JPS6314979B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a control device for a vacuum cleaner.

Conventional configuration and its problems Conventionally, as a means of detecting the suction air volume of a vacuum cleaner, an obstacle such as a wind catcher plate is provided in the ventilation path, and the suction air volume is detected by the force that this obstruction receives from the wind. However, since the airflow rate detection means is a device that places an obstacle in the ventilation path, airflow changes occur and turbulence occurs. As a result, noise is generated. In addition, since the air volume detection means detects the air volume through mechanical operation, losses due to frictional resistance of moving parts cannot be ignored, resulting in disadvantages such as delay in response to minute changes in air volume and output hysteresis. It had the following characteristics. Furthermore, there are other methods that detect the vacuum cleaner's suction pressure and the voltage applied to the motor to detect the suction air volume, but it is difficult to detect the suction pressure, and currently, semiconductor There are also pressure sensors, but semiconductor pressure sensors are expensive and cannot generally be applied to devices such as vacuum cleaners.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention enables easy detection of the suction air volume with a relatively simple configuration, and also controls the suction air volume of a vacuum cleaner to the optimal suction air volume according to the load, thereby eliminating waste. This realizes a vacuum cleaner with low output.

Composition of the Invention The present invention provides a rotation speed detection device for detecting the rotation speed of a blower motor, a motor applied voltage detection device for detecting the input voltage of the motor, and a detection device for detecting the output of the rotation speed detection device and the motor applied voltage. It is equipped with a calculation device for inputting the output of the device and detecting the intake air volume by calculation, and a motor control device for controlling the output of the electric motor based on the output of the calculation device, and the calculation device has the output of the rotation speed detection device. a detection rotation speed calculation device that calculates and amplifies the signal; an applied voltage calculation device that calculates and amplifies the output of the motor applied voltage detection device;
It comprises a comparison device for comparing the output of the detection rotation speed calculation device and the output of the applied voltage calculation device, and the difference between the output value of the detection rotation speed calculation device and the output value of the applied voltage calculation device is always a set value. The system is configured to control the input voltage of the motor so that the intake air volume is detected based on the relationship between the rotational speed of the motor and the applied voltage, and the air volume is controlled.

Description of examples Examples thereof will be described below with reference to the accompanying drawings.

First, FIG. 1 shows the relationship between the motor rotation speed, suction air volume, and voltage applied to the motor of a vacuum cleaner. The operating principle of the present invention will be briefly explained using this.
In the figure, the horizontal axis of the graph is the motor applied voltage, the vertical axis is the motor rotation speed, and Q ₁ to _{Q 4} are correlation lines between the motor applied voltage and the motor rotation speed when the suction air volume of the vacuum cleaner is kept constant. In normal use of a vacuum cleaner, the correlation lines Q ₁ to _{Q 4} can almost be approximated by straight lines, and furthermore, the mutual spacing between the correlation lines is almost proportional to the suction air volume. Therefore, the suction air volume Q is determined by the following equation, where N _M is the motor rotation speed and V _{M is} the motor applied voltage.

Q=α・V _M +β・N _M +γ However, α, β, and γ are constants. As can be seen from the above equation, the suction air volume of a vacuum cleaner is calculated from the motor applied voltage V _M and the motor rotation speed N _M. Therefore, the suction air volume of a vacuum cleaner can be easily detected by detecting the rotation speed of the electric motor and the voltage applied to the electric motor.

FIG. 2 is a concrete block diagram of one embodiment of the present invention. In the figure, 1 is a blower electric motor, 2 is a motor applied voltage device (hereinafter referred to as a voltage detection device) that outputs an output proportional to the voltage applied to the electric motor 1, and 3 detects the rotation speed of the electric motor 1 and is proportional to the rotation speed. 4 is a calculation device which inputs the output of the voltage detection device 2 and the output of the rotation speed detection device 3 and outputs the result. 5 is a calculation device which outputs the result by inputting the output of the voltage detection device 2 and the output of the rotation speed detection device 3. This is a motor control device (hereinafter referred to as a control device) that controls the current of 1 and changes the output. If the output of the voltage detection device 2 is V _n and the output of the rotation speed detection device is N, then V _n
The relationship between N and suction air volume Q is the same as that shown in FIG. 1, and is determined by Q=a·V _n +b·N+c.

Here, a, b, and c are constants, which are fixed depending on the characteristics of the vacuum cleaner. Therefore, the arithmetic unit 3 calculates the input V _n and N as follows.
By performing the calculation to obtain a·V _n +bN+c and outputting the result, the calculation device 4 will generate an output proportional to the intake air volume. In this way, the voltage detection device 2
By the rotation speed detection device 3 and the calculation device 4,
A suction air volume detection device is configured. Control device 5
In accordance with the output of the arithmetic unit 4, the output of the motor 1 is controlled so that the suction air volume of the vacuum cleaner becomes a suction air volume suitable for the load.

In this way, the above configuration makes it possible to control the suction air volume of the vacuum cleaner.

FIG. 3 is a specific circuit diagram. In the figure,
1 and 3 to 5 are the same as the embodiment shown in FIG. A motor applied voltage detection device (hereinafter referred to as voltage detection device) that detects the voltage applied to the motor 1; 8 is a rotation speed detection device 3;
9 is an applied voltage calculation device that inputs the output of the voltage detection device 7, performs calculations, and outputs the results; 1;
0 is a comparison calculation device which compares the output of the rotation speed calculation device 8 and the output of the applied voltage calculation device 9 and outputs an output proportional to the difference; 11 is a comparison calculation device into which the output of this comparison calculation device 10 is input; This is a control device for controlling the output of the electric motor 1 so that the difference between the output of the motor 8 and the output of the applied voltage calculation device 9 becomes zero. In the above configuration, the voltage detection device 7 does not directly detect the voltage applied to the motor 1, but rather detects the voltage across the bidirectional three-terminal thyristor 10. There is a correlation between the voltage applied to the motor 1 and the voltage applied to the motor 1, and by detecting and calculating the voltage between the anode and cathode of the bidirectional three-terminal thyristor 10, an output proportional to the voltage applied to the motor 1 can be obtained.

The suction air volume of the vacuum cleaner, the voltage applied to the motor,
There is a relationship between _the motor rotation speed as shown in _FIG . As in the example, Q=a ₁・V _N +b ₁・V _n +c ₁
There is a relationship. Here, a ₁ , b ₁ , and c ₁ are constants. When changing the output of a vacuum cleaner depending on the load, one effective method is to control the suction air volume to a constant level. The optimal suction air volume value in this case is Q _c
Then, if the vacuum cleaner is operated with a constant suction air volume of Q _c regardless of the load, the following equation will always hold true.

Q _c − (a ₁ · V _N + b ₁ · V _n + c ₁ ) = 0 Further, the rotation speed calculation device 8 performs calculations on the input value to become 1/a ₁ and outputs the result, and the applied voltage calculation device 9 calculates the input value. It is set to perform the calculation {V _n + (c ₁ −Q _c )}/b on the value and output the result.
Therefore, if the output of the rotation speed calculation device 8 is V _N1 and the output of the applied voltage calculation device 9 is V _n1 , then if the vacuum cleaner has a suction air volume of Qc regardless of the load, then
It is always V _N ,=V _n1 . Comparison calculation device 10 is V _N1
The controller ₁₁ outputs a value proportional to the difference between
controls the gate of the bidirectional three-terminal thyristor 6 so that the difference between V _N1 and V _n1 becomes 0, and controls the output of the motor 1.

Therefore, in the above configuration, the control device 1
1, the output of the vacuum cleaner is controlled so that V _N1 =V _n1 , so the suction air volume becomes a constant suction air volume of Q _c .

In this way, in the configuration shown in Figure 3,
A constant suction air volume control device for a vacuum cleaner can be easily constructed by controlling the output of the vacuum cleaner so that the ratio of the rotation speed of the vacuum cleaner's motor to the voltage applied to the motor is constant. Furthermore, in this case, the arithmetic unit 4 can be constructed from a simple amplification device and a comparison arithmetic device, making it an extremely practical circuit.

Effects of the Invention As described above, according to the present invention, the suction air volume of a vacuum cleaner can be reliably detected with a highly stable detection device that does not have any effect on the ventilation path and does not have any mechanical moving parts. Based on this, the vacuum cleaner can be operated with an appropriate constant suction air volume, and the vacuum cleaner can always be cleaned with the appropriate output for the load, making it possible to realize a highly efficient vacuum cleaner. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between suction air volume, motor rotation speed, and motor applied voltage in a vacuum cleaner, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a circuit diagram. 1... Electric motor, 2... Motor applied voltage detection device, 3
... rotation speed detection device, 4 ... calculation device, 5 ... motor control device, 7 ... applied voltage detection device, 8 ... rotation speed calculation device, 9 ... applied voltage calculation device, 10 ... comparison calculation device, 11 ... control device.

Claims (1)

[Claims] 1. Input a rotation speed detection device for detecting the rotation speed of the blower motor, a motor applied voltage detection device for detecting the input voltage of the motor, and the output of the rotation speed detection device and the output of the motor applied voltage detection device. and a motor control device that controls the output of the motor based on the output of the calculation device, and the calculation device calculates and increases the output signal of the rotation speed detection device. an applied voltage calculation device that calculates and amplifies the output of the motor applied voltage detection device; and a comparison device that compares the output of the detected rotation speed calculation device with the output of the applied voltage calculation device. A vacuum cleaner control device configured to control the input voltage of the motor so that the difference between the output value of the detected rotation speed calculation device and the output value of the applied voltage calculation device always becomes a set value.