KR19990017745A - Harmonic Current Attenuation Device of Motor - Google Patents

Abstract

The present invention relates to a harmonic current attenuation apparatus of a motor, the motor of varying the non-sinusoidal voltage through the phase control of the sinusoidal voltage to control the rotational speed, the E-core and I-core set to a predetermined size, and the E The reactor further comprises a coil configured to be wound around the core, and the three harmonic currents generated during phase control of the sinusoidal voltage are effectively attenuated through the reactor set to a predetermined size, thereby not only complying with IEC regulations, but also operating the power system. Disability can be prevented and product sales can be increased.

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 when driving a cleaner motor.

In general, the motor drive circuit in a conventional conventional cleaner is as shown in FIG.

As can be seen with reference to Figure 1, the AC power having a commercial frequency supplied from the power supply 10 is provided to the motor 30 to drive the motor 30, the internal air by the impeller rotated in conjunction with this The cleaning is performed by sucking the contaminants such as dust from the suction port due to the forced circulation and the amount of air generated by the pressure difference between the outside and the inside of the cleaner.

Here, the waveforms of the voltage V and the current I supplied to the motor 40 are as shown in FIG.

On the other hand, the sinusoidal voltage supplied from the power supply unit 10 is phase-controlled by a triac AC switch (TRIAC) 40 that is switched and controlled according to the gate signal, and is then changed to a non-sinusoidal voltage and then supplied to the motor 30. Because of this, harmonic currents are generated.

In recent years, as the spread of these products increases, the total amount of harmonic currents drawn into the power system is increased, which causes not only operation failures in power capacitors, breakers, etc., but also destruction of transformers.

As part of preventing the harmonics caused by the harmonic currents described above, IEC (International Electrotechnical Commission) has established standards for limiting harmonic currents in association with test laboratories. As shown, of the various harmonic currents generated in the cleaner when adjusted at 90 ° phase, the harmonic current at issue is the 3rd Hamornic Current.

Therefore, various techniques have been studied in various technical fields related to cleaners for attenuating three harmonic currents.

On the other hand, an object of the present invention is to provide a harmonic current attenuation apparatus for a motor capable of attenuating harmonic currents by setting the sizes of the E-core and I-core that constitute the reactor as described above to a predetermined value. There is this.

In order to achieve the above object, a harmonic current attenuation apparatus of a motor according to the present invention includes an E-shape and an I-shape set in a predetermined size in a motor that varies a non-sinusoidal voltage through a phase control of a sinusoidal voltage to control a rotation speed. And a reactor comprising a core and a coil wound around the E-shaped core.

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 motor driving circuit of a harmonic current attenuator of a motor according to a preferred embodiment of the present invention;

5 is a view showing the structure of a reactor according to the present invention,

6 and 7 are views for explaining the harmonic current generated when the motor is driven with a reactor.

Explanation of symbols for main parts of the drawings

10: power supply 20: reactor

22: E-core 24: Coil

26: I-core 30: motor

40: triac

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

4 is a harmonic current attenuation apparatus of a motor according to a preferred embodiment of the present invention, which is composed of a power supply unit 10, a reactor 20, a motor 30, and a triac 40, and includes a conventional motor driving circuit. As can be seen by comparison, the harmonic current attenuation apparatus of the motor according to the present invention is configured to further include a reactor 20.

In FIG. 4, the reactor 20 attenuates three harmonic currents by phase-delaying the sine wave voltage supplied from the power supply unit 10. As shown in the structural diagram shown in FIG. 22) and a coil 24 wound around the E-core 22 and an I-core 26.

Here, the size of the E-shaped core 22 and the I-shaped core 26 constituting the reactor 20 is set to L1 × L2 (preferably 57 × 48mm), thereby effectively attenuating the 3 harmonic currents. You can.

The harmonic current attenuator provided with the reactor 20 configured as described above and the effects thereof will be described in detail with reference to FIGS. 4 to 7.

First, the AC power from the power supply unit 10 is supplied to the motor 30 through the reactor 20 to drive the motor 30, and the internal air is driven by an impeller rotated in conjunction with the rotation of the motor 30. The cleaning is performed by sucking the contaminants such as dust from the suction port due to the forced circulation and the amount of air generated by the pressure difference between the outside and the inside of the cleaner.

At this time, the sine wave voltage is phase-controlled by the triac 40 which is switched and controlled in accordance with the gate signal, so that the sine wave voltage is changed to a non-sinusoidal wave voltage and supplied to the motor 30. Three harmonic currents are attenuated through the reactor 20 composed of the coil 24 wound on the 22 and the I-core 26.

In detail, the sizes of the E-shaped core 22 and the I-shaped core 26 of the reactor 20 are set to a predetermined value (L1 × L2, preferably 57 × 48 mm) so that the three harmonic currents are attenuated.

Experimental data for this is as shown in Table 1 below.

Experimental data of three harmonic currents according to reactor size Harmonic No. Reactor size (L1 × L2) IEC regulations Experiment data Remarks 3harmonic current 54 × 45 2.300A 2.320A FAIL 57 × 48 2.300A 2.260A PASS

Here, the size of the reactor 20 composed of the E-core 22 and the I-core 26 may vary, but as shown in Table 1, the size of the reactor 20 is L1 × L2 (57). X48), it effectively attenuates the 3 harmonic currents to meet IEC regulations.

FIG. 6 shows the voltage V and the current I in the motor driving circuit equipped with the reactor 20 as described above, and FIG. 7 shows the three harmonic currents attenuated accordingly as experimental data. 6 and 7, the three harmonic currents generated during phase control of the sine wave voltage are attenuated through the reactor 20 set to a predetermined size.

As described above, by using the present invention, since the three harmonic currents generated during the phase control of the sinusoidal voltage are effectively attenuated through a reactor set to a predetermined size, the present invention not only meets the IEC regulations but also does not impair the operation of the power system. It can be prevented, and has an excellent effect of promoting product sales.

Claims (2)

A motor for controlling a rotation speed by varying a non-sinusoidal voltage through phase control of a sinusoidal voltage, the motor comprising: a reactor comprising an E-core and an I-core set to a predetermined size, and a coil wound around the E-core; Harmonic current attenuation apparatus of the motor, characterized in that the configuration. 2. The harmonic current attenuation apparatus of claim 1, wherein the size of the E-core and the I-core is set to about 57 x 48 mm.