JP2020033871A - Pump device and method for controlling pump device - Google Patents

Abstract

To provide a pump device and a method for controlling a pump device, which can discriminate not only the presence or absence of an abnormality but also the type of the abnormality.SOLUTION: A pump device has a pump section 20 having a motor 21, and a control device 30. The control device has a drive circuit part 31 that energizes the motor, a control part 32 that controls the drive circuit part, and an abnormality detection part 34. At least one of the pump section and the control device has a detection part 33 that detects a physical quantity relating to a load on the motor. The abnormality detection part has a storage unit 34 that stores information relating to the load on the motor in a normal time, a comparison unit 34b that compares the information relating to the load on the motor, which is based on the physical quantity detected by the detection unit, with the information stored in the storage unit, and a discrimination unit 34c that discriminates the presence or absence of an abnormality and the type thereof on the basis of a comparison result of the comparison unit.SELECTED DRAWING: Figure 1

Description

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

  The pump operation check device disclosed in Patent Literature 1 checks the operation of the pump and determines the performance degradation of the pump based on the discharge amount detected by the flow meter.

JP 2000-329093 A

  However, the main causes of the decrease in the discharge amount are considered to be performance deterioration of the pump itself and clogging of the pipe. When there are a plurality of types of abnormalities as described above, the repair method differs depending on the type of the abnormalities. Therefore, simply detecting the abnormalities is not sufficient, and it is necessary to determine the types of the abnormalities.

  In view of the above, the present invention provides a pump device and a pump device control method capable of determining not only the presence or absence of an abnormality but also the type of the abnormality.

  According to an exemplary pump device of the present invention, the pump device includes a pump unit having a motor and a control device. The control device includes a drive circuit unit that energizes the motor, a control unit that controls the drive circuit unit, and an abnormality detection 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 abnormality detection unit is a storage unit that stores information about the load of the motor in a normal state, information about the load of the motor based on the physical quantity detected by the detection unit, and information that is stored in the storage unit. And a determination unit that determines the presence or absence and type of abnormality based on the comparison result of the comparison unit.

  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 includes information on a load of the motor in a normal state. , A second step of detecting a physical quantity relating to the load of the motor, and comparing information relating to the load of the motor based on the detected physical quantity with stored information relating to the load of the motor. The method includes a third step and a fourth step of determining the presence / absence and type of abnormality based on the comparison result.

  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 determine not only the presence or absence of an abnormality but also the type of the 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 graph showing the relationship between motor current and motor speed. FIG. 4 is a graph showing the relationship between motor current and motor power consumption. FIG. 5 is a block diagram for explaining a second modification of the pump device according to the exemplary embodiment of the present invention. FIG. 6 is a graph showing the relationship between the motor current and the solar power.

  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, an abnormality detection unit 34, a notification unit 35, and a protection unit 36. In the present embodiment, the drive circuit unit 31, the control unit 32, the detection unit 33, the abnormality detection unit 34, the notification unit 35, and the protection unit 36 are housed in one control box. In the present embodiment, the notification unit 35 is a display device. For example, when the notification unit 35 is a liquid crystal display device, the display screen is installed at a position visible from outside the control box. For example, when the notification unit 35 is an LED display device, light emission of an LED (Light Emitting Diode) 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, the abnormality detection unit 34, and the protection unit 36 are a single microcomputer having a CPU (Central Processing Unit) and a memory. The memory 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. Some or all of the functions realized by the CPU executing the programs stored in the memory may be realized by hardware without using software. That is, the control unit 32, the abnormality detection unit 34, and the protection unit 36 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. 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 abnormality detector 34 detects an abnormality of the pump device 1 using the detection signal output from the detector 33. Details of the abnormality detection unit 34 will be described later.

  The notification unit 35 notifies the type of the abnormality determined by the determination unit 34c when the determination unit 34c included in the abnormality detection unit 34 determines that there is an abnormality. Thereby, the user of the pump device 1 can recognize the occurrence of the abnormality and the type of the abnormality in the pump device 1 when the abnormality occurs in the pump device 1, and perform an appropriate repair method according to the type of the abnormality. You can choose. For example, when the notification unit 35 is a liquid crystal display device, the notification unit 35 notifies the abnormality by displaying an error message indicating the occurrence of the abnormality and the type of the abnormality on the display screen. For example, the notification unit 35 uses an LED display device. In some cases, the notification unit 35 notifies the occurrence of the abnormality and the type of the abnormality by lighting or blinking in a lighting pattern or a blinking pattern according to the type of the abnormality.

  The protection unit 36 outputs a stop command to stop the driving of the motor 21 to the control unit 32 when the determination unit 34c included in the abnormality detection unit 34 determines that there is an abnormality. When receiving the stop command from the protection unit 36, the control unit 32 controls the drive circuit unit 31 according to the stop command to stop driving the motor 21. Since the drive of the motor 21 is stopped when an abnormality occurs, it is possible to prevent the device from operating in an abnormal state.

<3. Details of abnormality detector>
The abnormality detection unit 34 has a storage unit 34a, a comparison unit 34b, and a determination unit 34c.

  The storage unit 34a stores information on the load of the motor 21 in a normal state. The storage unit 34a stores, for example, information on a relationship between two types of physical quantities in a normal state as information on a load of the motor 21 in a normal state. The information on the relationship between the two types of physical quantities stored in the storage unit 34a may be, for example, data of a functional expression indicating the relationship between the two types of physical quantities, or a functional expression indicating the relationship between the two types of physical quantities. (For example, the slope of a linear function expression) or a data table indicating the relationship between two types of physical quantities. In the present embodiment, the storage unit 34a stores information relating to the relationship between the motor current and the motor speed during normal operation.

  The comparing unit 34b compares the information on the load of the motor 21 based on the physical quantity detected by the detecting unit 33 with the information stored in the storage unit 34a. The comparison unit 34b compares, for example, information on the relationship between the two types of physical quantities based on the detection signal output from the detection unit 33 and information on the relationship between the two types of physical quantities based on the information stored in the storage unit 34a. Compare.

  The comparison unit 34b generates information on the relationship between the two types of physical quantities based on the detection signal output from the detection unit 33 according to the data format of the information on the relationship between the two types of physical quantities stored in the storage unit 34a. I do. For example, when the information on the relationship between the two types of physical quantities stored in the storage unit 34a is data of a functional expression indicating the relationship between the two types of physical quantities, the comparison unit 34b is output from the detection unit 33. Data of a functional expression indicating a relationship between two types of physical quantities based on the detection signal is generated.

  In the present embodiment, the comparison unit 34b includes information relating to the relationship between the motor current and the motor rotation speed based on the detection signal output from the detection unit 33, and the motor current and the motor rotation speed based on the information stored in the storage unit 34a. Compare with information about the relationship between.

  In the present embodiment, the comparing unit 34b calculates the motor rotation speed based on the waveform of the motor current detected by the detecting unit 33. In addition, since control of the rotation speed of the motor 21 requires detection of the motor rotation speed, the control unit 32 must also calculate the motor rotation speed based on the waveform of the motor current detected by the detection unit 33. No. The function of calculating the motor rotation speed based on the waveform of the motor current detected by the detection unit 33 is desirably shared by the comparison unit 34b and the control unit 32.

  The determination unit 34c determines the presence or absence and the type of the abnormality based on the comparison result of the comparison unit 34b. As described above, the comparison result of the comparison unit 34b is obtained by comparing the information on the load of the motor 21 based on the physical quantity detected by the detection unit 33 with the information on the load of the motor 21 in the normal state stored in the storage unit 34a. The result. The load of the motor 21 is different between a normal time and an abnormal time. Further, the load on the motor 21 differs depending on the type of abnormality. Therefore, the determination unit 34c can determine not only the presence / absence of an abnormality but also the type of the abnormality by performing the determination based on the comparison result of the comparison unit 34b.

  For example, the determination unit 34c is configured to determine a relationship between a first index indicating a relationship between two types of physical quantities based on the detection signal output from the detection unit 33 and two types of physical quantities based on information stored in the storage unit 34a. Is determined to be normal when the difference between the second index and the second index is within a predetermined range, and is determined to be abnormal when the difference is outside the predetermined range. If the difference between the first index and the second index is within a predetermined range, it is determined to be normal, so that it is possible to prevent the abnormality detection unit 34 from erroneously detecting an abnormality due to noise or the like.

  FIG. 3 is a graph showing the relationship between motor current and motor speed. The characteristic line L1 is a characteristic line indicating the relationship between the motor current and the motor speed during normal operation. A characteristic line L2 is a characteristic line indicating the relationship between the motor current and the motor speed when the flowing water cable 40 is clogged with foreign matter. A characteristic line L3 is a characteristic line indicating a relationship between the motor current and the motor speed when the impeller unit 22 has an abnormality. The abnormality of the impeller section 22 is, for example, wear of the impeller section 22 or the like.

  When the motor current is equal to or less than the first current value (I1 in FIG. 3), the characteristic lines L1 to L3 have substantially the same characteristics. The first current value (I1 in FIG. 3) is a minimum value of the motor current required for the pump device 1 to pump water and discharge water from the discharge port of the flowing water cable 40 in a normal state. When the motor current is larger than the first current value (I1 in FIG. 3) and equal to or smaller than the second current value (I2 in FIG. 3), the characteristic lines L2 and L3 have substantially the same characteristics. The second current value (I2 in FIG. 3) is the minimum motor current required for the pump device 1 to pump water and discharge water from the discharge port of the flowing water cable 40 when the impeller unit 22 has an abnormality. Value.

  In the characteristic lines L1 and L3, after the water is discharged from the discharge port of the flowing water cable 40, even if the motor current is increased, the rotation speed of the motor does not increase so much. However, when there is an abnormality in the impeller section 22, the load on the impeller section 22 is larger than that in the normal state, so that the minimum value of the motor current required for water to be discharged from the discharge port of the flowing water cable 40 is It becomes larger than normal. On the other hand, in the characteristic line L2, since the flowing water cable 40 is blocked and water is not discharged from the discharge port of the flowing water cable 40, the amount of change in the number of rotations of the motor with respect to the amount of change in the motor current is substantially constant.

  Therefore, the determination unit 34c can determine the presence or absence and the type of the abnormality based on the motor rotation speed when the motor current is a predetermined value larger than the second current value (I2 in FIG. 3), for example. In this case, each of the first index and the second index is a motor rotation speed when the motor current is a predetermined value larger than the second current value (I2 in FIG. 3).

<4. Modification>
A first modification of the pump device 1 according to the exemplary embodiment of the present invention will be described. The description of the same parts as those in the above-described embodiment will be omitted.

  The configuration of the detection unit 33 is different between the first modified example and the above-described embodiment. In the first modification, the detection unit 33 detects a motor current supplied to the motor 21 and a motor voltage applied to the motor 21, and outputs a motor current signal and a motor voltage signal as the detection signals. In the first modification, the detection unit 33 includes a current measurement circuit configured using a shunt resistor and a voltage measurement circuit configured using a voltage dividing resistor.

  In the first modified example, the storage unit 34a stores information on a relationship between a motor current and a motor power consumption in a normal state.

  In the first modified example, the comparison unit 34b includes information relating to a relationship between the motor current and the motor power consumption based on the detection signal output from the detection unit 33 and the motor current and the motor consumption based on the information stored in the storage unit 34a. Compare with information about the relationship between power. The comparison unit 34b calculates the power consumption of the motor 21 based on the motor current signal and the motor voltage signal output from the detection unit 33. Since the power consumption of the motor 21 substantially matches the output power of the drive circuit unit 31, the comparison unit 34b calculates the output power of the drive circuit unit 31 based on the motor current signal and the motor voltage signal output from the detection unit 33. Then, the output power of the drive circuit unit 31 is regarded as the power consumption of the motor 21.

  FIG. 4 is a graph showing the relationship between motor current and motor power consumption. A characteristic line L11 is a characteristic line indicating a relationship between the motor current and the motor power consumption in a normal state. A characteristic line L12 is a characteristic line indicating a relationship between the motor current and the motor power consumption when the flowing water cable 40 is clogged with foreign matter. A characteristic line L13 is a characteristic line showing a relationship between the motor current and the motor power consumption when the impeller unit 22 has an abnormality.

  When the flowing water cable 40 is clogged with foreign matter, the water pressure inside the pump unit 20 is close to zero, so that the load on the motor 21 is close to no load. Therefore, when the flowing water cable 40 is clogged with foreign matter, the motor voltage applied to the motor 21 to which a certain motor current (for example, I3 in FIG. 4) is energized becomes smaller than in the normal state. As a result, when the flowing water cable 40 is clogged with foreign matter, the power consumption of the motor 21 to which a certain motor current (for example, I3 in FIG. 4) is conducting becomes smaller than that in the normal state. On the other hand, when there is an abnormality in the impeller portion 22, the shape of the blades of the impeller portion 22 becomes distorted, and the load on the motor 21 increases. Therefore, when there is an abnormality in the impeller section 22, the motor voltage applied to the motor 21 to which a certain motor current (for example, I3 in FIG. 4) is energized becomes larger than in the normal state. As a result, when there is an abnormality in the impeller section 22, the power consumption of the motor 21 to which a certain motor current (for example, I3 in FIG. 4) is energized becomes larger than in the normal state.

  In the first modification, the determination unit 34c performs the determination using the inclination of the characteristic lines L11 to L13. Therefore, in the first modified example, each of the first index and the second index is a change in motor power consumption with respect to a change in motor current. When the difference between the first index and the second index is outside the predetermined range and the first index is larger than the second index, the determination unit 34c determines that the impeller unit 22 has an abnormality. On the other hand, when the difference between the first index and the second index is out of the predetermined range and the first index is smaller than the second index, the determination unit 34c determines that the flowing water cable 40 is clogged. I do.

  Next, a second modification of the pump device 1 according to the exemplary embodiment of the present invention will be described. The description of the same parts as those in the above-described embodiment will be omitted. FIG. 5 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, the detection unit 37 is installed inside the control device 30. The detection unit 37 detects a DC voltage (solar voltage) supplied from the power supply unit 10 which is a solar power generation device to the pump device 1 and a DC current (solar current) supplied from the power supply unit 10 to the pump device 1. I do.

  In the second modification, the storage unit 34a stores information on the relationship between the motor current and the solar power in a normal state. The solar power is DC power (product of solar voltage and solar current) supplied from the power supply unit 10 to the pump device 1.

  In the second modified example, the comparison unit 34b includes a motor current solar based on information on a relationship between a motor current and solar power based on each detection signal output from the detection units 33 and 37 and information stored in the storage unit 34a. Compare with information about the relationship between power. The comparison unit 34b calculates solar power based on the solar current signal and the solar voltage signal output from the detection unit 37.

  FIG. 6 is a graph showing the relationship between the motor current and the solar power. A characteristic line L21 is a characteristic line indicating a relationship between the motor current and the solar power in a normal state. A characteristic line L22 is a characteristic line showing a relationship between the motor current and the solar power when the flowing water cable 40 is clogged with foreign matter. A characteristic line L23 is a characteristic line indicating a relationship between the motor current and the solar power when the impeller unit 22 has an abnormality.

  The DC power, that is, solar power, supplied from the DC power supply unit 10 to the control device 30 is proportional to the cube of the rotation speed of the motor 21. Therefore, the relationship between the characteristic lines L21 and L22 shown in FIG. 6 is similar to the relationship between the characteristic lines L1 and L2 shown in FIG. 3, and the relationship between the characteristic lines L21 and L23 shown in FIG. Is the same as the relationship between the characteristic lines L1 and L3 shown in FIG. Therefore, the determination unit 34c can determine the presence or absence and the type of the abnormality based on the solar power when the motor current is a predetermined value larger than the second current value (I2 in FIG. 6), for example. In this case, each of the first index and the second index is solar power when the motor current is a predetermined value larger than the second current value (I2 in FIG. 6).

  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. For example, 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. It may be configured to be installed. Similarly, the configuration shown in FIG. 5 may be modified so that the detection unit 33 is installed inside the drive circuit unit 31. The configuration shown in FIG. It may be configured to be installed in In a configuration in which the detection unit 33 is installed inside the pump unit 20, the detection unit 33 may be installed inside the motor 21. 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, 37 ... detection unit, 34 ... abnormality detection unit, 34a ... storage unit, 34b ... comparison unit, 34c ... discrimination unit, 35 ... notification unit , 36 protection part, 40 flowing water cable, 41 water tank

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;
An abnormality detector;
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 abnormality detection unit,
A storage unit for storing information on the load of the motor in a normal state,
Information about the load of the motor based on the physical quantity detected by the detection unit, and a comparison unit that compares information stored in the storage unit,
A determination unit configured to determine the presence / absence and type of abnormality based on a comparison result of the comparison unit;
A pump device. The storage unit stores information on a relationship between two types of physical quantities,
The comparison unit compares information on a relationship between two types of physical quantities based on a detection signal output from the detection unit and information on a relationship between two types of physical quantities based on information stored in the storage unit. The pump device according to claim 1. The determination unit includes:
A difference between a first index indicating a relationship between two types of physical quantities based on the detection signal and a second index indicating a relationship between two types of physical quantities based on information stored in the storage unit is within a predetermined range. Is determined to be normal if
The pump device according to claim 2, wherein when the difference is outside the predetermined range, the pump device is determined to be abnormal. The pump unit has an impeller that rotates by driving the motor,
The pump device has a pipe connected to the pump unit,
The information on the relationship between the two types of physical quantities based on the detection signal is information on the relationship between the motor current supplied to the motor and the rotation speed of the motor,
The first index is the rotation speed when the motor current is a predetermined value,
The information stored by the storage unit is information on a relationship between the motor current and the rotation speed,
The second index is the rotation speed when the motor current is a predetermined value,
The determination unit includes:
If the difference between the first index and the second index is outside the predetermined range, and the first index is larger than the second index, it is determined that the pipe is clogged,
If the difference between the first index and the second index is outside the predetermined range, and the first index is smaller than the second index, it is determined that the impeller is abnormal. The pump device according to claim 3. The pump unit has an impeller that rotates by driving the motor,
The pump device has a pipe connected to the pump unit,
The physical quantity detected by the detection unit is a physical quantity related to a motor current supplied to the motor and power consumption of the motor,
The first index is a change amount of power consumption of the motor with respect to a change amount of the motor current,
The information stored by the storage unit is information on a relationship between the motor current and power consumption of the motor,
The second index is a change amount of power consumption of the motor with respect to a change amount of the motor current,
The determination unit includes:
When the difference between the first index and the second index is out of the predetermined range, and the first index is larger than the second index, it is determined that the impeller is abnormal,
If the difference between the first index and the second index is outside the predetermined range, and the first index is smaller than the second index, it is determined that the pipe is clogged, The pump device according to claim 3. The pump unit has an impeller that rotates by driving the motor,
The pump device has a pipe connected to the pump unit,
The pump device is supplied with power from a solar power generation device,
The physical quantity detected by the detection unit is a physical quantity related to a motor current supplied to the motor and power of the photovoltaic power generation device,
The first index is the power of the photovoltaic power generator when the motor current is a predetermined value,
The information stored by the storage unit is information regarding a relationship between the motor current and the power of the photovoltaic power generator,
The second index is a change amount of the power of the photovoltaic power generator with respect to the change amount of the motor current,
The determination unit includes:
If the difference between the first index and the second index is outside the predetermined range, and the first index is larger than the second index, it is determined that the pipe is clogged,
If the difference between the first index and the second index is outside the predetermined range, and the first index is smaller than the second index, it is determined that the impeller is abnormal. The pump device according to claim 3.   The pump device according to claim 4, wherein the predetermined value is larger than a minimum value of the motor current required for discharging water from a discharge port of the pipe when the impeller has an abnormality.   The pump device according to claim 4, wherein the comparison unit calculates the rotation speed based on a waveform of the motor current detected by the detection unit.   The pump device according to any one of claims 1 to 8, further comprising: a notification unit that notifies the type of the abnormality determined by the determination unit when the determination unit determines that there is an abnormality.   The pump device according to any one of claims 1 to 9, further comprising a protection unit that stops driving of the motor when the determination unit determines that there is an abnormality. A pump unit having a motor, and a drive circuit unit for energizing the motor, a control method of a pump device having a,
A first step of storing information on a load of the motor in a normal state;
A second step of detecting a physical quantity related to the load of the motor;
A third step of comparing information on the motor load based on the detected physical quantity with stored information on the motor load;
A fourth step of determining the presence / absence and type of abnormality based on the comparison result;
A control method comprising:

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