JP7634749B2 - Pump equipment and electric motor - Google Patents

Description

The present invention relates to a pump device and an electric motor used in the pump device.

Water supply systems including pump devices are known as devices that are installed in buildings such as apartment complexes and office buildings and supply water to each water supply end. Pump devices used in such water supply systems generally use electric motors as their power source. In addition, electric motors used in such pump devices are known to be equipped with inverters to vary their rotation speed.

In addition, various operational abnormalities may occur during use of the pump device. For this reason, some pump devices are equipped with a vibration sensor (acceleration pickup) at a specified position on the outside of the pump device to detect such operational abnormalities (see, for example, Patent Document 1).

JP 2007-010415 A

By using a vibration sensor such as that described in Patent Document 1, it is possible to detect vibrations caused by operational abnormalities in the pump device. However, when the vibration sensor is attached to the outside of the pump device as in Patent Document 1, the vibration value that can be detected changes depending on how the sensor is attached, making it difficult to accurately and stably detect vibrations caused by operational abnormalities.

In view of the above-mentioned problems, the present invention aims to provide a pump device and an electric motor in which a vibration sensor for detecting abnormalities in the pump device can be easily installed with accurate and stable detection precision.

In order to achieve the above object, the pump device 1 according to the first aspect of the present invention includes, as shown in, for example, Figs. 1 to 3, a pump 10; an electric motor 11 connected to the pump 10 by a drive shaft 21; an inverter case 32 fixed to the end of the electric motor 11 on the non-load side along the axial direction of the drive shaft 21; an inverter board 31 fixed inside the inverter case 32 for performing variable speed control of the electric motor 11; and a vibration sensor 37 mounted on the inverter board 31.

With this configuration, the vibration sensor 37 that detects vibrations occurring in the pump device 1 is mounted on the inverter board 31, so that vibrations occurring in the pump device 1 can be detected accurately and stably. Furthermore, no separate mounting work is required on the pump device 1 to install this vibration sensor 37, and there is no need to prepare separate wiring for the vibration sensor 37.

As shown in FIG. 3, the pump device 1 according to the second aspect of the present invention is the pump device 1 according to the first aspect of the present invention, in which the inverter board 31 is fixed to the inner surface of the inverter case 32 using a plurality of screws 40, and the vibration sensor 37 is mounted at a position adjacent to one of the plurality of screws 40.

With this configuration, the vibration sensor 37 can be positioned adjacent to the fixed position relative to the inverter case 32, so that the vibration sensor 37 will not detect vibrations that are different from the vibrations transmitted to the electric motor 11 caused by the components mounted on the inverter board 31, improving detection accuracy.

The pump device 1 according to the third aspect of the present invention is the pump device 1 according to the first aspect of the present invention, in which one or more power modules 41 are mounted on the inverter board 31, and the vibration sensor 37 is mounted at a position adjacent to where the one or more power modules 41 are soldered to the inverter board 31.

When configured in this manner, the vibration sensor 37 is placed adjacent to the power module 41, which is firmly soldered to the inverter board 31, and therefore does not detect vibrations that occur on the inverter board 31 and are different from the vibrations transmitted to the electric motor 11, improving detection accuracy.

As shown in FIG. 4, the pump device 1 according to the fourth aspect of the present invention is the pump device 1 according to the first to third aspects of the present invention, in which the inverter board 31 in the inverter case 32 is fixed by resin 42 that fills at least a part of the inverter case 32.

In this configuration, the inverter board 31 is fixed to the inverter case 32 by the resin 42, so that the inverter board 31 does not vibrate independently, improving the detection accuracy of the vibration sensor 37.

As shown in Figs. 2 and 3, the pump device 1 according to the fifth aspect of the present invention is the pump device 1 according to the first to fourth aspects of the present invention, in which the inverter board 31 is fixed in the inverter case 32 perpendicular to the drive shaft 21 connected to the pump 10 of the electric motor 11.

This configuration improves the detection accuracy of the vibration sensor 37, particularly with respect to vibrations perpendicular to the drive shaft 21, which frequently occur in the pump device 1.

As shown in FIG. 5, the pump device 1 according to the sixth aspect of the present invention further includes a monitoring device 50 that monitors the state of the pump device 1 based on the output value of the vibration sensor 37 in the pump device 1 according to the first to fifth aspects of the present invention. The monitoring device 50 includes a memory unit 53 that stores motor information related to the motor 11 and pump information related to the pump 10, and monitors the state of the pump device 1 based on the information stored in the memory unit 53 and the output value of the vibration sensor 37.

When configured in this manner, the monitoring device 50 can accurately determine whether or not an abnormality or a symptom of an abnormality has occurred in the pump device 1.

As shown in FIG. 5, the pump device 1 according to the seventh aspect of the present invention is the pump device 1 according to the sixth aspect of the present invention, except that the monitoring device 50 further includes a drive status acquisition unit 55 that acquires the drive status of the electric motor 11 by the inverter board 31, and monitors the status of the pump device 1 based on the information stored in the memory unit 53, the output value of the vibration sensor 37, and the drive status information of the electric motor 11 acquired by the drive status acquisition unit 55.

With this configuration, detection by the vibration sensor 37 and monitoring of the pump device 1 can be performed while taking into account the driving state, making it possible to monitor the pump device 1 based on the signal detected with high accuracy by the vibration sensor 37.

As shown in FIG. 5, the pump device 1 according to the eighth aspect of the present invention is the pump device 1 according to the seventh aspect of the present invention, in which the monitoring device 50 monitors the state of the pump device 1 when the driving state of the electric motor 11 acquired by the driving state acquisition unit 55 is in a steady state.

With this configuration, by monitoring the state of the pump device 1 when it is in a steady state, the output value of the vibration sensor 37 used for the monitoring does not include transient vibrations that may occur when the pump device 1 accelerates or decelerates. Therefore, the pump device 1 can be monitored more accurately.

The pump device 1 according to the ninth aspect of the present invention is, for example, as shown in FIG. 5, a pump device 1 according to the sixth to eighth aspects of the present invention, in which the monitoring device 50 is provided on the inverter board 31.

When configured in this manner, the monitoring device 50 is provided on the inverter board 31, so that the monitoring function of the pump device 1 can be essentially completed by the circuit configuration on the inverter board 31 alone.

The electric motor 11 according to the tenth aspect of the present invention is an electric motor 11 for driving a pump 10, as shown in, for example, FIG. 2 or FIG. 3, and includes a drive shaft 21 connected to the rotating shaft of the pump 10; an electric motor body 22 for driving the drive shaft 21; an inverter case 32 fixed to the end of the electric motor body 22 on the non-load side along the axial direction of the drive shaft 21; an inverter board 31 fixed within the inverter case 32 for performing variable speed control of the electric motor body 22; and a vibration sensor 37 mounted on the inverter board 31.

With this configuration, the vibration sensor 37 that detects vibrations occurring in the pump 10 or the electric motor 11 is mounted on the inverter board 31, so that the vibrations occurring in the pump 10 or the electric motor 11 can be detected accurately and stably. Furthermore, no special processing is required to install this vibration sensor 37, and there is no need to prepare separate wiring for the vibration sensor 37.

By being equipped with the above configuration, the pump device and electric motor of the present invention can easily install a vibration sensor for detecting abnormalities in the pump device with accurate and stable detection accuracy.

1 is a schematic diagram showing a pump device according to an embodiment of the present invention; 1 is an exploded perspective view of an electric motor according to an embodiment of the present invention; 1 is a schematic cross-sectional view showing an electric motor according to an embodiment of the present invention; 4 is another schematic cross-sectional view showing the electric motor according to the embodiment of the present invention. FIG. 1 is a partial functional block diagram of a pump device according to an embodiment of the present invention; FIG. 4 is a diagram showing an example of a frequency analysis result of the vibration sensor according to the embodiment of the present invention. 11A and 11B are diagrams illustrating another example of a frequency analysis result of the vibration sensor according to the embodiment of the present invention.

Each embodiment of the present invention will be described below with reference to the drawings. Note that the scope of the description necessary for achieving the object of the present invention will be shown in a schematic manner, and the description will be focused on the scope of the description necessary for the relevant parts of the present invention. Any parts that are omitted from the description will be based on publicly known technology.

Figure 1 is a schematic diagram showing a pump device 1 according to one embodiment of the present invention. As shown in Figure 1, the pump device 1 according to this embodiment includes a pump 10 and an inverter-equipped electric motor 11. This pump device 1 can be used as a part of a water supply system for supplying water to a building, etc.

As shown in FIG. 1, the pump 10 can be, for example, a well-known horizontal shaft single-stage pump, and is used to supply water to buildings, etc. The pump 10 has a rotating shaft for rotating an internal impeller, and this rotating shaft is connected to a drive shaft 21 of the electric motor 11, which will be described later, via a coupling 12. In this embodiment, a horizontal shaft single-stage pump is shown as an example of the type of pump, but this is not limited to this, and for example, a vertical shaft multi-stage pump or an underwater pump can also be used. In addition, the pump device 1 shown in FIG. 1 connects the pump 10 and the electric motor 11 with a coupling 12, but the pump device can also be one in which the drive shaft 21 of the electric motor 11 and the rotating shaft of the pump 10 are configured as a single shaft in common.

Figure 2 is an exploded perspective view of an electric motor according to an embodiment of the present invention. Also, Figure 3 is a schematic cross-sectional view of an electric motor according to an embodiment of the present invention. As shown in Figures 2 and 3, the electric motor 11 according to this embodiment is an inverter-integrated motor, and includes a drive shaft 21, an electric motor body 22 that drives the drive shaft 21, and an inverter section 23 provided at the end of the electric motor body 22 on the anti-load side. In the electric motor 11 according to this embodiment, the side on which the pump 1 is provided is called the load side, and the side opposite the load side is called the anti-load side.

The drive shaft 21 extends through the center of the motor body 22 and the inverter section 23, and its load side end is connected to the rotating shaft of the pump 10 via a coupling 12. A cooling fan 24 for cooling the motor 11 is attached to the non-load side end of the drive shaft 21. A part of the cooling fan 24 is covered by a fan cover 25 fixed to the inverter section 23.

The electric motor body 22 mainly includes a rotor 26 fixed to the drive shaft 21, a stator 27 arranged around the rotor 26, and a motor case 28 that houses the rotor 26 and the stator 27. The drive shaft 21 is rotatably supported relative to the motor case 28 by two bearings 29, 30 fixed to the motor case 28.

The inverter section 23 mainly includes an inverter board 31 and an inverter case 32 that houses the inverter board 31. Of these, the inverter case 32 is composed of an approximately disk-shaped inverter heat sink 32A and an approximately cylindrical inverter cover 32B that is fixed so as to stand on the load side from the outer edge of the inverter heat sink 32A. The inverter cover 32B fixed to the inverter heat sink 32A has its load side end face integrally fixed to the end face of the anti-load side of the motor case 28, and a cylindrical wall 33 that communicates the end of the anti-load side of the drive shaft 21 is attached to the center of the inverter heat sink 32A. In addition, the above-mentioned cooling fan 24 is arranged on the anti-load side of the inverter heat sink 32A, and the fan cover 25 is fixed thereto. Furthermore, in order to efficiently cool the electric motor 11 by the cooling fan 24, in addition to the surface of the inverter heat sink 32A, fins 34 are provided at various locations on the surfaces of the inverter cover 32B and the motor case 28, and as a result, the inverter case 32 and the motor case 28 function as a heat sink as a whole. In addition, FIG. 2 illustrates a structure in which the inverter cover 32B and the inverter heat sink 32A are separate, but the inverter cover 32B and the inverter heat sink 32A may be integrated.

The inverter board 31 is a circuit board on which various electronic components are mounted and on which an electric circuit is formed, and is used to control the speed of the electric motor 11. Examples of electronic components mounted on the inverter board 31 include one or more capacitors 35, one or more transformers 36, and a vibration sensor 37, which will be described later. In FIG. 3, all electronic components other than those shown are collectively shown as electronic components 38, and their detailed shapes, etc. are not shown.

The inverter board 31 has screw holes 39 at appropriate locations. The inverter board 31 is fixed to the inverter heat sink 32A by inserting screws 40 into the screw holes 39 and screwing them into the inverter heat sink 32A. In this embodiment, the inverter board 31 is fixed to the inner wall surface of the inverter heat sink 32A as shown in FIG. 3. In this embodiment, a power module 41 for controlling the supply of power to the inverter board 31 is disposed in the space between the inverter board 31 and the inverter heat sink 32A.

However, it is known that in a pump device 1 having such a configuration, when an abnormality occurs, vibrations different from normal occur. Examples of abnormalities that occur in a pump device used in a water supply device such as the pump device 1 according to this embodiment include cavitation, or failure of the bearings of the pump or the electric motor. In the pump device 1 of this embodiment, for example, if one of the bearings 29 of the electric motor 11 fails, the drive shaft 21 cannot rotate stably due to the failure of this bearing 29, and as a result, large vibrations are transmitted to the motor case 28 and the inverter case 32 fixed to the motor case 28. Similarly, in the pump 10 of the pump device 1 of this embodiment, for example, if cavitation occurs, the vibrations generated by the cavitation are first transmitted to the impeller or casing of the pump 10, and then transmitted to the rotating shaft, coupling 12, and drive shaft 21 of the pump 10, and the vibrations are transmitted to the entire electric motor 11 including the motor case 28 and the inverter case 32 fixed to the motor case 28.

The inventors focused on the transmission path of vibrations caused by such abnormalities and arrived at the present invention. In other words, in the case of any of the illustrated abnormalities, the vibrations caused by the abnormality are transmitted to the electric motor 11, and therefore the inventors came to the realization that if the vibrations transmitted to the electric motor 11 can be accurately detected, the abnormality occurring in the pump device 1 can be accurately detected, which led to the present invention. Specifically, a configuration is adopted in which a vibration sensor 37 is mounted on the inverter board 31 of the electric motor 11 in this embodiment.

The vibration sensor 37 mounted on the inverter board 31 is for detecting vibrations caused by abnormalities occurring in the pump device 1, and a sensor capable of detecting three-dimensional vibrations can be adopted. As a vibration sensor for detecting each vibration in three-dimensional directions, for example, a well-known three-axis acceleration sensor can be adopted. Vibrations caused by abnormalities occurring in the pump 10 (e.g., occurrence of cavitation or failure of the bearings of the pump 10) transmitted to the electric motor 11 via the coupling 12, or vibrations caused by abnormalities occurring in the electric motor 11 itself (e.g., failure of the bearings 29, 30) are transmitted in the order of the motor case 28 of the electric motor 11, the inverter cover 32B or the cylindrical wall 33 fixed to the motor case 28, the inverter heat sink 32A, and the inverter board 31 fixed to the inverter heat sink 32A with screws 40, and are detected by the vibration sensor 37 mounted on the inverter board 31. The presence or absence of an abnormality in the pump device 1 is determined or estimated based on the vibrations detected here.

Here, it is important to note that the vibration sensor 37 of the present invention is positioned adjacent to the screw 40 and/or the power module 41. When the vibration sensor 37 is positioned in such a position, the screw 40 is fixed to the inverter case 32, and the power module 41 (IGBT, power MOSFET, etc.) is generally fixed to the heat sink 32A with a screw and is firmly soldered to the board. Therefore, when the vibration sensor 37 detects the vibration transmitted to the inverter board 31, the vibration of the inverter board 31 itself caused by the capacitor 35 mounted on the inverter board 31 is unlikely to be mixed into the detection result. Note that "adjacent" here refers to being arranged in a position close to the vibration sensor 37 and the screw 40 or power module 41 without any other electronic components being interposed between them. Therefore, in this embodiment, as shown in Figures 2 and 3, the vibration sensor 37 is arranged adjacent only to the screw 40. However, the present invention is not limited to this, and the vibration sensor 37 may be arranged adjacent to the power module 41 or adjacent to both the screw 40 and the power module 41.

Figure 4 is another schematic cross-sectional view showing an electric motor according to an embodiment of the present invention. As described above, it is important to ensure the accuracy of the detection result that other vibrations, specifically the vibration of the inverter board 31 itself, are not mixed into the detection result of the vibration sensor 37. Therefore, as another method for preventing other vibrations that may become noise from being mixed into the detection result of the vibration sensor 37, as shown in Figure 4, a resin (molding resin) 42 may be filled in a part of the anti-load side in the inverter case 32 to mold and fix the inverter board 31 to the inverter case 32. By resin-molding the entire inverter board 31 in this way, it is possible to prevent the inverter board 31 from vibrating by itself. In this case, in addition to suppressing the above-mentioned noise from being mixed in, the mounting position of the vibration sensor 37 is no longer restricted, so the degree of freedom in the layout of the inverter board 31 is improved.

As shown in this embodiment, fixing the inverter board 31 to the inverter case 32 so as to be perpendicular to the drive shaft 21 is preferable from the viewpoint of maintaining the detection accuracy of the vibration sensor 37 mounted on the inverter board 31. Vibrations occurring in the pump device 1 generally tend to occur in the rotational direction of the drive shaft 21 (direction perpendicular to the drive shaft 21) rather than in the extension direction of the drive shaft 21. On the other hand, vibrations caused by deflection occurring in the inverter board 31 tend to occur easily in the extension direction (axial direction) of the drive shaft 21. Therefore, according to the fixing method of the inverter board 31 of the present invention, the influence of the vibration of the inverter board 31 itself on the vibration component in the rotational direction of the drive shaft 21 is reduced, and vibrations occurring in the pump device 1 can be detected with high accuracy.

As described above, in the pump device 1 and electric motor 11 according to this embodiment, the vibration sensor 37 for detecting abnormalities in the pump device 1 is mounted on the inverter board 31, which eliminates the need to install the vibration sensor 37 for each pump device 1, and makes it possible to stably and accurately detect vibrations occurring in the pump device 1. In addition, by mounting the vibration sensor 37 on the inverter board 31, it is no longer necessary to provide a dedicated signal line that would have been necessary if the vibration sensor 37 had been mounted on the outer wall of the pump 10 or electric motor 11, or on each bearing portion, etc., and it becomes possible to detect vibrations in the pump device 1 with a simple configuration.

However, according to the above-mentioned configuration, it is possible for the vibration sensor 37 to accurately detect vibrations occurring in the pump device 1, but depending on the specific method of using the detection results, it is not possible to accurately detect abnormalities in the pump device 1. In particular, when attempting to detect signs of abnormality in addition to when an abnormality actually occurs, the method of use is particularly important. Therefore, another object of the present invention is to provide a pump device and an electric motor that can use the detection results detected by the vibration sensor 37 to monitor for the presence or absence of abnormalities or signs of abnormality (hereinafter, these will be collectively referred to simply as "abnormalities"). The configuration for achieving this other object is described below.

Figure 5 is a partial functional block diagram of a pump device according to one embodiment of the present invention. In the pump device 1 according to this embodiment, the inverter board 31 further includes a monitoring device 50 in addition to the vibration sensor 37 described above.

The monitoring device 50 is a device for monitoring whether there is an abnormality in the pump device 1. This monitoring device 50 includes at least a detection result acquisition unit 51, a calculation unit 52, a storage unit 53, and an interface 54. Each of these components can communicate with each other via an internal bus within the monitoring device 50.

The detection result acquisition unit 51 is connected to the vibration sensor 37, acquires the detection result of the vibration sensor 37, and transfers the detection result data to the calculation unit 52 or memory unit 53 described below.

The calculation unit 52 is mainly composed of an arithmetic device such as a microcomputer, and performs frequency analysis on the detection result data acquired by the detection result acquisition unit 51. The calculation unit 52 may also determine whether or not there is an abnormality in the pump device 1 based on the results of the frequency analysis as necessary. Well-known methods can be used as the frequency analysis method. For example, by observing the frequency distribution contained in the results of a fast Fourier transform (FFT) of the raw data of the detection results, it is possible to identify the cause of vibration, and determine whether or not there is an abnormality.

The memory unit 53 is composed of a well-known storage medium such as a volatile or non-volatile memory, and is capable of storing programs for operating the calculation unit 52 and various information necessary for calculations in the calculation unit 52. The memory unit 53 also stores motor information related to the electric motor 11 (e.g., the number of poles, the number of bearing balls, the number of blades of the cooling fan 24, etc.) and pump information related to the pump 10 (e.g., the number of impeller blades, the number of bearing balls, etc.). This information is used by the calculation unit 52 when determining whether there is an abnormality in the pump device 1.

The interface 54 is for inputting and outputting information to and from the monitoring device 50. Various configurations can be adopted for this interface 54, but in this embodiment, an interface that at least includes a communication means using short-range wireless communication such as infrared communication, Bluetooth (registered trademark), and NFC and realizes two-way communication with an external device, for example, a mobile communication terminal 13 such as a smartphone, tablet terminal, or mobile PC, is adopted. This makes it possible to transmit, for example, the frequency analysis results calculated by the calculation unit 52 and the results of determining whether or not there is an abnormality to the mobile communication terminal 13, and to receive various requests from the mobile communication terminal 13. Note that the interface 54 is not limited to the above-mentioned configuration, and can also be a combination of an input interface such as a keyboard or a pointing device and an output interface such as a monitor or a speaker. The external device is also not limited to the above-mentioned mobile communication terminal 13, and can be, for example, a management server connected to a network line.

In addition to the above-mentioned configuration, the monitoring device 50 according to this embodiment further includes a drive state acquisition unit 55 for acquiring the drive state of the electric motor 11. As shown in FIG. 5, the drive state acquisition unit 55 acquires a control signal of the inverter device 31A, which is composed of an inverter circuit formed on the inverter board 31 and a capacitor 35 mounted on the inverter board 31, to identify the drive state including the operating frequency of the electric motor 11. Then, when performing frequency analysis in the calculation unit 52, the monitoring device 50 uses the drive state information of the electric motor 11 acquired by the drive state acquisition unit 55 to perform frequency analysis based on the operating frequency of the electric motor 1, thereby achieving high analysis accuracy.

With the above-mentioned configuration, the monitoring device 50 can monitor the pump device 1. To explain an example of a specific method of monitoring by the monitoring device 50, first, the detection results of the vibration sensor 37 when no abnormality occurs in the pump device 1 are obtained multiple times in advance. Then, in the calculation unit 52, frequency analysis is performed based on the detection results and the motor information and pump information stored in the memory unit 52, and the analysis results at various timings when no abnormality occurs in the pump device 1 are learned and stored (for example, using a well-known machine learning method). Then, the pump device 1 is operated normally, the detection results of the vibration sensor 37 are sequentially obtained, and the calculation unit 52 similarly performs frequency analysis. Then, the result of the frequency analysis is compared with the analysis result when no abnormality occurs in the pump device 1 that has been stored in advance, and the presence or absence of an abnormality is identified by identifying the change.

Figure 6 is a diagram showing an example of a frequency analysis result of a vibration sensor according to an embodiment of the present invention. In Figure 6, the graph of the analysis result indicated by the symbol D1 is an analysis result at an arbitrary timing when no abnormality occurs in the pump device 1, which is stored in advance in the memory unit 53, and the graph of the analysis result indicated by the symbol D2 is an analysis result at the same timing when an abnormality occurs in the pump device 1. In the example of Figure 6, it can be seen that the distribution of vibration (amplitude) levels at each frequency in the graphs of both analysis results D1 and D2 is relatively shifted horizontally. By identifying such a change in the analysis result, the calculation unit 52 can identify that an abnormality has occurred in the pump device 1.

Also, FIG. 7 is a diagram showing another example of the frequency analysis result of the vibration sensor according to one embodiment of the present invention. In FIG. 7, the graph of the analysis result indicated by the symbol D3 is the analysis result at an arbitrary timing (different from the timing shown in FIG. 6) when no abnormality occurs in the pump device 1, which is stored in advance in the storage unit 53, and the graph of the analysis result indicated by the symbol D4 is the analysis result at the same timing when an abnormality occurs in the pump device 1. In the example of FIG. 7, it can be seen that the vibration level is greater in the analysis result D4 than in the analysis result D3 at a specific frequency. The calculation unit 52 can identify the occurrence of an abnormality in the pump device 1 by identifying such a change in the analysis result. Then, the identification result in the calculation unit 52 or the analysis result shown in FIG. 6 or FIG. 7 is transmitted to the mobile communication terminal 13 using the interface 54, making it possible to notify the occurrence of an abnormality to the user or the like who manages the pump device 1.

The method of identifying an abnormality based on the detection result of the vibration sensor 37 is not limited to the above-mentioned method. For example, it is also possible to identify that an abnormality has occurred simply when the level of vibration detected by the vibration sensor 37 becomes greater than or equal to a threshold value previously set based on pump information, motor information, etc. The vibration level may be an overall value (OA value) resulting from frequency analysis of the measured vibration data, or a vibration level of a previously set frequency. In addition to identifying an abnormality using the above-mentioned method, the location where the abnormality has occurred can also be identified or estimated by taking into account the frequency analysis result of the vibration sensor, the operating frequency of the inverter, and the pump information and motor information stored in the memory unit 53, etc.

The vibration sensor 37 according to this embodiment can detect vibrations occurring in the pump device 1 with high accuracy as described above, but the detection results are not always suitable for monitoring abnormalities. In detail, when the motor 11 accelerates or decelerates, transient vibrations are likely to occur in the pump device 1, and the rotation frequency of the motor 11 fluctuates during acceleration and deceleration, so the detection results of the vibration sensor 37 at this time are not very suitable as data for determining whether an abnormality has occurred. Therefore, the monitoring device 50 in this embodiment further specifies whether the motor 11 is in an accelerating/decelerating state or a steady state from the driving state acquired by the driving state acquisition unit 55, and performs vibration detection by the vibration sensor 37 only when the motor 11 is in a steady state. By controlling the vibration detection timing in this manner, the monitoring device 50 can always achieve highly accurate abnormality monitoring.

In addition, when the monitoring device 50 is provided on the inverter board 31 as in this embodiment, it is possible to realize the entire series of monitoring processes on the inverter board 31, and it is possible to provide an electric motor that realizes an abnormality monitoring function on its own. In particular, the inverter board 31 is particularly advantageous in that it can easily realize control such as detecting an abnormality only when the electric motor 11 is in a specific driving state, which was difficult to achieve when a means for detecting an abnormality was prepared separately from the pump device 1, by providing not only variable speed control but also an abnormality detection function using vibration. However, the monitoring device 50 does not necessarily have to be provided on the inverter board 31, and may be disposed at a predetermined position within the inverter case 32, or the main function of the monitoring device 50 may be installed on the mobile communication terminal 13, and the inverter board 31 may be provided with only a communication function for transmitting the detection results of the vibration sensor 37 and the driving state of the electric motor 11, etc.

As described above, by adopting the above-mentioned monitoring device 50 to the electric motor 11 of the pump device 1, it is possible to monitor abnormalities in the pump device 1 using the detection results of the vibration sensor 37.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. All such modifications are included in the technical concept of the present invention.

REFERENCE SIGNS LIST 1 Pump device 10 Pump 11 Inverter-integrated motor 12 Coupling 13 Portable communication terminal 21 Drive shaft 22 Motor body 23 Inverter unit 24 Cooling fan 25 Fan cover 26 Rotor 27 Stator 28 Motor case 29, 30 Bearing 31 Inverter board 31A Inverter device 32 Inverter case 32A Inverter heat sink 32B Inverter cover 33 Cylindrical wall 34 Fin 35 Capacitor 36 Power transformer 37 Vibration sensor 38 Electronic component 39 Screw hole 40 Screw 41 Power module 42 Resin 50 Monitoring device 51 Detection result acquisition unit 52 Calculation unit 53 Memory unit 54 Interface 55 Drive state acquisition unit

Claims (10)

A pump;
an electric motor connected to the pump by a drive shaft;
an inverter case fixed to an end of the motor on the opposite side to the load side along the axial direction of the drive shaft;
an inverter board for performing variable speed control of the motor, the inverter board being fixed in the inverter case such that one surface of the inverter board faces an end of the motor on the opposite load side;
a vibration sensor mounted on a surface of the inverter board facing an end portion of the motor on the opposite load side, the vibration sensor detecting vibrations generated in at least one of the pump and the motor;
the inverter board is fixed to the inner surface of the inverter case by a plurality of screws, and the vibration sensor is mounted at a position adjacent to any one of the plurality of screws.
Pump equipment. A pump;
an electric motor connected to the pump by a drive shaft;
an inverter case fixed to an end of the motor on a counter-load side along the axial direction of the drive shaft;
an inverter board for performing variable speed control of the motor, the inverter board being fixed in the inverter case such that one surface of the inverter board faces an end of the motor on the opposite load side;
a vibration sensor mounted on a surface of the inverter board facing an end portion of the motor on the opposite load side, the vibration sensor detecting vibrations generated in at least one of the pump and the motor;
one or more power modules are mounted on the inverter board, and the vibration sensor is mounted at a position adjacent to the one or more power modules.
Pump equipment. The inverter board in the inverter case is fixed by a resin that fills at least a part of the inverter case.
The pump device according to claim 1 or 2. The inverter board is fixed in the inverter case perpendicular to the drive shaft connected to the pump of the electric motor.
A pump device according to any one of claims 1 to 3. a monitoring device that monitors a state of the pump device based on an output value of the vibration sensor,
The monitoring device includes a storage unit that stores motor information related to the motor and pump information related to the pump, and monitors a state of the pump device based on the information stored in the storage unit and an output value of the vibration sensor.
A pump device according to any one of claims 1 to 4. The monitoring device further includes a drive status acquisition unit that acquires a drive status of the electric motor by the inverter board, and monitors a state of the pump device based on each piece of information stored in the storage unit, an output value of the vibration sensor, and drive status information of the electric motor acquired by the drive status acquisition unit.
6. The pump device according to claim 5. the monitoring device monitors the state of the pump device when the drive state of the electric motor acquired by the drive state acquisition unit is in a steady state.
7. The pump device according to claim 6. The monitoring device is provided on the inverter board.
A pump device according to any one of claims 5 to 7. An electric motor for driving a pump,
A drive shaft connected to a rotating shaft of the pump;
An electric motor body that drives the drive shaft;
an inverter case fixed to an end of the motor body on the opposite load side along the axial direction of the drive shaft;
an inverter board for performing variable speed control of the motor body, the inverter board being fixed in the inverter case such that one surface of the inverter board faces an end portion of the motor body on the opposite load side;
a vibration sensor mounted on a surface of the inverter board facing an end portion of the motor body on the opposite load side, the vibration sensor detecting vibrations generated in at least one of the pump and the motor;
the inverter board is fixed to the inner surface of the inverter case by a plurality of screws, and the vibration sensor is mounted at a position adjacent to any one of the plurality of screws.
Electric motor. An electric motor for driving a pump,
A drive shaft connected to a rotating shaft of the pump;
An electric motor body that drives the drive shaft;
an inverter case fixed to an end of the motor body on the opposite load side along the axial direction of the drive shaft;
an inverter board for performing variable speed control of the motor body, the inverter board being fixed in the inverter case such that one surface of the inverter board faces an end portion of the motor body on the opposite load side;
a vibration sensor mounted on a surface of the inverter board facing an end portion of the motor body on the opposite load side, the vibration sensor detecting vibrations generated in at least one of the pump and the motor;
one or more power modules are mounted on the inverter board, and the vibration sensor is mounted at a position adjacent to the one or more power modules.
Electric motor.