JP2010088649A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve such control in a vacuum cleaner as to permit accurate detection of abnormal sparks and also prevention of false detection when the voltage is instantaneously lowered or at the time of power failure by using an inexpensive and simple structure. <P>SOLUTION: The vacuum cleaner includes a current detecting means 5 for detecting alternating currents distributed to an electric fan 2 and a voltage detecting means 15 for detecting the power supply voltage. When there is a period with an undistributed state at least in between half-waves in the alternating current waveforms distributed to the electric fan 2, and when the power supply voltage at the time is at least a prescribed value, the amount of electricity to be distributed to the electric fan 2 is lowered to a prescribed value or the power distribution is stopped. In this way, by detecting a so-called "half-wave missing", the abnormal sparks can be detected based on determination whether the currents are distributed or not, and the possibility of false detection is very low. Furthermore, by using the current detecting means mounted in most vacuum cleaners recently, the inexpensive structure can be achieved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vacuum cleaner using an electric blower composed of a fan and a commutator motor.

One of the problems of this type of vacuum cleaner is motor spark generated from the contact surface between the commutator and the carbon brush. In particular, in motors built in vacuum cleaners, motor sparks are likely to occur due to the severe conditions of use, and once sparks occur, they tend to deteriorate gradually. It is a well-known fact that if this spark becomes large, it will cause various problems such as a significant decrease in life, vibration, malfunction, etc., and the motor itself has been improved as a countermeasure against sparks, but the countermeasures by control are still is needed. Conventional countermeasures of this type include a method of detecting a spark by detecting a high frequency component superimposed on an alternating current waveform when a spark occurs (for example, see Patent Document 1), or a direct detection of a spark by a photodetection element. There is a detection method (for example, see Patent Document 2). In addition, when the occurrence of a spark is detected by these means, it is common to notify the abnormality and stop the motor.
JP 2001-136780 A JP 2006-204470 A

  However, according to the spark determination method described in Patent Document 1, complicated calculation processing is required, and there is a possibility that a spark is erroneously detected even when noise is superimposed on the power supply itself. Furthermore, a high-frequency component superimposed on the current waveform by a light spark of a negligible level (about 3 to 4) and a severe spark (7 to 8: hereinafter referred to as “abnormal spark”). It is very difficult to detect only the abnormal spark that actually leads to a failure. In addition, when trying to detect a spark from an alternating current waveform, an algorithm is required in order to prevent erroneous detection when the power supply waveform itself is disturbed, for example, when an instantaneous voltage drop or an instantaneous power failure occurs.

  In addition, according to the spark determination method described in the above-mentioned Patent Document 2, it is possible to detect with high accuracy, but it is inevitable that the detection becomes expensive, and the arrangement of the light detection elements, the light There is a big problem in realization, such as sensitivity reduction due to contamination of the detection element.

  The present invention solves the above-described conventional problems, and is equipped with a highly accurate spark detection control that detects an abnormal spark with an inexpensive and simple configuration, and also takes into consideration when an instantaneous voltage drop or an instantaneous power failure occurs. A high-quality vacuum cleaner is proposed.

  In order to solve the above-described conventional problems, the present invention changes an electric blower having a fan and a commutator motor, a bidirectional thyristor for driving the electric blower, and a trigger phase angle of the bidirectional thyristor. Control means for controlling the energization amount of the electric blower, current detection means for detecting an alternating current flowing through the electric blower, and voltage detection means for detecting a power supply voltage input to the vacuum cleaner, When there is a period in which at least half of the AC current waveform flowing through the electric blower is not energized and the power supply voltage at that time is equal to or higher than a predetermined value, energization of the electric blower is performed. The amount was reduced to a predetermined amount or the electric blower was stopped.

  Since the occurrence of spark is caused by poor electrical contact between the commutator and the carbon brush, a period in which no current flows intermittently to the electric blower occurs when the spark occurs. The length and period of the period in which no current flows varies depending on the level of the spark. Basically, the larger the spark, the longer the period and period in which no current flows. For this reason, when the spark is small, the harmonic component having a high frequency and a small amplitude is superimposed on the AC power supply waveform, and conversely, when the spark is large, the harmonic component having a low frequency and a large amplitude is superimposed. Become. On the other hand, phase control using a bidirectional thyristor is generally used for the control of the commutator motor. However, when the above-described period in which the current does not flow is longer than the trigger pulse width of the bidirectional thyristor, The directional thyristor is not turned on, and no current flows during the half wave. The present invention detects an abnormal spark by detecting this “half-wave dropout”. The determination can be made based on the determination of “current is flowing / not flowing”, and the possibility of erroneous detection is extremely low. And since it can detect only with the electric current detection means mounted in most recent vacuum cleaners, it can implement | achieve with an inexpensive structure, without adding a new component.

  In addition, the judgment threshold value of “current is not flowing / not flowing” is usually set including variations of components (circuit elements) and cannot be set to zero. When the current is low, there is a case where the current value is less than the determination threshold value even though the current is flowing. In this case, it is erroneously detected that “the current is not flowing”. According to the present invention, when the power supply voltage is less than a predetermined value, the detection of spark is not performed, so that it is possible to completely prevent erroneous detection at the time of instantaneous voltage drop or instantaneous power failure.

  The second to fourth inventions do not use the above-described voltage detection means, and do not detect a spark when an instantaneous voltage drop or an instantaneous power failure occurs. The basic idea is that described above. Is the same.

  The vacuum cleaner of the present invention can realize abnormal spark detection with an inexpensive and simple configuration and extremely low possibility of erroneous detection, and can provide a high-quality vacuum cleaner.

  The first invention is an electric blower having a fan and a commutator motor, a bidirectional thyristor for driving the electric blower, and an energization amount of the electric blower by changing a trigger phase angle of the bidirectional thyristor. AC current flowing through the electric blower, control means for controlling the current, current detection means for detecting an alternating current flowing through the electric blower, and voltage detection means for detecting a power supply voltage input to the vacuum cleaner If there is a period in which at least half of the waveform is not energized in the waveform and the power supply voltage at that time is equal to or higher than a predetermined value, the energization amount to the electric blower is reduced to a predetermined amount, or The electric blower is characterized in that the electric blower is stopped. Since it is a detection of “half-wave missing”, the possibility of erroneous detection is extremely low, and the power supply voltage is a predetermined value. When the full is to become not performed spark detection, erroneous detection when the instantaneous voltage drop and momentary power failure in which completely prevented.

  The second invention is an electric blower having a fan and a commutator motor, a bidirectional thyristor for driving the electric blower, and an energization amount of the electric blower by changing a trigger phase angle of the bidirectional thyristor. There is a period in which at least half of the alternating current waveform flowing in the electric blower is non-energized in the control means for controlling the electric current and the current detection means for detecting the alternating current flowing in the electric blower And when the number of continuous occurrences of the half-wave is less than a predetermined number of times, the electric blower is reduced to a predetermined amount or the electric blower is stopped. Is.

  Normally, even if an instantaneous voltage drop or an instantaneous power failure occurs, the half-wave is not energized.Therefore, the continuous generation of these half-waves that are de-energized is not erroneously detected as a motor spark. When the number of consecutive half-waves that are energized is greater than or equal to a predetermined number, it is determined that there is an instantaneous voltage drop or a power failure, and spark detection is not performed. Normally, when an instantaneous voltage drop or an instantaneous power failure occurs, it takes 0.07 seconds or more to recover. That is, the voltage drop / power failure state continues for about 7 times (50 Hz region) in half-wave. In the present invention, for example, when the predetermined number of continuous occurrences of the half-waves that are not energized is set to 7 and the de-energized state continues for 7 times or more, it is determined that there is an instantaneous voltage drop or a power failure. Thus, the spark detection is not performed, and although the accuracy is inferior to that of the first invention, the voltage detection means is not required, so that it can be configured at a low cost.

  According to a third aspect of the present invention, there is provided an electric blower having a fan and a commutator motor, a bidirectional thyristor for driving the electric blower, and an energization amount of the electric blower by changing a trigger phase angle of the bidirectional thyristor. There is a period in which at least half of the alternating current waveform flowing in the electric blower is non-energized in the control means for controlling the electric current and the current detection means for detecting the alternating current flowing in the electric blower In addition, when the generation distribution of the half-waves in the non-energized state is not extremely biased, and the number of half-waves generated per unit time is equal to or less than a predetermined number, The energization amount is lowered to a predetermined amount or the electric blower is stopped, and the “predetermined number” is set to 50% or more to less than 100% of the full half wave number of the unit time. It is obtained by a vacuum cleaner to.

  Usually, it is very rare that an instantaneous voltage drop or a power failure occurs continuously in a short time. That is, when an instantaneous voltage drop or a power failure occurs, the generation of half-waves in a non-energized state has an extremely biased distribution. The present invention distinguishes instantaneous voltage drop or power outage from sparks according to the distribution. In addition to the distribution, the number of half-waves in a non-energized state is also seen in order to prevent erroneous detection when the voltage drops to the vicinity of the current threshold for non-energization determination. 50% to 100%) is an empirical value, and it is necessary to change the set value depending on the characteristics of the device, but the detection accuracy is higher than that of the second invention.

  A fourth invention is an electric blower having a fan and a commutator motor, a bidirectional thyristor for driving the electric blower, and an energization amount of the electric blower by changing a trigger phase angle of the bidirectional thyristor. A current detecting means for detecting an alternating current flowing through the electric blower, and a current value between at least half waves of the waveform of the alternating current flowing through the electric blower is a first predetermined value. There is a period below and there is no extreme deviation in the distribution of half-waves that is below the second predetermined value, and the number of half-waves generated per unit time is below the predetermined number. The electric blower is turned down to a predetermined amount or the electric blower is stopped, and the "first predetermined value" is set to substantially zero which is a non-energized state. A predetermined value of 2 Is set to a value larger than the “first predetermined value”, and the “predetermined number” is set to 50% to less than 100% of the full half wave number of the unit time. It is.

  By setting the “second predetermined value” to be larger than the “first predetermined value”, the determination of “non-energization” and the determination of “voltage drop” are made more hysteretic. Is complex, but can be detected with higher accuracy.

  In addition to any one of the first to fourth inventions, the fifth invention has an instantaneous power failure detection means for detecting an instantaneous power failure, and a predetermined time elapses after the power failure is detected. Until then, the number of half-waves that are not energized is not counted, and the count value of the half-wave numbers that are de-energized so far is reset. is there.

  When a vacuum cleaner is used, there is a case where the power supply is instantaneously interrupted due to, for example, poor contact between the outlet and the power plug in addition to a normal power failure. In the present invention, these instantaneous interruptions are detected by the instantaneous power failure detection means so as not to perform the spark detection. In general, the instantaneous power failure detection means can be configured at a lower cost than the voltage detection means. Therefore, by combining with the second to fourth inventions, detection with substantially the same accuracy as the first invention can be realized at a low cost. .

  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 the 1st Embodiment of this invention is demonstrated using FIGS. 1-4. 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 incorporating the electric blower 2 at the rear, and dust at the front. A dust collection chamber 23 is disposed, and an intake port 26 is provided at the front of the cleaner body 21 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 having a handle 27 having an operation part 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 scraping dust and a motor 10 for rotationally driving the rotary brush 30. The suction tool 31 is detachably connected. In addition, a power cord 13 for supplying power to a circuit board 32 (not shown) 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. FIG. 3 is a detailed view of the operation unit 9, which includes a “strong” switch 9a, a “medium” switch 9b, a “weak” switch 9c, a “off” switch 9d, and an abnormality display lamp 9e.

  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 8 for detecting a zero-cross of a power supply waveform, a voltage detection means 15 for detecting a power supply voltage, a power supply circuit 7 for supplying power to the signal control means 14, The electric blower 2 and the motor 10 are 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 the drive means A4 and the drive means B12, respectively. The phase control angle at this time is determined in accordance with input signals from the switches 9 a to 9 d of the operation unit 9 connected to the signal control means 14. The zero cross detection circuit 8 required for performing phase control is connected to the signal control means 14. Current detection means 5 is provided on the power supply line of the electric blower 2, and a signal waveform obtained by full-wave rectification of the alternating current waveform of the electric blower 2 is input to the signal control means 14 by the current detection means 5. In addition, a current waveform obtained by smoothing the signal waveform by the peak hold circuit 6 is also input to the signal control means 14. The abnormality display lamp 9e is connected to the signal control means 14, and lights up when an abnormality occurs.

  Next, the operation and action of the electric vacuum cleaner configured as above will be described with reference to FIG.

  The waveforms in FIG. 4 are the power supply voltage waveform, the trigger pulse waveform input to the bidirectional thyristor A3, the current waveform during normal operation, the current waveform during abnormal sparking, and the bidirectional thyristor A3 in the half-wave conduction mode. FIG. 5 is a detailed diagram of the A part of FIG. 4 and shows the power supply voltage waveform, the output waveform of the zero cross detection circuit 8, and the input to the bidirectional thyristor A3 in order from the top. The trigger pulse waveform, the normal current waveform, and the output waveform of the current detection means 5 are shown. When the power is turned on, the trigger pulse is always off, that is, since the electric blower 2 is in a stopped state, the current waveform becomes 0V. When the switches 9a to 9c of the operation unit 9 are pushed by the user's operation, a trigger pulse as shown in the figure is input from the signal control means 14 to the bidirectional thyristor A3 via the drive means A4. As shown in FIG. 5, simultaneously with the trigger pulse input, the bidirectional thyristor A3 is turned on, current flows through the electric blower 2, and the current is cut off at the next zero cross. That is, the current (input) flowing through the electric blower 2 is controlled by changing the phase angle t1 of the trigger pulse (= the time from when the zero cross is detected until the trigger pulse is turned on by the output waveform of the zero cross detection circuit). ing. The signal control unit 14 determines which switch of the operation unit 9 is pressed, determines the phase angle of the trigger pulse so that the electric blower is driven with the target input, and drives according to the pressed switch. A signal is output to the means A3.

  When the “OFF” switch 9d is pressed while the electric blower 2 is being driven, the trigger pulse output from the signal control means 14 is always turned off, and the electric blower 2 is also stopped.

  Hereinafter, an abnormal spark detection algorithm and control after abnormal spark detection will be described with reference to FIG.

  While the electric blower 2 is being driven, the signal control means 14 always outputs the output value of the current detection means 5 and the 90 ° phase 1 ms after the trigger pulse output (timing ▲ 3 in FIG. 5 · t3 = 1 ms). The output value of the voltage detection means 15 is monitored. If the output value of the current detection means 5 is less than 1V, the signal control means 14 determines that “half-wave missing”. If the output value of the voltage detection means 15 at that time is less than 30V, “half-wave” The number of times determined to be “missing” is integrated, and this integrated value is used every second to determine abnormal spark and control after the abnormal spark is determined. Specifically, if the integrated value is 2 times or less, it is judged as “abnormal spark”, and if it is 3 times or more, it is judged as “abnormal spark” and the input of the electric blower 2 is lowered. Control. In FIG. 6, it is determined whether or not the electric blower 2 is being driven in step 2, and if it is being driven, it is determined whether or not “half-wave missing” is determined in step 3, and the power supply voltage is less than 30V. In step 4, the number of “half-wave missing” is integrated. Further, it is determined whether or not the determination timing (every second) is reached in step 5, and if it is the determination timing, in step 6, the “half-wave missing” number integrated value is determined. If the integrated value is 3 times or more, it is determined that “abnormal spark”, the input is lowered, and the abnormality display lamp 9e is turned on.

  As described above, according to the present embodiment, it is possible to configure spark detection at a low cost and with a simple configuration, and since it is detection of “half-wave missing”, the possibility of erroneous detection can be suppressed to a very low level, and the power source When the voltage is low, the number of “half-wave breaks” is not integrated, so that erroneous detection due to power supply voltage drop or instantaneous power failure can be prevented, and “abnormal spark” can be detected with high accuracy.

(Embodiment 2)
Control of the vacuum cleaner in the 2nd Embodiment of this invention is demonstrated using FIG. The overall configuration of the vacuum cleaner in the present embodiment is the same as that of the first embodiment, and the control circuit configuration is the same as that of the first embodiment except that the voltage detection means 15 is omitted. To do.

  While the electric blower 2 is being driven, the signal control means 14 always monitors the output value of the current detection means 5 1 ms after the trigger pulse output (timing ▲ 3 in FIG. 5 · t3 = 1 ms). If the output value of the current detection means 5 is less than 1V, the signal control means 14 determines “half wave missing”, integrates the number of times determined as “half wave missing”, and adds this integrated value every second. Is used to determine the abnormal spark and control after the abnormal spark is determined. Specifically, if the integrated value is 3 times or more and the number of times of “half-wave missing” is continuously less than 7 times, it is determined as “abnormal spark” and the input of the electric blower 2 is Control to lower. In FIG. 6, it is determined whether or not the electric blower 2 is being driven in step 2, and if it is being driven, it is determined whether or not “half-wave missing” is determined in step 3, and the number of “half-wave missing” is determined. Is accumulated. At the same time, in step 4, if “half-wave missing” was also last time, the continuous “half-wave missing” counter is incremented by 1, and in step 5, the maximum number of continuous is updated. Further, in step 6, it is determined whether the determination timing (every second) is reached. If the determination timing is reached, in step 7, the "half-wave missing" number integrated value is determined. In addition, the number of consecutive “half-wave misses” is determined in step 8. If the integrated value is finally 3 times or more and the number of consecutive “half-wave misses” is less than 7, it is judged as “abnormal spark”. Thus, the input is lowered and the abnormality display lamp 9e is turned on.

  Normally, when an instantaneous voltage drop or instantaneous power failure occurs, it takes 0.07 seconds or more to recover. That is, the voltage drop / power failure state continues for 7 times (50 Hz region) in half-wave. Since the present invention uses whether or not the number of consecutive “half-wave misses” is less than 7 in the determination of the abnormal spark, the accuracy is inferior to that of the first invention, but without using the voltage detection means. An abnormal spark detection circuit that can prevent erroneous detection due to instantaneous voltage drop or power failure can be configured at low cost.

  In the present embodiment, if the integrated value is 3 times or more, the integrated value is 3 times or more, and the number of times that “half-wave missing” is continuously determined is less than 7, “abnormal spark. "Is less than 7 times, it is judged as" abnormal spark ", but each number of times is not necessarily limited to this number.

  However, if an instantaneous voltage drop or an instantaneous power failure occurs, it takes 0.07 seconds or more to recover, and the voltage drop / power failure state continues for about 7 times (50 Hz region) in half-wave. Therefore, it is desirable that the number of times that “half-wave missing” is continuously determined is 7 times or more.

(Embodiment 3)
Control of the vacuum cleaner in the third embodiment of the present invention will be described with reference to FIG. The overall configuration of the vacuum cleaner in the present embodiment is the same as that of the first embodiment, and the control circuit configuration is the same as that of the first embodiment except that the voltage detection means 15 is omitted. To do.

  While the electric blower 2 is being driven, the signal control means 14 always monitors the output value of the current detection means 5 1 ms after the trigger pulse output (timing ▲ 3 in FIG. 5 · t3 = 1 ms). If the output value of the current detection means 5 is less than 1.3 V, the signal control means 14 determines that the voltage has dropped and adds up the number of times. Further, if the output value of the current detection means 5 is less than 1V, it is judged as “half-wave missing”, the number of times judged as “half-wave missing” is integrated, and the number of judgments is made every 0.3 seconds. The maximum and minimum values are updated. Furthermore, after this is repeated three times, that is, every 0.9 seconds, the abnormal spark is determined and the control after the abnormal spark is determined is performed using the integrated value and the maximum and minimum values of each determination count. Specifically, the “half-wave missing” integrated value is 3 times or more, and the difference between the maximum value and the minimum value of “half-wave missing” every 0.3 seconds is less than 7 times, that is, “half-wave missing” occurs. If the distribution is not extremely biased and the maximum value of the “low voltage” integrated value every 0.3 seconds is less than 20 times, it is judged as “abnormal spark” and the input of the electric blower 2 is lowered. To control. In FIG. 6, it is determined whether or not the electric blower 2 is being driven in step 2, and if it is being driven, it is determined whether or not it is “low voltage” in step 3 and the number of “low voltage” is integrated. At the same time, it is determined in step 4 whether or not “half-wave missing” has occurred, and the number of “half-wave missing” is integrated. Step 5 is a process of updating the maximum value of the “low voltage” determination count and updating the maximum value and minimum value of the “half-wave dropout” count every 0.3 seconds. Further, in step 6, it is determined whether or not the determination timing (every 0.9), and if it is the determination timing, in step 7, the "half-wave missing" number integrated value is determined. In addition, it is determined in step 8 whether the occurrence distribution of “half-wave missing” is extremely biased by the difference between the maximum value and the minimum value of “half-wave missing” every 0.3 seconds. Further, in step 9, it is determined whether or not the maximum number of occurrences of “low voltage” is less than 20, and finally the “half-wave missing” integrated value for 0.9 seconds is 3 times or more and 0.3 seconds. The difference between the maximum value and the minimum value of each “half-wave missing” is less than 7 times, that is, there is no extreme bias in the distribution of “half-wave missing”, and the maximum “low voltage” integrated value every 0.3 seconds If the value is less than 20 times, it is judged as “abnormal spark”, the input is lowered, and the abnormality display lamp 9e is turned on.

  On the other hand, the detection of the instantaneous power failure is always performed using the zero cross detection circuit 8. Normally, since the zero cross is output in synchronism with the power supply frequency, the zero cross is output every 10 ms in the 50 Hz region and every 8.33 ms in the 60 Hz region. The output cycle of this zero cross is 10 ms / 8 described above. When it becomes longer than 33 ms, it can be determined that there is an instantaneous power failure. Since such an instantaneous power failure detection algorithm is very general, it is not described in the flowchart of the present embodiment. However, immediately after step 1, it is determined that there is an instantaneous power failure and During 100 ms after the power is supplied, a process of continuously resetting all the counters is performed.

  Usually, it is very rare that an instantaneous voltage drop or a power failure occurs continuously in a short time. That is, when an instantaneous voltage drop or a power failure occurs, the generation of half-waves in a non-energized state has an extremely biased distribution. According to the present embodiment, the occurrence distribution of “half-wave missing” is observed by the difference between the maximum value and the minimum value of “half-wave missing” every 0.3 seconds, and “half-wave missing” If the judgment value and the judgment value of “low voltage” have a hysteresis of 0.3 V, and if the number of times of “low voltage” is large, “abnormal spark” is not set, so the “half-wave missing” judgment value is around It is also possible to prevent false detection when the voltage drops. In addition, when an instantaneous power failure is detected, resetting each counter enables false detection in cases where the power supply is instantaneously interrupted due to, for example, poor contact between the outlet and the power plug as well as a normal power failure. Can be prevented and high-precision “abnormal spark detection” can be realized with an inexpensive configuration.

  According to the third aspect of the present invention, in the present embodiment, the “low voltage” determination threshold (1.3 V) is set to the same value as the “half-wave missing” determination value (1 V).

  As described above, the present invention is effective for devices that require countermeasures against motor sparks, particularly electric vacuum cleaners, and is not only for home use but also for built-in type (central cleaner). It can also be applied and deployed in vacuum cleaners.

The circuit block diagram of the vacuum cleaner in Embodiment 1 of this invention Same perspective view of vacuum cleaner Same as above, detail of the operation part of the vacuum cleaner Same as above, current waveform of vacuum cleaner Same detail of current waveform of vacuum cleaner Same as above, control flowchart of vacuum cleaner Control flowchart of electric vacuum cleaner in Embodiment 2 of the present invention Control flowchart of the electric vacuum cleaner in Embodiment 3 of the present invention

Explanation of symbols

1 Commercial Power Supply 2 Electric Blower 3 Bidirectional Thyristor A
4 Driving means A
5 Current detection means 6 Peak hold circuit 7 Power supply circuit 8 Zero cross detection circuit (instantaneous power failure detection means)
9 Operation section 9a “High” switch 9b “Medium” switch 9c “Weak” switch 9d “Off” switch 9e Abnormal indicator lamp 10 Motor 11 Bidirectional thyristor B
12 Driving means B
DESCRIPTION OF SYMBOLS 13 Power cord 14 Signal control means 15 Voltage detection means 21 Vacuum cleaner main body 22 Electric blower chamber 23 Dust collection chamber 24 Hose 25 Connection pipe 26 Intake port 27 Handle 28 End pipe 29 Extension pipe 30 Rotating brush 31 Suction tool 32 Circuit board

Claims (5)

An electric blower having a fan and a commutator motor; a bidirectional thyristor for driving the electric blower; and a control means for controlling an energization amount of the electric blower by changing a trigger phase angle of the bidirectional thyristor. A current detecting means for detecting an alternating current flowing through the electric blower, and a voltage detecting means for detecting a power supply voltage inputted to the electric vacuum cleaner, and at least of the alternating current waveform flowing through the electric blower. When there is a period in which the half-wave is not energized and the power supply voltage at that time is equal to or higher than a predetermined value, the energization amount to the electric blower is reduced to a predetermined amount or the electric blower is stopped. A vacuum cleaner characterized by that. An electric blower having a fan and a commutator motor; a bidirectional thyristor for driving the electric blower; and a control means for controlling an energization amount of the electric blower by changing a trigger phase angle of the bidirectional thyristor. Current detecting means for detecting an alternating current flowing in the electric blower, and there is a period in which at least half of the alternating current waveform flowing in the electric blower is not energized, and half A vacuum cleaner characterized in that, when the number of continuous generations of waves is less than a predetermined number of times, the energization amount to the electric blower is reduced to a predetermined amount or the electric blower is stopped. An electric blower having a fan and a commutator motor; a bidirectional thyristor for driving the electric blower; and a control means for controlling an energization amount of the electric blower by changing a trigger phase angle of the bidirectional thyristor. Current detecting means for detecting an alternating current flowing through the electric blower, wherein there is a period in which at least half of the alternating current waveform flowing through the electric blower is not energized, and the non-current When there is no extreme bias in the distribution of half-waves in the energized state and the number of half-waves generated per unit time is less than or equal to a predetermined value, the energization amount to the electric blower is reduced to a predetermined amount. The electric blower is lowered or the electric blower is stopped, and the “predetermined number” is set to 50% to less than 100% of the full half wave number of the unit time. Removal machine. An electric blower having a fan and a commutator motor; a bidirectional thyristor for driving the electric blower; and a control means for controlling an energization amount of the electric blower by changing a trigger phase angle of the bidirectional thyristor. Current detecting means for detecting an alternating current flowing through the electric blower, and a period in which at least a half-wave current value of the alternating current waveform flowing through the electric blower is equal to or less than a first predetermined value. And there is no extreme bias in the distribution of half-waves that is equal to or less than the second predetermined value, and the number of half-waves generated per unit time is equal to or less than the predetermined number, The amount of current supplied to the electric blower is reduced to a predetermined amount or the electric blower is stopped. The “first predetermined value” is set to substantially zero which is a non-energized state, and the “second predetermined value” is set to “First” To a value greater than the predetermined value ", vacuum cleaner, characterized in that the" predetermined number "is set to 50% or more and less than 100% of the total half-wave number of the unit time. There is an instantaneous power failure detection means for detecting an instantaneous power failure, and from the time when the instantaneous power failure is detected until the power is restored and a predetermined time elapses, the number of half waves that are not energized is not counted, and The vacuum cleaner according to any one of claims 1 to 4, wherein the half-wave count value that has been energized so far is reset.

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