KR20170106744A - Fan motor driving apparatus and air conditioner including the same - Google Patents

Abstract

The present invention relates to a fan motor driving apparatus and an air conditioner including the same. According to an embodiment of the present invention, a fan motor driving apparatus comprises: a capacitor connected to a DC end; an inverter having a plurality of switching devices and driving a fan motor by converting DC power of the capacitor into AC power; a location detection portion for detecting a location of a rotor of a motor; and a control portion for outputting a switching control signal which is for converting the inverter based on the location detection signal obtained from the location detection portion. The control portion accelerates the motor up to a target speed to drive the motor. When the motor is accelerated, the acceleration is set to be smaller than a first acceleration which generates a hunting phenomenon when the target speed is reached, and is set to be greater than a second acceleration which generates restraining force against the motor. Accordingly, a possibility of restraining the fan motor can be reduced.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan motor driving apparatus and an air conditioner having the fan motor driving apparatus, and more particularly, to a fan motor driving apparatus and an air conditioner having the fan motor driving apparatus.

The air conditioner is installed to provide a comfortable indoor environment for humans by discharging cold air to the room to adjust the room temperature and purify the room air to create a pleasant indoor environment. Generally, the air conditioner includes an indoor unit which is constituted by a heat exchanger and installed in a room, and an outdoor unit which is constituted by a compressor, a heat exchanger and the like and supplies the refrigerant to the indoor unit.

On the other hand, among the causes of operation failure of the air conditioner, failure due to restraint of the fan motor is counted as a main cause. Accordingly, a method for reducing the possibility of confining the fan motor has been sought.

It is an object of the present invention to provide a fan motor driving apparatus capable of reducing the possibility of restraint of the fan motor and an air conditioner having the same.

According to an aspect of the present invention, there is provided a fan motor driving apparatus comprising: a capacitor connected to a dc stage; and a plurality of switching elements, wherein a DC power source from a capacitor is converted into an AC power source, And a control unit for outputting a switching control signal for controlling the inverter based on the position sensing signal from the position sensing unit, wherein the control unit controls the motor starting The acceleration at the time of motor acceleration is set to be larger than the first acceleration at which the hunting phenomenon at the time of reaching the target speed occurs and the second acceleration at which the constraint of the motor occurs.

According to another aspect of the present invention, there is provided a fan motor driving apparatus comprising: a capacitor connected to a dc stage; and a plurality of switching elements, wherein the DC power from the capacitor is converted into an AC power, And a control unit for outputting a switching control signal for controlling the inverter based on the position sensing signal from the position sensing unit, wherein the control unit includes: And if the position sensing signal is not sensed from the position sensing unit within a predetermined time during the acceleration of the motor, the motor is controlled so as to be restarted after stopping.

According to another aspect of the present invention, there is provided an air conditioner including a compressor for compressing refrigerant, a heat exchanger for performing heat exchange using compressed refrigerant, and a fan motor driving device for driving the compressor The fan motor driving apparatus includes a capacitor connected to a dc stage and an inverter for driving a fan motor by converting a DC power from a capacitor into an AC power and a plurality of switching elements, And a control unit for outputting a switching control signal for controlling the inverter based on the position sensing signal from the position sensing unit, wherein the control unit accelerates the motor to a target speed for starting the motor, The acceleration at the time of acceleration is smaller than the first acceleration at which the hunting phenomenon at the time of reaching the target speed occurs and the second acceleration at which the constraint of the motor occurs Set to.

According to another aspect of the present invention, there is provided an air conditioner including a compressor for compressing refrigerant, a heat exchanger for performing heat exchange using compressed refrigerant, and a fan motor driving device for driving the compressor A capacitor connected to the dc stage; an inverter having a plurality of switching elements, for converting the DC power from the capacitor to an AC power to drive the fan motor; And a control unit for outputting a switching control signal for controlling the inverter based on the position sensing signal from the position sensing unit, wherein the control unit receives the position sensing signal from the position sensing unit within a predetermined time during acceleration of the motor, Is not detected, the motor is controlled to be restarted after stopping.

A fan motor driving apparatus and an air conditioner having the fan motor driving apparatus according to an embodiment of the present invention include a capacitor connected to the dc stage and a plurality of switching elements, And a control unit for outputting a switching control signal for controlling the inverter on the basis of the position sensing signal from the position sensing unit, The motor is accelerated to the target speed and the acceleration at the time of the motor acceleration is set to be larger than the first acceleration at which the hunting phenomenon at the time of reaching the target speed occurs and the second acceleration at which the constraint of the motor is generated , The possibility of constraint of the fan motor can be reduced.

On the other hand, when the position sensing signal is not sensed from the position sensing unit within a predetermined time of the motor acceleration, restarting the motor after stopping the motor makes it possible to reduce the possibility of confining the fan motor.

On the other hand, when the number of times of stopping the motor is equal to or greater than the predetermined number of times, the fan motor restraint information is outputted, thereby making it possible to increase the usability of the user.

Meanwhile, the fan motor driving apparatus and the air conditioner having the fan motor driving apparatus according to another embodiment of the present invention include a capacitor connected to the dc stage, and a plurality of switching elements, and converts the DC power from the capacitor to an AC power And a control unit for outputting a switching control signal for controlling the inverter based on the position sensing signal from the position sensing unit, When the position sensing signal is not sensed from the position sensing unit within a predetermined time during the acceleration of the motor, the restraint possibility of the fan motor can be reduced by controlling the motor to restart after stopping the motor.

1 is a diagram illustrating a configuration of an air conditioner according to an embodiment of the present invention.
2 is a schematic view of the outdoor unit and the indoor unit of FIG.
Fig. 3 is an example of an internal block diagram of the outdoor unit of Fig. 1. Fig.
3 is a block diagram of a fan motor driving apparatus for fan driving in the outdoor unit of FIG.
4A is an internal block diagram of the inverter control unit of FIG.
4B is an internal block diagram of the converter control unit of FIG.
5A to 5C are views referred to explain the restraint of the fan motor.
6 is a flowchart illustrating an operation method of a fan motor driving apparatus according to an embodiment of the present invention.
Figs. 7A and 9B are views referred to the description of the operation method of Fig.

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

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

1 is a diagram illustrating a configuration of an air conditioner according to an embodiment of the present invention.

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

The indoor unit 31 of the air conditioner is applicable to any of the stand-type air conditioner, the wall-mounted air conditioner, and the ceiling type air conditioner, but the stand type indoor unit 31 is exemplified in the figure.

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

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

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

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

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

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

2 is a schematic view of the outdoor unit and the indoor unit of FIG.

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

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

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

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

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.

The fan 105a in the outdoor unit 21 in Fig. 2 can be driven by a fan motor driving apparatus (200 in Fig. 3) that drives the fan motor 105b.

3 is a block diagram of a fan motor driving apparatus for fan driving in the outdoor unit of FIG.

The fan 105a in the outdoor unit 21 in Fig. 2 can be driven by a fan motor driving apparatus (200 in Fig. 3) that drives the fan motor 105b.

The fan motor driving apparatus 200 for driving the fan includes an inverter 220 for outputting a three-phase AC current to the fan motor 250, an inverter control unit 230 for controlling the inverter 220, A converter 210 for supplying DC power, and a converter controller 215 for controlling the converter 210. [

The fan motor driving apparatus 200 receives the AC power from the system, converts the power, and supplies the converted power to the fan motor 250. Accordingly, the fan motor driving apparatus 200 may be referred to as a fan motor driving section.

The fan motor driving apparatus 200 according to an embodiment of the present invention includes a capacitor C connected to the dc stage and a plurality of switching elements and supplies the DC power from the capacitor C to the AC power source A position sensing unit 245 for sensing the position of the rotor of the motor 250 and a position sensing signal H from the position sensing unit 245. [ And an inverter control unit 230 for outputting a switching control signal for controlling the inverter 220 on the basis of the output signal of the inverter 250. The inverter control unit 230 controls the motor 250 to accelerate the motor 250 up to the target speed And the acceleration at the time of acceleration of the motor 250 is set to be larger than the first acceleration at which the hunting phenomenon at the time of reaching the target speed occurs and the second acceleration at which the constraint of the motor 250 occurs, It is possible to reduce the possibility of restraint.

If the position sensing signal H is not sensed from the position sensing unit 245 within a predetermined time during acceleration of the motor 250, the motor 250 is restarted after the motor 250 is stopped, thereby reducing the possibility of constraint of the fan motor 250 .

On the other hand, when the number of times of stopping the motor 250 is equal to or greater than the predetermined number of times, the fan motor restraint information is outputted, thereby making it possible to increase the usability of the user.

The fan motor driving apparatus 200 according to another embodiment of the present invention includes a capacitor C connected to the dc stage and a plurality of switching elements and supplies the DC power from the capacitor C to the AC power source A position sensing unit 245 for sensing the position of the rotor of the motor 250 and a position sensing signal H from the position sensing unit 245. [ And the inverter control unit 230 outputs the switching control signal for controlling the inverter 220 from the position sensing unit 245 within a predetermined time during acceleration of the motor 250 If the detection signal H is not sensed, it is possible to reduce the possibility of constraint of the fan motor 250 by controlling the motor 250 to stop and restart.

Meanwhile, the converter 210 that supplies the DC power to the inverter 220 may receive the input AC power and may convert the DC power.

To this end, the converter 210 may include a rectifier (not shown) and a boost converter (not shown). In addition, a reactor (not shown) may be further provided.

On the other hand, the converter 210 may include a rectifying section (not shown) and an interleave boost converter (not shown).

A capacitor C is connected to the dc terminal, which is the output terminal of the converter 210. The capacitor C may store the power output from the converter 210. [ Since the power source output from the converter 210 is a dc power source, it can be called a dc-stage capacitor.

The converter control unit 215 can control the converter 210 having the switching elements.

The inverter 220 includes a plurality of inverter switching elements and converts the smoothed direct current power supply Vdc into a three-phase alternating current power with variable frequency by the on / off operation of the switching element and outputs the three- .

More specifically, the inverter 220 may include a plurality of switching elements. For example, the upper arm switching elements Sa, Sb, Sc and the lower arm switching elements S'a, S'b, S'c are connected in series to each other and a total of three pairs of upper and lower arm switching elements Can be connected to each other in parallel (Sa & S'a, Sb & S'b, Sc & S'c). Diodes may be connected in anti-parallel to each switching element Sa, S'a, Sb, S'b, Sc, S'c.

The inverter control unit 230 can output the inverter switching control signal Sic to the inverter 220 in order to control the switching operation of the inverter 220. [

Inverter switching control signal (Sic) is a switching control signal of a pulse width modulation (PWM), may be generated on the basis of the motor 250, the output current (i _o) flowing through the output. The output current (i _o ) at this time can be detected from the output current detection section (E).

The dc short-circuit voltage detector B can detect the voltage Vdc stored in the dc short-circuit capacitor C. To this end, the dc voltage detection unit B may include a voltage trnasformer (VT) or a resistance element. The detected dc voltage (Vdc) is input to the inverter control unit 230.

An output current detector (E), the inverter can be detected 220 and the motor output current (i _o) flowing between (250). That is, the current flowing in the motor 250 can be detected.

The output current detection unit E can detect all of the output currents ia, ib, ic of each phase or can detect the output currents of two phases using the three-phase balance.

The output current detector E may be located between the inverter 220 and the motor 250. For current detection, a current transformer (CT), a shunt resistor, or the like may be used.

The position sensing unit 245 can sense the position of the rotor of the motor 250. For example, the position sensing unit 245 may include a Hall sensor, an encoder, and the like.

Meanwhile, the position sensing signal H sensed by the position sensing unit 245 may be input to the inverter control unit 230.

4A is an internal block diagram of the inverter control unit of FIG.

4A, the inverter control unit 230 includes an axis conversion unit 510, a position estimation unit 520, a current command generation unit 530, a voltage command generation unit 540, an axis conversion unit 550, And a switching control signal output unit 560.

The axial conversion unit 510 receives the three-phase output currents ia, ib, ic detected by the output current detection unit E and converts the three-phase output currents ia, ib, ic into a two-phase current iα, iβ in the stationary coordinate system.

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

)를 추정한다. 또한, 추정된 회전자 위치(

)에 기초하여, 연산된 속도(

)를 출력할 수 있다.The position estimating unit 520 estimates the position of the rotor 250 of the motor 250 based on the two-phase currents i? And i? Of the stationary coordinate system converted by the axis converting unit 510

). In addition, the estimated rotor position (

), The calculated speed (

Can be output.

On the other hand, the position estimating unit 520 can estimate the rotor position and speed of the motor 250 based on at least one of the output current io and the position sensing signal H. [

)와 목표 속도(ω)에 기초하여, 속도 지령치(ω^* _r)를 연산하며, 속도 지령치(ω^* _r)에 기초하여, 전류 지령치(i^* _q)를 생성한다. 예를 들어, 전류 지령 생성부(530)는, 연산 속도(

)와 목표 속도(ω)의 차이인 속도 지령치(ω^* _r)에 기초하여, PI 제어기(635)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 section 530 generates the current command

) Based on the speed command value ω ^* _r and the target speed ω and generates the current command value i ^* _q based on the speed command value ω ^* _r . For example, the current command generation unit 530 generates the current command

The PI controller 635 performs the PI control based on the speed command value? ^* _{R that} is the difference between the target speed? And the target speed?, And generates the current command value i ^* _q . In the figure, the q-axis current command value (i ^* _q ) is exemplified by the current command value, but it is also possible to generate the d-axis current command value (i ^* _d ) unlike the figure. On the other hand, the value of the d-axis current command value i ^* _d may be set to zero.

On the other hand, the current command generation unit 530 may further include a limiter (not shown) for limiting the current command value i ^* _q so that the current command value i ^* _q does not exceed the allowable range.

Next, the voltage command generation unit 540 generates the voltage command generation unit 540 based on the d-axis and q-axis currents (i _d , i _q ) axially transformed into the two-phase rotational coordinate system in the axial conversion unit and the current command value based on ^{_{i * d, i * q)}} , and generates a d-axis, q-axis voltage command value ^{_{(v * d, v * q}} ). For example, the voltage command generation unit 540 performs PI control in the PI controller 644 based on the difference between the q-axis current (i _q ) and the q-axis current command value (i ^* _q ) It is possible to generate the axial voltage command value v ^* _q . Further, voltage command generation unit 540, on the basis of the difference between the d-axis current (i _d) and, the d-axis current command value (i ^* _d), and performs the PI control in the PI controller (648), d-axis voltage It is possible to generate the command value v ^* _d . On the other hand, the value of the d-axis voltage command value v ^* _d may be set to zero corresponding to the case where the value of the d-axis current command value i ^* _d is set to zero.

The voltage command generator 540 may further include a limiter (not shown) for limiting the level of the d-axis and q-axis voltage command values v ^* _d and v ^* _q so as not to exceed the permissible range .

On the other hand, the generated d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) are input to the axial conversion unit 550.

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis transforming unit 550 transforms the position computed by the velocity computing unit 520

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

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

) Can be used.

Then, the axis converting unit 550 performs conversion from the two-phase stationary coordinate system to the three-phase stationary coordinate system. Through this conversion, the axial conversion unit 1050 outputs the three-phase output voltage instruction values v ^* a, v ^* b, v ^* c.

The switching control signal output unit 560 generates an inverter switching control signal Sic according to the pulse width modulation (PWM) method based on the three-phase output voltage set values v ^* a, v ^* b and v ^* c And output it.

The output inverter switching control signal Sic may be converted into a gate driving signal in a gate driver (not shown) and input to the gate of each switching element in the inverter 220. [ As a result, the switching elements Sa, S'a, Sb, S'b, Sc, and S'c in the inverter 220 perform the switching operation.

4B is an internal block diagram of the converter control unit of FIG.

The converter control unit 215 may include a current command generation unit 610, a voltage command generation unit 620, and a switching control signal output unit 630.

Current command generating unit 610, the output voltage detection unit (B), i.e. on the basis of the dc terminal voltage (Vdc) and a dc terminal voltage command value (V ^* dc) detected by the dc terminal voltage detector (B), PI controllers, etc. The q-axis current command value (i ^* _d , i ^* _q ) can be generated.

Voltage command generation section 620 d, q-axis current instruction value through the like ^{_{(i * d, i * q}} ) and the input current detected (i _L) by the PI control based on the d, q-axis voltage command value (v ^* _d , v ^* _q ).

Switching control signal output unit 630 is d, q-axis voltage command value (v ^* _d, v ^* _q) and a converter (210) a converter switching control signal (Scc) for driving the switching elements converter (210 in the base to As shown in Fig.

5A to 5C are views referred to explain the restraint of the fan motor.

First, FIG. 5A illustrates that the motor 250 rotates when the output current io1 flows through the motor 250 that is stopped.

Next, FIG. 5B illustrates that the motor 250 is stopped without rotating, even though the output current io1 flows in the motor 250 that is in the stop state. That is, it is illustrated that the motor 250 is constrained.

When the motor 250 is stopped, the motor 250 can be restrained by starting, dust, icing, or the like.

Alternatively, the motor 250 may be restrained by restraint of the fan. For example, when dust or the like is accumulated on the fan, the motor 250 can be restrained.

Next, FIG. 5C illustrates that the motor 250 is stopped without rotating, even though the output current io2 flows in the motor 250 being rotated. That is, it is illustrated that the motor 250 is constrained.

When the motor 250 rotates, the motor 250 is restrained when the reverse wind blows, the reverse rotation occurs, or dust or the like is input to the fan or the motor.

In the present invention, a method of preventing the fan motor 250 from being constrained in this manner is presented. This will be described with reference to FIG.

6 is a flowchart illustrating an operation method of a fan motor driving apparatus according to an embodiment of the present invention.

Referring to the drawing, the inverter control unit 230 can control the motor speed to increase in accordance with the motor start input (S610).

In other words, the inverter control unit 230 can control the motor 250 to accelerate to the target speed in accordance with the motor start input. The inverter 220 can output the switching control signal Sic in which the duty is sequentially increased so that the speed of the motor 250 is accelerated based on the sequentially increasing switching control signal Sic Can be controlled.

On the other hand, at the time of motor acceleration, the inverter control unit 230 accelerates the motor 250 to the target speed for starting the motor 250, and the acceleration at the time of the acceleration of the motor 250 is the hunting phenomenon at the time of reaching the target speed It is possible to reduce the possibility of restraint of the fan motor 250 by setting the second acceleration to be smaller than the first acceleration to be generated and the second acceleration to cause the constraint of the motor 250 to occur.

Next, the inverter control unit 230 may determine whether a position signal is sensed from the position sensing unit 245 within a predetermined time during acceleration of the motor (S620).

For example, the inverter control unit 230 determines whether the level of the input position sensing signal H is equal to or higher than the first level from the position sensing unit 245 within a predetermined time during the motor acceleration, , It can be determined that the position signal is not detected.

If it is determined in step 620 that a position signal is detected from the position sensing unit 245, the inverter control unit 230 may continue to control the motor 250 to accelerate to the target speed.

Then, the inverter control unit 230 can control to enter the normal operation mode after completion of the startup (S630).

If it is determined in step S620 that the position signal is not detected from the position sensing unit 245, the inverter control unit 230 may control the motor to stop and restart the motor (S640). Accordingly, the process can be performed again from step S610.

When the position sensing signal H is not sensed by the position sensing unit 245, the possibility of restraining the fan motor 250 can be reduced by controlling the motor 250 to stop after the motor 250 is stopped.

Figs. 7A and 9B are views referred to the description of the operation method of Fig.

First, FIG. 7A shows that the inverter control unit 230 controls the motor 250 to rotate at a target speed (V-1) based on the first speed command value V ^* 1 during the acceleration period To- (Vta), and a position sensing signal (H1) of a La level is input from the Ta time point of the acceleration period (To-Tb).

In this case, the inverter control unit 230 may determine that the constraint of the motor 250 does not occur, and may control the motor 250 to perform normal operation after accelerating the motor 250 to the target speed.

Next, FIG. 7B shows a state in which the inverter control unit 230 sets the motor 250 to the target speed (V-2) based on the second speed instruction value V ^* 2 during the acceleration period To- Vta) and the position detection signal H2 having no La level is input during the acceleration period To-Tb. That is, the case where the position sensing is not performed will be exemplified.

Next, FIG. 7C shows that the inverter control unit 230 accelerates the motor 250 based on the third speed command value V ^* 3 during the acceleration period Thr1 for starting the motor 250, Is not performed.

Accordingly, the inverter control unit 230 can control the motor 250 to stop during the stop period Toff1.

Thereafter, the inverter control unit 230 can restart the motor to control the motor to accelerate.

That is, as shown in the figure, the motor 250 is accelerated based on the third speed command value V ^* 3 during the acceleration period Thr2 for the motor 250 startup.

When the position sensing signal H3 of the La level is input during the acceleration period Thr2, the inverter control unit 230 determines that the constraint of the motor 250 does not occur, After acceleration to the speed, it is possible to perform control so that normal operation is performed.

7D shows a state in which the inverter control unit 230 accelerates the motor 250 during the acceleration period Tona, Tonb, Tonc, and Tond for starting the motor 250, Toffa, Toffb, Toffc, Toffd).

Thereafter, the inverter control unit 230 can restart the motor to control the motor to accelerate.

That is, as shown in the figure, acceleration of the motor 250 is illustrated based on the fourth speed command value V ^* 4 during the acceleration section for starting the motor 250. [

When the position sensing signal H4 of the La level is input at the time point Tx of the acceleration period Thr2, the inverter control unit 230 determines that the constraint of the motor 250 does not occur, ) To the target speed, and then controls the normal operation to be performed.

On the other hand, the inverter control unit 230 can control so that the stop period of the motor 250 is sequentially increased when the motor 250 is repeatedly accelerated and stopped.

That is, it is possible to control so that the motor stop intervals Toffa, Toffb, Toffc, and Toffd sequentially increase. As a result, the motor can be prevented from being locked.

Alternatively, when the acceleration and the stop of the motor 250 are repeated, the predetermined time, which is a reference at which the position sensing signal H is not sensed, may be sequentially decreased.

That is, when it is determined that the motor is already locked, the time at which the level of La is sensed can be controlled so as to be sequentially 5 seconds, 4 seconds, 3 seconds and 2 seconds from the acceleration time. This makes it possible to more quickly determine whether or not the motor is restrained.

On the other hand, the inverter control unit 230 can control to output the constraint information of the fan motor 250 when the number of times of stopping the motor 250 is a predetermined number or more.

8 illustrates that the indoor unit 31 outputs the fan error information 810 as a sound and the outdoor unit 820 outputs the fan error information 820 as a sound.

The fan error information 820 is outputted when the outdoor fan driving apparatus 200 is restrained, so that the user or the like can immediately recognize the fan error or the like.

On the other hand, when the outdoor fan is restrained by the outdoor fan driving apparatus 200, the indoor unit 31 outputs the fan error information 810 for the outdoor fan to the sound through internal communication (for example, power line communication) . Accordingly, a user in the room can easily grasp the outdoor fan error information.

FIG. 9A illustrates that the motor 250 is accelerated to the target speed Vta during the acceleration period Tm1 of the motor 250. FIG. At this time, the acceleration of the motor 250 may correspond to Rta.

FIG. 9A illustrates that the motor 250 is accelerated to the target speed Vta during the acceleration period Tm2 of the motor 250. FIG. At this time, the acceleration of the motor 250 corresponds to Rtb, which is larger than Rta, and hunting phenomenon may occur in which the rotational speed of the motor 250 pulsates after the target speed Vta by the fast acceleration.

9C shows a state in which the position sensing signal of the La level is detected during the acceleration period Tm1 of the motor 250 of FIG. 9A or the acceleration period Tm2 of the motor 250 of FIG. 9A Stable detection is exemplified.

The acceleration Rtb in FIG. 9A (b) can correspond to the acceleration in which the hunting phenomenon occurs in which the rotational speed of the motor 250 pulsates.

On the other hand, the acceleration Rta in Fig. 9A does not cause the rotational speed of the motor 250 to pulsate, but can correspond to the acceleration just before the constraint of the motor 250 occurs, as shown in Fig. 7B.

9B, in order to reduce the possibility of constraint of the fan motor 250, the inverter control unit 230 accelerates the motor 250 to the target speed when the motor 250 is started, The acceleration Rtc of the hour is preferably set to be larger than the first acceleration Rtb at which the hunting phenomenon at the time of reaching the target speed occurs and the second acceleration Rta at which the motor 250 is restricted . Accordingly, the hunting phenomenon in which the rotation speed of the restraining possibility fan motor 250 of the fan motor 250 is pulsated can be reduced.

The fan motor driving apparatus and the air conditioner having the fan motor driving apparatus according to the present invention are not limited to the configuration and method of the embodiments described above, All or some of them may be selectively combined.

Meanwhile, the fan motor driving apparatus or the air conditioner operating method of the present invention can be implemented as a code readable by a processor in a fan-motor driving apparatus or a processor-readable recording medium provided in the air conditioner. The processor-readable recording medium includes all kinds of recording apparatuses in which data that can be read by the processor is stored. Examples of the recording medium that can be read by the processor include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may also be implemented in the form of a carrier wave such as transmission over the Internet . In addition, the processor-readable recording medium may be distributed over network-connected computer systems so that code readable by the processor in a distributed fashion can be stored and executed.

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

Claims (10)

a capacitor connected to the dc stage;
An inverter having a plurality of switching elements, for converting a DC power from the capacitor to an AC power to drive the fan motor;
A position sensing unit for sensing a position of a rotor of the motor;
And a control unit for outputting a switching control signal for controlling the inverter based on the position sensing signal from the position sensing unit,
Wherein,
Wherein the motor accelerates the motor to a target speed for starting the motor and the acceleration at the time of the motor acceleration is smaller than the first acceleration at which the hunting phenomenon at the time of reaching the target speed occurs and the second acceleration Is set to be larger than a predetermined value. The method according to claim 1,
Wherein,
Wherein when the position sensing signal is not sensed from the position sensing unit within a predetermined time of the acceleration of the motor, the motor is restarted after stopping the motor. The method according to claim 1,
Wherein,
And when the motor speed reaches the target speed, control is performed so as to enter the normal operation mode. 3. The method of claim 2,
Wherein,
And outputs the fan motor constraint information when the number of times of stopping the motor is equal to or greater than a predetermined number. 3. The method of claim 2,
Wherein,
In the case of repeating acceleration and stop of the motor,
Wherein the control unit controls the motor so that the stop period of the motor is sequentially increased. 3. The method of claim 2,
Wherein,
In the case of repeating acceleration and stop of the motor,
Wherein the control unit controls the predetermined time to be sequentially decreased as a criterion that the position sensing signal is not sensed. The method according to claim 1,
Further comprising a converter for converting the input AC power to DC power and outputting the DC power converted to the dc stage. The method according to claim 1,
An output current detector for detecting an output current flowing to the motor;
Wherein,
An estimator for estimating a rotor position and a speed of the motor based on at least one of the output current or the position sensing signal;
A current command generator for generating a current command value based on the estimated speed and speed command value;
A voltage command generator for generating a voltage command value based on the current command value and the output current flowing to the motor;
And a switching control signal output unit for generating and outputting the switching control signal based on the voltage command value. a capacitor connected to the dc stage;
An inverter having a plurality of switching elements, for converting a DC power from the capacitor to an AC power to drive the fan motor;
A position sensing unit for sensing a position of a rotor of the motor;
And a control unit for outputting a switching control signal for controlling the inverter based on the position sensing signal from the position sensing unit,
Wherein,
Wherein when the position sensing signal is not sensed from the position sensing unit within a predetermined time of the acceleration of the motor, the motor is restarted after stopping the motor. A compressor for compressing the refrigerant;
A heat exchanger for performing heat exchange using the compressed refrigerant;
A fan disposed in the heat exchanger to blow air;
An air conditioner according to any one of claims 1 to 9, for driving the fan.

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