KR101822897B1 - Motor driving apparatus and home appliance including the same - Google Patents

Abstract

The present invention relates to a motor driving apparatus and a home appliance having the motor driving apparatus. The motor driving apparatus according to an embodiment of the present invention includes a dc-stage capacitor for storing a dc power supply, a three-phase sagittal switching device and a bottom-arm switching device, and the dc- And a control unit for controlling the inverter. The control unit controls the switching elements in the inverter by the variable control of the pulse width based on the space vector, and controls the switching elements within the voltage vector So as to operate in the first mode in which the zero vector is removed. Thus, the current flowing into the capacitor disposed at the dc stage can be reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a motor driving apparatus and a home appliance having the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor driving apparatus and a home appliance having the motor driving apparatus, and more particularly, to a motor driving apparatus capable of reducing a current flowing into a capacitor disposed in a dc stage and a home appliance having the motor driving apparatus.

The motor driving apparatus is an apparatus for driving a motor having a rotor for rotating and a stator for winding a coil.

On the other hand, the motor drive apparatus can be classified into a sensor-driven motor drive apparatus using sensors and a sensorless motor drive apparatus without sensor.

2. Description of the Related Art In recent years, sensorless motor drive devices have been widely used due to a reduction in manufacturing cost and the like. Accordingly, a sensorless motor drive device has been studied for efficient motor drive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor driving apparatus capable of reducing a current flowing into a capacitor disposed in a dc stage and a home appliance having the motor driving apparatus.

It is another object of the present invention to provide a motor drive apparatus capable of reducing a zero vector in a voltage vector and a home appliance having the motor drive apparatus.

According to an aspect of the present invention, there is provided a motor driving apparatus including a dc-stage capacitor for storing a dc power source, a three-phase sagittal switching device and a bottom-arm switching device, And a control unit for controlling the inverter. The control unit controls the switching device in the inverter by a space-vector-based variable pulse width control. And controls to operate in the first mode in which the zero vector is removed from the voltage vector.

According to another aspect of the present invention, there is provided a motor driving apparatus including a dc-stage capacitor for storing a dc power source, a three-phase sagittal switching device and a bottom-arm switching device, And a control unit for controlling the inverter. The control unit controls the inverter so that the three-phase sagittal switching elements in the inverter are all turned on and off So that the first mode does not occur.

According to another aspect of the present invention, there is provided a home appliance including a dc-stage capacitor for storing a dc power source, a three-phase sagittal switching device and a bottom-arm switching device, And a control unit for controlling the inverter. The control unit controls the switching device in the inverter by the space-vector-based pulse width variable control, And controls to operate in the first mode in which the zero vector is removed from the voltage vector.

According to another aspect of the present invention, there is provided a home appliance including a dc-stage capacitor for storing a dc power source, a three-phase sagittal switching device and a bottom-arm switching device, An inverter for converting the DC power from the capacitor to an AC power source and outputting the converted AC power to the motor, and a control unit for controlling the inverter, wherein the control unit controls the inverter And controls the first mode to operate in the first mode in which no section is turned off.

According to an embodiment of the present invention, a motor driving apparatus and a home appliance having the motor driving apparatus include a dc-stage capacitor for storing a dc power supply, a three-phase sagittal switching device and a bottom-arm switching device, An inverter for converting a DC power source from the capacitor to an AC power source and outputting the converted AC power to the motor and a control unit for controlling the inverter, The current flowing into the capacitor disposed at the dc stage can be reduced by controlling the device to operate in the first mode in which the zero vector is removed from the voltage vector.

Thus, the heat generated in the capacitor disposed in the dc stage can be reduced, and the element stability of the capacitor is improved.

As a result, the capacitance of the capacitor can be reduced. Therefore, the manufacturing cost and the like can be reduced.

On the other hand, since the number of switching times can be reduced for zero vector reduction, the switching loss in the inverter can be reduced.

On the other hand, when the voltage vector is located in the region where the zero vector can be removed, the zero vector is removed as the first mode, and when the voltage vector is located in the non-removable region, By controlling the zero vector to be reduced, the current flowing into the capacitor arranged at the dc stage can be reduced.

On the other hand, a simple implementation is possible by shifting the switching time for some of the three-phase switching vectors for zero vector elimination or reduction.

1 illustrates an example of an internal block diagram of a motor driving apparatus according to an embodiment of the present invention.
2 is an example of an internal circuit diagram of the motor driving apparatus of FIG.
3 is an internal block diagram of the inverter control unit of FIG.
4 is a diagram referred to explain the current flowing in the dc short capacitor.
Figures 5A-5B are diagrams referenced to illustrate the zero vector.
6A to 6C are diagrams illustrating a zero vector removal technique in a motor driving apparatus according to an embodiment of the present invention.
Figs. 7 to 12B are views referred to in the description of the operation of Figs. 6A to 6C.
13 is a flowchart for explaining a method of operating the motor driving apparatus according to the embodiment of the present invention.
FIG. 14 is a perspective view illustrating a laundry processing apparatus, which is an example of a home appliance according to an embodiment of the present invention.
FIG. 15 is an internal block diagram of the laundry processing apparatus of FIG. 14. FIG.
Fig. 16 is a diagram illustrating a configuration of an air conditioner, which is another example of a home appliance according to an embodiment of the present invention.
17 is a schematic view of the outdoor unit and the indoor unit of Fig. 16;
18 is a perspective view illustrating a refrigerator as another example of a home appliance according to an embodiment of the present invention.
Fig. 19 is a view schematically showing the configuration of the refrigerator of Fig. 18;

Hereinafter, the present invention will be described in detail with reference to the drawings.

The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.

The motor driving apparatus described in this specification can estimate the rotor position of the motor by a sensorless method in which a position sensing unit such as a hall sensor for sensing the rotor position of the motor is not provided Which is a motor-driven device. Hereinafter, a sensorless motor drive apparatus will be described.

Meanwhile, the motor driving apparatus 220 according to the embodiment of the present invention may be referred to as a motor driving unit.

FIG. 1 illustrates an example of an internal block diagram of a motor driving apparatus according to an embodiment of the present invention, and FIG. 2 illustrates an example of an internal circuit diagram of the motor driving apparatus of FIG.

The motor driving apparatus 220 according to the embodiment of the present invention drives the motor in a sensorless manner and may include an inverter 420 and an inverter control unit 430 have.

The motor driving apparatus 220 according to the embodiment of the present invention may include a converter 410, a dc short-circuit voltage detector B, a dc short-circuit capacitor C, and an output current detector E. The driving unit 220 may further include an input current detection unit A, a reactor L, and the like.

Meanwhile, the inverter control unit 430 in the motor driving apparatus 220 according to an embodiment of the present invention controls the switching elements in the inverter by the d space vector-based pulse width variable control, It is possible to control to operate in the removed first mode. As a result, the current flowing into the dc-stage capacitor in the motor driving apparatus 220 can be reduced. Therefore, the heat generated in the capacitor disposed at the dc stage can be reduced, and the element stability of the capacitor is improved. Further, the capacitance of the capacitor can be reduced.

In particular, it becomes possible to use a small-capacity dc single capacitor C, which is called capacitorless.

Hereinafter, the operation of each of the constituent units in the motor driving apparatus 220 of Fig. 1 and Fig. 2 will be described.

The reactor L is disposed between the commercial AC power source 405 (v _s ) and the converter 410, and performs a power factor correcting or boosting operation. The reactor L may also function to limit the harmonic current due to the fast switching of the converter 410.

The input current detection section A can detect the input current (i _s ) input from the commercial AC power source 405. To this end, a current transformer (CT), a shunt resistor, or the like may be used as the input current detector A. The detected input current i _s can be input to the inverter control unit 430 as a discrete signal in the form of a pulse.

The converter 410 converts the commercial AC power source 405, which has passed through the reactor L, into DC power and outputs the DC power. Although the commercial AC power source 405 is shown as a single-phase AC power source in the figure, it may be a three-phase AC power source. The internal structure of the converter 410 also changes depending on the type of the commercial AC power source 405.

Meanwhile, the converter 410 may include a diode without a switching element, and may perform a rectifying operation without a separate switching operation.

For example, in the case of a single-phase AC power source, four diodes may be used in the form of a bridge, and in the case of a three-phase AC power source, six diodes may be used in the form of a bridge.

On the other hand, the converter 410 may be, for example, a half-bridge type converter in which two switching elements and four diodes are connected, and in the case of a three-phase AC power source, six switching elements and six diodes may be used . In this case, the converter 410 may be referred to as a rectifier.

When the converter 410 includes a switching element, the boosting operation, the power factor correction, and the DC power conversion can be performed by the switching operation of the switching element.

The dc single capacitor C smoothes the input power supply and stores it. In the figure, one element is exemplified by the dc-terminal capacitor C, but a plurality of elements are provided, thereby ensuring the element stability.

For example, when the DC power from the solar cell is supplied to the dc capacitor C, the dc capacitor C is connected to the output terminal of the converter 410. However, the present invention is not limited thereto, Or may be DC / DC converted and input. Hereinafter, the portions illustrated in the drawings are mainly described.

On the other hand, both ends of the dc short-circuit capacitor C may be referred to as a dc stage or a dc stage since the dc power source is stored.

the dc short-circuit voltage detector B can detect the dc short-circuit voltage Vdc at both ends of the dc short-circuit capacitor C. For this purpose, the dc voltage detection unit B may include a resistance element, an amplifier, and the like. The detected dc voltage source Vdc can be input to the inverter control unit 430 as a discrete signal in the form of a pulse.

The inverter 420 includes a plurality of inverter switching elements and converts the smoothed DC power supply Vdc into a three-phase AC power supply va, vb, vc having a predetermined frequency by on / off operation of the switching element, And outputs it to the synchronous motor 230.

The inverter 420 includes a pair of upper arm switching elements Sa, Sb and Sc and lower arm switching elements S'a, S'b and S'c serially connected to each other, The switching elements are connected to each other in parallel (Sa & S a, Sb & S'b, Sc & S'c). Diodes are connected in anti-parallel to each switching element Sa, S'a, Sb, S'b, Sc, S'c.

The switching elements in the inverter 420 perform ON / OFF operations of the respective switching elements based on the inverter switching control signal Sic from the inverter controller 430. [ Thus, three-phase AC power having a predetermined frequency is output to the three-phase synchronous motor 230.

The inverter control unit 430 can control the switching operation of the inverter 420 based on the sensorless method. To this end, the inverter control unit 430 may receive the output current idc detected by the output current detection unit E.

The inverter control unit 430 outputs the inverter switching control signal Sic to the inverter 420 to control the switching operation of the inverter 420. [ The inverter switching control signal Sic is generated and outputted based on the output current idc detected by the output current detection section E as a switching control signal of the pulse width modulation method (PWM). Detailed operation of the output of the inverter switching control signal Sic in the inverter control unit 430 will be described later with reference to Fig.

The output current detection unit E can detect the output current idc flowing between the three-phase motors 230. [

The output current detection unit E can be disposed in the inverter 420 and the motor 230 to detect the current flowing in the motor 230 as shown in the figure.

The output current detection section E may include three resistance elements as shown in the drawing. It is possible to detect phase currents (ia, ib, ic) that are the output currents io flowing through the motor 230 through the three resistive elements. The detected output currents (ia, ib, ic) can be applied to the inverter control unit 430 as a discrete signal in the form of pulses, and based on the detected output currents ia, ib, ic, The switching control signal Sic is generated.

In the present specification, the output currents ia, ib, ic, or io are used in combination.

On the other hand, unlike the drawing, the output current detecting section E may include two resistance elements. The phase currents of the remaining phases can be calculated using three-phase equilibrium.

The output current detection unit E is disposed between the dc short-circuit capacitor C and the inverter 420 and includes a single shunt resistor Rs to control the current flowing through the motor 230 . This method can be called a 1-shunt method.

According to the one-shunt method, the output current detection section E uses the single shunt resistor element Rs to detect the output current (current) flowing through the motor 230 in time division at the time of turning on the lower arm switching element of the inverter 420 idc) can be detected.

The detected output current idc can be applied to the inverter control unit 430 as a pulse discrete signal and the inverter switching control signal Sic is generated based on the detected output current idc .

On the other hand, the three-phase motor 230 has a stator and a rotor, and each phase alternating current power of a predetermined frequency is applied to a coil of a stator of each phase (a, b, c) .

The motor 230 may be a surface-mounted permanent magnet synchronous motor (SMPMSM), a permanent magnet synchronous motor (IPMSM), and a synchronous relay A synchronous motor (Synchronous Reluctance Motor; Synrm), and the like. Among them, SMPMSM and IPMSM are permanent magnet applied Permanent Magnet Synchronous Motor (PMSM), and Synrm is characterized by having no permanent magnet.

3 is an internal block diagram of the inverter control unit of FIG.

3, the inverter control unit 430 includes an axis conversion unit 310, a speed calculation unit 320, a current command generation unit 330, a voltage command generation unit 340, an axis conversion unit 350, And a switching control signal output unit 360.

The axis converting unit 310 can convert the output currents ia, ib, ic detected by the output current detecting unit E into the two-phase currents iα, iβ in the stationary coordinate system.

On the other hand, the axis converting unit 310 can convert the two-phase current i ?, i? Of the still coordinate system into the two-phase current id, iq of the rotating coordinate system.

Based on the output currents (ia, ib, ic) detected by the output current detecting unit E, the speed calculating unit 320 calculates the position value

), Differentiates the estimated position,

) Can be calculated.

On the other hand, the current command generation unit 330 generates the current command

(I ^* _q ) on the basis of the speed command value? ^* _R and the speed command value? ^* _R. For example, the current command generation section 330 generates the current command

The PI controller 335 performs the PI control based on the difference between the speed command value? ^* _R and the speed command value? ^* _R , and generates the current command value i ^* _q . In the figure, the q-axis current command value (i ^* _q ) is exemplified by the current command value, but it is also possible to generate the d-axis current command value (i ^* _d ) unlike the figure. On the other hand, the value of the d-axis current command value i ^* _d may be set to zero.

On the other hand, the current command generation section 330 may further include a limiter (not shown) for limiting the current command value (i ^* _q ) so that the current command value (i ^* _q ) does not exceed the allowable range.

Next, the voltage command generating unit 340 generates the voltage command generating unit 340 with the d-axis and q-axis currents (i _d , i _q ) axially transformed into the two-phase rotational coordinate system in the axial converting unit and the current command value based on ^{_{i * d, i * q)}} , and generates a d-axis, q-axis voltage command value ^{_{(v * d, v * q}} ). For example, the voltage command generation unit 340 performs PI control in the PI controller 344 based on the difference between the q-axis current (i _q ) and the q-axis current command value (i ^* _q ) It is possible to generate the axial voltage command value v ^* _q . The voltage command generation unit 340 performs PI control in the PI controller 348 based on the difference between the d-axis current i _d and the d-axis current command value i ^* _d , It is possible to generate the command value v ^* _d . The voltage command generator 340 may further include a limiter (not shown) for limiting the level of the d-axis and q-axis voltage command values v ^* _d and v ^* _q so as not to exceed the permissible range .

On the other hand, the generated d-axis and q-axis voltage command values (v ^* _d and v ^* _q ) are input to the axial conversion unit 350.

The axis transforming unit 350 transforms the position calculated by the velocity calculating unit 320

) And the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ).

First, the axis converting unit 350 performs conversion from a two-phase rotating coordinate system to a two-phase stationary coordinate system. At this time, the position calculated by the speed calculator 320 (

) Can be used.

Then, the axial conversion unit 350 performs conversion from the two-phase stationary coordinate system to the three-phase stationary coordinate system. Through this conversion, the axial conversion unit 1050 outputs the three-phase output voltage instruction values v ^* a, v ^* b, v ^* c.

The switching control signal output section 360 generates the switching control signal Sic for inverter according to the pulse width modulation (PWM) method based on the three-phase output voltage instruction values v ^* a, v ^* b and v ^* And outputs it.

The output inverter switching control signal Sic may be converted into a gate driving signal in a gate driving unit (not shown) and input to the gate of each switching element in the inverter 420. As a result, the switching elements Sa, S'a, Sb, S'b, Sc, and S'c in the inverter 420 perform the switching operation.

On the other hand, the switching control signal output unit 360 can output the switching control signal in which the zero vector is removed in the voltage vector in the first mode, and in the second mode, the switching control signal Can be output.

In particular, when the voltage vector is located in a region where the zero vector can be removed, the switching control signal output unit 360 can output the switching control signal from which the zero vector is removed within the voltage vector, It is possible to output a switching control signal in which the zero vector is reduced in the voltage vector.

The switching control signal output unit 360 may control the switching vector of the three phases to be on during the switching period during the first mode period or may switch the smallest switching vector among the three- It is possible to output a switching control signal.

On the other hand, when the turn-on time corresponding to the second-order switching vector of the three-phase switching vector is smaller than half of the switching period during the first mode period, the switching control signal output unit 360 outputs, It is possible to output a switching control signal that causes the largest switching vector to be turned on throughout the switching period.

On the other hand, when the turn-on time corresponding to the second-order switching vector of the three-phase switching vector is greater than half of the switching period during the first mode period, the switching control signal output unit 360 outputs, It is possible to output a switching control signal that causes the smallest switching vector to be turned off within the switching period.

On the other hand, when the largest switching vector among the three-phase switching vectors is turned on during the switching period during the first mode period, the switching control signal output unit 360 outputs a switching signal corresponding to the switching vector of the second- The on-time is shifted.

On the other hand, when the smallest switching vector among the switching vectors of the three phases is turned off during the switching period during the first mode period, the switching control signal output unit 360 outputs the switching signal corresponding to the second- The on-time is shifted.

On the other hand, when the voltage vector is located in one of the sector 1, the sector 3 and the sector 5 of the space vector area, the switching control signal output unit 360 outputs the switching vector corresponding to the second- It is possible to output a switching control signal in which the turn-on time is shifted to the right.

On the other hand, when the voltage vector is located in one of the sector 2, the sector 4, and the sector 6 of the space vector area during the first mode period, the switching control signal output unit 360 outputs the second The turn-on time corresponding to the switching vector of the switching control signal is shifted to the left.

On the other hand, during the second mode period, the switching control signal output unit 360 turns on the largest switching vector among the three-phase switching vectors during the switching period, and turns on the corresponding one of the three- It is possible to output a switching control signal whose time is shifted.

On the other hand, during the second mode period, the switching control signal output unit 360 turns off the smallest switching vector among the three-phase switching vectors during the switching period, and turns on the corresponding one of the three- It is possible to output a switching control signal whose time is shifted.

4 is a diagram referred to explain the current flowing in the dc short capacitor.

Referring to the drawings, a motor driving apparatus 100 includes a converter 410 for converting a commercial AC power source 405 to a DC power source, an inverter 420 for converting a DC power source to an AC power source to drive the motor, And a dc-terminal capacitor C disposed at both ends of the dc terminal, which is an output terminal of the dc-terminal capacitor 410.

In the drawing, the current flowing through the output terminal of the converter 410 is denoted by Iconv, the current flowing to the inverter 420 is denoted by Iivn, and the current flowing through the dc-stage capacitor C is denoted by Icap .

On the other hand, when the current Iconv flowing through the output terminal of the converter 410 and the current Iivn flowing through the inverter 420 coincide with each other, the current Icap flowing in the dc short-circuit capacitor C ideally becomes '0' .

Accordingly, when the inverter current Iivn having the same magnitude as the current Iconv flowing through the output terminal of the converter 410 flows, the current Icap flowing in the dc short-circuit capacitor C can be reduced.

Meanwhile, the switching control signal applied to the inverter 420 may be a space vector-based pulse width variable control signal.

That is, the switching control signal may be generated based on the voltage vector corresponding to the voltage command value generated by the voltage command generator 540 of FIG.

On the other hand, the voltage vector may be composed of a three-phase switching vector so as to drive the three-phase inverter upper-arm switching element and the lower arm switching element.

On the other hand, the voltage vector can be divided into an effective vector and a zero vector.

During the switching period of the inverter 420, the effective vector period to which the effective vector is applied and the zero vector period to which the zero vector is applied may be displayed.

The zero vector section may include a period in which all of the three-phase sagittal switching elements in the inverter are turned on or a period in which all three-phase sagittal switching elements in the inverter are turned off.

On the other hand, during the valid vector period, the actual current is applied to the inverter 420, and the actual current does not flow to the inverter 420 during the zero vector period. Therefore, the capacitor current increases during the zero vector period.

Therefore, the present invention proposes a technique of eliminating or reducing a zero vector, with reference to FIGS. 6A to 6C and the like.

Specifically, the inverter control unit 430 may shift the switching vector of one of the voltage vectors, that is, three-phase switching vectors, to remove the zero vector in the voltage vector.

The inverter control unit 430 can control the voltage vector to operate in the first mode in which the zero vector is removed from the voltage vector when the voltage vector is located in the area where the zero vector can be removed.

That is, during the first mode period, the inverter control unit 430 controls the three-phase upper-arm switching elements Sa, Sb, and Sc in the inverter, Can be controlled so as not to occur.

On the other hand, when the voltage vector is located in an area where the zero vector can not be removed, the inverter control unit 430 can control to operate in the second mode in which the zero vector is reduced in the voltage vector.

Figures 5A-5B are diagrams referenced to illustrate the zero vector.

FIG. 5A illustrates an example of a three-phase switching vector PWM-A, PWM-B, and PWM-C.

The sections 502a and 502b in which all three-phase upper arm switching elements Sa, Sb and Sc in the inverter are turned off and the sections 501a and 502b in which all three-phase upper arm switching elements Sa, Sb and Sc in the inverter are turned on ) Are exemplified.

These intervals 502a, 502b, and 501 correspond to a zero vector period in which no current flows in the actual inverter 420. [ The other sections correspond to the effective vector sections through which actual current flows.

Fig. 5B illustrates another example of the three-phase switching vector PWM-A, PWM-B, and PWM-C.

Referring to the drawing, unlike FIG. 5A, the turn-on time of the switching vector PWM-A is turned on during the switching period.

As a result, the section where all three-phase upper arm switching elements Sa, Sb and Sc in the inverter disappears but the section 501 in which all three-phase upper arm switching elements Sa, Sb and Sc in the inverter are turned on remains intact .

Referring to FIGS. 5A and 5B, since there is a zero vector interval, a current component flowing in the dc short capacitor C increases.

FIGS. 6A to 6C are diagrams for explaining a zero vector removal technique in a motor driving apparatus according to an embodiment of the present invention, and FIGS. 7 to 12B are diagrams referencing operation descriptions of FIGS. 6A to 6C.

First, FIG. 6A illustrates an example of three-phase switching vectors Ta, Tb and Tc.

In the drawing, there is a zero vector interval To and an effective vector interval T2 / 2 and T / 2 in Ts. On the other hand, 2Ts can be called a switching period, and Ts can be called half of a switching period.

On the other hand, in the figure, sections 602a and 602b in which all three-phase upper arm switching elements Sa, Sb and Sc in the inverter are turned off and sections in which three-phase upper arm switching elements Sa, Sb and Sc in the inverter are turned on 601) are exemplified.

These intervals 602a, 602b and 601 correspond to a zero vector period in which no current flows in the actual inverter 420. [ The other sections correspond to the effective vector sections through which actual current flows.

6B illustrates an example of three-phase switching vectors (Ta, Tb, Tc) in which zero vectors are removed according to an embodiment of the present invention.

6A, the turn-on time of the a-phase switching vector Ta is extended and turned on during the switching period 2Ts, and the turn-on time 604a of the b-phase switching vector Tb is , And shifted to the right.

Thereby, in the switching period, a section in which all the three-phase upper arm switching elements Sa, Sb and Sc in the inverter are turned off and a section in which all three-phase upper arm switching elements Sa, Sb and Sc in the inverter are turned on . Therefore, it becomes possible to reduce the current component flowing in the dc short-circuit capacitor C.

6C illustrates an example of three-phase switching vectors (Ta, Tb, Tc) in which zero vectors are removed according to an embodiment of the present invention.

6A, the turn-on time of the a-phase switching vector Ta is extended and turned on during the switching period 2Ts, and the turn-on time 604b of the b-phase switching vector Tb is , And is shifted to the left.

Thereby, in the switching period, a section in which all the three-phase upper arm switching elements Sa, Sb and Sc in the inverter are turned off and a section in which all three-phase upper arm switching elements Sa, Sb and Sc in the inverter are turned on . Therefore, it becomes possible to reduce the current component flowing in the dc short-circuit capacitor C.

Figure 7 illustrates a space vector area 700.

The first area 701 in the space vector area 700 is an area in which the zero vector can be removed and the second area 702 in the space vector area 700 indicates an area in which the zero vector is not removable but can be reduced .

On the other hand, the first region 701 includes a region 701a (MAX DPWM) which is turned on during the switching period, the smallest switching vector among the three-phase switching vectors, (MIN DPWM).

8A shows the switching control vectors Ta, Tb and Tc before the control, and FIGS. 8B and 8C show the switching vectors Ta, Tb and Tc from which the zero vector is removed .

Particularly, FIG. 8B illustrates that the partial regions 801 and 802 are extended such that the switching vector Ta having the largest one of the three-phase switching vectors is turned on during the switching period.

On the other hand, FIG. 8 (c) illustrates that the timing adjustment is performed such that the smallest switching vector Tc of the three-phase switching vectors is turned off during the switching period.

9 illustrates the switching vectors Ta, Tb, and Tc when the space vector is located within the first area 701. In FIG.

Referring to the drawing, it is illustrated that the ON time of the b-phase switching vector is smaller than half (Ts) of the switching period.

The inverter control unit 430 can control the switching vector Ta that is the largest among the three-phase switching vectors to be turned on throughout the switching period, as shown in Fig. 9B or 9C.

That is, when the turn-on time corresponding to the second-order switching vector Tb of the three-phase switching vectors is smaller than half of the switching period Ts, the inverter control unit 430 outputs the largest switching The vector Ta can be controlled to be turned on throughout the switching period (2Ts).

The inverter controller 430 controls the switching control so that the turn-on time corresponding to the second-largest switching vector Tb of the three-phase switching vector is shifted when controlling the largest switching vector among the three- can do.

On the other hand, when the voltage vector is located in one of the sector 1, the sector 3 and the sector 5 in the space vector region, the inverter control unit 430 determines whether or not the voltage vector corresponding to the switching vector Tb corresponding to the second- The turn-on time can be controlled to move to the right side as shown in Fig. 9 (b).

On the other hand, when the voltage vector is located in one of the sector 2, the sector 4 and the sector 6 in the space vector region, the inverter control unit 430 determines whether the voltage vector corresponding to the switching vector Tb corresponding to the second- The turn-on time can be controlled to move to the left side as shown in Fig. 9 (c).

10 illustrates switching vectors (Ta, Tb, Tc) when the space vector is located within 701b in the first area 701. FIG.

Referring to the drawing, it is illustrated that the ON time of the b-phase switching vector is larger than half (Ts) of the switching period.

The inverter control unit 430 can control to turn off the smallest switching vector Tc among the three-phase switching vectors during the switching period 2Ts, as shown in Fig. 10A or 10B.

That is, when the turn-on time corresponding to the second-order switching vector Tb of the three-phase switching vector is larger than half (Ts) of the switching period, the inverter controller 430 selects the smallest switching The vector Tc can be controlled to be turned off during the switching period 2Ts.

On the other hand, when controlling the smallest switching vector Tc of the three-phase switching vectors to be turned off during the switching period, the inverter control unit 430 controls the inverter control unit 430 to turn on The time can be controlled to be shifted.

On the other hand, when the voltage vector is located in one of the sector 1, the sector 3 and the sector 5 in the space vector region, the inverter control unit 430 determines whether or not the voltage vector corresponding to the switching vector Tb corresponding to the second- The turn-on time can be controlled to move to the right side as shown in Fig. 10 (b).

On the other hand, when the voltage vector is located in one of the sector 2, the sector 4 and the sector 6 in the space vector region, the inverter control unit 430 determines whether the voltage vector corresponding to the switching vector Tb corresponding to the second- The turn-on time can be controlled to move to the left side as shown in Fig. 10 (c).

The inverter control unit 430 can control the voltage vector to operate in the second mode in which the zero vector is reduced when the zero vector is located in the non-removable region.

11A or 11B illustrates the switching vector Tmax, Tmid, Tmin when the space vector is located in the second area 702. FIG.

11A, the inverter control unit 430 controls the switching vector Tb corresponding to the second-largest switching vector Tb of the three-phase switching vector to be turned on during the switching period The turn-on time is shifted to the right, and the turn-on time corresponding to the smallest switching vector Tc among the three-phase switching vectors is shifted to the left.

On the other hand, as shown in FIG. 11B, the inverter controller 430 controls the switching vector Tc, which is the smallest among the three-phase switching vectors, to be turned off during the switching period, On time is shifted to the right side and the turn-on time corresponding to the switching vector Ta having the largest size among the three-phase switching vectors is shifted to the left.

As described above, by shifting the turn-on times of the two-phase switching vectors in the three-phase switching vectors in opposite directions, the zero vector interval can be reduced.

Meanwhile, when the T1 of the effective vector of the voltage vector is greater than T2, the inverter control unit applies the Max DPWM method of FIG. 11A. When T1 is smaller than T2, the inverter control unit may apply the Min DPWM method of FIG. 11B.

11C is a diagram exemplifying the Max DPWM method of FIG. 11A and the Min DPWM method of FIG. 11B.

On the other hand, the inverter control unit 430 can consider the current flowing through the inverter 420 during T1 and T2 to determine the left and right shift directions of the switching vector.

12A shows the currents it1 and it2 flowing to the inverters during T1 and T2 for each sector (sector 1 to 6) in the space vector when the power factor of the motor drive apparatus is 1, Waveforms are illustrated.

12B shows the currents it1 and it2 flowing to the inverters during T1 and T2 for each sector (sectors 1 to 6) in the space vector when the power factor of the motor drive apparatus is 0.7 degrees, that is, .

12A and 12B, in Sectors 1, 3 and 5, the current it1 flowing in the inverter during T1 decreases and the current it2 flowing in the inverter during T2 decreases with time, In Sectors 2, 4, and 6, a current (it1) flowing through the inverter during T1 increases with time, and a current (it1) flowing through the inverter during T2 decreases.

Therefore, it is preferable that the inverter control unit 430 moves the vector movement to the right in Sectors 1, 3, and 5, and to the left in Sectors 2, 4, and 6. As a result, the current flowing into the capacitor arranged at the dc stage can be further reduced.

13 is a flowchart for explaining a method of operating the motor driving apparatus according to the embodiment of the present invention.

The inverter control unit 430 generates the current command value based on the output current flowing to the motor 230, and generates the voltage command value based on the current command value (S1310).

Next, the inverter control unit 430 determines whether the voltage vector corresponding to the voltage instruction value is located in the first area within the space vector area (S1320).

If so, the inverter control unit 430 controls the first mode to be performed. That is, the inverter control unit 430 outputs the first voltage vector from which the zero vector is removed according to the first mode (S1330).

Then, the inverter control unit 430 outputs the first switching control signal according to the first voltage vector (S1340). Accordingly, the inverter 420 drives the switching element in the inverter 420 based on the first switching control signal (S1350).

On the other hand, if the voltage vector corresponding to the voltage instruction value is not located in the first area in the space vector region in step 1320 (S1320), the voltage vector corresponding to the voltage instruction value is located in the second area within the space vector area (S1325).

If so, the inverter control unit 430 controls the second mode to be performed. In other words, the inverter control unit 430 outputs the second voltage vector from which the zero vector is removed according to the second mode (S1335).

Then, the inverter control unit 430 outputs the second switching control signal in accordance with the second voltage vector (S1345). Accordingly, the inverter 420 drives the switching element in the inverter 420 based on the second switching control signal (S1355).

According to this method of operating the motor driving apparatus, the current flowing into the capacitor disposed at the dc stage can be reduced.

Thus, the heat generated in the capacitor disposed in the dc stage can be reduced, and the element stability of the capacitor is improved.

As a result, the capacitance of the capacitor can be reduced. Therefore, the manufacturing cost and the like can be reduced.

On the other hand, since the number of switching times can be reduced for zero vector reduction, the switching loss in the inverter can be reduced.

On the other hand, the motor driving apparatus 220 described above can be applied to various electronic apparatuses. For example, it can be applied to a laundry appliance, an air conditioner, a refrigerator, a water purifier, a cleaner, a vehicle, a robot, a drone, and the like in a home appliance. Various examples of home appliances applicable to the motor driving apparatus 220 will be described below.

14 is a perspective view illustrating a laundry processing apparatus according to an embodiment of the present invention.

Referring to the drawings, a laundry processing apparatus 100a according to an embodiment of the present invention is a front load type laundry processing apparatus in which a bag is inserted into a washing tub in a front direction. Such a front type laundry processing apparatus is a concept including a washing machine in which a bag is inserted and performing washing, rinsing and dewatering, or a dryer in which a wet cloth is inserted to perform drying, and the following description will mainly focus on a washing machine.

The laundry processing apparatus 100a of Fig. 14 is a laundry laundry processing apparatus which is a laundry laundry processing apparatus and includes a cabinet 110 for forming an outer appearance of the laundry processing apparatus 100a, a cabinet 110 disposed inside the cabinet 110, A motor 130 for driving the washing tub 122 and a cabinet 110 disposed outside the cabinet main body 111. The washing tub 122 is disposed inside the cabinet 110, (Not shown) for supplying washing water to the inside of the tub 120 and a drain (not shown) for discharging washing water to the outside.

A plurality of through holes 122A are formed in the washing tub 122 so as to allow washing water to pass therethrough. The washing tub 122 is lifted up to a predetermined height during the rotation of the washing tub 122, (124) may be disposed.

The cabinet 110 includes a cabinet body 111 and a cabinet cover 112 disposed on the front surface of the cabinet body 111 and coupled to the cabinet body 111. The cabinet 110 is disposed above the cabinet cover 112, And a top plate 116 disposed on the control panel 115 and coupled to the cabinet main body 111. The cabinet main body 111 includes a top plate 116,

The cabinet cover 112 includes a catch and release hole 114 formed so as to be able to move in and out of the can and a door 113 arranged to be rotatable in the left and right direction so that the catch and release hole 114 can be opened and closed.

The control panel 115 is provided with operation keys 117 for operating the laundry processing apparatus 100a and a display device (not shown) disposed at one side of the operation keys 117 and for displaying the operation state of the laundry processing apparatus 100a 118).

The operation keys 117 and the display device 118 in the control panel 115 are electrically connected to a control unit (not shown), and a control unit (not shown) electrically controls each component, etc. of the laundry processing apparatus 100a do. The operation of the control unit (not shown) will be described later.

On the other hand, the washing tub 122 may be provided with autobalance (not shown). The autobalance (not shown) is for reducing vibrations caused by the amount of eccentricity of the laundry contained in the washing tub 122, and can be realized by liquid balance, ball balance, or the like.

The laundry processing apparatus 100a may further include a vibration sensor for measuring the vibration amount of the washing tub 122 or the vibration amount of the cabinet 110 although not shown in the drawing.

FIG. 15 is an internal block diagram of the laundry processing apparatus of FIG. 14. FIG.

Referring to the drawings, in the laundry processing apparatus 100a, the driving unit 220 is controlled by the control unit 210, and the driving unit 220 drives the motor 230. As a result, the washing tub 122 is rotated by the motor 230.

The control unit 210 receives an operation signal from the operation key 1017 and performs an operation. Thus, washing, rinsing and dewatering can be performed.

Also, the control unit 210 can control the display 18 to display the washing course, the washing time, the dehydration time, the rinsing time, or the current operation state.

Meanwhile, the control unit 210 controls the driving unit 220 so that the driving unit 220 controls the motor 230 to operate. At this time, a position sensing unit for sensing the rotor position of the motor is not provided inside or outside the motor 230. That is, the driving unit 220 controls the motor 230 by a sensorless method.

2) for detecting an output current flowing through the motor 230 and an inverter (not shown) for driving the motor 230. The drive unit 220 includes an inverter (not shown) And an output voltage detector (F in Fig. 2) for detecting an output voltage vo applied to the motor 230. [ Further, the driving unit 220 may be a concept further including a converter or the like that supplies DC power input to an inverter (not shown).

For example, the inverter control unit (430 in Fig. 2) in the driving unit 220 estimates the rotor position of the motor 230 based on the output current idc and the output voltage vo. Then, based on the estimated rotor position, the motor 230 is controlled to rotate.

Specifically, the inverter control unit 430 of FIG. 2 generates a switching control signal (Sic of FIG. 2) of a pulse width modulation (PWM) method based on the output current idc and the output voltage vo, (Not shown), the inverter (not shown) performs a high-speed switching operation, and supplies AC power of a predetermined frequency to the motor 230. Then, the motor 230 is rotated by an alternating current power source of a predetermined frequency.

On the other hand, the driving unit 220 may correspond to the motor driving device 220 of FIG.

On the other hand, the control unit 210 can detect the discharge amount based on the output current idc flowing to the motor 230 or the like. For example, while the washing tub 122 rotates, the laundry amount can be sensed based on the current value idc of the motor 230.

In particular, the control unit 210 can accurately detect the amount of the battery pack using the stator resistance and the inductance value of the motor measured in the motor alignment interval when the battery pack is detected.

Meanwhile, the controller 210 may sense the amount of eccentricity of the washing tub 122, that is, the unbalance (UB) of the washing tub 122. This eccentricity detection can be performed based on the ripple component of the output current idc flowing to the motor 230 or the rotational speed change amount of the washing tub 122.

In particular, the controller 210 can accurately detect the amount of eccentricity by using the stator resistance and the inductance value of the motor measured in the motor alignment interval at the time of detecting the amount of discharged fluid.

Fig. 16 is a diagram illustrating a configuration of an air conditioner, which is another example of a home appliance according to an embodiment of the present invention.

The air conditioner 100b according to the present invention may include an indoor unit 31b and an outdoor unit 21b connected to the indoor unit 31b as shown in FIG.

The indoor unit 31b of the air conditioner may be any of a stand-type air conditioner, a wall-mounted type air conditioner, and a ceiling type air conditioner, but the stand type indoor unit 31b is exemplified in the figure.

Meanwhile, the air conditioner 100b may further include at least one of a ventilator, an air purifier, a humidifier, and a heater, and may operate in conjunction with the operation of the indoor unit and the outdoor unit.

The outdoor unit 21b includes a compressor (not shown) for receiving and compressing refrigerant, an outdoor heat exchanger (not shown) for exchanging heat between the refrigerant and outdoor air, an accumulator for extracting the gas refrigerant from the supplied refrigerant and supplying it to the compressor And a four-way valve (not shown) for selecting the flow path of the refrigerant according to the heating operation. In addition, a number of sensors, valves, oil recovery devices, and the like are further included, but a description thereof will be omitted below.

The outdoor unit 21b operates the compressor and the outdoor heat exchanger to compress or heat-exchange the refrigerant according to the setting to supply the refrigerant to the indoor unit 31b. The outdoor unit 21b can be driven by a demand of a remote controller (not shown) or the indoor unit 31b. At this time, as the cooling / heating capacity is changed corresponding to the indoor unit to be driven, the number of operation of the outdoor unit and the number of operation of the compressor installed in the outdoor unit can be varied.

At this time, the outdoor unit 21b supplies compressed refrigerant to the connected indoor unit 310b.

The indoor unit 31b receives the refrigerant from the outdoor unit 21b and discharges the cold air to the room. The indoor unit 31b includes an indoor heat exchanger (not shown), an indoor fan (not shown), an expansion valve (not shown) to which refrigerant is supplied, and a plurality of sensors (not shown).

At this time, the outdoor unit 21b and the indoor unit 31b are connected to each other via a communication line to exchange data. The outdoor unit and the indoor unit are connected to a remote controller (not shown) by wire or wireless, can do.

The remote controller (not shown) is connected to the indoor unit 31b, and inputs a control command of the user to the indoor unit, and receives and displays the status information of the indoor unit. At this time, the remote controller can communicate by wire or wireless according to the connection form with the indoor unit.

17 is a schematic view of the outdoor unit and the indoor unit of Fig. 16;

Referring to the drawings, the air conditioner 100b is roughly divided into an indoor unit 31b and an outdoor unit 21b.

The outdoor unit 21b includes a compressor 102b that compresses the refrigerant, an electric motor 102bb that drives the compressor, an outdoor heat exchanger 104b that dissipates the compressed refrigerant, An outdoor fan 105b which is disposed at one side of the heat exchanger 104b and includes an outdoor fan 105ab for accelerating the heat radiation of the refrigerant and an electric motor 105bb for rotating the outdoor fan 105ab and an outdoor fan 105b for expanding the condensed refrigerant An accumulator 103b for temporarily storing the gasified refrigerant to remove water and foreign matter and supplying a refrigerant of a predetermined pressure to the compressor, a compressor 106b for compressing the refrigerant, a cooling / heating switching valve 110b for changing the flow path of the compressed refrigerant, And the like.

The indoor unit 31b includes an indoor heat exchanger 109b disposed inside the room and performing a cooling / heating function, an indoor fan 109ab disposed at one side of the indoor heat exchanger 109b for promoting heat radiation of the refrigerant, And an indoor fan 109b composed of an electric motor 109bb for rotating the fan 109ab.

At least one indoor heat exchanger 109b may be installed. At least one of an inverter compressor and a constant speed compressor can be used as the compressor 102b.

Further, the air conditioner 100b may be constituted by a cooler for cooling the room, or a heat pump for cooling or heating the room.

The compressor 102b in the outdoor unit 21b in Fig. 16 can be driven by a motor driving device, such as the one shown in Fig. 1, which drives the compressor motor 250b.

Alternatively, the indoor fan 109ab or the outdoor fan 105ab may be driven by a motor driving apparatus, such as the one shown in Fig. 1, which drives the indoor fan motor 109bb and the outdoor fan motor 150bb, respectively.

18 is a perspective view illustrating a refrigerator as another example of a home appliance according to an embodiment of the present invention.

The refrigerator 100c according to the present invention includes a case 110c having an inner space divided into a freezing chamber and a refrigerating chamber, a freezing chamber door 120c for shielding the freezing chamber, A refrigerating compartment door 140c is formed on the outer surface of the refrigerating compartment.

A door handle 121c protruded frontward is further provided on a front surface of the freezing compartment door 120c and the refrigerating compartment door 140c so that the user can easily grip the freezing compartment door 120c and the refrigerator compartment door 140c .

Meanwhile, a home bar 180c may be provided on the front of the refrigerator compartment door 140c, which is a means for allowing a user to take out a stored beverage such as a beverage stored in the refrigerator compartment door 140c without opening the refrigerator compartment door 140c.

The dispenser 160c may be provided on the front surface of the freezing chamber door 120c as a convenience means for allowing the user to easily remove ice or drinking water without opening the freezing chamber door 120c. A control panel 210c for controlling the driving operation of the refrigerator 100c and showing the state of the refrigerator 100c in operation can be further provided on the upper side.

In the drawing, the dispenser 160c is disposed on the front surface of the freezing chamber door 120c. However, the dispenser 160c may be disposed on the front surface of the refrigerator chamber door 140c.

On the other hand, an ice-maker 190c for ice-cooling the water supplied from the ice maker using the cool air in the freezing room is provided in the upper portion of the freezing chamber (not shown), and an ice bank (Not shown). Further, although not shown in the drawings, an ice chute (not shown) may be further provided to guide the ice contained in the ice bank 195c to be dropped by the dispenser 160c.

The control panel 210c may include an input unit 220c including a plurality of buttons, and a display unit 230c for displaying a control screen and an operation state.

The display unit 230c displays information such as a control screen, an operating state, and a room temperature. For example, the display unit 230c can display the service type (ice, water, sculptured ice) of the dispenser, the set temperature of the freezer, and the set temperature of the freezer.

The display unit 230c may be implemented as a liquid crystal display (LCD), a light emitting diode (LED), an organic light emitting diode (OLED), or the like. Also, the display unit 230c may be implemented as a touch screen capable of performing the function of the input unit 220c.

The input unit 220c may include a plurality of operation buttons. For example, the input unit 220c includes a dispenser setting button (not shown) for setting the service type (each ice, water, sculpted ice, etc.) of the dispenser, a freezer room temperature setting button (not shown) And a refrigerator compartment temperature setting button (not shown) for setting the freezer compartment temperature. The input unit 220c may be implemented as a touch screen capable of performing a function of the display unit 230c.

Meanwhile, the refrigerator according to the embodiment of the present invention is not limited to the double door type shown in the drawing, but may be a one door type, a sliding door type, a curtain door type (Curtain Door Type).

Fig. 19 is a view schematically showing the configuration of the refrigerator of Fig. 18;

The refrigerator 100c includes a compressor 112c, a condenser 116c for condensing the refrigerant compressed by the compressor 112c, and a condenser 116c for condensing the refrigerant condensed in the condenser 116c, A freezer compartment evaporator 124c disposed in a freezer compartment (not shown), and a freezer compartment expansion valve 134c for expanding the refrigerant supplied to the freezer compartment evaporator 124c.

In the figure, one evaporator is used, but it is also possible to use the evaporator in each of the refrigerating chamber and the freezing chamber.

That is, the refrigerator 100c includes a refrigerating compartment evaporator (not shown) disposed in a refrigerating compartment (not shown), a three-way valve (not shown) for supplying the refrigerant condensed in the condenser 116c to a refrigerating compartment evaporator (Not shown), and a refrigerating compartment expansion valve (not shown) for expanding the refrigerant supplied to the refrigerating compartment evaporator (not shown).

The refrigerator 100c may further include a gas-liquid separator (not shown) in which the refrigerant having passed through the evaporator 124c is separated into a liquid and a gas.

The refrigerator 100c further includes a refrigerator compartment fan (not shown) and a freezer compartment fan 144c that suck the refrigerant that has passed through the freezer compartment evaporator 124c and blow it into a refrigerator compartment (not shown) and a freezer compartment can do.

The refrigerator can further include a compressor driving unit 113c for driving the compressor 112c and a refrigerating compartment fan driving unit (not shown) and a freezing compartment fan driving unit 145c for driving the refrigerating compartment fan (not shown) and the freezing compartment fan 144c have.

In this case, a damper (not shown) may be installed between the refrigerator compartment and the freezer compartment, and a fan (not shown) may be installed between the refrigerator compartment and the freezer compartment, Can be forcedly blown to be supplied to the freezer compartment and the refrigerating compartment.

The compressor 112c of Fig. 19 may be driven by a motor drive device, such as the one shown in Fig. 1, which drives the compressor motor.

Alternatively, a refrigerator compartment fan (not shown) or a freezer compartment fan 144c may be driven by a motor drive device, such as the one shown in Figure 1, that drives a refrigerator compartment fan motor (not shown) and a freezer compartment fan motor .

The motor driving apparatus and the home appliance having the motor driving apparatus according to the embodiments of the present invention can be applied to the configuration and method of the embodiments described above in a limited manner, All or some of the embodiments may be selectively combined.

Meanwhile, the motor driving method or the method of operating the home appliance of the present invention can be implemented as a processor-readable code on a recording medium readable by a processor included in a motor driving apparatus or a home appliance. The processor-readable recording medium includes all kinds of recording apparatuses in which data that can be read by the processor is stored.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.

Claims (12)

A dc-stage capacitor for storing DC power;
An inverter for converting a direct current power from the dc short capacitor to an alternating current power by a switching operation and outputting the converted alternating current power to the motor;
And a control unit for controlling the inverter,
Wherein,
The switching element in the inverter is controlled by the space vector-based pulse width variable control, and when the voltage vector is located in the area where the zero vector can be removed, the operation is performed in the first mode in which the zero vector is removed from the voltage vector Control,
And controls the voltage vector to operate in a second mode in which the zero vector is reduced when the inverse vector is located in the non-removable region, and during the second mode period, the second-order switching vector of the three- And controls the turn-on time corresponding to the second-largest switching vector to be shifted, and controls the turn-on time corresponding to the second-largest switching vector so that the turn- And shifts the turn-on times corresponding to the small-sized switching vectors in opposite directions. The method according to claim 1,
Wherein,
Wherein during the first mode period, control is performed so that a section in which all three-phase upper arm switching elements in the inverter are turned on and a section in which all three-phase upper arm switching elements are turned off do not occur. The method according to claim 1,
Wherein,
And controls to operate in a first mode in which the zero vector is removed when the voltage vector is located in a region where the zero vector can be removed. The method according to claim 1,
Wherein,
During the first mode period,
Wherein the control unit controls the switching vector having the largest one of the three-phase switching vectors to be turned on during the switching period or controls the switching vector of the three-phase switching vector to be turned off during the switching period. 5. The method of claim 4,
Wherein,
During the first mode period,
Phase switching vector is turned on during the switching cycle when the turn-on time corresponding to the switching vector of the second size among the three-phase switching vectors is smaller than half of the switching period,
Phase switching vector is turned off during the switching cycle when the turn-on time corresponding to the second-order switching vector of the three-phase switching vector is greater than half of the switching period. Motor drive device. 5. The method of claim 4,
Wherein,
During the first mode period,
Wherein the control unit controls the turn-on time corresponding to the second-largest switching vector among the three-phase switching vectors to be shifted when the switching vector having the largest one of the three-phase switching vectors is turned on during the switching period,
And controls the switching of the three-phase switching vector so that the turn-on time corresponding to the second-largest switching vector of the three-phase switching vector is shifted when controlling the smallest switching vector among the three- Device. The method according to claim 1,
Wherein,
During the first mode period,
When the voltage vector is located in one of the sector 1, the sector 3 and the sector 5 of the space vector area, the turn-on time corresponding to the second-largest switching vector among the three-phase switching vectors is controlled to move to the right ,
When the voltage vector is located in one of the sector 2, the sector 4, and the sector 6 of the space vector area, the turn-on time corresponding to the second-largest switching vector among the three- The motor driving apparatus comprising: delete The method according to claim 1,
Wherein,
In the second mode,
The control is performed such that the largest switching vector among the three-phase switching vectors is turned on during the switching period, and the turn-on time corresponding to the second-largest switching vector in the three-
And controls the switching of the smallest switching vector among the three-phase switching vectors so that the turn-on time corresponding to the switching vector of the second size among the three-phase switching vectors is shifted while being turned off during the switching period. . A dc-stage capacitor for storing DC power;
An inverter for converting a direct current power from the dc short capacitor to an alternating current power by a switching operation and outputting the converted alternating current power to the motor;
And a control unit for controlling the inverter,
Wherein,
When the voltage vector is located in a region in which the zero vector can be removed, controls to operate in a first mode in which all the three-phase upper-arm switching elements in the inverter are turned on,
And controls the voltage vector to operate in a second mode in which the zero vector is reduced when the inverse vector is located in a non-removable region, wherein during the second mode period, the second-order switching vector of the three- And controls the turn-on time corresponding to the second-largest switching vector to be shifted, and controls the turn-on time corresponding to the second-largest switching vector so that the turn- And shifts the turn-on times corresponding to the small-sized switching vectors in opposite directions. 11. The method of claim 10,
Wherein,
When the three-phase upper-arm switching elements in the inverter are turned on during the switching period, the three-phase upper-arm switching elements in the inverter are all turned on,
And controls the motor so as to operate in a second mode in which all three-phase upper-arm switching elements in the inverter are turned off in a state where the upper-arm switching elements of one phase of the three-phase upper-arm switching elements in the inverter are turned off during the switching period Driving device. A home appliance comprising the motor drive device according to any one of claims 1 to 7 and 9 to 11.

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