JP2012217786A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner capable of correcting the output frequency deviation of a current transformer easily in a short period of time by simple circuit constitution, reducing power control accuracy variation and stably securing high suction power consequently.SOLUTION: The vacuum cleaner includes: a power supply frequency detection means; a current detection means 5 having a current transformer (described as CT, hereinafter) and detecting the current of an electric blower 2; and a special mode A for adjustment, for linking the output value of the current detection means 5 or a value calculated from the output value according to a predetermined numerical formula with a power supply frequency and storing it in a nonvolatile storage means 6. During an operation in a normal operation mode, the output value of the current detection means 5 is corrected in the form of taking the frequency deviation of the CT into consideration on the basis of the power supply frequency and the stored value, and an energizing amount to the electric blower 2 is controlled on the basis of the corrected value.

Description

  The present invention relates to a vacuum cleaner that detects a current flowing in an electric blower using a current transformer and controls each load.

  Conventionally, as this type of electric vacuum cleaner, as disclosed in Patent Document 1, one that detects the current of an electric blower with current detection means including a current transformer and controls the power consumption of the electric blower is known. In this type of vacuum cleaner, there is a detection error due to variations in the current detection means including the electric blower, the electrical wiring, and the current transformer. Therefore, the current detection means is corrected to eliminate this detection error.

  The correction work of the current detection means is, for example, that a constant current of a constant frequency (for example, 50 Hz) is passed through the current transformer, and the output signal of the current detection means at that time becomes a predetermined value with respect to the current value. Correction is performed by an adjustment portion provided in the detection means. However, since the current transformer is composed of coils, an output deviation also occurs depending on the power supply frequency.

  Therefore, the variation of the current detection means that can be suppressed by the adjustment described above is only with respect to the power supply frequency (for example, 50 Hz) supplied to the current transformer during the adjustment work of the current detection means, and the other power supply frequency (for example, 60 Hz) is the current. Transformer detection variation (output deviation due to power supply frequency) appears as power control accuracy variation as it is, and as a result, electric blower power consumption variation (suction force, especially maximum suction work rate variation) is the largest factor.

  In view of such a problem, as disclosed in Patent Document 2, a second adjustment unit configured by a variable resistor or a variable capacitor is separately provided, and the output of the current detection unit corresponds to a different frequency of the commercial power supply. It is also possible to adjust the adjusting means so that they are substantially the same.

JP-A-5-95877 Japanese Patent Laid-Open No. 11-178391

  However, in the adjustment method according to Patent Document 2, the reference current is applied at 50 Hz and 60 Hz, for example, and then the adjustment unit performs adjustment while confirming the output value at one power supply frequency (for example, 60 Hz). Since the output value at the other power frequency (for example, 50 Hz) deviates from that at the time of the first measurement, the power frequency must be switched and adjusted many times, and it takes much time and labor. There was a problem that the cost would increase due to the installation of the second adjusting means.

  The present invention solves the above-mentioned conventional problems, and with a simple circuit configuration, easily corrects the output frequency deviation of the current transformer in a short time, reduces power control accuracy variation, and stabilizes the high suction work rate. It is to provide a vacuum cleaner that can be secured.

In order to solve the above-described conventional problems, the present invention describes a main body including an electric blower, operation means for a user to operate / stop, power supply frequency detection means, a current transformer (hereinafter referred to as CT). And a current detection means for detecting the current of the electric blower, and an output value of the current detection means by a predetermined signal input or a value calculated from the output value according to a predetermined formula as a power supply frequency And a special mode A for adjustment stored in a nonvolatile storage means, and during operation in a normal operation mode operated by a user operating the operation means, the power frequency and the storage A vacuum cleaner that corrects the output value of the current detection means in a form that takes into account the frequency deviation amount of CT based on the calculated value and controls the amount of current supplied to the electric blower based on the corrected value is proposed.

  In recent microcomputer-controlled vacuum cleaners, in general, non-volatile storage means is mounted to store various control parameters, operation information, and the like. In the present invention, since the storage means already mounted is used, the second adjustment means becomes unnecessary, and adjustment (parameter storage for correction) is sufficient for each power supply frequency only once. Become.

  As explained in detail in the dependent claims, the correction formula for the output value of the current detection means is not complicated, and it is simple and inexpensive, and the output frequency deviation of the current transformer can be easily adjusted with high accuracy in a short time. It is possible to provide a vacuum cleaner that corrects and reduces power accuracy variation, and thus can stably secure a high suction power.

  The vacuum cleaner of the present invention has a simple and inexpensive circuit configuration, easily corrects the output frequency deviation of the current transformer with high accuracy in a short time, reduces power accuracy variation, and stably secures high suction work rate. The vacuum cleaner which can be provided can be provided.

The circuit block diagram of the vacuum cleaner in Embodiment 1 of this invention Overall perspective view of the vacuum cleaner Load current-current detection means output value relationship diagram of the vacuum cleaner Output value correction process flowchart in the circuit of the vacuum cleaner Control flowchart in the circuit of the vacuum cleaner Airflow-power consumption and suction power ratio diagram of the vacuum cleaner

  A first invention includes a main body including an electric blower, operation means for a user to operate / stop, power supply frequency detection means, and current detection for detecting the current of the electric blower having a current transformer. And an output value of the current detection means by a predetermined signal input or a value calculated according to a predetermined formula from the output value is associated with the power supply frequency and stored in the nonvolatile storage means During operation in a normal operation mode that has a special mode A and is operated by the user operating the operating means, the frequency deviation amount of the current transformer is added based on the power supply frequency and the stored value. The electric vacuum cleaner corrects the output value of the current detection means in a form and controls the energization amount to the electric blower based on the corrected value.

  With this configuration, since the storage means already mounted in the microcomputer-controlled vacuum cleaner is used, the adjustment means becomes unnecessary, and adjustment (parameter storage for correction) can be performed only once for each power frequency. It will be enough.

As explained in detail in the dependent claims, the current transformer output value correction equation is not complicated and can easily correct the output frequency deviation of the current transformer with high accuracy with a simple and inexpensive circuit configuration. In addition, it is possible to provide a vacuum cleaner that can reduce power accuracy variation and thus stably secure a high suction power.

  In the second invention, in particular, in the first invention, the data to be stored in the special mode A is obtained when a predetermined reference current value is input at a reference frequency which is one of the power supply frequencies of 50 Hz / 60 Hz. The stored value a, which is an output value of the current detection means, and the stored value b, which is the difference between the stored value a and the output value when the same reference current value is input at the other power frequency. It is a vacuum cleaner.

  As a result, since the frequency deviation of the output value is stored, the output correction in the normal operation mode can be performed with a simple calculation formula, and the output value of the reference frequency is also stored. By following the correction formula in the invention, correction at an air flow point away from the reference current value is also possible.

  The third invention is a stored value that is a value obtained by correcting the output value of the current detection means according to the range of the following expression 1 by a predetermined signal input, in particular, in the first or second invention, separately from the special mode A. The vacuum cleaner has a special mode B for adjustment that stores c in a non-volatile storage means.

(Formula 1)
(When the power supply frequency is the reference frequency) Storage value c = Output value (When other than the reference frequency) Storage value c = Output value−Storage value b × Output value ÷ (Storage value a + Storage value b)
As a result, as described in “Background Art”, in recent vacuum cleaners, there is a case where adjustment is performed to correct the variation of the entire device. Even in this case, the value corrected according to the range of Equation 1 is used. By memorizing, regardless of the air volume and power supply frequency when performing adjustment in the special mode B, it is possible to perform adjustment with a value that takes into account the CT frequency deviation.

  According to a fourth aspect of the present invention, in particular, in any one of the first to third aspects, the electric blower according to a value obtained by correcting the output value of the current detection means according to the range of the following expression 2 during operation in the normal operation mode. It is a vacuum cleaner which controls the amount of electricity to the.

(Formula 2)
(When the power supply frequency is the reference frequency) Correction value = Output value (When other than the reference frequency) Correction value = Output value−Storage value b × Output value ÷ (Storage value a + Storage value b)
Thus, by performing the correction according to Expression 2, as described above, high-precision power control can be performed with a value that takes into account the frequency deviation of the CT regardless of the power supply frequency and the air volume.

  In the fifth invention, in particular, in the first invention, the data stored in the special mode A is an output value of the current detection means when a predetermined reference current value is input at each power frequency of 50 Hz / 60 Hz. The vacuum cleaner is characterized in that there are two stored values a ′ and stored values b ′.

  As a result, the same effect as that of the second invention can be expected, but since the output value at each power supply frequency is stored, the stored value calculation in the special mode A is possible with a simple calculation formula.

  The sixth aspect of the invention is a stored value which is a value obtained by correcting the output value of the current detection means according to the range of the following expression 3 by a predetermined signal input, in particular, in the first or fifth aspect, separately from the special mode A. It is a vacuum cleaner having a special mode B for adjustment, in which c ′ is stored in a nonvolatile storage means.

(Formula 3)
(When the power supply frequency is the reference frequency) Storage value c ′ = Output value (When other than the reference frequency) Storage value c ′ = Output value− (Storage value b′−Storage value a ′) × Output value ÷ Storage value b ′
As a result, when performing adjustment to correct the variation of the entire device, the value corrected in accordance with the range of Equation 3 is stored, so that regardless of the air volume and power frequency when performing adjustment in the special mode B, the CT Adjustment can be made with a value that takes into account the frequency deviation.

  The seventh invention is an electric blower according to the value obtained by correcting the output value of the current detection means according to the range of the following expression 4 during operation in the normal operation mode, particularly in the first, fifth and sixth inventions. It is a vacuum cleaner which controls the amount of electricity to the.

(Formula 4)
(When the power supply frequency is the reference frequency) Correction value = Output value (When other than the reference frequency) Correction value = Output value− (Storage value b′−Storage value a ′) × Output value ÷ Storage value b ′
As a result, by performing the correction according to Equation 4, high-accuracy power control can be performed with a value that takes into account the frequency deviation of CT, as described above, regardless of the power supply frequency and the air volume.

  In particular, the eighth invention is the electric vacuum cleaner according to any one of the first to seventh inventions, wherein the memory in the special mode A is stored as a single circuit board and the memory in the special mode B is stored as a finished product.

  Thus, efficient adjustment can be performed by distributing the adjustment process between the special mode B in which adjustment of the finished product is essential and the special mode A that can be adjusted only by the substrate.

  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)
The vacuum cleaner in embodiment of this invention is demonstrated using FIGS. FIG. 2 is an overall perspective view of the electric vacuum cleaner according to the present embodiment. In FIG. 2, the vacuum cleaner main body 21 is provided with an electric blower chamber 22 containing the electric blower 2 at the rear, a dust collection chamber 23 for collecting dust is arranged at the front, and the front of the vacuum cleaner main body 21. Is provided with an intake port 26 to which a connection pipe 25 provided at one end of the hose 24 is detachably connected.

  The other end of the hose 24 is provided with a tip pipe 28 provided with a handle 27 having an operating means 9 for operating the cleaner body 21 while holding it during cleaning. Reference numeral 29 denotes a telescopic extension pipe, the downstream end of which is detachably connected to the tip pipe 28, and the other end incorporates a rotary brush 30 for dusting and a motor 10 for rotationally driving the rotary brush 30. The suction tool 31 is detachably connected. Further, a power cord 13 (not shown) for supplying power to a circuit board 32 built in the cleaner body 21 is provided at the rear of the cleaner body 21 and connected to an outlet (commercial power supply). It has been.

  Next, the configuration of the control circuit will be described with reference to FIG. The commercial power supply 1 includes a zero cross detection circuit 7 (also serving as a power frequency detection means) for detecting a zero cross of the power waveform, a power supply circuit 8 for supplying power to the signal control means 14, an electric blower 2, A motor 10 is connected. The electric blower 2 and the motor 10 are configured to be supplied with power from the commercial power source 1 by turning on the bidirectional thyristor A3 and the bidirectional thyristor B11, respectively.

The bidirectional thyristors A3 and B11 are configured to be phase-controlled by the signal control means 14 via a drive circuit A4 and a drive circuit B12, respectively. The zero cross detection circuit 7 necessary for performing the phase control is connected to the signal control means 14.

  A current transformer 5a (hereinafter referred to as CT5a) is disposed on the power supply line of the electric blower 2, and the CT5a, the rectifier circuit 5b that rectifies the output signal of the CT5a, and the rectified output signal are smoothed. The current detection means 5 is configured by the smoothing circuit 5c that performs the adjustment and the variable resistor 5d that adjusts the output value after the smoothing. Further, the output signal of the current detection means 5 is configured to be input to the signal control means 14, and the signal control means 14 controls the phase of the electric blower 2 according to the output value of the current detection means 5. The angle is determined and control is performed so as to achieve predetermined power consumption (power control by phase control). The signal control means 14 is connected to a non-volatile storage means 6 for storing and referring to each operation parameter of the product.

  The operation of the vacuum cleaner is performed as follows. That is, a power plug (not shown) is inserted into an outlet and the commercial power source 1 is connected to the control device. When the operation means 9 is operated, the electric blower 2 starts rotating and the electric vacuum cleaner starts operation. At this time, the signal control means 14 receives the operation command signal from the operation means 9 and outputs a phase control signal to the bidirectional thyristor A3 and the bidirectional thyristor B11 via the drive circuit A4 and the drive circuit B12. The phase control of the electric blower 2 and the motor 10 is performed. The current flowing through the electric blower 2 is rectified and smoothed by the current detection means 5, input to the A / D terminal of the signal control means 14, and calculated in the signal control means 14. The phase control angle of the electric blower 2 is determined by the calculation result.

Here, the conventional problem will be briefly described again. The output voltage of the current sensing means 5 when connecting the constant current source 15 in FIG. 1 for applying a reference current value I ₀ in CT5a to adjust the current sensing means 5 is as shown in FIG. The output voltage of the current detecting means when given the same reference current value _{I 0} is the frequency deviation of CT5a by power frequency at that time, a different value as _{V 500} and _{V 600} respectively frequency 50Hz and 60 Hz.

Here, even if the variable resistor 5d is adjusted so that the output value of the current detection means 5 at 50 Hz becomes a predetermined voltage (V ₅₀ ), for example, the output value at 60 Hz varies between V ₅₀₀ and V ₆₀₀ . The variation cannot be improved only by V ₆₀ which remains the ratio. Signal control means 14 as described above, in order to phase control the electric blower 2 on the basis of the output value of the current detector 5, the difference between V ₅₀ and V ₆₀ come directly appear as variations in the power control accuracy. Incidentally, the constant current source 15 is an external power source that is connected only when the current detection means 5 is adjusted, and is not incorporated into the main body of the vacuum cleaner.

  Next, an adjustment (correction) method according to this embodiment will be described with reference to FIGS. FIG. 4 is a flowchart of the adjustment process according to the present embodiment, and FIG. 5 is a flowchart of the control. First, adjustment (correction) control will be described with reference to FIG.

  When the commercial power is turned on to the circuit board 32, the power frequency is determined in step 1. The determination of the power supply frequency is performed in two ways of 50 Hz / 60 Hz depending on the appearance period of the zero cross (point that becomes zero volts) of the AC waveform detected by the zero cross detection circuit 7.

Next, at step 2, it is determined whether or not the mode is shifted to the special mode A or the special mode B for adjustment. The transition to the special mode A is performed by applying a voltage to a predetermined input port (not shown) of the signal control means 14, and the transition to the special mode B is a signal input from the operation means 9 of the signal control means 14. This is performed by inputting a predetermined signal (for example, a pulse signal that repeats 0V⇔5V at a frequency of 100 Hz) directly to the port.

  If there is no transition instruction signal input to each of these special modes, the process proceeds to the “normal flow” step 00 as the normal operation mode. When shifting to the special mode A in step 2, the electric blower 2 and the motor 10 are stopped (step 3), and when shifting to the special mode B in step 2, the electric blower 2 is driven at a phase angle of 0 °. The motor 10 stops (step 4).

  In this state, when a storage instruction signal (for example, a pulse signal that repeats 0V⇔5V at a frequency of 50 Hz and is directly applied to the signal input port from the operation unit 9 of the signal control unit 14) is input, A value calculated from the output value of the current detection means 5 according to a predetermined formula is associated with the power supply frequency and stored in the nonvolatile storage means 6. The storage in the storage means 6 is performed by the signal control means, and the calculation is performed according to the mathematical formula shown in Table 1 and stored in the storage area shown in Table 1 depending on which special mode / power supply frequency is used.

  The “CT value” in the table means the output value of the current detection means 5, and the characters in parentheses are those shown in FIG. The “stored value a” is a value stored in the storage area a, and the “stored value b” is a value stored in the storage area b.

In addition to this control, all the data for correcting the CT output frequency deviation can be stored by adjusting (storing) according to the procedure shown in FIG. That is, first, a commercial power supply of 50 Hz is applied to the circuit board 32 with a predetermined input port (not shown) of the signal control means 14 set to the special mode A. After shifting to the special mode A, when a predetermined reference current value I ₀ is applied to the CT and a storage instruction signal is input, the signal control means 14 stores the output value of the current detection means 5 in the storage area a. To do.

  Next, when a commercial power supply of 60 Hz is turned on and a storage instruction signal is input, the difference between the output value of the current detection means 5 and the storage value of the storage area a, that is, the frequency deviation amount in the reference current value is stored in the storage area b. The Since these adjustments (memory) are for storing the frequency deviation amount of the CT, in this embodiment, the circuit board is separately manufactured to distribute the work in the manufacturing process.

  Next, a commercial power supply of 50 Hz is turned on with the circuit board 32 incorporated in the product. When a transition instruction signal to special mode B is input from a connection terminal (not shown) provided at a connection portion between connection pipe 25 and intake port 26, transition to special mode B is performed, and electric blower 2 has phase angle 0. Drive at °. In this state, the opening of the intake port 26 is closed until the power consumption of the product reaches the maximum rating of 1150 W. Finally, when a storage instruction signal is input from the connection terminal (not shown), the output value of the current detection means 5 is stored in the storage area c.

If the above-described adjustment is performed at the power supply frequency of 60 Hz, the value stored in the storage area c is a value according to the formula in Table 1, that is, the output value of the current detection means 5 at 60 Hz is set to the power frequency deviation amount. Since this is the added value, the same value as when adjusted at 50 Hz is stored.

When the inspection equipment on the production line is adjusted so that the reference current value I ₀ applied in the special mode A and the current value I ₁ applied in the special mode B are the same value, “CT Since the value (V ₆₀ ′) ÷ (stored value a (V ₅₀ ) + stored value b (V ₆₅ )) = 1 ″, the 60 Hz stored value (formula) in the special mode B is complicated as shown in Table 1. Needless to say, there is no problem with “CT value (V ₆₀ ′) −stored value b (V ₆₅ ) CT value”.

  On the other hand, in the normal operation mode, it is determined in step 00 whether or not the operation means 9 has been operated. When the “RUN” switch (not shown) is pressed, the operation is started, and when the “OFF” switch (not shown) is pressed, the operation is stopped. Each load control during operation / stop is performed in the next step 02.

  While the operation is stopped, the electric blower 2 and the motor 10 are stopped. During the operation, the electric blower 2 is driven at a predetermined phase angle, and the motor 10 is driven at a phase angle of 0 ° (step 4). The control phase angle of the electric blower 2 is determined in step 3. The control phase angle is determined according to Table 2 below based on the output value of the current detection means 5 and the value stored in the special mode B. At this time, if the power supply frequency is 60 Hz, the control phase angle is Based on the stored value, the phase control angle is determined after correcting according to the following correction formula.

  The “CT value” in the upper correction formula and the table means the output value of the current detection means 5 or a value after correction by the correction formula, and the characters in parentheses in the upper correction formula are as shown in FIG. . “Storage value a” is a value stored in the storage area a, “Storage value b” is a value stored in the storage area b, and “Storage value c” is a value stored in the storage area c. I mean.

  When dust accumulates in the dust collection chamber 23, the amount of air flowing through the electric blower 2 decreases. As the air flow decreases, the current flowing through the electric blower 2 also decreases. However, by performing the above-described phase control, the control phase angle decreases as the air flow decreases, and the amount of current supplied to the electric blower 2 increases. Therefore, a reduction in suction force can be prevented.

  At this time, in order to make the air volume at which the phase control angle is 0 °, that is, 100% energization, and the air volume at which the maximum rating (for example, 1150 W) of the device is substantially the same, the memory in the special mode B is It is effective to perform the air flow with an electric current amount of 100% to the electric blower 2 and power consumption at the maximum rating (for example, 1150 W) of the device. Furthermore, in the present embodiment, power control can be performed in consideration of the amount of frequency deviation of the CT output value. Therefore, at a frequency different from the power supply frequency at the time of adjustment (60 Hz in the present embodiment), the solid line in FIG. In contrast, the control is substantially the same as the 50 Hz control indicated by the broken line, and as a result, a stable high suction work rate can be ensured regardless of the power supply frequency.

As described above, according to the present embodiment, the current detection means 5 is provided by mounting the special mode A.
The output value and frequency deviation amount can be stored and corrected with a simple configuration and simple procedure. Furthermore, since the output value of the reference frequency (50 Hz in the present embodiment) is also stored at the same time as the frequency deviation amount, the air flow point far from the reference current value is calculated by the above-described normal operation mode correction calculation. It is also possible to correct this. (Claims 1 and 2)
Further, in the output value storing step of the current detection means 5 at the maximum power consumption rating (for example, 1150 W) in the special mode B, the output value of the current detection means 5 is corrected based on the stored value in the special mode A. Since the data can be stored, adjustment (storage) taking into account the frequency deviation of CT can be performed regardless of the air volume and power supply frequency in the special mode B. (Claim 3)
Further, even in the normal operation mode, based on the stored values in the special mode A and the special mode B, high-accuracy power control independent of the power supply frequency can be performed (Claim 4). A vacuum cleaner that can be secured stably can be provided.

Moreover, by adjusting the adjustment process between the special mode B in which adjustment of the finished product is essential and the special mode A that can be adjusted only by the substrate, it is possible to perform efficient adjustment in consideration of work balance. (Claim 8)
In the present invention, the contents of Table 1 and the correction equation in the normal operation mode are simply replaced with Table 3 and Lower Correction Formula 2 in the present embodiment. The description of the form is omitted.

  As described above, the vacuum cleaner according to the present invention is controlled based on the output value of the current transformer and is effective for devices that may be used at a plurality of power supply frequencies. It is effective for domestic vacuum cleaners that require high-precision power control to provide a stable rate, and is not only for home use but also for business use and built-in type (central It can be applied to various types of vacuum cleaners.

1 Commercial Power Supply 2 Electric Blower 3 Bidirectional Thyristor A
4 Drive circuit A
5 Current detection means 5a Current transformer (CT)
5b Rectifier circuit 5c Smoothing circuit 5d Variable resistor (adjustment means)
6 Storage means 7 Zero-cross detection circuit 8 Power supply circuit 9 Operating means 10 Motor 11 Bidirectional thyristor B
12 Drive circuit B
DESCRIPTION OF SYMBOLS 14 Signal control means 15 Constant current source 21 Vacuum cleaner main body 22 Electric blower chamber 23 Dust collection chamber 24 Hose 25 Connection pipe 26 Intake port 27 Handle 28 Tip pipe 30 Rotary brush 31 Suction tool 32 Circuit board

Claims (8)

A body containing an electric blower;
Operation means for the user to run / stop;
Power frequency detection means;
Current detecting means for detecting a current of the electric blower having a current transformer;
A special mode A for adjustment that stores the output value of the current detection unit according to a predetermined signal input or a value calculated according to a predetermined mathematical formula from the output value in association with a power supply frequency and stored in a nonvolatile storage unit; Have
During operation in a normal operation mode that is operated by a user operating the operation means, the current detection means is configured in consideration of the frequency deviation amount of the current transformer based on the power supply frequency and the stored value. A vacuum cleaner that corrects an output value and controls an energization amount to the electric blower based on the corrected value. The data stored in the special mode A includes a stored value a that is an output value of the current detection means when a predetermined reference current value is input at a reference frequency that is one of the power supply frequencies of 50 Hz / 60 Hz, and 2. The electric vacuum cleaner according to claim 1, wherein the stored value a is a stored value b which is a difference between the stored value a and an output value when the same reference current value is input at the other power frequency. Apart from the special mode A, a special mode B for adjustment in which a storage value c, which is a value obtained by correcting the output value of the current detection means according to the range of the following expression 1 by a predetermined signal input, is stored in the nonvolatile storage means. The electric vacuum cleaner according to claim 1, wherein the electric vacuum cleaner is provided.
(Formula 1)
(When the power supply frequency is the reference frequency) Storage value c = Output value (When other than the reference frequency) Storage value c = Output value−Storage value b × Output value ÷ (Storage value a + Storage value b) 4. The amount of current supplied to the electric blower is controlled according to a value obtained by correcting the output value of the current detection means according to the range of the following expression 2 during operation in the normal operation mode. Electric vacuum cleaner.
(Formula 2)
(When the power supply frequency is the reference frequency) Correction value = Output value (When other than the reference frequency) Correction value = Output value−Storage value b × Output value ÷ (Storage value a + Storage value b) The data to be stored in the special mode A includes two values, a storage value a ′ and a storage value b ′, which are output values of the current detection means when a predetermined reference current value is input at each power frequency of 50 Hz / 60 Hz. The vacuum cleaner according to claim 1, wherein the vacuum cleaner is provided. Separately from the special mode A, a special mode for adjustment, in which a stored value c ′, which is a value obtained by correcting the output value of the current detection means in accordance with the range of the following expression 3 by a predetermined signal input, is stored in the nonvolatile storage means. The vacuum cleaner according to claim 1, wherein B is included.
(Formula 3)
(When the power supply frequency is the reference frequency) Storage value c ′ = Output value (When other than the reference frequency) Storage value c ′ = Output value− (Storage value b′−Storage value a ′) × Output value ÷ Storage value b ′ During operation in the normal operation mode, the energization amount to the electric blower is controlled according to a value obtained by correcting the output value of the current detection means in accordance with the range of the following expression 4. The vacuum cleaner described.
(Formula 4)
(When the power supply frequency is the reference frequency) Correction value = Output value (When other than the reference frequency) Correction value = Output value− (Storage value b′−Storage value a ′) × Output value ÷ Storage value b ′ The vacuum cleaner according to any one of claims 1 to 7, wherein the memory in the special mode A is stored as a single circuit board and the memory in the special mode B is stored as a finished product.