JPH05305046A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To rarely generate offensive sounds due to the change in the sound of an electric fan by shifting from the control rule of the large input to the control rule of the small input in steps in sequence based on the detected result of a detecting means, and shifting from the control rule of the small input to the control rule of the large input directly to the preset control rule. CONSTITUTION:A drive section control means 55 is provided with a detecting means 56 detecting the wind quantity or the wind pressure in an air duct, a current detecting means 57, an electric fan control means 58, a cleaning motor control means 59, and a traveling motor control means 60. When the control rule of the large input is to be shifted to the control rule of the small input based on the detected result of the detecting means 56, the input of an electric fan F is shifted in steps in sequence via the control rule of a tatami mat. When the control rule of a wooden floor with a small input is to be shifted to the control rule of a carpet with a large input, the input is shifted directly to the control rule of the carpet. Offensive sounds due to the change in the sound of the electric fan F are rarely generated, and the reduction of dust collection hardly occurs even if the erroneous detection of the detecting means 56 occurs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner for controlling an electric blower according to a plurality of control rules.

[0002]

2. Description of the Related Art A conventional electric vacuum cleaner of this type has a plurality of control rules such as a space between plates, a fold, and a carpet according to the air volume or pressure detected by the detection means while changing the input of an electric blower. A configuration is known in which the electric blower is controlled according to the most appropriate control law.

[0003]

However, when cleaning the surface to be cleaned, especially when the carpet is being cleaned, the carpet and the suction port body are adjusted by the force of the operator pressing the suction port body against the carpet. The contact force with and changes, and depending on the detection state, it switches back and forth between a control law with a large input and a control law with a small input, and the amount of change in the sound of the electric blower becomes large, which is very annoying.

Further, depending on the detection state, there is a problem that the control law of the input becomes smaller than necessary and the dust removal becomes worse.

The present invention has been made in view of the above problems, and it is possible to control an electric blower by a plurality of control laws and select an appropriate control law, and at the same time, a jarring noise caused by a change in the sound of the electric blower due to a change in the control law. It is an object of the present invention to provide an electric vacuum cleaner that does not easily generate dust, and does not easily reduce dust removal.

[0006]

The electric vacuum cleaner of the present invention comprises:
An electric motor, an input variable means for selecting an input of the electric motor from any of a plurality of control laws having different values, and changing the input of the electric motor according to the selected control law, and 1 or 2 for detecting a plurality of states. With the above detection means, based on the detection result of this detection means, when transitioning from a large control law of input to a small control law, sequentially transition in stages,
When shifting from a control law with a small input to a control law with a large input, it directly shifts to a predetermined control law.

[0007]

According to the electric vacuum cleaner of the present invention, when a control law with a large input shifts to a control law with a small input on the basis of the detection result of the detection means, the vacuum cleaner sequentially shifts stepwise, and the control law with a small input has a large control. In the case of shifting to the law, since it shifts directly to the predetermined control law, based on the result detected by the detecting means, when the input rises, it directly shifts to the desired control law, but when the input falls. Since the control law shifts in stages,
The change in the sound of the electric blower is less likely to cause annoyance to the ears, and the dust removal is less likely to occur.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric vacuum cleaner of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes an electric vacuum cleaner body. The electric vacuum cleaner body 1 has a built-in electric blower F shown in FIG. 1, and a base end of a hose 2 communicating with the electric blower F is detachable. The hose 2 is provided with a hand operation unit 3 having a shape branched toward the rear.
A suction port main body 5 is attached to the tip of the hand operation unit 3 via a stretchable extension tube 4.

As shown in FIG. 3, the hand operation section 3 is branched rearward so that the free end portion is a grip portion.
11, the upper surface of the hand operation part 3 extends from the grip 11 to the extension pipe 4
A button 12 for stop setting, a button 13 for automatic setting, a button 14 for weak / strong setting, an indicator 15 constituting a display means, and a button 16 for power brush setting are sequentially arranged in a line in a direction. It is arranged.

Next, the suction port body 5 will be described with reference to FIG.

The suction port body 5 is formed by a lower case body 21 and an upper case body (not shown). Then, in front of the lower case body 21, a partition wall 22 provided in a substantially horizontal direction is provided.
The suction chamber 23 is partitioned and formed, and the suction chamber 23 has an opening on the lower surface, and the inside of the suction chamber 23 has a cylindrical cleaning blade.
24 is rotatably supported, and a pulley 25 is formed at one end of the cleaning blade 24.

Also, on the rear end side, the electric motor storage chamber 26
And the cleaning electric motor B is housed and the cleaning electric motor B is formed.
A drive pulley 28 is provided on the drive shaft 28 of the
A drive belt 31 is hung between the pulley 25 and the drive pulley 29 of 24, and the cleaning motor 24 rotates the cleaning blade 24 in the direction opposite to the traveling direction.

Further, a communication passage 32 which communicates with the suction chamber 23 and the electric vacuum cleaner main body 1 is defined in a substantial center of the lower case body 21, and a communication pipe 33 is vertically rotated in the communication passage 32. Connected freely.

Further, drive wheel chambers 34 each having an open lower surface are formed on both sides of the communication passage 32, and drive wheels 35 are housed in the drive wheel chambers 34, respectively. Then, the pulley 37 provided on the drive shaft 36 coaxial with the drive wheels 35, 35 is normally rotated by the drive belt 38 on the drive shaft 42 of the traveling electric motor W in the traveling direction, that is, the cleaning blade 24. Driven in reverse.

Further, driven front wheel chambers 43, 43 and driven rear wheel chambers 44, 44 are provided at four corners of the suction port body 5. And these driven front wheel chambers 43 and 43 and the driven rear wheel chambers
A driven front wheel and a driven rear wheel (not shown) are rotatably arranged on the wheels 44, 44.

Next, the internal structure will be described with reference to FIG.

First, the electric blower F provided in the electric vacuum cleaner body 1 and the cleaning electric motor B and the traveling electric motor W provided in the suction port body 5 are respectively provided with electric power control triacs 51. , 52, 53 via a commercial AC power supply E. And these triacs 51, 52,
The gate of 53 is connected to a drive unit control means 55 incorporated in the electric vacuum cleaner body 1, and the drive unit control means 55 controls the air volume or pressure in an air passage (not shown) in the electric vacuum cleaner body 1. Detecting means 56 for detecting, current detecting means for detecting current
57, an electric blower control means 58 as an input variable means for controlling the electric blower F, a cleaning electric motor control means 59 as an input variable means for controlling the cleaning electric motor B, and an input variable means for controlling the traveling electric motor W. It has a traveling electric motor control means 60.

Further, the drive section control means 55 is connected to an operation means 62 provided in the hand operation section 3 via a two-wire transmission line 61, and the operation means 62 includes a button 12 for setting a stop and an automatic operation. The current control means 63 for controlling the current in accordance with the operation of the setting button 13, the weak / strong setting button 14 and the power brush setting button 16, the indicator 15 for displaying according to the drive state of the cleaning electric motor B, and this Display control means 64 for controlling the display 15 is provided.

The current threshold value set by the current control means 63 of the operating means 62 and detected by the current detection means 57 of the drive section control means 55 is set as shown in FIG.

The button for this threshold is simply slightly larger threshold i _2, automatically set the threshold i ₁ For the case of a state in which the hose 2 is connected to the threshold i _1, the button 12 for stop setting is operated When 13 is operated, the threshold i ₃ is slightly larger than the threshold i ₂ , and when the weak / strong setting button 14 is operated, the threshold i ₄ is slightly larger than the threshold i ₃ and the power brush setting button 16 is operated. If so, the threshold i ₅ is set to be slightly larger than the threshold i ₄ . Furthermore, a current value larger than the current value when the operation means 62 is short-circuited, etc.
It is designed to maintain the previous state as ₆ .

Next, a specific operation will be described with reference to a flow chart and the like.

First, the time t1 = 0 and the number of times n = 0 are set (step 1), the current is read by the current detecting means 57 (step 2), and the presence or absence of a current equal to or greater than the threshold value i ₁ is detected to detect the hose 2. Presence or absence of connection is detected (step 3). When the current is below the threshold value i _{1, the} space between the two-wire transmission line 61 is released, so it is determined that the hose 2 is disconnected, and the electric blower F is stopped after 1 second (step 4), and n = 1. , A = 0 for not recognizing and b = 0 for recognizing are set (step 5), and the process returns to step 1. At this time, the current detection means
When a current equal to or greater than the threshold value i ₁ is detected at 57, it is determined that the hose 2 is connected, and the process proceeds to the next.

[0024] Then, first, detects whether there is an input pulse button 12 for stop setting or not (step 6), that is, below the threshold i ₃ exceeds the threshold value i ₂ shown in FIG. 5 (c) If the threshold value i ₂ is exceeded and the threshold value i ₃ or less, it is determined that the stop setting button 12 has been operated.
The electric blower F and the cleaning electric motor B shown in (a) and (b) are stopped (step 7), and n = 1, a = 0, b = 0.
Is set (step 8) and the process returns to step 1.

If it is determined in step 3 that the threshold is not lower than i ₃ , it is detected whether or not there is an input pulse of the button 13 for automatic setting (step 9), that is, the threshold i ₃ is exceeded and the threshold i ₄ or lower. If the threshold i ₃ is exceeded and the threshold i ₄ or less, it is determined that the button 13 for automatic setting has been operated, and the electric blower F is automatically operated (step 1
0) and b = 1 are set (step 11), and the process returns to step 1.

If it is determined in step 6 that the threshold value is not less than or equal to the threshold i ₄ , it is detected whether or not there is an input pulse of the button 14 for weak / strong setting (step 12), that is, the threshold i ₄ is exceeded and the threshold i is exceeded. ₅ determines the whether or less, in the case of less than the threshold value i ₅ exceeds the threshold value i ₄ determines that the button 14 for weak / strong setting has been operated, the electric blower F weak or strong is operated (step 13 ), N = 0 is set (step 14), and a =
Set 0 (step 15) and return to step 1.

If it is determined in step 12 that the threshold value is not less than or equal to the threshold value i ₅ , it is detected whether or not there is an input pulse of the power brush setting button 16 (step 16), that is, the threshold value i ₅ is exceeded and the threshold value i ₆ is exceeded. It is determined whether or not
_If it exceeds ₅ and is equal to or less than the threshold i ₆ , it is determined that the power brush setting button 16 has been operated, the cleaning electric motor B is operated (step 17), and the process returns to step 1. Incidentally. When the button 16 for setting the power brush is operated and the electric blower F is not driven, the electric blower F is also driven in the automatic state.

If it is determined in step 16 that the threshold value is not equal to or lower than the threshold value i ₆ , it is determined that the threshold value is the extreme threshold value, the process returns to step 1 to circulate through the loop and enter the standby state, and the previous operation is maintained.

In this way, in the case of the extreme threshold, by maintaining the previous operation, when external noise or a short circuit occurs in the operating means 62 as shown by the pulse N in FIG. 5C, Generally, since the maximum threshold value is reached, the previous operation is maintained without external noise or malfunction even when the operation means 62 is short-circuited.

When the automatic control is selected,
The operation of the flowchart shown in FIG. 7 is performed.

First, it is detected whether or not a = 0 (step 21). If a = 0, that is, if not recognized, M =
One process, that is, a control law process between plates is performed (step 22).

The M process is set as shown in Table 1.

In each control law, the input is continuously changed from the case where a large amount of dust is stored to the case where a small amount of dust is stored.

[0034]

[Table 1] Then, an input variable process of detecting while varying the input of the electric blower F is performed (step 23), and S = 0 is set,
That is, it is set that the process is variable input (step 2
4), it is detected whether or not a = 0 (step 25), and t1
The timer starts counting (step 26) and detects whether b = 0 (step 27). If b = 0 is not detected, it is detected whether t1 has elapsed for 1 second or more (step 2).
8) Return to step 21. In this way, by starting from the input variable time after startup, the input of the electric blower F can be quickly shifted to a desired value.

When b = 0 is determined in step 27, it is determined whether t1 has passed 2 seconds or more (step 29). If t1 has not passed 2 seconds or more, the step is performed. Return to 21. Further, when it is determined in step 29 that t1 has passed 2 seconds or more, it is determined in step 28 that t1 has not passed 1 second or more, and a = 1
Is set (step 30), and when it is determined in step 25 that a = 0 is not satisfied, the timer is timed from t1 = 0 (step 31).

On the other hand, when it is determined in step 21 that the electric blower F is not at the start-up, it is determined whether S = 0, that is, the input variable process (step 32), and the input variable process is performed. If judged, it is judged whether t1 has passed 1 second or more (step 33), and if t1 has not passed 1 second or more, the process returns to step 21. When it is determined in step 33 that t1 has passed for 1 second or more,
The input fixing process for detecting the input of the electric blower F is performed (step 34), S = 1, that is, the input fixing process is set (step 35), and the t2 timer starts counting (step 34). 36), and returns to step 21.

Further, if it is judged in step 32 that S = 0 is not satisfied, that is, it is the input fixing process, it is judged whether or not t2 has passed for 1 second or more (step 37), and t2.
If 1 second or more has not elapsed, the process returns to step 21. If it is determined in step 37 that t2 has passed 1 second or more, the M control law process is performed, the process returns to step 23, and the input variable process is performed again.

According to the flow chart shown in FIG. 7,
At the time of startup, in order to prevent malfunction due to the transient state of the electric blower F and the change in wind generated by the electric blower F,
As shown in FIG. 8, after the input variable state is set for 2 seconds, the input variable state is further continued for 1 second, and thereafter, the input fixed state and the input variable state are alternately repeated every 1 second.

Further, in order to prevent malfunction due to the transient state of the electric blower F and the change in the wind generated by the electric blower F even after switching the operation during operation, as shown in FIG.
After the input variable state is set for 1 second, the input variable state is further continued for 1 second, and thereafter, the input fixed state and the input variable state are alternately repeated every 1 second.

For input variable processing as detection for setting the input to the electric blower F, for example, the operation of the flowchart shown in FIG. 10 is performed.

First, M processing is performed in accordance with the contents shown in Table 1 (step 41), and the detecting means 56 detects whether or not the wind pressure in the air passage is H ≧ H1 (step 42). ≧ H
When it is not 1, that is, when the wind pressure is below H1, Pn1
Processing is performed (step 43). When it is determined that H ≧ H1 in step 42, it is detected whether or not the wind pressure in the air passage is H ≧ H2 (step 44), and when H ≧ H2 is not satisfied, that is, when the wind pressure is H1 or more and H2 or less. , Pn2 processing is performed (step 45). Further, in this way, the wind pressure is detected a plurality of times to detect whether or not the wind pressure in the air passage is H ≧ H9 (step 46). When H ≧ H9 is not satisfied, that is, when the wind pressure is H8 or more and H9 or less. Performs Pn9 processing (step 47), and when the wind pressure is H9, performs Pn10 processing (step 48). The wind pressure H is H1 <H2 <... <H8 <
It is H9.

Further, the input to the electric blower F is in accordance with Table 2 according to the three kinds of control rules, that is, between the plate, the folding, and the carpet.
Is shown in.

[0043]

[Table 2] The relationship between the input of the electric blower F in the variable input state and the wind pressure is as shown in FIG. 11. For example, in the case of carpet cleaning with a small amount of dust, the input rises to Pa and the space between the plates with a small amount of dust is shown. In case of cleaning, it goes up to Pb, and in case of carpet cleaning with a lot of dust, the input goes up to Pc, and in case of cleaning between boards with a lot of dust,
Ascend to Pd.

On the other hand, the relationship between the input and the wind pressure of the electric blower F in the fixed input state is as shown in FIG. 12, and even if the wind pressure changes, the input is kept constant.

As for the input fixing process as the detection by detecting the wind pressure, for example, the operation of the flowchart shown in FIG. 12 is performed.

First, the wind pressure inside the vacuum cleaner body 1 is detected (step 51), and ΔH ₀ = ΔH _MAX is set (step 5).
2) n = 1, that is, it is judged whether or not it has already been detected at least once (step 53), and if it has not been detected at all, then n = 1, that is, the first time (step 53). 54) Then, when it is determined in step 53 that one or more detections have been made, ΔH = ΔH _n is set (step 55), and it is determined whether ΔH _n ≦ ΔH _n-1 (step 55). 56), if ΔH _n ≤ ΔH _n-1 , then ΔH
_n is stored (step 57), and n = n + 1, that is, the number of times is added once (step 58).

Then, n ≧ 10, that is, the number of times is 10
It is judged whether or not the number of times is reached (step 59), and if it is not reached 10 times, the process returns to step 51 and is repeated.

When the number of times reaches 10, ΔH _n ≧ ΔH _A
(Step 60), ΔH _n ≧ ΔH _A
If not, it is further judged whether or not M = 3 at present (step 61). If not M = 3, it is judged to be between the boards and M = 1 is set (step 62), and step 51
Return to. If it is the H _n ≧ ΔH _A in step 60,
It is determined whether or not ΔH _n = ΔH _B (step 63),
When ΔH _n = ΔH _B is not satisfied, that is, it is determined that the fold is as shown in Table 1, M is set to 2 (step 64), and the process returns to step 51. In addition, even if it is determined that M = 3 in step 61, the value is decreased stepwise.
Set M = 2 of 64. Further, in step 63, ΔH _n =
If it is determined to be ΔH _B, it is determined to be sufficient, and M = 3 is set (step 65). In addition, ΔH
_A ≦ ΔH _B.

In this case, unlike the case of the variable input state shown in Table 2, Table 3 is used.

[0050]

[Table 3] FIG. 1 is a flowchart for setting the relationship between the input of the electric blower F and the input of the cleaning electric motor B during automatic setting.
4 will be described.

First, it is detected whether or not the floor surface is rugged (step 71), and if it is determined that the carpet is a carpet, the input of the electric blower F is increased and the input of the cleaning motor B is also increased. (Step 72). If it is determined in step 71 that it is not a carpet, then it is detected whether or not it is a fold (step 73). If it is determined that it is a fold, the input of the electric blower F is reduced and cleaning is performed. The input of the electric motor B is also made small (step 74). When it is determined that the folding is not performed in step 73, the input of the electric blower F is reduced and the input of the cleaning electric motor B is set to 0 between the plates (step 75).

By setting in this way, in particular, the folding operation can be performed quietly, energy can be saved, and the cleaning electric motor B is not swung around.

The input of the cleaning electric motor B during the power brush operation will be described with reference to the flowchart shown in FIG.

First, it is judged whether or not the cleaning electric motor B is driven (step 81), and when the cleaning electric motor B is not driven, whether or not the input of the electric blower F is set to be strong. (Step 82), if it is set to be strong, the input of the cleaning electric motor B is increased (step 83), and then it is checked whether or not the input of the electric blower F is set to weak. If it is determined to be weak (step 84), the input of the electric blower F is reduced (step 8).
5) If it is not weak in step 84, it is set to automatic (step 86).

When the automatic control is selected, the flow chart shown in FIG. 16 may be used instead of the flow chart shown in FIG.

First, it is detected whether or not a = 0 (step 91), and if a = 0, that is, if not recognized, M =
One process, that is, a control law process between plates is performed (step 92). Then, the timing of the t1 timer is started (step
93), it is determined whether t1 has passed 2 seconds or more (step 94). When t1 has passed 2 seconds or more, the process returns to step 91, and when t1 has not passed 2 seconds or more, a = 1
Is set (step 95).

On the other hand, when it is judged at step 91 that a = 0 is not satisfied, it is judged whether t2 has passed 2 seconds or more (step 96). If t2 has not passed 2 seconds or more, Returning to step 91, if t2 has not elapsed for 2 seconds or more, the M control law is performed (step 97), step 95.
Input fixed processing is performed along with the flow from
98), the timer is measured from t2 = 0 (step 9)
9) Return to step 91.

Further, instead of the detection of the wind pressure, for the input fixing processing as the detection by detecting the current of the cleaning electric motor B, for example, the operation of the flowchart shown in FIG. 17 is performed.

[0059] First, to detect the current value of the cleaning motor B (step 101), set to the current value I ₀ = I _{MA X} (step 102), n = 1, i.e., whether already detected at least once It is judged whether or not (step 103), and if it is not detected even once, n = 1, that is, once (step 104), and it is judged at step 103 that one or more times are detected. When it is determined that I = In (step 105), it is determined whether or not In≤In-1 (step 106). If In≤In-1, In is set.
Is stored (step 107) and n = n + 1, that is, the number of times is added once (step 108).

Then, n ≧ 10, that is, the number of times is 10
It is judged whether or not the number has been reached (step 109), and if the number has not been reached 10 times, the process returns to step 101 and is repeated.

When it reaches 10 times, it is judged whether or not In ≥IA (step 110). When it is not In ≥IA, M = M in order to gradually lower the control law.
It is determined whether or not 3 (step 111), and currently M = 3.
If it is not, it is determined that it is between the plates and M is set to 1 (step 112). If it is determined that In ≥IA in step 110, it is determined whether In ≥IB (step 113). ), And if In ≥IB, it is judged that it is a fold, and M is set to 2 (step 114), and In ≥IB
In the case of, it is judged that it is fully folded and M = 3 is set (step 115). Note that IA ≤ IB is set.

As described above, when the control law is changed in the direction of increasing the input, the control law is directly changed to the desired control law,
When the control law is changed in the direction of decreasing the input, the control law is changed stepwise, so that the input of the electric blower F does not increase or decrease sharply, so that the change in the sound hardly causes an offensive sensation. Even if a detection occurs, it is located on the side of the control rule on the large input side, so that it is possible to prevent the dust removal from decreasing.

As the detection means, a dust accumulation detection means for detecting a dust accumulation by wind pressure, a floor surface detection means for detecting a floor type by a change in wind pressure or a current value, and a suction inlet type by a wind pressure are detected. Any means such as a suction port detecting means and a cleaning surface detecting means for detecting the type of the cleaning surface based on a change in wind pressure can be used.

After starting the input variable time, the detection may be continued with the input fixed time being maintained, or the input variable time and the input fixed time may be alternately repeated.

The electric motor is not limited to the electric blower F, but the cleaning electric motor B or the traveling electric motor W can obtain the same effect.

[0066]

According to the electric vacuum cleaner of the present invention, when a control law with a large input shifts to a control law with a small input on the basis of the detection result of the detection means, the control law sequentially shifts step by step and the control with a small input is performed. When the control law shifts to a large control law, the control law directly shifts to a predetermined control law.Therefore, when the input rises, the control law directly shifts to the desired control law, but the input fall In this case, since the control law shifts stepwise, it is possible to prevent the occurrence of annoyance due to the change in the sound of the electric blower and the reduction of dust removal.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an electric vacuum cleaner of the present invention.

FIG. 2 is a perspective view showing an external configuration of the same.

FIG. 3 is a perspective view showing the same hand operating unit.

FIG. 4 is a plan view showing the suction port body with the upper case body removed.

FIG. 5 is a waveform diagram showing a relationship between current values when controlling the electric vacuum cleaner.

FIG. 6 is a flowchart showing the operation of the same electric vacuum cleaner.

FIG. 7 is a flowchart showing an automatic operation of the above electric vacuum cleaner.

FIG. 8 is a timing chart showing a relationship between an input variable state and an input fixed state at the time of starting the same as above.

FIG. 9 is a timing chart showing a relationship between an input variable state and an input fixed state during the same operation.

FIG. 10 is a flowchart showing an operation of an input variable process of the electric vacuum cleaner.

FIG. 11 is a graph showing the relationship between the input and wind pressure of the electric blower in the same input variable state.

FIG. 12 is a flowchart showing an operation of an input fixing process of the same electric vacuum cleaner.

FIG. 13 is a graph showing the relationship between the input and wind pressure of the electric blower in the same input fixed state.

FIG. 14 is a flowchart showing an automatic operation of the electric vacuum cleaner.

FIG. 15 is a flowchart showing the operation of the above cleaning electric motor.

FIG. 16 is a flowchart showing an automatic operation of the electric vacuum cleaner of another embodiment of the same.

FIG. 17 is a flowchart showing an operation of an input fixing process of the electric vacuum cleaner according to the other embodiment.

[Explanation of symbols]

 56 detection means 58 electric blower control means as input variable means 59 cleaning electric motor control means as input variable means 60 traveling electric motor control means as input variable means B cleaning electric motor F electric blower W traveling electric motor

Claims (1)

[Claims] 1. An electric motor, an input variable means for selecting an input of the electric motor from any of a plurality of control laws having different values, and an input variable means for varying the input of the electric motor according to the selected control law, and a plurality of states. One or two or more detecting means for detecting are provided. Based on the detection result of this detecting means, when a control law with a large input shifts to a control law with a small input, the control law sequentially shifts stepwise, and the control law with a small input. The electric vacuum cleaner is characterized in that when it shifts to a large control law, it directly shifts to a predetermined control law.