JPS5949725A - Control apparatus of electric cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a control device for a vacuum cleaner.

Conventional configuration and its problems Conventionally, as a means to detect the suction air volume of a vacuum cleaner,
There is a method in which an obstacle such as a wind catcher plate is installed in the ventilation path, and the suction air volume is determined by the force received by the wind on this obstruction. As a result, airflow changes occur and turbulence occurs. As a result, noise is generated. However, since the airflow detection means detects the airflow through mechanical operation, losses due to frictional resistance of moving parts cannot be ignored, and there are drawbacks such as delay in response to minute changes in airflow and output hysteresis. It was something that I had. Furthermore, there are other methods that detect the suction air volume by detecting the suction pressure of the vacuum cleaner and the voltage applied to the electric motor, but it is difficult to detect the suction pressure, and at present, There are also semiconductor pressure sensors, but semiconductor pressure sensors are expensive and cannot generally be applied to equipment 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 reduces waste by controlling the suction air volume of a vacuum cleaner to an optimal suction air volume according to the load. 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 an electric blower motor, a motor applied voltage detection device for detecting the input voltage of the electric blower, and an output of the rotation speed detection device and the motor applied voltage. A control device for a vacuum cleaner, comprising: a calculation device for inputting the output of the detection device and detecting the suction air volume by calculation; and a motor control device for controlling the output of the motor based on the output of the calculation device; 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.

Figure 1 shows the relationship between the rotational speed of the vacuum cleaner's motor, the suction air volume, and the voltage applied to the motor. 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 01 to Q4 are correlation lines between the motor applied voltage and the motor rotation speed when the suction air of the vacuum cleaner is kept constant.

When using a normal vacuum cleaner, correlation lines Q1 to Q4
can almost be approximated by a straight line, and the mutual spacing between the correlation lines is also approximately proportional to the suction air volume. Therefore, the suction air volume Ω is the motor rotation speed NM1 and the motor applied voltage vM
Then, it can be found by the following formula.

Q=+26VM+β・NM+γ However, α, β, and γ are constants. As both of them understand, the suction air volume of a vacuum cleaner is calculated from the motor applied voltage M and the motor rotation speed N. Therefore, the suction wind Vi of the vacuum cleaner can be easily detected by detecting the rotational speed of the motor and the voltage applied to the motor.

FIG. 2 is a concrete block diagram in 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 motor 1, and 3 detects the 10 rotation speed of the electric motor and is proportional to the rotation speed. 4 is the output of the voltage detection device 2 and 11 is the rotation speed detection device which outputs the rotation speed detection device 3, performs the performance, and outputs the result. 6 is the rotation speed detection device. This is a motor control device (hereinafter referred to as a control 114I device) that controls the output of the electric motor 1 and changes the output of the arithmetic device 4. If the output of the voltage detection device 2 is 7m and the output of the rotation speed detection device is N, then
The relationship between and suction 1ittQ is the same as in Fig. 1, and Q-
a @Vm4-b-N+c.

Here, aebsc is a constant, but it varies depending on the characteristics of the vacuum cleaner. Therefore, the arithmetic unit 3 inputs a-vm-1-bN into the input vm and N.
If you perform the calculation that becomes 10 and output the result, the calculation device 4
will generate an output proportional to the suction air volume. In this way, the voltage detection device 2, the rotation speed detection device 3, and the arithmetic device 4 constitute a suction air volume detection device. The control unit w6 controls the output of the electric motor 1 in accordance with the output of the arithmetic unit 4 so that the suction air volume of the vacuum cleaner reaches a suction air volume suitable for the load.

In this manner, 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
~5 is the same as the actual example 741i in FIG. 2,
Reference numeral 6 denotes a bidirectional gate 4 three-terminal thyristor that controls the current of the motor 1, and 7 a motor applied voltage detection device (hereinafter referred to as "motor applied voltage detection device") that detects the voltage applied to the motor 1V from the voltage between the anode and cathode of the bidirectional three-terminal thyristor θ. 8 is a rotational speed calculation device that inputs the output of the rotational speed detection device 3, performs calculations, and outputs the result; 9 is an applied voltage calculator that inputs the output of the voltage detection device 7, performs calculations, and outputs the result. leopard, device, 1
0 is a comparison calculation device 8 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.
．． Reference numeral 11 denotes a control device which inputs the output of this comparison calculation device 10 and controls the entire output of the electric motor 1 so that the difference between the output of the rotation speed Kn device 8 and the output of the applied voltage calculation device 9 becomes ○. be.

In the above configuration, the voltage detection device 7 does not directly detect the voltage applied to the motor 1, but detects the voltage across the bidirectional three-terminal thyristor 1Q; There is a correlation between the voltage between the cathodes and the applied '+1j voltage of the motor 1, and by detecting the voltage between the anode and cathode of the bidirectional three-terminal thyristor 1o and performing an admonition, an output proportional to the applied voltage of the motor 1 is obtained. be able to.

There is a relationship as shown in Fig. 1 between the suction air volume of a vacuum cleaner, the motor applied voltage, and the motor rotation speed, and the suction air volume Q, the output vm of the voltage detection device 7, and the output of the rotation speed detection device 3 are as follows. Q=a between VN and VN as in the embodiment in FIG.
1. There is a relationship of VN+b1-V, , +c1. Here, al·b 1 + 01 is a constant. 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.

Then, the vacuum cleaner is Q regardless of the load. When operating at a constant suction air volume, the following equation always holds.

Qc'(al・■N+b1・■□+C1) 20 Furthermore, the rotation speed calculating device 8 performs calculations to reduce the input value by 1/a and outputs the result, and the applied voltage calculator [6″9 is the input value v, , +(cl-Qo)l/b and outputs the result. 17 Therefore, the output of the rotational speed calculation device 8 is set to VN1, and the applied voltage calculation device 9 If the output of the vacuum cleaner is Q, regardless of the load, it will always be vN, -vml. Value U:
'1-jjL, the difference between VN1 and vml of the control device 11 is ○
The gate of the bidirectional three-terminal thyristor 6 is controlled so that the output of the motor 1 is controlled.

Therefore, in the above configuration, since the output of the vacuum cleaner is controlled by the control device 11 so that ■N1=■m1, the suction air volume is a constant suction air volume Qc.

In this way, in the configuration shown in Fig. 3, the vacuum cleaner can be easily cleaned by controlling the output of the vacuum cleaner so that the ratio of the rotational speed of the vacuum cleaner's electric motor to the applied voltage of the electric motor is constant. A constant suction air volume control device can be constructed. Moreover, in this case, the arithmetic unit 4 can be configured as a simple multiplier and a comparison arithmetic unit, making it an extremely practical circuit.

Effects of the Invention As described above, according to the present invention, the suction air of a vacuum cleaner does not have any influence on the ventilation path, and is highly stable and has no moving parts. It can be reliably detected by a detection device, and based on this, the vacuum cleaner is operated with an appropriate constant suction air, and the vacuum cleaner is always cleaned with an output suitable for negative A and I. This makes it possible to create highly efficient vacuum cleaners that can

[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 schematic diagram. 1...Electric motor, 2...Motor applied voltage detection device, 3...Rotation speed calculation device, 4...
- Arithmetic device, 5... Motor control device, 7...
Applied voltage detection device, 8... Rotation speed calculation device, 9...
... Applied voltage calculation device, 1Q ... Comparison calculation device, 11 ... Control device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure Motor 1p applied voltage (Vrt) Figure 2

Claims (1)

[Claims] (1) A rotation speed detection device that detects the 1st rotation speed of the blower motor, a motor applied voltage detection device that detects the input terminal of the motor, and the output of the 1r41 rotation speed detection device and the motor applied voltage. A control device for a vacuum cleaner, comprising: an input device that inputs the output of a detection device and detects a suction air volume by calculation; and a motor control device that controls the output of a motor based on the output of the calculation device. (The calculation device includes a detection rotation speed calculation device that calculates and increases the output signal of the rotation speed detection device, an applied voltage calculation device that calculates and increases the output of the motor applied voltage detection device, and a detection rotation speed calculation device that calculates and increases the output signal of the motor applied voltage detection device.) It comprises a comparison device for comparing the output of the device and the output of the applied voltage calculation device, and the motor is configured such that the difference between the output value of the detection rotation speed calculation device and the output value of the applied voltage calculation device always becomes a set value. A control device for a vacuum cleaner according to claim 1, wherein the control device is designed to control an input voltage.