KR20100033925A - Electromotion actuator - Google Patents

Abstract

PURPOSE: An electric actuator is provided to predict the risk of damage due to the infiltration of rainwater or changes in posture. CONSTITUTION: An electric actuator(100) comprises a tilt angle sensor(11) installed in a casing(12) to measure the tilt angle of the actuator, and a transmission unit transmitting information about the installation posture of the actuator to an external device. The installation posture information is obtained from the tilt angle measured by the tilt angle sensor. The electric actuator also includes a normal installation posture storage unit and a current installation posture recording unit.

Description

Electric Actuator {ELECTROMOTION ACTUATOR}

The present invention relates to an electric actuator in which an electric motor for driving a valve is accommodated in a casing.

BACKGROUND ART Conventionally, electric actuators have been used to open and close rotary valves and linear valves used in air conditioners, plants, and the like. BACKGROUND ART An electric actuator of this kind usually houses various electric components and mechanical parts such as an electric motor and a deceleration mechanism in one casing, and protrudes an output shaft from the casing in which the various electric parts and mechanical parts are accommodated. The casing is also provided with a conduit for drawing in a wire connected to an external power source or a signal line for outputting a valve opening degree signal.

Moreover, this kind of electric actuator is attached to the valve in which the valve body was installed, and is integrated as an electric control valve. In this case, the output shaft of the electric actuator and the valve shaft of the valve body (the shaft rotatably supporting the valve body) are connected through the joint. In addition, the casing of the electric actuator is screwed to the valve.

In addition, in this type of electric actuator, in the case of becoming an electric regulating valve integrally with the valve, a waterproof structure such as preventing rainwater or the like from entering the casing is adopted in consideration of being installed outdoors. For example, an electric actuator is attached to the upper side of the valve, and rainwater or the like is considered to come down from the upper side of the casing, that is, it is assumed that rainwater is received from the upper surface of the casing, so that an opening is not formed in the upper surface of the casing. The structure is employ | adopted (for example, refer patent document 1).

[Patent Document 1] Japanese Utility Model Publication No. 2-25785

[Patent Document 2] Japanese Patent Application Laid-Open No. 2000-337551

[Patent Document 3] Japanese Unexamined Patent Application Publication No. 10-61809

[Patent Document 4] Japanese Patent Application Laid-Open No. 8-285131

[Patent Document 5] Japanese Patent Application Laid-Open No. 5-172571

[Patent Document 6] Japanese Unexamined Patent Publication No. 2003-287421

[Patent Document 7] Japanese Unexamined Patent Application Publication No. 8-334327

[Patent Document 8] Japanese Patent Application Laid-Open No. 2000-97695

[Patent Document 9] Japanese Patent Application Laid-Open No. 7-35548

However, in the field where the above-mentioned electric control valve is provided, it may be necessary to attach an electric actuator below the valve due to the height of the pipe to which the electric control valve is attached or the space. In this case, the lower surface of the casing faces upward and rainwater is received from the lower surface of the casing facing upward. Rainwater enters the casing through the gap between the output shaft and the casing, the gap between the conduit and the electric wire, It will deteriorate.

In addition, even in a site where the electric control valve is attached in a steady state, in a site where the influence of vibration (vibration from the outside and the vibration of the fluid flowing through the valve) is large, the screw that secures the casing is loosened due to the vibration and the electric actuator is attached. The posture changes from the initial state. If this state is left, bending stress is generated on the output shaft and the valve shaft of the electric actuator, and it is easy to cause an obstacle such as deformation or damage.

In the prior art, attention was not paid particularly to the attachment posture of the electric actuator, and when the maintenance worker who went to the site when the electric actuator became a malfunction was found to know that the cause of the malfunction was an abnormality of the attachment of the electric actuator.

Moreover, in patent document 2, the humidity sensor is installed in a casing, and it is made to detect the intrusion of water into a casing. In this case, when water invades the casing and the temperature in the casing rises, the inside of the casing is in a high temperature and high humidity state. This high temperature and high humidity state is detected by a humidity sensor, and it is judged that water invades in a casing. However, in this method, it is possible to detect that rainwater has invaded the casing, but it is not known in advance that rainwater may invade. In addition, intrusion of rainwater into the casing cannot be detected until the casing becomes hot and humid. In addition, no countermeasures against obstacles caused by changes in the attachment posture of the electric actuator have been taken at all.

In addition to Patent Document 2, there are electric actuators that take measures against water in the casing (see, for example, Patent Documents 3 and 4), but these electric actuators all take measures against condensation occurring inside the casing. If rainwater invades from the outside, it cannot cope. In addition, as in Reference Document 2, no countermeasure against obstacles caused by a change in the attachment posture of the electric actuator is also taken.

This invention is made | formed in order to solve such a subject, The objective is that the train which knows in advance that the obstacle may arise by the invasion of rainwater and the change of an attachment posture, and is able to take countermeasures early It is to provide an actuator.

In order to achieve the above object, the present invention provides an electric actuator for storing an electric motor for driving a valve in a casing, the inclination angle sensor installed in the casing to measure the inclination angle of the electric actuator and the inclination angle measured by the inclination angle sensor. It is provided with transmission means for transmitting information about the attachment posture of the electric actuator to an external device.

According to the present invention, the inclination angle of the electric actuator is measured by the inclination angle sensor provided in the casing, and information about the attachment posture of the electric actuator obtained from the inclination angle is transmitted to the external device. For example, in the present invention, the inclination angle measured by the inclination angle sensor is transmitted to the external device as information on the attachment posture of the electric actuator. In this case, the maintenance staff knows the attachment posture of the electric actuator from the inclination angle sent, and can judge that rainwater may invade when the attachment posture of the electric actuator is upside down, and if there is a large change in the attachment posture of the electric actuator, the output shaft However, it can be judged that the valve shaft may be deformed or broken.

In the present invention, the information on the attachment posture of the electric actuator obtained from the inclination angle measured by the inclination angle sensor is not limited to the inclination angle measured by the inclination angle sensor. For example, a current attachment posture storing means for storing information on a normal attachment posture of an electric actuator as a normal attachment posture, and a current attachment posture of creating information about the current attachment posture of an electric actuator from an inclination angle measured by an inclination angle sensor. Attachment posture creation means and attachment posture determination means for comparing the normal attachment posture with the current attachment posture to determine the normal / abnormality of the current attachment posture of the electric actuator are provided, and the determination result of the attachment posture determination means is determined. The information on the attachment posture may be transmitted to an external device.

Further, an initial attachment posture storage means for storing information about the initial attachment posture of the electric actuator as the initial attachment posture, and information about the current attachment posture of the electric actuator as the current attachment posture from the inclination angle measured by the inclination angle sensor An attachment posture determination means for comparing the current attachment posture and the current attachment posture with the current attachment posture creation means and determining the normal / abnormality of the current attachment posture of the electric actuator is provided, and the determination result in the attachment posture determination means is determined by the electric actuator. The information may be transmitted to an external device as information regarding the attachment posture of the device.

In addition, a current attachment posture storing means for storing information on a normal attachment posture of the electric actuator as a normal attachment posture, and a current attachment posture of creating information about the current attachment posture of the electric actuator from the inclination angle measured by the inclination angle sensor The attachment posture shifting means and the attachment posture shifting amount calculating means for calculating the shifting amount of the attachment posture of the electric actuator based on the difference between the normal attachment posture and the current attachment posture are provided, and the shift calculated by the attachment posture shifting amount calculation means The amount may be transmitted to the external device as information on the attachment posture of the electric actuator.

Further, an initial attachment posture storage means for storing information about the initial attachment posture of the electric actuator as the initial attachment posture, and information about the current attachment posture of the electric actuator as the current attachment posture from the inclination angle measured by the inclination angle sensor A mounting posture shift amount calculating means for calculating a shift amount of the mounting posture of the electric actuator based on the difference between the current attachment posture creating means and the initial attachment posture and the current attachment posture, and calculated by the attachment posture shift amount calculating means. The shift amount may be transmitted to the external device as information on the attachment posture of the electric actuator.

In addition, a current attachment posture storing means for storing information on a normal attachment posture of the electric actuator as a normal attachment posture, and a current attachment posture of creating information about the current attachment posture of the electric actuator from the inclination angle measured by the inclination angle sensor The threshold of the normal range of the attachment posture shifting means, the attachment posture shifting amount calculating means for calculating the shifting amount of the attachment posture of the electric actuator based on the difference between the normal attachment posture and the current attachment posture, and the attachment posture of the electric actuator The normal range threshold value of the electric actuator is compared with the normal range threshold value storing means for storing the value as the normal range threshold value and the deviation amount of the attachment posture calculated by the attachment posture shift amount calculating means and the normal range threshold value. Attaching posture determination means for determining abnormality, The determination result in the determination means as the information about the attachment positions of the electric actuator may be transmitted to an external device.

Further, an initial attachment posture storage means for storing information about the initial attachment posture of the electric actuator as the initial attachment posture, and information about the current attachment posture of the electric actuator as the current attachment posture from the inclination angle measured by the inclination angle sensor In the normal range of the deviation amount of the attachment posture shifting means for calculating the shift amount of the attachment posture of the electric actuator based on the difference between the present attachment posture creation means, the initial attachment posture and the current attachment posture, and the attachment posture of the electric actuator The normal range threshold value of the electric actuator is compared with the normal range threshold value storing means for storing the threshold value as the normal range threshold value, and the deviation amount of the attachment posture calculated by the attachment posture shift amount calculation means and the normal range threshold value. Mounting posture determining means for determining abnormality The determination result in information means as information on the attachment position of the electric actuator may be transmitted to an external device.

According to the present invention, the inclination angle of the electric actuator is measured by the inclination angle sensor provided in the casing, and the information on the attachment posture of the electric actuator obtained from the inclination angle is transmitted to the external device. It is possible to know in advance that there is a possibility of a failure caused by the intrusion of rainwater or the change in the attachment posture, and the countermeasures can be taken early.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail based on drawing. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the principal part of one Embodiment of the electric actuator concerning this invention. In FIG. 1, 100 is an electric actuator which concerns on this invention, is attached to the valve 200 with a valve body, and is integrated as an electric control valve. In addition, information is exchanged with the external controller 300.

The electric actuator 100 includes a control circuit 1, a nonvolatile memory 2, an A / D converter 3, a communication circuit 4, a multiplexer 5, and a setting input circuit 6. And an electric motor 7, a motor drive circuit 8, a feedback circuit 9, a deceleration mechanism 10, and an inclination angle sensor 11, which are housed in a casing 12. . The casing 12 is screwed to the valve 200.

In this electric actuator 100, the inclination angle sensor 11 measures the inclination angle θx in the X-axis direction, the inclination angle θy in the Y-axis direction, and the inclination angle θz in the Z-axis direction of the electric actuator 100, and this is inclined angle θ ( θx, θy, θz) to the control circuit 1. In addition, since the inclination-angle sensor is already known (for example, refer patent documents 5-9), the description here is abbreviate | omitted.

The control circuit 1 includes a central processing unit (CPU) and performs processing according to a program stored in the nonvolatile memory 2. In addition to the opening degree control program for controlling the opening degree of the valve body in the valve 200, the nonvolatile memory 2 stores a normal / abnormal determination program of the attachment posture of the electric actuator as a program specific to this embodiment. It is.

In addition, in the nonvolatile memory 2, in the processing operation of the control circuit (CPU) 1 according to the above-described normal / abnormal determination program of the attachment posture, the threshold value α1 (α1x, α1y, α1z) and α2 (α2x, α2y, α2z) are stored. Thresholds α1 and α2 will be described later.

The non-volatile memory 2 also stores a normal attachment posture and an initial attachment posture to the valve 200 of the electric actuator 100.

In this embodiment, as the normal attachment posture to the valve 200 of the electric actuator 100, the attachment posture in the X-axis direction determined in design is determined by attaching the electric actuator 100 above the valve 200. ), The attachment posture [theta] ync in the Y-axis direction, and the attachment posture [theta] znc in the Z-axis direction are stored in the nonvolatile memory 2.

In addition, as an initial attachment posture to the valve 200 of the electric actuator 100, the attachment posture ((theta) xst) of the electric actuator 100 before starting operation by attaching the electric actuator 100 to the valve 200, Y The attachment posture θyst in the axial direction and the attachment posture θzst in the Z-axis direction are stored in the nonvolatile memory 2.

(Control of valve opening)

As a normal process, the control circuit (CPU) 1 controls the opening degree of the valve body in the valve 200 in accordance with the opening degree control program stored in the nonvolatile memory 2. The opening degree control of this valve body is performed as follows.

In the control circuit (CPU) 1, the set value of the valve opening degree (setting opening degree) from the external controller 300 is set by the path of the setting input circuit 6 → multiplexer 5 → A / D converter 3. The actual measured value (actual opening degree) of the valve opening degree from the feedback circuit 9 is given to the path of the multiplexer 5 → A / D converter 3.

The control circuit (CPU) 1 compares the setting opening degree from the A / D converter 3 with the actual opening degree, and sends a drive command to the motor drive circuit 8 so that the setting opening degree and the actual opening degree coincide. . Thereby, the electric motor 7 is driven, the driving force of this electric motor 7 is transmitted to the valve shaft of the valve 200 via the reduction mechanism 10, and the valve body rotatably supported by this valve shaft. The opening degree of is adjusted.

[Self-diagnosis]

When the power supply (CPU) 1 is turned on (FIG. 2: step S101), the control circuit (CPU) 1 performs self-diagnosis (step S102) to determine normal / abnormality with respect to the processing function in the electric actuator 100 ( Step S103). If the result of the self-diagnosis is "abnormal" (NO in step S103), the system is stopped (step S104), and the result of the self-diagnosis is transmitted to the external controller 300 via the communication circuit 4 (step S105).

[Judgement of normal / abnormality of attachment posture of electric actuator]

If the result of the self-diagnosis is normal (YES in step S103), the control circuit (CPU) 1 attaches the inclination angles θ (θx, θy, θz) from the inclination angle sensor 11 to the current attachment of the electric actuator 100. It accepts as a posture (step S106).

Then, the difference (absolute value) between the inclination angle θx and the normal attachment posture (θxnc) in the X-axis direction is obtained as the deviation amount δ1x, and the difference (absolute value) between the inclination angle θy and the normal attachment posture (θync) in the Y-axis direction is obtained. It is calculated as δ1y, and the difference (absolute value) between the inclination angle θz and the normal attachment posture θznc in the Z-axis direction is obtained as the shift amount δ1z (step S107).

Then, the shift amount δ1x is compared with the threshold value α1x, the shift amount δ1y is compared with the threshold value α1y, and the shift amount δ1z is compared with the threshold value α1z. If? 1z is exceeded, the flag F1 is set to F1 = 1 (step S108). That is, the shift amount δ1 of the attachment posture of the electric actuator 100 from the normal attachment posture and the threshold value α1 in the normal range determined for the shift amount are compared, and the shift amount δ1 exceeds the threshold value α1 in the normal range. If so, it is determined to be abnormal and the flag F1 is set to "1".

Next, the control circuit (CPU) 1 obtains the difference (absolute value) between the inclination angle θx and the initial attachment posture θxst in the X-axis direction as the shift amount δ2x, and the initial attachment posture in the inclination angle θy and the Y-axis direction ( The difference (absolute value) from θyst is determined as the shift amount δ2y, and the difference (absolute value) between the inclination angle θz and the initial attachment posture θzst in the Z-axis direction is calculated as the shift amount δ2z (step S109).

Then, the shift amount δ2x and the threshold value α2x are compared, the shift amount δ2y and the threshold value α2y are compared, and the shift amount δ2z and the threshold value α2z are compared. If? 2z is exceeded, the flag F2 is set to F2 = 1 (step S110). That is, the shift amount δ2 of the attachment posture of the electric actuator 100 from the initial attachment posture is compared with the threshold value α2 in the normal range determined for the deviation amount, and the shift amount δ2 exceeds the threshold value α2 in the normal range. If so, it is determined to be abnormal and the flag F2 is set to "1".

In this way, the control circuit (CPU) 1 determines the inclination angles θ (θx, θy, θz), the shift amounts δ1 (δ1x, δ1y, δ1z), the shift amounts δ2 (δ2x, δ2x, δ2y, δ2z), and the flags F1, F2. After the determination, the information is transmitted to the external controller 300 via the communication circuit 4 (step S111).

In addition, the control circuit (CPU) 1 checks the flags F1 and F2, and stops the system if any of the flags F1 and F2 is "1" (YES in step S112) (step S114). If both of the flags F1 and F2 are not "1" (NO in step S112), the inclination angles θ (θx, θy, θz) obtained in step S106 are stored in the nonvolatile memory 2 (step S113), and the process returns to step S106. Goes.

The external controller 300 includes the inclination angles θ (θx, θy, θz) from the electric actuator 100, the shift amount δ1 (δ1x, δ1y, δ1z), the shift amount δ2 (δ2x, δ2y, δ2z), flags F1, and F2. Is received and the information is displayed on a display or the like. From the information displayed on this display, the maintenance staff is informed of the current attachment posture of the electric actuator 100, the amount of deviation from the normal attachment posture of the current attachment posture, the amount of deviation from the initial attachment posture of the current attachment posture, and the current. It is possible to know the normal / abnormality of the attachment posture of the normal attachment posture and the normal / abnormality of the initial attachment posture of the current attachment posture.

For example, when the electric actuator 100 is attached in reverse to the normal attachment posture, the flag F1 becomes "1". From the state of this flag F1, a maintenance worker knows in advance that rainwater may invade the electric actuator 100, and can take countermeasures early.

In addition, when the screw which fixes the casing 12 is loosened by vibration, and the attachment posture of the electric actuator 100 changes from an initial state, and exceeds the normal range, the flag F2 becomes "1". From the state of this flag F2, the maintenance staff advances that a bending stress may generate | occur | produce in the output shaft of the electric actuator 100, or the valve shaft in the valve 200, and may cause the failure, such as a deformation | transformation and a damage. We know and can take measures early.

In this way, according to the present embodiment, there is no stop caused by an accidental failure of the actuator, and the operability of the system is improved. In addition, in this embodiment, since the history of the inclination angle θ is stored in the nonvolatile memory 2 (FIG. 2: step S113), a useful failure analysis can be performed by examining the history of the inclination angle θ.

In this embodiment, the inclination angles θ (θx, θy, θz), the shift amount δ1 (δ1x, δ1y, δ1z), the shift amount δ2 (δ2x, δ2y, δ2z) from the electric actuator 100 to the external controller 300. , Flags F1 and F2 are sent, but it is not necessary to send all of this information.

For example, only the inclination angles θ (θx, θy, θz) may be sent. In this case, the maintenance staff knows the attachment posture of the electric actuator 100 from the inclination angles θ (θx, θy, θz) sent, and judges that rainwater may invade when the attachment posture of the electric actuator 100 is upside down. If there is a large change in the attachment posture of the electric actuator 100, it can be determined that the output shaft or the valve shaft may be deformed or broken.

Further, only the shift amount δ1 (δ1x, δ1y, δ1z) may be sent. In this case, the maintenance staff knows the deviation amount with respect to the normal attachment posture of the current attachment posture of the electric actuator 100 from the deviation δ1 (δ1x, δ1y, δ1z) sent, and the attachment posture of the electric actuator 100 is changed. It can be judged whether it is in the abnormal range or the normal range in which rainwater may invade.

It is also possible to send only the shift amount δ2 (δ2x, δ2y, δ2z). In this case, the maintenance staff knows the shift amount (variation amount) from the initial attachment posture of the current attachment posture of the electric actuator 100 from the shift amount δ2 (δ2x, δ2y, δ2z) sent, and the shift of the electric actuator 100 It is possible to judge whether the attachment posture is in an abnormal range or in a normal range in which the output shaft or the valve shaft may be deformed or damaged.

The functional block diagram of the principal part of the control circuit 1 and the nonvolatile memory 2 in the electric actuator 100 mentioned above in FIG. 3 is shown. The control circuit 1 is equipped with 1 A of attachment posture preparation part 1A, the attachment posture shift | offset amount calculation part 1B, and the attachment posture abnormality determination part 1C. The nonvolatile memory 2 includes a normal attachment posture storage unit 2A, an initial attachment posture storage unit 2B, and an attachment posture shift amount normal range threshold value storage unit 2C.

In the nonvolatile memory 2, the normal attachment posture storage unit 2A includes the normal attachment posture (θxnc) in the X-axis direction of the electric actuator 100, the normal attachment posture (θync) in the Y-axis direction, and the Z-axis direction. The normal attachment posture [theta] znc of is stored. The initial attachment posture storage unit 2B stores the initial attachment posture θxst in the X-axis direction, the initial attachment posture θyst in the Y-axis direction, and the initial attachment posture θzst in the Z-axis direction of the electric actuator 100. It is. In the attachment posture shift amount normal range threshold value storage unit 2C, the threshold α1 of the normal range of the shift amount from the normal attachment posture of the attachment posture of the electric actuator 100 and the normal range of the shift amount from the initial attachment posture Threshold α2 is preserved.

In the control circuit 1, the current attachment posture preparation unit 1A sets the inclination angles θ (θx, θy, θz) from the inclination angle sensor 11 as the current attachment posture of the electric actuator 100. The attachment posture shift amount calculating section 1B includes the current attachment posture θ (θx, θy, θz) from the current attachment posture creation unit 1A and the normal attachment posture θnc (in the normal attachment posture storage unit 2A). The difference (absolute value) between θxnc, θync, and θznc is obtained as the shift amount δ1 (δ1x, δ1y, δ1z), and the current attachment posture θ (θx, θy, θz) and initial stage from the current attachment posture preparation unit 1A. The difference (absolute value) from the initial attachment posture θst (θxst, θyst, θzst) in the attachment posture storage unit 2B is obtained as the shift amount δ2 (δ2x, δ2y, δ2z).

The attachment posture abnormality determination unit 1C is a normal range in the deviation amount δ1 (δ1x, δ1y, δ1z) and the attachment posture deviation amount normal range threshold value storage unit 2C obtained from the attachment posture shift amount calculation unit 1B. The threshold value α1 is compared, and it is determined that the deviation of the attachment posture is abnormal when the shift amount δ1 (δ1x, δ1y, δ1z) exceeds the threshold value α1 in the normal range. The deviation amount δ2 (δ2x, δ2y, δ2z) determined by the attachment posture shift amount calculation unit 1B is compared with the threshold value α2 of the normal range in the attachment posture shift amount normal range threshold value storage unit 2C. When the shift amount δ2 (δ2x, δ2y, δ2z) exceeds the threshold value α2 in the normal range, it is determined that the attachment posture is abnormal.

The control circuit 1 calculates the deviation amount calculated by the current attachment posture θ (θx, θy, θz) and the attachment posture shift amount calculation unit 1B of the electric actuator 100 created by the current attachment posture preparation unit 1A. The determination result of the attachment posture in δ1 (δ1x, δ1y, δ1z), δ2 (δ2x, δ2y, δ2z), and the attachment posture abnormality determination unit 1C is transmitted to the external controller 300 via the communication line 4. This current attachment posture preparation unit 1A, attachment posture shift amount calculation unit 1B, and attachment posture abnormality determination unit 1C are realized as processing functions of the CPU in the control circuit 1.

In the functional block diagram shown in FIG. 3, the inclination angles of the inclination angles θx, θy, and θz from the inclination angle sensors 11 in the X-axis direction, the Y-axis direction, and the Z-axis direction in the current attachment posture preparation unit 1A. The combined inclination angle is used as the current attachment posture of the electric actuator 100, and the displacement amount of the attachment posture is obtained as a difference between the normal attachment posture and the initial attachment posture stored correspondingly. It is also possible to perform the normal / abnormal determination of the attachment posture from the threshold value in the normal range.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the principal part of one Embodiment of the electric actuator concerning this invention.

Fig. 2 is a flowchart for explaining the processing operation in accordance with the normal / abnormal determination program of the attachment posture in this electric actuator.

3 is a functional block diagram of main parts of a control circuit and a nonvolatile memory in the electric actuator.

<Explanation of symbols for the main parts of the drawings>

1: control circuit 2: non-volatile memory

3: A / D converter 4: communication circuit

5: multiplexer 6: setting input circuit

7: electric motor 8: motor driving circuit

9: feedback circuit 10: deceleration mechanism

11: tilt angle sensor 12: casing

100: electric actuator 200: valve

300: external controller 1A: current attachment posture creation unit

1B: Attachment position shift amount calculation unit 1C: Attachment position deviation determination unit

2A: Normal Attachment Posture Storage 2B: Initial Attachment Posture Storage

2C: attachment posture shift amount normal range threshold memory

Claims (8)

In the electric actuator which housed the electric motor for driving a valve in a casing, An inclination angle sensor installed in the casing and measuring an inclination angle of the electric actuator; Transmission means for transmitting information about the attachment posture of the electric actuator obtained from the inclination angle measured by the inclination angle sensor to an external device. Electric actuator comprising a. The method of claim 1, The transmission means, And transmitting the inclination angle measured by the inclination angle sensor to an external device as information on an attachment posture of the electric actuator. The method of claim 1, Normal attachment posture storage means for storing information on a normal attachment posture of the electric actuator as a normal attachment posture; Current attachment posture preparing means for creating information on the current attachment posture of the electric actuator as a current attachment posture from the inclination angle measured by the inclination angle sensor; Attachment posture determination means for comparing the normal attachment posture with the current attachment posture to determine normal / abnormality of the current attachment posture of the electric actuator; And, The transmission means, And the transmission result of the determination in the attachment posture determining means as information on the attachment posture of the electric actuator to an external device. The method of claim 1, Initial attachment posture storage means for storing information about an initial attachment posture of the electric actuator as an initial attachment posture, Current attachment posture preparing means for creating information on the current attachment posture of the electric actuator as a current attachment posture from the inclination angle measured by the inclination angle sensor; Attachment posture determination means for comparing the initial attachment posture and the current attachment posture to determine normal / abnormality of the current attachment posture of the electric actuator; And, The transmission means, And the transmission result of the determination in the attachment posture determining means as information on the attachment posture of the electric actuator to an external device. The method of claim 1, Normal attachment posture storage means for storing information on a normal attachment posture of the electric actuator as a normal attachment posture; Current attachment posture preparing means for creating information on the current attachment posture of the electric actuator as a current attachment posture from the inclination angle measured by the inclination angle sensor; Attachment posture shift amount calculating means for calculating a shift amount of the attachment posture of the electric actuator based on the difference between the normal attachment posture and the current attachment posture; And, The transmission means, An electric actuator, characterized in that for transmitting the deviation amount calculated by the attachment posture shift amount calculating means to the external device as information on the attachment posture of the electric actuator. The method of claim 1, Initial attachment posture storage means for storing information about an initial attachment posture of the electric actuator as an initial attachment posture, Current attachment posture preparing means for creating information on the current attachment posture of the electric actuator as a current attachment posture from the inclination angle measured by the inclination angle sensor; Attachment posture shift amount calculating means for calculating a shift amount of the attaching posture of the electric actuator based on the difference between the initial attachment posture and the current attachment posture. And, The transmission means, An electric actuator, characterized in that for transmitting the deviation amount calculated by the attachment posture shift amount calculating means to the external device as information on the attachment posture of the electric actuator. The method of claim 1, Normal attachment posture storage means for storing information on a normal attachment posture of the electric actuator as a normal attachment posture; Current attachment posture preparing means for creating information on the current attachment posture of the electric actuator as a current attachment posture from the inclination angle measured by the inclination angle sensor; Attachment posture shift amount calculating means for calculating a shift amount of the attachment posture of the electric actuator based on the difference between the normal attachment posture and the current attachment posture; Normal range threshold storage means for storing a threshold value of the normal range of the shift amount of the attachment posture of the electric actuator as a normal range threshold value; Attachment posture determination means for comparing the deviation amount of the attachment posture calculated by the attachment posture displacement amount calculation unit with the normal range threshold value to determine the normal / abnormality of the current attachment posture of the electric actuator; And, The transmission means, And the transmission result of the determination in the attachment posture determining means as information on the attachment posture of the electric actuator to an external device. The method of claim 1, Initial attachment posture storage means for storing information about an initial attachment posture of the electric actuator as an initial attachment posture, Current attachment posture preparing means for creating information on the current attachment posture of the electric actuator as a current attachment posture from the inclination angle measured by the inclination angle sensor; Attachment posture shift amount calculating means for calculating a shift amount of the attachment posture of the electric actuator based on the difference between the initial attachment posture and the current attachment posture; Normal range threshold storage means for storing a threshold value of the normal range of the shift amount of the attachment posture of the electric actuator as a normal range threshold value; Attachment posture determination means for comparing the deviation amount of the attachment posture calculated by the attachment posture displacement amount calculation unit with the normal range threshold value to determine the normal / abnormality of the current attachment posture of the electric actuator; And, The transmission means, And the transmission result of the determination in the attachment posture determining means as information on the attachment posture of the electric actuator to an external device.

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