JP2020007909A - Pump device and control method of pump device - Google Patents

Abstract

To solve such a problem that a conventional control method of a pump has a risk of erroneously detecting clogging of foreign matters in the pump since the control method does not discriminate between reduction of the number of revolutions of the pump due to the clogging of the foreign matters and the reduction due to reduction of electric power supplied to the pump.SOLUTION: A pump device 1 has a pump part 20 having a motor 21, and a control device 32. The control device has a drive circuit part 31 supplying power to the motor, and a control part controlling the drive circuit part. At least one of the pump part and the control device has a detection part 33 detecting a physical quantity relating to a load of the motor. The control part determines presence or absence of abnormality on the basis of the physical quantity detected by the detection part, and controls the drive circuit part in a normal-time control mode when determining that the pump is normal, and controls the drive circuit part in the abnormal-time control mode when determining that the pump is abnormal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pump device and a control method for the pump device.

  The pump control method disclosed in Patent Literature 1 detects clogging of a foreign object entangled in an impeller of a pump based on the rotation speed of the pump.

JP 2006-29222 A

  However, even when the power supplied to the pump decreases, the rotation speed of the pump decreases. In the pump control method disclosed in Patent Document 1, when the rotation speed of the pump decreases, whether the rotation speed of the pump decreases due to clogging of foreign matter or the rotation speed of the pump decreases due to a decrease in power supplied to the pump. Did not distinguish whether fell. Therefore, the pump control method disclosed in Patent Literature 1 may erroneously detect foreign matter clogging.

  In view of the above, the present invention provides a pump device and a control method of the pump device that can prevent erroneous detection of an abnormality.

  An exemplary pump device of the present invention includes a pump unit having a motor and a control device. The control device includes a drive circuit unit that energizes the motor, and a control unit that controls the drive circuit unit. At least one of the pump unit and the control device has a detection unit that detects a physical quantity related to the load of the motor. The control unit determines the presence or absence of an abnormality based on the physical quantity detected by the detection unit, controls the drive circuit unit in the normal control mode when it is determined that it is normal, determined that there is an abnormality In this case, the drive circuit section is controlled in the abnormal time control mode.

  An exemplary control method according to the present invention is a control method for a pump device including a pump unit having a motor and a drive circuit unit that energizes the motor, and detects a physical quantity related to a load of the motor. The method includes a first step, a second step of determining the presence or absence of an abnormality based on the detected physical quantity, and a third step of controlling the drive circuit unit using a result of the determination in the second step.

  According to an exemplary embodiment of the present invention, it is possible to provide a pump device and a control method of the pump device that can prevent erroneous detection of an abnormality.

FIG. 1 is a block diagram illustrating a configuration of a pump device according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a configuration of a pump unit and its periphery of the pump device according to the embodiment of the present invention. FIG. 3 is a flowchart illustrating an example of the operation of the control unit. FIG. 4 is a block diagram for explaining a first modification of the pump device according to the exemplary embodiment of the present invention. FIG. 5 is a flowchart illustrating an example of the operation of the control unit according to the first modification. FIG. 6 is a block diagram for explaining a second modification of the pump device according to the exemplary embodiment of the present invention.

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

<1. Outline of driving device>
First, a schematic configuration of a pump device according to an exemplary embodiment of the present invention will be described. FIG. 1 is a block diagram illustrating a configuration of a pump device 1 according to an embodiment of the present invention. The power supply unit 10 supplies power to the pump device 1. The pump device 1 has a pump unit 20 and a control device 30.

  In the present embodiment, the power supply unit 10 generates power using natural energy. Since the power supply unit 10 supplies power to the pump device 1, the pump device 1 of the present embodiment can be used even in an area where power infrastructure is not prepared.

  The power supply unit 10 may be, for example, any one of a solar power generation device, a wind power generation device, a wave power generation device, and a geothermal power generation device. The wave power generation device is a device that generates power using energy of waves such as seawater.

  The power supply unit 10 may include a plurality of types of power generation devices that use natural energy. In the present embodiment, the power supply unit 10 is a solar power generation device.

  The pump section 20 has a motor 21. In the present embodiment, the motor 21 is a brushless motor. FIG. 2 is a schematic diagram illustrating a configuration of the pump unit 20 and its surroundings of the pump device 1 according to the embodiment of the present invention. As shown in FIG. 2, the pump section 20 has an impeller section 22 connected to a motor 21. The impeller section 22 has blades (not shown) that are rotated by driving the motor 21.

  The pump device 1 has a running water cable 40 connected to the impeller section 22 and a water storage tank 41. The pump unit 20 is immersed in an underground water source, for example. The pump device 1 sucks up water by rotation of the impeller of the impeller section 22. The sucked water is pumped to the ground through the flowing water cable 40. The pumped water is stored in a water storage tank 41.

  The control device 30 is connected to the pump unit 20 by an electric cable, and is arranged on the ground. The control device 30 is driven by a command from an input device (not shown). The input device may be provided, for example, in a housing that accommodates the control device 30, or may be a remote controller. The input device may include, for example, a power switch that switches the control device 30 on and off. The input device may include a plurality of input keys for operating the control device 30. The input key may be, for example, a button or a touch panel.

<2. Details of control device>
The control device 30 includes a drive circuit unit 31, a control unit 32, a detection unit 33, and a notification unit 34. In the present embodiment, the drive circuit unit 31, the control unit 32, the detection unit 33, and the notification unit 34 are housed in one control box. In the present embodiment, the notification unit 34 is a display device. For example, when the notification unit 34 is a liquid crystal display device, the display screen is installed at a position visible from the outside of the control box. For example, when the notification unit 34 is an LED (Light Emitting Diode) display device, the LED emits light. The unit is installed at a position visible from the outside of the control box.

  The drive circuit unit 31 converts the power supplied from the power supply unit 10 and supplies the three-phase AC power to the pump unit 20. In the present embodiment, the drive circuit unit 31 is a PWM (Pulse Width Modulation) control type inverter.

  The control unit 32 outputs a control signal for controlling the drive circuit unit 31. In the present embodiment, the control unit 32 controls the drive circuit unit 31 with a PWM signal. The control unit 32 detects the rotation speed of the motor 21 and controls the drive circuit unit 31 so that the rotation speed of the motor 21 is maximized. In the present embodiment, the control unit 32 detects the rotation speed of the motor 21 using the motor current signal detected from the detection unit 33. In the present embodiment, the control unit 32 is a microcomputer having a CPU (Central Processing Unit) 32a and a memory 32b. The memory 32b has a ROM (Read Only Memory) and a RAM (Random Access Memory). The ROM stores programs and data necessary for controlling the driving of the motor 21. Note that some or all of the functions realized by the CPU 32a executing the programs stored in the memory 32b may be realized by hardware that does not use software. That is, the control unit 32 may be constituted by a microcomputer and hardware not using software, or may be constituted only by hardware not using software. Examples of hardware that does not use software include an ASIC (Application Specific Integrated Circuit).

  The detection unit 33 detects a physical quantity related to the load of the motor 21 and outputs a detection signal related to the detection result. The physical quantity is a quantity that can be expressed as a multiple of a predetermined physical unit, such as a current value and a voltage value. As an example of the present embodiment, the detection unit 33 detects a motor current that is a value obtained by adding a drive current supplied to the motor 21 and a back electromotive current generated when the motor 21 rotates as the physical quantity, A motor current signal, which is a detection signal, is output. In addition, as an example of the present embodiment, the detection unit 33 is a current measurement circuit configured using a shunt resistor. The shunt resistor used in the detection unit 33 is provided on a ground connected from the drive circuit unit 31 to the power supply unit 10. The detection unit 33 may be a current sensor instead of the shunt resistor.

  The notification unit 34 notifies the abnormality when the control unit 32 determines that there is an abnormality. Thereby, the user of the pump device 1 can recognize that the abnormality has occurred in the pump device 1 when the abnormality has occurred in the pump device 1. In the present embodiment, the notification unit 34 notifies the abnormality when the control unit continuously determines that there is an abnormality for a predetermined time. For example, when the notification unit 34 is a liquid crystal display device, the notification unit 34 notifies an abnormality by displaying an error message on a display screen. For example, when the notification unit 34 is an LED display device, the notification unit 34 is turned on. Alternatively, the abnormality is notified by blinking.

<3. Details of control mode>
The control unit 32 determines the presence or absence of an abnormality based on the physical quantity related to the load of the motor 21 detected by the detection unit 33, and controls the drive circuit unit 31 in the normal control mode when it is determined that the abnormality is normal. When it is determined that the driving circuit unit 31 is in the abnormal state, the driving circuit unit 31 is controlled in the abnormal time control mode. The physical quantity related to the load of the motor 21 is, for example, a value of a motor current. Here, if the power supplied to the motor 21 changes, the physical quantity related to the load of the motor 21 also changes. Therefore, if the physical quantity related to the load of the motor 21 is detected, even if the power supplied to the motor 21 fluctuates, an abnormality can be detected without erroneous detection.

  FIG. 3 is a flowchart illustrating an example of the operation of the control unit 32. When the power of the control device 30 is turned on, the operation of the flowchart shown in FIG. 3 is started. When the power of the control device 30 is turned on, the operations of the drive circuit unit 31 and the detection unit 33 are also started. The control unit 32, the drive circuit unit 31, and the detection unit 33 continue to operate until the power of the control device 30 is turned off.

  The control unit 32 controls the drive circuit unit 31 in the normal control mode while executing the processing of steps S1 to S5 shown in FIG. The control unit 32 controls the drive circuit unit 31 in the intermittent drive mode while performing the processing of steps S11 to S14 shown in FIG. The control unit 32 controls the drive circuit unit 31 in the reverse rotation mode while performing the processing of steps S21 to S23 illustrated in FIG. The control unit 32 controls the drive circuit unit 31 in the protection mode while performing the processes of steps S31 to S32 illustrated in FIG. Each of the intermittent drive mode, the reverse rotation mode, and the protection mode belongs to the abnormality control mode. Specific operations of the intermittent drive mode, the reverse rotation mode, and the protection mode will be described later.

  When the power of the control device 30 is turned on, the drive circuit unit 31 rotates the motor 21 in the first rotation direction under the control of the control unit 32 (step S1). When the motor 21 rotates in the first rotation direction, water is sucked up by the rotation of the blades of the impeller unit 22.

  Next, the control unit 32 calculates the rotation speed of the motor 21 from the motor current, and changes the threshold value used in step S3 described later according to the rotation speed of the motor 21 (step S2). Here, the threshold value is a reference value for determining whether the motor 21 is in an overload state. Since the rotation speed of the motor 21 increases as the motor current increases, in the present embodiment, the control unit 32 increases the threshold value as the rotation speed of the motor 21 increases.

  Thereafter, the control unit 32 determines whether the motor current detected by the detection unit 33 is smaller than a threshold (Step S3). That is, in step S3, it is determined whether the motor 21 is overloaded. In the present embodiment, the control unit 32 determines whether the effective value of the motor current detected by the detection unit 33 is larger than a threshold. When the impeller unit 22 is clogged with foreign matter, the rotation speed of the motor 21 decreases and the motor current increases. Therefore, it is possible to determine whether or not the impeller unit 22 is clogged with the foreign matter by the determination in step S3.

  When it is determined that the motor current detected by the detection unit 33 is larger than the threshold, the control unit 32 continues the determination result that the motor current detected by the detection unit 33 is larger than the threshold for a predetermined time (for example, one minute). It is determined whether or not it has been performed (step S4). If it is determined that it has not continued for the predetermined time, the process returns to step S1, and the processing after step S1 is executed. If it is determined that the predetermined time has been maintained, the process proceeds to step S10 described below.

  When it is determined that the motor current detected by the detection unit 33 is equal to or smaller than the threshold, the control unit 32 resets the duration determined in step S4 to zero (step S5). After the process of step S5 is performed, the process returns to step S1, and the processes after step S1 are performed.

  By executing the processing of step S4, when the motor current detected by the detection unit 33 becomes instantaneously larger than the threshold value due to noise or the like, the control mode of the control unit 32 is erroneously controlled to be normal. It is possible to prevent a transition from the mode to the abnormal time control mode.

  In step S10, the control unit 32 determines whether the motor current detected by the detection unit 33 is larger than a first predetermined value. The first predetermined value is larger than the threshold used in step S2. In the present embodiment, the control unit 32 determines whether the effective value of the motor current detected by the detection unit 33 is larger than a first predetermined value.

  When it is determined that the motor current detected by the detection unit 33 is larger than the first predetermined value, the process proceeds to step S20 described below.

  When it is determined that the motor current detected by the detection unit 33 is larger than the threshold value and equal to or smaller than the first predetermined value, the drive circuit unit 31 stops the motor 21 for a predetermined time (for example, two seconds) under the control of the control unit 32. (Step S11). As a result, the control mode of the control unit 32 shifts from the normal control mode to the intermittent drive mode. After the process of step S11 is completed, the drive circuit unit 31 rotates the motor 21 in the first rotation direction for a predetermined time (for example, two seconds) under the control of the control unit 32 (step S12). After the processing of step S12 is completed, the control unit 32 determines whether the processing of step S11 and the processing of S12 have been executed a predetermined number of times (for example, 10 times) (step S13).

  If it is determined that the processing of step S11 and the processing of S12 have not been performed a predetermined number of times, the process returns to step S11, and the processing of step S11 and thereafter is performed.

  On the other hand, when it is determined that the processing of step S11 and the processing of S12 have been executed a predetermined number of times, the drive circuit unit 31 stops the motor 21 under the control of the control unit 32 (step S14). Thus, the intermittent drive mode ends. Then, the process returns to step S1, and the processes after step S1 are executed. That is, the control mode of the control unit 32 returns to the normal control mode.

  In step S20, the control unit 32 determines whether the motor current detected by the detection unit 33 is larger than a second predetermined value. The second predetermined value is larger than the first predetermined value used in step S10. In the present embodiment, the control unit 32 determines whether the effective value of the motor current detected by the detection unit 33 is larger than a second predetermined value.

  When it is determined that the motor current detected by the detection unit 33 is larger than the second predetermined value, the process proceeds to step S31 described below.

  When it is determined that the motor current detected by the detection unit 33 is larger than the first predetermined value and equal to or less than the second predetermined value, the control of the control unit 32 causes the drive circuit unit 31 to operate the motor 21 for a predetermined time (for example, 30 seconds). Is stopped (step S21). Thereby, the control mode of the control unit 32 shifts from the normal control mode to the reverse rotation mode. After the process of step S21 is completed, under the control of the control unit 32, the drive circuit unit 31 rotates the motor 21 in a direction opposite to the first rotation direction for a predetermined time (for example, 30 seconds) (step S22). After the process of step S22 is completed, the drive circuit unit 31 stops the motor 21 under the control of the control unit 32 (step S23). Thus, the reverse rotation mode ends. Then, the process returns to step S1, and the processes after step S1 are executed. That is, the control mode of the control unit 32 returns to the normal control mode.

  In step S31, under the control of the control unit 32, the drive circuit unit 31 stops the motor 21 (step S31). As a result, the control mode of the control unit 32 shifts from the normal control mode to the protection mode. After the process of step S31 is completed, the control unit 32 determines whether or not there is an instruction to restart the operation (step S32). The command instructing to resume the operation is output from the input device described above. If it is determined that there is no command to restart the operation, the process returns to step S32, and the determination in step S32 is repeated. On the other hand, when it is determined that there is an instruction to restart the operation, the process returns to step S1, and the processes after step S1 are executed. That is, the control mode of the control unit 32 shifts from the protection mode to the normal control mode.

  While the control unit 32 controls the drive circuit unit 31 in any of the intermittent drive mode, the reverse rotation mode, and the protection mode, the notification unit 34 notifies the abnormality.

  When the control unit 32 controls the drive circuit unit 31 in the intermittent drive mode, the magnitude of the force applied to the foreign matter varies, so that it is urged that the foreign matter moves in the direction from the suction side to the discharge side of the pump unit 20. it can. Accordingly, it is possible to suppress the foreign substance from returning once in the direction from the discharge side to the suction side of the pump section 20, and it is possible to efficiently discharge the foreign substance from the suction side of the pump section 20. Further, when the control unit 32 controls the drive circuit unit 31 in the intermittent drive mode, the rotation of the motor 21 is intermittently stopped, so that the motor current is intermittently reduced even though the motor 21 is overloaded. be able to. Thus, the pump device 1 can suck up water while reducing the load on the motor 21.

  When the control unit 32 controls the drive circuit unit 31 in the reverse rotation mode, it is possible to urge the foreign substance to move in a direction from the discharge side to the suction side of the pump unit 20. For example, in the case of the configuration shown in FIG. 2, the direction from the discharge side to the suction side of the pump unit 20 substantially coincides with the direction of gravity applied to the foreign matter, so that the force for promoting the movement of the foreign matter can be increased. Therefore, clogging of the impeller section 22 with foreign matter can be more strongly eliminated than in the intermittent drive mode.

  When the control unit 32 controls the drive circuit unit 31 in the protection mode, when an overload state occurs, the motor is stopped to safely stop.

<4. Modification>
FIG. 4 is a block diagram for explaining a first modification of the pump device 1 according to the exemplary embodiment of the present invention. Hereinafter, a first modified example shown in FIG. 4 will be described.

  In the first modification, a solar power generation device is used as the power supply unit 10. When the power supply unit 10 is a photovoltaic power generator, the amount of power generation varies depending on the amount of solar radiation. However, when the pump unit 1 is used by immersing the pump unit 20 in the underground water source, if the soil collapses after the pump unit 20 is installed in the water source and the water source contains many foreign substances such as mud and gravel, the impeller Since the foreign matter is clogged in the portion 22 and the rotational speed of the motor 21 decreases, the flow rate decreases. Therefore, it is necessary to automatically remove the foreign material from the impeller portion 22 and return the flow rate to normal. However, in the method of detecting the number of revolutions of the pump as disclosed in Patent Document 1, it is not possible to determine whether the number of revolutions is decreased due to a decrease in power or the number of revolutions is decreased due to foreign matter clogging the impeller 22. The control cannot be switched to the control for removing foreign matter from the impeller section 22. Therefore, in the first modified example to be described below, even if the photovoltaic power generation device is used as the power supply unit 10, the threshold is changed in accordance with the fluctuation of the power generation amount, and the clogging of the impeller unit 22 with the foreign matter is detected. The purpose is to automatically remove foreign matter from the impeller section 22.

  The detection unit 35 is provided inside the control device 30. The detection unit 35 detects a DC voltage (solar voltage) supplied from the power supply unit 10 as a solar power generation device to the pump device 1 and a DC current (solar current) supplied to the pump device 1.

The control unit 32 tracks the maximum power point of the DC power (the product of the solar voltage and the solar current) generated by the power supply unit 10. That is, the control unit 32 performs MPPT (Maximum Power Point Tracking) control on the power supply unit 10. When the control unit 32 determines that the load of the motor 21 is not a rated load but is close to an overload state, the control unit 32 determines that foreign matter is entangled in the impeller unit 22 and performs an operation of removing foreign matter.

  FIG. 5 is a flowchart illustrating an example of the operation of the control unit 32. The flowchart shown in FIG. 5 differs from the flowchart shown in FIG. 3 only in that steps S2, S3, S10, and S20 of the flowchart shown in FIG. 3 are replaced with steps S2 ', S3', S10 ', and S20', respectively. Therefore, only steps S2 ', S3', S10 ', and S20' will be described below.

  The control unit 32 calculates the maximum power point of the DC power supplied from the power supply unit 10 to the pump device 1 from the detection result of the detection unit 35, and sets a threshold value used in step S3 ′ described below from the power supply unit 10 to the pump device 1. 1 is changed according to the maximum power point of the DC power supplied to 1. In the present embodiment, the control unit 32 increases the threshold as the maximum power point of the DC power supplied from the power supply unit 10 to the pump device 1 increases.

  In step S3 ', the control unit 32 determines whether the solar voltage detected by the detection unit 35 is smaller than a threshold.

  In step S10 ', the control unit 32 determines whether the solar voltage detected by the detection unit 35 is smaller than a first predetermined value. The first predetermined value is smaller than the threshold used in step S3 '.

  In step S20 ', the control unit 32 determines whether the solar voltage detected by the detection unit 35 is smaller than a second predetermined value. The second predetermined value is smaller than the first predetermined value used in step S10 '.

  Next, a second modification of the pump device 1 according to the exemplary embodiment of the present invention will be described. FIG. 6 is a block diagram for explaining a second modification of the pump device 1 according to the exemplary embodiment of the present invention. In the second modification shown in FIG. 6, a detection unit 33 is provided inside the pump unit 20. Further, the configuration shown in FIG. 1 may be modified so that the detection unit 33 is installed inside the drive circuit unit 31, and the configuration shown in FIG. 6 may be modified so that the detection unit 33 is installed inside the motor 21. A configuration may be adopted. Further, the first modification example shown in FIG. 4 may be further modified so that the detection unit 33 is installed inside the pump unit 20 instead of inside the control device 30.

  In the above, the configuration in which the pump device 1 does not have the power supply unit 10 has been described. However, this configuration is exemplary. The pump device 1 may have a configuration including the power supply unit 10. In the pump device 1 according to the exemplary embodiment of the present invention shown in FIG. 1, the power supply unit 10 may be a commercial AC power supply. When the power supply unit 10 is a commercial AC power supply, the drive circuit unit 31 may be configured to include an AC / DC converter that converts AC power supplied from the power supply unit 10 to the pump device 1 into DC power. The stability of the commercial AC power supply differs from country to country or region. The pump device 1 according to the exemplary embodiment of the present invention shown in FIG. 1 is particularly useful in a country or a region where the AC voltage supplied from the commercial AC power supply to the pump device 1 is large.

  In addition, the configurations of the above-described embodiments and modified examples are merely examples of the present invention. The configurations of the embodiment and the modified examples may be appropriately changed without departing from the technical idea of the present invention. Further, a plurality of embodiments and modifications may be implemented in combination as far as possible.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a pump device having a pump unit having a motor and a control method of a pump device having a pump unit having a motor.

DESCRIPTION OF SYMBOLS 1 ... Pump apparatus, 10 ... Power supply part, 20 ... Pump part, 21 ... Motor, 22 ... Impeller part, 30 ... Control device, 31 ... Drive circuit part, 32 ... Control unit, 33 ... Detection unit, 34 ... Notification unit, 40 ... Flowing water cable, 41 ... Reservoir

Claims (11)

A pump unit having a motor,
A control device;
Has,
The control device includes:
A drive circuit unit for energizing the motor,
A control unit that controls the drive circuit unit;
Has,
At least one of the pump unit and the control device has a detection unit that detects a physical quantity related to the load of the motor,
The control unit includes:
Determine the presence or absence of an abnormality based on the physical quantity detected by the detection unit,
A pump device that controls the drive circuit unit in a normal control mode when it is determined to be normal, and controls the drive circuit unit in an abnormal control mode when it is determined to be abnormal. The detection unit detects a motor current including a drive current supplied to the motor,
2. The pump device according to claim 1, wherein the control unit determines that the motor current is abnormal when the motor current detected by the detection unit is larger than a threshold, and changes the threshold according to the rotation speed of the motor. 3. The pump device is supplied with DC power from a solar power generation device,
The detection unit detects an output voltage of the solar power generation device,
The control unit determines that the output voltage of the photovoltaic power generator detected by the detection unit is abnormal when the output voltage is smaller than a threshold, and changes the threshold according to the maximum power point of the DC power. Item 2. The pump device according to item 1. The normal control mode is a control mode in which the motor is continuously rotated in the first rotation direction,
4. The abnormal state control mode according to claim 1, wherein the abnormal state control mode includes a control mode in which control for rotating the motor in the first rotation direction and control for stopping the motor are alternately repeated. 5. Pump device. The normal control mode is a control mode in which the motor is continuously rotated in the first rotation direction,
The pump device according to claim 1, wherein the abnormal-time control mode includes a control mode in which the motor is rotated in a direction opposite to the first rotation direction.   The pump device according to claim 4, wherein the abnormal-time control mode includes a control mode for stopping driving of the motor. The control unit includes:
When it is determined that there is an abnormality, one control mode is selected based on the physical quantity detected by the detection unit from the plurality of control modes corresponding to the abnormal time control mode, and the drive is performed in the selected control mode. The pump device according to claim 6, which controls a circuit unit. The control unit includes:
If the determination that the abnormality is continued for a predetermined time, the drive circuit unit is controlled in the abnormal time control mode,
The pump according to any one of claims 1 to 7, wherein if the determination that the abnormality is not made has continued for the predetermined time, the presence or absence of the abnormality is determined again based on the physical quantity detected by the detection unit. apparatus.   The pump device according to any one of claims 1 to 7, further comprising a notification unit that notifies the abnormality when the control unit determines that there is an abnormality.   The pump device according to claim 8, further comprising: a notification unit that notifies the abnormality when the control unit determines that the abnormality is continued for a predetermined time. A pump unit having a motor, and a drive circuit unit that energizes the motor, a control method of a pump device having:
A first step of detecting a physical quantity related to the load of the motor;
A second step of determining the presence or absence of an abnormality based on the detected physical quantity;
A third step of controlling the drive circuit unit using a result of the determination in the second step;
A control method comprising:

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