JP4986672B2 - Oxygen concentrator and control method thereof - Google Patents

Description

  The present invention relates to an oxygen concentrator including an air compression unit that compresses air with a motor, and an inverter that drives and controls the motor, and a control method thereof.

As a method for reducing power consumption of an oxygen concentrator equipped with a conventional compressor, as disclosed in Patent Document 1, the difference between the set flow rate of the oxygen concentrator and the flow rate at the product tank outlet, or to the compressor By monitoring the load amount of the compressor and controlling the rotation speed of the compressor motor using an inverter, the supplied oxygen flow rate is kept constant, and the increase in the load current to the compressor motor is suppressed, resulting in efficient operation and consumption. The increase in power is prevented.
FIG. 3 is a block diagram of a conventional example disclosed in Patent Document 1. In FIG.
In this oxygen concentrator, reference numeral 1 denotes a compressor, and outside air is taken into an air intake through a dust filter 2 and a dehumidifier 3, and the taken-in air is pressurized to a constant pressure by the compressor 1 and sent to the oxygen concentrating unit 4. Is stored in the product tank 5.
When supplying oxygen-enriched air, the pressure is adjusted to a predetermined pressure through the pressure regulator 6, and the flow rate is adjusted through the flow rate setting device 7. Pressure detection ends 8a and 8b of the differential pressure sensor 8 are attached to the inlet side and the outlet side of the product tank 5, the detection value of the differential pressure sensor 8 is calculated by the flow rate calculation unit A, and the supplied flow rate and the set flow rate are compared with the comparison unit B. By comparing the difference between the above and the rotation speed control section C of the compressor control section 9 by using the inverter to control the rotation speed of the compressor 1, the oxygen flow to be supplied is maintained at the set flow rate, and efficient operation is achieved. Is also realized.
JP 2000-60973 (page 2-4, FIG. 1)

  In the conventional method for reducing power consumption disclosed in Patent Document 1, the number of rotations of the compressor motor is controlled by using an inverter based on the difference between the supplied oxygen flow rate and the set flow rate, thereby performing efficient operation. At this time, the compressor motor is a brushless DC motor having a magnetic pole position detector, and the inverter that controls the brushless DC motor controls the drive phase based on position information obtained from the magnetic pole position detection signal of the magnetic pole position detector. If the position information obtained from the magnetic pole position detection signal is away from the optimum phase due to the arrangement error of the magnetic pole position detector, a deviation between the drive phase to be controlled and the optimum drive phase occurs, resulting in the motor The reactive current at the time of driving increases, and there is a problem that even if the rotational speed control by the rotational speed controller C of the conventional method is performed, the operation is not efficient.

  The present invention has been made in view of such problems. The compressor motor is a brushless DC motor with a magnetic pole position detector, and position information obtained from a magnetic pole phase detection signal due to an arrangement error of the magnetic pole position detector or the like. An object of the present invention is to provide an oxygen concentrator provided with a section that performs an efficient operation of the compressor even when the phase is away from the optimum phase.

In order to solve the above problem, an oxygen concentrator invention according to claim 1 includes an air compression unit that compresses air by driving a motor , and a flow rate that controls opening and closing of a flow rate of compressed air sent from the air compression unit. an adjustment unit, and the flow rate adjuster oxygen concentrating unit that is sent compressed air flow rate is adjusted to concentrate the oxygen by the oxygen concentrator comprising an inverter, a driving controlling said motor, said inverter, said A drive phase adjustment unit is provided that adjusts the drive phase of the motor so that the integrated output current value of the inverter is minimized in each control cycle of the flow rate adjustment unit .
According to a second aspect of the present invention, in the oxygen concentrator according to the first aspect, the flow rate adjusting unit is a solenoid valve.
According to a third aspect of the present invention, in the oxygen concentrator according to the first aspect, the oxygen concentrating section includes a nitrogen adsorbent that selectively adsorbs nitrogen over oxygen.
According to a fourth aspect of the present invention, in the oxygen concentrator according to the first aspect, the driving phase adjustment unit changes the driving phase of the motor by a predetermined amount in a direction in which the integrated output current value decreases, and the integrated output current It is characterized in that drive phase adjustment processing is performed in which the drive phase before the value changes from decrease to increase is the optimum phase.

According to a fifth aspect of the present invention, in the oxygen concentrator according to the fourth aspect , after the drive phase adjustment unit has performed the drive phase adjustment process a predetermined number of times, an average value of optimum phases in each implementation is defined as a drive phase. It is characterized by doing.
According to a sixth aspect of the present invention, in the oxygen concentrator according to the fifth aspect , the drive phase adjustment process is performed when the motor is not being accelerated or decelerated.
According to a seventh aspect of the present invention, in the oxygen concentrator according to the fifth aspect , the drive phase adjustment processing is performed from the start of the air compression unit to the compression efficiency stabilization period of the air compression unit and the compression of the air compression unit. It is characterized by being carried out a predetermined number of times after the efficiency is stabilized.
According to an eighth aspect of the present invention, in the oxygen concentrator according to the first aspect, a chamber unit that stores oxygen concentrated in the oxygen concentrating unit, an oxygen monitoring unit that monitors oxygen in the chamber unit, and the oxygen monitoring unit And a controller that outputs a rotational speed command to the inverter. The oxygen monitor detects at least one of an oxygen flow rate, a gas temperature, and an oxygen concentration.
According to a ninth aspect of the present invention, in the oxygen concentrator according to the eighth aspect of the present invention, the oxygen concentrator includes a pressure sensor that detects a pressure of the oxygen concentrating unit, and an output of the pressure sensor is input to the control unit. .
The invention of an oxygen concentrator according to claim 10 includes an air compression unit that compresses air by driving a motor , a flow rate adjustment unit that controls opening and closing of a flow rate of compressed air sent from the air compression unit, and the flow rate adjustment An oxygen concentrator comprising: an oxygen concentrator that concentrates oxygen by sending compressed air whose flow rate is adjusted by the unit; and an inverter that drives and controls the motor, wherein the inverter starts from the start of the air compressor. The drive phase of the motor is set so that the integrated output current value of the inverter is minimized for each control cycle of the flow rate adjustment unit until the compression efficiency stabilization period of the air compression unit and after the compression efficiency of the air compression unit is stabilized. A drive phase adjustment unit for adjustment is provided.

The invention of the control method of the oxygen concentrator according to claim 11 includes an air compression step for compressing air by driving a motor , and a flow rate adjustment step for opening and closing a flow rate of the compressed air sent from the air compression step, In the method of controlling an oxygen concentrator, comprising: an oxygen concentration step in which compressed air whose flow rate is adjusted in the flow rate adjustment step is sent to concentrate oxygen; and a motor drive control step in which the motor is driven and controlled. The integrated output current value of the inverter is minimized between the start of the step and the compression efficiency stabilization period of the air compression step and after the compression efficiency stabilization of the air compression step for each control cycle of the flow rate adjustment step. A drive phase adjustment step for adjusting the drive phase of the motor is provided.
According to a twelfth aspect of the present invention, in the method for controlling an oxygen concentrator according to the eleventh aspect , the flow rate adjusting step is performed using a solenoid valve.
A thirteenth aspect of the invention is characterized in that, in the oxygen concentrator control method according to the eleventh aspect, an adsorbent that selectively adsorbs nitrogen rather than oxygen is used in the oxygen concentration step.
According to a fourteenth aspect of the present invention, in the method for controlling an oxygen concentrator according to the eleventh aspect , in the driving phase adjustment step, the driving phase of the motor is changed by a predetermined amount in a direction in which the integrated output current value decreases, The process is characterized in that the drive phase before the integrated output current value changes from decreasing to increasing is set as the optimum phase.
According to a fifteenth aspect of the present invention, in the method for controlling an oxygen concentrator according to the fourteenth aspect , in the driving phase adjustment step, after being executed a predetermined number of times, a process of setting an average value of optimum phases in each implementation as a driving phase. It is characterized by doing.
A sixteenth aspect of the present invention is the oxygen concentrator control method according to the fifteenth aspect , wherein the drive phase adjustment step is performed when the motor is not being accelerated or decelerated.

According to the first, third , fourth , fifth , eighth , and ninth aspects of the present invention, when there is an error in the magnetic pole position detection signal due to an arrangement error of the magnetic pole position detector of the motor, the reactive current due to the control drive phase shift of the inverter Can be suppressed.
According to the second aspect of the present invention, since the output current of the inverter is integrated based on the load fluctuation period of the compressor with motor, the drive phase adjustment processing is performed under the same conditions.
According to the sixth aspect of the present invention, since the drive phase adjustment process is performed at times other than during acceleration / deceleration, a more optimal drive phase adjustment process can be performed.
According to the seventh and tenth aspects of the present invention, the characteristics of the compressor change between the initial stage of operation and the period when the compression efficiency is stable, but optimal drive phase adjustment processing can be performed in each region.
According to the invention described in claims 11, 13, 14, and 15 , when there is an error in the magnetic pole position detection signal due to the arrangement error of the magnetic pole position detector of the motor, the reactive current caused by the control drive phase shift of the inverter 27 is reduced. The increase can be suppressed.
According to the twelfth aspect of the invention, since the output current of the inverter is integrated based on the load fluctuation period of the compressor 21 (motor 21a), the drive phase adjustment process is performed under the same conditions.
According to the sixteenth aspect of the present invention, although the characteristics of the compressor change in the initial operation and the compression efficiency stable period, optimum driving phase adjustment processing can be performed in each region.

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

FIG. 1 is a block diagram showing the configuration of the oxygen concentrator of the present invention.
In FIG. 1, 20 is an oxygen concentrator of the present invention, 21 is an air compressor (compressor), 21a is a brushless DC motor, 21b is a magnetic pole position detector, 22 is an oxygen concentrator (nitrogen adsorbent), and 23 is a flow rate. Adjustment unit (electromagnetic valve), 24 is a chamber unit, 25 is an oxygen monitoring unit, 26 is a control unit, 27 is an inverter unit, 27a is a rotation number detection unit, 27b is a rotation number control unit, and 27c is an inverter unit that amplifies PWM 27d is a current detection unit, 27e is an output current signal integration unit, 27f is a drive phase adjustment unit, 28 is an oxygen flow rate setting unit, and 29 is a pressure sensor.
The electromagnetic valve 23 is controlled to be opened and closed periodically (on / off at a predetermined control cycle) by the control unit 26. The control cycle is determined by the load fluctuation cycle of the compressor (motor 21a) that constitutes the air compressor 21.
The air compressor 21 takes in outside air and compresses it, and sends out pressurized air to the oxygen concentrator 22. The oxygen concentrating unit 22 raises the oxygen concentration of the pressurized air, sends the oxygen-enriched air to the chamber unit 24, and stores the concentrated oxygen in the chamber unit 24.
The control unit 26 refers to the setting from the oxygen flow rate setting unit 28, switches the electromagnetic valve constituting the flow rate adjustment unit 23, controls air compression / retraction to the oxygen concentrating unit 22, and is detected by the oxygen monitoring unit 25. The rotation of the motor (brushless DC motor) 21a constituting the compressor based on one or more measured values of the oxygen flow rate, the oxygen concentration and the gas temperature, and the pressure of the oxygen concentrating unit 22 detected by the pressure sensor 29. A number command is given to the rotation speed control unit 27 b in the inverter 27.
The inverter unit 27 controls the rotational speed of the brushless DC motor 21a (hereinafter referred to as “compressor motor 21a”) constituting the compressor 21 in response to the rotational speed command from the control unit 26. Further, during the rotation speed control of the brushless DC motor 21a, the drive phase to the compressor motor 21a is finely adjusted at the switching period to the electromagnetic valve 23 by the control unit 26, and the current detection unit 27d for each adjusted drive phase. The output current signal detected in step 1 is integrated by the output current signal integration unit 27e, and the current integration result for each adjusted drive phase is compared to adjust the drive phase that minimizes the output current to the compressor motor 21a. By doing so, high-efficiency operation of the compressor 21 is realized.

In order to carry out the present invention, the sequence for operating the compressor 21 is divided into an initial operation period and a stable compression efficiency period, the drive phase is changed at a period corresponding to each, and the operation is continued. The drive current phase is adjusted to the minimum by comparing the integrated values of the drive currents corresponding to the respective drive phase change periods. Adjustment is made with an average value of results obtained by performing this operation in each of the initial operation period and the compression efficiency stable period as an optimum value.
That is, as high-efficiency operation processing, (1) initial drive phase adjustment from the start of the compressor 21 to the compression efficiency stabilization period of the compressor 21 and (2) stable drive phase adjustment after the compressor 21 stabilizes the compression efficiency. This is realized by a two-stage process. The phase adjustment is performed in the initial stage of operation (1) and the compression efficiency stable period of (2) as described above, because the characteristics (current characteristics) of the compressor change in the initial stage of operation and the stable period of compression efficiency. is there.

FIG. 2 is a flowchart for carrying out the efficient operation of the oxygen concentrator 20 of the present invention.
The flag on the software is managed by setting the driving phase adjustment at the initial stage of operation as the initial driving adjustment mode and the driving phase adjustment at the compression efficiency stable period as the stable adjustment mode. Steps S19 to S22 to be described later are processes that are executed only when not in the initial operation adjustment mode, that is, in the stable operation adjustment mode.

In step S1, it is confirmed whether or not the drive phase adjustment has been completed. If the drive phase adjustment has been completed, the process is terminated without being executed, and if it has not been completed, the process proceeds to step S2.
Next, in step S2, the compressor stable operation waiting flag is confirmed. If it is not waiting for the compressor stability, the process proceeds to step S3, and if it is waiting for the compressor stability, the process proceeds to step S24.

<Steps S3 to S5: Steps for not adjusting while the motor is accelerating / decelerating>
Next, in step S3, it is confirmed whether the rotation speed of the compressor motor 21a has reached the rotation speed command from the control unit 26 (FIG. 1). If the rotation speed command is reached, the process proceeds to step S4.
Next, step S4 is a drive phase adjustment start step, and it is confirmed in the next step S5 whether or not the rotational speed command from the control unit 26 has been changed. If the rotational speed command is changed, the integrated value of the output current so far is cleared, and the process returns to step S3. If not changed, the process proceeds to step S6.
That is, steps S3 to S5 are determination steps for not performing adjustment while the motor 21a is accelerating / decelerating.

Next, in step S6, the output current value of the inverter 27 is integrated.
In step S7, it is confirmed whether the switching period of the solenoid valve 23 of the control unit 26 obtained in advance is reached. When the switching period of the solenoid valve 23 has elapsed, the process proceeds to step S8, where the output current integrated value in the current drive phase is compared with the previous time. Comparison with the output current integrated value at the drive phase is performed. The reason why the comparison is made with the switching period of the electromagnetic valve 23 is that this period coincides with the load fluctuation period of the compressor 21 (motor 21a).

<Steps S9 to S11: Each phase adjustment step when the inverter output current integrated value is larger and smaller than the previous value>
In step S9, if the current output current integrated value is large in the comparison result of the inverter output current integrated value, the process proceeds to step S10, and if the current current integrated value is small, the process proceeds to step S11.
In step S10, the process proceeds to step S12 in the step of switching the drive phase adjustment direction.
On the other hand, in step S11, a drive phase adjustment value is further added.
That is, in steps S9 to S11, when the inverter output current integrated value is larger than the previous value, the phase adjustment is excessive, so the adjustment is made to return to the original value (S10). Therefore, this is a step of further adjusting (S11).

  In step S12, it is confirmed whether the drive phase adjustment direction switching point is the previous drive phase adjustment direction switching point. If it is not the previous switching point, the process proceeds to step S14. In the case of the previous switching point, the process proceeds to step S13, and even if the current comparison in steps S15 and S19, which will be described later, does not satisfy the specified number of times, it is determined that the adjustment is optimal and the adjustment is considered to have been completed. This determination step reduces the time required for phase adjustment.

  Next, in step S14, it is confirmed whether the drive phase adjustment mode is in the initial stage of compressor operation. If the operation initial adjustment mode is selected, the process proceeds to step S15. If not, the process proceeds to step S19. In step S15, it is confirmed whether the output current comparison in the operation initial adjustment mode has been performed a specified number of times. If the specified number of times has been performed, the process proceeds to step S16, and if not, the process proceeds to step S23.

  In step S13, it is confirmed whether or not the operation initial adjustment mode is selected. If the operation initial adjustment mode is selected, the process proceeds to step S16. If the operation initial adjustment mode is not selected, the process proceeds to step S20.

In step S16, the average value calculation result of the drive phase switching points when the drive phase adjustment is performed is reflected in the drive phase adjustment value, and the process proceeds to step S17 as the completion of one drive phase adjustment. Next, in step S17, the number of times of initial operation adjustment is confirmed. If it is the specified number of initial operation adjustments, the process proceeds to step S18. If the predetermined number of initial operation adjustments is not satisfied, the process proceeds to step S23.
In step S18, the operation initial adjustment mode is completed, the compression efficiency stabilization waiting flag of the compressor 21 is set, and the process proceeds to step S23.
In step S23, the drive phase adjustment value adjusted so far is added to the position information obtained from the magnetic pole position detection signal.

<Steps S19 to S22: Processing executed only in the stable operation adjustment mode>
In step S19, it is confirmed whether the output current comparison specified number of times in the stable operation adjustment mode has been implemented. If the specified number of times has been implemented, the process proceeds to step S20, and if not, the process proceeds to step S23.
In step S20, the average value calculation result of the drive phase switching points when the drive phase adjustment is performed is stored in the drive phase adjustment value, the current drive phase adjustment is completed, and the process proceeds to step S21.
Next, in step S21, the number of times of stable operation adjustment execution is confirmed, and if it is the prescribed number of times of stable operation adjustment execution, the process proceeds to step S22, and if it is less than the prescribed number of times of stable operation adjustment execution, the process proceeds to step S23.
In step S22, a drive phase adjustment completion process is performed.

On the other hand, returning to the upper right of FIG. 2, in step S24, the compression efficiency stabilization waiting counter of the compressor 21 is counted up and the process proceeds to step S25.
In step S25, it is confirmed whether or not the compression efficiency stabilization waiting time of the compressor 21 has elapsed. If the waiting time has elapsed, the process proceeds to step S26, and if the waiting time has not elapsed, the process returns to step S1.
In step S26, the compressor 21 compression efficiency stabilization waiting mode and the initial operation adjustment mode flags are reset to enter the stable operation adjustment mode.

  Thereafter, in the operation of the compressor 21 provided in the oxygen concentrator 20, the purpose of adjusting the drive phase is to adjust the displacement of the magnetic pole position detector 21b mounted on the compressor motor 21a. Until it is determined that the combination with the inverter 27 mounted on the oxygen concentrator 20 is changed, the drive phase adjustment amount determined in the drive phase adjustment completion step S22 can be applied.

The differences between the present invention and Patent Document 1 are as follows.
In Patent Document 1, as a method of reducing the power consumption of an oxygen concentrator equipped with a compressor, the rotation speed of the compressor motor is set according to the comparison result of the set flow rate and the product tank flow rate or the load on the compressor. In the present invention, when the compressor motor is a brushless DC motor with a magnetic pole position detector, the drive phase of the compressor motor is set to the oxygen concentration cycle. In the part that reduces the power consumption of the oxygen concentrator by minimizing the output current to the compressor motor by sampling, integrating, and comparing the output current in each drive phase by changing in synchronization. is there.

  As described above, according to the present invention, since the displacement amount of the magnetic pole position detector of the brushless DC motor with the magnetic pole position detector can be adjusted, the compressor equipped with the brushless DC motor with the magnetic pole position detector such as the Hall IC. It can be applied to lower power consumption for the on-board device.

It is a block diagram showing the structure of the oxygen concentrator of this invention. It is a flowchart for implementing the efficient driving | operation of the oxygen concentrator of this invention. It is a block diagram showing the structure of the oxygen concentrator of a prior art example.

Explanation of symbols

21 Air compressor (compressor)
21a Brushless DC motor 21b Magnetic pole position detector 22 Oxygen concentrator (with nitrogen adsorbent)
23 Flow rate adjuster (solenoid valve)
24 chamber unit 25 oxygen monitoring unit 26 control unit 27 inverter 27a rotation speed detection unit 27b rotation speed control unit 27c inverter unit 27d current detection unit 27e current integration unit 27f drive phase adjustment unit 28 oxygen flow rate setting unit 29 pressure sensor S1 drive phase adjustment Completion confirmation step S2 Stability adjustment wait confirmation step S3 Speed arrival confirmation step S4 Drive phase adjustment start step S5 Command rotation speed change confirmation step S6 Detection current integration step S7 Solenoid valve switching cycle confirmation step S8 Integration current value comparison step S9 Integration current value Comparison result confirmation step S10 Driving phase adjustment direction switching step S11 Driving phase adjustment value addition step S12 Driving phase adjustment switching point confirmation step S13 Operation initial adjustment mode confirmation step S14 Operation initial adjustment mode confirmation step S15 Current comparison number confirmation Step S16 Drive phase adjustment result averaging step S17 Initial adjustment execution number confirmation step S18 Stability adjustment wait flag setting step S19 Current comparison number confirmation step S20 Drive phase adjustment result averaging step S21 Stability adjustment execution number confirmation step S22 Drive phase adjustment completion step S23 Drive adjustment phase addition step S24 Stability adjustment wait count step S25 Stability adjustment wait time confirmation step S26 Stability adjustment mode switching step

Claims (16)

An air compression unit that compresses air by driving a motor , a flow rate adjustment unit that controls opening and closing of a flow rate of compressed air sent from the air compression unit, and compressed air adjusted by the flow rate adjustment unit is sent. In an oxygen concentrator comprising an oxygen concentrating section for concentrating oxygen and an inverter for driving and controlling the motor,
The oxygen concentrator includes a drive phase adjustment unit that adjusts a drive phase of the motor so that an integrated output current value of the inverter becomes minimum for each control cycle of the flow rate adjustment unit . The oxygen concentrator according to claim 1, wherein the flow rate adjusting unit is a solenoid valve . The oxygen concentrator according to claim 1, wherein the oxygen concentrating unit includes a nitrogen adsorbent that selectively adsorbs nitrogen over oxygen. The drive phase adjustment unit changes the drive phase of the motor by a predetermined amount in a direction in which the integrated output current value decreases, and drives with the drive phase before the integrated output current value starts to increase from the decrease as an optimum phase. The oxygen concentrator according to claim 1, wherein phase adjustment processing is executed . 5. The oxygen concentrator according to claim 4, wherein the drive phase adjustment unit sets an average value of optimum phases in each implementation as a drive phase after the drive phase adjustment processing is performed a predetermined number of times . The oxygen concentrator according to claim 5, wherein the drive phase adjustment process is performed at a time other than during acceleration / deceleration of the motor . The driving phase adjustment process, after compression efficiency stability of the between and the air compression unit from the start of the air compressor unit to the compression efficiency plateau of the air compressor unit, according to claim 5, characterized in that the predetermined number of times performed The oxygen concentrator as described. A chamber for storing oxygen concentrated in the oxygen concentrating unit, an oxygen monitoring unit for monitoring oxygen in the chamber unit, and a control for outputting a rotation speed command to the inverter by inputting an output of the oxygen monitoring unit The oxygen concentrator according to claim 1 , wherein the oxygen monitoring unit detects at least one of an oxygen flow rate, a gas temperature, and an oxygen concentration. The oxygen concentrator according to claim 8 , further comprising a pressure sensor that detects a pressure of the oxygen concentrating unit, and an output of the pressure sensor is input to the control unit . An air compression unit that compresses air by driving a motor, a flow rate adjustment unit that controls opening and closing of a flow rate of compressed air sent from the air compression unit, and compressed air adjusted by the flow rate adjustment unit is sent. In an oxygen concentrator comprising an oxygen concentrating section for concentrating oxygen and an inverter for driving and controlling the motor,
The inverter is an integrated output current value of the inverter during a control period of the flow rate adjustment unit from the start of the air compression unit to the compression efficiency stabilization period of the air compression unit and after the compression efficiency of the air compression unit is stabilized. An oxygen concentrator comprising a drive phase adjustment unit that adjusts the drive phase of the motor so as to minimize gas. An air compression step for compressing air by driving a motor , a flow rate adjustment step for opening and closing a flow rate of compressed air sent from the air compression step, and compressed air adjusted in flow rate by the flow rate adjustment step In an oxygen concentrator control method comprising: an oxygen concentration step for concentrating oxygen; and a motor drive control step for driving and controlling the motor.
The integrated output current value of the inverter is minimized between the start of the air compression step and the compression efficiency stabilization period of the air compression step and after the compression efficiency stabilization of the air compression step and every control cycle of the flow rate adjustment step. A control method for an oxygen concentrator comprising a drive phase adjustment step for adjusting the drive phase of the motor as described above . 12. The method of controlling an oxygen concentrator according to claim 11, wherein the flow rate adjusting step is performed using a solenoid valve . 12. The method of controlling an oxygen concentrator according to claim 11, wherein an adsorbent that selectively adsorbs nitrogen rather than oxygen is used in the oxygen concentration step . In the drive phase adjustment step, a process of changing the drive phase of the motor by a predetermined amount in a direction in which the integrated output current value decreases, and setting the drive phase before the integrated output current value changes from decreasing to increasing as an optimal phase The method for controlling an oxygen concentrator according to claim 11, wherein: 15. The method of controlling an oxygen concentrator according to claim 14, wherein, in the drive phase adjustment step, after being executed a predetermined number of times, a process of setting an average value of optimum phases in each implementation as a drive phase is performed . 16. The method of controlling an oxygen concentrator according to claim 15, wherein the drive phase adjustment step is performed at a time other than during acceleration / deceleration of the motor .

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