WO2018042974A1

WO2018042974A1 - Pump device

Info

Publication number: WO2018042974A1
Application number: PCT/JP2017/027415
Authority: WO
Inventors: 滋辻; 東山　祐三; 寛昭和田
Original assignee: 株式会社村田製作所
Priority date: 2016-08-29
Filing date: 2017-07-28
Publication date: 2018-03-08
Also published as: JPWO2018042974A1; JP6687117B2

Abstract

The present invention provides a CPAP device which is used for positive airway pressure and which changes the pressure of a gas to be supplied at desired timing. The CPAP device has a fan and a control unit 30 for controlling rotation of the fan. A current command value estimation unit 34 of the control unit 30 outputs an estimated current command value Ie, which is an estimate, based on a rotation speed command Vm to a motor 23 which rotates the fan, of the actual current value of the motor 23. A current value comparison unit 35 outputs, as a current deviation D0, the difference between an actual current value Ir flowing through the motor 23 and the estimated current command value Ie. Differentiators 36, 37 obtain deviation differential values D1, D2 by differentiating the current deviation D0. A determination unit 38 outputs a corrected pressure value Pc on the basis of the current deviation D0 and the deviation differential values D1, D2. Then, the rotation speed of the fan is controlled in accordance with the rotation speed command Vm generated on the basis of a reference pressure command value P0 and the corrected pressure value Pc.

Description

Pump device

The present invention relates to a pump device used, for example, for positive airway pressure (PAP).

Conventionally, as a treatment for sleep-related disorders such as obstructive sleep apnea syndrome (OSA), for example, a continuous positive airway pressure (CPAP) device (hereinafter, CPAP device) is used (for example, CPAP device) Patent Document 1). This CPAP device has a pump device with a built-in fan, and feeds gas (for example, air) from a main body of the device to a mask mounted on a patient's face at a pressure higher than atmospheric pressure. This gas spreads the airway and suppresses throat blockage.

As the CPAP device, for example, there is a device that measures a gas flow rate by a flow sensor provided in a gas supply path and supplies a gas having a predetermined pressure. As another CPAP device, for example, there is a device that estimates a flow rate from a motor current of a motor driving a fan using a look-up table and supplies a gas having a predetermined pressure.

Special table 2008-518646 gazette

Incidentally, it is required to change the pressure of the gas supplied to the mask at a desired timing. For example, if gas is supplied at a constant pressure at all times, the patient may feel breathless because the gas at a constant pressure is supplied even when exhaling, that is, when exhaling. For this reason, it is calculated | required that the pressure of the gas supplied to the mask with which the patient was mounted | worn is reduced according to a patient's expiration timing. However, since the CPAP device as described above supplies gas at a desired pressure, there is a problem that the pressure cannot be changed at a timing according to the patient's condition.

The present invention has been made to solve the above-mentioned problems, and its object is to provide a pump device that is used for positive airway pressure and that enables the pressure of the gas supplied at a desired timing to be changed. There is to do.

A pump device that solves the above problem is a pump device that is used for positive airway pressure, and includes a fan, a drive unit that rotationally drives the fan, and a drive that controls driving of the fan via the drive unit. A control circuit; an inflow port through which fluid flows; a discharge port through which the fluid is discharged by rotational driving of the fan; a current command value estimating unit that estimates an estimated current command value from a rotational speed command of the fan; A current value measuring unit that measures an actual current value flowing through the unit, a current that compares the estimated current command value with the actual current value, and obtains a current deviation that is a deviation between the estimated current command value and the actual current value A value comparison unit, a differentiation unit that obtains a deviation differential value obtained by differentiating the current deviation, a rotation speed control unit that generates the rotation speed command based on the current deviation and the deviation differential value, and the rotation speed command Based on Having a drive unit for supplying a driving current to the driving unit.

According to this configuration, the current deviation of the difference between the estimated current command value estimated from the rotational speed of the fan supplying the fluid and the actual current flowing in the drive unit that drives the fan is obtained. Then, the rotational speed of the fan is controlled based on the current deviation and the deviation differential value obtained by differentiating the current deviation. Fluid is discharged at a pressure corresponding to the rotational speed of the fan. This makes it possible to control the rotational speed of the fan at a desired timing without using a sensor that measures the flow rate of the fluid or performing complicated control such as a look-up table. Can be planned. Further, by using the differential derivative value obtained by differentiating the current deviation, the determination timing is earlier than that when the current deviation is used, and the timing for controlling the rotation of the fan is earlier.

In the above pump device, it is preferable that the rotation speed control unit lowers the rotation speed command when the current deviation and the deviation differential value are smaller than the corresponding determination values.

According to this configuration, when the current deviation and the deviation differential value are smaller than the corresponding determination values, the rotational speed command is lowered. Here, the deviation differential value indicates a change in current deviation. Therefore, when the deviation differential value is used, the determination timing is earlier than when only the current deviation is used. For this reason, the number of rotations of the fan can be reduced at an early timing.

In the above pump device, the differentiating unit obtains a first deviation differential value obtained by differentiating the current deviation once and a second deviation differential value obtained by differentiating the current deviation twice, and the rotational speed control. The unit preferably generates the rotational speed command based on at least one of the first deviation differential value and the second deviation differential value and a current deviation.

According to this configuration, the flow rate can be controlled without using a sensor that measures the flow rate of the fluid or performing complicated control such as a lookup table. Further, by using the second deviation differential value obtained by differentiating the current deviation twice, the determination timing is earlier than in the case where the current deviation is used, and the timing for controlling the rotational speed of the fan is earlier.

In the above pump device, the rotation speed control unit is configured so that the rotation speed is determined when at least one of the first deviation differential value, the second deviation differential value, and the current deviation are smaller than corresponding determination values. It is preferable to reduce the command.

According to this configuration, when at least one of the first differential differential value and the second differential differential value and the current deviation are smaller than the corresponding determination values, the fan speed is reduced. Here, the deviation differential value indicates a change in current deviation. Therefore, compared with the case where only the current deviation is used, the timing in the determination when the first and second deviation differential values are used is earlier. For this reason, the number of rotations of the fan can be reduced at an early timing.

In the pump device, the rotation speed control unit obtains a correction command value based on the current deviation and the deviation differential value, and calculates a pressure command value based on a reference pressure command value and the correction command value. The rotation speed command is generated based on the pressure command value, and the current command value estimation unit estimates a torque command in the drive unit based on the rotation speed command, and the estimated current based on the torque command. It is preferable to estimate the command value.

According to this configuration, it is possible to estimate the torque command in the drive unit based on the rotational speed command to the drive unit, and easily estimate the estimated current command value in the drive unit based on the torque command. Then, by acquiring the correction command value based on the result of comparing the estimated current command value and the actual current value, it is possible to change the rotation speed command to the drive unit, that is, the fan rotation speed.

In the above pump device, it is preferable that the determination value to be compared with the current deviation and the deviation differential value is set according to the expiration state.
According to this configuration, in the pump device used for positive airway pressure, it is possible to control the rotation of the fan at a timing according to expiration, for example, to reduce the flow rate of the fluid to be discharged.

According to the pump device of the present invention, in the pump device used for positive airway pressure, it is possible to change the pressure of the gas supplied at a desired timing.

(A) is a sectional side view of the CPAP device, (b) is a plan sectional view of the CPAP device. Schematic which shows the use condition of a CPAP apparatus. The block diagram which shows the electrical constitution of a CPAP apparatus. The block diagram which shows schematic structure of a control part. The flowchart for determining an expiration state. The wave form diagram which shows the operation state of a CPAP apparatus. The wave form diagram which shows the operation state of a CPAP apparatus.

Hereinafter, an embodiment will be described.
In the accompanying drawings, components may be shown in an enlarged manner for easy understanding. The dimensional ratios of the components may be different from the actual ones or in other drawings. Further, in the cross-sectional view, some components may not be hatched for easy understanding.

As shown in FIG. 2, a continuous positive airway pressure (CPAP) device (simply CPAP device) 10 as a pump device is connected to a mask 62 via a tube 61. The mask 62 is attached to the face of the patient 63. The CPAP device 10 supplies a gas (for example, air) having a desired pressure to the patient 63 through the tube 61 and the mask 62. The CPAP device 10 estimates the state of the patient 63 (for example, during expiration) and controls the pressure of the gas supplied to the patient 63 at the estimated timing.

The CPAP device 10 includes a housing 11, a display unit 12 and an operation unit 13 disposed on the upper surface of the housing 11. The CPAP device 10 displays various types of information including setting values on the display unit 12. Further, the CPAP device 10 sets various information including setting values based on the operation of the operation unit 13. The set value includes the pressure value of the gas to be supplied and the flow rate value of the gas. The set value includes the pressure value of the gas supplied during expiration.

The CPAP device 10 estimates the expiration timing of the patient 63 wearing the mask 62. Then, the pressure value of the gas to be supplied is controlled at the estimated expiration timing. For example, the CPAP device 10 supplies gas at a standard pressure value. The standard pressure value is a pressure value designated by a doctor, for example, and is 1000 [Pa], for example. Then, the CPAP device 10 changes the pressure of the gas to be supplied to the exhalation pressure value at the estimated expiration timing. The exhalation pressure value is 700 [Pa], for example. That is, the CPAP device 10 alternately controls the pressure of the gas supplied according to the state of the patient 63 (exhalation, inspiration) to the standard pressure value and the exhalation pressure value.

As shown in FIG. 1A and FIG. 1B, the CPAP device 10 includes a housing 11, and a fan unit 20 and a control unit 30 provided in the housing 11. The housing 11 has a suction port 14 for sucking gas and a discharge port 15 for discharging the sucked gas. A tube 61 shown in FIG. 2 is connected to the discharge port 15. The interior of the housing 11 has a blower chamber 17 and a control chamber 18 that are partitioned by a standing partition wall 16.

As shown in FIG. 1B, a fan unit 20 is disposed in the blower chamber 17. The fan unit 20 includes a fan case 21, a fan 22 accommodated in the fan case 21, and a motor 23 (denoted as “M” in the drawing) as a drive source for driving the fan 22.

The fan case 21 has a suction port 21a that opens downward and a discharge port 21b that projects to the side. The discharge port 21 b of the fan case 21 communicates with the discharge port 15 of the housing 11. The motor 23 is attached to the upper surface of the fan case 21, and the rotating shaft 23 a of the motor 23 is inserted into the fan case 21. The fan 22 is attached to the rotating shaft 23 a of the motor 23.

The fan 22 is, for example, a centrifugal fan. When the fan 22 is rotationally driven by the motor 23, gas is taken into the blower chamber 17 from the suction port 14 as indicated by an arrow in FIG. Further, as indicated by the arrows, the gas is sucked into the fan case 21 from the blower chamber 17 through the suction port 21a. And the gas inside the fan case 21 is discharged from the discharge port 21b. The discharged gas is sent from the discharge port 15 of the housing 11 to the patient 63 via the tube 61 and the mask 62 shown in FIG.

A control unit 30 is disposed in the control room 18. The control unit 30 includes, for example, a circuit board and a plurality of electronic components mounted on the circuit board. The control unit 30 rotationally drives the fan 22 based on detection results from various sensors described later. Further, the control unit 30 estimates the state of the patient 63 (for example, exhalation timing) based on detection results from various sensors. Then, the control unit 30 controls the pressure of the gas discharged from the discharge port 21b based on the estimated state of the patient 63.

FIG. 3 shows the electrical configuration of the CPAP device 10.
As shown in FIG. 3, the CPAP device 10 includes a display unit 12, an operation unit 13, a motor 23, a control unit 30, a pressure sensor 41, and a current sensor 42 as a current value measurement unit.

The pressure sensor 41 is provided in the fan case 21 shown in FIG. 1A, detects the pressure inside the fan case 21, and outputs a pressure detection signal. The current sensor 42 detects a drive current supplied to the motor 23 and outputs a current detection signal corresponding to the drive current.

Various setting values are stored in the control unit 30. The set value includes a standard pressure value, a pressure value during expiration, and a determination value.
The control unit 30 determines the rotation speed of the motor 23 based on the pressure detection signal of the pressure sensor 41, the actual current value Ir detected by the current sensor 42, and various set values. The gas is discharged from the CPAP device 10 by the rotation of the motor 23. That is, the control unit 30 controls the pressure of the gas discharged from the CPAP device 10 based on the deviation (difference value) between the pressure command value and the actual pressure value.

FIG. 4 is a partial block circuit diagram of the control unit 30 and shows a control block related to driving of the motor 23.
The control unit 30 includes

adders

31 and 32, a controller 33, a current command value estimation unit 34, a current value comparison unit 35, a differentiator 36, a second differentiator 37, a determination unit 38, and a drive unit 39 ("D" in the figure). ).

The adder 31 is supplied with a reference pressure command value P0 as a command value (set value). The adder 31 is supplied with a correction command value Pc corresponding to the determination result of the determination unit 38. The adder 31 adds a negative correction command value Pc to the reference pressure command value P0, that is, calculates a deviation (difference value) between the reference pressure command value P0 and the correction command value Pc, and uses the calculation result as the pressure command. The value P1 is output to the adder 32.

The pressure detection value Pr detected by the pressure sensor 41 shown in FIG. The adder 32 adds a negative pressure detection value Pr to the pressure command value P1, that is, calculates a deviation (difference value) between the pressure command value P1 and the pressure detection value Pr, and calculates the calculation result as a pressure deviation value P2. To the controller 33.

The controller 33 outputs a rotational speed command Vm corresponding to the pressure deviation value P2 to the drive unit 39. The rotational speed command Vm is a rotational speed command for driving the motor 23 and is a rotational speed command for the fan 22 that is rotationally driven by the motor 23. The drive unit 39 supplies a drive current corresponding to the rotational speed command Vm to the motor 23. The motor 23 rotates according to the supplied drive current. Therefore, the motor 23 rotates at the rotation speed corresponding to the pressure deviation value P2 by the rotation speed command Vm. The rotation speed command Vm is supplied to the current command value estimation unit 34.

The current command value estimation unit 34 estimates the estimated current command value Ie in the motor 23 based on the rotation speed command Vm. In the current command value estimation unit 34, a value of torque generated in the motor 23 with respect to the rotation speed command Vm (for example, a table or a calculation formula) is set. The current command value estimation unit 34 is set with a torque constant unique to the motor 23. The current command value estimation unit 34 estimates a torque command for the rotation speed command Vm. Then, the current command value estimation unit 34 estimates the estimated current command value Ie in the motor 23 based on the estimated torque command and the torque constant.

The estimated current command value Ie is supplied to the current value comparison unit 35. The current value comparing unit 35 is supplied with the actual current value Ir detected by the current sensor 42 shown in FIG. The actual current value Ir indicates an actual current value (actual current value) in the motor 23. The current value comparison unit 35 calculates a deviation (difference value) between the estimated current command value Ie and the actual current value Ir, and outputs the calculation result as a current deviation D0. The current deviation D0 is supplied to the determination unit 38, the differentiator 36, and the twice differentiator 37.

The differentiator 36 outputs the result obtained by differentiating the current deviation D0 once to the determination unit 38 as the first deviation differential value D1. The twice differentiator 37 outputs the result obtained by differentiating the current deviation D0 twice to the determination unit 38 as the second deviation differential value D2.

The determination value is stored in the determination unit 38. The determination value includes a determination value corresponding to the current deviation D0, a first differential determination value corresponding to the first deviation differential value D1, and a second differential determination value corresponding to the second deviation differential value D2. The determination unit 38 compares the current deviation D0, the first deviation differential value D1, the second deviation differential value D2, and the determination value, the first differential determination value, and the second differential determination value, respectively, and based on the comparison result It is determined whether or not it is the expiration timing. The determination value and the first and second differential determination values are set and stored in advance based on experiments and simulations. As an example, the determination value is “−0.005”, the first differential determination value is “−4”, and the second differential determination value is “0”.

Then, the determination unit 38 outputs a correction command value Pc corresponding to the determination result.
FIG. 5 is a flowchart for determining the expiration state. The determination unit 38 compares the current deviation D0 with the determination value, step S1, compares the first deviation differential value D1 with the first differential determination value, and compares the second deviation differential value D2 with the second differential determination. Step S3 for comparing the value is executed to determine whether or not the patient is in the expired state. The execution order of steps S1 to S3 can be arbitrarily changed. For example, steps S1 to S3 may be executed simultaneously. In the illustrated example, the determination unit 38 determines that the current deviation D0 is smaller than the determination value (YES in S1), the first deviation differential value D1 is smaller than the first differential determination value (YES in S2), and the second When the deviation differential value D2 is smaller than the second differential determination value (YES in S3), it is determined as an expired state. When the determination unit 38 determines NO in one or more of steps S1 to S3, the determination unit 38 determines that it is not in the expired state. The determination unit 38 determines when the current deviation D0, the first deviation differential value D1, and the second deviation differential value D2 are smaller than the corresponding determination value and the first and second differential determination values. And The determination unit 38 outputs the first correction value as the correction command value Pc when it is determined as the expiration state, and outputs the second correction value as the correction command value Pc when it is determined that the state is not the expiration state. The first correction value is set to set the discharge pressure of the CPAP device 10 as the exhalation pressure value, and is set to, for example, “50 Pa”. The second correction value is set so that the discharge pressure of the CPAP device 10 is a standard command value, and is set to “0”, for example.

The correction command value Pc is supplied to the adder 31 described above. The adder 31 adds a negative correction command value Pc to the standard command value, that is, subtracts the correction command value Pc from the standard command value. That is, when it is determined that the patient is in the expired state, the pressure command value P1 that is reduced from the standard command value is generated based on the correction command value Pc. The motor 23 is driven so as to satisfy the pressure command value P1.

Next, the operation of the CPAP device 10 will be described.
The control unit 30 of the CPAP device 10 obtains an estimated current command value Ie obtained by estimating the current value flowing through the fan 22 from the rotation speed command Vm for the motor 23 that rotationally drives the fan 22. The actual current value Ir of the fan 22 is obtained by the current sensor 42. The current (actual current value Ir) flowing through the motor 23 varies depending on the respiratory state of the patient 63 to which the mask 62 is attached. The respiratory state in the patient 63 appears as a change in load on the motor 23. For example, when the patient 63 is in an inhalation state, the load on the motor 23 is small, and when the patient 63 is in an exhalation state, the load on the motor 23 is large.

FIG. 6 shows the estimated current command value Ie and the actual current value Ir in the motor 23. In FIG. 6, the horizontal axis represents time, and the vertical axis represents the current value. Note that the waveforms shown in FIG. 6 indicate the estimated current command value Ie and the actual current value Ir when artificially repeating exhalation and exhaustion. Further, the waveform is offset to show the difference between the estimated current command value Ie and the actual current value Ir, and the estimated current command value Ie is shown as the center. As shown in FIG. 6, the respiratory state (exhaled breath, inhaled, etc.) can be determined based on the difference between the estimated current command value Ie and the actual current value Ir.

Then, the control unit 30 obtains a difference between the estimated current command value Ie and the actual current value Ir as a current deviation D0. Furthermore, the control unit 30 obtains a deviation differential value obtained by differentiating the current deviation D0. In the present embodiment, the control unit 30 obtains a first deviation differential value D1 obtained by differentiating the current deviation D0 once and a second deviation differential value D2 obtained by differentiating the current deviation D0 twice.

FIG. 7 shows waveforms of the gas flow rate value AF due to the breathing of the patient 63, the current deviation D0, the first deviation differential value D1, and the second deviation differential value D2. In addition, the waveform shown in FIG. 7 shows the case where exhalation and inhalation are artificially reproduced. The waveform of the second deviation differential value D2 indicates the result of quantization (“0” or “1”) based on a predetermined threshold (for example, the third determination value). For example, “1” is set when the second deviation differential value D2 is smaller than the threshold value, and “0” is set when the second deviation differential value D2 is equal to or larger than the threshold value.

As shown in FIG. 7, the timing at which the first deviation differential value D1 obtained by differentiating the current deviation D0 once approaches the timing at which the gas flow rate value AF changes compared to the change in the current deviation D0. In addition, the timing at which the second deviation differential value D2 obtained by differentiating the current deviation D0 twice approaches the timing at which the gas flow rate value AF changes compared to the change in the first deviation differential value D1. Therefore, by using the current deviation D0 and the first and second differential differential values D1 and D2, the timing for determining respiration can be brought close to the actual expiration timing. And the misjudgment by noise etc. can be prevented by using the electric current deviation D0 and the 1st, 2nd deviation differential value D1, D2.

The control unit 30 determines the state of breathing based on the current deviation D0 and the first and second deviation differential values D1 and D2. For example, the control unit 30 determines that the current deviation D0 is smaller than the determination value (−0.005), the first deviation differential value D1 is smaller than the first differentiation determination value (−4), and the second deviation differential value D2 Is smaller than the second differential determination value (0), it is determined as an expired state. If the control unit 30 determines that the state is an exhalation state, the control unit 30 reduces the rotational speed command Vm for the motor 23 and decreases the rotational speed of the fan 22. Thereby, the pressure of the gas supplied with respect to the patient 63 becomes low. As a result, the difficulty in breathing in the patient 63 is reduced.

The control unit 30 acquires the correction command value Pc based on the current deviation D0 and the first and second deviation differential values D1, D2, and the pressure command value P1 based on the reference pressure command value P0 and the correction command value Pc. Is calculated. Then, the control unit 30 outputs a rotational speed command Vm that designates the rotational speed of the fan that is driven via the drive unit based on the pressure command value P1. The control unit 30 estimates a torque command in the motor 23 based on the rotational speed command Vm, and estimates an estimated current command value Ie based on the torque command. Therefore, a torque command in the motor 23 can be estimated based on the rotation speed command Vm of the motor 23, and the estimated current command value Ie in the motor 23 can be easily estimated based on the torque command. Then, by obtaining the correction command value Pc based on the result of comparing the estimated current command value Ie and the actual current value Ir, the rotational speed command Vm to the motor 23, that is, the rotational speed of the fan 22 can be obtained with a simple configuration. It can be easily changed.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The control unit 30 of the CPAP device 10 obtains an estimated current command value Ie obtained by estimating the current value flowing through the motor 23 from the rotation speed command Vm for the motor 23 that rotationally drives the fan 22. The actual current value Ir of the fan 22 is obtained by the current sensor 42. The current (actual current value Ir) flowing through the motor 23 varies depending on the respiratory state of the patient 63 to which the mask 62 is attached. The respiratory state in the patient 63 appears as a change in load on the motor 23. For example, when the patient 63 is in an inhalation state, the load on the motor 23 is small, and when the patient 63 is in an exhalation state, the load on the motor 23 is large. Therefore, it is possible to determine the respiratory state (exhaled breath, inhaled, etc.) based on the difference between the actual current value Ir that changes according to the load and the estimated current command value Ie.

(2) The control unit 30 obtains the difference between the estimated current command value Ie and the actual current value Ir as a current deviation D0. Furthermore, the control unit 30 obtains a deviation differential value obtained by differentiating the current deviation D0. In the present embodiment, the control unit 30 obtains a first deviation differential value D1 obtained by differentiating the current deviation D0 once and a second deviation differential value D2 obtained by differentiating the current deviation D0 twice. The timing at which the first deviation differential value D1 obtained by differentiating the current deviation D0 once approaches the timing at which the gas flow rate value AF changes compared to the change in the current deviation D0. In addition, the timing at which the second deviation differential value D2 obtained by differentiating the current deviation D0 twice approaches the timing at which the gas flow rate value AF changes compared to the change in the first deviation differential value D1. Therefore, by using the current deviation D0 and the first and second differential differential values D1 and D2, the timing for determining respiration can be brought close to the actual expiration timing. And the misjudgment by noise etc. can be prevented by using the electric current deviation D0 and the 1st, 2nd deviation differential value D1, D2.

(3) The control unit 30 determines the breathing state based on the current deviation D0 and the first and second deviation differential values D1 and D2. For example, the control unit 30 determines that the current deviation D0 is smaller than the determination value (−0.005), the first deviation differential value D1 is smaller than the first differentiation determination value (−4), and the second deviation differential value D2 Is smaller than the second differential determination value (0), it is determined as an expired state. When the control unit 30 determines that the state is an exhalation state, the control unit 30 can lower the rotational speed command Vm for the motor 23 and reduce the rotational speed of the fan 22. As a result, the pressure (gas flow rate) of the gas supplied to the patient 63 is lowered. As a result, the difficulty in breathing in the patient 63 can be reduced.

(4) The determination unit 38 of the control unit 30 acquires the correction command value Pc based on the current deviation D0 and the first and second deviation differential values D1 and D2, and determines the reference pressure command value P0 and the correction command value Pc. Based on the above, the pressure command value P1 is calculated. Then, the control unit 30 outputs a rotation speed command Vm of the motor 23 that drives the fan 22 based on the pressure command value P1. The current command value estimation unit 34 estimates a torque command in the motor 23 based on the rotation speed command Vm, and estimates an estimated current command value Ie based on the torque command. Therefore, the estimated current command value Ie in the motor 23 can be easily estimated based on the rotational speed command Vm of the motor 23. Then, by obtaining the correction command value Pc based on the result of comparing the estimated current command value Ie and the actual current value Ir, the rotational speed command Vm to the motor 23, that is, the rotational speed of the fan 22 can be obtained with a simple configuration. It can be easily changed.

In addition, you may implement each said embodiment in the following aspects.
In the above-described embodiment, the case where gas (for example, air) is supplied as the fluid has been described. However, for example, breathable gas (including a predetermined amount of gas) may be used as the gas. Moreover, in the said embodiment, although the CPAP apparatus was illustrated as a use of a pump apparatus, you may use for the use which supplies the liquid as a fluid.

In the above embodiment, the determination is made using the current deviation D0, the first deviation differential value D1 obtained by differentiating the current deviation D0 once, and the second deviation differential value D2 obtained by differentiating twice. In contrast, the determination may be made using the current deviation D0 and the first deviation differential value D1. In this case, as compared with the case where the expiration state (expiration timing) is determined using only the current deviation D0, the estimated expiration timing is earlier, and the fluid discharge pressure can be suitably controlled. Further, expiration (expiration timing) may be determined using the current deviation D0 and the second deviation differential value D2.

In the above embodiment, the second differential derivative value D2 is calculated using the two-time differentiator 37. However, the second differential derivative value D2 may be obtained, for example, two one-time differentiators. You may make it obtain the 2nd deviation differential value D2 differentiated twice using.

In the above embodiment, the circuit unit included in the control unit 30 may be changed as appropriate. For example, the drive unit 39 shown in FIG. 4 may be provided in a part different from the control unit 30.

DESCRIPTION OF SYMBOLS 10 ... Continuous positive airway pressure (CPAP) apparatus as a pump apparatus, 11 ... Housing | casing, 14 ... Inlet, 15 ... Discharge port, 21 ... Fan, 23 ... Motor (drive part), 30 ... Control unit, 31 and 32 ... adder (rotation speed control unit), 33 ... controller (rotation speed control part), 34 ... current command value estimation part, 35 ... current value comparison part, 36 ... differentiator (differentiating means), 37 ... double differentiator (Differentiating means), 38 ... determination unit (rotation speed control unit), 42 ... current sensor (current value measuring unit), Ir ... actual current value, Ie ... estimated current command value, D0 ... current deviation, D1 ... first Deviation differential value (deviation differential value), D2 ... second deviation differential value (deviation differential value), Vm ... rotational speed command, P0 ... reference pressure command value, Pc ... correction command value, P1 ... pressure command value.

Claims

A pumping device used for positive airway pressure,
With fans,
A drive unit for rotationally driving the fan;
An inlet into which the fluid flows,
A discharge port for discharging the fluid by rotational driving of the fan;
A current command value estimator for estimating an estimated current command value from the rotational speed command of the fan;
A current value measuring unit for measuring an actual current value flowing through the driving unit;
A current value comparison unit that compares the estimated current command value with the actual current value and obtains a current deviation that is a deviation between the estimated current command value and the actual current value;
Differentiating means for obtaining a deviation differential value obtained by differentiating the current deviation;
A rotation speed control unit that generates the rotation speed command based on the current deviation and the deviation differential value;
A drive unit for supplying a drive current to the drive unit based on the rotation speed command;
Having a pump device.
The rotational speed control unit reduces the rotational speed command when the current deviation and the deviation differential value are smaller than the corresponding determination values;
The pump device according to claim 1.
The differentiating means obtains a first deviation differential value obtained by differentiating the current deviation once and a second deviation differential value obtained by differentiating the current deviation twice,
The rotational speed control unit generates the rotational speed command based on at least one of the first deviation differential value and the second deviation differential value and a current deviation;
The pump device according to claim 1.
The rotational speed control unit reduces the rotational speed command when at least one of the first deviation differential value, the second deviation differential value, and the current deviation is smaller than a corresponding determination value;
The pump device according to claim 3.
The rotation speed control unit obtains a correction command value based on the current deviation and the deviation differential value, calculates a pressure command value based on a reference pressure command value and the correction command value, and sets the pressure command value Based on the rotation speed command,
The current command value estimating unit estimates a torque command in the drive unit based on the rotation speed command, and estimates the estimated current command value based on the torque command;
The pump device according to any one of claims 1 to 4, wherein:
The pump device according to any one of claims 1 to 5, wherein a determination value to be compared with the current deviation and the deviation differential value is set according to an expiration state.