JPH11196596A - Harmonic current attenuator of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the harmonic current attenuator of a motor which attenuates a harmonic current and improve the output of the motor. SOLUTION: The harmonic current attenuator of a motor 30 controls the phase of a sine wave AC power supplied to the motor 30 by a power supply means 10 to adjust the revolution of the motor 30 and has a harmonic current attenuating means which attenuates a harmonic current produced in the phase control of the AC power supply. The harmonic current attenuator further includes an operating means 34 which selects a phase control mode or a high strength mode in accordance with an operation by a user and a switching means 21 which supplies the AC power supplied by the power supply means 10 to the motor 30 through the harmonic current attenuating means if the phase control mode is selected and supplies the AC power supplied by the power supply means 10 directly to the motor if the high strength mode is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a harmonic current attenuator for a motor, and more particularly, to a harmonic current attenuator generated when a vacuum cleaner motor is driven.
The present invention relates to a harmonic current attenuating device for a motor, which is capable of maximizing the output of the motor.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 1, a motor drive circuit in an ordinary vacuum cleaner includes a power supply means (10) for supplying an AC power having a commercial frequency, and a power supply means (10). Filtering means (12) for filtering the noise of the AC power supplied from
A motor (30) driven by AC power supplied from the power supply means (10);
Phase control means (32) for controlling the phase of the AC power supplied from 0) to the motor (30), and a slide switch (34) for adjusting whether or not the motor (30) is driven and the rotation speed by a user's operation. The motor (3) performs a switching operation under the control of the phase control means (32).
0), and a triac for controlling the phase of the AC power supplied to the AC power supply.

Further, the phase control means (32) comprises a capacitor (C), a resistor (R) and a diac, and the diac (DIAC) is supplied through the capacitor (C) and the resistor (R). When the applied voltage exceeds a predetermined voltage (preferably approximately 40 V), the triac is turned on to supply a current to the gate end of the triac, and the triac performs a switching operation by the operation of the diac, so that the power is supplied from the power supply means (10). Motor (3
0) is controlled in phase.

Further, the slide switch (34)
Is composed of a switch (SW), a choke coil (L) and a variable resistor (VR), and the contacts (a, b) of the switch (SW) are mutually connected or opened by a user's operation. In addition to switching the AC power supplied from the power supply means (10) to the motor (30), the variable resistor (VR) is operated by the user.
Is varied to adjust the speed of the motor (30). At this time, the choke coil (L) is a variable resistor (VR)
Is used to filter the high frequency generated when the resistance value changes.

[0005] A motor operation process of the conventional ordinary vacuum cleaner constructed as described above will be described with reference to FIG. First, when the user operates the slide switch (34) to connect the contacts (a, b) of the switch (SW) to each other, the AC power is supplied to the phase control means through the choke coil (L) and the variable resistor (VR). At this time, the noise contained in the AC power supply is filtered through the filtering means (12).

As described above, the filtering means (1)
The AC power filtered through 2) is supplied to the phase control means (32) through the choke coil (L) and the variable resistor (VR), so that the diac in the phase control means (32) turns on and off. By switching the triac by the operation of the diac (DIAC), the phase of the AC power supplied to the motor (30) is controlled.

As described above, the motor (30) is driven by the AC power supplied from the power supply means (10) to the motor (30) through the triac, and the motor (3) is driven.
The internal air is forcibly circulated by the impeller which is rotated in conjunction with the driving of 0), and a pressure difference between the outside and the inside of the cleaner is generated. Due to such a pressure difference, contaminated water such as dust is discharged from the suction port into the inside of the cleaner. The cleaning is performed by being sucked into the air. Here, the voltage (V) supplied to the motor (30)
And the waveform of the current (I) is the same as that shown in FIG.

On the other hand, the triac is switched by the on / off operation of the diac in the phase control means (32), and the sine of the commercial frequency supplied from the power supply means (10) supplied from the power supply means (10) by switching the triac in this way. After the wave voltage is phase-controlled and changed to a non-sinusoidal voltage, it is supplied to the motor (30), so that a harmonic current is generated.

In recent years, as devices such as vacuum cleaners for controlling the phase of an AC power supply supplied to a motor have been widely used, harmonic currents drawn into a power system have been increasing. Harmonic current is used for power capacitors,
In addition to causing an operation failure of a breaker or the like, the transformer may be damaged. Therefore, as a part of preventing the above-mentioned failure due to the harmonic current, the International Electrotechnical Commission (IEC)
The Otechnical Commission) has established a standard to limit harmonic currents.

When the phase of an AC power supply supplied to a motor is adjusted near 90 ° ± 10 °, as in a vacuum cleaner, many harmonic currents are generated. , Three harmonic currents as shown in FIG. Therefore, there is an urgent need to attenuate such three-harmonic current so as to conform to the standard established by the International Electrotechnical Commission. In many technical fields related to vacuum cleaners, attenuating the three-harmonic current. Various researches are being conducted on technology.

As shown in FIG. 4, the above-mentioned technique for attenuating the three harmonic currents includes a "motor harmonic current applied to the Korean Patent Office filed on August 25, 1997 by the same applicant. According to this device, an AC power supply having a commercial frequency supplied from a power supply means (10) is switched by a triac and phase-controlled to a non-sinusoidal voltage, and then a motor (30) is provided. At this time, the motor (3
The harmonic current generated by controlling the phase of the AC power supplied to the power supply 0) is attenuated by the reactor (20) (hereinafter referred to as a harmonic transformer) acting on a kind of resistance component, so that the three harmonic currents are reduced. It can be attenuated effectively.

[0012]

The conventional harmonic current attenuator for a motor as shown in FIG. 4 is designed to attenuate the harmonic current generated during the phase control of the AC power supplied to the motor. Although the AC power is supplied to the motor through the harmonic transformer, even when the motor is driven in the strong mode (Full Power) in which the phase of the AC power supplied to the motor is not controlled, the harmonic transformer acting on the resistance component supplies the motor with the power. Since the voltage of the supplied AC power supply is reduced, the output of the motor becomes a predetermined value (for example,
(Approximately 1400 W) and there is a problem that the suction force is weak.

Accordingly, the present invention has been made to solve the above-mentioned various problems, and an object of the present invention is to attenuate a harmonic current through a harmonic transformer during phase control of an AC power supply supplied to a motor. In addition, when the motor is operated in the strong mode without phase control of the AC power supplied to the motor, the AC power from the power supply means is directly supplied to the motor without passing through the harmonic transformer, so that the motor can be operated. An object of the present invention is to provide a harmonic current attenuating device for a motor capable of improving output.

[0014]

According to the present invention, there is provided a motor harmonic current attenuating device for controlling the phase of a sine wave AC power supplied from a power supply to a motor. To adjust the rotation speed of the motor,
In the harmonic current attenuating device of the motor provided with the harmonic current attenuating means for attenuating the harmonic current generated at the time of the phase control of the AC power supply as described above, a phase control mode or a strong mode is selected by a user operation. Operating means for supplying AC power supplied from the power supply means to the motor through the harmonic current attenuating means when the phase control mode is selected by the operating means, and the power supply means when the strong mode is selected And a switching means for directly supplying AC power supplied from the motor to the motor.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below in detail with reference to the accompanying drawings. Incidentally, the same portions as those of the conventional configuration are denoted by the same names and reference numerals, and detailed description thereof will be omitted.

FIG. 5 is a circuit diagram of a harmonic current attenuating device for a motor according to an embodiment of the present invention, and FIG. 6 is a circuit diagram of a harmonic current attenuating device for a motor according to another embodiment of the present invention. FIG. 7 is a circuit diagram of a harmonic current attenuating device for a motor according to still another embodiment of the present invention. The harmonic current attenuating device for a motor according to the present invention shown in FIGS. As can be seen from the comparison with the conventional harmonic current attenuating device of the motor, the difference between the harmonic current attenuating device of the motor according to the present invention and the harmonic current attenuating device of the conventional motor is that a slide switch ( A contact (b) corresponding to the strong mode is formed at 34), and the contacts (a, b) in the slide switch (34) are mutually connected or opened by a user's operation, so that power supply means is provided. Provided from (10) Or an AC power to be supplied directly to the motor (30), switching means for supplying the motor (30) via a harmonic transformer (20) (21)
Is further provided.

Here, the switching means (21)
As shown in the embodiment of FIG. 5, the contacts (a, b) in the slide switch (34) are connected to each other, or the contacts (h, i) are connected to each other by being opened. Or a micro switch (22) which is opened or opened, and a triac (TRI) is supplied from a power supply means (10) according to the on / off operation of the micro switch (22).
AC power is supplied directly to the motor (30) or supplied to the motor (30) via the harmonic transformer (20).

Further, the switching means (21)
As shown in another embodiment of FIG. 6, whether the contacts (a, b) in the slide switch (34) are connected to each other,
It is embodied as a second triac (TRIAC2) that performs a switching operation by being released, and
AC power supplied from the power supply means (10) through the first triac (TRIAC1) with the switching operation of the triac (TRIAC2) is supplied directly to the motor (30) or via the harmonic transformer (20). It is supplied to a motor (30).

Further, the switching means (21) comprises:
As shown in still another embodiment of FIG. 7, a capacitor (C2) which is supplied with AC power from a power supply means (10) through contacts (a, b) in a slide switch (34) to charge and discharge, and a resistor. (R2)
4) and a second diac (D) that turns on and off according to the voltage supplied through the charging / discharging means (24).
IAC2) and a second triac (TRIAC2) for directly supplying the AC power supplied from the power supply means (10) to the motor (30) when the second diac (DIAC2) is turned on. The AC power supplied from the power supply means (10) when the contacts (a, b) in the slide switch (34) are connected to each other or opened, is supplied directly to the motor (30). ,
The first triac (TRI) is supplied from the power supply means (10).
AC power supplied through AC1) is supplied to the motor (30) via the harmonic transformer (20).

The operation and effect of the harmonic current attenuating device for a motor according to the embodiment of the present invention configured as described above will be described in detail with reference to FIGS. In the initial state, the micro switch (22) is set to the off state. First, in order to control the phase of the AC power supplied to the motor (30), the user operates the slide switch (34) to connect the contact (a) of the switch (SW) to the contacts (c, f). Then, after the AC power supplied from the power supply means (10) is filtered through the filtering means (12),
The AC power supplied to the phase control means (32) and filtered through the filtering means (12) as described above is supplied to the phase control means (32), so that the diac ( DIA
C) turns on and off, and the diac (DIA)
The AC power supplied from the power supply means (10) is phase-controlled by the switching operation of the TRIAC by the operation C).

Further, the AC power whose phase is controlled through the TRIAC is supplied to the motor (30) after the harmonic current generated during the phase control is attenuated while passing through the harmonic transformer (20). The motor (30) is driven. Therefore, the motor (3
The internal air is forcibly circulated by the impeller which is rotated in conjunction with the driving of 0), and a pressure difference between the outside and the inside of the cleaner is generated. The pressure difference causes contaminated water such as dust to be sucked into the cleaner through the suction port. Cleaning is performed.

At this time, with the switch (SW) contact (a) in the slide switch (34) connected to the contacts (c, f), the variable resistor (V) is operated by the user.
The rotation speed of the motor (30) is adjusted by changing the resistance value of R). On the other hand, without controlling the phase of the AC power supplied to the motor (30), the strong mode (Full P
The user operates the slide switch (34) to drive the motor (30) with the power (ower), and the switch (SW) contact (a) in the slide switch (34) is changed to the contact (b,
e) (time t in FIG. 8), the contacts (h, i) of the microswitch (22) are connected to each other.

Therefore, TRIAC (TRIAC)
When the motor (30) is driven in the high-power mode, the AC power supplied through the micro switch (22) is directly supplied to the motor (30) without passing through the harmonic transformer (20) without passing through the harmonic transformer (20). Since the voltage of the AC power supply is not dropped by the harmonic transformer (20) acting in the step (1), the output of the motor (30) is increased to 1600 W or more as shown in FIG.

Next, the operation and effect of the harmonic current attenuating device for a motor according to another embodiment of the present invention will be described in detail with reference to FIGS. In the initial state,
The second triac (TRIAC2) is set to the off state. First, in order to control the phase of the AC power supplied to the motor (30), the user operates the slide switch (34) to connect the contact (a) of the switch (SW) to the contacts (c, f). Then, after the AC power supplied from the power supply unit (10) is filtered through the filtering unit (12), the AC power is supplied to the phase control unit (32), and is filtered through the filtering unit (12) as described above. The AC power supplied to the phase control means (32) is supplied to the diac (DIA) in the phase control means (32).
C) turns on and off, and the diac (DIA)
The first triac (TRIAC1) by the operation of C)
The switching operation of the power supply means (1)
0) is controlled in phase.

Further, the first triac (TRIAC)
The AC power whose phase is controlled through 1) is passed through the harmonic transformer (20), and the harmonic current generated during the phase control is attenuated, and then supplied to the motor (30) to drive the motor (30). You. Therefore, the internal air is forcibly circulated by the impeller rotated in conjunction with the driving of the motor (30), and a pressure difference between the outside and the inside of the vacuum cleaner is generated. Cleaning is performed by being sucked into the vacuum cleaner. At this time, when the switch (SW) contact (a) in the slide switch (34) is connected to each of the contacts (c, f), the resistance value of the variable resistor (VR) is changed by a user operation. Thereby, the rotation speed of the motor (30) is adjusted.

On the other hand, the user operates the slide switch (34) to drive the motor (30) in the powerful mode (Full Power) without controlling the phase of the AC power supplied to the motor (30). , Slide switch (34)
When the switch (SW) contact (a) is connected to the contacts (b, e) (at time t in FIG. 8), the second triac (TRIAC2) is turned on.

Therefore, the first triac (TRI)
AC1) is supplied to the second triac (TRIA) without passing through the harmonic transformer (20).
When the motor (30) is driven in the strong mode by being directly supplied to the motor (30) through C2),
Since the voltage of the AC power supply is not dropped by the harmonic transformer (20) acting on the resistance component, as shown in FIG. 8, the output of the motor (30) is increased to 1600 W or more.

Next, the operation and effects of the motor harmonic current attenuator according to still another embodiment of the present invention will be described in detail with reference to FIGS. In the initial state,
The second triac (TRIAC2) is set to the off state. First, when the user operates the slide switch (34) to control the phase of the AC power supplied to the motor (30) and the contacts (a, c) of the switch (SW) are connected to each other, the power is supplied. Supply means (1
0) is supplied from the filtering means (1).
2) is supplied to the phase control means (32) after being filtered, and the AC power filtered through the filtering means (12) as described above is supplied to the phase control means (32). The first diac (DIAC1) in the means (32) is turned on and off, and the first diac (DIAC1) is turned on and off.
By the operation of 1), the first triac (TRIAC1)
The switching operation of the power supply means (1)
0) is controlled in phase.

Further, the first triac (TRIAC)
The AC power whose phase is controlled through 1) is passed through the harmonic transformer (20), and the harmonic current generated during the phase control is attenuated, and then supplied to the motor (30) to drive the motor (30). You. Therefore, the internal air is forcibly circulated by the impeller rotated in conjunction with the driving of the motor (30), and a pressure difference between the outside and the inside of the vacuum cleaner is generated. Cleaning is performed by being sucked into the vacuum cleaner. At this time, in a state where the switch (SW) contacts (a, c) in the slide switch (34) are connected to each other, the resistance of the variable resistor (VR) is changed by a user operation, so that the motor (30) is changed. ) Speed is adjusted.

On the other hand, the user operates the slide switch (34) to drive the motor (30) in the powerful mode (Full Power) without controlling the phase of the AC power supplied to the motor (30). When the switch (SW) contacts (a, b) in the slide switch (34) are connected to each other (at time t in FIG. 8), the AC power supply comprises a capacitor (C2) and a resistor (R2). (24) and the second
Is supplied to the gate end of the second triac (TRIAC2) through the diac (DIAC2), and the second triac (TRIAC2) is turned on.

Therefore, the AC power supplied from the power supply means (10) is directly supplied to the motor (30) without passing through the harmonic transformer (20), so that the motor (30) is driven in the strong mode. In this case, since the voltage of the AC power supply is not dropped by the harmonic transformer (20) acting on the resistance component, the output of the motor (30) is increased to 1600 W or more as shown in FIG.

At this time, as described above, the capacitor (C2)
And a second diac (DIAC2) by using a charging / discharging means (24) composed of a resistor and a resistor (R2).
Due to the noise of the external power supply, the second triac (TR)
IAC2) can be prevented from malfunctioning.

In particular, in a handle-type vacuum cleaner in which the slide switch (34) is attached to the hose of the vacuum cleaner, the noise of the external power supply is extremely large, so that the second triac (TRIAC2) is likely to malfunction. Are the charging / discharging means (24) comprising the capacitor (C2) and the resistor (R2) as described above;
By using the diac (DIAC2), the noise of the external power supply causes the second triac (TRIC2) to be used.
AC2) can be prevented from malfunctioning.

[0034]

As described above, when the present invention is used,
In addition to attenuating the harmonic current through the harmonic transformer during the phase control of the AC power supplied to the motor, the AC power supplied from the power supply means may be operated in the strong mode without phase control of the AC power supplied to the motor. By directly supplying power to the motor through the switching means without passing through the harmonic transformer, there is an effect that the output of the motor can be improved.

[Brief description of the drawings]

FIG. 1 is a motor drive circuit diagram in a conventional ordinary vacuum cleaner.

FIG. 2 is an explanatory diagram of a harmonic current generated when a conventional normal motor is driven.

FIG. 3 is an explanatory diagram of a harmonic current generated when a conventional normal motor is driven.

FIG. 4 is a diagram of a conventional motor drive circuit provided with a harmonic transformer for attenuating a harmonic current generated when the motor is driven.

FIG. 5 is a circuit diagram of a harmonic current attenuating device for a motor according to an embodiment of the present invention.

FIG. 6 is a circuit diagram of a harmonic current attenuating device for a motor according to another embodiment of the present invention.

FIG. 7 is a circuit diagram of a harmonic current attenuator for a motor according to still another embodiment of the present invention.

FIG. 8 is an explanatory diagram of the output of the motor according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Power supply means 12 Filtering means 20 Harmonic transformer 21 Switching means 22 Micro switch 24 Charge / discharge means 30 Motor 32 Phase control means 34 Slide switch R, R1, R2 Resistance VR Variable resistance L Choke coil C, C1, C2 Capacitor DIAC, DIAC1 , DIAC2 DIAC TRIAC, TRIAC1, TRIAC2 TRIAC Reference number F05694A1

Claims (4)

[Claims] 1. A method for controlling the phase of a sine-wave AC power supply supplied from a power supply means to a motor to adjust the rotation speed of the motor and attenuating harmonic currents generated during the above-described phase control of the AC power supply. A motor operating means for selecting a phase control mode or a strong mode by a user operation, and a power supply when the phase control mode is selected by the operating means. Switching means for supplying AC power supplied from a supply means to the motor through the harmonic current attenuating means, and for directly supplying AC power supplied from the power supply means to the motor when the strong mode is selected. A harmonic current attenuator for a motor, comprising: a motor; 2. The switching means according to claim 1, wherein said switching means supplies an AC power supplied from said power supply means, which is switched in accordance with a mode selected by said operation means, to said motor through said harmonic current attenuating means, or 2. The motor harmonic current attenuating device according to claim 1, wherein the device is a microswitch that directly supplies the motor without passing through the wave current attenuating means. 3. The switching means according to claim 1, wherein said switching means supplies AC power, which is switched in accordance with a mode selected by said operation means and is supplied from said power supply means, to said motor through said harmonic current attenuating means, or 2. The harmonic current attenuating device for a motor according to claim 1, wherein the device is a triac that is supplied directly to the motor without passing through the wave current attenuating means. 4. The switching means includes: a charging / discharging means for supplying and receiving AC power from the power supply means when the strong mode is selected by the operating means; and a voltage supplied through the charging / discharging means. And a triac that supplies AC power supplied from the power supply means directly to the motor without passing through the harmonic current attenuating means when the diac is turned on. The motor according to claim 1, wherein: