WO2018084000A1

WO2018084000A1 - Pump device and method for controlling pump device

Info

Publication number: WO2018084000A1
Application number: PCT/JP2017/037947
Authority: WO
Inventors: 陽一富永
Original assignee: 日本電産テクノモータ株式会社
Priority date: 2016-11-01
Filing date: 2017-10-20
Publication date: 2018-05-11
Also published as: JP2020007909A

Abstract

This pump device has a pump unit having an electric motor, and a control device. The control device has a drive circuit unit that energizes the electric motor, and a control unit that controls the drive circuit unit. The pump unit and/or the control device has a detection unit that detects a physical quantity pertaining to the load of the electric motor. The control unit determines whether there are any abnormalities on the basis of the physical quantity detected by the detection unit, controls the drive circuit unit in a normal control mode when conditions are determined to be normal, and controls the drive circuit unit in an abnormal control mode when conditions are determined to be abnormal.

Description

Pump device and control method of pump device

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

The pump control method disclosed in Patent Document 1 detects clogging of foreign matter entangled with a pump impeller based on the number of revolutions of the pump.

JP 2006-29222 A

However, even if the power supplied to the pump decreases, the pump speed decreases. In the control method of the pump disclosed in Patent Document 1, when the rotation speed of the pump decreases, the rotation speed of the pump decreases due to a decrease in power supplied to the pump, whether the rotation speed of the pump decreases due to clogging of foreign matter. It does not distinguish whether it has fallen. For this reason, the pump control method disclosed in Patent Document 1 may erroneously detect clogging of foreign matter.

In view of the above, the present invention provides a pump device and a pump device control method capable of preventing erroneous detection of abnormality.

The 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 includes a detection unit that detects a physical quantity related to the load of the motor. The control unit determines whether or not there is an abnormality based on the physical quantity detected by the detection unit, and controls the drive circuit unit in a normal time control mode when determining that it is normal, and determines that it is abnormal In this case, the drive circuit unit is controlled in the abnormal time control mode.

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

According to the exemplary present invention, it is possible to provide a pump device and a pump device control method capable of preventing erroneous detection of abnormality.

FIG. 1 is a block diagram showing a configuration of a pump device according to an embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a configuration of a pump unit and its surroundings included in 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 in 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 drive 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 showing 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 includes 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 part 10 supplies electric power to the pump apparatus 1, the pump apparatus 1 of this embodiment can be used also in the area where the 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 wave energy 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 unit 20 has a motor 21. In the present embodiment, the motor 21 is a brushless motor. FIG. 2 is a schematic diagram illustrating the configuration of the pump unit 20 included in the pump device 1 according to the embodiment of the present invention and the periphery thereof. As shown in FIG. 2, the pump unit 20 has an impeller unit 22 connected to a motor 21. The impeller portion 22 has blades (not shown) that rotate when the motor 21 is driven.

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

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

<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 accommodated 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 part is installed at a position where it can be seen from the outside of the control box.

The drive circuit unit 31 converts the power supplied from the power supply unit 10 and supplies 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 rotational speed of the motor 21 and controls the drive circuit unit 31 so that the rotational 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 includes 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 program stored in the memory 32b may be realized by hardware that does not use software. That is, the control unit 32 may be configured by a microcomputer and hardware that does not use software, or may be configured only by hardware that does not use software. As hardware that does not use software, for example, there is 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 an amount that can be expressed as a multiple of a defined physical unit, such as a current value or 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 energized to the motor 21 as the physical quantity and a back electromotive current generated when the motor 21 rotates. A motor current signal that 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 installed on the 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 an abnormality has occurred in the pump device 1 when an abnormality has occurred in the pump device 1. In the present embodiment, the notification unit 34 notifies the abnormality when it is determined that there is an abnormality by the control unit for a predetermined time. For example, when the notification unit 34 is a liquid crystal display device, the notification unit 34 notifies the abnormality by displaying an error message on the display screen. For example, when the notification unit 34 is an LED display device, the notification unit 34 is lit. Alternatively, the abnormality is notified by blinking.

<3. Details of control mode>
The control unit 32 determines the presence / absence of 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 time control mode when it is determined to be normal. When it is determined that 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, the value of the motor current. Here, if the electric power supplied to the motor 21 varies, the physical quantity related to the load of the motor 21 also varies. Therefore, if a physical quantity related to the load of the motor 21 is detected, an abnormality can be detected without erroneous detection even if the power supplied to the motor 21 fluctuates.

FIG. 3 is a flowchart showing an example of the operation of the control unit 32. When the power supply of the control device 30 is turned on, the operation of the flowchart shown in FIG. 3 is started. Further, when the power supply 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 control device 30 is powered off.

The control unit 32 controls the drive circuit unit 31 in the normal time control mode while executing the processes of steps S1 to S5 shown in FIG. The control unit 32 controls the drive circuit unit 31 in the intermittent drive mode while executing the processes of steps S11 to S14 shown in FIG. The control unit 32 controls the drive circuit unit 31 in the reverse rotation mode while executing the processing of steps S21 to S23 shown in FIG. The control unit 32 controls the drive circuit unit 31 in the protection mode while executing the processes of steps S31 to S32 shown in FIG. The intermittent drive mode, the reverse rotation mode, and the protection mode belong to the abnormal time control mode. Specific movements in 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 impeller 22 blades.

Next, the control unit 32 calculates the rotation speed of the motor 21 from the motor current, and changes the threshold 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 or not the motor 21 is in an overload state. If the motor current is increased, the number of rotations of the motor 21 is increased. Therefore, in the present embodiment, the control unit 32 increases the threshold value as the number of rotations of the motor 21 increases.

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

When it is determined that the motor current detected by the detection unit 33 is larger than the threshold value, the control unit 32 continues the determination result that the motor current detected by the detection unit 33 is larger than the threshold value for a predetermined time (for example, 1 minute). It is determined whether or not (step S4). When it is determined that the predetermined time has not been continued, the process returns to step S1 and the processes after step S1 are executed. If it is determined that the predetermined time has continued, the process proceeds to step S10 described later.

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

By executing the process of step S4, when the motor current detected by the detection unit 33 instantaneously becomes larger than the threshold due to noise or the like, the control mode of the control unit 32 is erroneously controlled during normal operation. Transition from the mode to the control mode at the time of abnormality can be prevented.

In step S10, the controller 32 determines whether or not the motor current detected by the detector 33 is greater 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 or not the effective value of the motor current detected by the detection unit 33 is greater 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 later.

When it is determined that the motor current detected by the detection unit 33 is greater than the threshold value and equal to or less than the first predetermined value, the drive circuit unit 31 stops the motor 21 for a predetermined time (for example, 2 seconds) under the control of the control unit 32. (Step S11). Thereby, the control mode of the control unit 32 shifts from the normal time 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, 2 seconds) under the control of the control unit 32 (step S12). After the process of step S12 is completed, the control part 32 determines whether the process of step S11 and the process of S12 were each performed predetermined times (for example, 10 times) (step S13).

If it is determined that the process of step S11 and the process of S12 have not been executed a predetermined number of times, the process returns to step S11 and the processes after step S11 are executed.

On the other hand, when it is determined that the process of step S11 and the process of S12 are each performed a predetermined number of times, the drive circuit unit 31 stops the motor 21 under the control of the control unit 32 (step S14). Thereby, the intermittent drive mode ends. And it returns to step S1 and the process after step S1 is performed. That is, the control mode of the control unit 32 returns to the normal time control mode.

In step S20, the controller 32 determines whether or not the motor current detected by the detector 33 is greater 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 or not the effective value of the motor current detected by the detection unit 33 is greater 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 later.

When it is determined that the motor current detected by the detection unit 33 is greater than the first predetermined value and less than or equal to the second predetermined value, the drive circuit unit 31 is controlled by the control unit 32 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 time control mode to the reverse rotation mode. After the process of step S21 is completed, 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) under the control of the control unit 32 (step S22). After the process of step S22 is completed, the drive circuit part 31 stops the motor 21 by control of the control part 32 (step S23). Thereby, reverse rotation mode is complete | finished. And it returns to step S1 and the process after step S1 is performed. That is, the control mode of the control unit 32 returns to the normal time control mode.

In step S31, the drive circuit unit 31 stops the motor 21 under the control of the control unit 32 (step S31). As a result, the control mode of the control unit 32 shifts from the normal time control mode to the protection mode. After the process of step S31 is completed, the control part 32 determines whether there exists a command instruct | indicating restarting driving | operation (step S32). A command for instructing to resume operation is output from the input device described above. When it is determined that there is no instruction for instructing to resume 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 a command for instructing to resume 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 time control mode.

In addition, 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 the foreign matter is encouraged to move in the direction from the suction side to the discharge side of the pump unit 20. it can. Thereby, it is possible to suppress the foreign matter from returning in the direction from the discharge side of the pump unit 20 to the suction side, and the foreign matter can be efficiently discharged from the suction side of the pump unit 20. In addition, 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 in an overload state. be able to. Thereby, the pump apparatus 1 can suck up water, reducing the burden 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 matter to move in the direction from the discharge side of the pump unit 20 toward the suction side. For example, in the case of the configuration shown in FIG. 2, the direction from the discharge side of the pump unit 20 toward the suction side and the direction of gravity applied to the foreign matter substantially coincide with each other, so that the force that promotes the movement of the foreign matter can be increased. Therefore, clogging of the impeller portion 22 due to the foreign matter can be more strongly resolved than in the intermittent drive mode.

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

<4. Modification>
FIG. 4 is a block diagram for explaining a first modification of the pump device 1 according to an exemplary embodiment of the present invention. Hereinafter, a first modification 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 solar power generation device, the power generation amount varies depending on the amount of solar radiation. However, when the pump unit 20 is used by immersing the pump unit 20 in an underground water source, if the soil collapses after the pump unit 20 is installed in the water source and the water source contains a large amount of foreign matter such as mud and gravel, the impeller Since the part 22 is clogged with foreign matter and the rotational speed of the motor 21 is reduced and the flow rate decreases, it is necessary to automatically remove the foreign matter from the impeller part 22 and return the flow rate to normal. However, as in Patent Document 1, in the method of detecting the rotational speed of the pump, it is impossible to determine whether the rotational speed is decreased due to power reduction or the rotational speed is decreased due to the impeller unit 22 being clogged with foreign matter. Therefore, it is not possible to switch to the control for removing the foreign matter from the impeller portion 22. Therefore, in the first modification described below, even if the solar power generation device is used as the power supply unit 10, the threshold value is changed according to the fluctuation of the power generation amount to detect clogging of foreign matter in the impeller unit 22, The object is to automatically remove foreign matter from the impeller portion 22.

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

The control unit 32 tracks the maximum power point of DC power (product of solar voltage and 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 a foreign object is tangled in the impeller unit 22 and performs a foreign object removal operation.

FIG. 5 is a flowchart showing 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. Accordingly, 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 later from the power supply unit 10 to the pump device. 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 value as the maximum power point of the DC power supplied from the power supply unit 10 to the pump device 1 is larger.

In step S3 ', the control unit 32 determines whether or not the solar voltage detected by the detection unit 35 is smaller than a threshold value.

In step S10 ', the control unit 32 determines whether or not 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 or not 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 an 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 an exemplary embodiment of the present invention. In the second modification shown in FIG. 6, the detection unit 33 is installed 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. The configuration shown in FIG. 6 may be modified and the detection unit 33 is installed inside the motor 21. You may make it the structure made. Further, the first modification shown in FIG. 4 may be further modified so that the detection unit 33 is installed not inside the control device 30 but inside the pump unit 20.

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 a power supply unit 10. Moreover, in the pump apparatus 1 which concerns on exemplary embodiment of this invention shown in FIG. 1, the power supply part 10 may be a commercial alternating current power supply. When the power supply unit 10 is a commercial AC power supply, the drive circuit unit 31 may 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 commercial AC power varies by 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 region where fluctuations in the AC voltage supplied from the commercial AC power source to the pump device 1 are large.

In addition, the configurations of the above-described embodiments and modifications are merely examples of the present invention. The configuration of the embodiment and the modification may be changed as appropriate without departing from the technical idea of the present invention. In addition, a plurality of embodiments and modifications may be implemented in combination within a possible range.

The present invention can be used for a pump device having a pump unit having a motor and a control method for 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 apparatus, 31 ... Drive circuit part, 32 ... Control part, 33 ... Detection part, 34 ... Notification part, 40 ... Running water cable, 41 ... Water tank

Claims

A pump unit having a motor;
A control device;
Have
The control device includes:
A drive circuit unit for energizing the motor;
A control unit for controlling the drive circuit unit;
Have
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 controller is
Determine the presence or absence of abnormality based on the physical quantity detected by the detection unit,
A pump device that controls the drive circuit unit in a normal time control mode when it is determined to be normal, and controls the drive circuit unit in an abnormal time control mode when it is determined to be abnormal.
The detection unit detects a motor current including a drive current passed through the motor,
The pump device according to claim 1, wherein the control unit determines that the motor current detected by the detection unit is abnormal when the motor current is larger than a threshold value, and changes the threshold value according to the number of rotations of the motor.
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 said control part determines with it being abnormal when the output voltage of the said photovoltaic power generation apparatus detected by the said detection part is smaller than a threshold value, The said threshold value is changed according to the maximum electric power point of the said DC power, Item 2. The pump device according to Item 1.
The normal time control mode is a control mode in which the motor continues to rotate in the first rotation direction,
4. The control mode according to claim 1, wherein the abnormal-time 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. Pump device.
The normal time control mode is a control mode in which the motor continues to rotate in the first rotation direction,
5. 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. 6.
The pump device according to claim 4 or 5, wherein the abnormal time control mode has a control mode for stopping driving of the motor.
The controller is
When it is determined that there is an abnormality, one control mode is selected from a plurality of control modes corresponding to the abnormal time control mode based on the physical quantity detected by the detection unit, and the drive is performed in the selected control mode. The pump device according to claim 6 which controls a circuit part.
The controller is
When the determination that it is abnormal continues for a predetermined time, the drive circuit unit is controlled in an abnormal time control mode,
The pump according to any one of claims 1 to 7, wherein when the determination that the abnormality is not continued for the predetermined time, the presence or absence of an 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 notifying unit for notifying the abnormality when it is determined that the abnormality is continuously performed by the control unit for a predetermined time.
A control method for a pump device having a pump unit having a motor and a drive circuit unit for energizing the motor,
A first step of detecting a physical quantity relating 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 for controlling the drive circuit unit using the determination result in the second step;
A control method.