operation. Also, the display unit 16 is notified of the abnormal operation. Further, when an abnormal current is detected during the low input power operation, the operation is stopped.
[0074]
As described above, the phase angle constant control means detects abnormal operation such as deterioration of the motor and clogging of foreign matter into the suction air passage and the like, and performs low input power operation with a constant phase angle. In addition, safe driving is possible, and safety, usability, and motor durability can be improved.
[0075]
【The invention's effect】
As described above, according to the present invention, current detection means for detecting a current flowing through a motor,A predetermined current value and a phase angle corresponding to the current value according to the airflow are stored.Constant current control means,Phase angle vs. target current characteristics for keeping the input power to the motor constant,Corresponding to the phase angleStore the target current valueTarget current control means;Up to the specified attenuation airflowConstant current control meansIs less than the predetermined attenuation airflowTarget current control meansSelect and output the current valueA switching unit, and an output of the switching unit and a detection value detected by the current detection unit.And compare the two current valuesMatchDetermine the phase angle to increase or decreaseSince the phase angle scanning means and the phase control means for controlling the input of the motor based on the phase angle determined by the phase angle scanning means are provided, on the large air volume side, the influence of the suction capacity reduction due to the accumulation of dust is small. Thus, constant current control can be performed, and the program can be simplified. On the other hand, on the small air volume side due to dust accumulation, the switching means switches the target current control means.SelectThus, constant input power control can be realized with a value that does not exceed the input power regulation. Therefore, input power can be efficiently controlled according to the amount of dust and the state of the cleaning surface, and cost reduction, durability improvement, and assembly workability can be improved.
[0076]
Also,GoEquipped with a garbage amount / sealing detection means for detecting the amount of dust accumulation and air passage sealing,When the phase angle is controlled at 0 by the target current control means,Phase angle scanning means based on the detection value of the dust amount / sealing detection meansInput a predetermined phase angle to theSince control is performed, it is possible to notify the practical amount of dust and to control the motor to switch to a weak operation in the event of an abnormality such as closed operation, etc., aiming to reduce costs, improve durability, and improve assembly workability while maintaining detection accuracy. be able to.
[0077]
Also,MoMotor characteristic detecting means for detecting variations in the input power of the motor,onePredetermined constant current control meansNo electricityFlow rateCorrection orChanging constant current value correction meansWhenEquippedWhen the amount of dust is detected to be zero by the current detecting means, the predetermined current value of the constant current control means is corrected or changed by the constant current value correcting means based on the detection value of the motor characteristic detecting means.Therefore, even during the constant current control, the suction capacity at the time of opening can be kept constant, and stable operation can be realized.
[0078]
Also,MoDataofMotor characteristic detecting means for detecting a variation in input power;GoOf mass / sealing detection meansCompensate threshold orChange the amount of dust / closed detection value correction meansWhenEquipped,
When the dust amount is zero, the threshold value of the dust amount / sealing detection unit is corrected or changed by the dust amount / sealing detection value correcting unit based on the value detected by the motor characteristic detecting unit.Therefore, even if there is a variation in the motor input power, the amount of dust / sealing can be accurately detected with the same air flow, and the usability and the durability of the motor can be improved.
[0079]
Also, current detecting means for simultaneously detecting the currents of the suction motor and the power brush motor,GoOf mass / sealing detection meansCompensate threshold orPower brush operation correction means to changeWhenEquippedWhen the current of the power brush motor is detected by the current detecting means, the threshold of the dust / sealing detecting means is corrected or changed by the power brush operation correcting means.Therefore, both currents can be detected by one current sensor, control can be performed with a constant target input power regardless of the operation of the power brush motor, and accurate notification of dust amount and airtight detection can be performed with the same air volume. Therefore, it is possible to improve the cleaning efficiency, the usability, and the durability of the motor with an inexpensive configuration.
[0080]
Also,Phase angle constant control means for controlling the phase of the motor fixed at a constant phase angle,When the detection result by the current detection means is out of the target control rangeIn the phase control, the motor is fixed at a constant phase angle by the phase angle constant control means.Therefore, abnormal driving can be detected, and safe driving can be performed while maintaining the suction capability, and safety, usability, and motor durability can be improved.
[Brief description of the drawings]
FIG. 1 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 1 of the present invention.
FIG. 2 is a characteristic diagram showing characteristics of air volume-input power and current in the first embodiment of the present invention.
FIG. 3 is a basic characteristic diagram showing a phase angle-input power characteristic in the first embodiment of the present invention.
FIG. 4 is a basic characteristic diagram showing a phase angle-current characteristic according to the first embodiment of the present invention.
FIG. 5 is an operation flowchart illustrating an input control device of the electric vacuum cleaner according to Embodiment 1 of the present invention.
FIG. 6 is an input characteristic diagram obtained by the input control device of the electric vacuum cleaner according to Embodiment 1 of the present invention.
FIG. 7 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 2 of the present invention.
FIG. 8 is a characteristic diagram showing a characteristic of an air volume-input power according to the second embodiment of the present invention.
FIG. 9 is a functional block diagram illustrating an input control device of a vacuum cleaner according to Embodiment 3 of the present invention.
FIG. 10 is a characteristic diagram showing a phase angle-current characteristic in Embodiment 3 of the present invention.
FIG. 11 is a characteristic diagram showing a characteristic of an air volume-input electric power in Embodiment 3 of the present invention.
FIG. 12 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 4 of the present invention.
FIG. 13 is a characteristic diagram showing a characteristic of an air volume-input electric power according to the fourth embodiment of the present invention.
FIG. 14 is a functional block diagram showing an input control device of a vacuum cleaner according to Embodiment 5 of the present invention.
FIG. 15 is a characteristic diagram showing a characteristic of an air volume-input electric power according to the fifth embodiment of the present invention.
FIG. 16 is a functional block diagram showing another input control device of the electric vacuum cleaner according to Embodiment 5 of the present invention.
FIG. 17 is a functional block diagram illustrating an input control device of a vacuum cleaner according to Embodiment 6 of the present invention.
FIG. 18 is a characteristic diagram showing characteristics of input power of a conventional input control device of a general vacuum cleaner.
[Explanation of symbols]
1 commercial AC power supply, 2 suction motor, 3 bidirectional thyristor,
4, 24 current detecting means, 4a, 24a current sensor,
6 microcomputer, 7 basic characteristics, 8 phase angle vs. target current characteristics,
9 target current control means, 10 constant current control means, 11 switching means,
12 phase angle scanning means, 14 phase control means, 17 dust / sealing detection means,
18 suction motor characteristic detecting means, 19 constant current value correcting means,
20 dust / sealing value correction means, 21 power brush motor,
22 Bidirectional thyristor for power brush motor,
25 power brush operation correction means, 26 constant phase angle control means.

Claims (6)

Current detection means for detecting a current flowing through the motor,
Constant current control means for storing a predetermined current value and a phase angle corresponding to the current value according to the air flow ;
Target current control means for storing a target current value corresponding to a phase angle and a phase angle for making the input power to the motor constant ,
Until the predetermined attenuation air volume of the constant current control means, by selecting the target current control means and equal to or less than a predetermined attenuation air volume, and switching means for outputting the current value,
A phase angle scanning unit that compares the output of the switching unit and the detection value detected by the current detection unit, and determines a phase angle that increases or decreases so that the current values of the two are matched.
An input control device for a vacuum cleaner, comprising: a phase control unit that controls an input of the motor based on the phase angle determined by the phase angle scanning unit. Includes a dust amount / closed detection means for detecting a garbage reservoir volume and the air passage closed,
When the phase angle is controlled at 0 by the target current control means inputs the predetermined phase angle to the phase angle scanning means based on a detection value of the amount of dust / sealing detection means, phase control by said phase control means The input control device for a vacuum cleaner according to claim 1, wherein: A motor characteristic detecting means for detecting the variation of the input power of motors,
And a constant current value correcting means for correcting or changing the predetermined electric current values of the constant current control means,
When the current detection means detects a dust amount of zero, the predetermined current value of the constant current control means is corrected or changed by the constant current value correction means based on the detection value of the motor characteristic detection means. The input control device for a vacuum cleaner according to claim 1, wherein A motor characteristic detecting means for detecting the variation of the input power of motors,
And an amount of dust / sealing detected value correcting means for correcting or changing the thresholds of the amount of dust / sealing detection means,
3. A threshold value of the dust amount / sealing detection means is corrected or changed by the dust amount / sealing detection value correcting means based on a detection value by the motor characteristic detecting means when the dust amount is zero. An input control device for a vacuum cleaner according to the above. Current detection means for simultaneously detecting the currents of the suction motor and the power brush motor;
And a power brush operation correcting means for correcting or changing the thresholds before Kigo Mi weight / closed detection means,
The power brush operation correcting means corrects or changes the threshold value of the dust / sealing detecting means when the current of the power brush motor is detected by the current detecting means. 3. The input control device for a vacuum cleaner according to 2. A phase angle fixed control means for controlling the phase of the motor at a fixed phase angle, and when the detection result by the current detection means is a value outside the intended control range, the motor is fixed by the phase angle fixed control means. 2. The input control device for a vacuum cleaner according to claim 1, wherein the phase control is performed at a fixed phase angle .

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