KR101716139B1 - Method for dirving outer fan motor of air conditioner and apparatus for driving the same - Google Patents

Abstract

The present invention relates to a method of driving an outdoor fan motor of an air conditioner and a driving apparatus therefor. A method of driving an outdoor fan motor of an air conditioner according to an embodiment of the present invention includes the steps of supplying a constant current so that the outdoor fan motor is aligned at a predetermined position, detecting an output current flowing through the outdoor fan motor, And varying the magnitude of the constant current supplied to the outdoor fan motor or the constant current supply period based on the output current. Thus, it is possible to stably drive the outdoor fan in spite of the draft.

Outdoor fan, electric motor, current

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an outdoor fan motor for an air conditioner,

The present invention relates to a method for driving an outdoor fan motor of an air conditioner, and more particularly, to a driving method of an outdoor fan motor of an air conditioner capable of stably driving an outdoor fan in spite of a wind, Driving device.

The air conditioner is disposed in a room such as a room, a living room, an office or a business store, and is capable of maintaining a comfortable indoor environment by controlling the temperature, humidity, cleanliness and airflow of the air.

The air conditioner is generally divided into an integral type and a separated type. The integral type and the separate type are the same as the functional type, but the integral type is formed by integrating the functions of cooling and heat dissipation to form a hole in the wall of the house or by hanging the device on the window. Side, an outdoor unit that performs heat dissipation and compression functions is installed, and the two devices separated from each other are connected by a refrigerant pipe.

On the other hand, in an air conditioner, a motor is used for a compressor, a fan, and the like, and a motor driving device for driving the motor is used.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of driving an outdoor fan motor of an air conditioner capable of stably driving an outdoor fan in spite of winds and a driving device thereof.

According to another aspect of the present invention, there is provided a method of driving an outdoor fan motor of an air conditioner, including the steps of: supplying a constant current so that the outdoor fan motor is aligned at a predetermined position; And varying the magnitude or constant current supply period of the constant current supplied to the outdoor fan motor based on the detected output current.

According to an aspect of the present invention, there is provided an outdoor fan motor drive apparatus for an air conditioner, including: an inverter for supplying a constant current so that the outdoor fan motor is aligned at a predetermined position; And a controller for controlling the inverter to vary the magnitude of the constant current supplied from the inverter to the outdoor fan motor or the constant current supply period based on the detected output current.

As described above, the driving method of the outdoor fan motor of the air conditioner according to the present invention and the driving apparatus thereof supply a constant current to align the outdoor fan at a predetermined position during the initial driving, It is possible to stably initialize the outdoor fan stably regardless of the draft, because the magnitude of the current supplied to the electric motor or the current supply period can be varied. That is, it can be aligned at a certain position despite the draft.

On the other hand, when the magnitude of the supplied current is equal to or greater than a predetermined value or when the current supply period is equal to or longer than the predetermined period, an error is displayed, whereby the stability of the drive apparatus can be improved.

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

1 is a schematic view of an air conditioner related to the present invention.

Referring to the drawings, an air conditioner 100 is roughly divided into an indoor unit 130 and an outdoor unit 150.

The indoor unit 130 includes an indoor heat exchanger 135 disposed in a room and performing a cooling / heating function, an indoor fan 140 disposed at one side of the indoor heat exchanger 135 for promoting heat radiation of the refrigerant, An indoor fan motor 145 for rotating the fan 140, and the like.

The outdoor unit 150 includes a compressor 160 that compresses the refrigerant, an electric motor 165 that drives the compressor, an outdoor heat exchanger 170 that dissipates the refrigerant compressed, An outdoor fan 175 disposed at one side of the side heat exchanger 180 for accelerating the heat radiation of the refrigerant and an outdoor fan motor 250 for rotating the outdoor fan 175 and an expansion mechanism 180 for expanding the condensed refrigerant, And an accumulator 190 for temporarily storing the gasified refrigerant to remove moisture and foreign substances and supplying a refrigerant of a predetermined pressure to the compressor, and the like do.

At least one indoor heat exchanger 135 may be installed. At least one of an inverter compressor and a constant speed compressor may be used as the compressor 170. [

Further, the air conditioner 100 may be constituted by a cooling unit that cools the room, or a heat pump that cools or heats the room.

Although the indoor unit 130 and the outdoor unit 150 are shown in FIG. 1, the outdoor fan motor driving apparatus of the air conditioner according to the embodiment of the present invention is not limited to this, and a plurality of indoor units and outdoor units The present invention is also applicable to an air conditioner having a multi-type air conditioner, a single indoor unit, and a plurality of outdoor units.

2 is a view schematically showing the interior of the outdoor unit of FIG.

The outdoor fan 175 and the outdoor fan motor 250 for driving the outdoor fan 175 are disposed in the outdoor unit 150 and the compressor 160 is disposed on the side of the outdoor fan 175 . The other components are not shown.

On the other hand, when the outside airflow 290 is blown to the outdoor unit 150 installed outdoors, the outdoor fan unit 175 may be rotated by the draft airflow 290. For example, as shown in the figure, when the adverse wind is blown, the outdoor fan 175 is immediately rotated.

In the embodiment of the present invention, the driving method of the outdoor fan motor and the operation of the outdoor fan motor for accurately driving the outdoor fan motor in spite of the draft are described. Particularly, the following description is based on a sensorless method in which there is no sensor for detecting the position of the outdoor fan motor.

3 is a circuit diagram showing an outdoor fan motor driving apparatus of an air conditioner according to an embodiment of the present invention.

3, the outdoor fan motor driving apparatus 200 according to the embodiment of the present invention includes a converter 210, a smoothing capacitor C, an inverter 220, a controller 230, And a current detection unit E. 3 may further include a reactor L, an input current detection unit A, a dc voltage detection unit B, and the like. The outdoor fan motor drive system 200 shown in Fig.

The reactor L may be disposed between the commercial AC power source 205 and the converter 210 to perform 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 210. [

The input current detection section A can detect the input current (i _s ) input from the commercial AC power source 205. For this, a current sensor, a current transformer (CT), a shunt resistor, or the like may be used. The detected input current (i _s ) may be input to the controller 230 as a discrete signal in the form of a pulse.

The converter 210 converts the commercial AC power source 205 that has passed through the reactor L into DC power and outputs the DC power. Although the commercial AC power source 205 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 210 also changes depending on the type of the commercial AC power source 205. For example, in the case of a single-phase AC power source, a half-bridge type converter in which two switching elements and four diodes are connected may be used, and in the case of a three-phase AC power source, six switching elements and six diodes may be used.

The converter 210 includes a switching element, and performs a boost operation, a power factor correction, and a DC power conversion by a switching operation. In the case where a switch element is provided, a switching control signal Scc may be supplied from the controller 230. Meanwhile, the converter 210 may be a diode or the like without a switching element, and may perform a rectifying operation without a separate switching operation.

The smoothing capacitor C is connected to the output terminal of the converter 210. The converted DC power outputted from the converter 210 is smoothed. Hereinafter, the output terminal of the converter 210 is referred to as a dc stage or a dc link stage. At the dc stage, a smoothed direct current voltage is applied to the inverter 220.

The dc voltage detection unit B can detect the dc voltage Vdc at both ends of the smoothing capacitor C. [ For this purpose, the dc voltage detection unit B may include a resistance element, an amplifier, and the like. The dc terminal voltage Vdc detected is a dc terminal voltage Vdc that is detected is a discrete signal in the form of a pulse and is used to estimate the input voltage v _s and to generate the converter switching control signal Scc And may be input to the control unit 230.

The inverter 220 has a plurality of inverter switching elements and converts the smoothed direct current power into a three-phase alternating current power having a predetermined frequency by on / off operation of the switching element and outputs the three-phase outdoor fan motor 250 to the three-

The inverter 220 includes a pair of upper arm switching elements Sa, Sb and Sc and lower arm switching elements S'a, S'b and S'c connected in series 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 220 perform ON / OFF operations of the respective switching elements based on the inverter switching control signal Sic from the controller 230. [ Thereby, the three-phase AC power source having the predetermined frequency is outputted to the three-phase outdoor fan motor 250.

In particular, in connection with an embodiment of the present invention, inverter 220 operates to supply a constant current to outdoor fan motor 250 during initial drive. For example, among the six switching elements, the upper arm switching element Sa and the lower arm switching elements S'b and S'c can be turned on. In particular, when PWM switching by the space vector is performed on / off operation of the switching element, switching by the space vector (1,0,0) can be performed. That is, the upper arm switching element Sa and the lower arm switching elements S'b and S'c can be turned on with a full duty within a unit switching frequency. Thereby, the rotor of the outdoor fan motor 250 is aligned at a predetermined position.

The output current detection unit E detects the output current flowing to the outdoor fan motor 250. The output current detection unit E can detect all the output currents of the respective phases or can detect the output currents of one or two phases using the three-phase balance.

The output current detection unit E is connected to at least one of the three ends of the three lower arm switching elements S'a, S'b, S'c in the inverter 220 as shown in the figure . The output current is detected through the shunt resistors Ra, Rb, and Rc.

The detected output current i ₀ can be applied to the control unit 230 as a discrete signal in a pulse form and is used to estimate the input current based on the detected output current i ₀ Can be used. In addition, the detected output current (i _o) is, may be used to generate the inverter switching control signal (Sic).

The control unit 230 controls the switching operation of the inverter 220. To this end, the control unit 230, receives the output current (i _o) detected by the output current detector (E), generates the inverter switching control signal (Sic), and outputs it to the inverter 220. The The inverter switching control signal Sic may be a switching control signal for pulse width modulation (PWM). The detailed operation of the output of the inverter switching control signal Sic in the controller 230 will be described later with reference to FIG.

On the other hand, the control unit 230 can also control the switching operation of the converter 210. [ The controller 230 may receive the dc terminal voltage Vdc detected by the dc terminal voltage detector B to generate a converter switching control signal Scc and output the converter switching control signal Scc to the converter 210. The converter switching control signal Scc may be a PWM switching control signal.

Meanwhile, the control unit 230 controls the outdoor fan motor 250 to be aligned at a predetermined position in the initial driving according to the embodiment of the present invention. That is, the inverter 220 controls the constant current to be supplied. The inverter switching control signal based on the space vector (1,0,0) can be output as described above.

Here, it the time of initial driving, that is, in the case of supplying a constant current (i _c) to the outdoor fan motor 250 at the inverter 220.

The controller 230 controls the constant current i _c supplied from the inverter 220 to the outdoor fan motor 250 based on the output current i _o flowing through the outdoor fan motor 250 at the time of initial driving, Or the current supply period can be varied.

This is because, by varying the magnitude of the constant current supplied to the outdoor fan motor 250 or the current supply period in accordance with the output current (I _o ) waveform affected by the draft, the outdoor fan motor can be stably So that it can be initialized.

Further, the control unit 230, an initial driving period of time of initial driving, the magnitude of the output current (i _o) flowing through the outdoor fan motor 250 exceeds the predetermined value or higher, or comprises a constant current (i _sc) supply period Is exceeded for a predetermined period or longer, an error is displayed.

The operation of the control unit 230 at the time of the initial drive described above will be described later with reference to Fig. 5 and the following figures.

The three-phase outdoor fan motor 250 is provided with a stator and a rotor, and alternating current power of a predetermined frequency is applied to a coil of each stator, so that the rotor rotates. As the type of the electric motor 250, various types such as a BLDC (blushless DC) electric motor and synRM (Synchronous Reluctance Motor) can be used.

Meanwhile, the control unit 230 may be an outdoor unit control unit, and may further perform communication with an indoor unit control unit that can be separately arranged in the indoor unit. The outdoor unit control unit receives the operation command by communication with the indoor unit control unit, and can determine a speed command value to be described later based on the received operation command.

The control unit 230 of the outdoor fan outdoor fan motor drive apparatus 200 of the air conditioner described above can control the outdoor fan motor 250 and the compressor motor simultaneously.

3, the outdoor fan motor driving apparatus according to the embodiment of the present invention can be applied to a direct current power source rather than a commercial AC power source. That is, the reactor L in front of the smoothing capacitor C and the converter 210 may not be provided. DC power can be supplied from a battery, a solar cell, or the like. It is also possible to further include a DC / DC converting unit for changing the level of the DC power supply.

4 is a simplified block diagram of the inside of the control unit of FIG.

The control unit 230 includes an estimation unit 305, a current command generation unit 310, a voltage command generation unit 320, and a switching control signal output unit 330.

On the other hand, the figure, although not shown, it is also possible to convert the three-phase output current (i _o) to the d-axis, q-axis current, or further comprising an axis conversion for converting the d-axis, q-axis current to the three-phase current.

The estimating unit 305 estimates the velocity v of the outdoor fan motor 250 based on the detected output current i _o . For example, the mechanical and electrical equations of the outdoor fan motor 250 can be compared with each other, and the velocity v of the outdoor fan motor 250 can be estimated accordingly.

The estimator 305 may also estimate the position of the rotor based on the detected output current _io . The location of such a simulator can estimate the electrical angle, or machine angle, of the outdoor fan motor 250. The relationship between the mechanical angle and the electrical angle is normally such that the period of the mechanical angle has a relationship of the number of poles of the electric motor 250 / twice as compared with the electrical angle.

Here, θ _Me represents the mechanical angle, and θ _e represents the electrical angle. For example, it has the relationship in the case where the number of poles of the motor 250 is six poles, θ _Me = 3θ _e.

That is, when the number of poles of the electric motor 250 is six poles, three electrical angles? _E of 120 占 cycle are matched within 360 占 of the mechanical angle? _Me .

The current command generation section 310 generates the current command value i ^* _d , i ^* _q based on the estimated speed v and the speed command value v ^* . For example, the current command generation unit 310 performs PI control based on the difference between the estimated speed v and the speed command value v ^* to generate the current command value i ^* _d , i ^* _q . To this end, the current command generator 310 may include a PI controller (not shown). It is also possible to further include a limiter (not shown) for limiting the current command value (i ^* _d , i ^* _q ) so that the current command value does not exceed the allowable range.

The voltage command generation unit 320 generates the voltage command values v ^* _d and v ^* _q based on the detected output current i _o and the calculated current command values i ^* _d and i ^* _q . For example, the voltage command generation unit 320 performs PI control based on the difference between the detected output current i _o and the calculated current command value i ^* _d , i ^* _q to generate a voltage command value v ^* _d , v ^* _q ). To this end, the voltage command generation unit 320 may include a PI controller (not shown). It is also possible to further include a limiter (not shown) for limiting the level so that the voltage command values v ^* _d and v ^* _q do not exceed the permissible range.

The switching control signal output unit 330 generates an inverter switching control signal Sic as a PWM signal based on the voltage command values v ^* _d and v ^* _q and outputs the switching control signal Sic to the inverter 220. Accordingly, the switching elements Sa, S'a, Sb, S'b, Sc, and S'c in the inverter 220 perform on / off switching operations.

FIG. 5 is a flowchart illustrating a method of driving an outdoor fan motor of an air conditioner according to an embodiment of the present invention, and FIGS. 6 to 9 are views referred to explain the driving method of FIG.

Referring to FIG. 5, first, a constant current is supplied to the outdoor fan motor 250 (S510).

In order to align the rotor position of the outdoor fan motor in the initial operation, the inverter 220 supplies a constant current to the outdoor fan motor 250.

To this end, the control unit 230 can output an inverter switching control signal based on the space vector (1,0,0). Accordingly, the upper arm switching element Sa and the lower arm switching elements S'b and S'c in the inverter 220 can be turned on with full duty within a unit switching frequency. The inverter 220 thereby supplies a constant current to the outdoor fan motor 250.

Next, the output current flowing in the motor is detected (S520).

The output current detection unit E detects the output current (i ₀ ) flowing through the outdoor fan motor 250. 3, the output current detection unit E may include shunt resistors Ra, Rb, and Rc connected to the lower arm switching elements S'a, S'b, and S'c.

6 shows an example of the output current detection waveform. FIG. 6 illustrates 0.7 A as the magnitude of the output current (i _o ) when the constant current (i _c ) is supplied to the outdoor fan motor 250. Thus, it can be seen that the supply current i _c is approximately 0.7 A. 6 illustrates that the initial driving period T _A including the constant current raising period Tr and the constant current supplying period Tc is 3 seconds (3S). 6, various sizes and periods may be set.

Referring to FIG. 6, it can be seen that the output current i _o is substantially constant, even though the outside air sucked into the outdoor unit 150 is insignificant and the constant current i _c is supplied for initial driving. That is, it can be seen that the output current (i _o) frequency components is low or almost none of the waveform. Therefore, when the draft is insignificant, the magnitude of the constant current supplied to the outdoor fan motor 250 or the supply period of the constant current may be constant during the initial drive.

Next, the magnitude of the constant current or the constant current supply period is varied based on the detected output current (S530).

An output current detector (E) detects an output current (i _o) flowing through the outdoor fan motor 250. Control unit 230, according to the waveform of the output current (i _o) to be detected, at least one of a supply period of a size and a constant current of the constant current supplied to the outdoor fan motor 250 can be varied. For example, the greater the intensity of the wind, the greater the magnitude of the constant current supplied to the outdoor fan motor 250, or the longer the supply period of the constant current.

The control unit 230 determines at least one of the magnitude of the constant current supplied to the outdoor fan motor 250 and the supply period of the constant current in consideration of the frequency component of the waveform of the detected output current i _o , One can be varied. The more the external wind is, the higher the frequency component of the frequency component of the detected output current (i _o ) becomes, and the magnitude of the waveform of the output current (i _o ) also can be varied. Accordingly, the control unit 230 can set the constant current supplied to the outdoor fan motor 250 to be large or the supply period of the constant current to be long.

Figure 7 illustrates the output current is detected (i _o) of the waveform when the draft is 9.82m / s. As shown in the drawing, it can be seen that the frequency component appears with constant current rise period Tr not constant due to the draft. Thereafter, a certain frequency component appears even in the constant current supply period Tc, but it can be seen that it maintains a constant level to some extent.

6, the control unit 230 sets the supply current i _c to about 0.7 A and sets the supply current Ic to the initial drive period Tc including the constant current rise period Tr and the constant current supply period Tc T _A ) can be set to 3 seconds (3S).

Next, Figure 8 illustrates the output current is detected (i _o) of the waveform when the draft is 14.89m / s. As shown in the drawing, it can be seen that the constant current rise period Tr is not constant and the high frequency component appears due to the draft. It can be seen that the high frequency component appears even in the constant current supply period Tc thereafter. Accordingly, as shown in the figure, it can be determined that the initial operating failure is caused.

In this way, the control unit 230, the supply current of approximately 0.7A (i _c) and 30 seconds (3S) first initial driving period (T _A1), in addition, the supply current of approximately 0.7A (i _c), and 4 seconds The second initial drive period T _A2 of the first drive signal 4S can be additionally set. That is, as the draft increases, the period of supplying the constant current increases. Thus, the initial drive can be stabilized.

On the other hand, it is also possible to vary the magnitude of the supply current in addition to the variable of the constant current supply period shown in the figure. For example, in the case of FIG. 8, 1A can be supplied instead of 0.7A. Accordingly, the second initial driving period T _A2 may be omitted.

Next, Figure 9 illustrates the output current is detected (i _o) of the waveform when the draft is 19.59m / s. As shown in the drawing, it can be seen that the high frequency component appears considerably because the constant current rise period Tr within the first initial driving period T _A2 and the second initial driving period T _A2 is not constant due to the draft. It can be seen that the high frequency component appears considerably even after the constant current supply period Tc thereafter. Accordingly, as shown in the drawing, it can be determined that an initial operating failure occurs after the first initial driving period T _A2 and the second initial driving period T _A2 .

Accordingly, the control unit 230 controls the supply current i _c of approximately 0.7 A, the first initial drive period T _A1 of 3 seconds (3S), the supply current (i _c ) of approximately 0.7 A, A supply current i _C of about 0.7 A and a third initial drive period T _A3 of 5 seconds 5 S can be additionally set in addition to the second initial drive period T _{A1 of the} drive transistor 4S. That is, as the draft increases, the period of supplying the constant current increases. Thus, the initial drive can be stabilized.

On the other hand, the controller 230 may set the initial driving period for the draft as shown in Table 1 below.

Wind wind speed The initial driving period 0 to 10 m / s 3 sec 10.01 ~ 15 m / s 4 sec 15.01 to 20 m / s 5 sec

On the other hand, it is also possible to vary the magnitude of the supply current in addition to the variable of the constant current supply period shown in the figure. For example, in the case of FIG. 8, 1.5A may be set instead of 0.7A in the first initial driving period (T _A1 ). Accordingly, the second initial driving period T _A2 and the third initial driving period T _A3 may be omitted.

Next, it is determined whether the magnitude of the output current is equal to or greater than a predetermined value or whether a constant current supply period is equal to or greater than a predetermined period (S540). If the initial driving period including the constant current supply period is equal to or greater than the predetermined value, the error is displayed (S550).

The controller 230 controls the drive of the outdoor fan motor 250 in the initial drive period T ( _Tc ) in which the magnitude of the output current (i _o ) flowing to the outdoor fan motor 250 exceeds a predetermined value or includes a constant current _A is exceeded for a predetermined period or longer, an error is displayed.

For example, either the magnitude of the output current (i _o) more than 2A, the initial driving period (T _A) comprising a constant current (i _c) supply period, it is possible to display an error if more than 30 seconds.

The error indication may include lighting using an LED or the like, or outputting sound through a speaker or the like. As a result, the error situation can be immediately known.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1 is a schematic view of an air conditioner related to the present invention.

2 is a view schematically showing the interior of the outdoor unit of FIG.

3 is a circuit diagram showing an apparatus for driving an outdoor fan motor of an air conditioner according to an embodiment of the present invention.

4 is a simplified block diagram of the inside of the control unit of FIG.

5 is a flowchart illustrating a method of driving an outdoor fan motor of an air conditioner according to an embodiment of the present invention.

FIGS. 6 to 9 are views referred to explain the driving method of FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

210: converter 220: inverter

230: control unit 250: outdoor fan motor

Claims (11)

A method of driving an outdoor fan motor of an air conditioner by a sensorless method, Receiving an operation command by communication with the indoor unit control unit; Determining a speed command value based on the received operation command; Supplying a constant current so that the outdoor fan motor is aligned at a predetermined position during a constant current supply period in the initial driving period; Detecting an output current flowing to the outdoor fan motor during the constant current supply period; And Varying the magnitude of the constant current supplied to the outdoor fan motor or the constant current supply period based on the detected output current during the constant current supply period; And displaying an error if the detected output current is greater than or equal to a predetermined value during the constant current supply period or when the initial driving period including the constant current supply period has elapsed for a predetermined period or longer, The current supply period variability is determined by: A supply period of the constant current and the number of times thereof, The outdoor fan motor includes: A pair of upper and lower arm switching elements connected in series to each other, and three pairs of upper and lower arm switching elements are driven by an inverter connected in parallel with each other, In the output current detection, Through the shunt resistive elements respectively connected to the lower arm switching elements in the inverter, The variable step comprises: The larger the frequency component of the detected output current is, the greater the magnitude of the supplied constant current, or the longer the constant current supply period, Wherein during the constant current supply period, the three pairs of upper and lower arm switching elements in the inverter perform a switching operation based on a switching control signal by a space vector (1, 0, 0) Of the outdoor fan motor. delete delete delete As an outdoor fan motor drive apparatus of an air conditioner by a sensorless method, An inverter for supplying a constant current so that the outdoor fan motor is aligned at a predetermined position during a constant current supply period during an initial driving period; An output current detector for detecting an output current flowing through the outdoor fan motor during the constant current supply period; And And a controller for controlling a magnitude of a constant current supplied from the inverter to the outdoor fan motor or a constant current supply period based on the detected output current during the constant current supply period, Wherein, Wherein the control unit receives the operation command by communication with the indoor unit control unit, determines the speed command value based on the received operation command, and when the current supply period varies during the constant current supply period during the initial driving period, Controlling the inverter to vary at least one of a supply period and a number of times thereof, An error is displayed when the magnitude of the detected output current is equal to or greater than a predetermined value during the constant current supply period or when the initial driving period including the constant current supply period elapses for a predetermined period or more, The inverter includes: And a lower arm switching element, wherein the upper arm switching element and the lower arm switching element are paired, and a total of three pairs of upper and lower arm switching elements are connected in parallel to each other, Wherein the output current detection unit comprises: And a shunt resistor element connected to the lower arm switching element in the inverter, The output current is detected through the shunt resistor element, Wherein, Controls the inverter such that a frequency component of the detected output current becomes larger, a magnitude of the supplied constant current becomes larger, or the constant current supply period becomes longer, Wherein during the constant current supply period, the three pairs of upper and lower arm switching elements in the inverter control to perform a switching operation based on a switching control signal by a space vector (1,0,0) An outdoor fan motor drive device of a harmonizer. delete delete delete 6. The method of claim 5, The inverter includes: Wherein the plurality of switching elements are provided to convert the direct current power to the constant current by the switching operation or to output the alternating current of the predetermined frequency and the predetermined magnitude. 10. The method of claim 9, And a converter for converting the commercial AC power to the DC power. 6. The method of claim 5, Wherein, Estimating a rotor position of the electric motor based on the detected output current, and estimating a speed of the electric motor based on the estimated rotor position; A current command generator for generating a current command value based on the estimated speed and the speed command value; A voltage command generator for generating a voltage command value based on the current command value and the detected output current; And And a switching control signal output unit for generating and outputting an inverter switching control signal based on the voltage command value.

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