KR19990036576A - Harmonic Current Attenuation Device of Motor - Google Patents

Abstract

The present invention relates to a harmonic current attenuation apparatus of a motor, and controls the rotational speed of the motor by controlling the phase of the sine wave AC power supplied from the power supply means to the motor, and the harmonics generated during the phase control of the AC power as described above. A harmonic current attenuation apparatus of a motor provided with a harmonic current attenuation means for attenuating current, comprising: operation means for selecting a phase control mode or a strong mode by a user's operation, and when the phase control mode is selected by the operation means; It further comprises a switching means for supplying the AC power supplied from the power supply means to the motor through the harmonic current attenuation means, and directly supplying the AC power supplied from the power supply means to the motor if the strong mode is selected. Harmonics through harmonic transformers during phase control of AC power supplied to motors In addition to attenuating the power supply, when the motor is operated in the strong mode without phase control of the AC power supplied to the motor, AC power from the power supply means is directly supplied to the motor through the switching means instead of through the harmonic transformer, thereby improving the output of the motor. It was made to be possible.

Description

Harmonic Current Attenuation Device of Motor

The present invention relates to a harmonic current attenuation apparatus of a motor, and more particularly, to a harmonic current attenuation apparatus of a motor capable of attenuating harmonic currents generated at the time of driving a cleaner motor and increasing the output of the motor to the maximum.

In general, the motor driving circuit in a conventional conventional vacuum cleaner, as shown in Figure 1, the power supply means for supplying AC power having a commercial frequency and the AC power supplied from the power supply means 10 Filtering means 12 for filtering the noise of the motor, the motor 30 driven by the AC power supplied from the power supply means 10, and is supplied to the motor 30 from the power supply means 10 Phase control means 32 for controlling phase of AC power, slide switch 34 for adjusting whether the motor 30 is driven and rotational speed by user's operation, and control of the phase control means 32. It is composed of a triac (TRId: AC Switch) for controlling the phase of the AC power supplied to the motor 30 by the switching operation.

The phase control means 32 includes a capacitor C, a resistor R, and a diode AC switch (DIAC), and the diaac (DIAC) includes the capacitor (C) and a resistor (R). Is turned on when the voltage supplied over the predetermined voltage (preferably around 40V) is supplied to the gate terminal of the triac (TRIAC), the triac by the operation of the DIAC By the switching operation (TRIAC), the AC power supplied from the power supply means 10 to the motor 30 is phase controlled.

In addition, the slide switch 34 is composed of a switch (SW), the choke coil (L) and a variable resistor (VR), the contact (a, b) of the switch (SW) by the user's operation is connected to each other or open The AC power supplied from the power supply means 10 to the motor 30 is switched, as well as the resistance value of the variable resistor VR is changed by the user's operation to control the speed of the motor 30. At this time, the choke coil L is for filtering the high frequency generated when the resistance value of the variable resistor VR changes.

A motor operation process of a conventional conventional cleaner configured as described above will be described with reference to FIG. 1.

First, when the user operates the slide switch 34 and the contacts a and b of the switch SW are connected to each other, the AC power is supplied to the phase control means 32 through the choke coil L and the variable resistor VR. In this case, the noise included in the AC power is filtered through the filtering means 12.

As the AC power filtered through the filtering means 12 is supplied to the phase control means 32 through the choke coil L and the variable resistor VR as described above, the diaak (in the phase control means 32) The DIAC) is turned on and off, and the triac TRAC is switched by the operation of the DIAC. Thus, the AC power supplied to the motor 30 is phase-controlled.

As described above, the motor 30 is driven by an AC power supplied from the power supply means 10 to the motor 30 through the triac TRIAC, and rotates in conjunction with the driving of the motor 30. As a result, forced air is circulated to generate a pressure difference between the outside of the cleaner and the inside of the cleaner, and cleaning is performed by inhaling contaminants such as dust into the cleaner from the suction port by the generated pressure difference.

Here, the waveforms of the voltage V and the current I supplied to the motor 30 are as shown in FIG.

On the other hand, the triac (TRIAC) is switched by the on-off operation of the diac (DIAC) in the phase control means 32, and is supplied from the power supply means 10 as the triac (TRIAC) is switched in this way Since the sinusoidal voltage of the commercial frequency is phase-controlled, is converted into a non-sinusoidal voltage, and then supplied to the motor 30, harmonic current is generated.

Recently, as the spread of products such as cleaners that control the phase of AC power supplied to motors increases, harmonic currents introduced into the power system are increasing. Such harmonic currents may cause operational disturbances such as power capacitors and breakers. In addition to generating a will cause a breakdown of the transformer.

Therefore, in order to prevent the disturbances caused by harmonic currents, the International Electrotechnical Commission (IEC) has established standards for limiting harmonic currents.

However, when the phase of the AC power supplied to the motor, such as a vacuum cleaner, is adjusted around 90 ° ± 10 °, various harmonic currents are generated. Among them, the harmonic currents in question are three harmonic currents, as shown in FIG. (3rd Hamornic Current).

Therefore, there is an urgent need to attenuate the three harmonic currents to meet the standards established by the International Electrotechnical Commission, and various researches have been conducted on the attenuation technology of the three harmonic currents in various technical fields related to vacuum cleaners.

As a technique for attenuating the above-mentioned three harmonic currents, there is a "harmonic current attenuation device for a motor" filed with the Korean Intellectual Property Office by the same applicant on August 25, 1997, as shown in FIG. AC power having a commercial frequency supplied from the power supply means 10 is switched by a triac (TRIAC), phase controlled to a non-sinusoidal voltage, and then supplied to the motor 30, wherein at around 90 ° ± 10 ° The harmonic current generated by controlling the phase of the AC power supplied to the motor 30 is attenuated by the reactor 20 (hereinafter referred to as "harmonic transformer") acting as a kind of resistance component, thereby effectively reducing the three harmonic currents. Can be.

However, the harmonic current attenuation apparatus of the conventional motor as shown in FIG. 4 supplies AC power to the motor through the harmonic transformer to attenuate harmonic currents generated during phase control of the AC power supplied to the motor. Even when the motor is to be driven in a full power mode that does not control the phase of the AC power supplied to the motor, the voltage of the AC power supplied to the motor drops due to the harmonic transformer acting as a resistance component. It is limited to this predetermined value (for example, about 1400W), and there is a problem in that suction power is weak.

Accordingly, the present invention has been made to solve the above-described problems, the phase control of the AC power supplied to the motor, as well as attenuating the harmonic current through the harmonic transformer during phase control of the AC power supplied to the motor. It is an object of the present invention to provide a harmonic current attenuation device of a motor which can improve the output of the motor by directly supplying AC power from the power supply means to the motor without going through the harmonic transformer when the motor is operated in the strong mode without the power supply.

In order to achieve the above object, the harmonic current attenuation apparatus of the motor according to the present invention controls the phase of the sine wave AC power supplied from the power supply means to the motor, thereby adjusting the rotational speed of the motor, and controlling the phase of the AC power as described above. A harmonic current attenuation apparatus of a motor provided with a harmonic current attenuation means for attenuating harmonic currents generated at a time, the apparatus comprising: operation means for selecting a phase control mode or a strong mode by a user's operation, and a phase by the operation means Switching means for supplying AC power supplied from the power supply means to the motor through the harmonic current attenuation means when the control mode is selected, and directly supplying AC power supplied from the power supply means to the motor when the strong mode is selected. Characterized in that further comprises.

1 is a view showing a motor driving circuit in a conventional conventional cleaner;

2 and 3 are views for explaining the harmonic current generated during a conventional motor drive,

4 is a diagram illustrating a conventional motor driving circuit equipped with a harmonic transformer for attenuating harmonic currents generated at the time of driving a motor;

5 is a circuit diagram of a harmonic current attenuation apparatus of a motor according to an embodiment of the present invention;

6 is a circuit diagram of a harmonic current attenuator of a motor according to another embodiment of the present invention;

7 is a circuit diagram of a harmonic current attenuation apparatus of a motor according to another embodiment of the present invention;

8 is a view for explaining the output of the motor according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10: power supply means 12: filtering means

20: harmonic transformer 21: switching means

22: micro switch 24: charging and discharging means

30: motor 32: phase control means

34: slide switch R, R1, R2: resistance

VR: Variable resistor L: Choke coil

C, C1, C2: Capacitor DIAC, DIAC1, DIAC2: Diaak

TRIAC, TRIAC1, TRIAC2: Triac

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention. On the other hand, the same reference numerals are attached to the same parts as in the conventional configuration, and operation description thereof will be omitted in order to avoid duplicate descriptions.

5 is a circuit diagram of a harmonic current attenuator of a motor according to an embodiment of the present invention, Figure 6 is a circuit diagram of a harmonic current attenuator of a motor according to another embodiment of the present invention, Figure 7 is yet another embodiment of the present invention As a circuit diagram of a harmonic current attenuator of a motor according to an embodiment, the harmonic current attenuator of a motor according to the present invention shown in FIGS. 5 to 7 and the conventional harmonic current attenuator of a conventional motor shown in FIG. As can be seen, the harmonic current attenuator of the motor according to the present invention is different from the harmonic current attenuator of the conventional motor, the contact switch (b) corresponding to the strong mode is formed in the slide switch 34, the user's operation As the contacts a and b in the slide switch 34 are connected or opened with each other, the AC power supplied from the power supply means 10 is directly supplied to the motor 30 or the harmonic transformer 20 is supplied. Switching means 21 for supplying the motor through the 30 is further provided.

Herein, as shown in the embodiment of FIG. 5, the switching means 21 is connected to each other as the contacts h and i are connected to each other as the contacts a and b in the slide switch 34 are opened or opened. The micro switch 22 is opened, AC power supplied through the triac (TRIAC) from the power supply means 10 according to the on-off operation of the micro switch 22 is supplied directly to the motor 30 or It is supplied to the motor 30 via the harmonic transformer 20.

In addition, as shown in another embodiment of FIG. 6, the switching means 21 is a second triac TRIAC2 that switches as the contacts a and b in the slide switch 34 are connected or opened with each other. The AC power supplied from the power supply means 10 through the first triac TRIAC1 is directly supplied to the motor 30 or the harmonic transformer 20 according to the switching operation of the second triac TRIAC2. It is supplied to the motor 30 via.

In addition, the switching means 21 is charged and discharged by receiving AC power from the power supply means 10 through the contacts (a, b) in the slide switch 34, as shown in another embodiment of FIG. Charge and discharge means (24) consisting of a capacitor (C2) and a resistor (R2), a second diamond (DIAC2) on and off operation in accordance with the voltage supplied through the charge and discharge means 24, and the second die When the evil DIAC2 is turned on, the second triac TRAC2 directly supplies the AC power supplied from the power supply means 10 to the motor 30, and includes the contacts a, b) the AC power supplied from the power supply means 10 directly to the motor 30, or AC power supplied from the power supply means 10 through the first triac (TRIAC1) as connected to each other or opened. The motor 30 is supplied to the motor 30 via the harmonic transformer 20.

An operation effect of the harmonic current damping device of the motor according to the embodiment of the present invention configured as described above will be described in detail with reference to FIGS. 5 and 8.

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, when the user operates the slide switch 34 and the contact a of the switch SW is connected to the contacts c and f, respectively, AC power supplied from the supply means 10 is filtered through the filtering means 12 and then supplied to the phase control means 32, and the AC power filtered through the filtering means 12 as described above is supplied to the phase control means ( 32, the diaac (DIAC) in the phase control means 32 is turned on and off, and the triac (TRIAC) is switched by the operation of the diaac (DIAC), the power supply means The AC power supplied from (10) is phase controlled.

Then, while the AC power controlled in phase through the triac passes through the harmonic transformer 20, the harmonic current generated during phase control is attenuated and then supplied to the motor 30 to drive the motor 30. do.

Therefore, the internal air is forcedly circulated by the impeller rotated in conjunction with the driving of the motor 30 to generate a pressure difference between the outside and the inside of the cleaner, and by this pressure difference, contaminants such as dust are sucked into the cleaner by the suction port. Cleaning is performed.

At this time, in a state in which the switch SW contact a in the slide switch 34 is connected to the contacts c and f, respectively, the resistance value of the variable resistor VR is changed by the user's operation. The rotation speed of) is adjusted.

Meanwhile, in order to drive the motor 30 in the full power mode without controlling the phase of the AC power supplied to the motor 30, the user operates the slide switch 34 to switch the switch in the slide switch 34 ( When the contact a is connected to the contacts b and e (time t in Fig. 8), the contacts h and i of the micro switch 22 are connected to each other.

Therefore, when the AC power supplied through the triac TRIAC is directly supplied to the motor 30 through the micro switch 22 without passing through the harmonic transformer 20, the motor 30 is driven in the strong mode. Since the voltage of the AC power supply does not drop by the harmonic transformer 20 acting as a resistance component, as shown in FIG. 8, the output of the motor 30 is increased to 1600W or more.

Hereinafter, the effect of the harmonic current attenuator of the motor according to another embodiment of the present invention will be described in detail with reference to FIGS. 6 and 8.

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, when the user operates the slide switch 34 and the contact a of the switch SW is connected to the contacts c and f, respectively, AC power supplied from the supply means 10 is filtered through the filtering means 12 and then supplied to the phase control means 32, and the AC power filtered through the filtering means 12 as described above is supplied to the phase control means ( 32, the diac (DIAC) in the phase control means 32 is turned on and off, and the first triac (TRIAC1) is switched by the operation of the diac (DIAC), so that the power source The AC power supplied from the supply means 10 is phase controlled.

In addition, while the AC power controlled by the phase through the first triac TRIAC1 passes through the harmonic transformer 20, the harmonic current generated during phase control is attenuated, and then supplied to the motor 30 to supply the motor 30. Is driven.

Therefore, the internal air is forcedly circulated by the impeller rotated in conjunction with the driving of the motor 30 to generate a pressure difference between the outside and the inside of the cleaner, and by this pressure difference, contaminants such as dust are sucked into the cleaner by the suction port. Cleaning is performed.

At this time, in a state in which the switch SW contact a in the slide switch 34 is connected to the contacts c and f, respectively, the resistance value of the variable resistor VR is changed by the user's operation. The rotation speed of) is adjusted.

Meanwhile, in order to drive the motor 30 in the full power mode without controlling the phase of the AC power supplied to the motor 30, the user operates the slide switch 34 to switch the switch in the slide switch 34 ( SW) When the contact a is connected to the contacts b and e, respectively (time t in FIG. 8), the second triac TRIAC2 is turned on.

Therefore, the AC power supplied through the first triac TRIAC1 is directly supplied to the motor 30 through the second triac TRIAC2 without passing through the harmonic transformer 20, so that the motor 30 is driven in a strong mode. When driven, since the voltage of the AC power supply is not lowered by the harmonic transformer 20 acting as a resistance component, as shown in FIG. 8, the output of the motor 30 is increased to 1600W or more.

Hereinafter, the effect of the harmonic current damping device of the motor according to another embodiment of the present invention will be described in detail with reference to FIGS. 7 and 8.

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 and c of the switch SW are connected to each other, the power supply means 10 As the supplied AC power is filtered through the filtering means 12 and then supplied to the phase control means 32, and the AC power filtered through the filtering means 12 is supplied to the phase control means 32 as described above. The first diak DIAC1 in the phase control means 32 is turned on and off, and the first triac TRAC1 is switched by the operation of the first diac DIAC1. The AC power supplied from (10) is phase controlled.

In addition, while the AC power controlled by the phase through the first triac TRIAC1 passes through the harmonic transformer 20, the harmonic current generated during phase control is attenuated, and then supplied to the motor 30 to supply the motor 30. Is driven.

Therefore, the internal air is forcedly circulated by the impeller rotated in conjunction with the driving of the motor 30 to generate a pressure difference between the outside and the inside of the cleaner, and by this pressure difference, contaminants such as dust are sucked into the cleaner by the suction port. Cleaning is performed.

At this time, in a state in which the switch SW contacts a and c in the slide switch 34 are connected to each other, the speed of the motor 30 is adjusted as the resistance value of the variable resistor VR is changed by a user's operation. do.

Meanwhile, in order to drive the motor 30 in the full power mode without controlling the phase of the AC power supplied to the motor 30, the user operates the slide switch 34 to switch the switch in the slide switch 34 ( SW) When the contacts a and b are connected to each other (time t in FIG. 8), the AC power source is connected via the charge / discharge means 24 and the second diaak DIAC2 which are made up of the capacitor C2 and the resistor R2. The second triac TRIAC2 is supplied to the gate terminal of the second triac TRIAC2 to be 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 when the motor 30 is driven in the strong mode, the harmonic transformer acts as a resistance component. Since the AC power supply does not drop voltage by 20, the output of the motor 30 is raised to 1600W or more as shown in FIG.

At this time, the second triac (TRIAC2) is malfunctioned by the external power supply noise by using the charge and discharge means 24 and the second diaak (DIAC2) consisting of the capacitor (C2) and the resistor (R2) as described above. You can prevent it.

In particular, in a handle control type vacuum cleaner in which the slide switch 34 is attached to the vacuum cleaner hose, the external power supply noise is very high and malfunction of the second triac TRIAC2 is likely to occur. By using the charging / discharging means 24 and the second diac DIAC2 composed of C2) and the resistor R2, it is possible to prevent the second triac TriAC2 from malfunctioning due to external power supply noise.

As described above, when the present invention is used, the harmonic current is attenuated through the harmonic transformer during phase control of the AC power supplied to the motor, and the power source is operated in the strong mode without phase control of the AC power supplied to the motor. By directly supplying AC power from the supply means to the motor through the switching means without passing through the harmonic transformer, the output of the motor can be improved.

Claims (4)

The motor is provided with a harmonic current attenuation means for controlling the rotational speed of the motor by controlling the phase of the sine wave AC power supplied from the power supply means to the motor, and attenuating the harmonic current generated during the phase control of the AC power as described above. In the harmonic current attenuation apparatus of Operation means for selecting a phase control mode or a powerful mode by a user's operation; When the phase control mode is selected by the operation means, AC power supplied from the power supply means is supplied to the motor through the harmonic current attenuation means, and when the strong mode is selected, AC power supplied from the power supply means is supplied to the motor. Harmonic current attenuation apparatus of the motor, characterized in that it further comprises a switching means for supplying directly. The method of claim 1, The switching means is switched according to the mode selected by the operation means to supply AC power supplied from the power supply means to the motor through the harmonic current damping means or directly to the motor without passing through the harmonic current damping means. Harmonic current damping device of the motor, characterized in that the micro switch. The method of claim 1, The switching means is switched according to the mode selected by the operation means to supply AC power supplied from the power supply means to the motor through the harmonic current damping means or directly to the motor without passing through the harmonic current damping means. Harmonic current attenuation apparatus of the motor, characterized in that the triac. The method of claim 1, The switching means may include charging and discharging means for charging and discharging AC power from the power supply means when the strong mode is selected by the operation means; A diaak turned on and off by a voltage supplied through the charging and discharging means; And a triac for directly supplying AC power supplied from the power supply means to the motor when the diaak is turned on, without passing through the harmonic current attenuation means.