KR102035139B1 - Motor driving apparatus and home appliance including the same - Google Patents

Abstract

The present invention relates to a motor driving device, and to a home appliance providing the same. According to an embodiment of the present invention, the motor driving device comprises: a DC terminal resistance element disposed between a DC terminal capacitor and an inverter; an output current detection unit detecting a current flowing through the DC terminal resistance element; and an inverter control unit controlling the inverter based on the detected current. The inverter control unit controls only two switching elements in the inverter to be turned on in accordance with a diagnostic mode, and determines a failure of a phase resistance of the motor when a level of the detected current is outside the allowable range. As a result, in the motor driving device providing the DC terminal resistance element, the failure of the motor and a failure position can be easily grasped.

Description

Motor driving apparatus and home appliance having the same {Motor driving apparatus and home appliance including the same}

The present invention relates to a motor drive device and a home appliance having the same, and more particularly, to a motor drive device having a dc stage resistance element, a motor drive device capable of easily grasping a failure state and a failure location of a motor; It relates to a home appliance having this.

The motor drive device is a device for driving a motor having a rotor for rotating motion and a stator wound with a coil.

On the other hand, the motor drive device, in order to drive the motor, an inverter for outputting the AC power is indispensable.

The inverter can output AC power of various frequencies, and in particular, can operate in response to a motor load.

However, in response to various loads, there is a high possibility that during inverter operation, some of the windings of the motor as well as the inverter are disconnected or shorted.

Therefore, a research on a method of easily determining whether or not the failure of the motor has been performed.

An object of the present invention is to provide a motor drive device and a home appliance having the same, which can easily grasp whether the motor is broken and the location of the failure in the motor drive device having the dc stage resistance element.

The motor drive device and the home appliance having the same according to an embodiment of the present invention for achieving the above object, an output for detecting a current flowing through the dc terminal resistance element and the dc terminal resistance element disposed between the dc terminal capacitor and the inverter; A current detector and an inverter controller for controlling the inverter based on the detected current, wherein the inverter controller controls only two switching elements in the inverter to be turned on according to the diagnostic mode, and the level of the detected current is allowed. If out of range, it is determined that the phase resistance of the motor has failed.

On the other hand, the inverter control unit of the motor driving apparatus according to the embodiment of the present invention calculates the phase resistance of the motor based on the level of the detected current, and if any one of the calculated phase resistance is different, the failure of the phase resistance Can be determined.

Meanwhile, the inverter control unit of the motor driving apparatus according to the embodiment of the present invention controls only two switching elements in the inverter to be sequentially turned on, and in a specific period, when the level of the detected current is different, it is turned on in the corresponding period. The phase resistance corresponding to the non-switching element can be determined as a failure.

On the other hand, the inverter control unit of the motor drive apparatus according to the embodiment of the present invention, if the level of the detected current is within the allowable range, according to the diagnostic mode, can determine the motor to be normal.

Meanwhile, the inverter controller of the motor driving apparatus according to the exemplary embodiment of the present invention may control the turn-on period in which only two switching elements are turned on as the detected temperature is lowered.

Meanwhile, the inverter controller of the motor driving apparatus according to the exemplary embodiment of the present invention may control the diagnostic mode to be performed before the motor alignment period when the motor is driven.

Meanwhile, the inverter controller of the motor driving apparatus according to the exemplary embodiment of the present invention may control only two switching elements in the inverter to output a switching duty signal having a fixed duty to the inverter to turn on.

According to another aspect of the present invention, there is provided a motor driving apparatus and a home appliance including the same, which detects a dc stage resistance element disposed between a dc stage capacitor and an inverter and a current flowing through the dc stage resistance element. An output current detector and an inverter controller for controlling the inverter based on the detected current, wherein the inverter controller controls only two switching elements in the inverter to be sequentially turned on, and in a specific period, the level of the detected current In this other case, the phase resistance corresponding to the switching element that is not turned on in the period is determined to be a failure.

According to an embodiment of the present invention, a motor drive device and a home appliance having the same includes: a dc stage resistor disposed between a dc stage capacitor and an inverter; an output current detector for detecting a current flowing through the dc stage resistor; An inverter controller for controlling the inverter based on the current to be provided, wherein the inverter controller controls only two switching elements in the inverter to be turned on according to the diagnostic mode, and when the level of the detected current is out of the allowable range, It is determined by the failure of the phase resistance of the motor. As a result, in the motor driving apparatus including the dc stage resistance element, it is possible to easily grasp whether the motor is broken or the failure position.

On the other hand, the inverter control unit of the motor driving apparatus according to the embodiment of the present invention calculates the phase resistance of the motor based on the level of the detected current, and if any one of the calculated phase resistance is different, the failure of the phase resistance Can be determined.

Meanwhile, the inverter control unit of the motor driving apparatus according to the embodiment of the present invention controls only two switching elements in the inverter to be sequentially turned on, and in a specific period, when the level of the detected current is different, it is turned on in the corresponding period. The phase resistance corresponding to the non-switching element can be determined as a failure.

On the other hand, the inverter control unit of the motor drive apparatus according to the embodiment of the present invention, if the level of the detected current is within the allowable range, according to the diagnostic mode, can determine the motor to be normal. As a result, in the motor driving apparatus including the dc stage resistance element, it is possible to easily grasp whether the motor is broken or the failure position.

Meanwhile, the inverter controller of the motor driving apparatus according to the exemplary embodiment of the present invention may control the turn-on period in which only two switching elements are turned on as the detected temperature is lowered. Accordingly, in the diagnostic mode, preheating of the motor may be performed.

Meanwhile, the inverter controller of the motor driving apparatus according to the exemplary embodiment of the present invention may control the diagnostic mode to be performed before the motor alignment period when the motor is driven. Accordingly, it is possible to prevent burnout of the motor. .

Meanwhile, the inverter controller of the motor driving apparatus according to the exemplary embodiment of the present invention may control only two switching elements in the inverter to output a switching duty signal having a fixed duty to the inverter to turn on. Accordingly, the diagnostic mode can be stably performed.

According to another aspect of the present invention, there is provided a motor driving apparatus and a home appliance including the same, which detects a dc stage resistance element disposed between a dc stage capacitor and an inverter and a current flowing through the dc stage resistance element. An output current detector and an inverter controller for controlling the inverter based on the detected current, wherein the inverter controller controls only two switching elements in the inverter to be sequentially turned on, and in a specific period, the level of the detected current In this other case, the phase resistance corresponding to the switching element that is not turned on in the period is determined to be a failure. As a result, in the motor driving apparatus including the dc stage resistance element, it is possible to easily grasp whether the motor is broken or the failure position.

1 illustrates an example of an internal block diagram of a motor driving apparatus according to an embodiment of the present invention.
FIG. 2 is an example of an internal circuit diagram of the motor driving device of FIG. 1.
3 is an internal block diagram of the inverter controller of FIG. 2.
4 is a diagram illustrating an example of an output current detector.
5 is a diagram illustrating an example of an output current detector of a motor driving apparatus according to an exemplary embodiment of the present invention.
6 is a flowchart illustrating a method of operating a motor driving apparatus according to an exemplary embodiment of the present invention.
7A to 9C are views referred to for describing the operating method of FIG. 6.
10 is a perspective view illustrating a laundry treatment device as an example of a home appliance according to an exemplary embodiment of the present invention.
11 is an internal block diagram of the laundry treatment machine of FIG.
12 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.
FIG. 13 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 12. FIG.
14 is a perspective view illustrating a refrigerator that is another example of a home appliance according to an exemplary embodiment of the present invention.
FIG. 15 is a view schematically illustrating a configuration of the refrigerator of FIG. 14.

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

The suffixes "module" and "unit" for components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not impart any particular meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably.

The motor driving apparatus described herein estimates the rotor position of the motor by a sensorless method, which is not provided with a position sensing unit such as a hall sensor that senses the rotor position of the motor. It can be a motor drive. Hereinafter, a sensorless motor drive device will be described.

On the other hand, the motor drive device 220 according to an embodiment of the present invention may be referred to as a motor drive unit.

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

Referring to the drawings, the motor drive device 220 according to an embodiment of the present invention, for driving the motor in a sensorless (sensorless) method, the inverter 420, the inverter controller 430, the temperature sensing unit 232 may include.

In addition, the motor driving apparatus 220 according to the embodiment of the present invention may include a converter 410, a dc end voltage detector B, a dc end capacitor C, and an output output current detector Edc. In addition, the motor driving device 220 may further include an input output current detector A, a reactor L, and the like.

The motor driving apparatus 220 according to the exemplary embodiment of the present invention detects a phase current by using one dc stage resistor Rdc disposed between the dc stage capacitor and the inverter.

In this case, the inverter controller 430 controls the switching device in the inverter 420 by controlling the variable width of the pulse vector based on the space vector.

To this end, the inverter controller 430 receives phase current information sequentially detected by using one dc stage resistance element, and based on this, in the inverter 420, by controlling a variable width of a pulse vector based on a space vector. The switching element can be controlled.

On the other hand, in the case of using one dc stage resistance element (Rdc), since the phase current must be detected sequentially, when the failure of the motor 230, in particular the winding failure of the motor 230, whether any of three phases and It is not easy to locate the fault.

Accordingly, the present invention proposes a method for easily grasping a failure state and a failure position of the motor 230 in the motor driving field 220 value of one dc stage resistance element Rdc.

To this end, the motor driving device 220 according to an embodiment of the present invention, the inverter 420, the dc stage resistor (Rdc) disposed between the dc terminal capacitor and the inverter 420, and the dc stage resistor ( An output current detector Edc for detecting a current flowing through Rdc, and an inverter controller 430 for controlling the inverter 420 based on the detected current.

In addition, the inverter controller 430 controls only two switching elements in the inverter 420 to be turned on according to the diagnostic mode, and when the level of the detected current is outside the allowable range, the inverter controller 430 controls the phase resistance of the motor 230. Judging by the failure. Accordingly, in the motor 230 driving apparatus including the dc stage resistance element Rdc, it is possible to easily grasp whether the motor 230 is broken and the location of the failure.

Meanwhile, the inverter controller 430 of the motor 230 driving apparatus according to the embodiment of the present invention calculates the phase resistance of the motor 230 based on the detected level of the current, and calculates any one of the calculated phase resistances. If is different, it can be determined as a failure of the phase resistance.

Meanwhile, the inverter controller 430 of the motor 230 driving apparatus according to the embodiment of the present invention controls only two switching elements in the inverter 420 to be turned on sequentially, and in a specific period, the level of the detected current. In this other case, the phase resistance corresponding to the switching element that is not turned on in the period can be determined as a failure.

Meanwhile, the inverter controller 430 of the motor 230 driving apparatus according to the exemplary embodiment of the present invention may determine the motor 230 to be normal when the detected current level is within an allowable range according to the diagnostic mode. have. Accordingly, in the motor 230 driving apparatus including the dc stage resistance element Rdc, it is possible to easily grasp whether the motor 230 is broken and the location of the failure.

On the other hand, the inverter controller 430 of the motor 230 driving apparatus according to an embodiment of the present invention, the lower the sensed temperature, the longer the turn-on period in which only two switching elements are turned on may be controlled. Accordingly, in the diagnostic mode, preheating of the motor 230 may be performed.

The inverter controller 430 of the motor 230 driving apparatus according to the exemplary embodiment of the present invention may control the diagnostic mode to be performed before the motor 230 alignment period when the motor 230 is driven. Accordingly, burnout of the motor 230 can be prevented.

On the other hand, the inverter control unit 430 of the motor 230 driving apparatus according to an embodiment of the present invention, to turn on only two switching elements in the inverter 420, the switching control signal of a fixed duty to the inverter 420 You can control the output. Accordingly, the diagnostic mode can be stably performed.

Motor 230 driving apparatus and a home appliance having the same according to another embodiment of the present invention for achieving the above object, a dc stage resistance element (Rdc) disposed between the dc stage capacitor (C) and the inverter 420 And an output current detector Edc for detecting a current flowing through the dc stage resistance element Rdc, and an inverter controller 430 for controlling the inverter 420 based on the detected current. ) Controls only two switching elements in the inverter 420 to be turned on sequentially, and in a certain period, if the level of detected current is different, the phase resistance corresponding to the switching element not turned on in that period fails. Determined by Accordingly, in the motor 230 driving apparatus including the dc stage resistance element Rdc, it is possible to easily grasp whether the motor 230 is broken and the location of the failure.

Hereinafter, the operation of each component unit in the motor driving apparatus 220 of FIGS. 1 and 2 will be described.

The reactor L is disposed between the commercial AC power supplies 405 and v _s and the converter 410 to perform power factor correction or boost operation. In addition, the reactor L may perform a function of limiting harmonic currents due to the fast switching of the converter 410.

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

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

Meanwhile, the converter 410 may be formed of a diode or the like without a switching element, and may perform rectification without a separate switching operation.

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

On the other hand, the converter 410, for example, a half-bridge type converter that is connected to two switching elements and four diodes may be used, and in the case of a three-phase AC power supply, six switching elements and six diodes may be used. .

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

The dc terminal capacitor C smoothes the input power and stores it. In the figure, two devices are illustrated as the dc terminal capacitor C, but a plurality of devices may be provided to secure device stability.

On the other hand, in the drawing, but is illustrated as being connected to the output terminal of the converter 410, not limited to this, a direct current power may be input directly, for example, the direct current power from the solar cell is a dc terminal capacitor (C) It may be input directly to the DC or DC / DC conversion. Hereinafter, the parts illustrated in the drawings will be mainly described.

On the other hand, since the DC power is stored at both ends of the dc terminal capacitor C, this may be referred to as a dc terminal or a dc link terminal.

The dc end voltage detector B may detect a dc end voltage Vdc that is both ends of the dc end capacitor C. To this end, the dc terminal voltage detector B may include a resistor, an amplifier, and the like. The detected dc terminal voltage Vdc may be input to the inverter controller 430 as a discrete signal in the form of a pulse.

The inverter 420 includes a plurality of inverter switching elements, converts the smoothed DC power supply Vdc into three-phase AC power supplies va, vb and vc of a predetermined frequency by turning on / off an operation of the switching device, It may output to the synchronous motor 230.

Inverter 420 is a pair of upper arm switching elements Sa, Sb, Sc and lower arm switching elements S'a, S'b, S'c, which are connected in series with each other, and a total of three pairs of upper and lower arms The switching elements are connected in parallel with each other (Sa & S'a, Sb & S'b, Sc & S'c). Diodes are connected in anti-parallel to each of the switching elements Sa, S'a, Sb, S'b, Sc, and 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. As a result, the three-phase AC power supply having the predetermined frequency is output to the three-phase synchronous motor 230.

The inverter controller 430 may control a switching operation of the inverter 420 based on a sensorless method. To this end, the inverter controller 430 may receive an output current i _o detected by the output output current detector Edc.

The inverter controller 430 outputs an 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 a switching control signal of the pulse width modulation method PWM, and is generated and output based on the output current i _o detected by the output output current detection unit Edc. A detailed operation of the output of the inverter switching control signal Sic in the inverter controller 430 will be described later with reference to FIG. 3.

The output output current detection unit Edc uses the dc stage resistance element Rdc disposed between the dc stage capacitor C and the inverter 420 to output the output current i _o flowing between the three-phase motor 230. Detect.

In particular, the output output current detector Edc may sequentially detect the output currents ia, ib and ic of each phase.

To this end, the output output current detector Edc may include a CT (current trnasformer) or the like.

The detected output current i _o , as a discrete signal in the form of a pulse, may be applied to the inverter controller 430, and the inverter switching control signal Sic based on the detected output current i _o . Is generated. Hereinafter, the detected output current i _o may be described in parallel as the three-phase output currents ia, ib and ic.

On the other hand, the three-phase motor 230 is provided with a stator and a rotor, each phase AC power of a predetermined frequency is applied to the coil of the stator of each phase (a, b, c phase), the rotor rotates Will be

Such a motor 230 may be, for example, a Surface-Mounted Permanent-Magnet Synchronous Motor (SMPMSM), an Interior Permanent Magnet Synchronous Motor (IPMSM), and a synchronous clock. Synchronous Reluctance Motor (Synrm) and the like. Of these, SMPMSM and IPMSM are permanent magnet synchronous motors (PMSMs) with permanent magnets, and synrms have no permanent magnets.

3 is an internal block diagram of the inverter controller of FIG. 2.

Referring to FIG. 3, the inverter controller 430 may include an axis converter 310, a speed calculator 320, a current command generator 330, a voltage command generator 340, an axis converter 350, and The switching control signal output unit 360 may be included.

The axis conversion unit 310 may convert the three-phase current (ia, ib, ic) or the estimated current detected by the output current detection unit (Edc) into the two-phase current (iα, iβ) of the stationary coordinate system. have.

On the other hand, the axis conversion unit 310 can convert the two-phase current (iα, iβ) of the stationary coordinate system into a two-phase current (id, iq) of the rotary coordinate system.

)와 연산된 속도(

)를 출력할 수 있다.The speed calculator 320 calculates the calculated position (based on the two-phase currents iα and iβ of the stationary coordinate system axially changed by the axis converter 310.

) And computed speed (

) Can be printed.

)와 속도 지령치(ω^* _r)에 기초하여, 전류 지령치(i^* _q)를 생성한다. 예를 들어, 전류 지령 생성부(330)는, 연산 속도(

)와 속도 지령치(ω^* _r)의 차이에 기초하여, PI 제어기(335)에서 PI 제어를 수행하며, 전류 지령치(i^* _q)를 생성할 수 있다. 도면에서는, 전류 지령치로, q축 전류 지령치(i^* _q)를 예시하나, 도면과 달리, d축 전류 지령치(i^* _d)를 함께 생성하는 것도 가능하다. 한편, d축 전류 지령치(i^* _d)의 값은 0으로 설정될 수도 있다. On the other hand, the current command generation unit 330 has a calculation speed (

) And the current command value i ^* _q based on the speed command value ω ^* _r . For example, the current command generation unit 330 has a calculation speed (

) Based on the difference between the speed command value ω ^* _r and the PI controller 335, the PI control may be performed, and the current command value i ^* _q may be generated. In the drawing, although the q-axis current command value i ^* _q is illustrated as a current command value, it is also possible to generate | generate a d-axis current command value i ^* _d unlike a 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 330 may further include a limiter (not shown) for restricting the level so that the current command value i ^* _q does not exceed the allowable range.

Next, the voltage command generation unit 340 includes the d-axis and q-axis currents i _d and i _q which are axis-converted in the two-phase rotation coordinate system by the axis conversion unit, and the current command value (such as the current command generation unit 330). Based on i ^* _d , i ^* _q ), the d-axis and q-axis voltage command values v ^* _d and v ^* _q are generated. For example, the voltage command generation unit 340 performs the 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 , and q The axial voltage setpoint v ^* _q can be generated. In addition, the voltage command generation unit 340 performs the 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 , and the d-axis voltage The setpoint (v ^* _d ) can be generated. On the other hand, the voltage command generation unit 340 may further include a limiter (not shown) for restricting the level so that the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) do not exceed the allowable range. .

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

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis conversion unit 350 may be a position calculated by the speed calculating unit 320 (

), And the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) are input, and axis conversion is performed.

)가 사용될 수 있다.First, the axis conversion unit 350 converts from a two-phase rotation coordinate system to a two-phase stop coordinate system. At this time, the position calculated by the speed calculating unit 320 (

) Can be used.

In addition, the axis conversion unit 350 performs a transformation from the two-phase stop coordinate system to the three-phase stop coordinate system. Through this conversion, the axis conversion unit 1050 outputs the three-phase output voltage command values v ^* a, v ^* b, v ^* c.

The switching control signal output unit 360 generates the switching control signal Sic for the inverter based on the pulse width modulation (PWM) method based on the three-phase output voltage command values (v ^* a, v ^* b, v ^* c). To print.

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

On the other hand, as described above, the motor drive device 220, through the control of the inverter 420, in order to perform the vector control for driving the motor 230, the output current (io) flowing through the motor (motor) In particular, it is essential to detect phase current.

The inverter controller 430 may control the motor 230 at a desired speed and torque by using the current command generator 330 and the voltage command generator 340 by using the sensed phase current. Will be.

4 is a diagram illustrating an example of an output current detector.

Referring to the drawings, the output current detector Ex of FIG. 4 includes two current sensors CSa for sensing a phase current and c phase current among three phase currents a, b, and c current flowing through the motor 230. And having CSc).

On the other hand, the b-phase current can be calculated using the condition that the sum of the three-phase current is zero.

On the other hand, the method of sensing the motor current by using a resistance element of one dc stage, as shown in FIG. 5, rather than the method of FIG. 4, the manufacturing cost is reduced, it is easy to install.

Accordingly, in the present invention, a method of sensing a motor current using a single shunt resistor element as shown in FIG. 5 will be described.

5 is a diagram illustrating an example of an output current detector of a motor driving apparatus according to an exemplary embodiment of the present invention.

Referring to the drawings, the output current detector Edc may include a dc stage resistor Rdc disposed between the dc stage capacitor C and the inverter 420.

The inverter controller 430 may calculate the current flowing in the motor 230 based on the current flowing through the dc stage resistance element Rdc, and control the inverter 420 based on the calculated motor current.

As shown in the drawing, a current acquisition method using a dc stage resistance element Rdc is called a shunt algorithm.

The shunt algorithm is classified into 1-shunt, 2-shunt, and 3-shunt according to the position and the number of shunt resistor elements. In the present invention, the 1-shunt method is used. Describe it.

According to this one-shunt method, three-phase currents (a, b, c phase currents) flowing through the motor 230 are obtained using only two shunt resistor elements disposed in the dc stage.

Therefore, compared to FIG. 4, the current sensor can be reduced, and compared to the 2-shunt and 3-shunt methods, peripheral circuits such as a voltage amplifier and an A / D port can be reduced. In addition, the manufacturing cost and volume of the motor driving device 220 may be reduced.

The motor driving apparatus 220 according to the embodiment of the present invention detects the phase current by using one dc stage resistor disposed between the dc stage capacitor and the inverter.

6 is a flowchart illustrating a method of operating a motor driving apparatus according to an exemplary embodiment of the present invention, and FIGS. 7A to 9C are views referred to for describing the operating method of FIG. 6.

Referring to the drawing, the inverter controller 430 may control to perform a diagnostic mode when the power is on or in response to a user input (S610).

In this case, the diagnostic mode is for protecting the motor 230, the inverter 420, and the like. In particular, the diagnostic mode may be performed to determine whether or not the motor 230 has a failure, a failure location, and the like.

Accordingly, the inverter controller 430 may control the diagnostic mode to be performed before the motor alignment period when the motor is driven.

On the other hand, if the preheating of the motor is necessary before the motor alignment period, the diagnostic mode may be performed before the motor preheating period.

Alternatively, the inverter controller 430 may control the diagnostic mode and the preheat mode to be performed together.

When the diagnostic mode and the preheat mode are performed together, the inverter controller 430 may control the diagnostic mode period to vary according to the temperature around the motor sensed by the temperature sensor 232.

In particular, the inverter controller 430 may control the longer the duration of the diagnostic mode for preheating as the temperature around the motor detected by the temperature sensor 232 is lower.

More specifically, the inverter controller 430 controls the longer the period in which only two switching elements of the inverter 420 are turned on for preheating as the temperature around the motor detected by the temperature sensor 232 is lower. can do.

Next, the inverter controller 430 may control only two switching elements in the inverter 420 to be turned on as the diagnosis mode starts (S615).

Next, the inverter controller 430 determines whether the level of the current Idc sequentially detected by the output current detector Edc is outside the allowable range (S620), and if applicable, based on a current outside the allowable range. It may be determined that the phase resistance of the motor 230 or more (S625).

On the other hand, when the level of the current Idc detected by the output current detector Edc is within the allowable range, the inverter controller 430 may determine that the motor 230 is normal ( S645).

7A to 8 are views referring to whether or not a motor malfunctions according to on of two switching elements.

FIG. 7A shows the first upper arm switching element Sa and the second lower arm switching element S'b among the plurality of upper arm switching elements Sa to Sc and the lower arm switching elements S'a to S'c in the P1 period. ) Only turns on, and the remaining four switch elements are turned off.

According to this, it is normal that the current flowing through the first upper arm switching element Sa and the second lower arm switching element S'b is detected along path1.

Meanwhile, the motor 230 may be modeled as phase resistances Ra, Rb, and Rc and phase inductances La, Lb, and Lc as shown in the drawing.

According to the path1, when the first phase arm switching element Sa and the second lower arm switching element S'b flow, current also flows in the a phase resistance Ra and the b phase resistance Rb.

On the other hand, the inverter controller 430 according to the path1, when the level of the current flowing out of the allowable range (irag), that is, a level larger or smaller than the allowable range, a phase resistance (Ra) and b It can be determined that the phase resistance Rb is abnormal.

On the other hand, the inverter control unit 430 may determine that the a-phase resistance Ra and the b-phase resistance Rb are normal when the level of the current flowing in the path1 is within the allowable range irag.

FIG. 7B shows a first upper arm switching element Sa and a third lower arm switching element S'c of the plurality of upper arm switching elements Sa to Sc and the lower arm switching elements S'a to S'c in the period P2. ) Only turns on, and the remaining four switch elements are turned off.

According to this, it is normal that the current flowing through the first upper arm switching element Sa and the third lower arm switching element S'c is detected along path2.

According to the path2, when the first phase arm switching element Sa and the third lower arm switching element S'c flow, current also flows in the a phase resistance Ra and the c phase resistance Rc.

On the other hand, the inverter controller 430 according to the path2, when the level of the current flowing out of the allowable range (irag), that is, a level larger or smaller than the allowable range, the a-phase resistance (Ra) and c It can be determined that the phase resistance Rc is abnormal.

On the other hand, the inverter control unit 430 may determine that the a-phase resistance Ra and the c-phase resistance Rc are normal when the level of the current flowing in the path2 is within the allowable range irag.

FIG. 7C shows a second upper arm switching element Sb and a third lower arm switching element S'c of the plurality of upper arm switching elements Sa to Sc and the lower arm switching elements S'a to S'c during the period P3. ) Only turns on, and the remaining four switch elements are turned off.

According to this, it is normal that the current flowing through the second upper arm switching element Sb and the third lower arm switching element S'c is detected along the path3.

According to the path 3, when the second phase arm switching element Sb and the third lower arm switching element S'c flow, current also flows in the b-phase resistor Rb and the c-phase resistor Rc.

On the other hand, the inverter control unit 430, according to the path3, when the level of the current flowing out of the allowable range (irag), that is, a level larger or smaller than the allowable range, b-phase resistance (Rb) and c It can be determined that the phase resistance Rc is abnormal.

On the other hand, the inverter control unit 430 may determine that the b-phase resistor Rb and the c-phase resistor Rc are normal when the level of the current flowing in the path3 is within the allowable range irag.

Similar to FIGS. 7A-7C, in the P1 through P6 periods, the two lower arm switching elements can be turned on, respectively, as shown in FIG. 8, whereby the three-phase resistors Ra and Rb of the motor 230. It is possible to determine the presence or absence of any abnormality with respect to any phase resistance of, Rc).

Meanwhile, the inverter controller 430 may control to output only a switching duty signal Sic having a fixed duty to the inverter 420 to turn on only two switching elements in the inverter 420 when the diagnostic mode is performed. . For example, the switching control signal Sic having a fixed duty of about 20% or less may be output to the inverter 420. Accordingly, the diagnostic mode can be stably performed.

FIG. 8 is a diagram showing the on timings of the two switching elements in the inverter sequentially from the P1 period to the P6 period, whereby the detected current Idc and the detectable phase resistance are respectively illustrated.

FIG. 9A illustrates the current waveform idca1 when it is detected by the output current detector Edc in the state where only two switching elements are turned on during the above-described P1 to P6 periods.

As shown in the figure, when only two switching elements are turned on, when the level of the current waveform idca1 is constant during the periods P1 to P6, the inverter controller 430, the three-phase resistor (Ra, in the motor 230) It can be determined that both Rb and Rc are normal.

Next, FIG. 9B illustrates a current waveform idca2 when the output current detector Edc is detected while only two switching elements are turned on during the above-described P1 to P6 periods.

In the figure, only in the periods P3 and P6, the level of the current waveform idca2 is in the allowable range Irag, and in the periods P1, P2, P4, and P5, the level of the current waveform idca2 is the allowable range Irag. For example, out of

As described above, when the current waveform idca2 of FIG. 9B is detected, the inverter controller 430 determines that the phase resistance corresponding to the periods P1, P2, P4, and P5 is abnormal, and corresponds to the periods P3 and P6. The phase resistance can be determined to be normal.

That is, the inverter control unit 430 determines that the b-phase resistance Ra and the c-phase resistance Rc corresponding to the P3 period and the P6 period are normal, and the common phase resistance in the P1, P2, P4, and P5 periods. It can be determined that the a-phase resistance Ra corresponding to the abnormality.

That is, the inverter controller 430 may determine that the a phase winding in the motor 230 is abnormal, and may control such information to output an audio output unit (not shown) or a display (not shown).

Accordingly, the installer or the user can easily grasp that the abnormality is in the a-phase winding in the rotor 230.

On the other hand, when the inverter controller 430 sequentially turns on only two switching elements, the inverter control unit 430 calculates the phase resistance of the motor 230 based on the detected current level, and any one of the calculated phase resistances is different. In this case, it can be determined that the phase resistance is broken.

Meanwhile, the inverter controller 430 controls only two switching elements in the inverter 420 to be sequentially turned on, and in a specific period, when the level of the detected current is different, the inverter control unit 430 controls the switching elements that are not turned on in the corresponding period. The corresponding phase resistance can be determined to be a failure.

That is, as illustrated in FIG. 9B, when the current level during the P3 period and the P6 period is Lv2, and the current level during the P1, P2, P4, and P5 periods is Lv1, the inverter controller 430 performs the P3 period and the P6 period. It can be determined that the a-phase resistance Ra corresponding to the switching element that is not turned on during the period is abnormal. Accordingly, in the motor 230 driving apparatus including the dc stage resistance element Rdc, it is possible to easily grasp whether the motor 230 is broken and the location of the failure.

9A to 9B, the widths of the respective periods of the P1 to P6 periods are equal to Tex1.

The inverter controller 430 may control the width of each period of the P1 to P6 periods to be set to Tex1 when the temperature sensed by the temperature sensing unit 232 is about 15 degrees or more.

On the other hand, when the temperature detected by the temperature sensor 232 is approximately 5 degrees or less, the inverter controller 430 controls the width of each period of the P1 to P6 periods to be set to a Tex2 period wider than Tex1 for preheating. can do. This will be described with reference to FIG. 9C.

FIG. 9C illustrates the current waveform idca3 when the output current detector Edc is detected while only two switching elements are turned on during the periods P'1 to P'6 in which the width of the period is Tex2. .

As shown in the figure, when only two switching elements are on, and when only two switching elements are on, when the level of the current waveform idca1 is constant during the periods P1 to P6, the inverter control unit 430, It can be determined that all three-phase resistors Ra, Rb, and Rc in the motor 230 are normal.

On the other hand, when the above-described determination of the failure of the phase resistance of the motor, etc. in the motor drive device 220 is performed, the inverter controller 430, through an audio output unit (not shown) or a display (not shown), The failure information can be controlled to be output. In particular, it is possible to control such that the failure location, failure type information and the like are output.

On the other hand, the above-described motor driving device 220 may be provided and used in various devices. For example, the home appliance may be used for a laundry treatment device, an air conditioner, a refrigerator, a water purifier, a cleaner, and the like. In addition, the present invention can be applied to a vehicle, a robot, a drone, and the like, which can be operated by a motor.

10 is a perspective view showing a laundry treatment apparatus according to an embodiment of the present invention.

Referring to the drawings, the laundry treatment machine 100a according to an embodiment of the present invention is a laundry machine of a front load type in which a cloth is inserted into a washing tank in a front direction. The laundry treatment apparatus of the front type is a concept including a washing machine in which a cloth is inserted to perform washing, rinsing and dehydration, or a dryer in which a wet cloth is inserted to perform drying. Hereinafter, a washing machine will be described.

The laundry treatment apparatus 100a of FIG. 10 is a laundry tub laundry treatment apparatus, and includes a cabinet 110 that forms an exterior of the laundry treatment apparatus 100a and a cabinet 110, and is supported by the cabinet 110. The tub 120, the tub 120 is disposed inside the tub 120 is washed with cloth, the motor 130 for driving the washing tank 122, and the cabinet 110 is disposed outside the cabinet 110 It includes a washing water supply device (not shown) for supplying the wash water therein, and a drainage device (not shown) formed under the tub 120 to discharge the wash water to the outside.

A plurality of through holes 122A are formed in the washing tub 122 to allow the washing water to pass therethrough, and when the laundry is rotated, the laundry is lifted to a certain height and then lifted on the inner side of the washing tub 112 so as to fall by gravity. 124 may be deployed.

The cabinet 110 includes a cabinet main body 111, a cabinet cover 112 disposed at the front of the cabinet main body 111 and coupled thereto, and a control disposed at the upper side of the cabinet cover 112 and coupled with the cabinet main body 111. The panel 115 and a top plate 116 disposed above the control panel 115 and coupled to the cabinet body 111 are included.

The cabinet cover 112 includes a fabric access hole 114 formed to allow the fabric to enter and exit, and a door 113 disposed to be rotatable from side to side to allow the fabric access hole 114 to be opened and closed.

The control panel 115 is provided with operation keys 117 for operating the operation state of the laundry processing apparatus 100a and a display device disposed on one side of the operation keys 117 and displaying an 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 an inverter control unit (not shown), and the inverter control unit (not shown) electrically connects each component of the laundry processing apparatus 100a. To control. The operation of the inverter controller (not shown) will be described later.

On the other hand, the washing tank 122 may be provided with an auto balance (not shown). Auto balance (not shown) is to reduce the vibration caused by the eccentric amount of the laundry contained in the washing tank 122, it may be implemented as a liquid balance, ball balance and the like.

On the other hand, although not shown in the figure, the laundry treatment apparatus 100a may further include a vibration sensor for measuring the vibration amount of the washing tank 122 or the vibration amount of the cabinet 110.

11 is an internal block diagram of the laundry treatment machine of FIG.

Referring to the drawings, in the laundry treatment apparatus 100a, the driving unit 220 is controlled by the control operation of the inverter control unit 210, and the driving unit 220 drives the motor 230. Accordingly, the washing tank 122 is rotated by the motor 230.

The inverter controller 210 receives an operation signal from the operation key 1017 and operates. Accordingly, washing, rinsing, and dehydration strokes can be performed.

In addition, the inverter controller 210 may control the display 18 to display a washing course, a washing time, a dehydration time, a rinsing time, or a current operation state.

On the other hand, the inverter control unit 210 controls the drive unit 220, and the drive unit 220 controls the motor 230 to operate. At this time, inside or outside the motor 230, a position sensing unit for sensing the rotor position of the motor is not provided. That is, the driving unit 220 controls the motor 230 by a sensorless method.

The drive unit 220 is for driving the motor 230, and an output output current detector (Edc of FIG. 2) for detecting an output current flowing through an inverter (not shown), an inverter controller (not shown), and the motor 230. ) And an output voltage detector (F in FIG. 2) for detecting the output voltage vo applied to the motor 230. In addition, the driving unit 220 may be a concept that further includes a converter, which supplies a DC power input to an inverter (not shown).

For example, the inverter controller 430 in FIG. 2 in the driver 220 estimates the rotor position of the motor 230 based on the output current io 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 the pulse width modulation (PWM) method based on the output current io and the output voltage vo, thereby inverting the inverter. When outputting to (not shown), the inverter (not shown) performs a high speed switching operation, and supplies AC power of a predetermined frequency to the motor 230. And the motor 230 rotates by the AC power supply of a predetermined frequency.

Meanwhile, the driving unit 220 may correspond to the motor driving device 220 of FIG. 1.

On the other hand, the inverter controller 210, based on the output current (i _o ) flowing through the motor 230, can detect the amount of quantity. For example, while the washing tub 122 rotates, the amount of quantity can be sensed based on the current value i _o of the motor 230.

In particular, the inverter controller 210, when detecting the amount of capacity, by using the stator resistance and inductance value of the motor measured in the motor alignment section, it is possible to accurately detect the amount of quantity.

Meanwhile, the inverter controller 210 may detect an eccentric amount of the washing tub 122, that is, an unbalance (UB) of the washing tub 122. The eccentricity detection may be performed based on the ripple component of the output current i _o flowing through the motor 230 or the rotation speed change amount of the washing tub 122.

In particular, the inverter 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 section when detecting the quantity.

12 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.

As shown in FIG. 12, 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.

The indoor unit 31b of the air conditioner may be any of a stand type air conditioner, a wall-mounted air conditioner, and a ceiling type air conditioner, but the drawing illustrates the stand type indoor unit 31b.

Meanwhile, the air conditioner 100b may further include at least one of a ventilation device, an air cleaning device, 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 a refrigerant, an outdoor heat exchanger (not shown) for exchanging refrigerant and outdoor air, and an accumulator for extracting a gas refrigerant from the supplied refrigerant and supplying it to the compressor (not shown). And a four-way valve (not shown) for selecting a flow path of the refrigerant according to the heating operation. In addition, although a plurality of sensors, valves and oil recovery device, etc. are further included, the description of the configuration will be omitted below.

The outdoor unit 21b operates the compressor and the outdoor heat exchanger, and compresses or heat exchanges the refrigerant according to a setting to supply the refrigerant to the indoor unit 31b. The outdoor unit 21b may be driven by the demand of the remote controller (not shown) or the indoor unit 31b. In this case, as the cooling / heating capacity is changed corresponding to the indoor unit being driven, the number of operation of the outdoor unit and the number of operation of the compressor installed in the outdoor unit may be changed.

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

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

At this time, the outdoor unit 21b and the indoor unit 31b are connected by a communication line to transmit and receive data, and the outdoor unit and the indoor unit are connected to a remote controller (not shown) by wire or wirelessly and operate under the control of a remote controller (not shown). can do.

The remote controller (not shown) may be connected to the indoor unit 31b to input a user's control command to the indoor unit, and receive and display state information of the indoor unit. At this time, the remote control may communicate by wire or wirelessly according to the connection form with the indoor unit.

FIG. 13 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 12. FIG.

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

The outdoor unit 21b includes a compressor 102b that serves to compress the refrigerant, a compressor electric motor 102bb that drives the compressor, an outdoor side heat exchanger 104b that serves to radiate the compressed refrigerant, and an outdoor unit. An outdoor blower 105b disposed at one side of the heat exchanger 104b and including an outdoor fan 105ab for promoting heat dissipation of the refrigerant and an electric motor 105bb for rotating the outdoor fan 105ab, and an expansion for expanding the condensed refrigerant; The mechanism 106b, the cooling / heating switching valve 110b for changing the flow path of the compressed refrigerant, and the accumulator 103b for temporarily storing the gasified refrigerant to remove moisture and foreign matter and then supplying a refrigerant of a constant pressure to the compressor. And the like.

The indoor unit 31b is an indoor side heat exchanger 109b disposed indoors to perform a cooling / heating function, and an indoor fan 109ab and an indoor side disposed on one side of the indoor side heat exchanger 109b to promote heat dissipation of the refrigerant. The indoor blower 109b etc. which consist of the electric motor 109bb which rotates the fan 109ab are included.

At least one indoor side heat exchanger 109b may be installed. The compressor 102b may be at least one of an inverter compressor and a constant speed compressor.

In addition, the air conditioner 100b may be configured as a cooler for cooling the room, or may be configured as a heat pump for cooling or heating the room.

The compressor 102b in the outdoor unit 21b of FIG. 13 may be driven by a motor driving device, such as 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 device, as shown in FIG. 1, which drives the indoor fan motor 109bb and the outdoor fan motor 150bb, respectively.

14 is a perspective view illustrating a refrigerator that is another example of a home appliance according to an exemplary embodiment of the present invention.

Referring to the drawings, the refrigerator 100c according to the present invention, although not shown, has a case 110c having an inner space partitioned into a freezer compartment and a refrigerator compartment, a freezer compartment door 120c that shields the freezer compartment, and a refrigerator compartment. A rough appearance is formed by the refrigerating compartment door 140c.

In addition, the front surface of the freezing compartment door 120c and the refrigerating compartment door 140c is further provided with a door handle 121c protruding forward, so that the user easily grips and rotates the freezing compartment door 120c and the refrigerating compartment door 140c. Make it work.

On the other hand, the front of the refrigerator compartment door 140c may be further provided with a home bar 180c, which is a convenient means for allowing a user to take out a storage such as a beverage contained therein without opening the refrigerator compartment door 140c.

In addition, the front of the freezer compartment door 120c may be provided with a dispenser 160c, which is a convenience means for allowing the user to easily take out ice or drinking water without opening the freezer compartment door 120c, such a dispenser 160c. An upper side of the control panel 210c may be further provided to control the driving operation of the refrigerator 100c and to show a state of the refrigerator 100c being operated on the screen.

Meanwhile, although the dispenser 160c is illustrated as being disposed on the front surface of the freezer compartment door 120c, the present invention is not limited thereto, and the dispenser 160c may be disposed on the front side of the refrigerator compartment door 140c.

On the other hand, the inner upper portion of the freezer compartment (not shown) is an ice maker 190c for making water supplied using cold air in the freezer compartment, and an ice bank mounted inside the freezer compartment (not shown) so that the ice iced from the ice maker is iced and contained therein. 195c may be further provided. In addition, although not shown in the drawing, an ice chute (not shown) may be further provided to guide the ice contained in the ice bank 195c to fall into 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 temperature inside the refrigerator. For example, the display unit 230c may display a service type (eg, ice, water, or flake ice) of the dispenser, a set temperature of the freezer compartment, and a set temperature of the refrigerator compartment.

The display unit 230c may be implemented in various ways, such as a liquid crystal display (LCD), a light emitting diode (LED), and an organic light emitting diode (OLED). In addition, 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 may include a dispenser setting button (not shown) for setting a service type of the dispenser (ice cube, water, ice cubes, etc.) and a freezer compartment temperature setting button (not shown) for setting a freezer temperature. And, it may include 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 that can also perform the 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 drawings, but is a one door type, a sliding door type, a curtain door type. (Curtain Door Type) and other forms.

FIG. 15 is a view schematically illustrating a configuration of the refrigerator of FIG. 14.

Referring to the drawings, the refrigerator 100c is provided with a compressor 112c, a condenser 116c for condensing the refrigerant compressed by the compressor 112c, and a refrigerant condensed by the condenser 116c, and evaporated. 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 may be included.

On the other hand, in the drawing, but illustrated as using two evaporators, it is also possible to use each evaporator in the refrigerating chamber and the freezing chamber.

That is, the refrigerator 100c is a three-way valve for supplying a refrigerator evaporator (not shown) arranged in the refrigerator compartment (not shown) and a refrigerant condensed in the condenser 116c to the refrigerator compartment evaporator (not shown) or the freezer compartment evaporator 124c. (Not shown) and a refrigerator compartment expansion valve (not shown) for expanding the refrigerant supplied to the refrigerator compartment evaporator (not shown).

In addition, the refrigerator 100c may further include a gas-liquid separator (not shown) in which the refrigerant passing through the evaporator 124c is separated into a liquid and a gas.

In addition, the refrigerator 100c further includes a refrigerator compartment fan (not shown) and a freezer compartment 144c that suck cold air that has passed through the freezer compartment evaporator 124c and blow it into a refrigerator compartment (not shown) and a freezer compartment (not shown), respectively. can do.

In addition, the compressor driving unit 113c for driving the compressor 112c, a refrigerator compartment fan (not shown) and a refrigerator compartment fan driver (not shown) and a freezer compartment driver 145c for driving the freezer compartment 144c may be further included. have.

Meanwhile, according to the drawing, since a common evaporator 124c is used in the refrigerating compartment and the freezing compartment, in this case, a damper (not shown) may be installed between the refrigerating compartment and the freezing compartment, and the fan (not shown) may have two evaporators. The cold air generated in the air may be forced to be supplied to the freezing compartment and the refrigerating compartment.

The compressor 112c of FIG. 15 may be driven by a motor drive, such as FIG. 1, which drives the compressor motor.

Alternatively, the refrigerating compartment fan (not shown) or the freezer compartment fan 144c may be driven by a motor driving device, such as FIG. 1, respectively driving a refrigerating compartment fan motor (not shown) and a freezer compartment fan motor (not shown). .

The motor driving apparatus and the home appliance having the same according to the embodiment of the present invention are not limited to the configuration and method of the embodiments described as described above, but the embodiments may be modified in various ways. All or some of the embodiments may be optionally combined.

On the other hand, the motor driving method or the operation method of the home appliance of the present invention, the processor may be implemented as code that can be read by the processor on a recording medium that can be read by the processor provided in the motor drive device or home appliance. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims (9)

A dc stage capacitor storing a DC power supply;
And a first to third phase arm switching element and a first to third lower arm switching element, and by the switching operation, converts the DC power stored in the dc terminal capacitor into AC power, and converts the converted AC power into a motor. Output inverter;
A dc stage resistor disposed between the dc stage capacitor and the inverter;
An output current detector for detecting a current flowing through the dc stage resistance element;
And an inverter controller for controlling the inverter based on the detected current.
The inverter control unit,
According to a diagnostic mode, one of the first to third phase arm switching elements and one of the first to third lower arm switching elements are selected to control only two switching elements in the inverter to be turned on and detected. If the level of the current is outside the allowable range, some of the plurality of phase resistance of the motor is determined as a failure,
Only two switching elements in the inverter are controlled to be sequentially turned on,
A first period in which the first phase arm switching element and the second lower arm switching element are turned on, a second period in which the first phase arm switching element and the third lower arm switching element are turned on, and the second phase arm switching element And a third period in which the third lower arm switching element is turned on, a fourth period in which the second lower arm switching element is turned on, and a fourth period in which the first lower arm switching element is turned on, the third upper arm switching element, and the first lower arm In a fifth period in which the switching element is turned on, in the sixth period in which the third phase arm switching element and the second lower arm switching element are turned on,
The level of current detected in the third period and the sixth period is within the allowable range, and the level of the current detected in the first period, the second period, the fourth period, and the fifth period is the allowable. When out of range, it is determined that the first phase resistance corresponding to the first phase arm switching element among the plurality of phase resistances of the motor is a failure. The method of claim 1,
The inverter control unit,
And calculates a phase resistance of the motor based on the level of the detected current. delete The method of claim 1,
The inverter control unit,
And the motor is judged to be normal when the level of the detected current is within the allowable range during the first to sixth periods according to the diagnostic mode. The method of claim 1,
Further comprising: a temperature sensor for sensing a temperature around the motor,
The inverter control unit,
The lower the sensed temperature, the motor driving device, characterized in that for controlling so that the turn-on period in which only the two switching elements are turned on longer. The method of claim 1,
The inverter control unit,
And the diagnostic mode is controlled to be performed before a motor alignment period when the motor is driven. The method of claim 1,
The inverter control unit,
And controlling only two switching elements in the inverter to output a fixed duty switching control signal to the inverter to turn on. delete A home appliance comprising the motor driving device according to any one of claims 1, 2, and 4-7.

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