JP2021179192A - Pump device and electric motor - Google Patents

Abstract

To provide a pump device capable of easily installing a vibration sensor for detecting abnormality of the pump device without reducing detection accuracy thereof, and an electric motor.SOLUTION: A pump device 1 comprises: a pump 10; an electric motor 11 connected to the pump 10 by a drive shaft 21; an inverter case 32 fixed along an axial direction of the drive shaft 21 to the end part of the electric motor 11 on the opposite load side; an inverter board 31 that is fixed in the inverter case 32, and performs variable speed control of the electric motor 11; and a vibration sensor 37 mounted on the inverter board 31.SELECTED DRAWING: Figure 3

Description

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

A water supply device including a pump device is known as a device installed in a building such as an apartment house or an office building and supplying water to each water supply end. In the pump device used for such a water supply device, an electric motor is generally adopted as a power source thereof. In addition, as an electric motor used in such a pump device, one provided with an inverter for varying the rotation speed is known.

In addition, the pump device may cause various malfunctions due to its use. Therefore, there is a device in which a vibration sensor (acceleration pickup) for detecting such an operation abnormality is provided at a predetermined position on the outside of the pump device (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2007-010415

By using a vibration sensor as described in Patent Document 1, it is possible to detect vibration caused by an operation abnormality of the pump device. However, when the vibration sensor is attached to the outside of the pump device as in Patent Document 1, the detectable vibration value changes depending on how it is attached, so that the vibration caused by the operation abnormality should be detected accurately and stably. Is difficult.

In view of the above-mentioned problems, it is an object of the present invention to provide a pump device and an electric motor capable of easily installing a vibration sensor for detecting an abnormality in the pump device with accurate and stable detection accuracy.

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

With this configuration, the vibration sensor 37 that detects the vibration generated in the pump device 1 is mounted on the inverter board 31, so that the vibration generated in the pump device 1 can be detected accurately and stably. Become. Further, in order to install the vibration sensor 37, it is not necessary to separately attach the pump device 1 or the like, and it is not necessary to separately prepare the wiring for the vibration sensor 37.

As shown in FIG. 3, for example, in the pump device 1 according to the first aspect of the present invention, the pump device 1 according to the second aspect of the present invention has a plurality of inverter boards 31 on the inner surface of the inverter case 32. It is fixed by using a screw 40, and the vibration sensor 37 is mounted at a position adjacent to any of the plurality of screws 40.

With this configuration, the vibration sensor 37 can be arranged adjacent to the fixed position with respect to the inverter case 32, so that the vibration sensor 37 is transmitted to the motor 11 generated by the influence of the parts mounted on the inverter board 31. It eliminates the need to detect vibrations that are different from vibrations, 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, wherein one or more power modules 41 are mounted on the inverter board 31. The vibration sensor 37 is mounted at a position adjacent to a place where the one or more power modules 41 are solder-connected to the inverter board 31.

With this configuration, the vibration sensor 37 is placed adjacent to the power module 41 that is firmly soldered to the inverter board 31, so that vibration different from the vibration transmitted to the motor 11 generated on the inverter board 31 is detected. The detection accuracy is improved.

In the pump device 1 according to the fourth aspect of the present invention, for example, as shown in FIG. 4, in the pump device 1 according to the first to third aspects of the present invention, the inverter board 31 in the inverter case 32 is , It is fixed by the resin 42 filled in at least a part of the inverter case 32.

With 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, and the detection accuracy of the vibration sensor 37 is improved.

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

With such a configuration, the detection accuracy of the vibration sensor 37 is particularly improved with respect to the vibration in the direction perpendicular to the drive shaft 21, which is frequently generated in the pump device 1.

The pump device 1 according to the sixth aspect of the present invention is, for example, as shown in FIG. 5, in the pump device 1 according to the first to fifth aspects of the present invention, based on the output value of the vibration sensor 37. A monitoring device 50 for monitoring the state of the pump device 1 is further provided, and the monitoring device 50 includes a storage unit 53 for storing electric device information regarding the electric motor 11 and pump information regarding the pump 10, and the storage unit 53 includes a storage unit 53. The state of the pump device 1 is monitored based on each stored information and the output value of the vibration sensor 37.

With this configuration, the monitoring device 50 can identify with high accuracy whether or not an abnormality or a sign of an abnormality has occurred in the pump device 1.

The pump device 1 according to the seventh aspect of the present invention is, for example, as shown in FIG. 5, in the pump device 1 according to the sixth aspect of the present invention, the monitoring device 50 is the electric motor based on the inverter board 31. The drive state acquisition unit 55 that acquires the drive state of 11 is further included, each information stored in the storage unit 53, the output value of the vibration sensor 37, and the drive state of the electric motor 11 acquired by the drive state acquisition unit 55. The state of the pump device 1 is monitored based on the information.

With this configuration, it is possible to perform detection by the vibration sensor 37 and monitoring of the pump device 1 while taking into consideration the driving state. Therefore, monitoring of the pump device 1 is performed based on the signal detected by the vibration sensor 37 with high accuracy. Can be realized.

The pump device 1 according to the eighth aspect of the present invention is, for example, as shown in FIG. 5, in the pump device 1 according to the seventh aspect of the present invention, the monitoring device 50 is the drive state acquisition unit 55. When the acquired drive state of the electric motor 11 is a steady state, the state of the pump device 1 is monitored.

With this configuration, when the pump device 1 is in a steady state, the state is monitored, and the output value of the vibration sensor 37 used for the monitoring is transient, which may occur during acceleration or deceleration of the pump device 1. Vibration is no longer included. Therefore, the monitoring of the pump device 1 can be realized more accurately.

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

With this configuration, the monitoring device 50 is provided on the inverter board 31, so that the monitoring function of the pump device 1 can be substantially completed only by the circuit configuration on the inverter board 31.

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

With this configuration, the vibration sensor 37 that detects the vibration generated in the pump 10 or the electric motor 11 is mounted on the inverter board 31, so that the vibration generated in the pump 10 or the electric motor 11 can be detected accurately and stably. Will be able to. Further, no special processing or the like is required to install the vibration sensor 37, and it is not necessary to separately prepare wiring for the vibration sensor 37.

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

It is a schematic diagram which shows the pump device which concerns on one Embodiment of this invention. It is an exploded perspective view of the electric motor which concerns on one Embodiment of this invention. It is the schematic sectional drawing which shows typically the electric motor which concerns on one Embodiment of this invention. It is another schematic sectional drawing schematically showing the electric motor which concerns on one Embodiment of this invention. It is a partial functional block diagram of the pump device which concerns on one Embodiment of this invention. It is a figure which shows an example of the frequency analysis result of the vibration sensor which concerns on one Embodiment of this invention. It is a figure which shows the other example of the frequency analysis result of the vibration sensor which concerns on one Embodiment of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following, the scope necessary for the explanation for achieving the object of the present invention will be schematically shown, and the scope necessary for the explanation of the relevant part of the present invention will be mainly explained. It shall be based on known technology.

FIG. 1 is a schematic view showing a pump device 1 according to an embodiment of the present invention. As shown in FIG. 1, the pump device 1 according to the present embodiment includes a pump 10 and an inverter built-in type electric motor 11. The pump device 1 can be used, for example, as a part of a water supply device for supplying water to a building or the like.

As shown in FIG. 1, the pump 10 can be, for example, a well-known horizontal axis single-stage pump, and is for supplying water to a building or the like. The pump 10 is provided with a rotating shaft for rotating an internal impeller, and the rotating shaft is connected to a drive shaft 21 described later of the electric motor 11 via a coupling 12. In the present embodiment, the horizontal axis single-stage pump is exemplified as the type of the pump, but the present invention is not limited to this, and for example, a vertical axis multi-stage pump, a submersible pump, or the like can be adopted. Further, in the pump device 1 shown in FIG. 1, the pump 10 and the electric motor 11 are connected by a coupling 12, but the drive shaft 21 of the electric motor 11 is configured by one shaft common to the rotation shaft of the pump 10. It can also be a pump device.

FIG. 2 is an exploded perspective view of the electric motor according to the embodiment of the present invention. Further, FIG. 3 is a schematic cross-sectional view schematically showing an electric motor according to an embodiment of the present invention. As shown in FIGS. 2 and 3, the electric motor 11 according to the present embodiment is a motor with a built-in inverter, and is a drive shaft 21, an electric motor main body 22 for driving the drive shaft 21, and a reaction of the electric motor main body 22. It includes an inverter unit 23 provided at the end on the load side. In the motor 11 according to the present embodiment, the side where the pump 1 is provided is called the load side, and the side opposite to the load side is called the non-load side.

The drive shaft 21 extends so as to penetrate the central portion of the motor body 22 and the inverter portion 23, and the end portion on the load side thereof is connected to the rotary shaft of the pump 10 via the coupling 12. Further, a cooling fan 24 for cooling the electric motor 11 is attached to the end portion of the drive shaft 21 on the opposite load side. A part of the cooling fan 24 is covered with a fan cover 25 fixed to the inverter unit 23.

The 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 accommodating the rotor 26 and the stator 27. The drive shaft 21 is rotatably supported with respect to the motor case 28 by two bearings 29 and 30 fixed to the motor case 28.

The inverter unit 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 a substantially disk-shaped inverter heat sink 32A and a substantially cylindrical inverter cover 32B fixed so as to stand upright on the load side from the outer edge portion of the inverter heat sink 32A. The load-side end face of the inverter cover 32B fixed to the inverter heat sink 32A is integrally fixed to the non-load-side end face of the motor case 28, and the drive shaft 21 is located at the center of the inverter heat sink 32A. A tubular wall 33 is attached to communicate the end on the load side. Further, the cooling fan 24 described above is arranged on the counterload side of the inverter heat sink 32A, and the fan cover 25 is fixed. Further, in order to efficiently cool the electric motor 11 by the cooling fan 24, fins 34 are provided in various places on the surfaces of the inverter cover 32B and the motor case 28 in addition to the surface of the inverter heat sink 32A, and as a result, the inverter case 32 is provided. And the motor case 28 as a whole functions as a heat sink. Although FIG. 2 illustrates a structure in which the inverter cover 32B and the inverter heat sink 32A are separated, the structure may be such that the inverter cover 32B and the inverter heat sink 32A are integrated.

The inverter board 31 is a circuit board on which various electronic components are mounted and an electric circuit is formed, and is for controlling the electric motor 11 at a variable speed. Here, examples of the electronic components mounted on the inverter board 31 include one or more capacitors 35, one or more transformers 36, and a vibration sensor 37 described later. Note that, in FIG. 3, components other than the illustrated electronic components are collectively shown as the electronic component 38, and the detailed shape and the like thereof are not shown.

Further, the inverter board 31 is provided with screw holes 39 at appropriate positions. Then, the inverter board 31 is fixed to the inverter heat sink 32A by inserting the screw 40 into the screw hole 39 and screwing it into the inverter heat sink 32A. As shown in FIG. 3, the inverter board 31 of the present embodiment is fixed to the inner wall surface of the inverter heat sink 32A. In the present embodiment, the power module 41 for controlling the supply of electric power to the inverter board 31 is arranged in the space between the inverter board 31 and the inverter heat sink 32A.

By the way, in the pump device 1 having such a configuration, it is known that vibration different from the usual one occurs when an abnormality occurs. Examples of the abnormality that occurs in the pump device used in the water supply device such as the pump device 1 according to the present embodiment include cavitation, failure of the bearing of the pump or the electric motor, and the like. In the pump device 1 of the present embodiment, for example, when one of the bearings 29 of the motor 11 fails, the drive shaft 21 cannot rotate stably due to the failure of the bearing 29, and as a result, the motor case 28 and the motor A large vibration is transmitted to the inverter case 32 fixed to the case 28. Similarly, in the pump 10 of the pump device 1 of the present embodiment, for example, when cavitation occurs, the vibration generated by the cavitation is first transmitted to the impeller or the casing of the pump 10, and then the rotation shaft and the coupling of the pump 10. Vibration is transmitted to the motor case 28 and the entire motor 11 including the inverter case 32 fixed to the motor case 28 by being transmitted to the drive shaft 21 and the drive shaft 21.

The present inventors have focused on the transmission path of vibration caused by such an abnormality, and have reached the present invention. That is, in the case of any of the above-exemplified abnormalities, the vibration generated by the abnormality is transmitted to the motor 11 portion. Therefore, if the vibration transmitted to the motor 11 can be accurately detected, the vibration is generated in the pump device 1. We have come up with the idea of being able to detect abnormalities with high accuracy, and have reached the present invention. Specifically, the configuration in which the vibration sensor 37 is mounted on the inverter board 31 of the motor 11 according to the present embodiment is adopted.

The vibration sensor 37 mounted on the inverter board 31 is for detecting the vibration caused by the abnormality generated in the pump device 1, and a sensor capable of detecting the three-dimensional vibration can be adopted. .. As a vibration sensor for detecting each vibration in the three-dimensional direction, for example, a well-known 3-axis acceleration sensor or the like can be adopted. Then, vibration due to an abnormality (for example, occurrence of cavitation or failure of the bearing of the pump 10) transmitted to the motor 11 via the coupling 12 or an abnormality generated in the motor 11 itself (for example, for example). The vibration caused by the failure of the bearings 29 and 30) was fixed to the motor case 28 of the motor 11, the inverter cover 32B fixed to the motor case 28, the tubular wall 33, the inverter heat sink 32A, and the inverter heat sink 32A with screws 40. By transmitting in the order of the inverter board 31, it is detected by the vibration sensor 37 mounted on the inverter board 31. Then, in consideration of the vibration detected here, the presence or absence of abnormality in the pump device 1 is determined or estimated.

Here, it is particularly noteworthy 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 arranged at such a position, the screw 40 is exactly fixed to the inverter case 32, and the power module 41 (IGBT, power MOSFET, etc.) is generally screw-fixed to the heat sink 32A. Since the member is firmly soldered to the board, when the vibration sensor 37 detects the vibration transmitted to the inverter board 31, the detection result is caused by the capacitor 35 or the like mounted on the inverter board 31. Vibration of the inverter board 31 itself is less likely to be mixed. The term "adjacent" as used herein means that the vibration sensor 37 and the screw 40 or the power module 41 are arranged at close positions without any other electronic components intervening. Therefore, in the present embodiment, as shown in FIGS. 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 may be arranged adjacent to the power module 41 or may be arranged adjacent to both the screw 40 and the power module 41.

FIG. 4 is another schematic cross-sectional view schematically showing an electric motor according to an embodiment of the present invention. As described above, it is important not to mix other vibrations, specifically, the vibration of the inverter board 31 itself described above with the detection result of the vibration sensor 37, in order to ensure the accuracy of the detection result. Therefore, as another method for preventing other vibrations that may be noise from being mixed in the detection result of the vibration sensor 37, as shown in FIG. 4, a resin (molded resin) 42 is partially formed on the counterload side in the inverter case 32. May be filled and the inverter board 31 may be molded and fixed 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 mixing of the above-mentioned noise, the mounting position of the vibration sensor 37 is not restricted, so that the degree of freedom in the layout of the inverter board 31 is improved.

Further, as shown in the present embodiment, fixing the inverter board 31 to the inverter case 32 so as to be perpendicular to the drive shaft 21 improves the detection accuracy of the vibration sensor 37 mounted on the inverter board 31. It is preferable from the viewpoint of maintenance. The vibration generated in the pump device 1 generally tends to occur not in the extending direction of the drive shaft 21 but in the rotation direction of the drive shaft 21 (direction perpendicular to the drive shaft 21). On the other hand, the vibration caused by the deflection of the inverter board 31 tends to occur in the extending direction (axial direction) of the drive shaft 21. Therefore, according to the method of fixing 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 rotation direction of the drive shaft 21 is reduced, and the vibration generated in the pump device 1 can be detected with high accuracy.

As described above, in the pump device 1 and the electric motor 11 according to the present embodiment, the vibration sensor 37 for detecting the abnormality of the pump device 1 is mounted on the inverter board 31. There is no need to install each pump device 1, and vibration generated in the pump device 1 can be detected stably and with high accuracy. Further, by mounting the vibration sensor 37 on the inverter board 31, for example, the dedicated signal line required when the vibration sensor 37 is attached to the outer wall of the pump 10 or the electric motor 11 or each bearing portion becomes unnecessary. , The vibration of the pump device 1 can be detected with a simple configuration.

By the way, according to the above-mentioned configuration, it is possible to accurately detect the vibration generated in the pump device 1 by the vibration sensor 37, but depending on the specific usage of the detection result, the abnormality of the pump device 1 may be detected. It cannot be detected accurately. In particular, when an abnormality is actually generated and when an attempt is made to detect a sign of the abnormality, its utilization method is particularly important. Therefore, in the present invention, the pump device and the pump device capable of monitoring the presence or absence of an abnormality or a sign of an abnormality (hereinafter, these are collectively simply referred to as “abnormality”) using the detection result detected by the vibration sensor 37. The provision of electric motors shall be included for other purposes. The configuration for achieving the other objectives will be described below.

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

The monitoring device 50 is a device for monitoring whether or not there is an abnormality in the pump device 1. The 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 in 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 the storage unit 53, which will be described later.

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

The storage unit 53 is composed of a well-known storage medium such as a volatile or non-volatile memory, and can store a program for operating the calculation unit 52 and various information necessary for calculation in the calculation unit 52. Is. Further, in the storage unit 53, motor information related to the motor 11 (for example, 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 (for example, the number of impeller blades, bearings, etc.) The number of balls, etc.) is stored. This information is used in the calculation unit 52 when determining an abnormality in the pump device 1.

The interface 54 is for inputting / outputting information and the like to the monitoring device 50. Various configurations can be adopted for this interface 54, but in the present embodiment, at least a communication means using infrared communication, Bluetooth (registered trademark), and short-range wireless communication represented by NFC is provided, and an external device is provided. A device that realizes two-way communication with a mobile communication terminal 13 such as a smartphone, a tablet terminal, or a mobile PC is adopted. As a result, for example, the frequency analysis result calculated by the calculation unit 52 and the determination result of the presence or absence of an abnormality can be transmitted to the mobile communication terminal 13, and various requests from the mobile communication terminal 13 can be received. The interface 54 is not limited to the above configuration, and for example, 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 can be adopted. Further, the external device is not limited to the mobile communication terminal 13 described above, and may be, for example, a management server connected to a network line or the like.

In addition to the above-described configuration, the monitoring device 50 according to the present 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 an inverter device 31A including an inverter circuit formed on the inverter board 31 and a capacitor 35 mounted on the inverter board 31. The driving state including the operating frequency of the electric motor 11 is specified. Then, the monitoring device 50 can perform frequency analysis based on the operating frequency of the motor 1 by using the drive state information of the motor 11 acquired by the drive state acquisition unit 55 when the frequency analysis is performed by the calculation unit 52. It is possible and realizes high analysis accuracy.

With the above-described 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 has occurred in the pump device 1 are acquired a plurality of times. Then, the calculation unit 52 executes frequency analysis based on the detection result and the electric motor information and the pump information stored in the storage unit 52, and at various timings when no abnormality has occurred in the pump device 1. The analysis results are learned and stored (for example, using a well-known machine learning method). Then, the pump device 1 is normally operated, the detection results of the vibration sensor 37 are sequentially acquired, and the calculation unit 52 performs frequency analysis in the same manner. Then, the presence or absence of the occurrence of the abnormality is specified by specifying the change by comparing the result of the frequency analysis with the analysis result when the abnormality has not occurred in the pump device 1 stored in advance.

FIG. 6 is a diagram showing an example of a frequency analysis result of the vibration sensor according to the embodiment of the present invention. In FIG. 6, the graph of the analysis result indicated by the reference numeral D1 is an analysis result stored in the storage unit 53 in advance at an arbitrary timing when no abnormality has occurred in the pump device 1, and is an analysis indicated by the reference numeral D2. The graph of the result is an analysis result at the same timing when an abnormality has occurred in the pump device 1. In the example of FIG. 6, it can be understood that the distribution of the vibration (amplitude) level at each frequency in the graphs of both analysis results D1 and D2 is relatively laterally shifted. 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.

Further, FIG. 7 is a diagram showing another example of the frequency analysis result of the vibration sensor according to the embodiment of the present invention. In FIG. 7, the graph of the analysis result indicated by reference numeral D3 is stored in the storage unit 53 in advance at an arbitrary timing (different from the timing shown in FIG. 6) when no abnormality has occurred in the pump device 1. The graph of the analysis result shown by reference numeral D4 is the analysis result, and is the analysis result at the same timing when the pump device 1 has an abnormality. In the example of FIG. 7, it can be understood that the vibration level of the analysis result D4 is higher than that of the analysis result D3 at a specific frequency. The calculation unit 52 can identify that an abnormality has occurred in the pump device 1 by also specifying such a change in the analysis result. Then, by transmitting the specific result in the calculation unit 52 or the analysis result shown in FIG. 6 or 7 to the mobile communication terminal 13 using the interface 54, the user or the like who manages the pump device 1 is notified of the occurrence of an abnormality. It becomes possible.

The method for identifying the abnormality based on the detection result of the vibration sensor 37 is not limited to the above-mentioned method. For example, when the level of vibration detected by the vibration sensor 37 becomes larger than a preset threshold value based on pump information, motor information, or the like, it can be specified that an abnormality has occurred. The vibration level may be an overall value (OA value) as a result of frequency analysis of the measured vibration data, or may be a vibration level of a preset frequency. Further, in addition to identifying the abnormality by the above-mentioned method, the abnormality occurred by taking into consideration the frequency analysis result of the vibration sensor, the operating frequency of the inverter, the pump information and the motor information stored in the storage unit 53, and the like. The location can also be specified or estimated.

By the way, the vibration sensor 37 according to the present embodiment can accurately detect the vibration generated in the pump device 1 as described above, but the detection result is not always suitable for monitoring an abnormality. No. More specifically, during acceleration or deceleration of the motor 11, transient vibration is likely to occur in the pump device 1, and since the rotation frequency of the motor 11 fluctuates during acceleration and deceleration, the vibration at this time. The detection result of the sensor 37 is not very appropriate as data for determining the presence or absence of an abnormality. Therefore, the monitoring device 50 in the present embodiment further identifies whether the motor 11 is in the acceleration / deceleration state or the steady state from the drive state acquired by the drive state acquisition unit 55, and the motor 11 is in a steady state. Vibration detection by the vibration sensor 37 is performed only in the steady state. By controlling the vibration detection timing in this way, the monitoring device 50 can always realize highly accurate abnormality monitoring.

Further, when the monitoring device 50 is provided on the inverter board 31 as in the present embodiment, it is possible to realize the entire series of monitoring processes on the inverter board 31, and the motor independently realizes the abnormality monitoring function. Can be provided. In particular, since the inverter board 31 has not only variable speed control but also an abnormality detection function using vibration, it is difficult to execute the means when a means for detecting an abnormality is prepared separately from the pump device 1. Further, it is particularly advantageous in that control such that abnormality detection is performed only when the electric motor 11 is in a specific driving state can be easily realized. However, the monitoring device 50 does not necessarily have to be provided on the inverter board 31, and may be arranged at a predetermined position in the inverter case 32, or the main function of the monitoring device 50 is mounted on the mobile communication terminal 13. The inverter board 31 may be provided with only a communication function for transmitting the detection result of the vibration sensor 37, the driving state of the electric motor 11, and the like.

As described above, if the above-mentioned monitoring device 50 is adopted for the electric motor 11 or the like of the pump device 1, it is possible to monitor the abnormality of the pump device 1 using the detection result 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 gist of the present invention. And all of them are included in the technical idea of the present invention.

1 Pump device 10 Pump 11 Inverter built-in type motor 12 Coupling 13 Portable communication terminal 21 Drive shaft 22 Motor body 23 Inverter section 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 Condenser 36 Power transformer 37 Vibration sensor 38 Electronic parts 39 Screw holes 40 Screws 41 Power module 42 Resin 50 Monitoring device 51 Detection result acquisition unit 52 Calculation unit 53 Storage unit 54 Interface 55 Drive state acquisition unit

Claims (10)

With a pump;
With the motor connected to the pump by the drive shaft;
With an inverter case fixed along the axial direction of the drive shaft to the end of the motor on the opposite load side;
With an inverter board fixed in the inverter case that controls the variable speed of the motor;
With a vibration sensor mounted on the inverter board;
Pump device. The inverter board is fixed to the inner surface of the inverter case using a plurality of screws, and the vibration sensor is mounted at a position adjacent to any of the plurality of screws.
The pump device according to claim 1. 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.
The pump device according to claim 1. The inverter board in the inverter case is fixed by a resin filled in at least a part of the inverter case.
The pump device according to any one of claims 1 to 3. The inverter board is fixed in the inverter case perpendicular to the drive shaft connected to the pump of the motor.
The pump device according to any one of claims 1 to 4. A monitoring device for monitoring the state of the pump device based on the output value of the vibration sensor is further provided.
The monitoring device includes a storage unit that stores motor information related to the electric motor and pump information related to the pump, and is based on each information stored in the storage unit and an output value of the vibration sensor of the pump device. Monitor the status,
The pump device according to any one of claims 1 to 5. The monitoring device further includes a drive state acquisition unit that acquires the drive state of the motor by the inverter board, and acquires each information stored in the storage unit, the output value of the vibration sensor, and the drive state acquisition unit. The state of the pump device is monitored based on the drive state information of the electric motor.
The pump device according to claim 6. 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 a steady state.
The pump device according to claim 7. The monitoring device is provided on the inverter board.
The pump device according to any one of claims 6 to 8. An electric motor for driving a pump
With the drive shaft connected to the rotating shaft of the pump;
With the motor body that drives the drive shaft;
With an inverter case fixed along the axial direction of the drive shaft to the end of the motor body on the opposite load side;
With an inverter board fixed in the inverter case that controls the variable speed of the motor body;
With a vibration sensor mounted on the inverter board;
Electric motor.

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