KR101727913B1 - 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. A motor driving apparatus according to an embodiment of the present invention includes a converter that converts an input AC power to a DC power and outputs the DC power to a dc stage, a dc-stage capacitor connected to the dc stage and storing a DC power source pulsating from the converter, a dc short-circuit voltage detector for instantly detecting a pulsating direct-current power of the dc short-circuiting capacitor, and a plurality of squeeze switching elements and a lower arm switching element, And a control unit for controlling the inverter. The control unit drives the motor at a constant speed, and when the periodically pulsating DC power from the dc short capacitor reaches the maximum value At a first point in time, the motor is accelerated. Thus, it is possible to stably drive the motor despite the pulsating DC power supply.

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 same, and more particularly, to a motor driving apparatus capable of stably driving a motor despite pulsating DC power, 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.

Recently, a capacitorless motor drive device using a capacitor of a low capacity has been widely used for reasons of reduction in manufacturing cost and the like.

On the other hand, Korean Patent Laid-Open No. 10-2015-0074754 exemplifies a capacitorless motor drive apparatus. However, the capacitorless type motor driving apparatus has a problem that the voltage at the dc stage where the capacitor is located is pulsating.

An object of the present invention is to provide a motor driving apparatus capable of stably driving a motor despite the pulsating DC power supply and a home appliance having the motor driving apparatus.

According to an aspect of the present invention, there is provided a motor driving apparatus including: a converter for converting an input AC power to a DC power and outputting the DC power to a dc stage; A dc terminal voltage detector for instantly detecting a DC power source that pulsates by a dc terminal capacitor, and a plurality of squeeze switching elements and a lower arm switching element, wherein the switching operation causes the pulse wave from the dc- And a control unit for controlling the inverter. The control unit drives the motor at a constant speed, and the control unit controls the motor so as to periodically pulsate the DC power from the dc- And controls the motor to accelerate at a first time point at which the DC power source reaches the maximum value.

According to another aspect of the present invention, there is provided a home appliance comprising: a converter for converting an input AC power source to a DC power source and outputting the DC power source to a dc stage; a DC power source connected to the dc stage, A dc terminal voltage detector for instantly detecting a DC power source that pulsates by a dc terminal capacitor, and a plurality of squeeze switching elements and a lower arm switching element, And a control unit for controlling the inverter. The control unit drives the motor at a constant speed and periodically pulsates pulses from the dc-stage capacitor to generate pulsating pulses The motor is accelerated at a first time point at which the DC power source reaches the maximum value.

According to an embodiment of the present invention, a motor driving apparatus and a home appliance having the motor driving apparatus include a converter that converts input AC power to DC power and outputs the DC power to a dc stage, and a dc- A dc terminal voltage detector for instantly detecting a DC power source pulsating by the dc terminal capacitor, and a plurality of sag-lock switching elements and a down-arm switching element, And a control unit for controlling the inverter. The control unit drives the motor at a constant speed and supplies the alternating-current power to the dc-stage capacitor periodically By controlling the motor to accelerate at a first point of time when the pulsating DC power reaches a maximum value, And it is possible stably to drive the motor.

On the other hand, by continuously raising the motor and controlling the rotational speed of the motor to be variable at a second time point at which the periodically pulsating DC power from the dc short capacitor reaches the maximum value, So that the motor can be driven.

On the other hand, when the motor is driven at a constant speed and the maximum value of the periodically pulsating DC power from the dc-stage capacitor is equal to or greater than the tongue value, the variable-speed time point of the motor is controlled to be delayed from the first time point, .

On the other hand, when the motor is continuously raised, and the maximum value of the periodically pulsating DC power from the dc short capacitor is equal to or greater than the tongue allowance, the variable-speed time point of the motor is controlled to be delayed from the second time point, .

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 illustrates an example of a dc short-circuit voltage.
5 is a diagram referred to in describing an operation method of a motor driving apparatus according to an embodiment of the present invention.
6 to 8B are diagrams referred to in the description of the operation of FIG.
9 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.
10 is an internal block diagram of the laundry processing apparatus of FIG.
11 is a diagram illustrating a configuration of an air conditioner that is another example of a home appliance according to an embodiment of the present invention.
12 is a schematic view of the outdoor unit and the indoor unit of Fig.
13 is a perspective view illustrating a refrigerator that is another example of a home appliance according to an embodiment of the present invention.
14 is a view schematically showing the configuration of the refrigerator of Fig.

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.

A motor driving apparatus 220 according to an embodiment of the present invention drives a motor in a capacitorless manner and includes a converter 410, a dc short capacitor C, An inverter 420, and an inverter control unit 430.

Meanwhile, the motor driving apparatus 220 according to the embodiment of the present invention may further include a dc voltage detection unit B and an output current detection unit E. The motor driving apparatus 220 may further include an input current detecting section A, a reactor L, and the like.

Meanwhile, since the motor driving apparatus 220 according to the embodiment of the present invention uses a small-capacity dc single capacitor C, which is called capacitorless, the voltage across the dc single capacitor C is pulsated do. Particularly, the both-end voltage Vdc of the dc short-circuit capacitor C is pulsated corresponding to the input AC power.

In this case, when the level of the input AC power source is increased or the harmonic component is increased, the dc short pulsation becomes larger and the motor drive becomes unstable.

The present invention proposes a solution for solving this problem.

The motor driving apparatus 220 according to the embodiment of the present invention includes a converter 410 for converting input AC power to DC power and outputting the DC power to the dc stage, A dc terminal voltage detector for momentarily detecting a dc terminal capacitor C for storing a power source Vdc and a dc terminal voltage detector Vdc for pulsating the dc terminal capacitor C, An inverter 420 for converting the DC power source Vdc pulsating from the dc short capacitor C to an AC power source and outputting the converted AC power source to the motor 230 by a switching operation, The inverter control unit 430 drives the motor 230 at a constant speed and supplies a DC power source Vdc periodically pulsating from the dc short capacitor C At the first time point (Ta1 in Fig. 5) at which the maximum value is reached, the motor 230 is accelerated It can be controlled. According to this, the motor 230 can be driven stably despite the pulsating DC power source.

Meanwhile, in the motor driving apparatus 220 according to the embodiment of the present invention, the motor 230 is continuously raised and the DC power source Vdc periodically pulsating from the dc short-circuit capacitor C reaches the maximum value The motor 230 can be stably driven irrespective of the pulsating DC power source Vdc by controlling the rotation speed of the motor 230 to be variable at the second time point (Ta2 in FIG. 5).

On the other hand, when the motor is driven at a constant speed and the maximum value of the periodically pulsating DC power supply Vdc from the dc short-circuit capacitor C is equal to or greater than the tongue value, the rotational speed variation point (Taa1 in Fig. , And is controlled to be delayed from the first time point (Ta1 in FIG. 5), it is possible to stably drive the motor.

On the other hand, when the motor is continuously raised and the maximum value of the periodically pulsating DC power supply Vdc from the dc short capacitor C is equal to or greater than the tongue displacement, Is delayed from the second time point (Ta2 in Fig. 5), it is possible to stably drive the motor.

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 510, a speed calculation unit 520, a current command generation unit 530, a power command generation unit 539, a voltage command generation unit 540, An axis conversion unit 550, and a switching control signal output unit 560.

The axial conversion unit 510 can convert the output currents ia, ib, ic detected by the output current detection unit E into the two-phase currents iα, iβ of the stationary coordinate system.

On the other hand, the axial conversion unit 510 can convert the two-phase current i?, I? Of the still coordinate system into the two-phase current id, iq of the rotational coordinate system.

Based on the output currents (ia, ib, ic) detected by the output current detection section (E), the speed calculation section (520)

), Differentiates the estimated position,

) Can be calculated.

On the other hand, the current command generation section 530 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 unit 530 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 unit 530 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 power command generation unit 539 can generate the power command value based on the dc step voltage (Vdc) detected by the dc step voltage detection unit (B).

For example, the power command generation unit 539 can generate the power command value based on the average value (Vdc_peak_avg) of the peak value of the dc step voltage and the instantaneous value (Vdc_ins) of the dc step voltage.

More specifically, based on the ratio of the average value (Vdc_peak_avg) of the peak value of the dc step voltage to the instantaneous value (ddc_ins) of the dc step voltage, the power command generation unit 539 calculates the power command value Generates a voltage command value based on the power command value, and generates and outputs an inverter 420 switching control signal for controlling the inverter 420 based on the voltage command value.

Here, P ^* denotes a power command value, Vdc_peak_avg denotes an average value of peak values of the dc step voltage, Vdc_ins denotes an instantaneous value of the dc step voltage, and k denotes a proportional constant.

In this way, a power command value is generated based on the average value (Vdc_peak_avg) of the peak value of the dc step voltage and the instantaneous value (Vdc_ins) of the dc step voltage, and the inverter 420 is controlled based on the generated power command value P ^* It is possible to control the operation of the switching element of the switching element. According to this, since the average value of the peak values of the fluctuating dc step voltage is used, it is possible to prevent the phenomenon that the power command value P ^* becomes large, and accordingly, the possibility of fault in driving the motor is considerably lowered, It is possible to stably drive the motor despite the fluctuation of the voltage (Vs or is).

On the other hand, the power command generation unit 539 generates the power command value P ^* based on the dc terminal voltage Vdc detected by the dc terminal voltage detection unit B and the current command value in the current command generation unit 530 Can be generated.

On the other hand, when the motor 230 is a surface permanent magnet synchronous motor (SPMSM) having no rotary polarity, that is, a symmetric type, generation of a current command value, a power command value, and the like with respect to the d axis may be omitted .

If the motor 230 is an Interior Permanent Magnet Synchronous Motor (IPMSM) having a rotary polarity, that is, a non-synchronized type, unlike the drawing, a current command value, a power command value, and the like for the d axis may be generated.

Next, the voltage command generation unit 540 generates the voltage command generation unit 540 based on the d-axis and q-axis currents (i _d , i _q ) axially transformed into the two-phase rotational coordinate system in the axial conversion 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 540 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 . Further, voltage command generation unit 540, on the basis of the difference between the d-axis current (i _d) and, the d-axis current command value (i ^* _d), and performs the PI control in the PI controller (348), d-axis voltage It is possible to generate the command value v ^* _d . The voltage command generator 540 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 , v ^* _q ) are input to the axial conversion unit 550.

The axis transforming unit 550 transforms the position computed by the velocity computing unit 520

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

First, the axis converting unit 550 performs conversion from a two-phase rotating coordinate system to a two-phase stationary coordinate system. At this time, the position computed by the speed calculator 520

) Can be used.

Then, the axis converting unit 550 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 unit 560 generates an inverter switching control signal Sic according to the pulse width modulation (PWM) method based on the three-phase output voltage set values v ^* a, v ^* b and v ^* c 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 560 drives the motor 230 at a constant speed, and at a first point of time when the DC power source Vdc periodically pulsating from the dc short capacitor C reaches the maximum value, (230) to accelerate.

On the other hand, the switching control signal output unit 560 continuously raises the motor 230, and at a second time point when the periodically pulsating DC power supply Vdc from the dc short capacitor C reaches the maximum value, It is possible to control the rotation speed of the motor 230 to be variable.

On the other hand, the switching control signal output unit 560 controls the motor 230 to accelerate in the first mode regardless of the output current flowing to the motor 230, and enters the second mode at the second time point , It is possible to control the rotational speed of the motor 230 to be variable on the basis of the output current flowing to the motor 230. [

The switching control signal output unit 560 controls the motor 230 to drive at a constant speed regardless of the output current flowing to the motor 230 in the first mode, It is possible to control the motor 230 to accelerate at a first time point in the first mode in which the DC power source Vdc pulsating to the maximum value reaches the maximum value.

On the other hand, the switching control signal output unit 560 continuously raises the motor 230, and when the maximum value of the periodically pulsating DC power supply Vdc from the dc short capacitor C is equal to or greater than the tongue potential, 230 can be delayed from the second time point.

4 illustrates an example of a dc short-circuit voltage.

Referring to the drawing, the input AC power source is shown in Fig. 4 (a) in the form of a sine wave.

On the other hand, when a small-capacity dc short-circuit capacitor C of a capacitorless type is used, the dc short-circuit voltage Vdc periodically pulsates in synchronism with the input alternating-current power, as shown in Fig. 4 (b).

FIG. 5 is a diagram for explaining an operation method of a motor driving apparatus according to an embodiment of the present invention, and FIGS. 6 to 8B are diagrams referencing the operation description of FIG.

5 (a), 5 (d) and 5 (d) are graphs showing motor speed waveforms (w in FIG. 5A) The a-phase waveform (ia in (c) of Fig. 5) of the output current is exemplified.

The Pa period in Fig. 5 represents an alignment period for aligning the motor rotor to a predetermined position, and the pb period represents an oppen loop which keeps the speed of the motor constant and accelerates based on the speed command value of the motor ) Period, and the pc period may indicate a sensorless period in which sensorless motor control is performed, based on the motor speed command value and the output current flowing to the motor.

The Tao time in FIG. 5 indicates the start time of the pb period. The Ta1 time point indicates a time point at which the motor 230 is driven at constant speed and accelerated. A time point Ta2 indicates a time point when the pc period starts .

As described above, the dc short-circuit voltage Vdc in FIG. 5 (b) periodically pulsates. Accordingly, at the time when the motor 230 is accelerated or when the control for the motor 230 is variable, , The driving of the motor 230 becomes unstable.

For example, a desired speed command value can not be followed and a step-out may occur.

In order to solve this problem, in the present invention, the dc terminal voltage detecting unit B periodically detects the dc terminal voltage Vdc periodically pulsating, and the inverter controlling unit 430 detects the dc terminal voltage detecting unit B The motor 230 is accelerated or the control for the motor 230 is varied at a time point when the voltage reaches a maximum value among the dc terminal voltage Vdc momentarily detected at the motor 230. [ Thus, the motor 230 can be stably driven despite the dc voltage at the pulsating stage.

5, the inverter control unit 430 drives the motor 230 at a constant speed, and when the DC power source Vdc periodically pulsating from the dc short-circuit capacitor C reaches the maximum value Vpk At the point in time Ta1, the motor 230 can be controlled to be accelerated. Thus, the motor 230 can be stably driven despite the dc voltage at the pulsating stage.

 The inverter control unit 430 continuously raises the motor 230 and at a second time point Ta2 at which the DC power source Vdc periodically pulsating from the dc short capacitor C reaches the maximum value Vpk , So that the rotational speed of the motor 230 can be controlled to be variable. Thus, the motor 230 can be stably driven despite the dc voltage at the pulsating stage.

On the other hand, FIG. 5 (c) shows the a-phase current ia among the output currents. In the Pa period, a constant current flows for motor alignment, sinusoidal current flows and illustrates that a sinusoidal current having a variable frequency flows for the threh variable of the motor during the Pc period.

5C, when the DC power source Vdc periodically pulsating from the dc short-circuit capacitor C reaches the maximum value Vpk at the first time point Ta1 and the second time point Ta2 A stable output current, that is, a-phase current ia appears by accelerating the speed of the motor 230 or varying the control mode of the motor.

On the other hand, the inverter control unit 430 controls the motor 230 to accelerate regardless of the output current flowing into the motor 230 during the Pb period and enters the first mode. At the second time point Ta2, It is possible to control the rotational speed of the motor 230 to be variable on the basis of the output current flowing into the motor 230 in the second mode.

On the other hand, in the first mode, the inverter control unit 430 controls the motor 230 to drive at a constant speed irrespective of the output current flowing to the motor 230, and periodically pulsates from the dc- The motor 230 can be controlled to be accelerated at the first time point Ta1 in the first mode in which the DC power source Vdc reaches the maximum value Vpk.

FIG. 6 is similar to FIG. 5, but there is a difference in that the constant velocity section is omitted during the Pb period. That is, there is a difference in that the Pb1 section including the Ta1 time point is omitted.

According to FIG. 6, the inverter control unit 430 continuously raises the motor 230, and when the DC power source Vdc periodically pulsating from the dc short capacitor C reaches the maximum value Vpk At the time point Ta2, the rotational speed of the motor 230 can be controlled to be variable. Accordingly, the motor 230 can be driven stably despite the dc voltage at the pulsating stage.

On the other hand, Fig. 7 exemplifies the transition from the open-loop period to the sensorless period at the lowest point of time Tx among the pulsating dc voltage Vdc1. In other words, it is illustrated that the motor 230 enters the period in which the speed is variable by the feedback control in the acceleration section of the motor 230. [

In this case, as shown in Fig. 7B, the output current, that is, the deterioration of the motor 230, such as the instantaneous peak of the a-phase current ia, may appear. In addition, the likelihood of burning of circuit elements in the motor driving apparatus 220 can be increased.

The inverter control unit 430 drives the motor 230 at a constant speed and supplies the DC power source Vdc periodically pulsating from the dc short-circuit capacitor C to the DC- The motor 230 can be controlled to be accelerated at the first time point Ta1 at which the maximum value Vpk is reached. Thus, the motor 230 can be stably driven despite the dc voltage at the pulsating stage.

 The inverter control unit 430 continuously raises the motor 230 and outputs the second time point Ta2 at which the periodically pulsating DC power source Vdc from the dc short capacitor C reaches the maximum value Vpk , The rotational speed of the motor 230 can be controlled to be variable. Thus, the motor 230 can be stably driven despite the dc voltage at the pulsating stage.

On the other hand, when the motor 230 is driven at a constant speed and the maximum value Vpk1 of the DC power source Vdc periodically pulsating from the dc short capacitor C is equal to or greater than the tongue value, Similarly, it is possible to control the rotational speed variable time point of the motor 230 to be delayed from the first time point Ta1.

8A illustrates a case where the maximum value Vpk1 of the DC power source Vdc is equal to or greater than the tongue value at the Taao time point of the constant speed rotation of the motor 230. [

Accordingly, the acceleration of the motor 230 can not be immediately performed at the Taao time point of the constant speed rotation section, and the inverter control unit 430 waits until the pulsating DC power source Vdc is stabilized, The speed of the motor 230 can be controlled so that the speed of the motor 230 is accelerated when the maximum value of the pulsating DC power supply Vdc is Vpk.

Compared with the time T1 in FIG. 5, the time point Taa1 may be a point at which it is considerably delayed. However, by this delay operation, the motor 230 can be stably accelerated.

On the other hand, if the maximum value Vpk2 of the DC power source Vdc periodically pulsating from the dc short capacitor C is higher than the tongue displacement value, the inverter control unit 430 continuously raises the motor 230, , It is possible to control the rotation speed variable time point Taa2 of the motor 230 to be delayed from the second time point Ta2 as shown in Fig.

8B illustrates a case where the maximum value Vpk2 of the DC power source Vdc is equal to or greater than the tongue value at the time point Tab2 of the acceleration rotation period of the motor 230. [

Accordingly, the rotation speed of the motor 230 can not be immediately changed at the timing of Tab 2, which is the acceleration rotation period, and the inverter control unit 430 waits until the pulsating DC power source Vdc is stabilized, Similarly, when the maximum value of the pulsating DC power supply Vdc is Vpk, the rotation speed of the motor 230 can be controlled to be variable.

Compared with the time T2 shown in Fig. 5, the time point of Tab3 may be a time point when the time lag is considerably delayed. However, by this delay operation, the motor 230 can be stably accelerated.

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.

9 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 cloth is inserted to perform drying, and the following description will be focused on a washing machine.

The laundry processing apparatus 100a of FIG. 9 is a laundry laundry processing apparatus, which is a laundry laundry processing apparatus comprising 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 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.

10 is an internal block diagram of the laundry processing apparatus of 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.

11 is a diagram illustrating a configuration of an air conditioner that 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.

12 is a schematic view of the outdoor unit and the indoor unit of Fig.

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. 11 can be driven by a motor driving apparatus, 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.

13 is a perspective view illustrating a refrigerator that is 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 defined by a freezing compartment and a refrigerating compartment (not shown), a freezing compartment door 120c for shielding the freezing compartment, 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).

14 is a view schematically showing the configuration of the refrigerator of Fig.

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. 14 can be driven by a motor drive device, such as Fig. 1, which drives a 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 (10)

A converter for converting input AC power to DC power and outputting the DC power to the dc stage;
A dc capacitor connected to the dc stage for storing pulsating DC power from the converter;
A dc step voltage detector for instantly detecting the pulsating DC power of the dc short capacitor;
An inverter for converting the pulsating DC power from the dc capacitor into an AC power and outputting the converted AC power to the motor by a switching operation, the inverter including a plurality of sag lock switching elements and a lower arm switching element;
And a control unit for controlling the inverter,
Wherein,
And controls the motor to be accelerated at a first time point at which the DC power source, which pulsates periodically from the dc-stage capacitor reaches a maximum value, while the motor is driven at a constant speed,
Wherein,
Wherein when the maximum value of the periodically pulsating direct-current power from the dc-stage capacitor is equal to or greater than the first allowable value, the acceleration timing of the motor is delayed from the first timing after the motor is driven at a constant speed. Driving device. The method according to claim 1,
Wherein,
Wherein the controller controls the motor so as to continuously increase the rotation speed of the motor at a second time point at which the periodically pulsating DC power source reaches the maximum value from the dc short capacitor. 3. The method of claim 2,
And an output current detector for detecting an output current flowing in the motor,
Wherein,
In the first mode, controls the motor to accelerate regardless of the output current flowing to the motor,
And controls the motor so that the rotational speed of the motor is varied based on the output current flowing into the motor at the second time point when the second mode is entered. The method of claim 3,
Wherein,
In the first mode, controls the motor to drive at a constant speed regardless of an output current flowing to the motor,
And controls the motor to accelerate at the first time point in the first mode in which the periodically pulsating DC power from the dc short capacitor reaches a maximum value. 3. The method of claim 2,
Wherein,
The motor is continuously raised and the variable speed rotation speed of the motor is delayed from the second speed when the maximum value of the periodically pulsating DC power from the dc short capacitor is equal to or greater than the second allowable value To the motor drive device. delete The method according to claim 1,
Wherein,
wherein the control unit generates a power command value based on the average value of the peak value of the dc step voltage and the instantaneous value of the dc step voltage and controls the operation of the switching element of the inverter based on the generated power command value. Driving device. 8. The method of claim 7,
Wherein,
Generates the power instruction value based on the average value of the peak value of the dc step voltage and an instantaneous value of the dc step voltage and generates a voltage instruction value based on the power instruction value, And generates and outputs an inverter switching control signal for controlling the inverter. The method according to claim 1,
Wherein,
An estimating unit that estimates a speed of the motor based on an output current flowing to the motor;
A current command generator for generating a current command value based on the estimated speed and a speed command value;
A power command generation unit that generates a power command value based on the current command value and the level of the dc step voltage;
A voltage command generator for generating a voltage command value based on the power command value and the current command value; And
And a switching control signal output unit for outputting a switching control signal for driving the inverter based on the voltage command value. A home appliance comprising the motor drive device according to any one of claims 1 to 5 and 7 to 9.

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